JP2013193125A - Multistage press device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multistage press device which suppresses a tilt of an intermediate mold.SOLUTION: A multistage press device 1 performs press work on a plurality of workpieces and includes an upper mold 10 with a shaping face formed on a lower surface, a lower mold 20 with a shaping face formed on an upper surface, an intermediate mold 30 with shaping faces formed on upper and lower surfaces respectively, and reactive-force exerting devices 40, 50 each of which exerts a reactive force on the intermediate mold 30 so as to push back the intermediate mold 30. The reactive-force exerting devices 40, 50 are provided between the upper mold 10 and the intermediate mold 30 and between the lower mold 20 and the intermediate mold 30 respectively, and they are arranged such that press work can be conducted by pressing the reactive-force exerting device 40 with the upper mold 10 and the intermediate mold 30 and pressing the reactive-force exerting device 50 with the lower mold 20 and the intermediate mold 30 and furthermore arranged in such positions that rotational moments on the intermediate mold 30 can be compensated.

Description

  The present invention relates to a multistage press apparatus.

  Conventionally, a multistage press apparatus in which a plurality of upper molds and lower molds, which are a pair of molds, are provided in the vertical direction and presses a plurality of workpieces is widely known (see, for example, Patent Document 1).

  In the multi-stage press as described above, an upper mold and a lower mold (hereinafter referred to as “intermediate upper mold” and “intermediate lower mold”) disposed between an upper mold positioned at the upper end and a lower mold positioned at the lower end. However, the height (vertical length) of the multi-stage press apparatus is increased, causing problems such as an increase in equipment costs.

  Therefore, the present inventors have proposed that the above-described die plate is removed from the multi-stage press apparatus to suppress the height of the multi-stage press apparatus, and the intermediate upper mold and the intermediate lower mold fixed to the die plate are provided. Invented a multi-stage press apparatus comprising an intermediate die configured as one member.

However, as shown in FIG. 5, the intermediate mold does not include the die plate, and is configured as a single member having molding surfaces formed on the upper and lower surfaces. It is easy to receive and is likely to tilt.
If the intermediate mold is tilted, there is a possibility that the processing accuracy may be lowered. Therefore, it is highly desired to suppress the tilt of the intermediate mold.

JP 2000-015496 A

  This invention makes it a subject to provide the multistage press apparatus which can suppress the inclination of an intermediate type | mold.

  A multi-stage press apparatus according to the present invention is a multi-stage press apparatus that performs press processing on a plurality of workpieces, an upper mold having a molding surface formed on a lower surface, and a lower surface of the upper mold, and molding on an upper surface. A plurality of pairs of molds each including a lower mold on which a surface is formed, and at least one intermediate mold that is disposed between the upper mold and the lower mold and each has a molding surface on each of the upper and lower surfaces And a reaction force applying device that applies a reaction force that pushes back the intermediate die to the intermediate die, and the reaction force applying device is located between at least a pair of molds of the plurality of pairs of molds. It is provided so as to be pressed by the pair of molds at the time of press working, and at a position where the rotational moment generated in the intermediate mold can be canceled.

  In the multistage press device according to the present invention, it is preferable that the reaction force applying device is disposed so as to be pressed by a portion other than the molding surfaces of the pair of molds during press working.

  In the multistage press device according to the present invention, it is preferable that the reaction force applying device is disposed in the vicinity of an outer edge portion of the pair of molds.

  In the multistage press device according to the present invention, the reaction force applying device is formed in a plate-like fixing portion and a plate shape, and one plate surface thereof faces one plate surface of the fixing portion. And a contact portion disposed at a predetermined interval with respect to the fixed portion, and expands and contracts along the pressing direction, and both end portions in the expansion and contraction direction are one plate surface of the fixed portion, and the contact A compression coil spring fixed to one plate surface of the portion, and a protrusion protruding from the one plate surface of the fixed portion along the expansion / contraction direction of the compression coil spring and inserted into the compression coil spring. The length of the projecting portion along the expansion / contraction direction of the compression coil spring is smaller than the natural length of the compression coil spring, and the projecting portion is in contact with the pair of molds immediately before the pair of molds come closest to each other. The length is set so that it touches the part. Rukoto is preferable.

  According to the multistage press apparatus according to the present invention, the inclination of the intermediate mold can be suppressed.

The figure which shows the multistage press apparatus which concerns on this invention. The figure which shows the mode of the press work by the multistage press apparatus which concerns on this invention. The figure which shows the operation | movement aspect of a reaction force provision apparatus. The figure which shows the relationship between the stroke position of the slide of a multistage press apparatus, and the magnitude | size of the reaction force provided to an intermediate type | mold from a reaction force provision apparatus. The figure which shows a mode that an intermediate mold | type inclines in the conventional multistage press apparatus.

