JP2007301612A - Die cushion device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a die cushion device with which optimum condition setting matching a forming state is made possible and the reduction of cost or the like is effectively achieved. <P>SOLUTION: A blank holder 15 is upward energized and the peripheral part of a work W is held between a blank holder 15 and the upper die 1 of a press. This device has a plurality of cushion shaft units for directly upward energizing the blank holder 15, and the cushion shaft unit is selected in accordance with the kind of the work and cushion force is made adjustable for every selected cushion shaft unit. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a die cushion device in a press used for sheet metal processing, for example.

As this type of device, a so-called NC die cushion device using both air pressure and hydraulic pressure is known as a die cushion device capable of adjusting a cushioning force required during molding.
This device obtains a cushioning force by controlling a hydraulic servo valve.
A device having a stroke adjustment function, a locking function, and an auxiliary lift function is also provided.
In this case, in particular, in the die cushion device, a cushion pad is attached on the pneumatic cylinder or the hydraulic cylinder, and the cushion force is applied to the blank holder via the cushion pin.

  As specific devices, for example, devices disclosed in Patent Document 1, Patent Document 2, or Patent Document 3 are known.

JP-A-5-7945 JP-A-6-543 Japanese Patent No. 3211904

However, the conventional apparatus particularly requires a large hydraulic control unit in addition to the stroke adjusting mechanism, and the entire apparatus is extremely complicated and the cost has to be increased.
In addition, a large number of hydraulic pipes between the devices are required, and it takes a lot of labor and man-hours for maintenance and inspection in actual use, which is difficult.

Moreover, the cushion pad used as the guide at the time of raising / lowering is one or several large box shape.
Therefore, a plurality of cushion pins are disposed on the cushion pad, and the generated cushion force is evenly transmitted to the plurality of cushion pins via the cushion pad.
Therefore, it is substantially difficult to individually control the force transmitted to the cushion pin.

  In view of such circumstances, an object of the present invention is to provide a die cushion device that enables optimal condition setting according to a molding state and effectively realizes cost reduction or the like.

  The die cushion device according to the present invention is a die cushion device in which a blank holder is biased upward to hold a work peripheral portion between the blank holder and a press upper die, and the blank holder is directly attached to the die cushion device. A plurality of cushion shaft units are provided, the cushion shaft unit is selected according to the type of workpiece, and the cushion force can be set and adjusted for each selected cushion shaft unit.

  In the die cushion device of the present invention, the blank holder is held by a cushion pin of the cushion shaft unit.

  In the die cushion device of the present invention, the blank holder is held by a cushion shaft of the cushion shaft unit.

  In the die cushion device of the present invention, a ball screw mechanism is included as an urging drive source for the cushion shaft unit.

  In the die cushion device of the present invention, a linear motor mechanism is included as an urging drive source for the cushion shaft unit.

  In the die cushion device of the present invention, a lower press die is mounted on a moving bolster via a bolster plate, and the cushion shaft unit is configured to be built in the moving bolster.

  Further, in the die cushion device of the present invention, a press lower die is mounted on the moving bolster via a bolster plate, a pin plate is mounted on the bottom of the moving bolster, and the wear plate corresponding to each cushion shaft is It is characterized by being seated on a pin plate.

  In the die cushion device of the present invention, a plurality of cushion pins are biased by a single cushion shaft unit.

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

According to the present invention, large equipment such as a cushion pad is not necessary, and it is possible to effectively realize downsizing of the apparatus.
In addition, since the cushion force can be controlled for each cushion pin on the operation of the device, optimal conditions are set for each part according to the molding state, and the degree of freedom of molding shape and freedom of material selection, Furthermore, product quality is greatly improved.

Hereinafter, preferred embodiments of a die cushion device according to the present invention will be described with reference to the drawings.
(First embodiment)
1 and 2 show a configuration example of a press device according to an embodiment of the present invention and a die cushion device incorporated therein.
First, the upper die 1 and the lower die 2 are provided, and the workpiece W is press-molded by these press dies.
The upper die 1 is supported by a slide 3 so as to be movable up and down, and the lower die 2 is placed on a bolster plate described later.

