JPS628983Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a nut runner equipped with a device that automatically clamps a workpiece on a fixed reference fixture and then temporarily clamps the workpiece prior to main clamping.

In a transfer machine fixture, if the reference for a flanged cylindrical workpiece is the outer peripheral surface of the boss as the horizontal reference and the end face of the flange as the vertical reference, the operator must place the workpiece within the vertical plane of the fixture. If the rotational positioning and clamping to the reference surface are automatically performed using a nut runner while it is still attached to the reference bush, processing accuracy defects such as poor roundness due to mounting distortion will occur.

SUMMARY OF THE INVENTION An object of the present invention is to provide a nutrunner with a temporary clamping device that prevents poor machining accuracy due to mounting distortion when a workpiece is mounted and clamped on a reference bush.

The temporary clamping device according to the present invention automatically clamps the workpiece temporarily before the main clamp after attaching it to the reference bushing. During temporary clamping, the workpiece is clamped with a weak force that allows the workpiece to come into close contact with the reference surface. The temporary clamping device is designed to be able to rotate when performing rotational positioning during main clamping.

Further, the temporary clamp is not directly clamped with a hydraulic cylinder, but is clamped with a weak force via a spring.

Hereinafter, the present invention will be specifically explained with reference to embodiments illustrated in the drawings.

The figure is a sectional view showing an embodiment of the present invention. In the figure, 1 is a nut runner body, 2 is a fixture body, 3 is a reference bush fixed to the fixture body 2, and 4 is a workpiece attached to the base bush 3. The workpiece 4 has a flanged cylindrical shape as shown in the figure, and the outer peripheral surface of the boss serves as a horizontal reference, and the end face of the flange serves as a vertical reference. Reference numeral 5 denotes a clamper consisting of a two-pronged claw that can be opened and closed around a fulcrum pin 8, and is supported by the fulcrum pin 8 at the tip of the clamp rod 7. The lower end of the clamper 5 is in contact with the cam 6 and slides along the surface of the cam 6. Clamper 5
is always in contact with the surface of the cam 6 by a spring 20.

The cam 6 is attached to a cap 12 with bolts, and the cap 12 is attached to a guide 13. The lower end of the clamp rod 7 is attached to a slider 9, and the slider 9 slides on the inner surface of the guide 13 via the key 11.
1 prevents it from rotating. Guide 1
A nut 10 is attached to the lower end of the cylinder 3, and the force of a piston 17 of a cylinder 16 is transmitted to the nut 10 via a spring 15.

Further, when the workpiece 4 is positioned in the rotational direction, the workpiece 4 rotates when it is fully clamped, so a thrust bearing 18 is inserted between the guide 13 and the cylinder 16 so as to follow this rotation. Therefore, together with the work 4, the clamper 5
rotates. The guide 13 and cylinder 16 are attached using reamer bolts 19 and washers 21. The mounting hole of the guide 13 is an elongated hole so that it can be rotated by any angle.

Note that a portion 22 surrounded by a chain line is the present clamp device, of which 23 indicates the present clamper and 24 indicates a clamp bolt.

As explained above, according to the present invention, the workpiece is reliably brought into close contact with the reference surface of the fixture, and defects in machining accuracy due to poor clamping are eliminated.

Furthermore, since the temporary clamping operation is automatically performed, the operator does not forget to perform the temporary clamping operation himself.

[Brief explanation of the drawing]

The figure is a sectional view showing an embodiment of the present invention. 1... Nutrunner body, 2... Fixture body, 3... Reference bushing, 4... Workpiece, 5...
Clamper, 6...Cam, 7...Clamp rod, 13...Guide, 15...Spring, 16
... Cylinder, 17 ... Piston, 18 ... Thrust bearing, 19 ... Reamer bolt, 22
...This clamp device.

Claims (1)

[Scope of utility model registration request] After attaching the flanged cylindrical workpiece, with the outer peripheral surface of the boss as the horizontal reference and the end face of the flange as the vertical reference, to the reference bush fixed to the fixture body, this clamping device attached to the nut runner The nut runner for main clamping includes a clamper for temporarily clamping the workpiece, which has a claw that can be opened and closed so that it clamps the upper end surface of the workpiece when opened and unclamps it when it is closed, a clamp rod that supports the clamper at its tip, and A guide that guides the vertical movement, a cam mechanism that opens and closes the claw of the clamper as the clamp rod moves up and down, one end of which is fixed to the nut runner, and the other end of which allows the guide to rotate horizontally by a small angle. and a cylinder whose piston tip is connected to the rear end of the clamp rod via a spring,
A nut runner characterized by being equipped with a temporary clamping device that automatically temporarily clamps the workpiece after the workpiece is attached to the reference bushing and before the main clamping operation of the workpiece.