Littérature scientifique sur le sujet « Molding (forming) »
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Articles de revues sur le sujet "Molding (forming)"
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Czerwinski, Frank. « Selected Aspects of Semisolid Forming Magnesium Alloys ». Materials Science Forum 539-543 (mars 2007) : 1644–49. http://dx.doi.org/10.4028/www.scientific.net/msf.539-543.1644.
Texte intégralRésumé :
The conventional and novel routes of injection molding magnesium alloys are described, including thixo- and rheomolding, semisolid extrusion molding, near-liquidus molding, composite molding and alloy generation by mixing thixotropic slurries. For each technique the basic concepts along with their experimental verifications are explained. The examples show the universal nature of the injection molding and its capability of implementing a variety of modern processing methods.
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Wu, Li Ying. « Study on Form Process of Resin Composite Material and Graphic Artist Designer ». Applied Mechanics and Materials 608-609 (octobre 2014) : 41–45. http://dx.doi.org/10.4028/www.scientific.net/amm.608-609.41.
Texte intégralRésumé :
The paper analyze development process of the advanced resin matrix composite materials forming technology, that is low pressure molding, pultrusion process, molding, filament winding forming process, placement molding process, molding process of RTM, and analyze the key technology in the development process, to study the evolvement of advanced composite material molding process, so as to explore the future development direction of forming resin based composite material technology.
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Yu, Bei, et He Qing Wang. « Research on Injection Products Molding Defects Warping Based on Moldflow ». Applied Mechanics and Materials 365-366 (août 2013) : 141–44. http://dx.doi.org/10.4028/www.scientific.net/amm.365-366.141.
Texte intégralRésumé :
The molding quality of plastic injection products are affected by such factors as mold structure and molding technology in the forming process. If the products have any quality problem, every forming process will have to be reviewed, which will intangibly lead to an increase in workload for mold-related staff and in the costs of production. Based on an example of molding defects warping in the practical production of a PBT plastic injection product, this essay analyzes the molding defects by using Moldflow software, with the aim of optimizing molding scheme and the molding quality of injection products and finally improving the social and economic benefits.
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Jing, Guan. « Analysis of Influence of Fine Aggregate on Void Ratio of Asphalt Mixture ». Applied Mechanics and Materials 587-589 (juillet 2014) : 1079–83. http://dx.doi.org/10.4028/www.scientific.net/amm.587-589.1079.
Texte intégralRésumé :
Using molding with different fine aggregate, gradation, asphalt, aggregate forming and forming method, and calculate the sample porosity. The test results show that: The basalt coarse-fine aggregate molding, specimen void ratio was larger, are beyond the regulatory requirements; basalt coarse aggregate molding and limestone fine aggregate molding, specimen porosity is small, can meet the requirements of specification range. The main reason is that the basalt thin bulk density is big, and its not easy compaction.
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Yang, Jie, Yang Guan, Dongdong Gu, Yuzhong Zhang, Zheng Zhang et Jinfa Shi. « Effect of a stranded hole type on the performance of corn stover composite pipe ». PLOS ONE 19, no 4 (10 avril 2024) : e0301590. http://dx.doi.org/10.1371/journal.pone.0301590.
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To promote the comprehensive utilization of corn stover and the development of field water-saving irrigation technology, a method of returning corn stover to the field was prosed; in this method, the crop stalks were crushed, mixed with soil in different proportions of adulteration, and then extruded to form hollow round tubes. To compare the influence of the winch blade with or without a diameter change on the composite pipe molding performance, two composite pipe molding devices were theoretically designed, simulated, and analyzed using discrete element simulation software, and a composite pipe molding bench test was performed. The simulation test revealed that the composite pipe molding rate of the winch blade without the reducer molding device was 3.45 kg/s, the output power of the winch shaft was 20.7 kW, the composite pipe molding rate of the winch blade with the reducer molding device was 1.20 kg/s, and the output power of the winch shaft was 18.75 kW. By calculating the weighted average of two indices, the composite pipe forming rate and the winch shaft output power, the comprehensive performance index of the composite pipe forming device without a reducer was greater than that of the device with a reducer. The composite pipe forming bench test revealed two kinds of molding devices with an extrusion molding with an outer diameter of 100 mm and an inner diameter of 30 mm. The composite pipe density test average was greater than 1.30 g/cm3 and met the requirements of composite pipe molding; the winch blade without a reducer molding device had an average composite pipe molding rate of 3.23 kg/s, and the winch blade with an average reducer molding rate of 2.07 kg/s. The forming rate of the composite pipe without a reducer was faster. Therefore, a winch blade without a reducer composite pipe molding device is more conducive to improving the composite pipe molding performance.
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Chaisrichawla, Suradej, et Rapeephun Dangtungee. « The Usage of Recycled Material in Rotational Molding Process for Production of Septic Tank ». Materials Science Forum 936 (octobre 2018) : 151–58. http://dx.doi.org/10.4028/www.scientific.net/msf.936.151.
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Rotational molding is the forming process that use in produce large product, complexity product and hollow product with the limitation of process ability and material. Most of the rotational molding is a large product with a longer useful life compare to other technique, so to reused the material from other process can help to increase the competition of rotational molding in the market. This paper chooses recycled HDPE from blowing process due to it generally used by the market and not difficult to find. So in this paper choose to studies the blend of virgin LLDPE (linear low density polyethylene) and recycled HDPE (high density polyethylene) for application in septic tank by rotational molding process. Various ratio of blending were investigated to find the morphology, mechanical properties and the relation of melt flow rate and rheology. Mechanical properties are generally referred to tensile test, hardness test, impact strength and Morphology by Scanning Electron Microscope. Many studies have carried out to investigate about rotational molding forming process control, mold and process condition, some on material ability and new material to used in rotational molding to improve the mechanical properties and various technique in forming by rotational molding. But this article will investigated more about the use of recycled material from other forming technique process (which refer to blowing process in this article) to use in rotational molding process for produce septic tank compare to the commercial quality.
