JPH0686841U - Work gripping device - Google Patents

Abstract

(57) [Summary] [Purpose] In a work holding device for holding a work for forging, there are few failures, a strong holding force, a simple structure,
Moreover, it is an object of the present invention to provide a work gripping device having a correct gripping position and a stable gripping state. [Arrangement] An arm supporting slide base 16 that can move toward and away from a work set position of a forging machine, and an openable and closable support via a vertical support shaft 27 on the slide base 16 and a work piece at the tip. A pair of arms 13 having grip claws 14 is provided, and as a mechanism for opening and closing the arms 13, a slide plate 23 movably provided on an arm supporting slide base 16 and one of the arms 13 have a cam groove 28. And a cam pin 2 that engages with the cam groove 28 on the other side.
By forming 9, the cam mechanism 15 for opening and closing the arm is configured, and the movement of the slide plate 23 causes the arm 13 to move.
It is designed to open and close.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention grasps the work to be forged, sets the work from the work supply part to a predetermined position on the work table such as the lower die of the forging machine, and then, after the forging, removes the work from the work table of the forging machine. It relates to a work gripping device used for removing.

[0002]

[Prior art]

 FIG. 4 shows a plan view of a conventional work gripping device. A pair of left and right arms 33 having gripping claws 34 are supported on a support shaft 35 so as to be openable and closable. A pinion gear 36 rotatably fitted to the support shaft 35 is integrally provided, and a rack 37 is engaged with both the pinion gears 36. By moving the rack 37 in the linear direction by the air cylinder 38, the arm 33 is opened and closed to hold the work W. Further, although not shown, a pair of arms are rotatably supported by one support shaft like scissors or clothespins, and gripping claws are provided at the tip ends of the arms, respectively. There is also one in which a cylinder or the like is interposed between the end portions, and the space between the gripping claws is opened and closed by the contraction operation of the cylinder on the base end side.

[0003]

[Problems to be solved by the device]

 As shown in FIG. 4, the work gripping device that opens and closes by the rack 37 and the 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 work is heated to a high temperature, and moreover, high-temperature fire-like metal powder or metal fragments are flying up. With a precision mechanism such as a pinion gear and a rack that meshes with a large number of teeth, the effects of thermal expansion, powder entrapment, etc. become prominent and are easily damaged. (3) Further, the rotational positions of the left and right pinion gears 36 are likely to deviate due to the thermal expansion and backlash, which makes the openings of the left and right arms 33 uneven and reduces the work gripping performance. . In particular, the left and right arms 33 tend to swing to the left and right around the pinion gear shaft center, and the gripping state tends to become unstable. Further, even in a structure having a combination of scissors or clothespins and a cylinder or the like, both arms are likely to swing to the left or right around the support shaft, and the gripping state is likely to be unstable. The present invention provides a work gripping device that has few failures, has a strong gripping force, has a simple structure, and has an accurate gripping position and a stable gripping state even in an atmosphere of high temperature and a large amount of metal powder. The purpose is to do.

[0004]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides an arm supporting slide base that can move toward and away from a work set position of a forging machine and the like, and can be opened and closed via a vertical spindle on the slide base. A pair of arms that are supported and have a work gripping claw at the tip, and as a mechanism for opening and closing the arms, a cam is provided on one of the slide plate and the arms that are movably provided on the arm support slide base. A groove is formed and a cam pin that engages with the cam groove is formed on the other side to form an arm opening / closing cam mechanism, and the arm is opened / closed by the movement of the slide plate.

[0005]

[Action]

 When the slide plate is moved by the drive mechanism on the arm support slide base, the cam action of the cam groove and the cam pin causes both arms to rotate, so that the grip claws are opened and closed evenly on the left and right. Thereby, the work is gripped and released. Further, by moving the arm supporting slide base, the work gripped by the gripping claws is transferred between the forging machine and the work supply base.

[0006]

【Example】

 FIG. 1 shows a side view of a work gripping device to which the present invention is applied. In FIG. 1, the forging machine 1 is a press-type forging machine, and a work W is mounted on a base 2. The work table (lower die) 3 to be placed is fixed, the upper die 7 is attached to the plunger 6 of the head 5, and the upper die 7 is lowered so that the work W is formed with a high pressing force. Has become. Assuming that the arrangement side of the forging machine 1 is the front side, the work supply table 10 is arranged on the rear side of the forging machine 1, and the work holding device T is arranged on the attachment table 11 on the rear side thereof.

The work gripping device T includes a pair of arms 13 each having a gripping claw 14 at a front end thereof, a cam mechanism 15 for opening and closing the arm 13 to the left and right, and an arm 13 for the forging machine 1. And a moving air cylinder 20 for moving the slide base 16, a cam air cylinder 25 for moving the slide plate 23, and the like. Has been done. A pair of left and right guide rails 19 extending in the front-rear direction are laid on the mounting base 11, and the moving air cylinder 20 is disposed behind the guide rails 19. The arm supporting slide base 16 is mounted on the guide rails 19. When mounted on the slider 18, it is connected to the moving air cylinder 20 and is horizontally moved in the front-rear direction by the expansion and contraction of the air cylinder 20.

