按修理工艺规定,为了得到较高的曲轴轴颈表面光洁度,曲轴磨削后应进行抛光,抛光前还要对轴颈上的油孔锪铣,去掉尖棱毛刺。如果不这么做就拿来装机使用,很容易在使用初期就发生拉瓦现象。这种拉瓦发生在瓦片中间,伤痕沿整个瓦片的内圆圆周,拉伤的宽度与轴颈上油孔的尺寸相当。拉瓦严重时,沟痕可深达0.0～0.6毫米,甚至把合金层拉光,露出 According to the provisions of the repair process, in order to get a higher surface finish of the crankshaft journal, the crankshaft should be polished after grinding, but also on the journal before polishing hole 锪 milling, remove the sharp edge burr. If you do not do this, you can easily use it in the early stages of deployment. This lava occurs in the middle of the tile, the flaw along the entire circumference of the inner circumference of the tile, and the width of the strain is equivalent to the size of the pinhole. Lava serious, groove marks can be as deep as 0.0 ~ 0.6 mm, and even pull the alloy layer exposed