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三米抽油泵油缸是由双节缸套连接成。缸套材料为20CrMo,经渗碳、淬火后表面硬度达HRC58～62,其两端面对孔轴线的跳动为0.002mm,光洁度为8。缸套端面的加工质量将直接影响油泵的密封性和使用寿命。历年来,加工端面是在外圆磨床上,用砂轮侧面靠出。采用这种加工方法后存在着下列一些问题长期不能解决: (1)生产效率低。在精加工之前,先用心轴靠出一端面,然后以此定位在平面磨床上粗磨另一面,并留出小量精加工余量,再在外圆磨床上加工两端面。
Three meters pumping cylinder is a double cylinder liner connected into. The material of the liner is 20CrMo. After carburizing and quenching, the surface hardness reaches HRC58 ~ 62, its both ends face the bore axis of the beat is 0.002mm, finish 8. Cylinder liner end of the processing quality will directly affect the pump seal and service life. Over the years, the processing end is cylindrical grinder, with the side of the wheel by. After using this processing method, there are some problems that can not be solved in the long term: (1) Low production efficiency. Prior to finishing, the first end of the surface with a mandrel, and then positioning the surface grinder coarse grinding the other side, and set aside a small amount of finishing allowance, and then cylindrical surface machining both ends.