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制冷压缩机运转中,经常出现缸套“拉毛”“拉伤”的质量事故。近几年来,虽然应用了硼铸铁缸套,并对HT20-40铸铁缸套采取了离子氮化、表面沉积TiN、软氮化以及含氮马氏体的薄壳淬火等表面强化措施。我厂一直采用高磷铸铁缸套,耐磨性较好,为解决“拉毛”“拉伤”弊病,运用了电接触加热表面淬火进行强化处理。实践证明,这是一项投资少、见效快、质量好的工艺措施。 1.缸套电接触加热表面淬火的基本原理电接触加热表面淬火是利用接触电阻热加热工件表面,利用被淬火工件本身的热传导进行冷却,以达到淬火的目的。这种工艺
Refrigeration compressor operation, often appear cylinder liner “razor ” “strain ” quality accident. In recent years, although boron cast iron cylinder liner has been used, surface strengthening measures such as ion nitriding, surface deposition of TiN, soft nitriding and thin shell hardening of nitrogen-containing martensite have been taken on HT20-40 cast iron cylinder liner. Our factory has been using high-phosphorus cast iron cylinder liner, wear resistance is better, in order to solve “lacquered ” “pull ” ills, the use of electrical contact heating surface hardening for strengthening treatment. Practice has proved that this is a less investment, quick, good quality and technological measures. 1. Cylinder liner contact heating the basic principle of surface hardening Electrical contact heating surface hardening is the use of contact resistance heat heating the workpiece surface, the use of quenching the workpiece itself is the heat conduction cooling, in order to achieve the purpose of quenching. This craft