钎焊金刚石/cBN砂轮基体工艺方法初探

Preliminary approach for process methods on the brazing diamond/CBN grinding wheel base

针对目前国内制作钎焊金刚石/cBN砂轮的几种工艺方法,分析了其中存在的优缺点。根据工厂试验中出现的实际问题:焊接的温度对砂轮基体硬度影响较大,进而影响了对精度的保持,文章指出了寻找合适基体材料的方法。为解决高温钎焊对基体的影响提供了一个较好的样本。要满足cBN/金刚石砂轮基体的力学性能需要,建议砂轮基体采用40Mn2这种材料,在700℃左右回火,其硬度可以达到HRC38左右,能够满足高速磨削和高精度磨削的要求。

According to several process methods on manufacturing the brazing diamond/ CBN grinding wheel in the domestic market currently, the advantages and disadvantages of these methods are analyzed in this thesis. In accordance with the actual problem occurred during factory tests： the welding temperature affects severely hardness of the grinding wheel base, and accordingly affects the accuracy consistency, a method for finding out a suitable base material is presented in the paper, and thus a better sample is offered to solve the effect problem of the high-temperature brazing on the base. The results show that in order to meet the dynamic performance requirements of CBN/diamond grinding wheel base, the 40Mn2 material is recommended for a grinding wheel base, its hardness can reach around HRC38 after temper at a temperature of around 700℃, and thus can meet the requirements of high-speed and high-precision grinding.