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本文以西德Iveco Mgirus公司生产的单轴双轮胎载重卡车(13t)为例,指出了汽车后桥、后轮毂和差动机构的行星架等三个零件,通过优化设计和价值工程的核算,在设计人员和铸造人员的密切配合下,获得造价下降1/4的优异成绩,而且零件的使用性能反而有所提高。图1是后桥外壳的原设计,它至少由12个零件焊接而成,后桥半壳采用SG42钢优质板材,后桥每端要承受100kN的载重。由于种种原因,钢板已不允许再加厚,因此焊缝处经常出现裂纹。自72年起,就开始改用整体铸件(图2),在不加大外形尺寸的情况下,只是加厚铸件某些危险截面,铸件材质为GGG-40(相当于QT40-10)球铁。通过水力脉动试验,确定了优化的外形。实践证明,后桥每端的承受力可提高到150kN,该铸件的金加工全部在生产线上完成。与原
In this paper, Iveco Mgirus company produced a single-axle dual-tire truck (13t) as an example, pointed out that the rear axle, the rear wheel hub and differential gear carrier and other three parts, through the optimization design and value engineering accounting, In the close cooperation of designers and foundry personnel, get a quarter of the cost of excellence, but the performance of the parts but increased. Figure 1 is the original design of the rear axle housing, which is welded at least 12 parts, SG42 steel rear axle half-shell plate, each end of the rear axle to withstand 100kN load. Due to various reasons, the plate is no longer allowed to thicken, so cracks often appear at the weld. Since 72 years, began to switch to the overall castings (Figure 2), without increasing the size of the case, only a thickening of some of the dangerous sections of castings, castings made of GGG-40 (equivalent to QT40-10) ductile iron . Through the hydraulic pulsation test, to determine the optimized shape. Practice has proved that the bearing capacity of each end of the bridge can be increased to 150kN, the casting of the gold processing all completed in the production line. With the original