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成都航空仪表公司有一滑块零件材料为20号钢,要求渗碳0.4～0.8mm,淬火至硬度HRC60—64。因内孔磨削质量不高,改为高转速车削,质量和效率均明显提高。 采用磨削加工φ7H11孔,表面粗糙度为Ra3.2μm,所需工时25min/件,加工后有喇叭口;而改用高速车削后,表面粗糙度可达Ra1.25—0.8μm,工时为5min/件,且无喇叭口。 磨削缺欠的原因是:压紧砂轮的螺钉为M3螺杆,强度太差,造成喇叭口,而且表面粗糙。进给量只能很小,每次0.01～0.02mm,否则砂轮轴产生弹跳,因而所需工时多。 车削用复合立方氮化硼内孔车刀,在C616A车床上加工,用组合夹具保证孔距、垂直度。
Chengdu Aeronautical Instrument Company has a sliding part of the material for the 20 steel, requiring carburizing 0.4 ~ 0.8mm, quenched to a hardness of HRC60-64. Due to the quality of the inner hole grinding is not high, turning to high-speed turning, quality and efficiency were significantly improved. Grinding with φ7H11 hole, the surface roughness of Ra3.2μm, the required working time 25min / pieces, after processing a bell mouth; use high-speed turning, the surface roughness of up to Ra1.25-0.8μm, working hours of 5min / Piece, and no bell mouth. The reason for the lack of grinding is that: the screw for pressing the grinding wheel is M3 screw, the strength is too poor, causing the bell mouth, and the surface is rough. Feed rate is only small, each 0.01 ~ 0.02mm, otherwise the wheel shaft bounce, which requires more man-hours. Turning Cubic Boron Nitride Tools for Turning, Machining on a C616A Lathe, with Combination Fixtures to Ensure Pitch, Verticality.