JPS5837099B2 - Workpiece mounting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a workpiece mounting device that is capable of automatically mounting a workpiece without mounting errors.

Conventionally, automatic gear cutting machines have existed, and in order to accurately cut gears with this device, the first step is to align the boss hole of the workpiece that will be used for bevel gears and spur gears so that it is on the center line of the mounting shaft. I had to install it correctly.

If the workpiece is not attached accurately to this, the pitch circle
This is because errors occur in the tooth height, etc., resulting in poor meshing.

However, when it comes to precision gears, even if there is an error of a few microns in the tooth depth, etc., it cannot be checked because it is automatic during processing, and even if the gear is made, it does not look any different from the appearance of a precision gear, so it cannot be checked by machines etc. After the product was installed, an abnormal noise was heard and it was determined that it was a defective product.

This is because if there is no abnormality in the workpiece, the workpiece will be incorrectly attached.

It is extremely technically difficult to perform this attachment accurately and automatically over the entire workpiece.

Therefore, in the present invention, a flange-shaped piston is integrally provided in the middle of a hollow piston rod, this piston is provided in a single hydraulic cylinder body so as to be able to reciprocate, and the rear is sealed on the outer periphery of the piston rod. A cylindrical secondary piston is inserted loosely into the piston rod, and the front outer periphery of the piston rod is slidably slidable in the front wall hole of the cylinder body, and the outer periphery of the secondary piston is slidably slidable in the rear wall hole of the cylinder body. , the piston and the auxiliary piston are attached to each other so as to be tensioned, an outer cylinder is provided in the axial direction in front of the cylinder body, an inner cylinder is inserted loosely inside the outer cylinder, and the rear end of this cylinder is fixed to the front of the piston rod. The inner cylinder and the rear end of the shaft rod that is loosely inserted into the piston rod are fixed inside the sub-piston, and the front ends of the inner cylinder and the shaft rod are formed with a collet part and a collet pin part respectively, or By dividing the inner cylinder into two parts at the middle of the inner cylinder, inserting the two inner cylinders into each other so as to compress them a little, and supporting each part elastically at all times, the workpiece can be fixed after being preliminarily attached to the workpiece. The installation is completed while contacting the outer cylinder end face without any error, or the installation is completed with a strong force immediately after contact, and even if all workpieces are automatically installed individually, accurate installation is possible. This eliminates the drawbacks of the prior art.

Its structure will be explained with reference to the drawings.

Reference numeral 1 denotes a cylinder main body divided into two horizontally, and through holes 2 and 3 are bored in both side walls.

4 is a hollow piston rod, and a flange-shaped piston 5 is integrally provided approximately on the circumference of the hollow piston rod.

The piston 5 is watertightly and slidably provided on a large circumferential wall within the cylinder main body 1 via an O-ring.

Reference numeral 6 denotes a cylindrical sub-piston, whose rear force (on the right side in FIG. 1) is closed, and a shaft body 7 is integrally molded therein.

The inner periphery of this sub-piston 6 is located at the rear of the piston rod 4 (first
It is approximately the same as the outer circumference of the piston rod 4 (on the right side of the figure).
The inner peripheral part of the sub-piston 6 is provided on the rear outer periphery of the sub-piston 6 in a water-tight and slidable manner with an O-ring or the like.

The outer periphery of this sub-piston 6 is inserted into the through hole 2 in the rear wall of the cylinder main body 1 (on the right side in Fig. 1), and the outer periphery on the front side of the piston rod 4 (on the left side in Fig. 1) is located in the front of the cylinder main body 1 (on the left side in Fig. 1). Each through-hole 3 in the wall is provided with an O-ring or the like in a watertight and slidable manner.

Reference numeral 8 denotes a connecting bolt with a bulging crown 9 formed on the top, and the connecting bolt is inserted into a through hole 10 that is divided into multiple equal parts around the piston 5 from the side where the sub-piston 6 is not present. It is screwed onto the sub-piston 6 with a bolt 8 inserted therethrough in a water-tight manner.