In the die cushion device 10, the lower mold 2 is supported on the bolster plate 11.
The bolster plate 11 is supported on the bed 13 via the moving bolster 12.
The bed 13 is supported on a foundation (not shown).
The cushion mount 14 is fixed to the lower side of the bed.
The blank holder 15 is disposed around the lower mold 2 and presses and holds the peripheral edge of the workpiece W between the blank holder 15 and the upper mold 1.
A pressing portion 1 a is provided on the peripheral edge of the upper mold 1 corresponding to the blank holder 15.

  In the present invention, a plurality of cushion shaft units that directly bias the blank holder 15 upward are provided, the cushion shaft unit is selected according to the type of workpiece, and the cushion force can be set and adjusted for each selected cushion shaft unit. Yes.

Specifically, a plurality of cushion pins 16 are arranged in a lattice pattern (X and Y directions) at predetermined pitch intervals on the bolster plate 11, and each cushion pin 16 is mounted so as to be movable in the vertical direction and the blank holder 15. Hold this from the bottom.
The cushion pins 16 are selectively arranged according to the type of the workpiece W, and are urged upward via the wear plate 18 by the cushion shafts 17 arranged below the individual cushion pins 16.

In this example, the urging drive source of the cushion shaft unit includes a ball screw mechanism, that is, the ball screw 21 is driven by the servo motor 20 fixed to the cushion mount 14 via the frame 19 to move the cushion shaft 17 up and down. (FIG. 1 → FIG. 2 → FIG. 1).
Each servo motor 20 is controlled by a control signal from the control device 22.
In this case, the servo motor 20 and the ball screw 21 are retracted to the cushion pins 16 that are not selected and placed in a non-use state.

Here, FIG. 3 shows a setting example of the cushion force generated by the cushion shaft unit.
As shown in FIG. 3 (a), cushion pins 16 are selected so that a cushioning force as shown in the graph is obtained for each of the pair of workpieces W1a and W1b in the X and Y directions. Control the operation.
Similarly, the cushioning force is set for the workpiece W2 as shown in FIG.
The cushioning force can be changed during the work.
In that case, the servo motor 20 and the ball screw 21 exert a quick movement.

Depending on the type of workpiece W, for example, as shown in FIG. 4, a set of upper mold 1A and lower mold 2A, upper mold 1B and lower mold 2B are used.
For these mold sets, a cushion pin 16 is usually selected which is equipped with two moving bolsters 12 and can obtain an appropriate cushion force as described above.
These moving bolsters 12 are properly used according to production conditions.
For one moving bolster 12 set in the press, the other moving bolster 12 enters a standby state outside the press.
In the meantime, the cushion pins 16 are rearranged, and when ready, they are set in the press.
In order to replace the moving bolster 12, the guide rail 100 can be slid and moved quickly and accurately into and out of the press.
The guide rail 100 is provided on the floor surface, and wheels (not shown) provided on the moving bolster 12 move along the guide rail 100.

In the above configuration, according to the present invention, there is no need for large equipment such as a cushion pad disposed on a pneumatic cylinder or a hydraulic cylinder as in the prior art, and it is possible to effectively realize downsizing of the apparatus. .
In addition, since the cushion force can be controlled for each cushion pin 16 in operation of the device, optimum conditions are set for each part according to the molding state, and the degree of freedom of molding shape and material selection Furthermore, product quality is greatly improved.

