JP2013193115A - Multistage press and control method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multistage press having a simple structure, capable of suppressing inclination of dies, and to provide a control method of the multistage press.SOLUTION: A multistage press 1 has a first machining section 40 and a second machining section 50 for press-forming a work, which are arranged along a vertical direction. The multistage press 1 includes: an upper die 10 moving along a vertical direction; a lower die 20 fixed to a predetermined position; an intermediate die 30, which is arranged between the upper die 10 and the lower die 20 and has a forming face corresponding to the forming face of the upper die 10 and a forming face corresponding to the forming face of the lower die 20; and a regulating means for regulating movement of the intermediate die 30. The regulating means regulates movement of the intermediate die 30 so that press-forming of a work is not performed in the second machining section 50 composed of the lower die 20 and the intermediate die 30 until press-forming of the work is completed in the first machining section 40 composed of the upper die 10 and the intermediate die 30.

Description

  The present invention relates to a multistage press apparatus and a control method thereof.

  2. Description of the Related Art Conventionally, a multistage press apparatus in which a plurality of pairs of dies are provided along a vertical direction and presses a plurality of workpieces is widely known.

When a large part such as an automobile part is pressed by such a multi-stage press apparatus, the molding load becomes large. Therefore, the reaction force may cause an uneven load on the mold and the mold may be inclined.
Since the inclination of the mold causes a reduction in processing accuracy or damage of a sliding portion in the multistage press apparatus, various techniques for suppressing the inclination of the mold have been proposed.

Patent Document 1 discloses a technique for suppressing the tilt of a mold by applying a force in a direction opposite to the tilt direction when the slide to which the mold is fixed is tilted.
However, it is necessary to connect a hydraulic pump or the like to an existing facility to form a complicated mechanism, which is disadvantageous in that it causes a significant increase in cost.

JP 2011-051104 A

  An object of the present invention is to provide a multi-stage press apparatus capable of suppressing the inclination of a mold with a simple configuration, and a control method thereof.

  A multi-stage press apparatus according to the present invention is a multi-stage press apparatus comprising a plurality of pairs of dies forming a plurality of processing portions arranged along the vertical direction, wherein the plurality of pairs of dies are at predetermined positions. A fixed mold that is fixed, a movable mold that moves along the vertical direction, and is arranged between the fixed mold and the movable mold, each of which has a molding surface on each of the upper and lower surfaces, and is composed of at least one intermediate mold, Each of the other processed parts is formed so that the press process is not performed in each of the other processed parts of the plurality of processed parts until the press process is completed in one of the processed parts. A restricting means for restricting movement of the pair of molds is provided.

  The multi-stage press apparatus according to the present invention includes two pairs of molds that form two processed parts, and in one processed part, the workpiece is bent or punched, and the other processed part In drawing, drawing is preferably performed on the workpiece.

  In the multistage press apparatus according to the present invention, in the processing portion formed by the movable die and the intermediate die, bending or punching is performed on the workpiece, and in the processing portion formed by the fixed die and the intermediate die. The drawing is performed on the workpiece, and the restricting means is a processing section formed by the fixed mold and the intermediate mold until press work of the workpiece is completed in the processing section formed by the movable mold and the intermediate mold. It is preferable to restrict the movement of the intermediate mold so that the workpiece is not pressed.

  In the multi-stage press apparatus according to the present invention, the fixed die includes a cushion ring that sandwiches and restrains a workpiece installed in a processing portion formed by the fixed die and the intermediate die together with the intermediate die, and the cushion ring is connected to the intermediate die. Preferably, the cushion ring and the plurality of cushion pins function as the restricting means.

  In the multistage press according to the present invention, it is preferable that a portion of the intermediate mold where the two molding surfaces are formed is configured as one member.

  A control method for a multi-stage press apparatus according to the present invention is a control method for a multi-stage press apparatus including a plurality of pairs of dies that form a plurality of processing portions arranged along an up-down direction. A pair of molds constituting the other processed parts are arranged so that the pressing process is not performed in the other processed parts of the plurality of processed parts until the press process is completed in one of the processed parts. Keep them apart.

