JP2584206Y2 - Work holding device - Google Patents

Description

[Detailed description of the invention]

[0001]

In the present invention, the work to be forged is gripped, the work is set at a predetermined position on a work table such as a lower die of a forging machine from a work supply part, and the work after forging is removed. The present invention relates to a work holding device used to remove a work from a work table of a forging machine.

[0002]

2. Description of the Related Art FIG. 4 is a plan view of a conventional work gripping device.
3 is supported on a support shaft 35 so as to be openable and closable, and a pinion gear 36 rotatably fitted to the support shaft 35 is integrally provided at a base end of the arm 33.
, A rack 37 is engaged. By moving the rack 37 in a linear direction by an air cylinder 38, the arm 33 is opened and closed, and the work W is gripped. Although not shown, a pair of arms are rotatably supported on a single support shaft like scissors or clothespins, and gripping claws are provided at the distal ends of the arms, respectively. In some cases, a cylinder or the like is interposed between the ends, and the space between the gripping claws is opened and closed by the contracting operation of the cylinder on the base end side.

[0003]

As shown in FIG. 4, the work holding device which is opened and closed by a rack 37 and a pair of pinion gears 36 has the following problems. (1) Since the diameter of the pinion gear 36 is limited, it is not possible to secure a large gripping force. (2) The atmosphere of the forging workshop is a very high temperature atmosphere because the workpiece is heated to a high temperature.
High-temperature spark-like metal powder or metal pieces are flying up, and precise mechanisms such as pinion gears and racks that mesh with a large number of teeth are significantly affected by thermal expansion or powder biting. Easy to be damaged. (3) Also, due to the above-mentioned thermal expansion and backlash,
The rotational positions of the left and right pinion gears 36 are likely to be shifted, which causes the left and right arms 33 to be unevenly opened, thereby deteriorating the work gripping performance. Especially both left and right arms 33
In this case, the phenomenon of swinging to the left and right around the axis of the pinion gear occurs, and the gripping state is likely to be unstable. Further, even with a structure in which a scissor or a clothespin is combined with a cylinder or the like, both arms are likely to swing right and left around the support shaft, and the gripping state is likely to be unstable. The present invention provides a workpiece gripping device that has a small number of failures, has a strong gripping force, has a simple structure, has a precise gripping position, and has a stable gripping state, even in an atmosphere of high temperature and a lot of metal powder. It is intended to be.

[0004]

In order to achieve the above-mentioned object, according to the present invention, an arm supporting slide table is provided so as to be movable in the front-rear direction so as to approach and separate from a work set position of a forging machine. A pair of left and right vertical support shafts are provided on the slide table, and the respective arms are rotatably supported on each support shaft,
A work gripping claw is provided at the distal end of each arm, a cam pin is erected at the base end of each arm, and a slide plate having a pair of left and right cam grooves to be engaged with the two cam pins is placed on a slide table in the front-rear direction. The arm opening / closing cam mechanism is constituted by being provided movably, and the gripping claw is opened / closed by rotating both arms symmetrically by movement of the slide plate.

[0005]

The two arms are rotated by the cam action of the cam groove and the cam pins by moving the slide plate on the arm supporting slide base by the drive mechanism, and the left and right sides of the gripping claws are evenly opened and closed. . Thus, the work is held and released. Further, by moving the arm supporting slide table, the work held by the holding claws is transferred between the forging machine and the work supply table.

[0006]

FIG. 1 is a side view of a work gripping apparatus to which the present invention is applied. In FIG.
A press-type forging machine, in which a work table (lower die) 3 for mounting a work W on a base 2 is fixed,
The upper die 7 is mounted on the plunger 6 of the head 5,
By lowering the upper die 7, the work W is formed with a high pressing force. Assuming that the arrangement side of the forging machine 1 is the front side, the work supply table 10
Are arranged, and the work holding device T is arranged on the mounting table 11 on the rear side.

The work gripping device T has a gripper 14 at its front end.
A pair of arms 13, a cam mechanism 15 for opening and closing the arms 13 right and left, and the arms 13.
And a moving air cylinder 20 for moving the sliding table 16, a cam air cylinder 25 for moving the sliding plate 23, and the like. ing.
A pair of left and right guide rails 19 extending in the front-rear direction is laid on the mounting base 11, and the moving air cylinder 20 is disposed behind the guide rails 19. The arm support slide base 16 is mounted on the guide rails 19. It is mounted via a slider 18 and connected to a moving air cylinder 20,
The air cylinder 20 is horizontally moved in the front-rear direction by the expansion and contraction operation of the air cylinder 20.

A pair of cam operation rails 21 parallel to the rails 19 are laid on the arm support slide 16 and the cam air cylinder 25 is provided at the rear. On the rail 21, a cam slide plate 23 is movably mounted via a slider 22,
The slide plate 23 is connected to a cam air cylinder 25 provided on the slide base 16.

In FIG. 2 showing a plan view, the left and right arms 13 are rotatably supported by vertical support shafts 27, respectively. The arm support slide 16 is fixed.

The cam mechanism 15 includes the slide plate 23,
A cam air cylinder 25, a pair of left and right cam grooves 28,
It consists of a pair of left and right cam pins 29. Each cam pin 29 is formed at the rear end of each arm 13 so as to protrude upward, and each cam groove 28 has a symmetrical “C” shape such that the left-right interval becomes narrower toward the rear. The cam pins 29 are formed on the slide plate 23, respectively.
Is engaged.

