In the previous article, we talked most about the structure, function, maintenance, repair and so on of the automatic transfer machine, but the end of the automatic transfer machine did not say much. Today we will do a discussion on the new structure of automatic transfer machine. In recent years, the rapid development of CNC machine tools in China, the overall design level continues to improve, however; Most of the "tail" components of automatic transfer machine still follow the structural mode of ordinary lathe tail. The working performance of the traditional tail applied in the lathe can not meet the accuracy requirements of automatic transfer machine, which is found in the cutting work; The machining surface quality near the tail support end is far less good than the surface quality of the head end, and sometimes there are obvious cutting scratches, and the processing quality of the workpiece at both ends is significantly different, which is caused by the working rigidity defect caused by the traditional tail supplementing the processing function of the ordinary lathe.

The deep hole of the core shaft of the tail body is changed into two short holes, which solves the difficult problem of processing deep holes and cross holes, improves the processing technology and assembly technology, and connects the core shaft with the tail body by expanding sleeve and adopts double-end locking to improve the support stiffness of the tail, and realizes the interchangeability of the core shaft assembly. To explore a new way for automatic transfer machine to follow the traditional design mode of tail structure. In the ordinary lathe, in order to have the processing function of drilling, expanding and dumpling, the design of the tail mandrel needs to have a larger stroke to meet the work of drilling, reaming and hole feeding. The tail mandrel and the tail body have a long sliding fit area, because of the difficulty in machining the accuracy of the straightness, round and taper of the deep hole, the fit gap control cannot be too small, the fit rate between the mandrel and the hole wall is poor, the support stiffness of the tail has been greatly reduced under the state of single-end (brake block) structure locking, and the six degrees of freedom control of the tail mandrel is poor during the cutting process. Produce vibration, affect the surface quality of parts processing, in order to ensure the matching gap of the spindle sliding, the manufacturing process is completed, limiting the interchangeable assembly and production efficiency of the parts, and can be improved and optimized on the automatic transfer machine with a single function at the end of the platform only as the workpiece support.

In order to improve the cost performance of automatic transfer machine products, it is necessary to find a design idea of simple processing, convenient assembly and universal parts. The main function of the end of the CNC machine tool is to support the workpiece, and the mandrel stroke should be much shorter than that of the ordinary lathe end, and only meet the top in and out of the distance, which can simplify and narrow the working structure. The double-end locking of the mandrel significantly improves the support stiffness of the tail, which is a better way to narrow the seismic gap between the tail and the headstock. The design of the end of the CNC machine tool into the overall structure will be closer to the working stiffness of the headstock, and similar structures have been found in foreign products.

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