Relevant bibliographies by topics / Thermo-stamping

Academic literature on the topic 'Thermo-stamping'

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Published: 15 February 2024

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Journal articles on the topic "Thermo-stamping"

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Yin, Hong Ling, Xiong Qi Peng, Tong Liang Du, and Jun Chen. "Experiment Study of Thermoforming of Plain Woven Composite (Carbon/Thermoplastics)." Key Engineering Materials 554-557 (June 2013): 507–11. http://dx.doi.org/10.4028/www.scientific.net/kem.554-557.507.

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By combining carbon woven fabric with thermoplastics grains, a thermo-stamping process is proposed for forming parts with complex double curvatures in one step, to implement the affordable application of fiber reinforced composites in high volume merchandises such as automotive industry. In the proposed thermo-stamping process, laminated carbon woven fabrics with thermoplastic grains are heated, and then transferred rapidly to a preheated mould for thermo-stamping, and cooled down to form the carbon fiber reinforced composite part. Various thermoplastics such as PP, PA6 and ABS are used as matrix material in the composite part. Experimental results including shear angle distribution in the fabric, deformed boundary profile of fabric with different original fiber orientation and forming defects are presented. It is demonstrated that high quality parts can be obtained with the proposed forming process, and defects are controllable. By using the proposed process and laminated structures, it is feasible to implement the high-volume and low-cost manufacturing of fiber reinforced composite parts.
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Cai, Yu Jun, Felix Stephanus Halim, Guo He Li, and Yu Guang Wang. "Thermo-Mechanical Simulation of Hot Stamping Tools Design." Applied Mechanics and Materials 121-126 (October 2011): 2390–94. http://dx.doi.org/10.4028/www.scientific.net/amm.121-126.2390.

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Hot stamping is a process which simultaneously forms and quenches the hot blanks at the austenization temperature (900-1200 °C) to produce full martensitic Ultra High Strength (UHS) steel structure. Automobile manufacturers use hot stamping to produce many car frame components which can decrease the total weight of the car and increase the car safety. The aim of this paper is to simulate the thermo-mechanical process of the hot stamping which consists of FEA simulations by using Abaqus/Explicit. The process includes too steps: heating of the blank to 900°C, and simultaneous punching and quenching process to increase the tensile strength of the material. The objectives of the FEA simulation are to obtain thermo-mechanical properties of the material and to predict strength of the steel as the product of hot stamping. The results of this simulation will be the values of maximum Von Mises stress and nodal temperature of the blank, the punch reaction force, and also the prediction of the yield strength and tensile strength of the material which will be compared to the yield strength and tensile strength of the available steel alloy data.
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Liu, Yong Gang, Yun Zhang, Wu Zhang, Jun Wan Li, Hong Bin Wang, Hai Rong Gu, and Jia Chun Jin. "Investigation of Hot Stamping Process of 22MnB5 Based on Metallo-Thermo-Mechanical Theory." Advanced Materials Research 1063 (December 2014): 251–56. http://dx.doi.org/10.4028/www.scientific.net/amr.1063.251.

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In this study, based on the metallo-thermo-mechanical coupling theory, a FEM model of hot stamping including forming and quenching is built to investigate the cooling behavior and the microstructure evolution, and to predict the final mechanical properties of hot-stamped components. The results show that, after about 16s, the temperature of the entire component is lower than Mf of 22MnB5 boron steel and with a continuous uniform distribution. Most of austenite in component has transformed into martensite. To satisfy the required mechanical properties, the sufficient holding time of quenching in die is essential and it plays an important role in ensuring the required hardness. The predicted Rockwell hardness of component after hot stamping process is almost 512HV, which shows a good agreement with the experimental results. It implies that the metallo-thermo-mechanical numerical model established in this study is reasonable and reliable, which can provide a theoretical guidance for optimizing the hot stamping procedure.
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Sakai, Hiroshi. "Thermo Prepreg for the Hot Flow Stamping Molding." Seikei-Kakou 27, no. 3 (February 20, 2015): 85–88. http://dx.doi.org/10.4325/seikeikakou.27.85.

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Chen, Wei, Zhi Feng Chen, Zhi Fu Cao, Tao Qi, Xiang Wang, and Qing Zhao. "Study on the Hot Stamping of Rectangular Box with Ultra-High Strength Steel." Advanced Materials Research 763 (September 2013): 156–59. http://dx.doi.org/10.4028/www.scientific.net/amr.763.156.

