In machinery field, the lather is the most extensively and frequently used machine. Easpecially the CA6140 lather, its application is very widespread. So its processing accuracy is very important. Whether the work piece can reach the accuracy required is decided by the lather. While, the part deciding the processing quality of CA6140 lather is its mainshaft. The mainshaft of the CA6140 lather is to transmit the rovolve motion and the torque to the workpiece and cutting-tool through the fixture on the end of mainshaft, in which high strengh and rotating accuracy are required .
In this design, my job contains the things as below. Mainshaft is a hollow stepped shaft. There are functional slots and thread, such as spline, pad key and so on. In the paper, allowance, cutting consumption and tolerance are calculated. Also elaborates the craft processes of the mainshaft of CA6140 lather, and the design of important fixture. After being designed, compared with traditional lather, the strength and rotating accuracy are enhanced.
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