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曲轴是发动机上的重要零件之一,要求有很高的精度,较高的强度和刚度。我厂生产的6120柴油机的曲轴系用合金球墨铸铁制成,材料硬度 HB 280～340。连杆轴颈的粗加工一般是曲轴加工工艺中的关键工序,毛坯的不对称,余量分布的不均匀等都希望通过粗加工纠正过来。因此要合理的按生产批量选择最佳的加工工艺。根据我厂的生产批量,我们选择了棒形铣加工工艺,为此制造了曲轴多头半自动铣床,代替原来的利用普通车床加偏心夹具车削连杆轴颈的工艺。棒形铣刀装在铣削头上,曲轴以主轴颈定位、夹紧,主轴颈轴心线与机床旋转中心重合。当工件慢速旋转一周后完成六个连杆轴颈的外圆、凸台,开档两侧
Crankshaft is one of the important parts on the engine, requiring high precision, high strength and rigidity. The 6120 diesel engine crankshaft made by our factory is made of alloy ductile iron with HB 280 ~ 340 hardness. Roughing of the connecting rod journal is generally the key process in the crankshaft machining process, the asymmetry of the blank, the unevenness of the residual distribution, etc., all hope to be corrected through the roughing. Therefore, according to the production of a reasonable choice of the best processing batch. According to the production lot of our factory, we chose the bar milling technology, so we made the crankshaft long semi-automatic milling machine to replace the original technology of turning the connecting rod journal with ordinary lathe plus eccentric jig. Rod cutter mounted on the milling head, the crankshaft to the main journal positioning, clamping, spindle centerline coincides with the center of rotation of the machine. When the workpiece after a slow rotation of a week to complete six connecting rod cylindrical, boss, open both sides of the file