JPH07155995A - Press - Google Patents

Abstract

PURPOSE:To provide a press capable of feeding the working fluid to a movable hydraulic cylinder without using a rubber hose. CONSTITUTION:Joint means 37-40 which can connect the flow passage on a press frame side to the flow passage on an upper punch driving unit side while the relative movement between the press frame 8 and the upper punch driving unit 6 is permitted are provided between the press frame 8 on the stationary side and the upper punch driving unit 6 on the movable side. This constitution simplifies the whole press.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press such as a powder molding press, and more particularly to a technique for supplying a working fluid to a movable fluid pressure actuator.

[0002]

2. Description of the Related Art When a large number of punches are required as the upper punches, as in a conventional powder molding press, a plurality of fluid pressure cylinders are provided to operate each punch before the upper ram 100, as shown in FIG. It is necessary to attach 103 and 104.

That is, the conventional press has a stationary press frame 105 and a movable frame 106 which is reciprocally driven by the upper ram 100 with respect to the press frame 105. The movable frame 106 is used for driving the punch. The fluid pressure cylinders 103 and 104 are provided so that a plurality of punches can be driven independently.

The movable fluid pressure cylinders 103, 104
As a method of supplying the working fluid to the pipe, it has been customary to use flexible rubber hoses 107 and 108 in the piping system.

[0005]

However, in the case of the above-mentioned prior art, when the capacity and speed of the press are greatly increased, the flow rate of the working fluid is increased, and the momentum rubber hoses 107 and 108 are also thickened. . As a result, there is a problem in that the bending radii R of the rubber hoses 107 and 108 also increase and the press width L also increases.

Further, by using the rubber hoses 107 and 108, the rubber hoses 107 and 108 can be changed by changing the pressure.
Expansion and contraction occurs, and the change in volume reduces the rigidity of the press itself.

Further, when pressure is applied to the rubber hoses 107 and 108, the rubber hoses 107 and 108 become harder, and as the rubber hoses 107 and 108 become thicker, a lateral load is generated on the press frame 105, which affects the accuracy of the molded product. In order to counter this lateral load, a strong guide is required separately.

Furthermore, a thick and highly pressure-resistant rubber hose 1
There is also a problem that the cost is increased because the makers of 07 and 108 are difficult to make.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and its purpose is to:
An object of the present invention is to provide a press capable of supplying a working fluid to a movable fluid pressure cylinder without using a rubber hose.

[0010]

In order to achieve the above object, in the present invention, a stationary structure portion, a fluid pressure cylinder for moving a punch, which is provided movably with respect to the stationary structure portion, etc. In a press comprising: a movable structure part having a fluid pressure actuator, and a flow path for a working fluid of the fluid pressure actuator, which is provided so as to pass from the stationary structure part side to the movable structure part side. Between the structure part and the movable structure part, there is provided a coupling means for allowing the relative movement of the movable structure part and the stationary structure part while connecting the flow path on the stationary structure part side and the flow path on the movable structure part side. It is characterized by that.

The joint means is a first structure provided on the stationary structure.
Of the joint component member and the first structure provided on the movable structure section.
A second joint constituent member that is relatively movable with respect to the joint constituent member of (1) along the movement direction of the movable structure section;
And a closed fluid chamber in which a flow path on the stationary structure side and a flow path on the movable structure side communicate with each other between the first joint constituent member and the second joint constituent member. And

It is characterized in that the joint means also serves as a guide for the movable structure with respect to the stationary structure.

According to the present invention, when the fluid pressure actuator is operated, the working fluid flows through the joint means between the flow passage of the stationary side structure portion and the flow passage of the movable side structure portion. And
The movement of the movable structure is allowed by the joint means, and the conventional rubber hose is unnecessary.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to illustrated embodiments.

1 and 2 show a powder molding press according to an embodiment of the present invention. This powder molding press includes a die 2 having a die hole 1, an upper punch unit 3 press-fitted into the upper and lower openings of the die hole 1, and a lower punch unit 4.
An upper punch drive unit 6 connected to the upper ram 5 of the press, and an upper punch unit 3 connected to the upper punch drive unit 6.
And a clamper unit 7 for connecting to each other. Of these, the upper punch drive unit 6, the clamper unit 7, and the upper punch unit 3 are movable structures, and can be reciprocally moved linearly with respect to a press frame 8 as a stationary structure that constitutes the press body by the upper ram 5. Has become.

