JP2008036688A - Pressing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressing machine which can balance the weight of a slide effectively with a prescribed balancing pressure by furnishing a driving means capable of adjusting the balancing pressure of a balancer, and which can be made compact. <P>SOLUTION: The invented pressing machine 100 comprises a crown 11, a main gear 12 which is mounted on the crown 11 and free to rotate, a connecting rod 14 which rotates with the rotation of the main gear 12, a slide 18 which is connected with the connecting rod 14 via a plunger 16 and moves vertically with the rotation of the connecting rod 14, and a balancer 20 which is connected with the slide 18 via a balancer bracket 50 and can balance the weight of the slide 18 when the slide 18 moves vertically. The balancer 20 is equipped with the driving means which can adjust the balancing pressure. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a press apparatus.

In a conventional press apparatus, a so-called workpiece is pressed by repeatedly moving the slide up and down.
At this time, the slide is maintained in a state of being lifted by a member connected to the slide.

5 and 6 are diagrams schematically showing members connected to the slide of the press device.
Now assume members 48a and 48b connected to the slide. There are manufacturing tolerances between the members 48a and 48b.
FIG. 5 shows that when the member 48a supports the member 48b, a clearance due to tolerance is generated below.
When an upward force is applied to the member 48b in this state, the member 48a and the member 48b collide with each other in the gap.

In order to suppress the occurrence of such an impact, the member 48b is lifted in advance and brought into contact with the member 48a.
In such a state where the weights are balanced, no gap is generated below, so that no collision occurs between the members 48a and 48b.
The force generated in the lifting is the balance force.
This balance power is secured by the function of the balancer.

As a balancer provided in a press apparatus, a method of controlling a lifting force of a balancer connected to a slide of a crank press is known (for example, see Patent Document 1).
In this method, an air cylinder type balancer (air type balancer) in which a piston is slidably inserted into a cylinder tube is used.

The frame and slide are connected via a balancer, and the air supply source and the balancer air chamber are connected via a pressure regulator and a balancer tank, so that the set pressure of the pressure regulator is adjusted by the piston in the cylinder. Thus, a press machine that obtains a balancer force, supports the weight of a slide, an upper die, etc., and smoothly moves the slide up and down is disclosed (for example, see Patent Document 2).
According to this method, it is possible to adjust the balance pressure for the slide (mold).

FIG. 7 is a front view showing a typical example of a press apparatus having a conventional so-called balancer.
A conventional press device 300 shown in FIG. 7 is an air balancer in which the balancer 40 includes a cylinder 42 and a piston 41.
The pressing device 300 includes an air tank 45 for sending air through an air pipe 46 connected to the cylinder 42.
The press device 300 includes the air tank 45 to reduce pressure fluctuation in the cylinder.
JP 07-51900 A JP-A-11-90698

However, in the conventional air balancer including the balancer described in Patent Documents 1 and 2 described above, by providing the air tank 45, the absolute volume of air is increased and the pressure fluctuation in the cylinder 42 is reduced. However, it is difficult to keep the balance pressure constant.
For this reason, in the said press apparatus 300, it is necessary to make a balance pressure more than the minimum pressure of a fluctuation | variation, and efficiency is bad.

On the other hand, in the press apparatus 300, in order to make the balance pressure constant, the air tank 45 needs to have an extremely large volume structure compared to the cylinder 42.
However, since a press apparatus including such an air tank has a large facility, installation and maintenance of the air tank 45 become difficult.
In particular, with the recent increase in size of the main body of the press apparatus, such a problem has become more serious.

  The present invention has been made in view of the above circumstances, and by providing driving means capable of creating a balancer balance pressure, the weight of the slide can be balanced efficiently with a predetermined balance pressure, and the equipment can be made compact. It is an object of the present invention to provide a pressing device that can perform the above.

The inventors of the present invention have intensively studied to solve the above problems, and found that the air balancer cannot sufficiently suppress the fluctuation of the balance pressure.
Then, in place of the air type balancer, a balancer using a ball screw or a linear motor that does not use air as a driving means is manufactured and used in a press apparatus, and it is found that the above problems can be solved, and the present invention is completed. It came.

  That is, the present invention includes (1) a crown, a main gear rotatably attached to the crown, a connecting rod that rotates based on the rotation of the main gear, and a connecting rod connected to the connecting rod via a plunger. In a press apparatus comprising: a slide that moves up and down based on the rotation of the balance; and a balancer that is connected to the slide via a balancer bracket and that can balance the weight of the slide when the slide moves up and down. Exists in a press apparatus having a driving means capable of adjusting the balance pressure.