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Chen, Yuan-Yang, et Yung-Jin Weng. « A Novel Continuous Roll-Forming Process of Elastomer Molds ». Processes 11, no 3 (18 mars 2023) : 931. http://dx.doi.org/10.3390/pr11030931.
Texte intégralRésumé :
This study proposed a novel continuous roll-forming process of elastomer molds, which can control the deformation of the mold using the rolling belt stack combination method. This study analyzed various rolling belt combinations, assembled the system based on simulation and experimental data according to the deformation requirement design, and obtained a controllable microstructure mold rolling belt with tensile deformation. Mold thickness and microstructure size are key microstructure mold deformation parameters. This study designed and assembled a controllable microstructure mold rolling belt-type imprint molding system and conducted a series of experiments. The impact and application of different experimental system operation procedures and fabrication methods of the auxetic structure rolling belt on replication molding were analyzed. The innovative controllable microstructure mold rolling belt-type imprint replication molding technique proposed in this study had a stable and controllable mold deformation mechanism. It can control and replicate molding.
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Li, Zhen, Li Xia Xu, Chun Lan Lu, Guo Zhu Liu et Xin Yue Li. « Internal Structure Changes of Nylon 12 in Balloon Forming Process ». Applied Mechanics and Materials 528 (février 2014) : 153–61. http://dx.doi.org/10.4028/www.scientific.net/amm.528.153.
Texte intégralRésumé :
Medical balloon has been widely used for the treatment of cardiovascular and cerebrovascular diseases, but the theoretical studies in processing process of medical balloon have reported less in the domestic. This paper briefly introduce in the processing process of medical balloon from the nylon 12 as raw materials, through control the conditions of primary molding, secondary molding and final molding process of the operating, then investigate the stress-strain curve of each sample in the molding process by Hydraulic Pressure Tester. And further investigated the material's lattice parameter, melting point, crystallinity and the structure changes of internal groups during the molding process separately by X-ray diffraction (XRD), differential scanning caborimetry (DSC) and infrared transmission spectroscopy (FTIR) experiment. It could be founded that the acting force between the polymeric chain of nylon 12 reduced at first, so that the material has better plasticity and machinability for forming, and then the acting force of polymer chain is enhanced, so that the final balloon has higher strength and stability were discovered during the balloon forming process.
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Hu, Hai Ming, De Bao Yin et Hui Li. « Forming Process of Segment-Narrow-Bars on the PCR Mold ». Key Engineering Materials 561 (juillet 2013) : 270–73. http://dx.doi.org/10.4028/www.scientific.net/kem.561.270.
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The narrow bars on tire mold segment are used for molding the sipes on the tread, Its size is small.Its shape and location is diverse and process is complex. This article, through processing feasibility analysis of the narrow bars, combined with production practice, conducted a systematic and detailed explanations on the process of molding the narrow bars in the precision casting method for molding segment.Through analyse a number of empirical conclusions about narrow bars’ forming process which have drawn, and has proved the practicality of these methods through practice.
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Yanjun, Xiao, Liu Rui, Song Haiping, Jing Ran et Zhu Jiayu. « The Characteristics of Perlite Sound Absorption Board Formed By Vibration Molding ». Open Materials Science Journal 9, no 1 (26 juin 2015) : 39–42. http://dx.doi.org/10.2174/1874088x01509010039.
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This paper puts forward a scheme to form perlite sound absorption boards by vibration molding according to the material properties and the characteristics of vibration forming method. In the trial, the feasibility and reliability of this method were confirmed by studying the effect of working pressure, frequency and vibration force on the quality of the perlite sound absorption board. Besides, a series of recommended parameters for better forming was proposed. Through the discussion on the characteristics of the perlite sound absorption board after vibration molding, it is verified that different molding methods have a great influence on the quality and performance of the perlite sound absorption board. In addition, the conclusion which provides a basis for further research on forming method of similar boards shows that the density of the finished products formed by vibration molding method is more uniform.
Thèses sur le sujet "Molding (forming)"
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Reddy, Mahender Palvai. « Finite element simulation of three-dimensional casting, extrusion and forming processes ». Diss., This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-07282008-135311/.
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Su, Lijuan. « EXPERIMENTAL AND NUMERICAL ANALYSIS OF THERMAL FORMING PROCESSES FOR PRECISION OPTICS ». The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1288024081.
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Young, Robert Thomas. « Processing Behavior of Thermoplastics Reinforced with Melt Processable Glasses ». Diss., Virginia Tech, 1999. http://hdl.handle.net/10919/37490.
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This work was concerned with evaluating the behavior of thermoplastics reinforced with melt processable phosphate glasses processed by techniques including injection molding, compression molding, and thermoforming. Thermoplastic resins consisting of polyphenylene sulfide (PPS), polyetherimide (PEI) and polyetheretherketone (PEEK) were combined with phosphate glasses having glass transition temperatures (Tg) that ranged from 230-290°C to form composite systems where both the matrix and reinforcing phase were deformable during processing.
For the process of injection molding, several factors were examined to maximize the mechanical properties obtained with the addition of the phosphate glasses. The influence of variables such as the glass and matrix viscosity, glass loading, melt temperature, and mold fill rate were examined for a variety of composite blends consisting of the PPS, PEI, and PEEK reinforced with a lower Tg (234°C) phosphate glass and PEEK blended with a higher Tg (282°C) glass. From this work, it was determined that the best mechanical properties were generally produced by using processing temperatures and material combinations that minimized the viscosity differences between the thermoplastic resin and phosphate glass. Variations in the material combinations and processing conditions utilized were also found to result in the formation of a variety of glass phase morphologies that consisted of droplets, ribbons, and an interpenetrating network structure.