  According to the multistage press apparatus and the control method thereof according to the present invention, the inclination of the mold can be suppressed with a simple configuration.

The figure which shows the multistage press apparatus which concerns on this invention. The figure which shows the press work of the workpiece | work in a 1st process part. The figure which shows the press work of the workpiece | work in a 2nd process part.

Below, with reference to FIG. 1, the multistage press apparatus 1 which is one Embodiment of the multistage press apparatus which concerns on this invention is demonstrated.
The multistage press apparatus 1 is a press apparatus that presses a plurality of workpieces.
For convenience of explanation, the vertical direction in FIG. 1 is defined as the vertical direction of the multistage press apparatus 1. The vertical direction of the multistage press device 1 coincides with the vertical direction.

  As shown in FIG. 1, the multistage press device 1 includes two pairs of molds arranged along the vertical direction, and a structure for supporting and moving the two pairs of molds.

  The two pairs of molds are composed of an upper mold 10, a lower mold 20, and an intermediate mold 30.

  The upper mold 10 is a mold having a molding surface formed on the lower surface.

  The lower mold 20 is a mold having a molding surface formed on the upper surface. The lower mold 20 is disposed below the upper mold 10 with a predetermined distance from the upper mold 10. The lower mold 20 is formed with a recess recessed downward so as to surround the molding surface, and a cushion ring 21 is provided in the recess.

  The cushion ring 21 is a member for sandwiching and restraining the outer edge portion of the work together with the intermediate mold 30 when the work is drawn by the lower mold 20 and the intermediate mold 30. The cushion ring 21 is biased upward by a biasing means such as a gas cylinder via a plurality of cushion pins 22.

The cushion pin 22 is a bar material extending in the vertical direction. The upper end portion of the cushion pin 22 is fixed to the cushion ring 21, and the lower end portion of the cushion pin 22 is fixed to the urging means.
A through hole (not shown) is formed in the cushion pin 22 along a direction orthogonal to the vertical direction. By inserting a rod-shaped restricting pin (not shown) through the through hole formed in the cushion pin 22, the cushion pin 22 is in a “fixed state”, and the restricting pin is pulled out from the through hole. The pin 22 becomes “movable”. The restriction pin is configured to be inserted into the through hole at a predetermined timing by a cam or the like, and the “fixed state” and the “movable state” of the cushion pin 22 are switched at a predetermined timing. Become.
When the plurality of cushion pins 22, 22... Are set in the “fixed state”, the cushion ring 21 supported from below by the plurality of cushion pins 22, 22. Be regulated.
When the plurality of cushion pins 22, 22... Are set in the “movable state”, the cushion ring 21 supported from below by the plurality of cushion pins 22, 22. When pressed downward against the urging force, it moves downward.
Detailed operation modes of the cushion ring 21 and the cushion pin 22 will be described later.

The intermediate mold 30 is a mold in which molding surfaces are formed on the upper surface and the lower surface, respectively, and is disposed between the upper mold 10 and the lower mold 20. The molding surface formed on the upper surface of the intermediate mold 30 is formed so as to correspond to the molding surface of the upper mold 10, and the molding surface formed on the lower surface of the intermediate mold 30 corresponds to the molding surface of the lower mold 20. Is formed. The intermediate mold 30 is manufactured as one member by a full mold casting method or the like.
As described above, the intermediate mold 30 is configured as one member, and a molding surface is formed on each of the upper surface and the lower surface thereof.
Therefore, the height (vertical dimension) of the intermediate mold 30 can be reduced compared with the conventional intermediate mold composed of the lower mold and the upper mold fixed to the upper and lower surfaces of the plate-shaped die plate, respectively. Therefore, the height of the multistage press apparatus 1 can be suppressed.
In the present embodiment, all of the intermediate mold 30 is configured as one member. However, at least a portion of the intermediate mold 30 where the two molding surfaces are formed may be configured as one member.

