A study on life estimation of hot forging die |
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Authors: | Yohng-Jo Kim and Chang-Hyok Choi |
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Affiliation: | (1) Division of Mechanical Engineering and Automation, Kyungnam University, 449, Wolyoung-dong, Masan, Kyungnam, South Korea, 631-701;(2) Graduate School, Kyungnam University, 449, Wolyoung-dong, Masan, Kyungnam, South Korea, 631-701 |
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Abstract: | In this study, the forging die life was investigated using fatigue life and wear quantity, which are generally considered
for estimation of die life. The main aim is development of the equations to adapt finite element analysis to life estimation
for a hot forging die. The Archard’s model was used to estimate the wear life of the die and Goodman’s and Gerber’s equations,
using the stress-life method, were applied to estimation of the fatigue life. These techniques were applied to die life estimation
for the hot forging die of a ball joint socket used in an autovehicle system. Rigid-plastic finite element analysis was first
carried out for the forging process of the ball joint socket and then the elastic stress analysis was performed for the die
in order to obtain fundamental data for the prediction of fatigue life. The die stress analysis requires the deforming loads
of the workpiece to be translated into the contact loading of the die. In this case, the size of finite elements of the die
and the workpiece is important for good interpolation of the loading. Therefore, the influence of element sizes on the interpolation
results of the contact loading was also investigated. The wear volume of the die was measured using a 3-dimensional scanner
of probe type. It was found that the measurement had a good agreement with the results of the finite element analysis for
the die life estimation. |
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Keywords: | Forging die life Fatigue life Wear life Stress-life curve Goodman’ s and Gerber’ s equation |
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