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Hot stamping of the ultra high strength steel (UHSS) was studied to meet the requirements of lightweight of automobile. The coupled thermo-mechanical model for hot stamping was established with ABAQUS. Initial temperature of tools (die, punch, blank holder) and stamping speed were studied to insure the impact on the thickness, stress and strain of blank. It shows that punch fillet area is easy to crack. With the temperature of tools increasing, the sheet minimum thickness increases first and then decreases. With the increase of punch velocity, the sheet minimum thickness increases. Compared with the initial temperature of tools, punch velocity has a greater impact on the thickness. The simulation results are in agreement with the experimental results and provide a theoretical basis for the practical stamping process.
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Xing, Zhong Wen, Jun Jia Cui, Hong Sheng Liu, and Chun Feng Li. "Numerical and Experimental Investigation into Hot Stamping of High Strength Steel Sheet for Auto B Pillar Reinforced Panel." Advanced Materials Research 129-131 (August 2010): 322–27. http://dx.doi.org/10.4028/www.scientific.net/amr.129-131.322.

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Hot stamping is an innovative way to manufacture complex-shaped components of high strength steel (HSS) sheet with a minimum of springback, meanwhile, it can also obviously improve the tensile strength of the formed parts.The coupled thermo-mechanical FE model for hot stamping of HSS sheet for the B pillar was established by commercial software Pam-stamp. Dynamic explicit module was used to simulate the forming processes under different process parameters. The effects of process parameters on thinning of the blank were studied, the maximum thinning zones of the blank in hot stamping were analyzed. The results show that the thinning rates of the blank increase when the blank holder force(BHF) and friction coefficient increase, the maximum thinning zones appear at the straight wall and corner of the B pillar. The causal of blank thinning during hot stamping was analyzed. Experiments had been conducted with the process parameters obtained by simulation. The experimental and simulation results were in good agreement.
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Wang, Li Min, Tian Rui Zhou, Li Juan Wang, and Xiao Ling Yang. "Investigation on the Numerical Simulation of Hot Stamping of Advanced High Strength Steels." Advanced Materials Research 189-193 (February 2011): 2144–47. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.2144.

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Hot stamping represents an innovative manufacturing process for forming of advanced high strength steels, implying a sheet at austenite temperature being rapidly cooled down and formed into a die at the same time (quenching). This affords the opportunity to manufacture components with complex geometric shapes, high strength and a minimum of springback which currently find applications as crash relevant components in the automotive industry. With regard to the numerical modeling of the process, the knowledge of thermal and thermo-mechanical properties of the material is required. The material model under hot stamping condition of advanced high strength steel should be set up. The Finite Element Analysis is an essential precondition for a good process design including all process parameters. This paper presents the finite element simulation of a hot stamping process and describes a number of procedures for the simulation of hot stamping. In addition, the development direction is pointed out at the end of this paper.
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Wang, Chao, Bin Zhu, Yi Sheng Zhang, Jie Shi, and Han Dong. "Hot-Stamping Process Simulation and Optimize Research for Collision Beam of Automobile Door." Advanced Materials Research 201-203 (February 2011): 3–8. http://dx.doi.org/10.4028/www.scientific.net/amr.201-203.3.

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Hot-stamping molding for ultra-high-strength steel have some similarities with traditional cold-stamping molding in the aspects of molding process and die design. But due to the effect of temperature variation of blank, hot-stamping have some differences in ultra-high-strength products design, material selection and forming process design. Some special forming defects, such as local thinning, cracking and wrinkling, could appear in hot-stamping process due to these differences. In order to obtain uniform phase structure and get high-quality products, it is very important to be able to predict and control the blank temperature and the consistence of blank cooling rate. The thermo-mechanical characteristics of hot-stamping are studied with the material of ADVANCE1500 (22SiMnTiB). Based on the results of simulations and experiments, conclusion are drawn that the complexity of the product and the blank which contacts with die asynchronously causes the uneven distribution of the blank temperature. This is the key factor that leads to the poor mobility of the blank material and local thinning, cracking, wrinkling and other defects in forming process. Proper clearance between punch and die can reduce the probability of defects which could contribute to the improvement of hot-stamping process.
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Zhu, Hong, Hongbin Yin, and Sriram Sadagopan. "Study of Microstructural Evolution of Press Hardening Steels using Dilatometer and In-situ Studies for a Simulated Hot Stamping Condition." IOP Conference Series: Materials Science and Engineering 1284, no. 1 (June 1, 2023): 012008. http://dx.doi.org/10.1088/1757-899x/1284/1/012008.