A compression coil spring 11 is interposed between the crown portion 9 and the side surface of the piston 4 on the axis of the connecting bolt 8, and the spring force causes the side surface of the sub-piston 6 to come into close contact with the side surface of the piston 4 via the connecting bolt 8. ing.

Reference numeral 12 denotes an outer cylinder, whose rear (right side in Figure 1) is fixed to the front side of the cylinder main body 1, and the inner and outer circumferential surfaces are enlarged near the front end (left side in Figure 1) of the outer cylinder 12. An enlarged outer cylindrical portion 12' is formed, and a lid 13 having a through hole 14 in the center is fixed to the front surface of the enlarged outer cylindrical portion 12'.

This lid body 13 may also be integrated into the outer cylinder 12 in some cases.

The back surface of this lid 13 or the inner side of the front end surface of the outer cylinder 12 with which the lid 13 is integrated is defined as an end surface 12''.

Reference numeral 15 denotes an inner cylinder which is loosely inserted into the outer cylinder 12, and the rear (right side in FIG. 1) of the inner cylinder 15 is fixed to the front of the piston rod 4.

The outer peripheral part of the front end of this inner cylinder 15 is loosely inserted into the through hole 14 of the lid body 13, and the tip thereof is provided with a plurality of grooves on the circumference.
A collet portion 16 is formed on its inner periphery and has a taper that gradually widens toward the tip.

This inner cylinder 15 is inserted into the collet part 1 by sliding of the piston rod 4.
6 appears and disappears from the through hole 14 as appropriate.

The inner cylinder 15 is separated into two parts at the inside of the enlarged outer cylinder part 12', and an enlarged inner cylinder part 17 is formed in the inner cylinder 15 on the side where the collet part 16 is provided. The inner cylinder 15 is provided with an enlarged outer inner cylinder part 18, and a protruding edge 19 facing the center is formed on the distal end surface.

Inside this enlarged outer inner cylinder part 18, the enlarged inner inner cylinder part 17
is inserted loosely and slidably only in a minute gap (Δt), and is housed in a non-removable manner by its protruding edge 19.

A compression coil spring 20 is interposed between the inner surface step of the enlarged inner inner cylinder section 17 and the inner surface step of the enlarged outer inner cylinder section 18, and the two separated inner cylinders 15 are arranged outwardly from each other. The outer stepped portion of the enlarged inner inner cylindrical portion 17 is exposed to the projecting edge 19.
, and its firing is regulated.

This enlarged outer inner cylinder part 18 slides within the enlarged outer cylinder part 12'.

As shown in the figure, the inner cylinder 15 can be separated into two parts and elastically supported by each other, or as another embodiment, the inner cylinder 15 can be integrally formed and not elastically supported. Sometimes.

Reference numeral 21 denotes a shaft rod, which is loosely inserted into the inner cylinder 15 and the piston rod 4, and whose rear end (on the right side in FIG. 1) is inserted into and fixed into the sub-piston 6.

A collet pin portion 22 is provided at the front end (left side in FIG. 1) of the shaft rod 21. The collet pin portion 22 is provided with a tapered expansion port corresponding to the inner surface of the collet portion 16 of the inner cylinder 15.

Collet pin 2 2' provided with this collet pin portion 22
may be provided separately on the shaft rod 21 as shown in FIG. 1, or may be provided integrally as shown in FIG.

Reference numeral 23 denotes a fixed mounting base, and a horizontal hole 24 is bored in the center thereof, and the shaft body 7 is inserted into the horizontal hole 24 and is pivotally supported via a bearing 25.

Reference numeral 26 denotes an outgoing port of the oil passage, which passes through the rotating shaft 7 and the sub-piston 6 from the injection hole of the mounting base 23, and enters the side surface of the sub-piston 6 (left side in Figs. 1 and 2). It is opened and communicates with the inside of the cylinder main body 1 at the rear of the piston 5 (on the right side in FIG. 1).

27 is the return port of the oil passage, from the injection hole of the mounting base 23,
It passes through the rotating shaft 7, the sub-piston 6, and the piston rod 4, is opened in front of the piston 5 (left side in FIG. 1), and communicates with the inside of the cylinder body 1.

