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前言副轴二档齿轮是“黄河—75”摩托车上的一个重要的基础零件,生产批量很大。零件形状和尺寸见图1所示。零件材料为20CrMnTi钢。结构比较复杂,特别是零件上有120°均布的离合器端面三齿和较大的内孔,在三齿与内孔间还有一厚2.5mm的薄壁,这样就给机加工带来了一定的困难。原采用机加工方法生产,生产工序多,尤其是三齿部还需要手工凿修,不仅劳动强度大,生产效率低,而且零件质量也难以保证。在分析了零件的技术条件后,决定用温挤压工
Preface Vice axis gear is the second gear “Yellow River -75” on an important motorcycle parts, production volume is very large. Part shape and size shown in Figure 1. Part material is 20CrMnTi steel. The structure is more complex, especially the parts are evenly distributed 120 ° clutch end tridentate and larger bore, there is a thick 2.5mm thin wall between the three teeth and the bore, thus giving the machining a certain Difficulties. The original use of machining methods of production, production processes and more, especially the three teeth also need manual chisel repair, not only labor-intensive, low productivity, but also difficult to guarantee the quality of parts. In the analysis of the technical conditions of the parts, the decision to use warm extrusion workers