The addition of the phosphate glass to the neat thermoplastics resins was found to be an effective way to produce injection moldable composite blends. The stiffness of the composite blends increased with glass loading with composites containing up to 45 vol% phosphate glass exhibiting machine direction tensile and flexural moduli in the range of 3-5 times greater than that those of the neat thermoplastics. Additionally, these composites were found to offer moduli and strengths that ranged from 25-50% lower than conventional E-glass fiber reinforced materials of the same loading. The lower mechanical properties of the neat phosphate glasses coupled with a lack of adhesion between the matrices and the glasses helped contribute to the lower mechanical properties exhibited by the phosphate glass reinforced composites. Still, the phosphate glass reinforced blends offered certain advantages including lower mechanical anisotropy, smoother surfaces, and lower viscosities.
The processing behavior of phosphate glass reinforced thermoplastics was also examined at temperatures commonly used in forming and shaping operations such as compression molding and thermoforming. It was determined that it was possible to deform the phosphate glass reinforcing phase along with the matrix resin at temperatures only 30-50°C above the Tg of the glass. The deformable phosphate glass reinforcing phase resulted in composite blends that exhibited greater extensibility than a solid E-glass fiber reinforced material. The elongation of the phosphate glass into a higher aspect ratio reinforcing morphology was found to result in an almost 25% increase in the tensile modulus for a polyphenylene sulfide based composite.Ph. D.
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Chen, Yang. « Thermal Forming Process for Precision Freeform Optical Mirrors and Micro Glass Optics ». The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1267477993.
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Smith, Andrew G. « The Development of a Vacuum Forming System for KYDEX® and Other Thermoplastic Sheet ». Digital Commons @ East Tennessee State University, 2017. https://dc.etsu.edu/etd/3233.
Texte intégralRésumé :
Vacuum forming is a popular, cost effective method amongst large and small scale applications. The method is used to mold a material to the surface of a mold/pattern in order to create a negative copy for reproduction or an object in positive form. The prototype vacuum forming system developed and documented herein is of a membrane-seal type that consists of three (3) principle parts: radial platen, Hinged Frame and Platen Support Assembly, and a PVC surge tank. Each part is described in detail through design, manufacturing, and testing processes. The design supports functional versatility, small scale molding, and uses readily available materials. Functional prototype testing was performed with the thermoplastic KYDEX® and multiple objects for mold examples. Results include successful proof of concept, design pros and cons, and findings based on functional testing.
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Cordier, Telmar Aurélie. « Etude de déformabilité de tresses en cours de préformage pour la fabrication de composite par le procédé RTM ». Thesis, Orléans, 2012. http://www.theses.fr/2012ORLE2045/document.
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Cette thèse traite la fabrication de pièces composites par le procédé « Resin Transert Molding » (RTM), appliquée à des tubes de protections thermiques assemblées dans des propulseurs de systèmes d’armes. Ces travaux ont pour objectif de démontrer la faisabilité d’utilisation de ce procédé pour la fabrication de ces pièces complexes. C’est le préformage, première étape du procédé de fabrication par RTM, qui est étudié dans le cadre de cette thèse. Cette étape est cruciale du point de vue de la faisabilité de l’étape d’injection qui la suit dans le procédé RTM mais aussi pour s’assurer de la qualité de la pièce composite finale obtenue. L’objectif des travaux de thèse est triple. Il faut tout d’abord développer le protocole de fabrication répétable adapté pour garantir l’obtention de préformes conformes. Ce protocole devra être viable du point de vue industriel. Pour cela, une démarche expérimentale a été mise en place. Un pilote de laboratoire puis un pilote industriel ont permis de comprendre et maitriser les phénomènes survenant en cours de préformage en faisant varier les paramètres procédé pour la fabrication de nombreux prototypes. Un modèle macroscopique prédictif de la forme globale des plis obtenus à partir des paramètres procédés a été développé à l’aide des observations expérimentales. Un modèle mésoscopique, à l’échelle de la maille élémentaire, a été écrit également. Il permet de prédire, à partir des données constitutives du matériau et d’une géométrie de pièce, la déformation de compaction et de cisaillement, modes de sollicitations prépondérants en cours de préformage, subie par le renfort en cours de la première étape du procédé de fabrication. Ces modèles mésoscopique et macroscopique couplés permettent le développement d’un outil global qui, de manière théorique et prédictive, assure la faisabilité d’une pièce de géométrie connue avec un matériau connu et fournit les paramètres « procédé » optimum pour assurer sa fabrication future. Les phénomènes de déformation en cisaillement et compaction apparaissant sur la tresse en cours de préformage sont donc identifiés et connus. Le procédé de fabrication est optimisé et l’outil prédictif permet d’envisager et tester en amont un changement de matériau, de géométrie de pièce à fabriquer ou de cahier descharges industrielThis study deals with the manufacture of composite parts by the process "Resin Transert Molding" (RTM), applied to thermal protection tubes. This work aims to demonstrate the feasibility of using this method for the production of these complex parts. This study deals with the first step of the RTM process, the fiber performing. This is critical from the standpoint of the feasibility of injecting step that follows in the RTM process but also to ensure the quality of the final composite part obtained. The aim of the thesis is threefold. Must first develop the manufacturing protocol adapted to ensure repeatable obtaining preforms compliant. This protocol should be viable to the industrial point of view. For this purpose, an experimental approach was implemented. A pilot laboratory and an industrial pilot helped to understand and master the phenomena occurring during forming varying the process parameters for the production of many prototypes. A macroscopic model predictive of overall shape folds obtained from the process parameters has been developed with the experimental observations. A mesoscopic model, the scale of the unit cell was also writing. It can predict, based on the specifications of the material and part geometry, the deformation of compaction and shear stresses. These models mesoscopic and macroscopic allow the development of a global tool that, theoretically predictive and ensures the feasibility of a piece of known geometry with a known material parameters and provides the "process" to ensure its optimum manufacturing future. The phenomena of compaction and shear strain appearing on the braid during preforming are identified and known. The manufacturing process is optimized and the predictive tool allows to explore and test upstream change of material, part geometry in manufacturing or industrial specifications
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Wendling-Hivet, Audrey. « Simulation à l'échelle mésoscopique de la mise en forme de renforts de composites tissés ». Thesis, Lyon, INSA, 2013. http://www.theses.fr/2013ISAL0079.