In the illustrated example, the upper punch unit 3 has three punches. That is, the upper punch unit 3 has a configuration in which the upper first, upper second and upper third punches 9, 10 and 11 are concentrically and relatively movable in order from the outside.

The upper ram 5 is a thick columnar member capable of withstanding a pressing load, the upper end of which is reciprocally inserted into the upper ram main cylinder 12 and the lower end of which is connected to the upper punch drive unit 6. ing. The upper ram main cylinder 12 is fixed to an upper plate 13 forming a part of the press frame 8. In this sense, the upper ram 5 is also a part of the movable structure section.

The upper punch driving unit 6 has a cylindrical upper first punch driving cylinder 14 for driving the upper first punch 9, and an upper second punch 9 arranged inside the upper first punch driving cylinder 14. And an upper second punch drive cylinder 15 for driving the upper ram 5 and a connecting plate 16 to which the upper first and second punch drive cylinders 14 and 15 are fixed and which is connected to the lower end of the upper ram 5.

The upper first punch drive cylinder 6 includes an annular first fixed cylinder portion 17 and the first fixed cylinder portion 17.
It is composed of a cylindrical first movable cylinder portion 18 that is slidably inserted in the inner periphery in the axial direction. An inner opening first annular recess 19 into which a working fluid is to be introduced is formed on the inner circumference of the first fixed cylinder portion 17. On the other hand, on the outer peripheral surface of the first movable cylinder portion 18 facing the first annular recess 19,
A first annular piston portion 20 for pressure reception, which is slidably inserted into the inner periphery of the first annular concave portion 19, is provided, and a first annular portion is provided between the inner periphery of the first fixed cylinder portion 17 and the outer periphery of the first movable cylinder portion 18. A first upper chamber 21 and a first lower chamber 22 into which a working fluid is introduced are formed across the piston portion 20.

The first punch driving cylinder 14 has a first
The upper end of the fixed cylinder portion 17 is separated from the connecting plate 16 by a predetermined distance, and is fixed to the connecting plate 16 via a plurality of connecting rods 23. On the other hand, the upper end of the first movable cylinder portion 18 protrudes upward from the first fixed cylinder portion 17, the first guide plate 24 is provided at this protruding end portion, and the first guide plate 24 is provided with a first guide plate 24. The connecting rod 23 is slidably inserted into the first guide hole 25, and guides the reciprocating linear motion while preventing the first movable cylinder portion 18 from rotating.

The upper second punch driving cylinder 15 is slidable around the solid second fixed core portion 26, which is arranged at the center and whose upper end is directly fixed to the connecting plate 16, and the outer periphery of the second fixed core portion 26. And a second movable cylinder portion 27 to be inserted. A gap is provided between the outer circumference of the second movable cylinder portion 27 and the inner circumference of the first movable cylinder portion 18 to the extent that they do not interfere with each other. A second annular recess 28 is formed on the outer periphery of the second fixed core portion 26 so as to open the working fluid therein.

On the other hand, the second surface facing the second annular recess 28
On the inner peripheral surface of the movable cylinder portion 27, an inward second annular piston portion 29 for pressure reception that is slidably inserted into the inner periphery of the second annular recess portion 28 is provided, and the outer periphery of the second fixed core portion 26 and the second fixed core portion 26 are provided. The second upper chamber 30 and the second lower chamber 3 into which the working fluid is introduced with the second annular piston portion 29 provided between the inner periphery of the movable cylinder portion 27.
1 is formed.

The upper end of the second movable cylinder portion 27 projects above the first movable cylinder portion 18, and a second guide plate 32 is provided at the projecting end. The connecting rod 23 is slidably inserted into the second guide hole 33 formed in the second guide plate 32, and guides the reciprocating linear motion while preventing the second movable cylinder portion 27 from rotating.