Further, when the cylinder main body 1 is used without being rotated, the forward port 26 and the backward port 27 are provided as shown by dotted lines in FIG. 1.

The central axes of the piston 5, piston rod 4, sub-piston 6, mounting base 23, outer cylinder 12, inner cylinder 15, and shaft rod 21 are arranged to be on the central axis of the cylinder body 1. .

28 is an unprocessed workpiece such as a bevel gear or a spur gear with a shaft hole formed therein.

The diameter of this shaft hole is approximately the same as the outer diameter of the collet portion 16 at the tip of the inner cylinder 15, and is shaped to allow loose insertion.

This cylinder main body 1 is fixed only in the axial direction by a device not shown, but rotates together with the piston 5, shaft rod 21, etc.

Only this mounting base 23 does not rotate and slides along with the sub-piston 6 only in the axial direction through a dovetail groove provided on a gear cutter (not shown).

Next, the effects will be explained.

First, to explain the operation and effect in detail, a mechanism (not shown) presses the workpiece 28 against the front surface of the lid 13 so that its shaft hole is on the central axis of the inner cylinder 15,
At this time, the inner cylinder 15 and the shaft rod 21 are retracted and set from the lid body 13 (see FIG. 2).

Next, when a hydraulic device (not shown) is activated and its solenoid valve is switched to allow pressure oil to flow into the outward port 26, the piston 5 moves to the left with respect to the cylinder body 1, as shown in FIGS. 2 and 3. The piston 5 slides to the left via the piston rod 4 until the outside of the ridge 19 at the end of the enlarged outer inner cylinder portion 18 of the inner cylinder 15 abuts against the end surface 12'' of the outer cylinder 12.

At the same time, the collet part 16 of the inner cylinder 15 is inserted into the shaft hole of the workpiece 28 via the piston rod 4, the connecting port 8 is inserted from the piston 5, and the collet pin part 22 of the shaft rod 21 is inserted into the shaft hole of the workpiece 28 via the sub-piston 6. .

During insertion at this time, since both the collet part 16 and the collet pin part 22 move at the same speed, the collet part 16 does not spread in the radial direction and is fitted slightly loosely.

Actually, the outer diameter of the collet part 16 is 0.003 smaller than the shaft diameter.
It is formed to be 0.005 inch smaller.

Also, since it is automatically inserted, the workpiece 2
The center axis of the shaft hole 8 is an inner cylinder 15 having a collet portion 16.
It often happens that the device is inserted at an angle off the central axis of the device.

When it is tilted and shifted in this way, the outer surface of the lid body 13 and
A minute gap (Δl) is created at the end surface of the workpiece 28 (see FIG. 3).

This insertion stroke stops when the protruding edge 19 abuts against the end surface 12''.

Even if the hydraulic pressure is further increased to the outward port 26, this time,
The piston 5 cannot move to the left.

That is, the end surface 12 of the outer cylinder 12 that is fixed (in the axial direction)
The ridge 19 of the inner cylinder 15 is in contact with the inner cylinder 15.
, the piston 5 is stopped in the left direction via the piston rod 4.

Therefore, hydraulic pressure is applied to the side surface of the sub-piston 6 (left side in FIG. 3), compresses the compression coil spring 11 against the elasticity of the compression coil spring 110 of the connecting port 8, and the S sub-piston 6 moves to the right side. It will slide a little (see Figure 4).

At the same time, the shaft rod 21 fixed to the sub-piston 6 moves to the right.

At the same time, the collet pin portion 22 pushes out the collet portion 16 at the end of the inner cylinder 15 and expands the collet pin portion 22.
The force also acts in the axial direction and slides through the axial hole of the workpiece 28.

This is an enlarged inner inner cylindrical part 17 in which a collet part 16 is provided.
This is because the compression coil spring 200 can be compressed against the elasticity of the compression coil spring 200 and moved to the right by a small gap (Δt).