Texte intégralRésumé :
De nos jours, l’intégration de pièces composites dans les produits intéresse de plus en plus les industriels, particulièrement dans le domaine des transports. En effet, ces matériaux présentent de nombreux avantages, notamment celui de permettre une diminution de la masse des pièces lorsqu’ils sont correctement exploités. Pour concevoir ces pièces, plusieurs procédés peuvent être utilisés, parmi lesquels le RTM (Resin Transfer Molding) qui consiste en la mise en forme d’un renfort sec (préformage) avant une étape d’injection de résine. Cette étude concerne la première étape du procédé RTM, celle de préformage. L’objectif est de mettre en œuvre une stratégie efficace conduisant à la simulation par éléments finis de la mise en forme des renforts à l’échelle mésoscopique. A cette échelle, le renfort fibreux est modélisé par un enchevêtrement de mèches supposées homogènes. Plusieurs étapes sont alors nécessaires et donc étudiées ici pour atteindre cet objectif. La première consiste à créer un modèle géométrique 3D le plus réaliste possible des cellules élémentaires des renforts considérés. Elle est réalisée grâce à la mise en œuvre d’une stratégie itérative basée sur deux propriétés. D’une part, la cohérence, qui permet d’assurer une bonne description du contact entre les mèches, c'est-à-dire, que le modèle ne contient ni vides ni interpénétrations au niveau de la zone de contact. D’autre part, la variation de la forme des sections de la mèche le long de sa trajectoire qui permet de coller au mieux à la géométrie évolutive des mèches dans le renfort. Grâce à ce modèle et à une définition libre par l’utilisateur de l’architecture tissée, un modèle représentatif de tout type de renfort (2D, interlock) peut être obtenu. La seconde étape consiste à créer un maillage hexaédrique 3D cohérant de ces cellules élémentaires. Basé sur la géométrie obtenue à la première étape. L’outil de maillage créé permet de mailler automatiquement tout type de mèche, quelle que soit sa trajectoire et la forme de ses sections. La troisième étape à franchir consiste, à partir du comportement mécanique du matériau constitutif des fibres et de la structure de la mèche, à mettre en place une loi de comportement du matériau homogène équivalent à un matériau fibreux. Basé sur les récents développements expérimentaux et numériques en matière de loi de comportement de structures fibreuses, un nouveau modèle de comportement est présenté et implémenté. Enfin, une étude des différents paramètres intervenant dans les calculs en dynamique explicite est réalisée. Ces deux derniers points permettent à la fois de faire converger rapidement les calculs et de se rapprocher de la réalité de la déformation des renforts. L’ensemble de la chaîne de modélisation/simulation des renforts fibreux à l’échelle mésoscopique ainsi créée est validée par comparaison d’essais numériques et expérimentaux de renforts sous sollicitations simplesNowadays, manufacturers, especially in transport, are increasingly interested in integrating composite parts into their products. These materials have, indeed, many benefits, among which allowing parts mass reduction when properly operated. In order to manufacture these parts, several methods can be used, including the RTM (Resin Transfer Molding) process which consists in forming a dry reinforcement (preform) before a resin being injected. This study deals with the first stage of the RTM process, which is the preforming step. It aims to implement an efficient strategy leading to the finite element simulation of fibrous reinforcements at mesoscopic scale. At this scale, the fibrous reinforcement is modeled by an interlacement of yarns assumed to be homogeneous and continuous. Several steps are then necessary and therefore considered here to achieve this goal. The first consists in creating a 3D geometrical model of unit cells as realistic as possible. It is achieved through the implementation of an iterative strategy based on two main properties. On the one hand, consistency, which ensures a good description of the contact between the yarns, that is to say, the model does not contain spurious spaces or interpenetrations at the contact area. On the other hand, the variation of the yarn section shape along its trajectory that enables to stick as much as possible to the evolutive shape of the yarn inside the reinforcement. Using this tool and a woven architecture freely implementable by the user, a model representative of any type of reinforcement (2D, interlock) can be obtained. The second step consists in creating a 3D consistent hexahedral mesh of these unit cells. Based on the geometrical model obtained in the first step, the meshing tool enables to mesh any type of yarn, whatever its trajectory or section shape. The third step consists in establishing a constitutive equation of the homogeneous material equivalent to a fibrous material from the mechanical behavior of the constituent material of fibers and the structure of the yarn. Based on recent experimental and numerical developments in the mechanical behavior of fibrous structures, a new constitutive law is presented and implemented. Finally, a study of the different parameters involved in the dynamic/explicit scheme is performed. These last two points allow both to a quick convergence of the calculations and approach the reality of the deformation of reinforcements. The entire chain modeling/simulation of fibrous reinforcements at mesoscopic scale created is validated by numerical and experimental comparison tests of reinforcements under simple loadings
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Wendling, Audrey. « Simulation à l'échelle mésoscopique de la mise en forme de renforts de composites tissés ». Phd thesis, INSA de Lyon, 2013. http://tel.archives-ouvertes.fr/tel-00961196.
