JP2001347319A - Press forming device for metal plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the rotation of a rotary die even when an external force is added to the rotary die from the outside during press forming. SOLUTION: The rotary die 4 is rotatably provided in the cavity 2 of a lower die 1, a metal plate 3 is press-formed between the lower die 1 provided with the rotary die 4 and an upper die 6 and, after that, the rotary die 4 is separated from the metal plate 3 by rotating the rotary die 4 by a specified angle with a cylinder device 5. A horizontal supporting surface 8 and vertical supporting surface 7 for supporting the rotary die 4 at press forming are provided at the inside surface of the cavity 2. A press-contact member 20 of the rotary die connected with the driving shaft 5a of the cylinder device 5 is arranged on the sliding surface 2a of the inside surface of the cavity 2. This press-contact member 20 is provided with the press-contact parts 24 and 25 for press-contact and rotating the rotary die 4 by the specified angle by the advancing and retreating operation of the driving shaft 5a and provided with the horizontal supporting surface 21 for supporting the rotary die 4 at press forming and obstructing the rotation of the rotary die 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press forming apparatus for a plate material, and more particularly, to a plate material formed in a shape suitable for press forming a product having a curved surface or a bulge such as a fender or a pillar of an automobile. The present invention relates to a press molding device.

[0002]

2. Description of the Related Art Conventionally, as an apparatus of this type, for example, FIG.
As shown in FIG. 4, a rotary mold c is rotatably provided in a cavity b of a lower mold a, and a shift bending portion d of the rotary mold c is provided.
The press-forming blade is formed on the upper mold f, and the support portion g is formed on the inner surface of the cavity b, and the contact portion h is formed on the outer peripheral surface of the rotary mold c. There is one formed so that the g and the contact portion h are in surface contact (for example, see Japanese Patent Application Laid-Open No. 8-276218).

[0003] As shown in FIG.
The extension lines E of the contact surfaces of the lower mold and the rotary mold are formed so as to intersect with each other, and are provided with a support portion and a contact portion having this kind of structure. Therefore, in the case of the conventional product, if the contact surface between the support portion and the abutting portion is not plane-machined with high precision, the wear at this portion becomes severe and maintenance becomes difficult. And positioning must be performed with high precision. Therefore, from this point, the conventional product
Rotational processing and cavity inner surface processing inevitably took time and effort.

[0004]

In order to solve such a problem of the conventional product, the present applicant has previously proposed a press forming apparatus for a plate material (see Japanese Patent Application No. 11-220975).
The present invention according to this application provides a receiving portion for supporting a rotary mold at the time of press molding on each of inner surfaces orthogonal to the cavity, and a corresponding contact portion on the outer surface of the corresponding rotary die with the receiving portion. The receiving portion and the contact portion are arranged so as to be shifted by 90 degrees. Therefore, according to this, not only can the press pressure be received in a stable state, but also the positioning of the contact surface of the receiving portion and the contact portion, the planar processing of the contact surface can be simplified and speeded up, and the maintenance is facilitated. Can be

[0005] However, in the case of the above proposed apparatus, when a force is applied from outside to the rotary mold during press molding,
There was a problem that the rotary mold would rotate.

The present invention has been proposed in view of such problems of the prior art. Therefore, the technical problem of the present invention is that when the rotary mold receives an external force during press molding,
An object of the present invention is to provide a press forming apparatus for a plate formed so as to reliably prevent rotation of a rotary mold.

[0007]

The present invention employs the following technical means in order to solve the above-mentioned problems. That is, according to the present invention, as shown in FIG. 1, a rotary die 4 is rotatably provided in a cavity 2 formed in a lower die 1, and a lower die 1 and an upper die 6 having the rotary die 4 are provided. After the plate material 3 is press-formed between the plates, the rotary die 4 is rotated by a predetermined angle by a cylinder device 5 to release the rotary die 4 from the plate material 3. A horizontal bearing surface 8 and a vertical bearing surface 7 for supporting the mold 4 at the time of press molding are provided on the inner surface of the cavity 2, respectively, and a rotary die contact connected to a drive shaft 5 a of the cylinder device 5. A member 20 is provided on a sliding surface 2a provided on the inner surface of the cavity 2, and the rotary pressing member 20 presses the rotary die 4 by advancing and retreating the drive shaft 5a of the cylinder device 5. Place the rotary mold 4 Provided with a press-contact portions 24, 25 for angular rotation and rotary bearing a rotary 4 during press molding 4
A horizontal bearing surface 21 for preventing the rotation of the shaft is provided (claim 1).