Furthermore, specific effects of the die cushion device according to the present invention are listed below.
1) The adjustment of the molding condition can be handled by controlling the cushioning force, and the adjustment work can be performed efficiently in a short time.
2) In this type of device, the arrangement of the cushion pin is also asymmetric due to the asymmetry of the product shape, and receives an eccentric load with respect to the cushion action. In order to solve this problem, a so-called discarding pin is required. However, in the present invention, since an uneven load is not generated by the individual control of the cushion pin 16, the apparatus can be simplified.
3) Since the unit is arranged in units that are reduced in size by replacing the moving bolster 12, it is possible to deal with the unit only by replacing the unit, and the replacement operation at the time of failure can be performed in a short time.
In addition, when used for a plurality of press machines having different specifications, the unit itself is common, so that preparation of spare parts can be simplified.
4) By using the servo drive, it is possible to collect the power generated by the power regeneration and supply it to the drive motor, thereby obtaining an energy saving effect.
5) Since a large air tank, hydraulic unit, etc. are not required, the installation space is made compact, and there is no concern about oil leakage such as hydraulic oil, which is excellent as an environmental measure.
Further, in the hydraulic or pneumatic operation type, the load portion is large and an operation delay occurs. However, in the present invention, since the load is one cushion pin, high followability to the set cushion force can be ensured.
6) In addition, for example, since there is no drilling more than necessary in the bed 13, the machining cost can be reduced and the rigidity can be enhanced.
Since the height position of each cushion pin can be adjusted, an appropriate cushion force can always be transmitted to the blank holder.

(Second Embodiment)
5 and 6 show a configuration example of a die cushion device according to the second embodiment of the present invention.
In addition, the same code | symbol shall be used for the said member corresponding to the said embodiment.

In particular, in this example, the urging drive source of the cushion shaft unit includes a linear motor mechanism, that is, the cushion shaft 25 is driven by the linear motor 24 configured in the frame 23 on the cushion gantry 14 to move up and down. it can.
Each linear motor 24 is controlled by a control signal from the control device 22.
In this case, the linear motor 24 is retracted in a non-use state with respect to the cushion pins 16 that are not selectively arranged.

Also in the second embodiment, each cushion pin 16 is mounted so as to be movable in the vertical direction and is held from the bottom of the blank holder 15.
The cushion pin 16 is selectively arranged corresponding to the type of the workpiece W, and is urged upward via the wear plate 18 by the cushion shaft 25 arranged below the cushion pin 16.

According to the second embodiment, since the linear motor 24 is provided as a drive source for the cushion shaft unit, there is no need to convert rotational motion or the like into linear motion due to the mechanism of the device, and the number of parts can be greatly reduced. The device configuration can be simplified.
Further, the cost of the apparatus is reduced by simplifying the apparatus, and in this case, proper and smooth operation of the apparatus is guaranteed.
Furthermore, a complicated hydraulic unit or the like as in the conventional apparatus is not necessary, and a compact size is realized.

Also in the second embodiment, the upper die 1A and the lower die 2A, the upper die 1B and the lower die 2B are used as shown in FIG.
These mold sets are usually equipped with two moving bolsters 12 and can be moved quickly and accurately into and out of the press by sliding on the guide rails 100 when replacing the moving bolsters 12. .

(Third embodiment)
8 and 9 show a configuration example of a die cushion device according to the third embodiment of the present invention. In addition, the same code | symbol shall be used for the said member corresponding to the said embodiment.

  In particular, in this example, the blank holder 15 is held by the cushion shaft 17 of the cushion shaft unit. The cushion shaft unit is selected according to the workpiece type, and the cushion force can be set and adjusted for each selected cushion shaft unit.

The urging drive source of the cushion shaft unit includes a ball screw mechanism, but in this example, it is configured to have a built-in moving bolster.
The ball screw 21 can be driven by a servo motor 20 fixed below the bolster plate 11 via a frame 26 to move the cushion shaft 17 up and down.
Each servo motor 20 is controlled by a control signal from the control device 22.
In this case, the cushion shaft unit that is not selectively arranged is in a retracted position in a non-use state.

According to the third embodiment, the cushion pin is not used, that is, the blank holder 15 is directly held by the cushion shaft 17 of the cushion shaft unit.
Since the cushion pin is not used, the configuration is simple, and the cushion shaft unit is a built-in type, so that compactness can be achieved.

(Fourth embodiment)
10 and 11 show a configuration example of a die cushion device according to the fourth embodiment of the present invention.
In addition, the same code | symbol shall be used for the said member corresponding to the said embodiment.

