Special mandrel tool for accurately grinding excircle of main shaft of high-precision numerical control machine tool

Abstract

The invention relates to a special mandrel tool for accurately grinding the excircle of a main shaft of a high-precision numerical control machine tool. A grinder mandrel body penetrates through a center hole of a to-be-processed main shaft, the right end of the grinder mandrel body extends outwards from a right taper hole, the taper excircle of the left end of the grinder mandrel body is matched with a left taper hole of the to-be-processed main shaft, and a 60-degree taper pressing block is inserted and is pressed against the right taper hole of the to-be-processed main shaft. A taper washer and a spherical washer are pressed against the outer side surface of the 60-degree taper pressing block by fixed parts and are fixed to the grinder mandrel body; two center blind holes are respectively formed in both end surfaces of the grinder mandrel body; and the center blind holes are matched with two high-precision apexes of a cylindrical grinder. When the special mandrel tool is used for processing, the two high-precision apexes of the cylindrical grinder are pressed against the center blind holes in both end surfaces of the tool so as to process, and the apexes do not need to be directly and fixedly contacted and clamped with the to-be-processed main shaft, so that the processing precision of the main shaft and the precision stability of the main shaft are guaranteed. The processing precision of the to-be-processed main shaft and the precision stability of the main shaft are guaranteed.

Description

technical field [0001] The invention relates to the finishing machining of the main shaft, the most critical part of various high-precision numerical control machine tools, that is, the practical special mandrel tooling for fine grinding the outer circle of the main shaft support bearing and the outer circle of the taper. Background technique [0002] With the development of my country's aerospace, military and automobile industries, the precision requirements of related accessories are getting higher and higher, which puts forward higher requirements for the precision of CNC machining machine tools. The spindle is one of the most critical parts of the CNC machine tool, and its precision directly affects the machining accuracy of the CNC machine tool. Therefore, in the design of the main shaft, its design accuracy is very high. Especially the accuracy of the outer circle of the main shaft support bearing. Example: The roundness and cylindricity of the straight outer circle...

AI Technical Summary

Problems solved by technology

In view of these high-precision requirements, it is difficult to guarantee the accuracy requirements of the outer circle of the main shaft according to the conventional processing methods, such as: clamping the large outer circle, machining the hole angle of the main shaft at the top of the big head

Because the diameter of the 60° angle of the inner orifice of the main shaft is large, and it is processed in batches, it is difficult to guarantee the roundness accuracy within 0.005. The accuracy requirements of roundness and cylindricity cannot guarantee that the contact area between the outer circle of the spindle taper and the bearing is greater than 80%.

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