Texte intégralRésumé :
De nos jours, l'intégration de pièces composites dans les produits intéresse de plus en plus les industriels, particulièrement dans le domaine des transports. En effet, ces matériaux présentent de nombreux avantages, notamment celui de permettre une diminution de la masse des pièces lorsqu'ils sont correctement exploités. Pour concevoir ces pièces, plusieurs procédés peuvent être utilisés, parmi lesquels le RTM (Resin Transfer Molding) qui consiste en la mise en forme d'un renfort sec (préformage) avant une étape d'injection de résine. Cette étude concerne la première étape du procédé RTM, celle de préformage. L'objectif est de mettre en œuvre une stratégie efficace conduisant à la simulation par éléments finis de la mise en forme des renforts à l'échelle mésoscopique. A cette échelle, le renfort fibreux est modélisé par un enchevêtrement de mèches supposées homogènes. Plusieurs étapes sont alors nécessaires et donc étudiées ici pour atteindre cet objectif. La première consiste à créer un modèle géométrique 3D le plus réaliste possible des cellules élémentaires des renforts considérés. Elle est réalisée grâce à la mise en œuvre d'une stratégie itérative basée sur deux propriétés. D'une part, la cohérence, qui permet d'assurer une bonne description du contact entre les mèches, c'est-à-dire, que le modèle ne contient ni vides ni interpénétrations au niveau de la zone de contact. D'autre part, la variation de la forme des sections de la mèche le long de sa trajectoire qui permet de coller au mieux à la géométrie évolutive des mèches dans le renfort. Grâce à ce modèle et à une définition libre par l'utilisateur de l'architecture tissée, un modèle représentatif de tout type de renfort (2D, interlock) peut être obtenu. La seconde étape consiste à créer un maillage hexaédrique 3D cohérant de ces cellules élémentaires. Basé sur la géométrie obtenue à la première étape. L'outil de maillage créé permet de mailler automatiquement tout type de mèche, quelle que soit sa trajectoire et la forme de ses sections. La troisième étape à franchir consiste, à partir du comportement mécanique du matériau constitutif des fibres et de la structure de la mèche, à mettre en place une loi de comportement du matériau homogène équivalent à un matériau fibreux. Basé sur les récents développements expérimentaux et numériques en matière de loi de comportement de structures fibreuses, un nouveau modèle de comportement est présenté et implémenté. Enfin, une étude des différents paramètres intervenant dans les calculs en dynamique explicite est réalisée. Ces deux derniers points permettent à la fois de faire converger rapidement les calculs et de se rapprocher de la réalité de la déformation des renforts. L'ensemble de la chaîne de modélisation/simulation des renforts fibreux à l'échelle mésoscopique ainsi créée est validée par comparaison d'essais numériques et expérimentaux de renforts sous sollicitations simples.
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Sanjon, Cedric, Fabian Kayatz et Andre Schult. « Materialcharakterisierung von Kunststoffen fürs Thermoformen unter Nutzung neuer Messtechnologien ». Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-236138.
Texte intégralRésumé :
Für die Herstellung von Kunststoffformteilen, z.B. Verpackungen, Komponenten für Haushaltsgeräte, Automobil- oder Medizinbranche, werden aufgrund von Mikrostrukturen, neuen sowie hybriden Materialien und dem zunehmenden Kostendruck steigende Anforderungen an das Formteil, das Verfahren und den Prozess gestellt. Entsprechende Technologien zur Verbesserung des Umformprozesses stehen vor der Markteinführung oder werden derzeit entwickelt. Aufgrund des damit einhergehenden Anstiegs der Technologiekomplexität werden zunehmend Material- und Prozessmodelle eingesetzt. Die dienen der Technologieentwicklung, der Optimierung des Prozesses und bilden eine Hilfestellung bei der Inbetriebnahme. Ein Schwerpunkt und eine Herausforderung ist dabei die Materialmodellierung. Während des Umformens ins Werkzeug beim Thermoformen treten verschiedene Effekte auf: z. B. Dehnung und Verschiebung der Polymerketten, Bildung von amorphen und kristallinen Strukturen. Das sich daraus ergebende Verhalten ist durch geeignete Materialmodelle und deren Parametrisierung abzubilden. Ein gängiger Ansatz zur Bestimmung des Materialverhaltens und die damit verbundene Bestimmung der Materialparameter ist die Reverse-Engineering-Methode. Zu diesem Zweck stehen verschiedene Ersatzversuche zur Auswahl, z.B. Membrane-Inflation- Rheometer (MIR), Thermoformen-Material-Charakterisierung (TMC) und uniaxiale sowie biaxiale Zugversuche. Mit Hilfe geeigneter Modelle werden die Parameter entsprechend der experimentellen Daten gefittet. Für die Abbildung des Umformprozesses in einem numerischen Modell ist die Implementierung des Materialmodells in ein Prozessmodell notwendig. Um quantitative und qualitative Aussagen zur Übereinstimmung des numerischen Modells mit dem tatsächlichen Umformprozess zu erhalten, ist stets eine Validierung notwendig, indem experimentelle Simulationen durchgeführt und anhand ausgewählter Zielgrößen analysiert und den numerischen Ergebnissen gegenübergestellt werden. Zu diesem Zweck stehen verschiedene neue Messmethoden zur Verfügung, z.B. GEWAND, OCT, Hall-Effekt-Dickenmesser.
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LI, KUI-YU, et 李奎昱. « The Study of Forming Quality of the Counter Pressure Mechanism on Liquid-assisted Injection Molding ». Thesis, 2014. http://ndltd.ncl.edu.tw/handle/q6rnxz.
Texte intégralRésumé :
碩士中原大學
機械工程研究所
102
Liquid-Assisted Injection Molding(LAIM) is short shot filling plastic melt. When center layer plastic melt under melting state add liquid let finished presented hollow. The purpose is Use hollow forming and liquid feature can reached save materials and upgrade finished quality. In LAIM, The assisted liquid penetration capability is impact process main factor. Liquid penetration capability than gas higher and Incompressibility capability easy produce finished center layer orderless. Impact liquid penetration capability parameters is liquid pressure and temperature. Control Pressure need mobile directions install pressure sensors, and use liquid assisted machine variable adjustment changes, and observation pressure changes for finished impact. Control temperature need near mold side install temperature sensors, and mobile directions outside pack insulation foam reduce heat diffuse. In this study, use visualization mold and paperclip shape mold insert. Record Gas Counter Pressure(GCP) under finished plastic melt flow state and liquid penetration capability and epidermal layer thickness changes by the visualization window and the plastic join particle. GCP LAIM and GCP GAIM make than penetration capability and thickness changes. Use changes liquid viscosity , the study of viscosity for liquid penetration capability impact. Get on GCP applications in LAIM mold flow analysis and real mobile state prove. Complete LAIM combined GCP database. The results of Experiments analysis, join GCP can subjoin liquid penetration stability, although reduce finished hollow area, but can upgrade finished penetration length cause overall penetration average. In GCP LAIM and GCP GAIM compare section. LAIM because liquid incompressibility and thermal fast, so it need forming pressure hold time short in penetration average and stable also than GAIM. Improve injection liquid viscosity can change heat conduction and viscous force, further change finished penetration length and hollow area.
