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我厂生产的部标系列模架,其中一组件导套如图,它是由20钢经机械加工后渗碳淬火制成。技术要求HRC58～62、内孔表面粗糙度Ra0.05,外径Ra0.4。在热处理过程中该导套易产生软点——局部区域硬度偏低。在热处理后的机械加工过程中,常因软点的区域大、粗糙度高而报废。在长期生产实践中,我们发现导套内孔在热处理后精镗时,内表面呈亮银白色,有时个别区域呈暗灰白色。经多次作
I plant the standard superscript series mold, one of the components guide sleeve shown in Figure, which is 20 by the steel after carburizing and machining. Technical requirements HRC58 ~ 62, the hole surface roughness Ra0.05, diameter Ra0.4. The guide sleeve is prone to soft spots during heat treatment - the hardness of the local area is low. In the heat treatment after the machining process, often due to the soft spot area, high roughness and scrapped. In the long-term production practice, we found that when the inner bore of the guide sleeve is fine bordered after heat treatment, the inner surface is bright silver-white, and sometimes the individual areas are dark grayish white. After many times