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Abstract Press hardening grades are widely used in automotive industries for safety-critical structural parts due to their unique combination of high strength, excellent formability, and crash performance. Considering various scenarios on thermo-mechanical profiles in different hot stamping lines, achieving the targeted strength and ductility / fracture strain in the hot-stamped parts is still challenging to some hot stampers for some grades. In this investigation, a dilatometer study for Usibor®1500 and two emerging grades Usibor®2000 and Ductibor®1000 under a given hot stamping condition was conducted with consideration of the entire hot-stamping processes (i.e., austenitization, blank transfer, forming and final quenching from 700°C) to understand the differences in critical cooling rates, and evolution of microstructures. Influence of large forming strain (15%) on final properties is also examined for Ductibor®1000 and Ductibor®500 by DIL 805 A/D dilatometer under tensile deformation mode. In-situ observation of microstructural evolution during hot stamping process for Usibor®1500 is explored using Confocal scanning laser microscope to uncover some physical phenomena for further refinement of hot stamping practices.
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Merklein, M., and J. Lechler. "Investigation of the thermo-mechanical properties of hot stamping steels." Journal of Materials Processing Technology 177, no. 1-3 (July 2006): 452–55. http://dx.doi.org/10.1016/j.jmatprotec.2006.03.233.

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Dissertations / Theses on the topic "Thermo-stamping"

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Potdar, Bhargav [Verfasser], Marion [Akademischer Betreuer] Merklein, Marion [Gutachter] Merklein, and Björn [Gutachter] Kiefer. "A reliable methodology to deduce thermo-mechanical flow behaviour of hot stamping steels / Bhargav Potdar ; Gutachter: Marion Merklein, Björn Kiefer ; Betreuer: Marion Merklein." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2017. http://d-nb.info/1173975748/34.

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Liu, Zhigang. "Étude numérique et expérimentale de AZ31-O feuille en alliage de magnésium formage à chaud." Phd thesis, Ecole Nationale Supérieure des Mines de Paris, 2012. http://pastel.archives-ouvertes.fr/pastel-00718370.

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Dans ce projet, le matériau est l'alliage de magnésium AZ31-O en tôle. L'épaisseur de tôles est de 1,2 mm. Les essais de traction à chaud sont réalisés afin d'étudier la ductilité de l'alliage de magnésium AZ31-O, la température et l'influence la vitesse de déformation sont incluses dans tous les tests. Le résultat d'analyse montre que la ductilité est renforcée avec une température croissante et une vitesse de déformation décroissante, le phénomène d'adoucissement est évident à la température élevée. La propriété anisotrope n'est pas considérée dans ce projet. Les essais Nakazima à chaud avec le poinçon d'hémisphère sont réalisés pour étudier la formabilité de l'alliage de magnésium AZ31-O. Enfin, la FLD (Forming Limit Diagram) est identifiée et les comparaisons montrent que la formabilité est préférable à une température plus élevée. En outre, les prédictions des limites de formage sont effectuées dans le modèle M-K. La comparaison montre clairement avec la prédiction théorique ne convient pas avec l'expérience. Les simulations des éléments finis sont effectuées pour un emboutissage par poinçon hémisphérique et un emboutissage en croix. Tout d'abord, les simulations d'emboutissage de poinçon hémisphérique sont réalisés sur FORGE® et sur ABAQUS®. Les résultats des simulations de FORGE et de ABAQUS sont comparés afin d'étudier la différence de divers codes de simulation des éléments finis. Deuxièmement, le comportement de d'endommagent est étudié dans FORGE par modèle d'endommagement Lemaitre. Enfin, la simulation d'emboutissage en croix qui est un benchmark de la conférence 2011 NUMISHEET est réalisée avec FORGE. La charge de poinçon, l'épaisseur et la distribution de température sont obtenues et comparées pour chaque simulation. En outre, ces résultats de la simulation de benchmark (FORGE) sont également comparés à d'autres logiciels de simulation en conférence. Les résultats des analyses détaillées sont présentés dans cette thèse.
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Lacoma, Vincent. "Évaluation environnementale des procédés composites pour l'analyse multicritère des systèmes de production : méthodologies, outils et applications." Electronic Thesis or Diss., Ecole centrale de Nantes, 2023. http://www.theses.fr/2023ECDN0020.