Just before this collet part 16 moves slightly to the right, the workpiece 2
Even if the central axis of the shaft hole 8 is slightly shifted or tilted with respect to the central axis of the collet part 16, the lid body 13 and the outer cylinder 12 can be fixed by moving the collet part 16 to the right. Therefore, the collet part 16 is pulled out from the shaft hole of the workpiece 28, and even if the shaft hole of the workpiece 28 is tilted or the center axis is misaligned due to this action,
It is corrected so that it lies exactly on the central axis of the inner cylinder 15 having the collet part 16.

This pulling action is performed at the same time as the sub-piston 6 moves to the right (see FIG. 4).

When the end of the enlarged inner inner cylinder part 17 hits the rear end of the enlarged outer cylinder part 12' of the separated inner cylinder 15 (see FIG. 4), the enlarged inner inner cylinder part 17 having the collet part 16 becomes the enlarged outer inner cylinder part. 18, that is, the inner cylinder 15 having the collet part 16 is fixed to the outer cylinder 12 in the same way as if the inner cylinder 15 having the collet part 16 was fixed to the enlarged outer inner cylinder part 18.

Furthermore, when hydraulic pressure is applied to the outgoing port 26, hydraulic pressure is applied to the side surface of the sub-piston 6 as described above, and a force is applied that compresses the compression coil spring 11 and slides the sub-piston 6 to the right.

Then, since the collet part 16 is fixed, the collet pin part 22 of the shaft rod 21 fixed to the sub-piston 6 acts to spread the collet part 16, and strongly clamps it to the shaft hole of the workpiece 28. The workpiece 28 is then fixed to the collet section 16 (see FIG. 5).

In addition, the inner cylinder 15 is not separated in the middle but is integrated into one Σ
In this case, the collet part 16 is fixed to the outer cylinder 12, and when the collet pin part 22 moves slightly to the right of the shaft 21, the collet part 16 is enlarged and the workpiece 28 is fixed to the collect part 16.

In addition, in order to remove the workpiece 28 that has been machined into a gear or the like after it has been installed and the workpiece 28 has been gear-cut by a mechanism (not shown), if pressure oil is put into the return port 27, the hydraulic pressure on the outbound side will be reduced. At that moment, the compression coil spring 110
The elastic force is restored, and the sub-piston 6 moves a little to the left via the connecting bolt 8 and comes into close contact with the surface of the piston 5. At the same time, the shaft rod 21 fixed to the sub-piston 6 is moved to the left and the shaft rod The collet pin part 22 at the end of the collet part 21 is released from the clamped state from the collet part 16, and at the same time the compression coil spring 20
As a result, the collet portion 16 moves to the left by a minute gap (Δt), and at this time, the workpiece 28 also moves a little away from the end surface of the lid body 13.

This series of actions takes place the moment pressure oil is injected into the return port 27.

Then, the piston 5 is moved to the right by the pressure oil, and the collet portion 16 of the inner cylinder 15 is pulled out from the workpiece 28 via the piston rod 4, so that the workpiece 28 falls.

Next, to describe the effect, in the invention described in the first claim, by injecting pressure oil into the forward port 26, after the piston 5 moves to the left and stops, the sub piston 6 moves slightly to the right. At the same time, the shaft rod 21 fixed thereto can be moved slightly to the right.

In this way, complex movements can be made with the simple operation of applying oil in only one direction.

For this reason, when the piston 5 moves to the left, the collet part 16 of the inner cylinder 15 is inserted into the shaft hole of the workpiece 28 via the piston rod 4, and then the collet pin part 22 of the shaft rod 21 moves slightly to the right. The collet section 22 is then expanded, and the workpiece 28 is firmly attached to the collet section 16.

Further, in the invention set forth in the second claim, the operation and effect of the invention set forth in the first claim are achieved, and when the shaft rod 21 is slightly moved to the right, the collet part 16 together with the collet pin part 22 can be moved.
Move a little to the right.

That is, this collet portion 16 is pulled out from the shaft hole of the workpiece 28.

Even if the center axis of the shaft hole of the workpiece 28 is slightly distorted or tilted with respect to the center axis of the inner cylinder 15 of the collet section 16 immediately before this pulling action, the workpiece 28 will be The central axis of the shaft hole, the collet part 16, and the inner cylinder 1
The central axes of the collet parts 5 coincide with each other, or the inclination of the central axes is in an accurate position, and in this state, the workpiece 28 is clamped strongly by the collet pin part 22 and the collet part 16, and the workpiece 28 is attached.

