JPH0593706U - Work chuck device - Google Patents

Abstract

(57) [Summary] [Purpose] The work of exchanging chuck claws is greatly reduced. [Structure] The chuck claws 13 have first curvatures having different curvatures.
And the second work holding surfaces 13a and 13b are provided. The chuck claw 13 is rotatably attached to the spindle 12. When the curvature of the outer peripheral surface of the work W is large, the first work gripping surface 13a is directed toward the center side of the spindle 12, and when the curvature of the outer peripheral surface of the work W is small, the second work gripping surface 13b is the center of the spindle 12. Turned to the center side. One chuck claw 13 can be used for a plurality of types of works W, and the replacement work of the chuck claw 13 is reduced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a work chuck device provided in a processing device such as a lathe for fixing a work to be processed.

[0002]

[Prior Art]

 Conventional lathes are equipped with a chuck device to fix the workpiece to be cut. The chuck device is provided with a plurality of chuck claws for gripping the outer peripheral surface of the work. The work is usually cylindrical, and the chuck jaws are provided with a work gripping surface having a curvature as close as possible to the outer peripheral surface of the work. The chuck claw is detachably attached to the chuck device, and when the diameter of the outer peripheral surface of the work is changed, the chuck claw is replaced with a chuck claw having a work gripping surface that matches the work.

[0003]

[Problems to be solved by the device]

 However, such a chuck claw replacement operation is troublesome and time-consuming. That is, at the time of replacement, it is necessary to first loosen the bolt fixing each chuck claw, remove the chuck claw, and then attach a new chuck claw and fix it with the bolt. Must be done. The present invention has been made in order to solve such a conventional problem, and a single chuck claw can be used for a plurality of types of works, and the work of exchanging the chuck claw can be significantly reduced. It is an object of the present invention to provide a chuck device capable of

[0004]

[Means for Solving the Problems]

 In the workpiece chucking device according to the present invention, the chuck claw has a plurality of gripping surfaces having different curvatures and is rotatably provided so that a predetermined gripping surface is engaged with the outer peripheral surface of the work. It has a feature.

[0005]

【Example】

 The present invention will be described below with reference to illustrated embodiments. FIG. 1 shows a lathe equipped with a chuck device according to an embodiment of the present invention. In this figure, a spindle 12 is rotatably provided on a spindle column 11, and three chuck claws 13 are attached to the spindle 12. The work is gripped by these chuck claws 13. The chuck claws 13 are arranged at equal intervals around the rotation center of the spindle 12, and can be displaced in the radial direction of the spindle 12 by a drive mechanism (not shown). That is, the chuck claw 13 is biased in the direction of the rotation center of the spindle 12 to grip the work.

A turret 14 is arranged adjacent to the spindle column 11. The turret 14 is rotatably supported by the column 15 and can be stopped at a predetermined rotation angle. A plurality of cutting tools such as a cutting tool are attached to the outer peripheral surface of the turret 14. The column 15 is slidably supported by a Z-axis guide rail 17 fixed to a slide base 16 and can reciprocate in the Z-axis direction parallel to the rotation center axis of the spindle 12. The slide base 16 is slidably supported by an X-axis guide rail 18, and can reciprocate in the X-axis direction perpendicular to the rotation center axis of the spindle 12. Therefore, the column 15 moves with respect to the Z axis and the X axis, whereby the turret 14 moves toward or away from the work.

FIG. 2 shows the chuck claw 13 attached to the spindle 12. The chuck claws 13 extend radially from the rotation center of the spindle 12 and are fixed to the spindle 12 by fixing pins 21. The chuck claw 13 has first and second work gripping surfaces 13a and 13b in this embodiment. The first and second work gripping surfaces 13a and 13b have different curvatures from each other, and the chuck claws 13 have work gripping surfaces 13a and 13b which match the outer peripheral surface shape of the work W and have the spindle 12 of the spindle 12, respectively. It is fixed so that it faces the center.

FIGS. 3 and 4 show the chuck claw 13. The first and second work gripping surfaces 13a, 13b are a part of a cylindrical surface having a predetermined curvature, and in the illustrated example, the first work gripping surface 13a is better than the second work gripping surface 13b. It has a small curvature. That is, in the case of a work having a large diameter, the first work holding surface 13a is used, and in the case of a work having a small diameter, the second work holding surface 13b is used.

The chuck claw 13 is attached to the movable portion 12 a of the spindle 12, that is, a portion that is displaced in the radial direction of the spindle 12 by a drive mechanism. A support shaft 22 is fixed to the movable portion 12 a, and the chuck claw 13 is rotatably supported by the support shaft 22. Further, the movable portion 12a is provided with two holes 23 and 24, and the distal end portion of the fixed pin 21 can be fitted into these holes 23 and 24. The fixing pin 21 is inserted into a through hole 25 formed in a portion eccentric from the center of the chuck claw 13, and the tip of the fixing pin 21 protrudes from the bottom surface of the chuck claw 13 so that any one of the holes 23, 24. Is inserted into.

Since this embodiment has the above-mentioned structure, it can be used for works having different outer peripheral diameters. That is, in the case of a work having a large diameter, the chuck claw 13 is attached to the spindle 12 by the fixing pin 21 so that the first work holding surface 13a faces the center side of the spindle 12. When the work is changed to have a small diameter, the fixing pin 21 is pulled out from the hole 23, and the chuck claw 13 is rotated 180 degrees around the supporting shaft 22. Then, the fixing pin 21 is inserted into the hole 24, and the chuck claw 13 is fixed. As a result, the second work gripping surface 13b faces the center of the spindle 12.

As described above, according to the present embodiment, even if the size of the workpiece to be machined changes, it is only necessary to change the direction of the chuck claw 13, and it is not necessary to replace it with a different chuck claw as in the conventional case. Absent. That is, the replacement work of the chuck claw 13 is performed only when the work gripping surfaces 13a and 13b of the chuck claw 13 do not match the new work, and therefore the replacement work of the chuck claw 13 can be significantly reduced.

FIG. 5 shows another example of the chuck claw 13. The first work gripping surface 13a of the chuck claw 13 is formed in a step shape and is used for gripping a work having a smaller diameter toward the tip. The present invention is also applied to such a chuck claw 13.

The configuration of the above embodiment is merely an example. For example, the structure for fixing the chuck claw 13 to the spindle 12 may be replaced with another structure, and the chuck claw 13 may be fixed by a member other than the fixing pin 21. Further, the chuck claw 13 may be configured to have three or more work gripping surfaces.

Further, it goes without saying that the present invention can be applied not only to a lathe but also to other processing devices.

[0015]

[Effect of the device]

 As described above, according to the present invention, it is possible to significantly reduce the work of exchanging the chuck claws.

[Brief description of drawings]

FIG. 1 is a perspective view showing a lathe equipped with a chuck device according to an embodiment of the present invention.

FIG. 2 is a front view showing a spindle and a chuck claw.

FIG. 3 is a perspective view showing a chuck claw.

FIG. 4 is a cross-sectional view showing a chuck claw.

FIG. 5 is a perspective view showing another example of chuck claws.

[Explanation of symbols]

 13 Chuck claws 13a, 13b Work gripping surface W Work

Claims (1)

[Scope of utility model registration request] 1. In a work chucking device for gripping an outer peripheral surface of a work by a plurality of chuck claws, each chuck claw has a plurality of gripping surfaces having different curvatures, and a predetermined gripping surface is provided on the outer peripheral surface of the work. A chuck device for a work, which is rotatably provided so as to be engaged.