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Dans le contexte actuel de transition environnementale, cette thèse vise à participer à la réduction des impacts environnementaux de la fabrication de pièces en composites, qui est un secteur en croissance depuis plusieurs années.Pour cela, une méthodologie d’analyse environnementale spécifique aux procédés composites est fondamentale pour développer et évaluer des stratégies de réduction des impacts environnementaux. Pour être applicables dans l’industrie, ces stratégies se doivent de respecter les impératifs techniques et économiques des entreprises. Pour réaliser des évaluations environnementales, la méthode standardisée d’Analyse de Cycle de Vie (ACV) peut être employée. Cependant, le caractère général de cette approche laisse des latitudes sur son application qui n’ont pour le moment pas fait l’objet d’un consensus de la part de la communauté scientifique dans le cas des procédés composites.Ces travaux de thèse proposent alors des précisions de chaque étape de la méthode ACV pour construire une modélisation des impacts environnementaux du procédé qui dépendent des paramètres, comme par exemple les températures de mise en forme et les efforts de consolidation. Une approche similaire est aussi développée pour l’évaluation d’indicateurs économique également fonction de ces paramètres. Des outils d’exploitation multicritères sont enfin proposés pour trouver des réponses à l’objectif de réduction des impacts environnementaux et du coût de fabrication tout en assurant la conformité au cahier des charges techniques des pièces produites. Dans ce mémoire, le cas du thermoformage-estampage de pièces en polysulfure de phénylène renforcées par des fibres de carbone (C/PPS) est étudié pour appuyer la construction et la présentation des méthodologies proposées
In the current context of environmental transition, this thesis aims to participate in the reduction of environmental impacts related manufacturing of composite parts, which has been a growing sector for several years. To this purpose,an environmental assessment methodology dedicated to composite manufacturing processes is fundamental to develop and evaluate strategies forreducing environmental impacts. To be applicable in the industry, these strategies must respect the technical and economic imperatives of companies.To carry out environmental assessments, the standardized Life Cycle Assessment (LCA) method can be used. However, the general nature of this approach leaves latitudes on its application which have not been yet the subject of a scientific consensus in the case of composite manufacturing.Thus, our work proposes details for each step of the LCA method to build a model of the environmental impacts of the manufacturing process which depend on its parameters, such as the forming temperatures and the consolidation efforts. A similar approach is also developed for the evaluation of economic indicators based on the same parameters. Finally, multi-criteria decision-making tools are offered to find solutions to the objective of reducing environmental impacts and manufacturing costs while ensuringc ompliance with the technical specifications of the parts produced. In this thesis, the case of thermostamping of polyphenylene sulfide reinforced with carbon fibres (C/PPS) parts is studied to support the construction and presentation of the proposed methodologies
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Le, Meur Kevin. "Etude du procédé d'estampage de plaques composites thermo-plastiques et recherche d'une méthodologie efficiente pour l'analyse de la faisabilité d'une pièce complexe." Thesis, Lyon, INSA, 2015. http://www.theses.fr/2015ISAL0115.

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Le procédé de thermo-estampage est une voie intéressante pour la production en grande série de pièces composites. Cependant ce procédé est complexe à maitriser et simuler, en raison des phénomènes multi-physiques mis en jeu (déformation textiles, choc thermique, frottements...) ce qui engendre des campagnes par essai-erreurs qui peuvent être très coûteuses. Cette étude s'intéresse à la mesure et à la caractérisation du procédé d'estampage et des matériaux utilisés afin de simuler le refroidissement de la matrice et la mise en forme du textile. Des défauts récurrents sont évoqués ainsi que des solutions industrielles afin de les résoudre. La simulation thermique permet de déterminer le temps de consolidation nécessaire afin d'optimiser les temps de production en fonction des matériaux et de leur épaisseur. La simulation de la mise en forme textile permet de prédire la faisabilité d'une pièce et l'orientation des fibres afin de définir au mieux les pièces suivant les cas de charges statiques et dynamiques. Les apports de ce travail sont les suivants : la réalisation de mesures thermiques du flan durant un estampage et du choc thermique en surface du stratifié, la réalisation d'une méthodologie efficiente pour analyser la faisabilité d'une pièce complexe dans un contexte industriel grâce à des simulations de mise en forme couplées à des essais expérimentaux. Enfin une méthode d'analyse du comportement en cisaillement plan, pour des renforts dont les fils de chaîne et de trames ne sont pas orthogonaux est proposée
The thermo-stamping process is a promising way for the mass production of the composite parts. However this process is complex to master and simulate due to the multi-physics background (textile deformation, thermal shock, rubbing...) and trial and error tests campaigns can be expensive. This study focuses on the measurement and assessment of the process and materials behaviour, to simulate the cooling down of the matrix and the forming of the woven. Typical defects are mentioned as well as associated industrial solutions to solve them. The simulation makes it possible to determine the consolidation time necessary in order to optimize the manufacturing time as a function of the material used and of its thickness. Furthermore the forming simulation shows the feasibility of the part and the fibre orientation to design the product for the static and crash cases. The contributions of this work are the following: thermal measurements of the pre-consolidated plate during the stamping phase and the thermal chock at the surface of the composites, an efficient method to analyse the feasibility of a complex shape in an industrial context is proposed through forming simulations compared to the experiment. Finally, a methodology for the analysis of the in-plane shearing behaviour of a woven fabric with non-orthogonal warp and weft yarn is proposed
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Book chapters on the topic "Thermo-stamping"

