在液压换向阀与调速器的大批量生产条件下要获得精密的滑阀孔是最困难的。生产液压部件时加工铸铁壳体零件上精密孔所采用的传统工艺包括钻孔、硬质合金铰刀的铰孔,以及最后一道工序——金刚石铰刀铰孔或珩磨。在这情况下可保证几何形状的精度4—6微米和尺寸精度10—15微 It is the most difficult to obtain a precise spool valve orifice under high volume production conditions for hydraulic reversing valves and speed regulators. Conventional processes used to manufacture the precision holes in the cast iron housing parts for the production of hydraulic components include drilling, reaming of carbide reamers, and the last process - diamond reamer reaming or honing. In this case, geometrical accuracy of 4-6 μm and dimensional accuracy of 10-15 μm are guaranteed