Therefore, even when the workpiece 28 is automatically attached to the collet part 16, it can always be set in an accurate position, and even when turning the workpiece 28 into gears, etc., it can always be processed with precision, and no defective products will be processed. It has the advantage that it can be made into a good product that does not emit abnormal noise even when attached to a machine or the like.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional side view of the present invention, FIGS.
The figure is a schematic longitudinal sectional side view of the main part of the present invention in which a workpiece is clamped, and FIG. 6 is a perspective view of the collet section at the tip of the inner cylinder. DESCRIPTION OF SYMBOLS 1...Cylinder main body, 4...Piston rod, 5...Piston, 6...Sub-piston, 12...Outer cylinder, 15 ...Inner cylinder, 16...Collet part, 11...Enlarged inner inner cylinder part, 18...Enlarged outer inner cylinder part, 19
...Protrusion, 21 ... Uniaxial rod, 22 ...
・This is the collet pin part.

Claims (1)

[Claims] 1. A flange-shaped piston 5 in the middle of a hollow piston rod 4.
The piston 5 is provided in a hydraulic cylinder main body 1 so as to be able to reciprocate, and a cylindrical sub-piston 6 whose rear end is sealed is loosely inserted into the rear outer periphery of the piston rod 4. The front outer periphery of the cylinder 4 slidably passes through the front wall hole of the cylinder main body 1, and the outer periphery of the sub-piston 6 slidably penetrates the rear wall hole of the cylinder main body 1, so that the piston 5 and the sub-piston 6 are attached so as to be pulled together, and an outer cylinder 12 is provided in the axial direction in front of the cylinder main body 1,
The inner cylinder 15 is inserted loosely into this interior, and one end of the inner cylinder 15 is fixed in front of the piston rod 4.
One end of the shaft rod 21 that moves inside is fixed inside the sub piston 6, and the inner cylinder 15, a collet part 16, and a collet part 16 at the front end of the shaft rod 21,
A workpiece mounting device characterized in that collet pin portions 22 are formed respectively. 2 A flange-shaped piston 5 is placed in the middle of the hollow piston rod 4.
The piston 5 is provided in a hydraulic cylinder main body 1 so as to be able to reciprocate, and a cylindrical sub-piston 6 whose rear end is sealed is loosely inserted into the rear outer periphery of the piston rod. The front outer periphery of the cylinder body 1
Inside the front wall, the outer periphery of the sub-piston 6 is connected to the cylinder body 1.
The piston 5 and the auxiliary piston 6 are attached to each other so as to be tensioned, and an outer cylinder 12 is provided in the axial direction of the front force of the cylinder body 1. The inner cylinder 15 is loosely inserted, the rear end of which is fixed to the front of the piston rod 4, and the rear end of the shaft rod 21, which is loosely inserted into the inner cylinder 15 and the piston rod 4, is fixed inside the sub-piston 6, and the inner cylinder 15 is fixed to the front of the piston rod 4. , a collet part 16 and a collet pin part 22 are formed at the front end of the shaft rod 21, and the inner cylinder 15 is separated into two parts in the middle of the inner cylinder 15, and the inner cylinder 15 on the side where the collet part 16 is provided is separated into two parts. The enlarged inner inner cylinder part 17 is located at the rear, and the rear inner cylinder 15 is
A projecting edge 19 is formed inward at the front end, and an enlarged outer inner cylinder part 18 is formed which is slightly longer than the enlarged inner inner cylinder part 17.
The enlarged inner inner cylinder part 17 is inserted into this enlarged outer inner cylinder part 18 so that the enlarged inner inner cylinder part 17 can slide a little and come into contact with the ridge 19 when it moves forward. A workpiece mounting device characterized in that a compression coil spring 20 is interposed in the portion 17, and the enlarged inner inner cylinder part 17 is resiliently supported in a state of protruding forward with respect to the enlarged outer inner cylinder part 18.