Further, the outer periphery of the first fixed cylinder portion 17 located at the outermost periphery of the upper first punch drive cylinder 14 has the first
Thick first and second brackets 34, 35 projecting outward from the outer periphery of the fixed cylinder portion 17 project. Of these, the second bracket 35 is provided with an extension portion 36 extending upward, and the tip end of the extension portion 36 is connected to the connecting plate 1.
It is connected to 6.

Then, the press frame 8 as the stationary structure part and the upper punch drive unit 6 as the movable structure part.
Between the upper punch drive unit 6 and the press frame 8 while allowing the relative movement of the upper punch drive unit 6 and the press frame 8 to be connected to each other. Fourth joints 37 to 40 are provided. The first and second joints 37 and 38 connect the working fluid flow paths of the upper first punch drive cylinder 14, and the third and fourth joints 39 and 40 are the upper second punch drive cylinder 1
5 for connecting the working fluid flow path.

The first, second, third and fourth joints 37, 38,
Reference numerals 39, 40 denote joint shafts 371, 381, 39 as first joint constituent members fixed to the left and right first and second brackets 34, 35 of the movable upper punch drive unit 6.
1, 401 and joint cylinders 372, 382, 39 as second joint constituent members fixed to the press frame 8 and through which joint shafts 371, 381, 391, 401 are inserted.
2, 402 and the like. This joint cylinder 37
Guide bushes 373, 383, 39 slidably contact the outer circumferences of the joint shafts 371, 381, 391, 401 at the inner circumferences of the openings at the upper and lower ends of 2, 382, 392, 402.
3,403 are fitted and the joint shafts 371,381,
391, 401 outer circumference and first joint cylinder 372, 38
2, 392 and 402 are supported so as to be linearly movable while maintaining a predetermined gap between them.

On the other hand, the joint shafts 371, 381, 39
1,401 and joint cylinders 372,382,392,4
The gap between the 02 inner circumferences is sealed by seal portions 374, 384, 394, 404 provided at positions separated by a predetermined distance in the axial direction and appropriately sealed by packing to form fluid chambers 375, 385, 395, 405. Has been done. The seal portions 374, 384, 394, 404 are the first joint cylinders 372, 382, 392 in this embodiment.
An inwardly projecting annular protrusion is provided on the inner periphery of the 402, and the annular protrusion and the joint cylinders 372, 382, 392, 402 are provided.
A packing is properly attached between the sliding surfaces of and.

Joint cylinders 372, 382, 392, 4
02 has internal fluid chambers 375, 385, 395, 40.
5 fixed ports 377, 387, 397, 40
7 is provided. These fixed ports 377, 387,
397 and 407 are connected to a pressure supply source such as a pump (not shown) or a discharge tank such as an oil tank.

Joint shafts 371, 381, 391, 4
01 inside the shaft flow path 378, 388, 398,
408 is formed. This shaft flow path 378,
388, 398, 408 are joint shafts 371, 38
1,391,401 extends from the fixed end to a middle portion and opens to the fluid chambers 375, 385, 395, 405.

The first and second joints 37 and 38 are provided on the upper and lower ends of the first bracket 34, respectively.
9 and 40 are symmetrically arranged on the upper and lower ends of the second bracket 35, respectively.

Then, the upper first and third joints 37, 39
The fixed ports 377 and 397 are used as supply ports, and the fixed ports of the lower second and fourth joints 38 and 40 are used as discharge ports.

The joint shafts 371-401 of the above-mentioned first to fourth joints 37-40 penetrate the joint cylinders 372-402 because the fluid chambers 375-4 when they move relative to each other.
This is to prevent the volume change of 05 from occurring and to prevent a force from being applied in the axial direction (when moving up and down). However, the pressure may be varied within the range of influence.

Further, in order to obtain the accuracy of the upper ram 5, these first to fourth joints 37 to 40 are connected to the upper punch drive unit 6.
It is also possible to make it function as a guide to guide.
Of course, a guide may be provided separately from the first to fourth joints 37 to 40.

In this case, when the number of fluid pressure cylinders for driving the upper punch is one, two are required if they also serve as guides.
If it doesn't combine, one is enough. If there are a plurality of fluid pressure cylinders, a plurality of fluid pressure cylinders are required.

