论文部分内容阅读
图示为电梯零件左、右楔块。开始采用820℃整体加热,保温后从炉中取出,局部冷却。即齿部淬入NaCl水溶液。结果齿侧凸台发生变形,向齿部拱起0.5～1mm。这是由于先冷的齿部产生收缩,使缓冷的齿背受到压缩,再加上齿面淬火过程中马氏体产生膨胀,就是说这种变形是热应力和组织应力同向迭加的结果。据分析,由于齿部表面积远大于齿背,即是同时入水冷却,齿部的实际冷速也
The picture shows the left and right wedges of the elevator parts. Start with 820 ℃ overall heating, remove the heat from the furnace, the local cooling. That tooth quenched into NaCl aqueous solution. As a result, the tooth-side boss deforms and archs to the teeth by 0.5 to 1 mm. This is due to the contraction of the first cold teeth, so that the slow cooling of the back by the compression, coupled with the tooth surface quenching martensite expansion, that is to say this deformation is the thermal stress and stress in the same superposition result. According to analysis, due to the tooth surface area is much larger than the back, that is, while the water cooling, the actual cooling rate of the tooth is also