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经淬火、回火的工件在质量检验时,硬度有时达不到技术要求,原因之一是工件表面产生了脱碳层。在下一道磨削加工中能否在去掉加工余量时将脱碳层磨掉,以及磨去此脱碳层后硬度值能否达到技术要求,一时不得而知,寻求一种非破坏性的测定方法是非常必要的。美国波音飞机公司有人介绍过这方面的测试方法,但不适合我国测量仪器及硬度标准。在准确度和使用上还存在一定的困难。为了解决这个问题,我们做了一些试验,现介绍如下。试验是在HW187.5型布、洛、维三用硬度计上进行的,因为此种硬度计变换负荷比较方便。而本方法的应用可在国产的任何一种洛氏硬度计或万能型硬度计上进行。
After quenching, tempering the workpiece in the quality inspection, the hardness sometimes fail to meet technical requirements, one of the reasons is that the workpiece surface decarburization layer. Whether to remove the decarburized layer when the machining allowance is removed in the next grinding process and whether the hardness value after milling the decarburized layer can meet the technical requirement can not be known for a moment and a nondestructive determination is sought The method is very necessary. Some people in the United States Boeing Aircraft Company introduced this method of testing, but not suitable for China’s measuring instruments and hardness standards. There are still some difficulties in accuracy and use. In order to solve this problem, we have done some experiments, are presented below. Test is in HW187.5 type cloth, Los, dimensional three hardness tester, because this kind of hardness meter change load more convenient. The application of this method can be made in any kind of Rockwell hardness tester or universal hardness tester.