螺杆压缩机铸件应力对加工尺寸影响研究

Research on the Influence of Casting Stress on Processing Dimensions in Screw Compressor

螺杆压缩机对铸件尺寸加工精度要求非常高,属于精密加工件。通过对铸件人工时效退火处理和铸件砂型内冷却后的机体加工后尺寸进行了对比检测。结果表明,铸件在砂腔内冷却和人工时效退火处理对加工尺寸影响并不明显。铸件砂型内冷却温度300℃以下满足加工尺寸要求。

The screw compressor had a very high requirement on the dimensional machining precision of casting,and it was belong to the precision machining workpiece.The dimensions of castings processed after artificial aging annealing and cooling in sand mould were compared and measured.The results show that cooling and aging annealing treatment in sand chamber have no obvious effect on machining dimension.Casting sand mold cooling temperature below 300℃to meet the processing size requirements.