In particular, in this example, the blank holder 15 is held by the cushion shaft 25 of the cushion shaft unit.
The cushion shaft unit is selected according to the workpiece type, and the cushion force can be set and adjusted for each selected cushion shaft unit.

The urging drive source of the cushion shaft unit includes a linear motor mechanism. In this example, it is configured to have a built-in moving bolster.
The cushion shaft 25 can be driven up and down by a linear motor 24 configured in the frame 27 below the bolster plate 11.
Each linear motor 24 is controlled by a control signal from the control device 22.
In this case, the cushion shaft unit that is not selectively arranged is in a retracted position in a non-use state.

According to the fourth embodiment, the cushion pin is not used, that is, the blank holder 15 is directly held by the cushion shaft 25 of the cushion shaft unit.
Since the cushion pin is not used, the configuration is simple, and the cushion shaft unit is a built-in type, so that compactness can be achieved.

(Fifth embodiment)
12 and 13 show a configuration example of a die cushion device according to the fifth embodiment of the present invention.
In addition, the same code | symbol shall be used for the said member corresponding to the said embodiment.

The basic configuration of this example is substantially the same as that of the first embodiment (FIGS. 1 and 2). In particular, a pin plate 28 is mounted and fixed to the bottom of the moving bolster 12, and a wear plate 18 corresponding to each cushion shaft 17 is seated on the pin plate 28.
As the cushion shaft 17 rises, the cushion pin 16 is biased upward via the wear plate 18.

  According to the fifth embodiment, it is easy to replace the wear plate 18, and it is always possible to ensure accurate and smooth device operation.

Also in the fifth embodiment, the upper mold 1A and the lower mold 2A, the upper mold 1B and the lower mold 2B are used as shown in FIG.
These mold sets are usually equipped with two moving bolsters 12 and can be moved quickly and accurately into and out of the press by sliding on the guide rails 100 when replacing the moving bolsters 12. .

(Sixth embodiment)
FIG.15 and FIG.16 has shown the structural example of the die-cushion apparatus which concerns on the 6th Embodiment of this invention.
In addition, the same code | symbol shall be used for the said member corresponding to the said embodiment.

The basic configuration of this example is substantially the same as that of the second embodiment (FIGS. 5 and 6).
In particular, the pin plate 28 is mounted and fixed to the bottom of the moving bolster 12, and the wear plate 18 corresponding to each cushion shaft 25 is seated on the pin plate 28.
As the cushion shaft 25 is raised, the cushion pin 16 is biased upward via the wear plate 18.

  In the sixth embodiment, the upper die 1A and the lower die 2A, the upper die 1B, and the lower die 2B are used as shown in FIG.

  These mold sets are usually equipped with two moving bolsters 12 and can be moved quickly and accurately into and out of the press by sliding on the guide rails 100 when replacing the moving bolsters 12. .

(Seventh embodiment)
FIG. 18 shows a configuration example of a die cushion device according to the seventh embodiment of the present invention. In addition, the same code | symbol shall be used for the said member corresponding to the said embodiment.

In this example, the urging drive source of the cushion shaft unit includes a linear motor mechanism, that is, the cushion shaft 25 can be driven up and down by the linear motor 24 configured in the frame 23 on the cushion gantry 14.
Each linear motor 24 is controlled by a control signal from the control device 22.

In this example, a single linear motor 24 biases the plurality of cushion pins 16 with respect to the selected cushion pin 16.
A support plate 29 is disposed at the upper end of the cushion shaft 25, and a single cushion shaft 25 can bias two or three cushion pins 16 via the support plate 29.

  According to the seventh embodiment, the number of linear motors 24 can be reduced, and the simplification and compactness of the apparatus configuration can be realized.

As mentioned above, although this invention was demonstrated with embodiment, this invention is not limited only to these embodiment, A change etc. are possible within the scope of the present invention.
For example, the present invention can be effectively applied to a case where a ball screw mechanism is included as an urging drive source for the cushion shaft unit, particularly with respect to the seventh embodiment.