Livres sur le sujet "Molding (forming)"
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Reyne, Maurice. Plastic forming processes. Hoboken, NJ : John Wiley, 2008.
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Huang, Yong. Novel Colloidal Forming of Ceramics. Berlin, Heidelberg : Springer-Verlag Berlin Heidelberg, 2011.
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Igami, Hideo. Purasuchikku shīto fōmingu : Atarashii gijutsu chōryū to sōzōteki sekkei shuhō = Plastic sheet forming : a new technical trend and creative design methods. Tōkyō-to Chiyoda-ku : Kurieito Nippō Shuppanbu, 2012.
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United States. Environmental Protection Agency. Office of Water Regulations and Standards. Industrial Technology Division. Development document for effluent limitations guidelines and standards for the plastics molding and forming point source category. Washington, D.C : U.S. Environmental Protection Agency, Office of Water, Office of Water Regulations and Standards, Industrial Technology Division, 1985.
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Rongkuan, Shen, dir. Mo zao cheng xing gong yi ming ci ci dian : English Chinese dictionary of metal forming. Taibei Shi Dazhi : Ming shan chu ban she, 1985.
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Reyne, Maurice. Plastic Forming Processes. Wiley & Sons, Incorporated, John, 2010.
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Reyne, Maurice. Plastic Forming Processes. Wiley & Sons, Incorporated, John, 2013.
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Reyne, Maurice. Plastic Forming Processes. Wiley & Sons, Incorporated, John, 2013.
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Reyne, Maurice. Plastic Forming Processes. Wiley & Sons, Incorporated, John, 2010.
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Composite sheet forming. Amsterdam : Elsevier, 1997.
Trouver le texte intégralChapitres de livres sur le sujet "Molding (forming)"
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Sandberg, Dick, Otto Eggert, Andreas Haider, Fred Kamke et André Wagenführ. « Forming, Densification and Molding ». Dans Springer Handbook of Wood Science and Technology, 943–89. Cham : Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-030-81315-4_18.
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Yao, Donggang. « Polymer Micro-Molding/Forming Processes ». Dans Micro-Manufacturing, 197–233. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118010570.ch7.
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López-Adrio, David, et David Álvarez. « Polymers Injection Molding, Process & ; Defects ». Dans Materials Forming, Machining and Tribology, 81–104. Cham : Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-48468-1_5.
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García-Collado, Alberto, et Rubén Dorado-Vicente. « Understanding the Virtual Injection Molding Product Design ». Dans Materials Forming, Machining and Tribology, 39–47. Cham : Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-48468-1_3.
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Kajikawa, Shohei, Masaya Horikoshi, Takashi Kuboki, Soichi Tanaka, Kenji Umemura et Kozo Kanayama. « Fluidity of Wood Composite Combined with Natural Binder on Injection Molding ». Dans Forming the Future, 2031–40. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-75381-8_171.
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Huang, Yong, et Jinlong Yang. « Aqueous Colloidal Injection Molding of Ceramics Based on Gelation ». Dans Novel Colloidal Forming of Ceramics, 1–15. Berlin, Heidelberg : Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-12281-1_1.
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Yang, Jinlong, et Yong Huang. « Aqueous Colloidal Injection Molding of Ceramics (CIMC) Based on Gelation ». Dans Novel Colloidal Forming of Ceramics, 1–16. Singapore : Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-1872-0_1.
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Liebl, Michael, Jonas Holder, Tobias Mohr, Albert Dorneich, Florian Liebgott et Peter Middendorf. « Development, Implementation and Evaluation of a Prototype System for Data-Driven Optimization of a Preforming Process ». Dans Advances in Automotive Production Technology – Towards Software-Defined Manufacturing and Resilient Supply Chains, 296–306. Cham : Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-27933-1_27.
Texte intégralRésumé :
AbstractModern production of fiber reinforced composites via the preforming process is widely used in the industry. A common way to create dry, semi-finished fiber products is forming or draping a textile into a three-dimensional component geometry. The punch and die process is often used for resin transfer molding (RTM) composite manufacturing. Due to the major influence of the preforming step on the later mechanical performance of the component, a detailed knowledge of the fiber architecture is beneficial.To enable in-situ monitoring of the specific deformation of a woven fabric, a novel kind of single-use two-dimensional strain sensors has already been developed and characterized. We show that by using industrial communication standards, data from various data sources can be consolidated in an edge computer and used to improve the process. To this end, we developed the hardware and firmware of a device that reads out the printed strain sensors and transfers the data to the edge device via IO-Link. In addition, the edge device collects data from a programmable logic controller and is capable of connecting further IO-Link sensors.Our demonstrator is intended as a proof of concept for in-situ monitoring, data-driven analysis and improvement of the punch and die process and will be further developed. We propose a machine learning-based edge analytics approach for detecting defects and increasing the preforming quality during the draping process. Forming tests with the double-dome benchmark geometry and the carbon fabric which is suitable for industry have been carried out to validate our prototype system.
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Li, Wenlian, et Wanjing Bo. « Teaching Research and Exploration of “Stamping Forming Technology and Molding Design” Course under the Background of New Engineering ». Dans Advances in Social Science, Education and Humanities Research, 262–70. Paris : Atlantis Press SARL, 2024. http://dx.doi.org/10.2991/978-2-38476-263-7_34.
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Shinozaki, Akira, et Junpei Kinoshita. « Precision Polishing Techniques for Metal Molding Dies and Glass Forming Technology “Slumping Method” ». Dans Product Life Cycle - Opportunities for Digital and Sustainable Transformation [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.99208.
