Straight bevel gears used in car differential have strict requirements for dimensional precision and quality, it is difficult to form accurately them by the traditional forging techniques.
轿车上的直齿圆锥齿轮尺寸精度与产品质量要求很高，难以采用常规的塑性加工技术成形。
It is difficult to gain homogeneous coating when precision small holes are electroplated chrome, which affects the dimensional precision and the form precision of the product.
精密小孔在镀硬铬时，很难获得均匀的镀层，直接影响产品的尺寸精度和形位精度。
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