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如图1所示的工件原来采用1450磨床来磨削内孔的。磨削方法生产效率低,产品质量不高;圆度与圆柱度误差大,产品不合格率达15.44％,且需消牦大量砂轮及费用(单只工件耗砂轮2只,班产量为2件)。工件材料为40CrNiMo,调质硬度30～35HRC。为了提高生产效率和产品质量,降低消耗。我们对原磨削工艺进行了改进,自制了双刃浮动铰刀;改刚普通六角车床以铰代磨加工该类小深孔零件。实践证明,以铰代磨方法与原磨削方法相比,不但提高了生产效率7倍,有效地解决了零件内孔圆度和圆柱度超差问题,保证了内孔达到粗糙度R_a0.8的要求,降低了不良品率13.52％。而且还减少了砂轮消耗,降低了生产费用。
The original workpiece shown in Figure 1 uses a 1450 grinder to grind the bore. Grinding method of low production efficiency, product quality is not high; roundness and cylindricity error, product failure rate of 15.44%, and the need to eliminate a large number of grinding wheel and the cost (single workpiece grinding wheel 2, the class output of 2 ). Workpiece material is 40CrNiMo, quenching hardness 30 ~ 35HRC. In order to improve production efficiency and product quality, reduce consumption. We have improved the original grinding process, made a double-edged floating reamer; changed just ordinary hexagonal lathe to grind this type of small deep-hole parts. Practice has proved that the hinge grinding method compared with the original grinding method, not only improve the production efficiency of 7 times, effectively solve the parts inside the roundness and cylindricity tolerance problem, to ensure that the inner hole roughness R_a0.8 The requirements, reducing the defective rate of 13.52%. But also reduce the wheel consumption, reduce production costs.