金属学报  1977, Vol. 13 Issue (z1): 129-176

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冷挤压技术的应用研究中几个问题

No Author

上海交通大学铸压教研组

SOME PROBLEMS CONCERNING THE APPLICATION OF COLD EXTRUSION

The Forging and Stamping Faculty; Shanghai Chiaotung University

No Author. 冷挤压技术的应用研究中几个问题[J]. 金属学报, 1977, 13(z1): 129-176.
. SOME PROBLEMS CONCERNING THE APPLICATION OF COLD EXTRUSION[J]. Acta Metall Sin, 1977, 13(z1): 129-176.

摘要 参考文献 相关文章 Metrics 全文: PDF(4794 KB)   摘要: 我国冷挤压技术在社会主义建设中已发挥良好的作用,多种难于变形的金属已能冷挤压成几何形状复杂的零件。 在冷挤压过程中,模具要使被挤压的材料变形,被挤压的材料反作用于模具以反抗变形。变形与反变形这是一对矛盾,自始至终规定着冷挤压过程的本质。 我国工人对提高冷挤压许用变形程度作出了贡献,在生产实践中,巳能使单位挤压力在一定条件下达到300公斤/毫米~2,而且凸模寿命达到五万次,凹模寿命达到二十万次以上。 凹模设计,根据实践经验的总结,并从应力集中的理论分析,采用“未裂先分”的原则,将原来破裂的整模改为分割型的凹模,模具寿命从此极大提高。 本文还列举了冷挤压中挤镦联合工艺、复合挤压与刚性平移、不锈钢温热挤压等实例,以及探索利用冷挤压工艺特点发展代用材料的可能性。 Abstract：In China, the application of cold extrusion has been very rapid. Severalkinds of hard metal has been successfully cold-extruded into parts of complicatedshapes. Evidently, the technology of cold extrusion will play an ever-increasingimportant role in our socialist construction. During cold extrusion, the die exerts a high pressure on the material to beextruded and force it to deform whereas the material exerts a reaction on thedie to resist it being deformed. Deformation and resistance against deformationare two contradictory aspects which determine the nature of the process of coldextrusion from beginning to end. However, attention must be drawn to thetransformation of the contradiction. For example, the difference of the flowingrates of metallic particles usually becomes the principal aspect of the contradic-tion when pure aluminium or unsymmetrical steel parts to be slightly deformedare cold-extruded. Workers in China have made contributions to the raising of the allowabledeformation extent, In their actual productions, extrusion pressure may reach,under some circumstances, as high as 300 kg/mm~2, under which, punches canstill be used 50, 000 times and dies 200, 000 times before they are worn out. Based on our experiences gained in actual production, and on the theory ofconcentration of stresses, the principle of "dividing dies before cracking" hasbeen adopted in designing dies, which may considerably prolong their effective life. This paper describes the combined technology of extrusion-upsetting in coldextrusion and the combined extrusion of stainless steel. It seems that the correctchoice of substitute materials suitable to the characteristics of cold extrusioncould make the cold extrusion more promising in its application than ever before.      服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 44.8K 链接本文: https://www.ams.org.cn/CN/      或      https://www.ams.org.cn/CN/Y1977/V13/Iz1/129 No related articles found! Viewed Full text Abstract Cited   Shared      Discussed