JP2002137098A - Slide balance device od press machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slide balance device small in the fluctuation of suspension force. SOLUTION: The slide balance device is made a structure combining a magnet and an air cylinder or combining the magnet and a spring.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slide balance device for a press machine. A slide balance device is a device for suspending a slide of a press machine.

[0002]

2. Description of the Related Art A slide balance device is attached to almost all press machines. The slide balance device pulls up or pushes up the slide to give a suspension force to the slide, and prevents vibration and noise due to clearances of a connecting portion such as a crankshaft and a connecting rod, which are members for raising and lowering the slide, and a bearing portion. . Further, the slide balance device can reduce the driving torque of the motor that is the power source of the press machine in the process of raising the slide.

[0003] The slide balance device is mostly constituted by an air cylinder, but in the case of a small size, a spring (mainly a coil spring) may be used. When the slide moves up and down, the pressure in the air cylinder changes, and the suspension force fluctuates. This fluctuation of the suspension force is not preferable for smooth operation of the press machine. Therefore, conventionally, in the case of an air cylinder, a charge tank having a volume several times that of the air cylinder is connected to the air cylinder in order to reduce the pressure change. The charge tank is large and it is not easy to secure the installation space.

On the other hand, in the case of a coil spring, a spring having a small spring constant is used. However, as the stroke length of the slide becomes longer, the coil spring becomes longer accordingly.
The result is a large coil spring.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a slide balance device in which the fluctuation of the suspension force is small.

[0006]

The slide balance apparatus of the present invention has a structure in which a magnet and an air cylinder are combined or a magnet and a spring are combined. More specifically, the invention of claim 1 is configured such that in the slide balance device of the press machine, a member for generating a magnetic force is used, and the suspension force of the slide of the press machine is supplemented by the magnetic force.

According to a second aspect of the present invention, in addition to the first aspect, the slide balance device uses an air cylinder, and the member for generating the magnetic force is incorporated in the air cylinder and the air cylinder. The pistons were provided facing each other.

According to a third aspect of the present invention, in addition to the configuration of the first aspect, a mechanism is provided for reducing a change in the distance between the members for generating the magnetic force to be smaller than a vertical movement of a slide of the press machine.

According to a fourth aspect of the present invention, in addition to the configuration of the third aspect, the slide balance device uses a spring, and the mechanism is a pantograph link mechanism.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment will be described with reference to FIGS. 1, 2 and 3. FIG. In FIG. 1, a bolster 3 is fixed to a frame 1 of a press machine, and a slide 2 is provided so as to be able to move up and down in opposition to the bolster 3. Slide 2
It is guided vertically by a slide guide 6 and is moved up and down by a crank mechanism including a crankshaft 4, a connecting rod 5, and the like.

An air cylinder 8 is fixed to the frame 1, and a suspension force is applied to the slide 2 by the air cylinder 8. The details of the air cylinder section are shown in FIG.

In FIG. 2, a piston 9 is fitted to the air cylinder 8 so as to be able to move up and down.
And the lower end of the rod 7 is connected to the slide 2. A magnet 10 is fixed to the lower surface of the ceiling plate of the air cylinder 8, and a magnetic body 11 is fixed to the upper surface of the piston 9 so as to face the magnet 10. Magnet 10 and magnetic body 11
Receive the forces of attracting each other.

The air cylinder 8 is provided with an intake port 12, to which an air pipe is connected. On the other hand, the air cylinder 8 is provided with an opening 13 through which air above the piston 9 can freely flow. The members such as the air cylinder 8 and the piston 9 constitute a slide balance device.

The air supplied to the air inlet 12 urges the piston 9, and the slide balance device suspends the slide 2. The pressure of the air supplied to the intake port 12 is adjusted according to the weight of the upper die attached to the lower surface of the slide 2.

In the structure of the slide balance device, the magnet 10 may be an electromagnet and the magnetic body 11 may be an electromagnet. Further, the magnet 10 and the magnetic body 11 may be exchanged.

The suspension force of the above-described slide balance device will be described with reference to FIG. In the figure, the suspension force of the air cylinder is the suspension force due to the absence of the magnet 10 and the magnetic body 11, that is, the suspension force due to air, and increases almost linearly as the slide 2 descends.

In the figure, the suspension force of the magnet is the attraction between the magnet 10 and the magnetic body 11, and decreases as the slide 2 descends. That is, the attractive force between the two is approximately inversely proportional to the square of the distance.