On the other hand, on the side end surface of the first bracket 34, a first control such as a solenoid valve for switching the supply and discharge of the working fluid to the first upper chamber 21 and the first lower chamber 22 of the upper first punch driving cylinder 14 is performed. A valve 41 is attached. Further, a second control valve 42 for switching the supply and the discharge of the working fluid to the second upper chamber 30 and the second lower chamber 31 of the upper second punch drive cylinder 15 is attached to the side end surface of the second bracket 35. .

As the first and second control valves 41, 42, various valves such as a servo valve, a proportional valve, a digital valve, etc. can be applied in addition to the solenoid valve.

In particular, it is particularly effective to arrange the servo valve near such an upper punch driving cylinder for the control of the servo valve requiring the positioning accuracy. Then, the control circuit for the working fluid to the upper first punch driving cylinder 14 is provided. As a configuration, a flow path for a working fluid such as pressure oil is appropriately provided. In this embodiment, no pipe such as a rubber hose is provided on the side of the upper punch drive unit 6 that constitutes the movable structure, and all the channels are provided inside the structural member.

The control circuit configuration of the upper first punch drive cylinder 14 will be described. The first control valve 41 includes a supply port 411 for supplying pressure fluid and a discharge port 4 for discharging.
12 and four first and second control ports 413 and 414, and the supply port 411 and the discharge port 412, and the first and second control ports 413 and 41.
The communication state between the four is appropriately changed.

Inside the first bracket 34, the first control port 413 is connected to the first upper chamber 21 of the upper punch drive cylinder 14, and the first control channel 415, the second control port 414 and the first control channel 414 are connected to each other. The second control flow path 416 connecting the lower chambers 22, the supply flow path 417 connecting the supply port 411 and the shaft flow path 378 of the first joint 37, and the discharge port 4
A discharge flow path 418 is provided that connects 12 and the upper end opening of the shaft flow path 388 of the second joint 38.

On the other hand, the control circuit configuration of the upper second punch drive cylinder 15 will be described.
Similar to the first control valve 41, the supply port 421, the discharge port 422, and the first and second control ports 423, 424 4
A port having a configuration including a supply port 421, a discharge port 422, and the first and second control ports 423 and 424.
The communication state between them is appropriately switched.

Inside the second bracket 35, the first control flow path 425 connecting the first control port 423 and the second upper chamber 30 of the upper second punch drive cylinder 15 and the second control port 424 and the second control port 424 are connected to each other. The second control channel 426 that connects the two lower chambers 31, the supply channel 427 that connects the supply port 421 and the shaft channel 398 of the third joint 39, and the discharge port 422 and the shaft channel 408 of the fourth joint 40. A discharge flow path 428 that connects the two is provided. Since the upper second punch drive cylinder 15 is located inside the upper first punch drive cylinder 14, in this embodiment, the first and second control flow passages 425 and 426 are extended from the second bracket 35 to the extension portion 3.
6, the upper first punch drive cylinder 14 is bypassed through the inside of the connecting plate 16 and the second fixed core portion 26.

The clamper unit 7 includes the upper first, second and third punches 9, 10, 11 and the upper end portion, the first movable cylinder portion 18 of the upper first punch drive cylinder 14 and the upper second punch drive cylinder 15. A plurality of annular first, second and third clampers 7 interposed between the second movable cylinder portion 27 and the second fixed core portion 26 of the upper second punch drive cylinder 15.
1, 72 and 73, and each clamper 71, 7
2, 73 are combined concentrically with each other in a fixed rotational direction and in a relatively movable axial direction.

Upper first, second and third punches 9, 10, 1
The connection end portions of the first and first, second and third clampers 71, 72 and 73 are configured to be engaged and disengaged by relative rotation, and the upper first, second and third punches respectively. 9,
Connect 10 and 11 together to the upper punch drive unit 6,
It is possible to leave.

In the press having the above construction, the upper punch unit 3 is driven up and down by the upper ram main cylinder 12 as a whole, and the upper first and second punches 9 and 10 are driven by the upper first and second punches overlapping with this movement. Cylinders 14 and 15
Independently driven by.

