我厂0.6米~3液压挖掘机中的液压马达活塞缸(图1),材质为 QT45-5,孔为一级精度,光洁度▽9,七孔与活塞要求通用互换。我们在卧式镗床上采用了圆弧刃浮动镗刀和球面浮动挤压刀对缸进行粗镗—粗浮镗—精浮镗—浮动冷挤压加工达到了设计要求。它与珩磨、研孔比较具有效率较高(提高两倍)、通用互换、质量稳定特点,适于成批生产。 Hydraulic 0.6M ~ 3 hydraulic excavator hydraulic motor piston cylinder (Figure 1), the material is QT45-5, the hole is a precision, finish ▽ 9, seven holes and the piston requires universal interchangeable. We have adopted the horizontal boring machine floating edge boring knife and spherical floating squeeze knife on the cylinder rough boring - Rough boring - fine float boring - floating cold extrusion processing to meet the design requirements. Compared with honing and grinding holes, it has higher efficiency (doubling), universal interchangeability and stable quality, and is suitable for mass production.