Готові списки джерел за темами / Press-hydraulic method

Добірка наукової літератури з теми "Press-hydraulic method"

Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 31 травня 2022

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Статті в журналах з теми "Press-hydraulic method"

Zhu, Peihao, Lianhong Zhang, Rui Zhou, Lihai Chen, Bing Yu, and Qizhi Xie. "A Novel Sensitivity Analysis Method in Structural Performance of Hydraulic Press." Mathematical Problems in Engineering 2012 (2012): 1–21. http://dx.doi.org/10.1155/2012/647127.

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Анотація:

Sensitivity analysis plays a key role in structural optimization, but traditional methods of sensitivity analysis in strength and stiffness are time consuming and of high cost. In order to effectively carry out structural optimization of hydraulic press, this paper presents a novel sensitivity analysis method in structural performance of hydraulic press, which saves a great deal of time and design costs. The key dimension parameters of the optimization of design variables, which remarkably impact on the structural performance of hydraulic press, are efficiently selected. The impact order of various sensitivity parameters in strength and stiffness of machine tools is consistent with the sensitivity ranking of regression analysis. The research results provide the basis for the hydraulic machine design and references in research of machine tools and equipment.

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Zhong, Jun, Kai Zhao, Zhi Feng Liu, and Hong Bao. "Redesign Method of Hydraulic Press’s Moving Beam." Advanced Materials Research 889-890 (February 2014): 198–202. http://dx.doi.org/10.4028/www.scientific.net/amr.889-890.198.

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In order to achieve the goal of saving energy and materials, hydraulic sheet metal drawing press are selected as the research objects. Testing technologies are used to obtain hydraulic press's distribution ratio of forming craft's energy consumption so that the importance of moving beam's structure optimization is revealed. Finite element method is used to comprehensively analyze the stress and displacement activity of original beam, mapping out the place of redundant material in the structure. Then, moving beam's structure is optimized by the method of Topology Optimization, and got redesigned on this basis. Thus, the redesigned hydraulic presss moving beam not only satisfies the basic requirement of safety and reliability, but also reduces 433.19 t carbon emissions during the service life of hydraulic press.

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Chen, Hui, Jian Ping Tan, Jin Li Gong, Xian Yue Cao, and Ji Neng Zhou. "Research on Mathematic Model and Measuring Method of Moving Beam Attitude in Large Forging Hydraulic Press." Applied Mechanics and Materials 128-129 (October 2011): 1213–16. http://dx.doi.org/10.4028/www.scientific.net/amm.128-129.1213.

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The moving beam of large forging hydraulic press is taken as a research object. A mathematic model of moving beam’s six freedom degrees attitude is established. According to the mechanical feature and special working conditions of large forging hydraulic press, a non-contacted method for moving beam attitude measuring which based on machine vision is proposed. The basic principle and composition of the system are introduced. The system is applied in 300MN large forging hydraulic press, and large amounts of monitoring data are collected which confirm that the measuring method is effective. The research result is helpful for the safety operation and maintenance of large forging hydraulic press.

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Han, Jiang, Hai Jin Huang, Lian Xia, and Hua Zhai. "Fault Diagnosis Method for Automotive Panel Processing Equipment Hydraulic System Based on Rough Sets - Neural Networks." Key Engineering Materials 522 (August 2012): 546–51. http://dx.doi.org/10.4028/www.scientific.net/kem.522.546.

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The application, which the intelligence is used in the fault diagnosis, is the main direction of research currently, especially in the fault diagnosis of large mechanical equipment. In order to improve hydraulic system failure diagnosis of high-speed deep drawing hydraulic press, reduce the efficiency and accuracy of difficulty diagnostic staff. By using rough sets theory combining neural network and the method of large NC hydraulic press, hydraulic system fault diagnosis of diagnosis. This paper established based on rough set - neural network fault diagnosis model, and the following hydraulic cushion hydraulic system as an example, the diagnosis in establishing the fault table based on the rough set theory to fault table attribute reduction and generating rules, will rule input to the BP neural network was trained learning. Get in neural network after the test data repository and simulation. Test results show that the method for the diagnosis of high-speed deep drawing hydraulic press hydraulic system fault is effective.

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Sanada, K. "A method of designing a robust force controller of a water-hydraulic servo system." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 216, no. 2 (March 1, 2002): 135–41. http://dx.doi.org/10.1243/0959651021541507.