The total suspension force is the sum of both suspension forces described above, and is a composite of both. The change in the total suspension force is much smaller than the change in the suspension force of the air cylinder.

A second embodiment will be described with reference to FIGS. A bolster 15 is fixed to a frame 14 of the press machine, and a slide 16 is provided so as to be able to move up and down opposite to the bolster 15.

A linear guide 18 is provided on the frame 14, and a linear motor plate 17 is provided on the slide 16 so as to face the linear guide 18. A linear motor is constituted by the linear guide 18 and the linear motor plate 17. Goes up and down.

A bracket 23 is fixed to the frame 14, a bracket 24 is fixed to the slide 16, and a spring 19 is incorporated between the two brackets. Spring 19
Urges the slide 16 upward. That is, the spring 1
9 applies a suspension force to the slide 16.

A magnetic body 21 is fixed to the frame 14, and a magnet 22 is provided opposite to the magnetic body 21 so as to be movable forward and backward. The magnet 22 has four links 29, 30, 31, 32
It is possible to move forward and backward.

The four links are arranged in a diamond shape and are arranged in a pantograph shape. Upper two links 29, 3
0 is connected to a fulcrum pin 25 erected on the frame 14 at one end. One ends of the lower two links 31 and 32 are connected by a fulcrum pin 26 erected on the slide 16.

The other ends of the upper link 29 and the lower link 31 are connected by a fulcrum pin 27 erected on the magnet 22. The other ends of the upper link 30 and the lower link 32 are connected by a fulcrum pin 28 erected on the magnet 22. The arrangement of the link, the magnetic body 21 and the magnet 22 is symmetric with respect to the center of the press machine. As the slide 16 moves up and down, the pantograph link opens and closes,
As a result, the magnet 22 moves forward and backward with respect to the magnetic body 21.

The magnet 22 and the magnetic body 21 have a relation of attracting each other. As the slide 16 descends, the suspension force of the spring 19 increases, and the suspension force of the magnet 22 and the magnetic body 21 decreases. The combination of the two suspension forces is the same as the relationship in FIG. 3 described above.

In the case of the second embodiment, since the moving amount of the magnet is smaller than the moving amount of the slide 16, the force of the magnet can be used over the entire stroke of the slide 16.

In the case of the second embodiment, the types and arrangement of the magnets are the same as in the first embodiment.

[0028]

According to the first and second aspects of the present invention, since the suspension force is applied by the magnetic force to supplement the suspension force, the fluctuation of the suspension force can be reduced without providing a large-capacity charge tank. According to the third and fourth aspects of the present invention, the moving amount of the member that generates the magnetic force is smaller than the moving amount of the slide.

[Brief description of the drawings]

FIG. 1 is a front view of a partial cross section in a first embodiment.

FIG. 2 is an enlarged view of an air cylinder section in FIG. 1;

FIG. 3 is an explanatory view of a suspension force.

FIG. 4 is a front view of the second embodiment.

FIG. 5 is a side view of the second embodiment.

[Explanation of symbols]

1 is a frame, 2 is a slide, 3 is a bolster, 4 is a crankshaft, 5 is a connecting rod, 6 is a slide guide, 7 is a suspension rod, 8 is an air cylinder, 9 is a piston, 10 is a magnet, 11 is a magnetic material, 12 Is an inlet, 13 is an opening, 14
Is a frame, 15 is a bolster, 16 is a slide, 17 is a linear motor plate, 18 is a linear guide, 19 is a spring, 20 is a link mechanism, 21 magnetic body, 22 is a magnet, 23
Is a bracket, 24 is a bracket, 25 is a fulcrum, 26 is a fulcrum, 27 is a fulcrum, 28 is a fulcrum, 29 is a link, 30 is a link, 31 is a link, and 32 is a link.

Claims (4)

[Claims] 1. A slide balance device for a press machine, characterized in that a member for generating a magnetic force is used to replenish the suspension force of the slide of the press machine with the magnetic force. 2. The apparatus according to claim 1, wherein said slide balance device utilizes an air cylinder, and said member for generating magnetic force is provided to face said air cylinder and a piston incorporated in said air cylinder. Item 2. A slide balance device for a press machine according to item 1. 3. The slide balance device for a press machine according to claim 1, further comprising a mechanism for reducing a change in a distance between the members generating the magnetic force to be smaller than an amount of elevation of a slide of the press machine. 4. A slide balance device for a press machine according to claim 3, wherein said slide balance device uses a spring, and said mechanism is a pantograph-shaped link mechanism.