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齿轮渗碳淬火后,齿轮花键孔会出现孔胀大0.10~0.76 mm,由于齿轮截面尺寸悬殊较大,两端面形状不对称,整体加热变形量也不易控制,所以不宜采用整体加热缩孔,而采用高频感应加热对齿轮的花键孔缩孔是较好的办法。感应器采用螺旋形,与内孔间隙为5~6 mm,栅流:阳流=1∶5左右,加热温度700~750℃(因30CrMnTi的Ac1为765℃);加热方式采用间断式加热,增大热影响区。加热次数,视工件所需的收缩量而定。一般来说,加热速度越慢,电流透入深度越
After gear carburizing and quenching, gear spline hole will appear large hole expansion 0.10 ~ 0.76 mm, due to large gear cross-section size, both ends of the asymmetric shape, the overall heating deformation is not easy to control, it is not appropriate to use the overall shrinkage, The use of high-frequency induction heating gear spline hole shrinkage is a better way. The inductor adopts a spiral shape with a gap of 5 to 6 mm with the inner hole, and the gate current: the positive current is about 1: 5, the heating temperature is 700 to 750 DEG C (Ac1 of 30CrMnTi is 765 DEG C), the heating method adopts intermittent heating, Increase heat affected zone. The number of heating, depending on the amount of shrinkage required for the workpiece. In general, the slower the heating rate, the more current penetration depth