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由于齿轮热处理之后会发生变形,这就导致了基准孔也跟着变形,以致热处理前所作的基准孔在热处理后失去了应有的作用。为了保证齿轮的加工质量,提高其传动性能,我们就不得不作齿轮内孔留热处理后的磨量,以便热处理后作修磨的处理。那么如何找对热处理后齿轮孔内磨的基准呢?这是一个值得我们思考的问题。由于齿顶圆在齿轮啮合中是不接触的,它与齿轮传动精度无直接关系,再加上齿顶较尖,容易磕碰,因而它不能作为工序基准使用。而热处理前的基准孔一般是各工序的基准,如果热处理后磨齿轮内孔还用它作为工序的基准,就达到了统一基准的目的。因此在齿轮精度要求不高,热处理变形不大的情况下,我们可以采用内孔作为基准来磨削内孔,因为这确实是一种最简单、经济而无需任何其它的工艺装备的方法。但我们也要看到用此种方法,受到热处理前各工序的影响较大, 容易造成累积误差,而热处理变形的影响又比较难控制,所以如果想加工出精度较高的齿轮是不能采用此法的。还有此法的效率也不是很高,不适合大批量生产。
Since the gear is deformed after the heat treatment, this causes the reference hole to deform so that the reference hole made before the heat treatment loses its proper role after the heat treatment. In order to ensure the quality of gear processing, improve its transmission performance, we have to make the gear bore after heat treatment of the amount of grinding, grinding treatment for heat treatment. So how to find the heat treatment of the grinding hole after the benchmark it? This is a question worth thinking. As the tip circle in the gear meshing is not in contact, it is not directly related to the gear transmission accuracy, coupled with the top of the tip more sharp, easy to bump, so it can not be used as a process benchmark. The benchmark before heat treatment is generally the benchmark for the process, if the heat treatment after grinding gear hole it as a benchmark process to achieve the purpose of a unified benchmark. Therefore, in the gear less demanding, heat distortion is not the case, we can use the inner hole as a benchmark to grind the inner hole, because this is indeed the most simple and economical method without any other technical equipment. However, we also need to see that in this method, the influence of each process before the heat treatment is large and the cumulative error tends to be caused. However, the influence of the heat treatment deformation is more difficult to control. Therefore, if the high-precision gear is to be machined, it can not be used Method. There is also the efficiency of this method is not very high, not suitable for mass production.