随着工业的发展,各类塑料在机械工业中得到广泛的利用,尤其是林业机械中的汽车、拖拉机的底盘中摩擦传动零件,如衬套,垫片、球座以及仪表齿轮等30多个零件,采用塑料代替的试制工作,取得了显著成效。为了制成高精度塑料零件,必须进行切削加工,而在零件上钻孔是应 With the development of industry, all kinds of plastics are widely used in the machinery industry, especially the friction transmission parts in chassis of tractors and tractors in forestry machinery, such as bushings, washers, ball seats and instrument gears, etc. More than 30 Parts, using plastic instead of trial production, and achieved remarkable results. In order to produce high-precision plastic parts, must be cutting, and drilling in the parts should be