Proceedings of the Korean Society for Technology of Plasticity Conference (한국소성가공학회:학술대회논문집)
- 2004.10a
- /
- Pages.338-341
- /
- 2004
Dimensional accuracy and ejecting stage in cold forging
냉간단조의 Ejecting 공정이 치수정밀도에 미치는 영향
Abstract
The dimension of forged part is different with the die dimension by the various effects, such as, elastic deformation and thermal effect. And, the difference amounts are not same according to the forging conditions, for example, forging mode, flow stress, etc. Therefore, the use of FEA is effective to predict and update the required die dimension. However, the variables for FE simulation are also as many as variables in the experiment. The variables give very much effect to the accuracy of FE results. At first, the material model is very deeply affected to the estimated dimension of forged part. And the considering of loading and ejecting stages is also important to increase the dimensional accuracy. The experiment and FEA are performed to investigate the dimensional changes and accuracy in cold forging. Two types of upsetting are used to survey the effects of forging mode and stages.
Keywords
- Closed Die Upsetting;
- Open Die Upsetting;
- Cold Forging;
- Dimensional Changes;
- Loading;
- Unloading;
- Ejecting