JPH0366079B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a positioning device for a movable table in a press or the like.

BACKGROUND ART Conventionally, in a press machine, for example, a forging press, movement of the moving table is often performed by a hydraulic cylinder attached to the head of the press machine.
In the figure, as an example, one or two molds 2 are fixed and mounted on a movable table 1 that is horizontally movably mounted on a bed ₁₀₁ of a press machine 10. The movable table 1 is horizontally movable by a hydraulic cylinder ₃ horizontally fixed to the bed 101 of the press 10, but the mold 2 is held at the center of the press 10. To do this, it is necessary to stop the movable table 1 at a certain position. For this purpose, a limit switch 6 or the like is installed at the stopping position, and when the predetermined position is detected, the hydraulic cylinder 3 The hydraulic switching valve V that controls the supply of hydraulic pressure to the hydraulic cylinder 3 is returned to neutral, the operation of the hydraulic cylinder 3 is stopped, and the movable table 1 is stopped. However, in this case, since the movable table 1 and the mold 2 are heavy, their stopping precision is poor and requires inching, etc. Therefore, it takes a lot of time to position the movable table 1. This is the current situation.

In order to avoid this and position the moving table 1 quickly and accurately, a complicated position detection device and delicate speed control are required.
In particular, in hot forging presses, it is extremely difficult to maintain the accuracy of position detection devices and delicate speed control over long periods of time due to scale powder generated from forged products and thermal effects. .

In addition, in controlling the movement of the movable table 1 by the hydraulic cylinder 3, relief valves R are provided on the head side and the bottom side of the hydraulic cylinder 3, respectively.
1 and R2 are provided so that the movable table 1 is always held with a constant force. However, during press work, an excessive external force may act on the mold 2 in the horizontal direction, which may cause the movable table 1 to move left and right. Moreover, this phenomenon occurs quite frequently, and each time the mold 2 must be returned to the center of the press 10 by the moving table 1, this requires frequent inching operations. .

Furthermore, during the press operation, it may be necessary to temporarily shift the die 2 to the left or right for forging, but in that case, it takes time to return the die 2 to the center of the press 10 again. Requires inching operation.

In this way, press machines, especially forging presses, require positioning of the moving table during operation, but conventionally when equipped with a hydraulic cylinder for this purpose, the positioning accuracy can be maintained. There were drawbacks such as the need for complicated operations.

Problems to be Solved by the Invention In view of the above-mentioned drawbacks of conventionally known moving table positioning devices, the present invention provides a novel system that eliminates these drawbacks.
The object is to obtain an improved positioning device for a moving table in a press or the like.

Means for Solving the Problems In order to achieve this object, the present invention provides, for example, as shown in FIG. 1 of the accompanying drawings, a moving table 11 for mounting a mold 12 in a press machine 10, In order to determine the position with respect to the center of the press machine etc. 10 together with the mold 12 which is restrained and attached thereon, the press machine etc.
A moving cylinder 13 is attached to the bed 10 ₁ of 0 so as to face the moving table 11, and its piston rod 14 ₁ is connected to the moving table 11.
As a result, the movable table 11 can be moved over _the bed 10 ₁ over the entire stroke of the movable cylinder 13 .
A positioning cylinder 15 is disposed coaxially with the positioning cylinder 15, and when the piston 16 thereof is moved to the forward limit, the movable cylinder 13 holds the movable table 11 thereon via its piston 14. When moving the mold 12 so that it is positioned at the center of the press 10, etc., the movement of the moving table 11 is stopped in the middle of the process, and this stopping position is set just when the mold 12 is in the press. The present invention is characterized by a positioning device for a movable table of a press or the like, which is aligned with the center position of a press or the like.

Embodiments Hereinafter, the present invention will be described in detail based on FIGS. 1, 2 and 3 of the accompanying drawings showing embodiments thereof.

First, as shown in FIG. 1, a mold 12 is placed on a movable table 11 that is horizontally movably attached to a bed ₁₀₁ of a forging press 10, which is an example of a press machine. It is restrained and installed like this. In addition, the moving table 11
is connected by a nut 140 to the tip of a piston rod ₁₄₁ of a piston 14 of a hydraulic moving cylinder 13 horizontally fixed to the bed ₁₀₁ of the press ₁₀ , and when the piston rod ₁₄₁ is operated, the bed ₁₀₁ is moved. It is now possible to move left and right on the top. Also, in bed 10 ₁ ,
On the opposite side of the moving cylinder 13, a hydraulic positioning cylinder 15 having a shorter stroke than the moving cylinder 13 is attached, and the tip of the piston rod ₁₆₁ of the piston 16 is located on the opposite side of the moving table 11 from the moving cylinder 13. The movable table 11 can be pushed to the right as seen in FIG.

