JP4492904B2 - Slide balance device for press machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a slide balance device for a press machine. The slide balance device is a device that suspends a slide of a press machine.
[0002]
[Prior art]
The slide balance device is attached to almost all press machines. The slide balance device pulls up or pushes the slide upward to give suspension force to the slide to prevent vibration and noise due to the clearance of the crankshaft, connecting rod, and other parts that are used to raise and lower the slide. . Furthermore, 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]
As the slide balance device, many are 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 variation in suspension force is undesirable 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 for the purpose of reducing the pressure change. The charge tank is large and it is not easy to secure the installation space.
[0004]
On the other hand, in the case of a coil spring, a spring having a small spring constant is used. However, if the stroke length of the slide becomes long, the coil spring becomes long accordingly, and eventually becomes a large coil spring.
[0005]
[Problems to be solved by the invention]
An object of the present invention is to provide a slide balance device in which variation in suspension force is small.
[0006]
[Means for Solving the Problems]
In the slide balance device of the present invention, 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 relates to a slide suspension of a slide balance device that increases as the slide descends in a slide balance device that suspends a slide of a press machine by an urging force of an air cylinder fixed to a frame or a spring. By adding the force and the suspension force of the slide due to the magnetic force that decreases as the slide descends, the change in the suspension force caused by the slide descending is compared to the change in the suspension force associated with the slide descending of the slide balance device. It was set as the structure made small.
[0007]
In addition to the structure of Claim 1, the invention of Claim 2 uses the air balance for the slide balance device.
The member that generates the magnetic force is provided so as to face the lower surface of the ceiling plate of the air cylinder and the upper surface of the piston incorporated in the air cylinder so as to receive forces in a direction that attracts each other.
[0008]
According to a third aspect of the present invention, in addition to the configuration of the first aspect, a mechanism is provided that makes the change in the distance between the members that generate the magnetic force smaller than the lift of the slide of the press machine.
[0009]
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-like link mechanism.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment will be described with reference to FIGS. 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 movable up and down facing the bolster 3. The slide 2 is guided in a vertical direction 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.
[0011]
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 are shown in FIG.
[0012]
In FIG. 2, a piston 9 is fitted to the air cylinder 8 so as to be movable up and down. An upper end portion of the rod 7 is connected to the piston 9, and a lower end portion 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. The magnet 10 and the magnetic body 11 are subjected to forces that are attracted to each other.
[0013]
The air cylinder 8 is provided with an air inlet 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 freely enters and exits. These members such as the air cylinder 8 and the piston 9 constitute a slide balance device.
[0014]
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 air inlet 12 is adjusted according to the weight of the upper mold attached to the lower surface of the slide 2.
[0015]
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 interchanged.
[0016]
The suspension force of the slide balance device will be described with reference to FIG. In the figure, the suspension force of the air cylinder is a suspension force caused by the absence of the magnet 10 and the magnetic body 11, that is, the suspension force of air, and increases almost linearly as the slide 2 descends.
[0017]
In the drawing, the suspension force of the magnet is a pulling force of the magnet 10 and the magnetic body 11 and decreases as the slide 2 descends. That is, the attractive force of both is almost inversely proportional to the square of the distance.
[0018]
The total suspension force is the sum of both suspension forces described above, and is a combination of both. This total suspension force change is much smaller than the air cylinder suspension force change.
[0019]
A second embodiment will be described with reference to FIGS. A bolster 15 is fixed to the frame 14 of the press machine, and a slide 16 is provided so as to be movable up and down so as to face the bolster 15.
[0020]
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, and the slide 16 is moved up and down by this linear motor. .
[0021]
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 brackets. The spring 19 biases the slide 16 upward. That is, the spring 19 applies a suspension force to the slide 16.
[0022]
A magnetic body 21 is fixed to the frame 14, and a magnet 22 is provided so as to be able to advance and retract so as to face the magnetic body 21. The magnet 22 can be moved forward and backward by four links 29, 30, 31, and 32.
[0023]
The four links are arranged in a diamond shape and assembled in a pantograph shape. One ends of the upper two links 29 and 30 are connected by a fulcrum pin 25 erected on the frame 14. One ends of the lower two links 31 and 32 are connected by a fulcrum pin 26 erected on the slide 16.
[0024]
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 symmetrical with respect to the center of the press machine. As the slide 16 moves up and down, the pantograph-shaped link opens and closes, and as a result, the magnet 22 moves forward and backward with respect to the magnetic body 21.
[0025]
The magnet 22 and the magnetic body 21 are in a mutually attractive relationship. As the slide 16 descends, the suspension force by the spring 19 increases and the suspension force by the magnet 22 and the magnetic body 21 decreases. The combination of the suspension forces of both is the same as the relationship shown in FIG.
[0026]
In the case of the second embodiment, since the moving amount of the magnet is small with respect to the moving amount of the slide 16, the force by the magnet can be used over the entire stroke of the slide 16.
[0027]
Also in the case of the second embodiment, the type and arrangement of the magnets are the same as in the first embodiment.
[0028]
【The invention's effect】
According to the first and second aspects of the present invention, since the suspension force is applied by the magnetic force and the suspension force is supplemented, the variation in the suspension force can be reduced without providing a large-capacity charge tank. In the third and fourth aspects of the invention, since the amount of movement of the member that generates the magnetic force is small with respect to the amount of elevation of the slide, the magnetic force can be used effectively.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional front view of a first embodiment. FIG. 2 is an enlarged view of an air cylinder portion in FIG. 1. FIG. 3 is an explanatory diagram of suspension force. FIG. 5 is a side view of the second embodiment.
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 body, 12 Is an air 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 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)

The press machine slide, the slide balance device for suspending by the biasing force of the air cylinder or spring, which is fixed to the frame, a slide suspension force of the slide balance device increases with the downward movement of the slide, the lowering of the slide By summing up the suspension force of the slide due to the magnetic force that decreases along with that, the change in the suspension force accompanying the slide descent is made smaller than the change in the suspension force accompanying the slide descent of the slide balance device. Features a slide balance device for press machines. The slide balance device and which utilizes an air cylinder, counter to receive a force in a direction attract each other a member for generating a magnetic force to the upper surface of the piston incorporated in the lower surface and the air cylinder of the ceiling plate of the air cylinder The slide balance device for a press machine according to claim 1, wherein the slide balance device is provided. 2. The slide balance device for a press machine according to claim 1, further comprising a mechanism for making a change in the distance between the members that generate the magnetic force smaller than a lift amount of the slide of the press machine. 4. The slide balance device for a press machine according to claim 3, wherein the slide balance device uses a spring, and the mechanism is a pantograph-like link mechanism.

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