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Анотація:

Robust force control of a water-hydraulic servo system is discussed. The system treated in this paper is a model of a moulding press used for a fabrication process of large-scale integration packages. The whole surface of a wafer is covered with a thin plastic layer by the press. The performance of force control is important to obtain sufficient quality. The press is driven by a ram cylinder and a water-hydraulic servo valve. Considering the uncertainty caused by the flow characteristics of the valve in the overlap region and the mechanical stiffness of the press, a method of designing a robust force controller is proposed by applying H∞ control theory. Qualitative evaluation of modelling error is the key to the design of the robust controller. The performance of the robust controller is examined using an experimental water-hydraulic servo system set-up. It is illustrated how the system responses are influenced by the weighting function parameters of H∞ control theory.

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Li, Z. H., Y. L. Chen, S. Li, and D. S. Bi. "Predict Stiffness of Hydraulic Press with Movable Eccentricity Loading Considering Uncertainty by Monte Carlo Simulation." Materials Science Forum 697-698 (September 2011): 721–25. http://dx.doi.org/10.4028/www.scientific.net/msf.697-698.721.

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The stiffness analysis method considering uncertainty parameters of frame hydraulic press with movable eccentricity loading in the early design stage was proposed. The mathematical analytical stiffness of the upper beam with movable eccentricity loading was built. The adaptive Monte Carlo Method was used to calculate the interval of the stiffness with random parameters. The result shows that the stiffness appears higher when the eccentricity increasing. The approach has been tested by measuring the stiffness of a 10000kN frame hydraulic press and a 15000kN frame hydraulic press.

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Zhu, Pei Hao, Lian Hong Zhang, Bing Yu, and Qi Zhi Xie. "Tie Rod Preload Analysis of a 100MN Hydraulic Press." Applied Mechanics and Materials 121-126 (October 2011): 3632–36. http://dx.doi.org/10.4028/www.scientific.net/amm.121-126.3632.

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The classical preload design method of prestressed frame of hydraulic presses is based on the assumption that the beams of the frame are rigid, which is not agree with practice. In order to eliminate the unbalance load of the frame of a 100MN hydraulic press due to improper prestressing, tie rod preload distribution in prestressing of the frame is researched with respectively mechanics of materials and the finite element methods. According to mechanics of materials and finite element analysis results, reasonable tie rod preloads and sequence of preloading are obtained and the unbalance load of the frame of the hydraulic press is solved. It also provides references for the preload design of prestressed frame of hydraulic presses.

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Yu, H. B., Y. C. Li, and Chun Zhang. "Conceptual Design for Upper Beam of Hydraulic Press." Materials Science Forum 697-698 (September 2011): 414–19. http://dx.doi.org/10.4028/www.scientific.net/msf.697-698.414.

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Анотація:

Conceptual design method for the upper beam of the press is proposed. Based on the technical parameters (nominal load and tablesize) and press structural scheme (number and layout of the hydraulic cylinder), simplified mechanical model of upper beam is established and then the conceptual design model is derived. According to the model, conceptual prototype with equivalent moment of inertia of the cross section is achieved. The structure prototype of upper beam is then obtained based on the conceptual prototype by introducing the design rules and experience and solving an optimization model. The method is applied to the structure prototype design of upper beam of a 100MN hydraulic press.

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Huang, Zhi Cheng, and Ze Lun Li. "Studies on the Influence of the Frame Structure’s Deformation of the Automatic Hydraulic Tile Press on Energy Consumption." Applied Mechanics and Materials 103 (September 2011): 41–45. http://dx.doi.org/10.4028/www.scientific.net/amm.103.41.

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The influence of the frame structure’s deformation of the automatic hydraulic tile press on energy consumption has long been neglected. In this paper, a case study in two common beam-column types hydraulic automatic tile press, get the deformations of the columns produced by the tensile by using the finite element method, and then calculate their energy consumption due to deformations. Through analysis and comparison, provide a reference for future design and selection of the hydraulic automatic tile press.

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Chen, Hui, Jian Ping Tan, Jin Li Gong, Zhao Qiang Shu, Xian Yue Cao, and Ji Neng Zhou. "Design of New Condition Monitoring System and Data Analysis in Large Forging Die Hydraulic Press." Advanced Materials Research 311-313 (August 2011): 1546–50. http://dx.doi.org/10.4028/www.scientific.net/amr.311-313.1546.

