Transactions of Materials and Heat Treatment

Title：Improvement of stamping process to prevent drawing parts of car cushion from cracking

Authors： Liu Chi

Unit： Liuzhou Vocational & Techinical College

KeyWords： drawing part of car cushion stamping process fracture defects cracking punch drawing die

ClassificationCode：TG386

year,vol(issue):pagenumber：2014,39(3):20-24

Abstract：

Because the car cushion has many complex model surfaces，the fracture defects are often produced in drawing process. Aiming at the uneasy control of cracks for the car cushion in drawing process at two sites, the crack problem was solved by improved stamping process on the condition that part material must not be changed.The improved approach is that adding cracking punch on the drawing die which makes the cracks only exist in the parts of processing supplement or to be cutting,then the yield of products was assured,moreover, two types of cracking punch were introduced. By amplifying the round corner radius in drawing process, the part radius without crack is achieved finally in flanging and sizing process after trimming and piercing process.It is indicated by production practice that the drawing part of car cushion meets the technical requirements after the improvement of stamping process. At last，the good yield product was got, the validity of improvement was verified by the field production．

Funds：

2012年度广西高等学校一般资助科研项目（201203YB196）;柳州职业技术学院科研项目（2007A02）

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