本公司是生产齿轮的专业厂 ,主要生产汽车、柴油机和拖拉机的变速箱齿轮及工程机械后桥。变速箱齿轮中有法兰需高频淬火 ,由于公司无高频机床 ,需外协加工。淬火后 6 0 %多的法兰孔收缩 ,花键扭曲 ,磨完内孔后约有 2 5%左右的心轴装不进去。后来为了对齿轮进行退火 ,我们购买了 The company is producing gear professional factory, the main production cars, diesel and tractor gearbox and construction machinery after the bridge. There gear flange gear to be high-frequency quenching, due to the company's high-frequency machine tools, the need to outsource processing. After quenching more than 60% of the flange hole shrinkage, spline distortion, after grinding the inner hole about 25% of the mandrel installed not go. Later, in order to anneal the gear, we bought it