JPH0741327B2 - Beam clamp device for transfer press - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a beam clamp, unclamp, or connecting device for a beam in a transfer press.

[0002]

2. Description of the Related Art In a transfer press, a plurality of molds are mounted on a moving bolster on a press bed, and when the molds are replaced, the moving beam is also removed together with the molds so that another mold and its molds can be removed. It is often the case that the moving beam attached is fed instead and the moving beam and the fixed beam attached to the press from both sides toward the center are connected to the press. For this connection, conventionally, a hole is provided at the tip of the fixed beam, and a pin that fits into this hole is provided at the tip of the moving beam so that the moving beam is lifted and separated from the fixed beam when the moving bolster is carried out. It was However, the connection force is weak only by such fitting of the pin and the hole, and the moving beam rotates around the axis during the operation of the press to cause a problem in the accuracy of the product, and the lift for pulling out the pin from the hole. It has been pointed out that the amount is large and difficult to remove. In order to solve this problem, quite a lot of conventional techniques have been proposed in which various technical features are added instead of merely fitting pins and holes. For example, Japanese Utility Model No. 64-33320 and Japanese Utility Model No. 6
No. 3-163221, No. 59-157230, No. 57-56528, and No. 58-57399. Each of them has its own characteristics, of which the prior art disclosed in Japanese Utility Model Laid-Open No. 58-57339 will be briefly described.

This prior art is shown in FIGS. 3 (A) and 3 (B). FIG. 3A shows the state of the gan clamp, and FIG. 3B shows the state of the clamp. At the end of the fixed feed bar (fixed beam) B1a, a cylinder 4a is installed slidably in the longitudinal direction, and when pressure oil is supplied from the port 64a to the tip of the cylinder 4a, the cylinder 4a advances and the fixed feed is performed. It projects from the end face of the bar. When the pressure oil is discharged from the port 64a, it moves backward due to the biasing force of the spring 104. The piston 3a is fitted in the cylinder 4a, and moves backward when the pressure oil is supplied from the port 68a and moves forward when the pressure oil is discharged.
The clamp rod 1a and the piston rod 102 are connected to the front and rear of the piston 3a, and the tip of the clamp rod is provided with a T-shaped clamp head 11a. The end face of the moving feed bar (moving beam) B2a is provided with a concave portion 8a into which the convex portion 7a at the tip of the cylinder is fitted. Further, the vertical cross section is T-shaped, and a horizontal groove 10 in which a T foot is opened to the end face.
3 is provided on both side surfaces in the width direction. In this conventional technique, the supply and discharge of pressure oil from two ports are combined with the balance of the urging forces of two springs to connect and disconnect both feed bars. At times, the cylinder 4a of the fixed feed bar is retracted by the spring force, and the clamp head 11a is advanced by the spring 101, and the clamp head is inserted into the groove 103 in the direction perpendicular to the paper surface of FIG. Then, as shown in FIG. B, the moving feed bar is restrained in the longitudinal direction by the pulling force of the clamp head and is strongly connected.

[0004]

In a transfer press, a moving beam (moving finger bar) together with a mold on a moving bolster is moved in a direction perpendicular to its own axial direction (hereinafter referred to as left-right direction) (hereinafter referred to as front-back direction). It is generally configured to move to a fixed beam (fixed finger bar) facing each other by being moved to a predetermined position. In order to connect, it is necessary that the tip of the clamp rod protruding from the tip of the fixed beam has a protrusion for engaging with the recess or hollow portion at the tip of the moving beam, and usually the tip is In many cases, the T-shaped branched portion is formed as a clamp head. In any case, since it is necessary for the moving beam to move at a right angle and to fit the tips of both to the fixed beam projecting the protruding clamp head,
In order to hesitate and move the clamp head, it is necessary to cut out a concave portion having a T-shaped cross section at the tip of the moving beam over the entire width in the front-rear direction of the beam. Therefore, a very strict correlation of accuracy is required between the shape and size of the clamp head and the shape and size of the recess of the moving beam that moves by moving it away. It is possible that they may collide with each other and cannot move the moving beam to a predetermined position. Therefore, extremely high precision is required for processing the members and assembling the members, which is a great burden in manufacturing the device.

A problem with precision is the control of the back and forth movement of the moving beam and its distance, and the control of the distance and the timing of the left and right movement of the clamp head of the fixed beam. Since the protruding tip of the clamp head fits into the recess of the tip of the moving beam and moves back and forth, when the tip of the clamp head moves left and right due to engagement, they collide with each other. There is a high concern that the device will be damaged. That is, unless the relative movements of the two beams are accurately controlled, they cannot be connected, the control becomes complicated, the manufacturing of the device is complicated, and the cost burden is difficult to ignore.

In order to solve the above-mentioned problems, the present invention requires a simple connection of the fixed beam and the working beam without requiring severe mechanical precision, and has a very large connecting force and high operational reliability. An object of the present invention is to provide a beam clamp device for a transfer press.