In the multistage press apparatus 1, a pair of molds formed by the molding surface of the upper mold 10 and the molding surface formed on the upper surface of the intermediate mold 30, which are the two pairs of molds, and the molding surface of the lower mold 20, The first processed part 40 and the second processed part 50 are configured by a pair of molds formed by a molding surface formed on the lower surface of the intermediate mold 30.
Specifically, the upper die 10 and the intermediate die 30 constitute a first processed portion 40, and the lower die 20 and the intermediate die 30 constitute a second worked portion 50.
That is, in the multistage press apparatus 1, two processed parts are arranged in the vertical direction from the top in the order of the first processed part 40 and the second processed part 50.

The 1st process part 40 and the 2nd process part 50 are comprised so that a press work can be performed with respect to each respectively corresponding workpiece | work.
In the first processing portion 40, the workpiece is bent or punched by the upper mold 10 and the intermediate mold 30.
In the second processing unit 50, drawing is performed on the workpiece by the lower mold 20 and the intermediate mold 30.

  The structure constituting a part of the multistage press apparatus 1 includes a bolster 60, a plurality of guide posts 70, 70..., A slide 80, and a plurality of support members 90, 90.

  The bolster 60 is a rectangular plate material, and the lower mold 20 is fixed to the upper surface thereof.

The guide post 70 is a substantially columnar member extending along the vertical direction. The lower end portion of the guide post 70 is fixed to the bolster 60, and the upper end portion of the guide post 70 is fixed to a predetermined member (not shown) provided above the slide 80.
Although not shown, in the present embodiment, four guide posts 70, 70, 70, and 70 are provided and arranged at the four corners of the upper surface of the bolster 60.

The slide 80 is a rectangular plate material, and the upper mold 10 is fixed to the lower surface thereof. In the slide 80, a plurality of through holes for inserting a plurality of guide posts 70, 70... Are formed along the vertical direction. In the present embodiment, four through holes for inserting the four guide posts 70, 70, 70, 70 are formed along the vertical direction at the four corners of the plate surface of the slide 80. The slide 80 slides along the vertical direction on the outer peripheral surfaces of the plurality of guide posts 70, 70... By an actuator (not shown) such as a hydraulic cylinder.
As the slide 80 moves, the upper mold 10 fixed to the lower surface of the slide 80 moves along the vertical direction.
That is, in this embodiment, the upper mold 10 functions as a movable mold, and the lower mold 20 functions as a fixed mold.

The support member 90 is a gas cylinder that supports the intermediate mold 30.
The support member 90 includes a fixed portion 91 and a movable portion 92.
The fixing portion 91 is disposed outside the lower mold 20 and is fixed to the upper surface of the bolster 60. The fixed portion 91 supports the movable portion 92.
The movable portion 92 is formed in a rod shape and protrudes upward from the upper end surface of the fixed portion 91. The upper end portion of the movable portion 92 is fixed near the outer edge portion on the lower surface of the intermediate mold 30. The movable portion 92 is urged upward at a predetermined pressure, and when it is pressed downward against the pressure, the movable portion 92 moves downward.

Thus, the plurality of support members 90, 90... Support the intermediate mold 30 from below. The plurality of support members 90, 90... Support the intermediate mold 30 with a predetermined distance from the lower mold 20 when the intermediate mold 30 is not pressed from above with a predetermined pressure or more. To do. When the intermediate mold 30 is pressed from above with a predetermined pressure or more, the intermediate mold 30 moves downward so as to approach the lower mold 20.
Although not shown, in the present embodiment, four support members 90, 90, 90, and 90 are provided, and the four support members 90, 90, 90, and 90 are movable parts 92, 90. 92, 92, and 92 are disposed so as to be fixed to the four corners of the lower surface of the intermediate mold 30.

  Below, with reference to FIG.2 and FIG.3, the operation | movement aspect of the multistage press apparatus 1 is demonstrated.