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Li, Da Yong, Qun Feng Chang, Ying Hong Peng, and Xiao Qin Zeng. "Thermo-Mechanical Coupled Simulation of Warm Stamping of AZ31 Magnesium Alloy Sheet." In Materials Science Forum, 281–84. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-432-4.281.

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Conference papers on the topic "Thermo-stamping"

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Cao, Wan, Ning Kang, Lingyu Sun, Shanshu Xiang, Xudong Yang, and Yiben Zhang. "Generation Mechanism of Interfacial Residual Stress and its Effect on Mechanical Properties of Hybrid Fiber-Reinforced Thermoplastic Polymer (HFRTP)." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-86523.

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For automotive weight reduction, fiber-reinforced thermoplastic polymer (FRTP) is preferred due to its short curing time, good recycling and easy formability of complex parts. Hybrid fiber-reinforced thermoplastic polymer (HFRTP) can take the advantage of two processes (thermo-stamping and injection) and two materials (continuous FRTP and discontinuous FRTP) to form an integrated structure with both complex shape and excellent performance simultaneously. However, the unmatched thermodynamic properties between different materials would produce interfacial residual stress (IRS) as the temperature variation, which will cause the structure separate at the interface and structural warping. This paper would explain the generation mechanism of IRS between thermo-stamping zone of continuous FRTP and injection zone of discontinuous FRTP and investigate the effect of IRS generated during the process on the subsequent load-bearing capacity. The simulation results found that the generation mechanism is that the residual stress of over-molded injection is the superposition of shrinkage stress and thermal stress, which has a negative effect on the mechanical properties.
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Chen, Xiangjun, Namin Xiao, Dianzhong Li, Guangyao Li, and Guangyong Sun. "The coupled thermo-mechanical-microstructural finite element modeling of hot stamping process in 22MnB5 steel." In NUMISHEET 2014: The 9th International Conference and Workshop on Numerical Simulation of 3D Sheet Metal Forming Processes: Part A Benchmark Problems and Results and Part B General Papers. AIP, 2013. http://dx.doi.org/10.1063/1.4850034.

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Shih, Hua-Chu, and Ming F. Shi. "Die Wear and Coating Galling in Stamping Advanced High Strength Steels." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-62668.

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Advanced high strength steels (AHSS) have been widely used in vehicle structural components due to their high strength nature with balanced formability. In a typical application, a zinc coating is often required and applied to AHSS for the purpose of corrosion protection. Due to the high strength nature of AHSS, higher forming forces and binder pressures are also required in stamping AHSS, which often results in coating galling and die wear. The degree of coating galling and die wear depends upon forming process variables such as contact pressure, forming speed, lubrication and die temperatures. In this study, the Bending Under Tension (BUT) tester was used to evaluate the effects of these process variables on coating galling and die wear. Dual phase (DP) 590 and 780 steels with galvanized (GI) and galvannealed (GA) coatings were investigated in the study. The results indicate that GI coatings tend to have better wear resistance than GA coatings. A better surface treated (Thermo-Reactive Diffusion Vanadium Carbide) die material was also identified to decrease coating galling and die wear in stamping AHSS.
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Zhang, W., Y. G. Liu, H. R. Gu, J. C. Jin, Y. Zhang, J. W. Li, and H. B. Wang. "Metallo-Thermo-Mechanical Coupled Analysis of the Influence of Key Process Parameters on the Quality of Hot Stamping Component." In The 2nd International Conference on Advanced High Strength Steel and Press Hardening (ICHSU 2015). WORLD SCIENTIFIC, 2016. http://dx.doi.org/10.1142/9789813140622_0047.