[0007]

A beam clamp device for a transfer press according to the present invention includes a movable piston 4 which is horizontally slidable in a case 6 of a fixed beam B1 by a driving force from the rear surface, and the movable piston 4. A cam shaft 3 that is rotatably fitted therein, a clamp piston 2 that is connected to the cam shaft 3 and slides in a case, and is rotatable into the clamp piston 2 while rotating together with the cam shaft 3. And a clamp rod 1 co-moving in a horizontal direction, the front end of which includes a clamp head 11 having a substantially T-shaped cross section,
Since the engaging pin 5 which is commonly engaged with the lateral groove 61 formed in a part of the case and the spiral groove 31 formed in the outer surface of the cam shaft 3 is fixed by penetrating the movable piston 4. Solved the problem.

Further, the port 6 is an element that specifically operates connection and disconnection of the moving beam and the fixed beam.
By the hydraulic pressure in the oil chamber 65 formed by the oil pressure from the port 63 and the rotation of the clamp head 11 accompanying the movement of the movable piston 4 to the moving side by the hydraulic pressure in the oil chamber 65 formed by the oil injection from 4 An oil chamber 67 is formed by pressing the clamp piston 2 to the fixed side, and the connection is also released by oil injection from the port 66.
Movement of the clamp piston 2 to the moving side by pressing
Most preferably, the clamp head 11 is rotated by the movement of the movable piston 4 to the fixed side by pressing the oil chamber 41 formed by the oil injection from the port 68.

[0009]

The clamp head 11 at the tip of the fixed beam, which is loosely fitted in the recess at the tip of the moving beam in the case, is hydraulically drawn to the fixed side in a state where the T-shaped head is tilted sideways, for example. Crimp on the inner surface of the outer lid,
On the other hand, the cam shaft 3 adjacent to the fixed side of the clamp piston into which the clamp rod is fitted, and the outer movable piston 4 engaged via the engaging pin 5 are pressed by the fixed side to the movable side. Energized, the two beams are firmly connected.
To release the connection, reverse hydraulic pressure is applied to the clamp piston 2 to advance the clamp head 11 and the clamp piston 2 to the moving side, and in conjunction with this movement, the rear camshaft 3 and the movable piston 4 both move to the moving side. . When the clamp head 11 becomes free and loosely fits and the pressing force applied to the movable piston 4 is switched to the opposite direction, the movable piston 4 moves to the fixed side. At this time, the movable piston 4 advances together with the engaging pin 5 fitted in the lateral groove formed in the case, and the engaging pin 5 also engages with the spiral groove 31 formed in the outer periphery of the cam shaft 3. Therefore, the cam shaft 3 is swung by the movement of the engaging pin 5 and forced into the spiral groove 31 on the spot. This rotation is transmitted to the clamp rod 1 that is connected as it is, the clamp rod rotates in the clamp piston 2, and the clamp head at the tip also rotates to change the direction of the T-shaped head to the vertical direction. Get up. Here, the clamp head is horizontally moved out of the vertically long through hole opened in the outer lid of the concave portion of the moving beam tip, and the tips of both beams are completely separated from each other.

The progress of this action is shown in FIGS. 2 (A) (B) (C).
In FIG. A, the clamp rod 1 moves from the tip of the fixed beam B1 to the moving beam B.
2, the T-shaped head of the clamp head 11 stands vertically and the concave portion 8 at the tip of the moving beam.
The through-holes 82 that open to the outer lid are also in the same vertical orientation. In FIG. B, the clamp head 11 loosely fitted in the concave portion 8 is rotated in the concave portion to change its direction to a right angle and to be in a lateral direction. FIG. C shows the principle of this rotation. When the movable piston 4 is pushed to the left in the case 6 and moves, the engagement pin 5 slides along the lateral groove 61 horizontally engraved in the case, The cam shaft 3 in which the spiral groove 31 that engages with the engagement pin 5 is carved on the outer peripheral surface is shown to have a mutual relationship in which the cam shaft 3 is forced to rotate while staying at that position. In this case, it goes without saying that the vertical and horizontal directions of the through hole 82 of the clamp head and the outer cover 81 of the concave portion of the moving beam have the opposite relationship.