As shown in FIG. 2, when the slide 80 is lowered, the upper die 10 approaches the intermediate die 30, and the workpiece is pressed (bending or punching) in the first machining portion 40.
When the workpiece is pressed in the first processing section 40, the plurality of cushion pins 22, 22... Are set to the “fixed state”. That is, the restriction pin is inserted into the through hole formed in each cushion pin 22, and the downward movement of the cushion ring 21 supported from below by the plurality of cushion pins 22, 22.
Therefore, the intermediate mold 30 is lowered as the upper mold 10 is lowered, but the further lowering is restricted by the cushion ring 21. And the press work of the workpiece | work in the 1st process part 40 is performed in the state which the intermediate mold | type 30 and the cushion ring 21 contacted.
Thereby, it is possible to press the workpiece in the first processing unit 40 in a state where the intermediate die 30 is fixed.
Therefore, the press work of the work by the upper mold 10 and the intermediate mold 30 can be performed in substantially the same manner as the press work by the pair of molds provided in the one-stage press device, and the inclination of the upper mold 10 and the intermediate mold 30 can be performed. Can be suppressed.
As described above, when the workpiece is pressed in the first processing portion 40, the cushion ring 21 and the plurality of cushion pins 22, 22... Function as a restricting means that restricts the movement of the intermediate die 30, and the upper die 10 and The inclination of the intermediate mold 30 can be suppressed.

As shown in FIG. 3, after the press working (bending or punching) of the workpiece is completed in the first working portion 40, the plurality of cushion pins 22, 22... Are set to “movable state”. The slide 80 is further lowered.
When the slide 80 is further lowered, the intermediate die 30 approaches the lower die 20 against the urging force of the cushion ring 21 and the support member 90, and the workpiece is pressed (drawing) at the second machining portion 50. Is called.
At this time, since the press working of the workpiece in the first machining section 40 is completed, the upper mold 10 and the intermediate mold 30 function as an integral rigid body.
Thereby, it is possible to press the workpiece in the second processing unit 50 in a state where the intermediate die 30 is fixed.
Therefore, the press work of the workpiece by the lower mold 20 and the intermediate mold 30 can be performed in substantially the same manner as the press work by the pair of molds provided in the single-stage press device, and the inclination of the lower mold 20 and the intermediate mold 30 can be performed. Can be suppressed.
As described above, the movement of the intermediate mold 30 is restricted by the cushion ring 21 and the plurality of cushion pins 22, 22... It is possible to suppress the inclination of the lower mold 20 and the intermediate mold 30 at the time of pressing the workpiece in the second machining section 50.

As described above, in the multistage press device 1, the plurality of cushion pins 22, 22..., Which are existing members, are configured to be switchable between the “fixed state” and the “movable state” by the restriction pins. , The cushion ring 21 and the plurality of cushion pins 22, 22... Function as regulating means for regulating the movement of the intermediate mold 30.
That is, the inclination of the mold in the multistage press apparatus 1 can be suppressed at a low cost only by making a simple improvement to an existing member.
In the present embodiment, the cushion pins 22 are configured to be switchable between a “fixed state” and a “movable state” using the restriction pins. However, the present invention is not limited to this.
For example, each cushion pin 22 may be configured to be switchable between a “fixed state” and a “movable state” using a servo motor.
Further, in the case where each cushion pin 22 is controlled using a servo motor, each cushion pin 22 is not set to a “fixed state”, but at the time of pressing the workpiece in the first machining portion 40, the first machining portion 40 is used. The servo motor may be controlled so that the intermediate mold 30 is biased upward with a force larger than the molding force at.
Further, instead of using the cushion ring 21 and the plurality of cushion pins 22, 22,... As a restricting means, a member that can be detached between the lower mold 20 and the intermediate mold 30 can be used as the restricting means. is there.

In the present embodiment, the first processing unit 40, the second processing unit, using the cushion ring 21 that functions as a restricting unit that controls the movement of the intermediate mold 30 and the plurality of cushion pins 22, 22. Although the workpieces were pressed in the order of 50, the present invention is not limited to this configuration.
For example, it is also possible to apply a member that is detachable between the upper die 10 and the intermediate die 30 as the regulating means, and press the workpiece in the order of the second working portion 50 and the first working portion 40. .