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Анотація:

The mechanical characteristics and extremely hard working conditions of large die hydraulic press are considered. The limitations of traditional condition monitoring method are analyzed. A new condition monitoring system which consists of a digital and non-contact method for measuring column stress and a digital method for measuring moving beam’s spatial altitude based on machine vision is proposed. The basic principle and composition of the system are introduced in detail. The system is applied in 300MN large forging hydraulic press, and large amounts of monitoring data are collected. Data analysis is carried out. The laws of column stress distribution in different working conditions are found out. At last, some recommendations are proposed which is helpful for the safety operation and maintenance of large hydraulic press.

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Більше джерел

Дисертації з теми "Press-hydraulic method"

Бобко, Святослав Олександрович. "Експериментальна установка для перевірки герметичності хірургічних швів порожнистих органів". Bachelor's thesis, КПІ ім. Ігоря Сікорського, 2019. https://ela.kpi.ua/handle/123456789/28700.

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Анотація:

Дипломна робота налічує 72 сторінок, 34 ілюстрацій, 19 таблиць та 20 джерел за переліком посилань. Метою дипломної роботи є створення методу перевірки порожніх органів на герметичність хірургічного та зварного шва. У дипломній роботі був зібраний прототип установки який дозволяє перевірити на герметичність зварений шов і хірургічний, а також з'ясувати який шов більш стійкий до зовнішніх подразників. Для досягнення мети ДР були поставлені наступні завдання: 1. Провести огляд наукової літератури з обраної тематики. 2. Проаналізувати види хірургічних і зварних швів та вимоги до них. 3. На основі літературних даних порівняти існуючі контрольні методики та вибрати оптимальну для послідуючої технічної реалізації. 4. Виготовити прототип, який дає можливість оперативно перевірити хірургічний шов на герметичність. 5. Протестувати пристрій з використанням запропонованої методики на хірургічних швах різних типів.
Thesis contains 72 pages, 34 illustrations, 19 tables and 20 sources according to the list of references. The purpose of the thesis is to create a method for checking empty bodies for the tightness of the surgical and weld seam. In the thesis the prototype of the installation was made which allows to check on the tightness of the welded suture and surgical, as well as to find out which seam is more resistant to external stimuli. To achieve the goal of DR were sett he following objectives: 1. To conduct a review of scientific literature on selected topics. 2. To analyze the types of surgical and weld seams and requirements fort hem. 3. Based on the literature data, compare the existing control techniques and choose the optimal for the subsequent technical implementation. 4. To make a prototype, which makes it possible to quickly check the surgical suture for tightness. 5. Test the device using the proposed method on surgical sutures of different types.

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de, Figueiredo Tomás Diogo. "Identification of failure modes to apply condition monitoring methods on critical components of a hydraulic stamping press machine." Thesis, Luleå tekniska universitet, Drift, underhåll och akustik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-80040.

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Анотація:

This thesis is the result of a four months internship in a company that aims to transform technology into value for industry. The industries face a wide range of engineering challenges. The requirements and competitiveness of the industry demands high dependability of the assets. During operations of hydraulic stamping presses, unexpected failures may happen, affecting the production and the overall equipment effectiveness, and therefore, the objectives of the company. It might have serious repercussions, both monetary and reputational, this last one normally difficult to recover from. That is the reason why it is important to find solutions which can prevent these situations to happen. One of the challenges with hydraulic press stamping machines is that there are multiple failure modes that affect the machine dependability. There is a big variety of sensor technologies available in the market, that can be used to monitor the health condition of the hydraulic stamping press machines, providing decision makers with reliable information to coordinate maintenance activities. However, it is required to the users to know the specific condition monitoring methods for each failure mode. The present thesis has the purpose to identify and propose strategies in order to leverage the dependability of hydraulic stamping press machines, to achieve the performance objectives. It serves also as base for the creation of future maintenance plans. The first step is to understand the system operation under study, and then identify failure modes that might happen in the asset. The next step is to select and suggest condition monitoring methods to monitor the machine’s failure modes. Based on this information, excellence in the planning of maintenance and production can be achieved. The Reliability Centered Maintenance (RCM) method and the Failure Modes, Effect and Criticality Analysis (FMECA) were used in present thesis to assess failure modes, criticality and prioritize maintenance interventions. The thesis work presents condition monitoring methods for the analysed subsystems of the stamping press machine. The failure analysis of the subsystems and the proposed condition monitoring methods were based on the related literature and technical staff recommendation. How proposed condition monitoring methods can be complemented with further analysis is discussed. A qualitative approach was used to rank the selected subsystems and components based on their criticality. As a conclusion, the slide of the guide rail was considered the most critical component. The reason is that all the press operation is based on force and guiding precision.

