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起重机车轮是一种受振动和冲击的变载荷承载零件。要求具有较高的耐疲劳、耐磨损和抗剥落性,不仅要有高的表面硬度,而且还要有一定的淬硬层深度。技术条件规定,车轮直径大于400mm时,车轮踏面及轮缘内侧面的表面硬度为HB300～380,最小淬硬层(至HB≥260)深度为20mm,以保证车轮的使用寿命。我厂车轮热处理最初采用火焰表面淬火,淬硬层深度仅3mm,且表层极易剥落。自1979年改用专用夹具淬火法,淬硬层提高到3.15mm左右,消除了剥落现象,质量有所提高。但是,这种淬火法淬硬层深度达不到设计要求;由于操作上的问题,不该淬火的部位也淬硬了,给机械加工带来困难,工
Crane wheel is a vibration and shock load bearing variable parts. Requires high resistance to fatigue, wear and spalling resistance, not only have a high surface hardness, but also have a certain depth of hardened layer. Technical conditions, the wheel diameter greater than 400mm, the wheel tread and rim inner surface of the surface hardness of HB300 ~ 380, the minimum hardened layer (to HB ≥ 260) depth of 20mm, in order to ensure the life of the wheel. I plant wheel heat treatment initially flame surface hardening, hardened layer depth of only 3mm, and the surface easily peeled off. Since 1979 switch to special fixtures quenching method, the hardened layer increased to 3.15mm or so, eliminating the spalling, the quality has improved. However, this quenching law hardened layer depth less than the design requirements; due to operational problems, should not quench the site also hardened, to mechanical processing difficulties, workers