一、滚压前存在的问题电力机车轮对的轮芯毂孔压装长度与其直径之比 K 值为1.14(其它机车 K=0.7～0.8),由于 K 值偏大,给制造工艺带来以下难题。1、K 值大则压装接触面积大,因此压装压力及其曲线受接触面的光洁度、几何精度等影响也较大,难以掌握配吨的规律。因而造成在轮座配吨时,精车之后还需要再将其表面锉毛,使光洁度下降到▽_4左右,否则 First, the problems before rolling Electric locomotive wheel hub hole punched length and diameter ratio of K value of 1.14 (other locomotive K = 0.7 ~ 0.8), due to the K value is too large, to the manufacturing process to bring the following problem. 1, K value is large press-fit contact area, so the press pressure and its curve by the contact surface finish, geometric accuracy, etc. are also more difficult to grasp the law with tons. Resulting in the wheel seat with tons, fine car after finishing the surface need to be fur, so that the finish down to about ▽ _4, or