论文部分内容阅读
在进行轴类和拉刀、刀杆、剪刀片等工具的热处理时,因为工件比较细而长,容易变形和弯曲,在加热过程中一定要保持垂直状态。所以此类工件常常采取井式炉加热。选取外热式井式炉有下列不利之点:(1)装炉时易散去大量的热,加热速度比较慢;(2)容易氧化脱碳,常须采用较复杂的保护气体;(3)上下温度不够均匀,不适用于高速钢工具的淬火。即使采用外热坩
In the shaft and broach, arbor, scissors and other tools for heat treatment, because the workpiece is relatively thin and long, easy to deformation and bending, in the heating process must maintain a vertical state. Therefore, such parts are often taken pit furnace heating. The selection of external furnace pit has the following unfavorable points: (1) When loading furnace easy to disperse a large amount of heat, the heating rate is relatively slow; (2) easy oxidation and decarbonization, often need to use more complex protective gas; ) Up and down the temperature is not uniform enough, not suitable for high-speed steel tool quenching. Even with external heat crucible