A gripping claw 14 at the front end of each arm 13 is detachably fixed to the arm 13 with a bolt or the like.
One gripping claw 14 has a V-shaped gripping surface, and the other gripping claw 14 has a semi-circular projection shape. The projection is supported at three points, one point.

Next, the operation will be described. As shown in FIG. 3, by extending the cam air cylinder 25 and advancing the slide plate 23 on the arm supporting slide base 16, the cam action of the cam groove 28 uniformly reduces the distance between the two pins 29. Thereby, both arms 13 are rotated in the opening direction,
Open between the gripping claws 14. Conversely, the cam air cylinder 25
By retracting the slide plate 23,
By the action of the cam groove 28, the left and right pins 29 are evenly spread between the two pins 29, whereby the arms 13 are rotated in the closing direction, the gap between the gripping claws 14 is closed, and the workpiece W is gripped. In FIG. 2, by extending the moving air cylinder 20, the slide base 16 is advanced to move the gripping claws 14 to the position of the work table 3, and conversely, the moving air cylinder 20
Is contracted, the slide table 16 is retracted, and the gripping claws 14 are moved to the position of the work supply table 10.

The forging work W is handled, for example, in the following manner by utilizing the forward / backward movement by the moving air cylinder 20 and the arm opening / closing operation by the cam action of the cam air cylinder 25 as described above. At the retreat position, the unprocessed work W on the work supply table 10 is grasped, the slide table 16 is moved forward, the arm 13 is opened, the work W is set on the work table 3, and the slide table 16 is moved backward. After forging, the slide table 16 is again moved forward to grip the work W, and the slide table 16 is moved backward to move the work supply table 10.
Return the forged work to the top. By the forging operation, the outer diameter of the workpiece W is changed from the size before the forging shown by the solid line to the size shown by the imaginary line as shown in FIG. 3. The cam action of the cam groove 28 and the cam pin 29 ensures that the arms 1
3 can be opened and closed, and the work W can be firmly gripped.

[0014]

[Other Embodiments] As a drive mechanism for moving the slide base 16 and the slide plate 23, various actuators such as a hydraulic cylinder can be used.

[0015]

As described above, in the present invention, the arm support slide base 16 is arranged so as to be movable in the front-rear direction so as to approach and separate from the work set position of the forging machine. A pair of vertical support shafts 27 are provided, each arm 27 is rotatably supported on each support shaft 27, a work gripping claw 14 is provided at a distal end of each arm 13, and a cam is provided at a base end of each arm 13. Pins 29 are erected, and one slide plate 23 is provided on the slide base 16 so as to be movable in the front-rear direction.
The arm opening and closing cam mechanism 15 is formed by forming a pair of left and right cam grooves 28 that engage with the slide plate 2.
The movement of 3 causes both arms 13 to rotate symmetrically to open and close the gripping claws 14, so that there are the following advantages. (1) Since a pair of left and right pins 29 and a pair of right and left cam grooves 28 engaging with the pin 29 constitute an arm opening / closing mechanism having a cam structure, the structure is compared to a conventional rack and pinion type arm opening / closing mechanism. It is simple, has improved durability, and has few failures even in a high-temperature forging workshop atmosphere. (2) Compared with the conventional scissors system or rack and pinion system, which is greatly affected by backlash, even in a high-temperature forging workshop atmosphere, it is possible to secure the uniformity of the opening of the arm 13 and the accurate gripping position, and to the right and left. Can be prevented, the gripping state is stabilized, and the workpiece gripping performance is improved. (3) The pair of arms 13 are supported on separate support shafts 27, respectively, and a pair of cam grooves formed on one slide plate 23 are provided on cam pins 29 erected on both arms 13 as opening and closing mechanisms. Since the cam mechanism having the engagement of the arm 28 is employed, compared with the conventional link-type opening / closing mechanism in which a pair of arms are respectively connected to a retractable rod or the like via a link, the rattle of the arm is increased. And the uniformity of the opening of the arm in the left and right can be ensured, and the gripping state is stable. (4) The gripping force can be easily increased by adjusting the arm ratio using the support shaft 27 as a fulcrum as compared with the conventional rack and pinion type.

[Brief description of the drawings]

FIG. 1 is a side view of a work holding device to which the present invention is applied.

FIG. 2 is a plan view of FIG.

FIG. 3 is a partial plan view of FIG. 1 showing a state in which an arm is open.

FIG. 4 is a partial plan view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Forging machine 13 Arm 14 Gripping claw 15 Cam mechanism 16 Slide stand 23 Slide plate 27 Support shaft 28 Cam groove 29 Cam pin

Claims (1)

(57) [Scope of request for utility model registration] An arm supporting slide base is disposed so as to be movable back and forth so as to approach and separate from a work setting position of a forging machine, and a pair of right and left vertical support shafts is mounted on the slide base. The arm 13 is provided on each support shaft 27.
Are rotatably supported, and a work gripping claw 14 is provided at the distal end of each arm 13, and a cam pin 2 is provided at the base end of each arm 13.
9 are erected, and one slide plate 23 is provided on the slide base 16 so as to be movable in the front-rear direction.
The cam mechanism 28 for opening and closing the arm 15 is formed by forming a pair of left and right cam grooves 28 that engage with the two cam pins 29.
And the two arms 13 are moved by the movement of the slide plate 23.
The workpiece gripping device is characterized in that the workpiece is rotated symmetrically to open and close the gripping claws 14.