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一、前言生产中发现,冷拔高速钢丝的高频热塑性较差,用热轧材扭轧钻头时,几乎不裂。但经过冷拨、退火之后再扭轧时,刃带易出现裂纹。北京量具刃具厂在生产中还发现,如果用某规格的冷拔高速钢丝扭轧钻头裂纹率较高时,就把表面磨去一层(即所谓“剥层”措施),改小规格再轧,裂纹率往往能下降不少。这些情况提醒我们考虑:为什么冷拔钢丝的热塑性比相应热轧材的要差?为什么去掉一层以后能使热塑性得到改善:经过冷拔之后,在钢丝表面上究竟产生了什么缺陷、经过退火不能消除、而对热塑性产生了危害作用?为了研究这些问题,我们进行了一系列试验。
First, the preamble found in production, high-frequency cold-drawn high-frequency wire thermoplastic poor, with hot-rolled material twist drill bit, almost no crack. However, after cold dial, annealing and then twist, the edge prone to cracks. Beijing measuring tool cutting plant also found in the production, if the specifications of a cold drawn high-speed wire twist drill bit crack rate is high, put the surface to a layer of grinding (the so-called “delamination” measures), change the size of the small rolling , The crack rate can often drop a lot. These situations remind us to consider why the cold drawn wire is less thermoplastic than the corresponding hot rolled material and why the thermoplasticity is improved after the layer has been removed: what defects have been produced on the wire surface after cold drawing, Elimination, which has a detrimental effect on the thermoplastic? In order to study these issues, we conducted a series of experiments.