论文部分内容阅读
我厂生产的膨化机上的主轴,材料为45钢,要求调质后硬度 HB22～250,是粗加工后进行调质。开始我们发现淬火后硬度低(HRC40左右),经分析后认为是粗加工的表面光洁度低、刀痕深,加热时形成的氧化皮在淬火时不易脱落,因而影响工件淬火时的冷却速度,使得淬火后的硬度低。后来,我们把粗加工的光洁度要求提高到▽4以上(原为▽4以下)淬火后硬度都合格。
I plant the extruder on the spindle, the material is 45 steel, hardness requirements after conditioning HB22 ~ 250, is the rough after quenching and tempering. At the beginning, we found that the hardness after quenching is low (HRC40 or so). After analysis, it is considered that rough surface finish is low and the knife marks are deep. The oxide scale formed during heating is hard to fall off during quenching, thus affecting the cooling rate of the workpiece during quenching, Hardness after quenching is low. Afterwards, we raised the roughness finish of roughing to ▽ 4 or higher (originally ▽ 4 or lower) and all the hardness after quenching was acceptable.