  The present invention resides in (2) the press device according to the above (1), wherein the balance pressure during the up-and-down movement of the slide is constant.

  The present invention resides in (3) the press device according to the above (1), wherein the driving means is a linear motor.

  The present invention resides in (4) the press device according to the above (3), wherein the linear motor is a linear synchronous motor.

  The present invention resides in (5) the press device according to the above (1), wherein the driving means is a ball screw.

  The present invention resides in (6) the press device according to (5), wherein the ball screw is driven by a servo motor.

  In addition, as long as the objective of this invention is met, the structure which combined said (1)-(6) suitably is also employable.

In the press device of the present invention, since the balancer has driving means such as a linear motor and a ball screw capable of adjusting the balance pressure, fluctuations in the balance pressure of the balancer are sufficiently suppressed.
For this reason, the weight of the slide can be balanced efficiently with a predetermined balance pressure.

Moreover, the said press apparatus can reduce the quantity of consumable parts, such as a seal used for an air type balancer, and an apparatus becomes simple.
Further, since the press apparatus does not require an air supply source, it is possible to suppress an increase in equipment and to sufficiently cope with the recent increase in size of the press.

  Therefore, according to the press apparatus, by providing the driving means capable of adjusting the balance pressure of the balancer, the weight of the slide can be balanced efficiently with a predetermined balance pressure, and the equipment can be made compact. it can.

  In the press device of the present invention, when the balance pressure is constant, the impact generated when the slide reaches the top dead center or the bottom dead center is reliably suppressed.

  In the press device of the present invention, when the driving means is a linear motor, the piston moves up and down based on the lifting and lowering motion of the slide, and the lifting and lowering motion of the piston is controlled by the electromagnet. Therefore, in this case, fluctuations in the balance pressure can be reliably suppressed.

  When the linear motor is a linear synchronous motor, the press device of the present invention can more reliably suppress fluctuations in the balance pressure.

In the press device according to the present invention, when the driving means is a ball screw, the balance pressure is adjusted by rotating the ball screw and screwing it into or out of the bearing portion based on the up and down movement of the slide.
For this reason, the fluctuation | variation of balance pressure can be suppressed reliably by controlling the rotational speed of a ball screw.

  In the press device of the present invention, when the ball screw is driven by the servo motor, the rotation speed of the ball screw can be controlled with certainty, so that fluctuations in the balance pressure can be more reliably suppressed.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings as necessary.
In the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.
Further, the positional relationship such as up, down, left and right is based on the positional relationship shown in the drawings unless otherwise specified.
Further, the dimensional ratios in the drawings are not limited to the illustrated ratios.

[First Embodiment]
First, a first embodiment of the press device of the present invention will be described.
FIG. 1 is a front view showing a first embodiment of a press apparatus of the present invention.
As shown in FIG. 1, a press device 100 according to the present embodiment includes a crown 11, a main gear 12 rotatably attached to the crown 11, and a connecting rod 14 that rotates based on the rotation of the main gear 12. The slide 18 is connected to the connecting rod 14 via the plunger 16 and is moved up and down based on the rotation of the connecting rod 14, and the slide 18 is connected to the slide 18 through the balancer bracket 50 and the slide 18 is moved up and down. And a balancer 20 capable of balancing the weight of each.

The press device 100 is provided with a shaft 13 on the crown 11, and the main gear 12 is attached to be rotatable about the shaft 13.
As the main gear 12 rotates, the shaft 13 rotates.

2A is an enlarged view showing the connecting rod of the press device according to the present embodiment, and FIG. 2B is a longitudinal sectional view of the connecting rod shown in FIG.
As shown in FIGS. 2A and 2B, the connecting rod 14 includes a ring-shaped head portion 14a and a leg portion 14b that extends downward from the head portion 14a and contacts a plunger 16 described later.

The connecting rod 14 is fitted with the head 13 a on the shaft 13, and is rotated by the rotation of the shaft 13.
That is, the connecting rod 14 rotates based on the rotation of the main gear 12.
On the other hand, the leg portion 14 b of the connecting rod 14 is in contact with the plunger 16 via the connecting rod sheet 15.
The connecting rod sheet 15 is provided to buffer an impact transmitted to the leg portion 14b of the connecting rod 14 when the slide moves up and down.