In this case, the pressure receiving area on the head pushing side of the piston 16 of the positioning cylinder 15 should be approximately 1.5 times larger than the pressure receiving area on the head pushing side of the piston 14 of the moving cylinder 13, or
In order to control the supply of hydraulic pressure to each cylinder 13, 15, a relief valve is installed between switching valves _V1 , _V2 connected to each cylinder 13, 15 and each cylinder 13, 15. The set pressures of R ₁ and R ₃ are set so that the set pressure for relief valve R ₃ is approximately 1.5 times higher than the set pressure for relief valve R ₁ . In other words, the output (pushing force) of the piston 16 of the positioning cylinder 15 is greater than the output (pushing force) of the piston 14 of the moving cylinder 13.
shall be made approximately 1.5 times larger.

In addition, in this way, by operating the switching valve V1, the moving cylinder 13 can be moved to the piston 1.
4 is movable within the range of its full stroke L1, and the piston 16 of the positioning cylinder 15 is movable within the range of the full stroke L2 by operating the switching valve V2. However, the total stroke L1 of the piston 14 of the moving cylinder 13 is the total stroke L2 of the piston 16 of the positioning cylinder 15.
It has become something bigger than that. It should be noted that normally, the piston 16 of the positioning cylinder 15 is stopped at either the retracted position to the backward limit of its stroke or the extended position to the forward limit. In this way, when the piston 16 of the positioning cylinder 15 is in the retracted position to its retraction limit, the movable cylinder 13 allows the piston 14 to move over its entire stroke L1, and accordingly Therefore, the moving table 11 is also movable within this range L1.

In this manner, when the piston 16 of the positioning cylinder 15 is extended to the forward limit of its stroke, the moving table 11 is viewed in FIG.
When moved to the left by the actuation of the piston 14 of the moving cylinder 13, the piston rod 16 of the piston 16 of the positioning cylinder 15 located on the opposite side of the moving cylinder 13 of the moving table 11 is moved.
It collides with the tip of ₁ . However, as explained earlier, the output of the piston 14 of the moving cylinder 13 is smaller than the output of the piston 16 of the positioning cylinder 15, so the moving table 11 collides with the piston rod 16 ₁ of the piston 16 of the positioning cylinder 15. Stop at the position. Furthermore, by stopping the piston 16 of the positioning cylinder 15 at its forward movement limit,
The movable table 11 can always be stopped at a fixed position. In addition, mold 1
2, the moving table 11 is the positioning cylinder 15
It shall be placed in advance so that it will be at the center of the press 10 when it stops due to the action of.

Also, during forging work, an external force may act on the die 12 in the horizontal direction, but even in this case, the movable table 11 maintains a constant position until the relief pressure of the relief valves R1 and R3 is reached. do.

Furthermore, if the horizontal load applied to the moving table 11 acts in the right direction as seen in FIG. 1 and exceeds the relief pressure of the relief valve R1,
The moving table 11 is moved to the right, but by switching the hydraulic switching valves V1 and V2 so as to push the moving table 11 against each other, the moving table 11 is moved to the moving cylinder at the moment the horizontal load is removed. The moving table 1 is moved by the 13 pistons 14.
1 is the piston rod 16 of the positioning cylinder 15
It is pushed back to the left until it collides with mold ₁ .
2 to the predetermined central position. Conversely, when the moving table 11 is pushed to the left as seen in FIG. 1 and the relief pressure exceeds the relief valve R3,
The moving table 11 moves to the left while pushing the piston rod ₁₆₁ of the positioning cylinder 15, but at the moment the load is removed, the moving table 11
is pushed back to the forward stroke end of the piston 16 of the positioning cylinder 15, and similarly stops at a predetermined center position of the press 10.

In addition, forging may be performed by shifting the die 12 to the left of the center of the press 10, but in this case, the positioning cylinder 1 is controlled by the hydraulic switching valve V2.
By removing the pushing pressure (head side pressure) of the piston 16 of No. 5 and operating the switching valve V1 of the moving cylinder 13, the piston 14 can be moved to shift the moving table 11 and the mold 12 to the left. can. At this time, the force that holds the mold 12 and the movable table 11 so that they do not move left and right is determined by the set pressures of the relief valves R1 and R2.