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Precision manufacturing techniques are required for the fabrication of small and large optical components in various fields. To prepare molding dies with highly precise geometric shapes and surface roughness that are used in certain molding processes, polishing techniques have been investigated for many materials. In this research, the polishing techniques used for a SUS310S stainless steel molding die for the glass forming technology “slumping method” were investigated. The surface roughness of the polished SUS310S molding die surface was below Rz = 120 nm (P–V), Ra = 20 nm after 35 h of polishing with 0.5% alumina polishing liquid under a pressure of 1.7 kPa. In addition, the centerless polishing machine was designed and manufactured to polish cylindrical molding die surfaces with same polishing conditions. As the result of using cylindrical molding dies that made by this centerless polishing machine, the surface roughness of the glass plate formed using the slumping method with the polished molding die was below Ra = 20 nm. These results indicate that the surface roughness of the molding die had a small effect on the glass plate surface formed using the slumping method.
Actes de conférences sur le sujet "Molding (forming)"
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BELLISARIO, D. « Recycling of thermoset fiberglass by direct molding of ground powders ». Dans Material Forming. Materials Research Forum LLC, 2024. http://dx.doi.org/10.21741/9781644903131-265.
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Abstract. Fiberglass production in western Europe exceeds one million tons per year, and data of the European Commission inform that at their end-of-life, 25% of waste fiberglass is sent to landfill. Being a thermosetting material, it polymerizes during its production, when a molecular network is generated into the matrix. This network is responsible for its optimal properties, but it prevents the material flow under heating and thus reprocessing. A new recycling process for fiberglass waste has been proposed by the authors without any use of virgin materials or additives. This technology consists of a direct molding (i.e., compression molding) of pulverized fiberglass. The material agglomeration depends on the combination of several mechanisms, from residual reactivity, to powder re-activation and incipient degradation during molding. Residual fiberglass powder has been recovered from a factory that specializes in technical laminates, where a grinding process is used to provide the expected tolerance to the products. The recovered powder has been direct molded to manufacture small samples for mechanical testing. Such powder shows thermal activation in the DSC (differential scanning calorimetry) at low temperature (about 80°C). This study shows the feasibility of recycling waste fiberglass without using any virgin material; these new findings are related to the use of industrial powders, their testing under 4-point bending and the obtaining a good, molded surface.
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VELLA, A. « Rapid tooling development for low volume injection molding of cosmetic compacts ». Dans Material Forming. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902479-23.
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Abstract. This study aimed to explore the capability of different additive manufacturing (AM) or 3D printing technologies to rapidly manufacture mold inserts for injection molding as well as to evaluate the performance of the printed mold inserts and the quality of the injection molded parts. Fused filament fabrication (FFF), stereolithography (SLA), and multi-jet fusion (MJF) 3D printing technologies were used to produce the mold inserts, whereas a cosmetic compact base was selected as the case study part. The results obtained show that it is possible to use the mentioned technologies to manufacture tool inserts for rapid prototyping or low volume production of cosmetic compact bases using injection molding. When using the FFF mold inserts, the cosmetic compact bases produced were not of the best quality and surface finish but still acceptable for prototyping purposes only. The vertically printed SLA mold inserts as well as the MJF mold inserts produced cosmetic compact bases with no flashes and the best surface finish. The MJF mold inserts had excellent thermal properties so that apart from HDPE, a higher melting temperature ABS was also successfully molded. Also using the MJF mold inserts, the highest production number of 80 cosmetic compact bases of a good quality could be achieved.
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RAIMONDI, Luca. « Effects of UD and twill reinforcements in hybrid sheet molding compound laminates ». Dans Material Forming. Materials Research Forum LLC, 2024. http://dx.doi.org/10.21741/9781644903131-58.
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Abstract. This work proposes a novel manufacturing solution to locally reinforce a Sheet Molding Compound (SMC) with continuous fiber prepreg in a single-step compression molding operation. An adapted SMC process allowing for the manufacturing of continuous carbon fiber-reinforced SMC was successfully implemented, and a layer of fabric was added to mitigate the waviness induced during processing. Plates with different stacking sequences were manufactured and used for mechanical characterization to understand the effect of hybridization over tensile and flexural properties. It emerges that hybridization led to a 137% increase in tensile strength and up to 147% rise in flexural modulus compared to the standard SMC baseline. Additionally, the hybridization process helped reduce the variability in elastic and strength properties.
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Savva, George. « Coatings in Forming and Molding Applications ». Dans 66th Society of Vacuum Coaters Annual Technical Conference. Society of Vacuum Coaters, 2023. http://dx.doi.org/10.14332/svc23.proc.0051.
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CLOËZ, Liam. « Machinability of PLA obtained by injection molding under a dry milling process ». Dans Material Forming. Materials Research Forum LLC, 2024. http://dx.doi.org/10.21741/9781644903131-208.
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Abstract. This paper is part of a study focusing on the elaboration of accurate component with complex geometries using bio-sourced as an alternative to petrochemical polymer. The bio-sourced and biodegradable in this study is composed of a Poly Lactic Acid (PLA) matrix and hemp fibers. The final component is obtained by injection followed by a machining operation. the final component is obtained by injection followed by a machining finishing operation. Injection molding will be carried out to be compared with 3D printing on economic, environmental, production and workpiece quality criteria. This paper focuses only on the combination of two processes, injection molding followed by machining on poly (L-lactic acid) or PLLA which is biobased and biodegradable. After injecting the workpiece, thermo-physical characterization tests are realized on PLLA polymer. Rheology, thermal and mechanical tests are carried out in order to study thermomechanical behavior and to understand material flow phenomena at different temperatures and shear rates. The objective of this paper is to overcome the technical challenges of milling this material without any lubricant. In an upcoming project, various machining operations will be carried out such as turning to study continuous cutting, or milling to study discontinuous cutting on workpieces reinforced with bio-sourced fibers as hemp.
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VU, Anh Tuan. « Surrogate modeling for multi-objective optimization in the high-precision production of LiDAR glass optics ». Dans Material Forming. Materials Research Forum LLC, 2024. http://dx.doi.org/10.21741/9781644903131-197.