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

In FIG. 2 showing a plan view, the left and right arms 13 are rotatably supported by vertical support shafts 27, and both support shafts 27 are arranged at intervals in the left-right direction. It is fixed to the arm supporting slide base 16.

The cam mechanism 15 includes the slide plate 23, a cam air cylinder 25, a pair of left and right cam grooves 28, and 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 project upward, and each cam groove 28 has a symmetrical "H" shape so that the left-right interval becomes narrower toward the rear. Further, they are formed on the slide plate 23 and are respectively engaged with the cam pins 29.

The grip claw 14 at the front end of each arm 13 is detachably fixed to the arm 13 with a bolt or the like. One grip claw 14 has a V-shaped grip surface and the other grip claw 14 14 is formed in the shape of a semicircular protrusion, and is configured to support the cylindrical work W at three points, two points on the V-shaped surface and one point on the semicircular protrusion.

Next, the operation will be described. As shown in FIG. 3, by extending the air cylinder 25 for cam and advancing the slide plate 23 on the arm support slide base 16, the cam action of the cam groove 28 causes the pins 29 to be evenly left and right. When the arms 13 are contracted, the arms 13 are rotated in the opening direction to open the space between the grip claws 14. On the contrary, by contracting the air cylinder for cam 25 and retracting the slide plate 23, the action of the cam groove 28 spreads the distance between the pins 29 evenly on the left and right, thereby closing both arms 13. The workpiece W is gripped by rotating in the direction to close the space between the grip claws 14. Further, in FIG. 2, by extending the moving air cylinder 20, the sliding table 16 is moved forward to move the grip claw 14 portion to the work table 3 position, and conversely, the moving air cylinder 20 is contracted. Thus, the slide base 16 is retracted to move the gripping claw 14 portion to the work supply base 10 position.

By using 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, the forging work W is handled as follows, for example. The unprocessed work W on the work supply table 10 is gripped at the retracted position, 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 retracted. After the forging, the slide base 16 is moved forward again to grip the work W, the slide base 16 is retracted, and the work after the forging is returned to the work supply base 10. By the forging work, the outer diameter of the work W is transformed from the size before forging shown by the solid line to the size shown by the imaginary line as shown in FIG. By the cam action of the symmetrical cam groove 28 and the cam pin 29, the arm 13 can be surely opened and closed evenly on the left and right, and the work W can be firmly gripped.

[0014]

[Another embodiment]

 (1) It is also possible to form a cam mechanism by forming a cam groove on the arm 13 and forming a cam pin on the slide plate 23. (2) 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]

[Effect of device]

 As described above, according to the present invention, the arm supporting slide base 16 that can be moved toward and away from the work set position of a forging machine, and the openable and closable support is provided on the slide base 16 via the vertical support shaft 27. And a pair of arms 13 each having a workpiece gripping claw 14 at the tip thereof, and as a mechanism for opening and closing the arms 13, a slide plate 23 movably provided on an arm supporting slide base 16 and an arm 13. Of these, a cam groove 28 is formed on one side, and a cam pin 29 that engages with the cam groove 28 is formed on the other side, thereby configuring the arm opening / closing cam mechanism 15 and by moving the slide plate 23. Since the arm 13 is opened and closed, there are the following advantages. (1) Since a pair of left and right pins 29 and a pair of left and right cam grooves 28 that engage with the left and right pins constitute an arm opening / closing mechanism of a cam structure, compared to a conventional rack and pinion type arm opening / closing mechanism. The structure is simple, the durability is improved, and there are few failures even in the high temperature forging workshop atmosphere. (2) Compared to the conventional scissors method or the rack and pinion method, which is greatly affected by backlash, even when the temperature of the forging workshop is high, it is possible to ensure the evenness of opening and closing of the arm 13 and an accurate gripping position. It is also possible to prevent the swinging phenomenon to, stabilize the gripping state, and improve the work gripping performance. (3) The gripping force can be easily increased by adjusting the arm ratio with the support shaft 27 as the fulcrum as compared with the conventional rack and pinion type.

[Brief description of drawings]

FIG. 1 is a side view of a work gripping 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]

 1 Forging Machine 13 Arm 14 Grip Claw 15 Cam Mechanism 16 Slide Stand 23 Slide Plate 27 Spindle 28 Cam Groove 29 Cam Pin

Claims (1)

[Scope of utility model registration request] 1. A slide base for arm support which can move toward and away from a work set position of a forging machine, and an openable and closable support via a vertical spindle on the slide base, and a work grip at the tip. A pair of arms having claws,
As a mechanism for opening and closing the arm, of the slide plate and the arm movably provided on the arm support slide base,
An arm opening / closing cam mechanism is configured by forming a cam groove on one side and a cam pin engaging with the cam groove on the other side, and the arm is opened / closed by the movement of the slide plate. A work gripping device characterized by the above.