• Title/Summary/Keyword: Finite Element Analysis of Forging

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POSFORM-A CAE System for Analysis and Design of Forging Processes (POSFORM - 단조공정 해석 및 설계용 CAE 시스템)

  • 황상무;전만수;류성룡;문호근
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 1994.10a
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    • pp.95-104
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    • 1994

  • A finite-element based forging simulator, POSFORM, for automatic computer simulation of two-dimensional and axisymmetric forging processes was introduced in this paper. POSFORM is characterized by solution accuracy, user-friendliness, applicability and extensibility. Basic principles and capabilities of the program were introduced. Several application examples found in cold or hot forging companies of automotive or mechanical parts were given.

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A Manufacturing Process analysis of Large Exhaust Valve Spindle considering Microstructure Evolution (미세조직 변화를 고려한 대형 배기밸브 스핀들 제조공정 해석)

  • Jeong Ho-Seung;Cho Jong-Rae;Park Hee-Cheon
    • Journal of Advanced Marine Engineering and Technology
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    • v.29 no.8
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    • pp.938-945
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    • 2005

  • The microstructure evolution in hot forging process is composed of dynamic recrystallization during deformation as well as grain growth during dwell time. Therefore, the control of forging parameters such as strain, strain rate. temperature and holding time is important because the microstructure change in hot working affects the mechanical properties. Modeling equations are developed to represent the flow curve. grain size. recrystallized volume fraction and grain growth phenomena by various tests. The developed modeling equations were combined with thermo-viscoplastic finite element modeling to predict the microstructure change evolution during hot forging process. The large exhaust valve spindle (head diameter of 512mm) was simulated by closed die forging with hydraulic press and cooled in air after forging. The preform was heated to each 1080 and 1150$^{\circ}C$. Numerical calculation was performed by DEFORM-2D. a commercial finite element code. Heat transfer can be coupled with the deformation analysis in a non-isothermal deformation analysis. In order to obtain the fine and homogeneous microstructure and good mechanical properties in forging. the FEM would become a useful tool in the simulation of the microstructure development. In forging, appropriate temperature, strain and strain rate and rapid cooling are required to obtain the fine grain microstructure The optimal forging temperature and effective strain range of Nimonic 80A for large exhaust valve spindle are about 1080$\∼$l120$^{\circ}C$ and 150$\∼$200$\%$.

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A Study on the Prediction of Fatigue Life in Die (금형의 피로수명 예측에 관한 연구)

  • 여은구
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.8 no.4
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    • pp.87-92
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    • 1999

  • Generally the life of die is limited by fatigue fracture or dimensional inaccuracy originated from wear. In this paper to predict the fatigue life of die the stress and strain histories of die can be predicted by the analysis of elastic-plastic finite element method and the elastic analysis of die during the process analysis of workpiece. Also the stress-life curve of die material can be obtained through experiment. With the above to재 facts we propose the analysis method of prediction fatigue life in die,. In the proposed model the analysis of elastic-plastic finite element method for material is carried out by using ABAQUS. Surface force resulted from the contacting border of the die and workpiece is transformed into the nodal force of die to implement elastic analysis. besides the proposed analysis model of die is applied to extrusion die and forging. die.

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Development of Web-based Virtual System to Simulate Forging Operation (Web 기반형 단조 가공 가상 생산 시스템 개발)

  • Lee, Young-Seok;Hwang, Ho-Jin;Park, Man-Jin;O, Jae-U;Jang, Dong-Young;Kim, Ji-Pyo;Na, Kyung-Hoan
    • IE interfaces
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    • v.14 no.1
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    • pp.1-8
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    • 2001

  • This paper presented a web-based virtual system to simulate forging operation. The system utilized simulation techniques of Finite Element Method (FEM) to analyze the forging process and Virtual Reality Modeling Language (VRML) to visualize the simulation results in the web. The analysis using FEM could show mechanical information such as stresses and deformation profiles of a specimen during forging process and the analysis results were transferred into virtual space using VRML. Since the forging machine and specimen were modeled using Java and VRML, the forging machine and analysis results were browsed and integrated on the web that is interfaced to users through EAI to show the whole forging simulation. The developed system realized the working environment virtually so that education and experiment could be performed effectively even on the PC.

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