The drive control of the upper first punch 9 will be described. When lowering the upper first punch 9, the first control port 413 and the supply port 411 of the first control valve 41 are connected and the second control is performed. Port 414 and discharge port 412
To communicate. Then, the working fluid such as pressure oil supplied from the fixed port 377 of the first joint 37 flows from the fluid chamber 375 in the first joint 37 to the shaft passage 37 in the joint shaft 371.
8 through the first control valve 41 and the first control flow path 415
Enters into the first upper chamber 21.

Further, the working fluid in the first lower chamber 22 passes through the second control flow path 416 and the discharge port 41 of the first control valve 41.
2 enters the discharge passage 418, and is discharged from the fixed port 367 through the shaft passage 388 in the joint shaft 381 of the second joint 38 and the fluid chamber 385 of the second joint 38.

On the other hand, when raising the upper first punch 9, the second control port 414 of the first control valve 41 and the supply port 411 are communicated with each other, and the first control port 413 and the discharge port 412 are communicated with each other. Then, the working fluid supplied from the fixed port 377 of the first joint 37 flows into the first lower chamber 22 through the second control flow passage 416 by the first control valve 41, while the working fluid in the upper first chamber 21. Is the first control channel 4
15 through the first control port 413 of the first control valve 41 through the discharge port 412 to the fixed port 387 of the second joint 38.
Will be leaked from.

Here, the supply and discharge of the working fluid are performed by the fixed ports 377 and 387 of either of the first and second joints 37 and 38.
Which of the two is performed can be appropriately selected. Contrary to the above configuration, the working fluid can be supplied from the second joint 38 side and the working fluid can be discharged from the first joint 37 side.

Next, drive control of the upper second punch 10 will be described. When lowering the upper second punch 10, the first control port 423 of the second control valve 42 and the supply port 421 are communicated with each other, and The second control port 424 and the discharge port 422 communicate with each other. Then, the working fluid such as pressure oil supplied from the fixed port 397 of the third joint 39 is supplied to the third joint 3
9 from the fluid chamber 395 in the joint shaft 391 to the first control passage 425 through the shaft passage 398 in the joint shaft 391 to reach the first control passage 425.
It flows into the upper chamber 30.

Further, the working fluid in the second lower chamber 31 passes through the second control passage 426 and the discharge port 42 of the second control valve 42.
2 enters the discharge passage 428 and is discharged from the fixed port 407 through the shaft passage 408 in the joint shaft 401 of the fourth joint 40 and the fluid chamber 405 of the fourth joint 40.

On the other hand, when raising the upper second punch 10, the second control port 424 of the second control valve 42 and the supply port 421 are communicated with each other, and the first control port 423 and the discharge port 422 are communicated with each other. Then, the working fluid supplied from the fixed port 397 of the third joint 39 flows into the second lower chamber 31 through the second control flow passage 426 by the second control valve 42, while the working fluid in the second upper chamber 30 is reached. Is the first control channel 4
25 through the first control port 423 of the second control valve 42 through the discharge port 422 of the fourth joint 40.
It will flow out from 2.

Of course, the third and fourth joints 39, 40
The supply and discharge of the working fluid to and from the chamber can be reversed.

In the above embodiment, the first and second control valves 4
First and second movable upper punch drive unit 6
Although attached to the brackets 34 and 35, as shown in FIG. 3, the first and second control valves 41 'and 42' are not stationary parts, that is, the stationary side, that is, the press frame 8 or the floor surface on which the press frame 8 is installed. May be attached to.

FIG. 4 shows an example in which the first and second joints 37 and 38 or the third and fourth joints 39 and 40 are combined into one.

That is, two fluid chambers 45 and 46 are formed between the joint shaft 43 and the joint cylinder 44, and the joint cylinder 44 is provided with fixed ports communicating with the respective fluid chambers 45 and 46. On the other hand, the joint shaft 43 is provided with two shaft flow paths 47, 48 communicating with the respective fluid chambers 45, 46.

FIG. 5 illustrates a further modified example of the joint means.

FIG. 5A shows a fluid chamber 53 formed between a movable joint shaft 51 and a fixed joint cylinder 52.
Is formed on the side of the movable joint cylinder 52, and the fixed port 54 communicating with the fluid chamber 53 is connected to the joint cylinder 52.
And a passage 55 communicating with the fluid chamber 53 is formed in the joint shaft 51.