When the main gear 12 rotates about the shaft 13, the connecting rod 14 moves in the direction of arrow A.
If it does so, if the connecting rod 14 rotates to the direction of arrow A, the front-end | tip of the leg part 14b will raise.
When the connecting rod 14 further rotates from this state, the tip of the leg portion 14b is lowered.
That is, the leg portion 14 b moves up and down based on the rotation of the connecting rod 14.
Accordingly, the plunger 16 that is in contact with the leg portion 14b via the connecting rod sheet 15 also moves up and down in the same manner.

Returning to FIG. 1, in the press device 100 according to this embodiment, a slide 18 is connected to the plunger 16 via a slide adjusting device 17.
An upper mold (not shown) is disposed below the slide 18.
On the other hand, a lower mold (not shown) is disposed on the bolster 19 facing the slide 18.

Then, the slide 18 is also moved up and down based on the above-described up and down movement of the plunger 16 to perform pressing.
The slide adjusting device 17 is provided to adjust the position of the slide 18 at the bottom dead center for each mold.

In the press device 100 according to the present embodiment, a balancer 20 is provided on the side surface of the slide 18 via a balancer bracket 50.
The balancer 20 has driving means that can adjust the balance pressure, and can balance the weight of the slide 18.
That is, the slide 18 is always lifted by the balancer 20.

FIG. 3A is a graph showing the relationship between the balance pressure of the balancer of the conventional press apparatus shown in FIG. 6 and the position of the slide, and FIG. 3B is the graph of the press apparatus according to the present embodiment. It is the graph which showed the relationship between the balance pressure of a balancer, and the position of a slide.
The balance pressure is a pressure necessary to balance the weight of the slide as described above.
That is, the balance pressure is determined based on the weight of the slide.

  As shown in FIG. 3A, in the conventional press apparatus 300, the difference F in the balancer pressure is large when the slide is at the top dead center and when the slide is at the bottom dead center.

That is, the balancer force is large when the slide is at the bottom dead center, and the balancer force is small when the slide is at the top dead center.
This is because the balance force is obtained by the compression ratio of air.
Since the balance pressure fluctuates as described above, it cannot be said that the weight during the up-and-down movement of the slide is sufficiently balanced.

On the other hand, as shown in FIG. 3B, the balancer 20 of the press device 100 according to the present embodiment always has a constant balance pressure when the slide 18 moves up and down.
For this reason, the impact generated when the slide reaches the top dead center or the bottom dead center is reliably suppressed.

The balancer 20 of the press device 100 according to the present embodiment includes a slider 23 supported by a support column 51 connected to a balancer bracket 50 and a cylinder 22 in which the slider 23 is inserted. And the electromagnet 21 is attached to the outer wall of the slider 23, respectively.
That is, in the press device 100 according to the present embodiment, the driving means of the balancer 20 is a linear motor.

Specifically, a linear synchronous motor is employed as the linear motor.
Therefore, in the lifting / lowering movement of the slider 23, a propulsive force due to attraction and repulsion between the magnetic poles is used.
According to this linear synchronous motor, the balance pressure can be made constant.
Further, since the linear motor has no rotating portion, it has an advantage that the driving means can be made compact.

As described above, in the press device 100 according to the present embodiment, the slider 23 moves up and down based on the lifting movement of the slide 18, and the driving force of the slider 23 is electrically controlled.
Therefore, in this case, the balance pressure can be made constant.

  Therefore, the press device 100 can efficiently balance the weight of the slide 18 with a predetermined balance pressure.

Further, since the balancer 20 uses the linear motor as the driving means, the press device 100 can reduce the amount of consumable parts such as seals used in the air balancer, and the device becomes simple.
Furthermore, since the press apparatus 100 does not require an air supply source, it is possible to suppress an increase in equipment and to sufficiently cope with the recent increase in size of the press.

  Therefore, according to the press apparatus 100, by adjusting the balance pressure of the balancer 20, the weight of the slide 18 can be balanced efficiently with a predetermined balance pressure, and the equipment can be made compact.

[Second Embodiment]
Next, a second embodiment of the press device of the present invention will be described.
FIG. 4 is a front view showing a second embodiment of the pressing device of the present invention.
As shown in FIG. 4, the press device 200 according to the present embodiment is the press device according to the first embodiment in that the balancer 20 whose driving means is a linear motor is the balancer 30 whose driving means is a ball screw. 100 is different.

The balancer 30 of the press device 200 according to the present embodiment includes a balancer shaft 34 supported by a support column 51 connected to the balancer bracket 50, a bearing portion 36 provided on the balancer shaft 34, and a bearing portion 36. A ball screw 31 that can be screwed out and screwed in.
That is, in the press apparatus 200 according to the present embodiment, the driving means of the balancer 30 is a ball screw.

