论文部分内容阅读
滚动轴承外径尺寸磨小或淬火后的轴类零件外径尺寸磨小而造成的废品,一般多采用电镀硬铬的办法挽救。这种工艺方法成本较高,镀铬后还得修磨外径。我们根据马氏体的比容大于奥氏体的比容这个规律,采用人工时效或冷处理的方法,使淬火后钢材内部的残留奥氏体转变为马氏体,从而使零件的体积胀大,外径尺寸相应地增大到符合工艺要求。一般滚珠轴承钢淬火后含有10～15%的残留奥氏体。由于奥氏体的自由能较高,残
Rolling bearing outer diameter size small or quenched after grinding shaft diameter of small parts caused by scrap, the general use of hard chromium plating method to save. This high cost of the process, after chrome have grinding diameter. According to our law, the specific volume of martensite is larger than that of austenite, artificial austenite or cold treatment is adopted to transform the retained austenite in the steel after quenching into martensite so that the volume of the part expands, The size of the outer diameter is correspondingly increased to meet the technical requirements. General ball bearing steel quenched with 10 to 15% of the retained austenite. Due to the higher free energy of austenite, residual