序言由于加热和快速冷却以及马氏体转变时的体积膨胀,零件的翘曲亦即变形是不可避免的。这种现象对于轴类零件特别不利,因为径向偏摆会引起不平衡、噪音和增大磨损。为保证一定的径向偏摆,零件必须经校直,经济的方法是对轴体进行冷校。工件必须压弯并超过其“弹性极限”即发生塑性变形时才能有足够的校直作用。此时表面会出现很大的应力,因为表层马氏体在塑性交形时的断裂延伸率很小,所以校直渗碳件时会出现一些问题,如校直量不够 Preface As the heating and rapid cooling and martensitic transformation volume expansion, the deformation of the part that is deformed is inevitable. This phenomenon is particularly detrimental to shaft parts because radial runout can cause imbalance, noise and increased wear. In order to ensure a certain radial deflection, parts must be straightened, the economic method is to cold-axis body. The work piece must be bent over and beyond its “elastic limit,” meaning that it will be straightened enough to plastically deform. At this point there will be a lot of stress on the surface, because the surface martensite in the plastic shape of the fracture elongation is small, so there will be some problems straightening carburizing parts, such as insufficient alignment