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一、车削加工目前,在国内发动机制造厂中,加工曲轴轴颈大多采用50年代生产的曲轴轴颈专用车床进行车削。加工时,安装在前后刀架上的刀具同时对旋转的工件进行车削加工(如图1)。开始时,前刀架上的车刀首先接触工件,车削平衡块的端面;车刀刀尖已刃磨出一定半径的圆角半径,用以加工轴颈圆角。后刀架上的宽刃车刀同时进给,用以车削出轴颈的全宽。进给过程中分:大进给、小进给和细进给三种。进给量的变化是依靠机床刀架行程挡块进行电气控制,改变节流阀的大小用以调节液压动力滑台的进给量。由于曲轴的刚性较差,主运动是由车床两头卡盘同时传动的。加工中采用宽刃车刀车削,切削力和扭矩很大,转速低,一般在35～70r/min之间,故加工
First, the turning process At present, most of the engine crankshaft manufacturing crankshaft crankshaft production in the country using the production of 50 crankshaft journal lathe for turning. During machining, the tools mounted on the front and rear tool carriers simultaneously turn the rotating workpiece (Figure 1). Initially, the lathe tool on the front turret first contact with the workpiece, turning the end face of the balance block; lathe tool tip has been grinding out a radius of the fillet radius radius, for machining fillet. After wide blade knife on the turret tool feed at the same time, used to turn out the full width of the journal. Feeding process points: large feed, small feed and fine feed three. The change of feed rate depends on the electrical control of the tool holder travel stop, and the size of the throttle valve is changed to adjust the feed of the hydraulic power slide. Due to the poor rigidity of the crankshaft, the main movement is driven by both lathe chucks at the same time. Wide-edge turning lathe turning machining, cutting force and torque, low speed, generally between 35 ~ 70r / min, so processing