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摘要：
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分析了工件挤压过程中折叠缺陷产生的原因是由于余料太薄引起的缩尾性折叠,并分别对增厚坯料法、反作用力法和正反两步挤压法进行了分析比较。结果表明:采用增加坯料厚度的方法来防止折叠不仅增加了材料的浪费,也会增大后续的机加工量,是不经济的;反作用力法容易引起金属的畸形变形;而正反两步挤压法能够有效地防止活塞销顶部金属对流的情况,避免了活塞顶表面折叠的产生。
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The reason of thin remainder for causing extrusion funnel defect was analyzed. Three methods including increasing stock thickness, the counterforce and the backward and forward combined extrusion were analyzed. The results show that increasing stock thickness way not only wastes the material, but also increases subsequent machining-work, so it is uneconomical;and the counterforce way tends to cause abnormal deformation;while the backward and forward combined extrusion way can avert the convection of the metal on the top of the piston pin hole, and avoid the extrusion funnel defect on the surface of the piston-crown efficiently.
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基金项目：
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作者简介：
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参考文献：
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[1]贾俐俐.挤压工艺及模具[M].北京:机械工业出版社,2004.
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[4]俞汉清,陈金得.金属塑性成形原理[M].北京:机械工业出版社,1999.
[5]温景林,丁桦,曹富荣,等.有色金属挤压及拉拔技术[M].北京:化学工业出版社,2007.
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