The press device 200 according to the present embodiment controls the up and down movement of the ball screw 31 by rotating the ball screw 31 based on the up and down movement of the slide 18 and screwing it into or out of the bearing portion 36.
Therefore, the balance pressure can be made constant by controlling the rotational speed (rotational torque) of the ball screw 31.

The rotation of the ball screw 31 is driven by a servo motor 35.
In this case, since the rotational speed of the ball screw 31 can be reliably controlled, the balance pressure can be easily made constant.

  Therefore, the press device 200 can efficiently balance the weight of the slide 18 with a predetermined balance pressure, similarly to the press device 100 according to the first embodiment described above.

Further, since the balancer 30 uses the ball screw as the driving means, the press device 200 can reduce the amount of consumable parts such as seals used in the air balancer, and the device is simple.
Furthermore, since the press apparatus 200 does not require an air supply source, it is possible to suppress an increase in equipment and sufficiently cope with the recent increase in size of the press.

  Therefore, according to the press device 200, by adjusting the balance pressure of the balancer 30, it is possible to efficiently balance the weight of the slide 18 with a predetermined balance pressure.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment.

  For example, in the press apparatus 100.200 according to the first and second embodiments, two balancers are used, but the number of balancers may be one or two or more.

  In the press device according to the first embodiment, a linear synchronous motor is used as a linear motor, but a linear induction motor or a linear DC motor may be used.

A linear motor or a ball screw is used as the balancer driving means, but other means may be used.
For example, a hydraulic cylinder, a rack & pinion, etc. are mentioned.

  In the press devices according to the first and second embodiments, the balance pressure is determined based on the weight of the slide, but the speed of the slide 18 is detected by a detector such as an encoder, and based on the detected speed signal. The balancer pressure may be adjusted by moving the drive means.

  In the press device of the present invention, the shapes of the crown, main gear, connecting rod, plunger, etc. of the press devices 100 and 200 according to the first and second embodiments described above are not particularly limited, and the slide moves up and down. If so, any of these components may be missing.

FIG. 1 is a front view showing a first embodiment of a press apparatus of the present invention. 2A is an enlarged view showing the connecting rod of the press device according to the present embodiment, and FIG. 2B is a longitudinal sectional view of the connecting rod shown in FIG. FIG. 3A is a graph showing the relationship between the balance pressure of the balancer of the conventional press apparatus shown in FIG. 6 and the position of the slide, and FIG. 3B is the graph of the press apparatus according to the present embodiment. It is the graph which showed the relationship between the balance pressure of a balancer, and the position of a slide. FIG. 4 is a front view showing a second embodiment of the pressing device of the present invention. FIG. 5 is a diagram schematically showing members connected to the slide of the press device. FIG. 6 is a diagram schematically showing members connected to the slide of the press device. FIG. 7 is a front view showing a press apparatus having a conventional balancer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Crown 12 ... Main gear 13 ... Shaft 14 ... Connecting rod 14a ... Head 14b ... Leg 15 ... Connecting rod seat 16 ... Plunger 17 ... Slide adjustment device 18 ... Slide 19 ... Bolster 20, 30, 40 ... Balancer 21 ... Electromagnet 22 , 42 ... Cylinder 23 ... Slider 31 ... Ball screw 35 ... Servo motor 36 ... Bearing part 41 ... Piston 45 ... Air tank 46 ... Air pipe 48a, 48b ... Member 50 ... Balancer bracket 51 ... Post 100, 200, 300 ... Press device

Claims (6)

With the crown,
A main gear rotatably attached to the crown;
A connecting rod that rotates based on the rotation of the main gear;
A slide connected to the connecting rod via a plunger and moving up and down based on rotation of the connecting rod;
A balancer connected to the slide via a balancer bracket and capable of balancing the weight of the slide when the slide moves up and down;
In a press device comprising:
A press apparatus, wherein the balancer has a driving means capable of adjusting a balance pressure.   The press apparatus according to claim 1, wherein the balance pressure during the up-and-down movement of the slide is constant.   The press apparatus according to claim 1, wherein the driving means is a linear motor.   The press apparatus according to claim 3, wherein the linear motor is a linear synchronous motor.   The press apparatus according to claim 1, wherein the driving means is a ball screw. The press apparatus according to claim 5, wherein the ball screw is driven by a servo motor.

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