Chuck, stepped jaw, and machine tool

Abstract

The invention provides a jaw that can be efficiently replaced, and that allows machining defects to be prevented. A stepped section 240 having a planar trapezoid shape and having an undulating engagement surface formed on two end surfaces 245, 246 is installed on the lower surface of a soft jaw 210 to form a stepped jaw 200. In a jaw installation groove 123 of a master jaw 120, the stepped section240 is gripped from both radial sides by a pair of grips 510, 540; and the stepped section 240 is pulled in towards the bottom of the jaw installation groove 123. The radial position of the soft jaw310 is defined by an engagement between serration surfaces 124, 234 on the lower surface of the soft jaw 310 and the upper surface of the master jaw 120. The tangential position of the soft jaw 310 isdefined by close contact of the stepped section 240 with the side surface of the jaw installation groove 123 that constitutes the base side of an isosceles trapezoid. The stepped jaw 300 and the grips 510, 540 are linked and fastened by a single clamp bolt 273. The stepped section 240 is linked to the soft jaw 310 from the lower surface; and no counterbores, etc., are present on the upper surface.

Description

technical field [0001] The present invention relates to a chuck mechanism for gripping a workpiece (work object) and fixing it to a working machine such as a lathe, a guide claw used for the chuck mechanism, and a working machine having the chuck mechanism and the guide claw. Background technique [0002] In the chuck mechanism of a machine tool such as a lathe (for example, refer to Patent Document 1), in order to perform high-precision machining of a workpiece, it is necessary to align the workpiece with high precision and / or to reproduce the height when the workpiece is reinstalled after being removed once. Workpiece alignment etc. As a chuck that can meet this requirement, a chuck mechanism has also been proposed, in which a plurality of zigzags extending in different directions are formed in advance on the abutting surface of the main jaw and the soft jaw. These zigzags are engaged to prevent the soft jaw from shifting in the surface direction of the contact surface wi...

AI Technical Summary

Problems solved by technology

However, in the conventional chuck mechanism, a relatively large countersink hole for inserting bolts is formed on the top of the soft jaw or the main jaw, and chips generated during cutting, etc., enter the countersink hole, and there will be future The risk of processing disorders

[0008] In addition, when workpiece processing using a machine tool is desired to be performed extremely efficiently in order to directly affect the product cost, in the conventional chuck mechanism, a workpiece is usually grasped by three soft jaws, because one soft jaw is composed of two soft jaws. Each mounting bolt is installed on the main jaw, so in order to replace the soft jaw, it is necessary to dismantle the bolts 6 times and install them 6 times, a total of 12 bolts, which makes the work complicated and reduces the efficiency.

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