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Тези доповідей конференцій з теми "Press-hydraulic method"

Jia, Chao, Jiaqi Wei, Enzeng Dong, Xuewei Gao, and Haocheng He. "A Discrete-Time Sliding Mode Control Method for Multi-Cylinder Hydraulic Press." In 2020 IEEE International Conference on Mechatronics and Automation (ICMA). IEEE, 2020. http://dx.doi.org/10.1109/icma49215.2020.9233757.

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Jirasko, Jakub, Antonin Max, and Radek Kottner. "A Coupled Temperature-Displacement Numerical Analysis of Hydraulic Press Workspace." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-65480.

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Анотація:

The analysis is performed on a hydraulic press which is intended for use in the automotive industry and is a part of a production line. The final phase of manufacture of interior and acoustic parts takes place in this press. These interior and acoustic parts are made of sandwich fabric which is inserted into the heated mould of the press and by treatment with a defined pressure (or, more precisely, a defined compression) and temperature, it is formed into its final shape. This press has a frame with four columns and it is not preloaded. Two double acting hydraulic cylinders placed on an upper cross beam exert the compressive force. Due to continuously increasing demands on the accuracy and quality of products not only in the automotive industry, it is necessary to ensure compliance with the accuracy of certain values of machine operation. Especially in this case, the value of accuracy substantially depends on the clamping plates of the press, for which a certain value of flatness is required, both at room temperature and at elevated temperatures. To achieve this accuracy, it is necessary to guarantee sufficient stiffness of the machine to resist the pressing force with the smallest deformation possible. Another crucial factor affecting the accuracy of the machine is heating of the heated clamping plates. Unequal heating of parts of the frame causes additional deformation that has to be quantified and eliminated. The main aim was to verify the design of the press by numerical computation and gather knowledge for modifying the topological design of the press so that it fulfils the required customer parameters of flatness and parallelism for different types of loading. A computational model of the press was created for the numerical solution of a coupled temperature-displacement numerical analysis. The analysis was performed using the finite element method in Abaqus software. The press is symmetrical in two orthogonal planes and the load of the press is considered to be centric. On the basis of these two factors it was possible to carry out the analysis by considering only a quarter of the press. The analysis was used to investigate the effects of static and combined loads from the pressing force and heat on the press. The influence of a cooling circuit located in the press frame for the reduction of frame deformation (and deformation of clamping plates) was investigated. Contacts were defined among individual parts to ensure the computational model had characteristics as close as possible to the real press. The analysis was solved as stationary, on the basis that the cooling of the tool between individual pressing cycles is negligible. The insulating plates are made of a particulate composite material which was considered to have isotropic properties depending on the temperature. For strength evaluation of composite materials all individual components of the stress tensor were examined according to the maximum stress criterion. Hook’s law was considered to be valid for the metallic materials. Von Mises criterion was used to evaluate the strength of the metallic materials. The geometry of the press was discretized using 3D linear thermally coupled brick elements with 8 nodes and full integration (C3D8T). There were approximately 174,000 elements in total. Design procedures for designing a press frame with higher work accuracy (flatness) were proposed with the example of the simplified model of the press table. With these methods it is possible to achieve times higher accuracy than is achieved with conventional method.

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Chen, Hui, Jianping Tan, and Jinli Gong. "A Digital Method for Detecting Hydraulic Press Column Stress Based on Profibus-dp Fieldbus." In 2009 International Conference on Measuring Technology and Mechatronics Automation. IEEE, 2009. http://dx.doi.org/10.1109/icmtma.2009.646.

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Deadman, Jason. "Analysis of a Bolted Joint Failure in a Hydraulic Press." In ASME/JSME 2004 Pressure Vessels and Piping Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/pvp2004-2237.

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Анотація:

Micrographic inspection, acceleration tests, Finite Element Analysis and detailed fatigue failure calculations for combined static and dynamic loadings, were used in determining the cause of failure, and an acceptable repair solution, for a critical bolted joint. The bolted joint holds together the piston and ram within a hydraulic press. The press had been in operation for eleven years when the failure occurred. As the press is used in a critical process operation, a repair solution and future maintenance strategy was required that would minimize the possibility of future failures and permit maintenance during planned outages. This paper discusses the method that was followed to arrive at an acceptable solution.

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Cruz, J. M., and J. A. Ferreira. "Testing and Evaluation of Control Strategies for a Prototype Hydraulic Press." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-42624.