It is a figure which shows the structural example at the time of the workpiece | work insertion in the die cushion apparatus which concerns on the 1st Embodiment of this invention. It is a figure showing an example of composition at the time of cushion lowering in a die cushion device concerning a 1st embodiment of the present invention. It is a figure which shows the example of a setting of the cushioning force generated with the cushion shaft unit which concerns on the 1st Embodiment of this invention. It is a figure which shows the mode at the time of metal mold | die replacement | exchange in the 1st Embodiment of this invention. It is a figure which shows the structural example at the time of the workpiece | work insertion in the die cushion apparatus which concerns on the 2nd Embodiment of this invention. It is a figure which shows the structural example at the time of the cushion fall in the die cushion apparatus which concerns on the 2nd Embodiment of this invention. It is a figure which shows the mode at the time of metal mold | die replacement | exchange in the 2nd Embodiment of this invention. It is a figure which shows the structural example at the time of the workpiece | work insertion in the die cushion apparatus which concerns on the 3rd Embodiment of this invention. It is a figure which shows the structural example at the time of the cushion descent | fall in the die-cushion apparatus which concerns on the 3rd Embodiment of this invention. It is a figure which shows the structural example at the time of the workpiece | work insertion in the die cushion apparatus which concerns on the 4th Embodiment of this invention. It is a figure which shows the structural example at the time of the cushion fall in the die-cushion apparatus which concerns on the 4th Embodiment of this invention. It is a figure which shows the structural example at the time of the workpiece | work insertion in the die cushion apparatus which concerns on the 5th Embodiment of this invention. It is a figure which shows the structural example at the time of the cushion fall in the die cushion apparatus which concerns on the 5th Embodiment of this invention. It is a figure which shows the mode at the time of metal mold | die replacement | exchange in the 5th Embodiment of this invention. It is a figure which shows the structural example at the time of the workpiece | work insertion in the die cushion apparatus which concerns on the 6th Embodiment of this invention. It is a figure which shows the structural example at the time of the cushion fall in the die-cushion apparatus which concerns on the 6th Embodiment of this invention. It is a figure which shows the mode at the time of metal mold | die replacement | exchange in the 6th Embodiment of this invention. It is a figure which shows the structural example of the die cushion apparatus which concerns on the 7th Embodiment of this invention.

Explanation of symbols

1 Upper die 2 Lower die 3 Slide 10 Die cushion device 11 Bolster plate 12 Moving bolster 13 Bed 14 Cushion mount 15 Blank holder 16 Cushion pin 17 Cushion shaft 18 Wear plate 19 Frame 20 Servo motor 21 Ball screw 22 Controller 23 Frame 24 Linear Motor 25 Cushion shaft 26 Frame 28 Pin plate 100 Guide rail

Claims (8)

A die cushion device that urges the blank holder upward and holds the work peripheral edge between the blank holder and the press upper die,
Having a plurality of cushion shaft units that directly bias the blank holder upward, selecting the cushion shaft unit according to the type of workpiece, and enabling the cushion force to be set and adjusted for each selected cushion shaft unit Feature die cushion device.   The die cushion device according to claim 1, wherein the blank holder is held by a cushion pin of the cushion shaft unit.   The die cushion device according to claim 1, wherein the blank holder is held by a cushion shaft of the cushion shaft unit.   The die cushion device according to any one of claims 1 to 3, further comprising a ball screw mechanism as an urging drive source of the cushion shaft unit.   The die cushion device according to any one of claims 1 to 3, further comprising a linear motor mechanism as an urging drive source of the cushion shaft unit.   The die according to claim 1, wherein a press lower die is mounted on the moving bolster via a bolster plate, and the cushion shaft unit is configured to be built in the moving bolster. Cushion device.   A press lower die is mounted on the moving bolster via a bolster plate, a pin plate is mounted on the bottom of the moving bolster, and a wear plate corresponding to each cushion shaft is seated on the pin plate. The die-cushion apparatus as described in any one of Claims 1-5. The die cushion device according to any one of claims 1 to 7, wherein a plurality of cushion pins are urged by a single cushion shaft unit.

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