Finial seat

Abstract

The purpose of the present invention is to provide a center seat, which can reliably clamp the center shaft during processing, suppress the vibration of the center shaft, maintain the machining accuracy of the workpiece, and at the same time, when the bearing parts of the center shaft are worn, it can be easily Center seat for replacement of bearing components. The center seat has: a main body with a through hole, a center shaft that penetrates into the above-mentioned through hole and is slidably and rotatably supported, and a fluid pressure drive device that drives the center shaft and presses it tightly on the workpiece. Between the through hole and the tip shaft are provided a pair of bearing parts which can respectively pass through the workpiece side and the opposite side of the workpiece and are separated from each other along the axis direction, and a clamping device is provided, and the clamping device is included between the pair of bearing parts The hollow part arranged around the tip shaft and the high-pressure fluid supply device for supplying high-pressure fluid to the inner space of the hollow part, the hollow part is fixed on the main body, and the radially inner part shrinks with the inflow of high-pressure fluid, thereby pressing against the tip shaft.

Description

technical field [0001] The present invention relates to a center seat (core pressing table), which is arranged facing the main shaft of a lathe or an indexing table, and presses the other end of a workpiece whose one end is held on the lathe or the indexing table, thereby preventing the workpiece from being generated by machining force. The displacement of the workpiece is maintained to maintain the machining accuracy of the workpiece. Background technique [0002] The center seat is arranged facing the main shaft or the indexing table of the lathe, and the center shaft pushes forward and presses the other end of the workpiece held on the lathe or the indexing table at one end. Therefore, the other end of the workpiece is supported by the center shaft, so that displacement due to machining force can be suppressed, and machining accuracy can be maintained. [0003] However, since the center shaft is supported by the frame of the center seat, that is, the main body, and is sl...

AI Technical Summary

Problems solved by technology

Therefore, when the piezoelectric element that the tip shaft is strongly in contact with quickly wears out, and the wear exceeds the allowable amount, the concentricity between the tip shaft and the lathe or indexing table, etc. will be destroyed, and the tip cannot be sufficiently pressed during processing. shaft, so replacement is necessary

[0007] However, since the piezoelectric element is installed in the groove formed in the through hole of the main body, it is difficult to replace the piezoelectric element, and when replacing it, it is necessary to pay great attention not to damage the wires that apply voltage to the piezoelectric element. From a point of view, the operation of replacing the piezoelectric element is also difficult

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