细长杆有时会出现不需要的弯曲,例如已粗加工的汽车半轴(40Cr,28～32HRC)经调质处理会发生弯曲,在560mm长度上弯曲量为2～10mm。精加工后高频淬火还会产生二次弯曲,所以,对每根半轴必须作两次校直,工作量较大。 在批量生产中,一般的校直方法是:先由一人在支架上用百分表测量并标出杆的弯曲量和弯曲方向,再由第二人将杆放在压力机上反压校直(熟炼工人通常要反 Slender rod sometimes appear unwanted bending, for example, has been rough car axle (40Cr, 28 ~ 32HRC) will be quenched after quenching, bending 560mm length of 2 ~ 10mm. After finishing high-frequency quenching will produce secondary bending, so, for each axle must be made twice straightening, heavy workload. In mass production, the general method of alignment is: first by a person in the bracket with a dial indicator to measure and mark the amount of bending and bending direction, and then by the second person on the bar on the press back straightening ( Skillet workers usually have to reverse it