Below, with reference to FIG.1 and FIG.2, 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 up and down direction in FIG. 1 is defined as the up and down direction of the multistage press apparatus 1, and the left and right direction in FIG. 1 is defined as the left and right direction of the multistage press apparatus 1. The vertical direction of the multistage press apparatus 1 coincides with the press direction.

  As shown in FIG. 1, the multistage press device 1 includes an upper die 10, a lower die 20, an intermediate die 30, and reaction force applying devices 40 and 50.

  The upper mold 10, the lower mold 20, and the intermediate mold 30 function as two pairs of molds. The upper mold 10, the lower mold 20, and the intermediate mold 30 are arranged along the vertical direction in the order of the upper mold 10, the intermediate mold 30, and the lower mold 20 from above.

The upper mold 10 is a mold in which a molding surface is formed on a part of its lower surface (near the center in the left-right direction). The upper die 10 is fixed to a slide (not shown) forming a part of the multistage press device 1 and is configured to reciprocate along the vertical direction.
The upper mold 10 includes a pad 11.
The pad 11 is a member for sandwiching a part of the workpiece together with the intermediate die 30 and fixing the workpiece when the upper die 10 and the intermediate die 30 are pressed (for example, bending) to the workpiece. It is. The pad 11 is urged downward by a plurality of urging means 12, 12,..., And moves upward when pressed against the urging force of the plurality of urging means 12, 12,. .
The biasing means 12 is an actuator such as a gas cylinder. In FIG. 1, only two urging means 12 and 12 are shown.

The lower mold 20 is a mold in which a molding surface is formed on a part of its upper surface (near the center in the left-right direction). The lower mold 20 is disposed below the upper mold 10 with a predetermined interval from the upper mold 10. The lower die 20 is fixed to a bolster (not shown) that forms a part of the multistage press device 1, and is configured so that relative movement cannot be performed in the multistage press device 1.
The lower mold 20 includes a cushion ring 21.
The cushion ring 21 is a member that functions as a wrinkle retainer by sandwiching the outer edge portion of the workpiece together with the intermediate die 30 when the lower die 20 and the intermediate die 30 are pressed (for example, drawing) on the workpiece. is there. The cushion ring 21 is urged upward by the plurality of urging means 22, 22... And moves downward when pressed against the urging force of the plurality of urging means 22, 22. To do.
The biasing means 22 is an actuator such as a gas cylinder. In FIG. 1, only two urging means 22 and 22 are shown.

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 die 30 is supported by a predetermined member forming a part of the multistage press device 1 and is configured to reciprocate along the vertical direction in conjunction with the movement of the upper die 10. 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.

  The reaction force applying devices 40 and 50 are devices that apply to the intermediate die 30 a reaction force that pushes the intermediate die 30 back to a normal position when the intermediate die 30 is tilted during pressing. The reaction force applying devices 40 and 50 are provided between the upper mold 10 and the intermediate mold 30 and between the lower mold 20 and the intermediate mold 30, respectively.

  The reaction force applying device 40 is fixed to a portion near the right end portion on the lower surface of the upper mold 10. The reaction force imparting device 40 is disposed so as to be pressed by a portion near the right end portion on the lower surface of the upper die 10 and a portion near the right end portion on the upper surface of the intermediate die 30 during press working.

  The reaction force applying device 50 is fixed to a portion near the left end portion on the upper surface of the lower mold 20. The reaction force imparting device 50 is disposed so as to be pressed by a portion near the left end portion on the upper surface of the lower die 20 and a portion near the left end portion on the lower surface of the intermediate die 30 during press working.

Here, in the present embodiment, it is assumed that the intermediate mold 30 is tilted so that the right end portion of the intermediate mold 30 is raised and the left end portion of the intermediate mold 30 is lowered (see FIG. 5). The positions where the applicators 40 and 50 are installed are determined.
Since the inclination direction of the intermediate mold 30 can be grasped in advance by a simulation or the like based on a molding load, the reaction force applying devices 40 and 50 may be arranged at positions where the rotational moment generated in the intermediate mold 30 can be canceled.

Thus, as shown in FIG. 2, the reaction force applying device 40 is pressed and lifted by the portion near the right end portion on the lower surface of the upper die 10 and the portion near the right end portion on the upper surface of the intermediate die 30 during press working. A reaction force that pushes back the right end portion of the intermediate mold 30 facing downward is applied to the intermediate mold 30 (see the white arrow on the right side in FIG. 2). Further, the reaction force applying device 50 is pressed by a portion near the left end portion on the upper surface of the lower die 20 and a portion near the left end portion on the lower surface of the intermediate die 30 at the time of pressing, and the left end portion of the intermediate die 30 that descends. Is applied to the intermediate mold 30 (see the white arrow on the left side in FIG. 2).
Thereby, it can suppress that the intermediate mold | type 30 inclines at the time of press work.

