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BJ 212越野汽车用的492 Q型汽油机的缸体,是用ZL 10铝合金低压铸造成型的。缸体挺杆孔尺寸为φ25~(+0.023)_0,光洁度为△8,孔深45毫米,长期存在孔壁划伤和光洁度差等问题。其中一半以上是由于刀瘤引起的划伤。而这种铝合金产生刀瘤的切削速度范围是3～80米/分。刀瘤产生的大
The cylinder block of the 492 Q-petrol engine for the BJ 212 off-road vehicle is low profile cast with ZL 10 aluminum alloy. Cylinder tappet hole size φ25 ~ (+0.023) _0, smooth finish △ 8, hole depth 45 mm, long-term existence of hole wall scratches and poor finish and other issues. More than half of them are due to knife-induced scratches. And this kind of aluminum alloy cutting knife cutting speed range is 3 ~ 80 m / min. Large tumor generated