论文部分内容阅读
拉刀、鑽头等长桿形高速钢工具在淬火时会产生不同程度的变形,而需要进行校直一般使用的校直方法是热校,即淬火时油冷至300-400℃时由油中取出,因为此时工件温度比较高,还有大量奥氏体尚未转变为马氏体,人们就利用奥氏体良好的塑性对产生变形了的工件进行校直。这种热校方法还是目前国内外较为普遍采用的高速钢工具的校直方法,但是它有一系列的缺点:工人劳动条件差,在校直过程中因工件温度不断下降,马氏体量不断增加,若不能及时校直,则在较低温度时不易校直,甚至发生把工
Broaches, drill bits and other long bar-shaped high-speed steel tools in the quenching will produce varying degrees of deformation, and the need for straightening General use of the straightening method is thermal school, that is quenched oil cooling to 300-400 ℃ by oil Remove, because at this time the workpiece temperature is relatively high, there are a large number of austenite has not been transformed into martensite, people use the austenite good plastic deformation of the workpiece to be straightened. However, it has a series of disadvantages: the working conditions of workers are poor, the amount of martensite keeps increasing due to the temperature drop of the workpiece in the process of straightening, and the method of hot school is still more and more widely used at home and abroad. If it can not be straightened in time, it is not easy to straighten at lower temperature and even take place