Furthermore, forging may be performed by shifting the die 12 to the right from the center of the press 10, but in this case,
By operating the hydraulic pressure switching conversion V1, the moving cylinder 13
By moving the piston 14 in the right direction, the movable table 11 can be shifted in the right direction. In addition, at this time, the mold 12 and the moving table 1
1 so that it does not move in the left-right direction is determined by the set pressures of the relief valves R1 and R2.

Next, a second embodiment of the present invention will be described based on FIG. 2.

In this embodiment, as in the embodiment shown in FIG. , is adapted to be moved left and right by a piston rod 241 of a piston 24 of a _moving cylinder 23 fixed to the bed ₁₀₁ of the press 10.

However, in this embodiment, the movable cylinder 23 is provided on the piston head side of the movable cylinder 23.
Hydraulic positioning cylinder 25 with a shorter stroke than 3
is integrally fixed to the coaxial center as a sub-cylinder, and the piston rod 26 of the piston 26
₁ penetrates the head cover of the moving cylinder 25,
As seen in FIG. 2, the head of the piston 24 can be pushed to the left.

In this case, the piston 2 of the positioning cylinder 25
The pressure receiving area on the head pushing side of 6 is calculated by moving cylinder 2.
3, or placed between the switching valve V3 that controls the supply of hydraulic pressure to the positioning cylinder 25 and the positioning cylinder 25. A switching valve V1 controls the set pressure of the relief valve R4 to control the supply of hydraulic pressure to the moving cylinder 23.
The pressure is set approximately 1.5 times higher than the set pressure of the relief valve R2 disposed between the cylinder 23 and the moving cylinder 23. That is, the piston 24 of the moving cylinder 23
The pushing force of the piston 26 of the positioning cylinder 25 is set to be approximately 1.5 times greater than the pulling force of the positioning cylinder 25.

In this way, the moving table 11 is movable within the range of the stroke L1 of the moving cylinder 23, and is moved left and right by operating the hydraulic switching valve V1. Further, the piston 26 of the positioning cylinder 25 is moved over the stroke L by operating the hydraulic switching valve V3.
Although the piston 26 can move within a range of 3, normally the piston 26 is stopped at a position where the inside of the cylinder 25 is retracted to the retraction limit or at a position where it is extended to the forward limit.

In this manner, in a state where the piston 26 of the positioning cylinder 25 is extended to its forward limit, when the moving table 11 is moved to the right as seen in FIG. 2 by the operation of the moving cylinder 23, the movement The movable table 11 comes to a stop at the position where the head of the piston 24 of the cylinder 23 collides with the tip of the piston rod 261 of the piston ₂₆ of the positioning cylinder 25.

The mold 12 is moved to the moving table 1 in this way.
1 is a positioning cylinder 25 which is a sub cylinder
The press 10 is placed on the moving table 11 so as to be in the center of the press 10 when the press 10 is stopped.

In this case as well, as in the case of _FIG .
It always stops at a certain position, and the horizontal load acting on the mold 12 is applied to the relief valves R2 and R.
Until the relief pressure of 4 is reached, the movable table 11 does not move in the left-right direction as seen in FIG. However, when the horizontal load acts to the right as seen in FIG. 2 and exceeds the relief pressure of the relief valve R4, the moving table 11 will move to the right. , piston 2 of the moving cylinder and positioning cylinder 23, 25
4 and 26 press against each other so that the hydraulic switching valve V
1, by switching V3, the moment the horizontal load is removed, the moving table 11 is pushed back to the left by the piston 26 of the positioning cylinder 25 until it reaches its forward limit, and thus , the mold 12 comes to be located at the center of the press 10.

Conversely, if the moving table 11 is pushed to the left as seen in FIG _. but,
The mold 12 is pulled back until it collides with the piston 26 of the positioning cylinder 25, and the mold 12 is moved again to the press 10.
It will stop at the center position.

Finally, FIG. 3 shows a third embodiment of the invention.

In this embodiment, as can be seen from this figure, a moving cylinder 23 having a positioning cylinder 25, which is a sub-cylinder in the second embodiment shown in FIG. This corresponds to the positioning cylinder 15 in one embodiment, and on the moving table 11,
Two molds 12 ₁ and 12 ₂ are fixed so as not to move in the left and right direction, and the moving table 11 is connected to a moving cylinder 23 fixed to the bed 10 ₁ of the press 10. The piston 24 can move within the range of its full stroke L1, but the piston 24 is moved from the forward limit (left end of the stroke) by the full stroke L2 of the positioning cylinder 15 and the piston 24 is retracted. positioning sub cylinder 2 from the end (right end of stroke)
It is possible to stop at two positions in front by the entire stroke L3 of No. 5.