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Ali Ablat, Muhammad, and Ala Qattawi. "Finite Element Analysis of Origami-Based Sheet Metal Folding Process." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-67324.

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There are challenges in the conventional sheet metal folding for mass production; those are summarized by high tooling and energy costs and lack of dimensional accuracy. High cost per product is due to the need of specific manufacturing tools and equipment like dies and molds that are shape dedicated to certain product range and specifications. Lack of high accuracy is resulted from involved forming process, machine structure and springback effects in workpiece. Origami-based Sheet Metal (OSM) folding fabrication process has been utilized to overcome these challenges. This novel approach is an extension of the origami technique to sheet metal folding process and it requires creating numerous features along the bend line, called Material Discontinuities (MD). MD are fabricated by removal of material completely or partially through thickness direction of sheet metal along the bend line using laser cutting process or progressive stamping. MD can also be created by stamping where no material removal is present, rather stamping creates deformed pattern along the bend line to guide the folding. MD controls the material deformation during bending and results in reduced bending force, minimal tooling and machinery requirements. Despite the promising potential of OSM, there is little understating of the effect of the selected MD shape and geometry on the final workpiece, specifically this is of interest when comparing the energy and cost allocations for OSM with a well-establish process for sheet metal such as stamping. In this work, the effect of several types of MD on sheet metal folding process is investigated using Finite Element Analysis (FEA). In particular, wiping die bending of aluminum sheet with different MD shapes and geometries along the bend line is compared to the traditional sheet bending of final part in terms of stress distribution along the bending line and required bending force. FE simulations are carried out using structural and thermo-mechanical FE solver Code_Aster. Aluminum 2036-T4 is chosen as sheet metal material. Constitutive model in the simulation is J2 flow theory plasticity with isotropic hardening. The FEA results are validated by comparing it to the available empirical models in terms of bending forces. This study finds that the OSM technique reduced the required bending force significantly, which has important significance in energy and cost reduction. It also ranked the MD in terms of the required force to bend the same sheet metal type and thickness for further future investigation. However, the MD leads to localized high stress regions along the bending line, which may affect load-bearing capability of the final part. In addition, it may lead to cracks or fractures of sheet metal part in the high stress region, especially if MD are densely arranged along the bend line.
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Matthiesen, Gunnar, Hubertus Murrenhoff, Johannes Storz, and Alexander Braun. "Pressure Control for a Hot Gas Bulge Test Using Parallel On-Off Valves." In ASME/BATH 2017 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/fpmc2017-4239.

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Weight reduction is an ongoing trend in multiple industries. Especially in the mobility sectors, hot forming of sheet metal parts has become an alternative production process for high strength components. New material concepts, e.g., boron-manganese steels, enable the design of lighter parts at equivalent or even higher strength. During the preliminary process development phase detailed knowledge of the thermo-mechanical material properties of these sheet metals is required at elevated temperatures and high strain rates. Since hot tensile tests can only be evaluated up to comparably low strains, new test designs are needed to supply material parameters at elevated temperatures and higher strain rates. Therefore, the hot gas bulge test has been developed, that allows for such test conditions. In this paper, first the concept of the hot gas bulge test and the developed test bench are described. Opposed to standardized bulge tests, which use hydraulic oil as forming medium, the newly designed test uses gas as medium to account for the hot stamping conditions, i.e., temperatures of up to 950°C. As the forming speed has an increasing influence on the material behaviour at increasing temperatures, a closed loop control of the forming speed was developed. Since there are no proportional pneumatic valves available for the required pressure range, a parallel valve concept was chosen. By combining different valves, the characteristics of a larger proportional valve are imitated. A control algorithm was developed, that maps the required valves conductance into a valve combination to control the mass flow into the pressure chamber. The developed control system is presented and experimental results from the material test procedure are shown. These results reveal that the developed system is capable to track the required mass flow rate for low as well as high forming speeds up to a certain deformation when the deformation of the sheet becomes uncontrollable.
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