[0011]

1 is a vertical front view of an embodiment of the present invention, in which the upper half of the center line shows the clamped state of the fixed beam B1, and the lower half shows the unclamped state. In the clamped state, the T-shaped head of the clamp head 11 at the tip of the clamp rod 1 falls sideways and is pulled to the right in the figure. In this example, pressure oil is supplied from a port 63 penetrating the case 6 to form an oil chamber 62,
The clamp piston 2 and the clamp rod 1 are pressed rightward. The cam shaft 3 is connected to the end surface of the clamp piston 2, and a spiral groove 31 is engraved on the outer peripheral surface of the cam shaft 3, and the engagement pin 5 is engaged with the spiral groove 31.
The engaging pin 5 also penetrates the movable piston 4 and engages with a horizontal lateral groove 61 formed in the inner surface of the case 6. In addition,
The cam shaft 3 and the clamp rod 1 are integrated via the screw portion 32, and when the movable piston 4 moves left and right, the cam shaft 3 rotates on the spot and is directly connected to the rotation of the clamp rod 1. . A port 64 is opened at the fixed end of the case 6 to form an oil chamber 65, and the movable piston 4 is pressed rightward from the rear end. As long as this pressing force is applied, the cam shaft 3 can no longer move, and therefore the cam shaft 3 cannot rotate via the engagement pin 5, so the clamp rod 1
Not only in the left-right direction, but also in the circumferential direction is strongly restrained and stopped, and the beam posture is firmly maintained in a constant state.

The lower half of FIG. 1 shows an unclamped state,
The clamp head 11 has a T-shaped head standing vertically and is loosely fitted in the recess 8 in a state where it can be pulled out from the fixed beam outer lid through hole 82. The pressure oil is discharged from the oil chamber 62 formed earlier through the port 63, and conversely, the pressure oil is fed from the port 66 to form the oil chamber 67, and the clamp rod 1 is moved to the left via the clamp piston 2. The clamp head 11 is disengaged by pressing it in the direction. On the other hand, the pressure oil is discharged from the port 64 and the oil chamber 65 disappears. Instead, the port 68 is passed through the oil hole 71 that penetrates the fixed piston 7 in the axial direction.
From here, pressure oil is pressed into the oil chamber 41 inside, and the movable piston 4 is moved to the right due to this oil pressure.

[0013]

Since the present invention has the structure and operation as described above, when the moving beam moves in the front-rear direction together with the mold when the mold is replaced, the tip of the clamp rod of the fixed beam recedes. Since the light beams enter and pass at a position unrelated to the tip of the moving beam without any overlap, they cannot collide with each other. Therefore, it is not necessary to increase the mechanical processing accuracy and the assembly accuracy of the engaging parts of both, and even when both are connected or disconnected, strict time control of forward and backward movement and left and right movement is required. Nothing.

The connecting force after connecting both beams is also a very important requirement and, like many prior arts, is one of the main purposes of the present invention, but it is the present invention that controls this connecting force. In the case of the above embodiment, it is proportionally expressed by the cross-sectional area of the oil chamber 62 in FIG. From this point of view, it is recognized that the cross-sectional area of the oil chamber 62 is larger than that of any of the other prior arts, and it is considered undisputable that a highly reliable coupling force can be guaranteed. .

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing an embodiment of the present invention.

FIG. 2 is a perspective view illustrating the operation of the present invention by (A), (B) and (C).

FIG. 3 is a vertical sectional front view showing a conventional technique by (A) and (B).

[Explanation of symbols]

 1 Clamp Rod 2 Clamp Piston 3 Cam Shaft 4 Movable Piston 5 Engaging Pin 6 Case 7 Fixed Piston 8 Recess 11 Clamp Head 31 Spiral Groove 41 Oil Chamber 61 Horizontal Groove 62 Oil Chamber 63 Port 64 Port 65 Oil Chamber 66 Port 67 Oil Chamber 68 Port 81 Outer cover 82 Through hole B1 Fixed beam B2 Moving beam

Claims (2)

[Claims] 1. A fixed beam B1 of a transfer press.
In a beam clamp device for attaching and detaching a movable beam B2 and a movable beam B2, a movable piston 4 which is horizontally slidable by a driving force from a rear surface in a case 6 of a fixed beam B1 and an rotatably internally fitted inside the movable piston 4. Cam shaft 3 and the cam shaft 3
The clamp piston 2 is connected to the clamp piston 2 and slides in the case, and the clamp rod 1 is rotatably fitted into the clamp piston 2 while rotating together with the cam shaft 3 and moves horizontally together. The front end of the rod 1 is provided with a clamp head 11 having a substantially T-shaped cross section, and a lateral groove 6 formed in a part of the case.
1. A beam clamp device for a transfer press, characterized in that an engaging pin 5 that is commonly engaged with the spiral groove 31 formed on the outer surface of the cam shaft 3 penetrates the movable piston 4 and is fixed thereto. 2. The connection of both beams according to claim 1,
Rotation of the clamp head 11 accompanying the movement of the movable piston 4 to the moving side by the hydraulic pressure in the oil chamber 65 formed by the lubrication from the port 64, and the hydraulic pressure in the oil chamber 62 formed by the lubrication from the port 63. Is performed by pressing the clamp piston 2 toward the fixed side, and the connection is also released from the port 68 by moving the clamp piston 2 toward the moving side by pressing the oil chamber 67 formed by lubrication from the port 66. The beam clamp device for a transfer press, which is carried out by the rotation of the clamp head 11 accompanying the movement of the movable piston 4 to the fixed side due to the pressing of the oil chamber 41 formed by the oil injection.