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铝合金(铝锑镁及高锡铝合金)作为抗磨合金应用在汽车及拖拉机发动机主轴瓦及连杆瓦上已很广泛,它是铜合金瓦的良好代用品,使用性能符合技术要求,价格也比铅青铜瓦便宜。在汽车修理中,手工刮瓦的方法已逐渐由镗瓦法取代,但怎样提高铅合金瓦的镗削精度,特别是光洁度问题更为突出!在这里谈一下我们在镗瓦机上镗削铝合金的体会: 一、镗铝合金瓦时常产生的问题: 1.与铅青铜相比较,铝合金的塑性大,镗削时的塑性变形也大,所以在切削刃处出现局部高温区,加之铝合金的熔点也较低,故在镗削铝合金瓦时易产生刀瘤,使加工表面的光洁度大大降低,镗后瓦孔的锥度也大。 2.铝合金的化学成分中含有少量硅的化合物的质点,硬度较高,镗瓦时刀具磨损严
Aluminum alloy (aluminum antimony magnesium and high tin aluminum alloy) as a wear-resistant alloy used in automobile and tractor engine main bearing and connecting rod has been very extensive, it is a good substitute for copper alloy tile, the use of performance in line with technical requirements, the price Also cheaper than lead bronze tiles. In auto repair, the method of manual scraping tile has been gradually replaced by boring tile method, but how to improve the boring accuracy of lead alloy tile, especially the problem of finish is more prominent! Here we talk about boring machine boring aluminum alloy Experience: First, boring aluminum alloy tile often produce problems: 1. Compared with lead bronze, aluminum plasticity big, plastic deformation when boring is also large, so the emergence of the cutting edge at the local high temperature zone, combined with aluminum alloy The melting point is lower, so when boring aluminum alloy tile is easy to produce knives, the processing surface finish is greatly reduced, the taper of the boring tile is also large. 2. The chemical composition of aluminum alloy contains a small amount of silicon compounds of the particle size, high hardness, boring tile cutter wear and tear