Research on the Shrinkage Cavity Defect of the Extruded Boss in Fine Blanking Process

Abstract:

The shrinkage cavity defect of the extruded boss is harmful to the quality of fine blanking workpiece and process. To suppress the shrinkage cavity defect, firstly, the boss extrusion is simulated to analyze main features of metal flow and the causes of the shrinkage cavity defects; secondly, some parameters affecting the material flow, such as the size of die and punch, blank holder force, friction coefficient, sheet thickness and counter force, are studied to figure out their influences on the depth of shrinkage cavities respectively; finally, the process parameters of a special workpiece are selected according to research results above, and experiment verified that the selected parameters can suppress the shrinkage cavity defect pertinently. In the paper, the shrinkage cavity defect is systematically studied for the first time, and this provides the base to design and optimize the extruded boss feature in fine blanking process.

• Periodical: Advanced Materials Research (Volumes 314-316)
• Pages: 695-702
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.314-316.695
• Online since: August 2011
• Authors: Jian Lan, Yong Zhang, Chang Peng Song, Lin Hua
• Keywords: Blank Holder Force, Boss, Counter Force, Depth of Shrinkage Cavity, Friction Coefficient (FC), Sheet Thickness, Size of Die and Punch

References

[1] Shihong Zhang, Lixin Zhou and Zhongtang Wang: Journal of Plasticity Engineering, Vol.15 (2008), No.2, p.31. In Chinese.

[2] Ji Eon Park, Hyung Rae Kim, Sang Ho Ahn and Young Won Chang: Met. Mater. Int., Vol. 15, No. 3 (2009), p.515

[3] Zhiwen Zhu and Shidun Wu: Journal of North Western Polytechnical University, Vol.5 (1987) No.1, p.29. In Chinese.

[4] Xincun Zhuang, Hua Xiang and Zhen Zhao: Eleventh Annual Meeting of the National Mechanical Engineering, (Shanghai, China, October 24, 2009), p.90. In Chinese.

[5] Shenglin Liu: Research on fine blanking extrusion compound forming of sheet(MS., Wuhan University of Technology, China 2007).P.21. In Chinese.

[6] Feng Li, Shijian Yuan and Zhubin He: Materials Science and Technology, Vol.15 (2007) No.1, p.15. In Chinese.

[7] Yunzhen Liu, Yaozhong Zhang, Quanshui Fang, Aipin Wang and Xue Lin:Die & Mould Manufacture, Vol.6 (2006) No.10, p.8. In Chinese.