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我厂生产的电动客车气缸体为细长的薄壁零件,长径比>12.5。技术要求较高:内孔直径φ48D_4,光洁度▽9,两端止口φ54D_3与内孔φ48D_4的同心发为0.015m(见图1).按普通车床的加工方法难以达到技术要求,因此我们设计了专用夹具和刀具,采用粗镱、精镗、滚压三道工序加工,气缸体质量全部达到图纸要求,效果较好。现介绍如下:工件的装夹及校正如图2所示,我们使用不淬火的加长三爪夹头,并在装上卡盘体后将卡爪内端面车成圆弧形,与弹性套外圆相配合,以尽量消除装夹的不同心度:弹性套内圆按2级精度基准孔车制,并车有肩面以防止零件加工时所产生的轴向窜动。工件按工艺要求将外圆车至φ59d 作为工艺基准;另一端用中心架支承,并用
The electric bus cylinder body produced by our factory is an elongated thin-walled part with aspect ratio> 12.5. Technical requirements are higher: the inner diameter φ48D_4, smoothness ▽ 9, both ends of the hole φ54D_3 and the inner hole φ48D_4 concentric hair was 0.015m (see Figure 1) .Generally lathe processing method is difficult to meet the technical requirements, so we designed Special fixtures and knives, the use of crude ytterbium, fine boring, rolling three processes, the quality of the cylinder body to meet all the drawings, the effect is better. Now introduced as follows: Workpiece clamping and calibration shown in Figure 2, we use the extension of the three-jaw chuck is not quenching, and chuck the body after the chuck into the arc-shaped car, with the elastic sleeve outside Circle phase, in order to eliminate the mismatch of clamping: flexible sleeve within the circle by two precision reference hole vehicle, and the car has shoulder to prevent parts machining axial displacement generated. Workpieces according to the process requirements of the car to the φ59d as a benchmark process; the other end with the center frame support, and use