In the present embodiment, the reaction force applying device 40 is pressed by a portion near the right end portion on the lower surface of the upper die 10 and a portion near the right end portion on the upper surface of the intermediate die 30 during press working. Has been placed.
As described above, since the molding surface of the upper mold 10 is formed in the vicinity of the central portion of the lower surface of the upper mold 10 in the left-right direction, the portion near the right end of the lower surface of the upper mold 10 is the lower surface of the upper mold 10. It is a part other than the molding surface. Further, since the upper molding surface of the intermediate mold 30 is formed in the vicinity of the central portion of the upper surface of the intermediate mold 30 in the left-right direction, the portion near the right end portion of the upper surface of the intermediate mold 30 is on the upper surface of the intermediate mold 30. It is a part other than the molding surface.
Thus, since the reaction force imparting device 40 is installed using a portion other than the molding surface of the mold, it does not adversely affect the press work.
In order to effectively cancel the rotational moment generated in the intermediate mold 30, it is preferable to apply a reaction force to a portion near the outer edge portion of the intermediate mold 30.
In this respect, since the reaction force imparting device 40 is installed using a portion in the vicinity of the outer edge portion of the mold, the rotational moment generated in the intermediate mold 30 can be effectively canceled.
Note that the reaction force applying device 50 is the same as the reaction force applying device 40, and thus detailed description thereof is omitted.

Below, with reference to FIG. 3, the reaction force provision apparatus 40 is demonstrated in detail.
Note that the reaction force application device 50 is configured in the same manner as the reaction force application device 40, and thus detailed description thereof is omitted.

  As shown in FIG. 3A, the reaction force applying device 40 includes a fixing portion 41, a contact portion 42, a spring 43, and a protruding portion 44.

  The fixing portion 41 is formed in a flat plate shape, and is arranged so that the plate surface is orthogonal to the vertical direction. The fixing portion 41 is fixed to a portion near the right end portion on the lower surface of the upper mold 10 (see FIG. 1).

  The contact part 42 is formed in a flat plate shape, and is arranged so that the plate surface is orthogonal to the vertical direction. The abutting portion 42 is arranged at a predetermined interval with respect to the fixing portion 41 with the upper surface thereof facing the lower surface of the fixing portion 41.

The spring 43 is a compression coil spring that expands and contracts along the press direction (up and down direction). The spring 43 is interposed between the fixed portion 41 and the contact portion 42, and the upper end portion and the lower end portion of the spring 43 are fixed to the lower surface of the fixed portion 41 and the upper surface of the contact portion 42, respectively. Yes. The outer diameter of the spring 43 is set to a value smaller than the outer dimension of the fixed part 41 and the outer dimension of the contact part 42.
The spring 43 contracts when the reaction force applying device 40 is pressed by the upper mold 10 and the intermediate mold 30 during press working.

The protruding portion 44 is a columnar member that protrudes from the lower surface of the fixed portion 41 toward the contact portion 42 along the vertical direction. The protrusion 44 is made of a material having high rigidity. The lower surface of the protruding portion 44 is formed to be parallel to the upper surface of the contact portion 42. The protruding portion 44 is inserted into the spring 43.
The vertical dimension of the protrusion 44 is set to a value smaller than the natural length of the spring 43 (the vertical dimension of the spring 43 in a state where no load is applied). Further, the vertical dimension of the protruding portion 44 is such that the lower surface of the protruding portion 44 comes into contact with the upper surface of the contact portion 42 immediately before the upper die 10 and the intermediate die 30 are closest to each other during press working. Is set.

  When the upper die 10 is lowered during the press working, first, the abutting portion 42 of the reaction force applying device 40 abuts on the upper surface of the intermediate die 30. When the upper die 10 is further lowered, the spring 43 contracts as shown in FIG. Further, immediately before the upper die 10 is lowered and the upper die 10 reaches the bottom dead center, that is, immediately before the upper die 10 and the intermediate die 30 are closest to each other, as shown in FIG. Contracts, and the lower surface of the protrusion 44 contacts the upper surface of the contact portion 42.

FIG. 4 is a diagram illustrating the relationship between the stroke position of the slide in the multistage press device 1 and the magnitude of the reaction force applied from the reaction force applying device 40 to the intermediate mold.
As shown in FIG. 4, the reaction force is applied stepwise to the intermediate mold 30 by the operation of the reaction force application device 40 as described above.
That is, in a stage before the lower surface of the projecting portion 44 contacts the upper surface of the contact portion 42, the reaction force applying device 40 applies a relatively small reaction force by the spring 43 to the intermediate mold 30, After the lower surface of the portion 44 comes into contact with the upper surface of the contact portion 42, the reaction force applying device 40 applies a relatively large reaction force by the protruding portion 44 to the intermediate mold 30.

