JPS5839624B2 - Sekisouwa Kunoshindashihouhou - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of aligning and centering the outer diameters of stacked plate-like works of the same shape using a gripping device that grips the outer periphery of each work.

For example, when cutting gear disc workpieces such as gears for clock parts, a large number of workpieces are fed into a hobbing machine in a stacked state and all the workpieces are cut at once, but a problem arises in this case. This is a centering operation that aligns the outer diameters of many workpieces, aligns their centers, and feeds them to the hobbing machine.

If gear cutting is performed without a large number of workpieces being perfectly aligned, each gear after machining will have an asymmetrical tooth profile or a deformed fillet.

Conventionally, in order to perform centering by stacking a large number of identically shaped workpieces, the workpieces are first stacked between a pair of supports, which are then held in the stacking direction with a relatively light force. do.

Next, the outer periphery of the stacked workpieces is gripped by a gripping device, and the outer diameters of each workpiece are aligned and centered using the gripping force of the gripping device.

The work is then fed to a hobbing machine or the like while the work is gripped by this gripping device.

However, with the method of aligning the outer diameters of the workpieces using the gripping force while gripping them with a gripping device, it is difficult to accurately unify the outer diameters of each workpiece due to the frictional force that acts between the stacked workpieces. Particularly in the case of large-sized workpieces, the above-mentioned frictional force becomes large, making it difficult to center the workpieces with high precision.

Therefore, the present invention provides a method for centering a laminated workpiece, in which the outer diameter of the laminated workpiece is gripped by a gripping device multiple times, and the outer diameter of the workpiece is accurately aligned by the impact force at the time of gripping. be.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

1 and 2 show a gripping device used in the method of the present invention.

In the figure, reference numerals 1a and 1b denote a pair of gripper arms that are respectively attached to the tips of the base 2 so as to be rotatable around pins 2a and 2b, and both gripper arms Ia,
Gripper claws 3a and 3b are attached to the tips of the gripper claws 1b, respectively, and a groove 4 is formed on the inner surface of the gripper claw 3a, and the inner surface of the gripper claw 3b is a smooth surface.

When the disk-shaped workpiece W is gripped by both gripper claws 3a and 3b, the gripper claws 3a contact the circumferential surface of the workpiece W at three points and grip the center of the workpiece W with the gripper claws 3a.

It is designed to be aligned at a certain position with respect to 3b.

A compression spring 5 is elastically mounted between the gripper arms 1 a and i b, and the compression spring 5 always urges the gripper arms 1 a and 1 b in the opening direction.

Reference numeral 6 denotes a cylinder for operating both gripper arms 1a and 1b, and an operating piece 8 is attached to the tip of a piston rod 7 that engages with the rear end of both gripper arms 1a and 1b. There is.

This cylinder 6 is a single-acting cylinder, and its piston rod 7 is always urged in the direction of arrow A by a spring 9.

Next, the present invention will be described in detail, in which a large number of gear workpieces are centered using the gripping device having the above structure.

First, above the gripper arms 1a and 1b, a predetermined number of workpieces supplied from a magazine are stacked vertically between the upper support NOa and the lower support 10b, and the workpieces are stacked vertically on both supports 10a and 10b from above and below. It is gripped, descends in that state, and stops at a predetermined position between both gripper claws 3a and 3b which are in an open state.

Therefore, the cylinder 6 is operated a plurality of times, and gripping and releasing of the outer diameter of the laminated workpiece W by the gripper claws 3a and 3b is repeated a plurality of times.

At this time, the outer peripheral surface of the laminated workpiece W is gripper claw 3a,
3b a plurality of times, and the impact force completely aligns the outer diameters of a large number of laminated works W, and the center position of each laminated work W is accurately unified.

Finally, the laminated workpiece W is held by the gripper claws 3a,
3b and both supports 10a.

10b is separated, and in this state, the laminated workpiece W is supplied to a hobbing machine or the like.

When the piston rod 7 is moved forward in the direction of arrow A, the actuating piece 8 pushes the rear ends of the gripper arms 1a, 1b apart, thereby closing the tips of the gripper arms 1a, 1b, and the piston rod 7 When retracted, the gripper arms 1a, 1b are opened by the compression springs 5.

Note that 11 is a guide shaft for preventing the operating piece 8 from moving laterally, and 12 is a stopper pin for regulating the closed position of the gripper arms 1a, 1b.

As explained above, in the method for centering a laminated workpiece according to the present invention, the grip device is operated multiple times to repeatedly grip and release the outer circumference of the laminated workpiece, and the outer diameter of each workpiece is aligned by the impact force generated at that time. Compared to the conventional method in which centering is performed simply by gripping the outer periphery once and using the gripping force, the centering ability is greatly improved and a large frictional force is generated between the workpieces. Even when working with large diameter workpieces, extremely high precision centering is possible.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a gripping device according to the method of the present invention, and FIG. 2 is an explanatory diagram showing a state in which a laminated workpiece is gripped by a supporter in the gripping device. 1a, 1b... Clipper arm, 3a, 3b.
...Gripper claw, W...Work.

Claims (1)

[Claims] 1. In a method of aligning and centering the outer diameters of each workpiece using a gripping device that grips the outer periphery of stacked plate-like workpieces of the same shape, the gripping device is operated multiple times to repeatedly grip and release the outer periphery of the laminated workpieces, A method for centering laminated workpieces, characterized in that the outer diameters of each workpiece are aligned by the impact force generated at that time.