FIG. 5 (b) shows that the joint cylinder 56 is used as the movable joint component and the joint shaft 57 is used as the fixed joint component. A fluid chamber 58 is formed between the joint shaft 57 and the joint cylinder 56,
A fixed port 59 communicating with the fluid chamber is provided on the joint shaft 57, and a flow path 61 communicating with the fluid chamber 58 is formed on the side wall of the joint cylinder 56.

The structure of the joint means is not limited to the above-mentioned embodiment, but in short, the relative movement of the movable structure part and the stationary structure part is made between the stationary structure part such as the press shaft and the movable structure part such as the upper punch drive unit. Any structure may be used as long as the flow path on the stationary structure side and the flow path on the movable structure side can be connected while allowing the flow.

As the working fluid of the press, not only hydraulic pressure and hydraulic pressure but also pneumatic pressure can be applied. Further, in the above-mentioned embodiment, the case of using for a powder molding press has been described as an example, but it is not limited to the powder molding press, but can be widely applied to a press having a fluid pressure actuator such as a cylinder for punch driving in a movable structure portion. You can

[0060]

The present invention has the above-described structure and operation, and allows the relative movement of the movable structure portion and the stationary structure portion between the stationary structure portion and the movable structure portion while allowing the relative movement of the stationary structure portion. Since the joint means for connecting the flow passage and the flow passage on the movable structure side is provided, a rubber hose that extends between the stationary structure portion and the movable structure portion unlike the conventional case is not required, and the device configuration can be simplified. You can

Further, it is possible to improve accuracy because an unreasonable lateral load is not applied to the stationary structure portion.

Further, by also serving as a guide for the movable structure, the accuracy can be further improved and the appearance becomes smarter.

[Brief description of drawings]

FIG. 1 is a front sectional view of an essential part of a powder molding press according to an embodiment of the present invention.

FIG. 2 is a front cross-sectional view of an essential part in a state where the upper punch unit of FIG. 1 is removed.

FIG. 3 is a front sectional view of an essential part showing a state where the control valve position of the press of FIG. 2 is changed.

FIG. 4 is a cross-sectional view showing a modified example of the joint.

FIG. 5 is a sectional view showing still another modified example of the joint.

FIG. 6 is a schematic sectional view of a main part of a conventional fluid pressure press.

[Explanation of symbols]

 2 Die 3 Upper punch unit 5 Upper ram 6 Upper punch drive unit 7 Clamper unit 8 Press frame (stationary structure part) 9-11 Upper first to third punch 12 Upper ram main cylinder 13 Upper plate 14, 15 Upper first 1, 2nd punch drive cylinder 21,22 1st upper chamber, lower chamber 30,31 2nd upper chamber, lower chamber 34,35 1st, 2nd bracket 36 extension part 37-40 1st-4th joint (joint means) 371-401 Joint shaft 372-402 Joint cylinder 375-405 Fluid chamber 377-407 Fixed port 41,42 1st, 2nd control valve

Claims (3)

[Claims] 1. A stationary structure part, a movable structure part provided movably with respect to the stationary structure part and provided with a fluid pressure actuator for driving a punch, and passing from the stationary structure part side to the movable structure part side. A flow path for working fluid of the fluid pressure actuator, which is provided in this manner, allows relative movement of the movable structure part and the stationary structure part between the stationary structure part and the movable structure part. At the same time, a press is provided with joint means for connecting the flow path on the stationary structure side and the flow path on the movable structure side. 2. The joint means comprises a first joint constituent member provided in the stationary structure portion, and a first joint constituent member provided in the movable structure portion, the relative relative to the first joint constituent member in a moving direction of the movable structure portion. A second joint constituent member that is movably assembled, and a flow path on the stationary structure side and a flow path on the movable structure side are respectively provided between the first joint constituent member and the second joint constituent member. A press characterized in that a closed fluid chamber that communicates is formed. 3. The press according to claim 1, wherein the joint means also serves as a guide for the movable structure with respect to the stationary structure.