Thus, in this embodiment, the piston rod _{16 1} of the piston 16 of the positioning cylinder 15 and the piston rod 26 ₁ of the piston 26 of the positioning sub-cylinder 25 are respectively
When the table 11 is at the forward limit, the table 11 is at the stroke L4 (=
It becomes possible to move within the range of L1-L2-L3).

In this way, in this embodiment, when the movable table 11 collides with the tip of the piston rod 16 1 of the piston 16 of the positioning cylinder ₁₅ at the forward limit and stops, the mold 12 ₁ is moved to the press 10. When the piston 24 of the moving cylinder 23 collides with the tip of the piston rod 26 ₁ of the piston 26 at the forward limit of the positioning sub-cylinder 25, the mold 12 ₂ is placed in the center of the press. It shall be placed in the center.

In this manner, in this embodiment, one of the two molds 12 ₁ and 12 ₂ can be placed in the center of the press 10 accurately and quickly.

Effects of the Invention Since the present invention has the above-described configuration and operation, it is clear that the present invention exhibits the following effects.

1 In the present invention, a moving table in a press or the like can be quickly and accurately moved to a fixed position without the need for a position detection device such as a limit switch, and without the need for complicated inching operations. that it can be moved to

2. Therefore, the mold fixed on the movable table is placed in a predetermined position such as the center of a press machine, etc.
To be able to position accurately and quickly.

3. The movable table can be firmly held with a constant force, so even if the movable table comes off due to a strong horizontal external force acting on the mold during press work, it will not dislodge once the external force is gone. , The moving table can automatically return to its original position together with the mold.

4. It should be possible to easily shift the mold from the center of the press, etc.

5. When an external force exceeding a predetermined holding force is applied to the mold or the movable table, the movable table can escape together with the mold, and the equipment can be prevented from being destroyed by the excessive external force.

etc.

[Brief explanation of drawings]

1 is a schematic diagram of the overall arrangement of one embodiment of the invention; FIG. 2 is a similar schematic diagram of a second embodiment of the invention; and FIG. 3 is a similar diagram of a third embodiment. A similar diagram, FIG. 4, is a diagram illustrating an example of a method of moving a moving table in a conventional press or the like. 10...Press machine, 11...Moving table, 1
2, 12 ₁ , 12 ₂ ... Mold, 13, 23 ... Mobile hydraulic cylinder, 14, 16 ... Piston, 15,
25... Positioning hydraulic cylinder, 16, 26...
piston.

Claims (1)

[Claims] 1. In order to position a movable table for mounting a mold in a press or the like with respect to the center of the press or the like together with a mold that is restrained and mounted on the movable table, Attach a moving cylinder and a positioning cylinder to the bed so as to face each other with a moving table in between,
The moving cylinder connects its piston rod to the moving table, the positioning cylinder makes its piston rod contact the end face of the moving table, and the stroke of the piston of the moving cylinder is
A press machine characterized in that the output (pushing force) of the piston rod of the moving cylinder is smaller than the output (pushing force) of the piston rod of the positioning cylinder, although it is larger than the stroke of the piston of the positioning cylinder. Positioning device for moving tables in etc. 2. The positioning device for a movable table in a press or the like according to claim 1, wherein the movable cylinder and the positioning cylinder are each hydraulic cylinders. 3 Fixing a movable table to the bed of a press machine, etc. in order to position the movable table for attaching a mold in a press machine, etc. to the center of the press machine, etc. together with the mold that is restrained and attached thereon. The piston rod is connected to a moving table, and the piston head side of the moving cylinder has a smaller piston stroke than the piston stroke of the moving cylinder, but the output (pushing force) of the piston rod is smaller than that of the moving cylinder. A moving table in a press machine, etc., characterized in that a positioning cylinder is connected to the positioning cylinder which has a larger output (pushing force) than that of the piston rod, and the piston rod penetrates the head cover of the moving cylinder and hits the piston head of the moving cylinder. Positioning Device 4 The positioning device for a moving table in a press or the like according to claim 3, wherein the moving cylinder and the positioning cylinder are each hydraulic cylinders.