偏心轴(见图1)是丰收-35水田型轮式拖拉机液压升降机构油泵的主要零件之一。过去对这类零件的加工一般采用两种方法。一种是靠模法;另一种是分别顶住两端面上偏心轮各自中心孔的加工法。由于该偏心轴上两个偏心轮是相连的,不适宜用靠模法,我厂过去一直沿用后一种方法加工。其缺点不仅是装拆两个辅助偏心中心孔套很费时,而且在偏心轴两端必须精磨出二级精度的工艺外圆,以便和辅助偏心中心孔套相配合,因此,生产效率低,成本也高。鉴于上述原因,我们在几年前设计了如图2所示的一套加工偏心轴的机构,可在C620车床上使用。加工时,操作者只需一次顶住心轴两端的中心孔,经 The eccentric shaft (see Figure 1) is one of the main components for the Harvest-35 paddy field wheeled tractor hydraulic lift mechanism pump. In the past the processing of such parts generally use two methods. One is by the mold method; the other is to withstand the two ends of the eccentric hole on each center hole processing method. As the two eccentric eccentric shaft is connected, not suitable for use by the method, I used to plant the past method of processing the latter. The disadvantage is not only the assembly and disassembly of two auxiliary eccentric hole sets are time-consuming, but also at both ends of the eccentric shaft must be polished out of the second-level accuracy of the process in order to assist and eccentric center hole sets, so the production efficiency is low, The cost is high. For these reasons, we designed a set of mechanisms for machining eccentric shafts as shown in Figure 2 a few years ago for use with the C620 lathe. Processing, the operator only once to withstand the mandrel at both ends of the center hole, by