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J81-1250大齿轮内孔均布三键槽,为保证其加工质量,我们对键槽加工工艺进行了改进。原加工工艺图1为三等分键槽简图,按原工艺,先加工键槽1宽度至尺寸50_0~(0.005),然后以槽1为基准,按图2所示的120°孔用键槽样板分别加工键槽2,3的侧面α_2,α_3,使槽距120°符合样板,然后再插槽宽至尺寸(图3)。这种加工方法既不方便,又难以保证加工质量,因为加工键槽2、3时,样板不是以键槽1的同一侧面为基准,也没有利用机床工作台分度圆盘进行精密分度。当槽距小于样板时,样板下不去,一旦槽距大于样板尺寸,就会造成废品而无法挽救。
J81-1250 large gear bore three keyway, in order to ensure the quality of its processing, we have improved the keyway processing technology. According to the original process, the width of the keyway 1 is first processed to the size of 50_0 ~ (0.005), and then to the reference of the groove 1, the keyway patterns of the 120 ° holes shown in FIG. 2 Machining the side surfaces of the keyways 2, 3 α_2, α_3, so that the groove pitch 120 ° line with the template, and then the slot width to size (Figure 3). This processing method is not convenient, but also difficult to ensure the quality of processing, because the processing keyway 2, 3, the model is not the same side of the keyway 1 as a benchmark, nor the use of machine table indexing disk precision indexing. When the groove pitch is less than the model, the model does not go under, once the groove distance is greater than the size of the model, it will cause waste and can not be saved.