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Abstract. This study addresses the ever-increasing demands on glass optics for LiDAR systems in autonomous vehicles, highlighting the pivotal role of the recently developed Nonisothermal Glass Molding (NGM) in enabling the mass production of complex and precise glass optics. While NGM promises a significant advancement in cost- and energy-efficient solutions, achieving the requisite shape and form accuracy for high-precision optics remains a persistent challenge. The research focuses on expediting the development phase, presenting a methodology that strategically utilizes a sparse dataset for determining optimized molding parameters with a minimized number of experimental trials. Importantly, our method highlights the exceptional ability of a robust surrogate model to precisely predict the accuracy outputs of glass optics, strongly influenced by numerous input molding parameters of the NGM process. This significance emphasizes the surrogate model, which emerges as a promising alternative to inefficient traditional methods, such as time-consuming experiments or computation-intensive simulations, particularly in the realm of high-precision production for LiDAR glass optics. In contributing to optics manufacturing advancements, this study also aligns with contemporary trends in digitalization and Industry 4.0 within modern optics production, thereby fostering innovation in the automotive industry.
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Yamada, J., H. Ibe, K. Sato et N. Kato. « Functional WC Cemented Carbide by the Direct Selective Laser Forming ». Dans ITSC2017, sous la direction de A. Agarwal, G. Bolelli, A. Concustell, Y. C. Lau, A. McDonald, F. L. Toma, E. Turunen et C. A. Widener. DVS Media GmbH, 2017. http://dx.doi.org/10.31399/asm.cp.itsc2017p0725.
Texte intégralRésumé :
Abstract Metal and polymer additive manufacturing is advancing on several applications. On the other hand, materials cermet such as WC/Co for functional structure molding by additive manufacturing are under studying. There are few reports for WC cemented carbide additive manufacturing process by forming with polymer binder then sintering. This indirect process has difficulties to make high precision functional parts due to shape control during additional sintering process. Direct forming is desired for high precision parts. However, factors and/or mechanism to achieve direct formed functional structure have been unclear in many aspects. In this study, the process conditions of the direct selective laser melting were investigated to achieve dense and hard WC cemented carbide mold parts. The optimization of laser melting conditions for WC/Co agglomerated and sintered powder was examined. In order to forming a dense and high hardness parts, the optimum conditions between powder preparation and laser energy density which related with laser power, scan speed and spot diameter were appeared by this experiments. Moldings more than 1500HV are achieved at low laser energy density. However, some of pores were observed in moldings. In addition, the dense molding could be obtained by high laser energy density. This means optimum dense functional WC cemented carbide molding is available by optimization of the molding condition. It is applicable for growing industries like automotive, aviation and cutting tool.
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BELLISARIO, D. « Out-of-autoclave molding of carbon fiber composites pipes with interlaminar carbon nanotubes ». Dans Material Forming. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902479-194.
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Abstract. Carbon fiber reinforced (CFR) composite rings with and without interlaminar carbon nanotubes (I-CNTs) were manufactured starting from high performance prepregs used in aeronautics. Nano-particles deposition was obtained by an innovative easily scalable procedure which does not affect composite processability. A CNTs-solvent solution was sonicated for an established time to reduce bulk CNTs agglomerates. The solution was poured on prepreg stripes and left at room temperature for solvent evacuation. The prepreg stripes were wrapped on steel pipe to obtain the annular configuration and manufactured by an out-of-autoclave (OOA) process. The consolidation pressure was applied through a thermo-shrinkable tube and curing occurred in oven. Stereomicroscopy and mechanical tests were performed on CFR and I-CNTs/CFR rings. A good adhesion among the plies was observed as well as the positive effects of CNTs deposition; an increase of 34%, 15% and 17% was obtained for the stiffness, the peak load and the fracture energy of the functionalized rings, respectively.
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LÜCKENKÖTTER, J. « Feasibility study of compression molding for large reinforcement structures in the commercial vehicle sector ». Dans Material Forming. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902479-27.
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Abstract. Due to an increasing volume of shipments, there is a significant need for more delivery vehicles. One approach to reduce the associated increase in carbon dioxide (CO2) emissions is a new light weight design approach involving the substitution of conventional materials with glass fiber mat-reinforced thermoplastics (GMT) based on polypropylene (PP). The application of GMT by compression molding is a widely used process in the automotive industry. However, application in the commercial vehicle sector requires much larger dimensions, making it necessary to clarify whether the manufacturing process and material are suitable for semi-structural applications on this scale. To find this out, two replacement geometries are abstracted in this study and manufactured by varying the main manufacturing parameters. The feasibility can be demonstrated by recording and analyzing the resulting process variables and measuring the formed fiber distribution. At the end of the paper, recommendations are given for the production of GMT structures on the scale of commercial vehicles.
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BORTOLETTO, Anna. « Investigation of the effects of gas-counter-pressure injection molding on the properties and manufacturability of post-consumer recycled polypropylene ». Dans Material Forming. Materials Research Forum LLC, 2024. http://dx.doi.org/10.21741/9781644903131-299.
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Abstract. In contemporary times, the most effective strategy for mitigating the environmental effects of plastics and their manufacturing is recycling. However, producing high-quality items from recycled materials remains a challenge. This study addresses these challenges, specifically focusing on the injection molding process for recycled polypropylene. Key issues identified include poor surface finish of the molded items, mold contamination with oily residues, and strong odors during processing. The proposed solution involves the innovative use of gas counter pressure in conjunction with injection molding. The study explores various nitrogen pressure levels to assess their impact. Findings indicate that an optimal pressure level significantly improves the surface quality of the products and reduces the accumulation of dirt in the mold cavities. While gas counter pressure does not mitigate odor emissions, it represents a promising step forward in developing a high-quality recycled polypropylene compound. This approach could pave the way for more advanced recycling techniques, enhancing the quality of products made from recycled plastics.