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Abstract：
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The scratching mechanism of arc-welding hoop of circular cup stamping part made from 1Cr18Ni9Ti stainless steel in the course of its drawing is analyzed. It is definitely pointed out that the scratching of the arc\|welding hoop in the course of its drawing results from seven factors. Drawing scratching happens when four conditions are satisfied,which are that local heave exists on the blank surface, adherence between the blank and the die under high temperature and high pressure is produced, hard adherence burl is formed when the adherence is departed, and the hardness of the adherence burls are more higher than that of the blank surface. In order to prevent from the scratching phenomena, the following measures are introduced, such as using fine lubricant, increasing the finish of die surface, reasonably decreasing the compression stress in tangent direction of flange, increasing the concave die radius of rounded corner, keeping the surface of piece and die clear, making the material of the blank correct, especially making plastic isomerism of the blank material as low as possible, making nickel and titanium element's content enough, keeping anneal intenerating better, letting the mouth end of circular cup part of midst working procedure have a small flange with a rounded corner, eliminating the adherence burls on the die in time, changing the five times drawing of previous technology to thrice drawing and twice thinning spinning. The above measures are successfully used in practice.
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Funds：
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高等学校全国优秀博士学位论文作者专项资金资助项目(1 99930 )
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AuthorIntro：
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Reference：
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1 DonaldPeckner,IMBernsteinHandbookofstainlesssteelsMcGraw-HillBookCompany,1977
2 郭成,赵新怀冲压件废品的产生与防止200例北京:机械工业出版社,1994
3 崔忠圻金属学与热处理北京:机械工业出版社,1989
4 王孝培冲压手册北京:机械工业出版社,1990
5 肖景容,姜奎华冲压工艺学北京:机械工业出版社,1990
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