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The work that this paper describes is the attempt to safely optimize, test and evaluate the performance of advanced strategies for the control of hydraulic systems. The method proposed is to use a computer model of a prototype hydraulic press to develop, optimize and test various controllers. The same tests are then repeated on the actual prototype of the press. The results of the experiments are compared to evaluate the accuracy of the model, the performance of the controllers, and the validity of the method.

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Shao, Xiaodong, Liangkuan Zhu, and Yaqiu Liu. "SMDO-based backstepping terminal sliding mode control method for hot press hydraulic position servo system." In 2015 27th Chinese Control and Decision Conference (CCDC). IEEE, 2015. http://dx.doi.org/10.1109/ccdc.2015.7161811.

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Zhang, Qiang, Jianhua Wei, Jinhui Fang, and Xiaoyi Wang. "High Performance Pressure Control for the Hydraulic Press Based on the Soft Relief Fuzzy PID Controller." In ASME/BATH 2015 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/fpmc2015-9586.

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Анотація:

A soft relief controller is proposed to solve the pressure overshoot problem of the hydraulic press. Whose basic idea is to make the proportional relief valve open in advance to limit the pressure rise rate to reduce the pressure overshoot. What’s more, the fuzzy PID controller is introduced to improve the control performance. Based on the mechanism modeling method, the complete mathematical model of the hydraulic press is established to conduct the simulation research. The correctness of the mathematical model is proved through experiments. Simulation and experiment results demonstrate that the soft relief fuzzy PID controller which combines the soft relief controller and the fuzzy PID controller can guarantee the hydraulic press has no overshoot during the pressure building-up process. Furthermore, a high steady precision is achieved and the adjust time can meet the demands of most hydraulic presses.

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Chen, Hui, Jianping Tan, Yufeng Peng, and Lingyun Quan. "A Digital and Non-contact Method for Detecting Moving Beam Eccentricity in Forging Hydraulic Press Based on Machine Vision." In 2010 International Conference on Measuring Technology and Mechatronics Automation (ICMTMA 2010). IEEE, 2010. http://dx.doi.org/10.1109/icmtma.2010.751.

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Meoni, Francesco, Adrian Lutey, Alessandro Fortunato, and Marco Carricato. "A Multi-Axis Deep Drawing Servo Press With Non-Overconstrained Architecture." In ASME 2014 International Manufacturing Science and Engineering Conference collocated with the JSME 2014 International Conference on Materials and Processing and the 42nd North American Manufacturing Research Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/msec2014-3970.

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Анотація:

Servo actuated presses can provide maximum pressing force at any slide position in the same manner that hydraulic presses do, while offering several benefits in terms of precision, energy conversion efficiency and simplicity due to their lack of hydraulic circuitry and oil. Several press builders have developed electric-spindle actuated presses; however, issues relating to multi-axis architecture have been neglected. The present study proposes an innovative method of avoiding overconstrained architecture by implementing a kinematic mechanism that connects multiple servo axes to one slide. Servo axis design is developed by creating a dynamic model of a kinematic chain composed of a servo-motor, gearbox reducer and ball screw transmission. A study of a biaxial industrial servo press prototype with non-overconstrained architecture, currently under construction, is presented as proof of concept. It is shown that such a non-overconstrained multi-axis press can be constructed from commercially available components, achieving high energy efficiency at high load with relatively simple construction.

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Schulze, Tobias, Jürgen Weber, Knut Großmann, Lars Penter, and Christer Schenke. "Hydraulic Die Cushions in Deep Drawing Presses: Analysis and Optimization Using Coupled Simulation." In ASME/BATH 2015 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/fpmc2015-9623.

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Анотація:

The scientific paper proposes a method to analyze and optimize the drawing press and the deep drawing process with a virtual model. It focuses on hydraulic multi-point die cushions since they offer a wide range of possible adjustments and a high potential to increase production quality and efficiency. The operator can apply individual die cushion cylinder forces to the blankholder which enables the control of the forming process and manual die spotting can theoretically be reduced to a minimum. Utilizing the virtual model can improve the drawing press’ behavior and significantly reduce the set-up time for drawing presses during try-out of new tools or when tool sets are transferred to a different machine. The paper presents a system simulation model of a deep drawing press including its mechanics, hydraulics, and control. It serves as a basis for developing an advanced control system which improves system performance with potentially higher slide speeds, and therefore, a more efficient production. Another aspect in the paper is the development of a coupled simulation consisting of the machine model and a process model. This includes the elasto-static as well as the dynamic behavior of the drawing press and allows for simulations with the highest possible level of detail. The model was used to determine individual set forces for the die cushion cylinders which allowed for the production of sound quality parts without manual die spotting.

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