粉末冶金是一种少无切削先进工艺,随着应用日益广泛也显示出其不足之处,由于粉末冶金制件本身存在空隙,其延伸率及冲击韧性较金属材料差,因而象传动零件和受力较大零件就不能满足要求。在仪表行业内每年有数百万件小模数齿轮采用切削加工,占用了大量精密机床。我们从机械行业中看到,某些模数较大的齿轮采用粉末冶金热锻加工,使我们受到了启发。但我们又考虑到仪表上所用的齿轮都是小模数,相对来讲在热锻时材料流动性低于大模数齿轮,因此估计成型尚有一定困难。在缺乏资料情况下,我们按照毛主席“实践出真知”的教导,组织了“三结合”队伍进行了模索与 Powder metallurgy is a less no cutting advanced technology, with the increasingly wide range of applications also shows its shortcomings, due to the existence of powder metallurgy parts itself, the elongation and impact toughness than the metal material is poor, so like the transmission parts and by Larger parts can not meet the requirements. Millions of small module gears are machined annually in the instrumentation industry, taking up a large number of precision machine tools. We have seen from the machinery industry that some molds with larger modulus are hot forged by powder metallurgy, which inspired us. However, we also consider that the gears used on the instrument are all small modules, and the material flowability is lower than that of the large module at the time of hot forging. Therefore, it is still difficult to estimate the shape. In the absence of information, according to Chairman Mao’s principle of “practicing truthfulness and knowing”, we organized a “triple combination”