Proceedings of the Korean Society for Technology of Plasticity Conference (한국소성가공학회:학술대회논문집)
- 1999.03b
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- Pages.98-101
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- 1999
A Study on Buckling and plastic Instable Flow with Kinematic Hardening
이동 경화를 고려한 좌굴 및 소성 불안정 유동에 관한 연구
Abstract
The plastic instable flow phenomenon happens in practical forming process I. e. upsetting backward extrusion piercing indentation. And also it is difficult to control precisely the shape and dimensions of forming process. It is found that instabilities of the process are mainly connected with imperfection in the lubrication billet eccentricity inclined punch alignment. In view of the direct relationship between instable material flow and quality defects of the products and it is for better control of forming operation we should necessarily find out their phenomena. In this study we used the friction disturbance due to inclined punch angle and introduced the method considering kinematic hardening effect Analysis of upset forging is carried out using the rigid plastic FEM and slab method with eccentricity.
Keywords
- Inclined punch angle;
- Friction disturbance;
- Eccentricity;
- Plastic instable flow;
- Kinematic hardening;
- Upset forging;
- Rigid-plastic FEM