At the time of press working, the inclination of the intermediate die 30 tends to gradually increase. Therefore, a relatively small reaction force by the spring 43 is applied to the intermediate die 30 until the upper die 10 reaches the vicinity of the bottom dead center, and the position of the intermediate die 30 is corrected at the initial stage of press working. Thus, the inclination of the intermediate mold 30 can be effectively suppressed.
In addition, since the spring 43 contracts, it is advantageous in that a reaction force can be applied to the intermediate die 30 from the initial stage of the press work without inhibiting the press work.
Moreover, since the protrusion part 44 has high rigidity, if the vertical dimension is too large, it will have a bad influence on press work. Further, if the vertical dimension of the protruding portion 44 is too small, the reaction force cannot be favorably applied to the intermediate mold 30. Therefore, the vertical dimension of the protrusion 44 may be adjusted as appropriate within a range in which the inclination of the intermediate mold 30 can be suppressed.

In the present embodiment, the reaction force applying device 40 is fixed to a portion near the right end portion on the lower surface of the upper mold 10, but the reaction force applying device 40 is fixed to a portion near the right end portion on the upper surface of the intermediate mold 30. It is also possible.
Further, in the present embodiment, the fixing portion 41 of the reaction force applying device 40 is fixed to a portion near the right end portion of the lower surface of the upper die 10, but the contact portion 42 of the reaction force applying device 40 is fixed to the lower surface of the upper die 10. It is also possible to fix to a portion in the vicinity of the right end portion of.

  In the present embodiment, one reaction force application device 40 is provided between the upper mold 10 and the intermediate mold 30, but the number of reaction force application devices 40 is not limited. A plurality of reaction force applying devices 40, 40... May be arranged at appropriate positions so as to effectively cancel the rotational moment generated in the intermediate mold 30.

  In the present embodiment, the reaction force applying device 40 is provided between the upper die 10 and the intermediate die 30, and the reaction force applying device 50 is provided between the lower die 20 and the intermediate die 30. Only one of the applying device 40 and the reaction force applying device 50 may be provided.

In addition, although the multistage press apparatus 1 in this embodiment has one intermediate mold | type 30, the number of intermediate molds of the multistage press apparatus which concerns on this invention is not limited.
In a multistage press apparatus provided with a plurality of intermediate dies, a reaction force applying device may be appropriately disposed at a position where the rotational moment generated in each intermediate dies can be canceled.

DESCRIPTION OF SYMBOLS 1 Multistage press apparatus 10 Upper mold | type 20 Lower mold | type 30 Intermediate mold | type 40 Reaction force application apparatus 41 Fixing part 42 Contact part 43 Spring (compression coil spring)
44 Protruding part 50 Reaction force applying device

Claims (4)

A multi-stage press device that presses a plurality of workpieces,
An upper mold having a molding surface formed on the lower surface, a lower mold disposed below the upper mold, a molding surface formed on the upper surface, and disposed between the upper mold and the lower mold, A plurality of pairs of molds each comprising at least one intermediate mold each having a molding surface;
A reaction force applying device that applies a reaction force to push back the intermediate mold to the intermediate mold,
The reaction force applying device is:
Provided between at least a pair of molds of the plurality of pairs of molds;
At the time of pressing, it is arranged to be pressed by the pair of molds,
It is arranged at a position where the rotational moment generated in the intermediate mold can be canceled,
A multi-stage press device characterized by that. The reaction force applying device is:
It is arranged to be pressed by a portion other than the molding surfaces of the pair of molds at the time of pressing.
The multi-stage press apparatus according to claim 1. The reaction force applying device is:
Arranged near the outer edge of the pair of molds,
The multi-stage press device according to claim 1 or 2, wherein the multi-stage press device is provided. The reaction force applying device is:
A fixing part formed in a plate shape;
A contact portion that is formed in a plate shape, with one plate surface facing one plate surface of the fixed portion, and arranged at a predetermined interval with respect to the fixed portion;
A compression coil spring that expands and contracts along the pressing direction, and both end portions in the expansion and contraction direction are fixed to one plate surface of the fixed portion and one plate surface of the contact portion;
Projecting along the expansion and contraction direction of the compression coil spring from one plate surface of the fixed portion, and including a projection portion inserted into the compression coil spring,
The length of the projecting portion along the expansion / contraction direction of the compression coil spring is smaller than the natural length of the compression coil spring, and the projecting portion contacts the contact portion immediately before the pair of molds come closest to each other. It is set to a length that makes contact with
The multi-stage press device according to any one of claims 1 to 3, wherein the multi-stage press device is provided.

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