In addition, the multistage press device 1 in this embodiment includes two pairs of molds including an upper mold 10 as a movable mold, a lower mold 20 as a fixed mold, and a single intermediate mold 30. The number of pairs (the number of processed parts) is not limited.
In detail, the multistage press apparatus according to the present invention may include a movable mold, a fixed mold, and at least one intermediate mold.
For example, in a multi-stage press apparatus having a movable mold, a fixed mold, and two intermediate molds, and having three machining sections, a machining section formed by the movable mold and an intermediate mold adjacent to the movable mold is movable. The workpiece may be pressed in the order of the processing portion formed by the intermediate die adjacent to the die and the intermediate die adjacent to the fixed die, and the processing portion formed by the intermediate die adjacent to the fixed die and the fixed die.

In addition, the intermediate mold 30 in the present embodiment is configured as a member having a molding surface on the upper and lower surfaces. However, the intermediate mold 30 includes a lower mold and an upper mold fixed to the upper and lower surfaces of a plate-shaped die plate, respectively. It is also possible to apply an intermediate mold.
In the present embodiment, the upper mold 10 is a movable mold and the lower mold 20 is a fixed mold. However, the upper mold 10 may be a fixed mold and the lower mold 20 may be a movable mold.

1 Multi-stage press machine 10 Upper mold (movable type)
20 Lower mold (fixed mold)
DESCRIPTION OF SYMBOLS 21 Cushion ring 22 Cushion pin 30 Intermediate type 40 1st process part 50 2nd process part 60 Bolster 70 Guide post 80 Slide 90 Support member 91 Fixed part 92 Movable part

Claims (6)

A multi-stage press apparatus comprising a plurality of pairs of dies forming a plurality of processing portions arranged along the vertical direction,
The plurality of pairs of molds are disposed between a fixed mold fixed at a predetermined position, a movable mold that moves in the vertical direction, and the fixed mold and the movable mold, and a molding surface is provided on each of the upper and lower surfaces. Having at least one intermediate mold,
The other processing parts are set so that the pressing process is not performed in the other processing parts of the plurality of processing parts until the pressing process is completed in one processing part of the plurality of processing parts. A restricting means for restricting movement of the pair of molds formed is provided.
A multi-stage press device characterized by that. It has two pairs of molds that form two processed parts,
In one processing part, bending or punching is performed on the workpiece,
In the other processing part, drawing is performed on the workpiece.
The multi-stage press apparatus according to claim 1. In the processing part formed by the movable mold and the intermediate mold, the workpiece is subjected to bending or punching,
In the processing part formed by the fixed mold and the intermediate mold, drawing is performed on the workpiece,
The restricting means is configured to prevent the workpiece from being pressed in the processing portion formed by the fixed die and the intermediate mold until the press processing of the workpiece is completed in the processing portion formed by the movable die and the intermediate die. Regulate the movement of the intermediate type,
The multistage press apparatus according to claim 2, wherein The fixed mold is
A cushion ring that sandwiches and restrains a workpiece installed in a processing portion formed by the fixed mold and the intermediate mold together with the intermediate mold;
A plurality of cushion pins that urge the cushion ring toward the intermediate mold,
The cushion ring and the plurality of cushion pins function as the restricting means;
The multi-stage press apparatus according to claim 3. The portion where the two molding surfaces in the intermediate mold are formed is configured as one member.
The multistage press apparatus according to any one of claims 1 to 4, wherein the multistage press apparatus is characterized. A control method for a multi-stage press apparatus comprising a plurality of pairs of dies forming a plurality of processing parts arranged along the vertical direction,
The other processing parts are set so that the pressing process is not performed in the other processing parts of the plurality of processing parts until the pressing process is completed in one processing part of the plurality of processing parts. A pair of molds to be separated from each other,
A control method for a multi-stage press machine.

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