According to the present invention, the rotary mold 4 has a lower surface 4b (see FIG. 7 and the like) formed in an arc shape in the rotation direction of the rotary mold 4 about the axis P of the rotary mold 4. It is preferable that the lower die 1 includes a support mechanism 11 for supporting the 4b (claim 2).

In this case, since the end of the rotary mold 4 does not need to be supported by a bearing, the end face of the rotary mold 4 can be formed flat. Therefore, the rotary mold 4 can be formed in a long shape by arranging the plurality of rotary molds 4 in series. FIG.
As shown in FIG. 1, since a plurality of rotary molds 4 can be arranged at a predetermined angle, the bending of a bent design can be simplified and facilitated.

In the present invention, as shown in FIGS. 4 to 7, it is preferable that the support mechanism 11 includes a roller 14 for supporting the arc-shaped lower surface 4b of the rotary mold 4 (claim 3).

In this case, the frictional resistance can be reduced, and the rotary mold 4 can be smoothly brought into sliding contact.

In the present invention, as shown in FIGS. 12 and 13, the support mechanism 11 may include an arcuate support surface 30a for supporting the arcuate lower surface 4b of the rotary mold 4. ).

In FIGS. 12 and 13, reference numeral 30 denotes a support member having an arc-shaped support surface 30a corresponding to the arc-shaped lower surface 4b of the rotary mold 4 on the upper surface. 31 is the bearing member 3
Reference numeral 0 denotes a bolt insertion hole for attaching to the main body 1a of the lower mold 1 (see FIG. 1 and the like) using, for example, a hexagon socket head bolt.
Reference numeral 32 denotes a positioning pin hole. in this case,
The rotary mold 4 can be supported by a simple mechanism.

Further, the present invention, as shown in FIG.
A vertical bearing surface 26 is provided on the inner surface of the cavity 2, and includes a rotation preventing member 27 that can freely advance and retreat along the bearing surface 26. May be formed at the position of the side surface 29 to prevent the rotation of the rotary mold 4 (claim 5).

In this case, the rotation of the rotary mold 4 during press forming can be more reliably prevented.

[0016]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1 and the like, reference numeral 1 denotes a lower mold.
Is formed of a main body 1a and an upper molding 1b. Reference numeral 2 denotes a cavity provided in the lower mold 1. The metal plate 3 is set on the upper surface of the forming part 1b disposed on the upper part of the lower die 1.

Reference numeral 4 denotes a rotary mold provided in the cavity 2 so as to be rotatable around a horizontal axis extending in the longitudinal direction. The rotary mold 4 is rotated by a cylinder device 5 to a press forming position during press forming, and to a release position after press forming (see FIG. 2).

The rotary mold 4 has a vertical section perpendicular to the horizontal axis in the longitudinal direction, and is formed in a substantially rectangular cross-sectional shape having a concave fitting portion 4a on the upper surface.
Is formed.

The upper die 6 fits into the holding die 6b for holding the plate 3 between the forming part 1b of the lower die 1 and the concave fitting part 4a of the rotary die 4, and the plate 3 is bent and formed. Molding part 6a
Are formed.

Reference numeral 7 denotes a vertical bearing surface for supporting the rotary mold 4 during press molding, and is formed on a bearing portion 7a protruding from a vertical inner surface of the cavity 2. Reference numeral 8 denotes a horizontal bearing surface for supporting the rotary mold 4 at the time of press molding, and is formed on a bearing portion 8a protruding from the horizontal inner surface of the cavity 2.

The vertical bearing surface 7 is disposed below a horizontal line H passing through the axis P of the rotary mold 4 as shown in FIG. Further, the horizontal bearing surface 8 is positioned at a distance from the vertical line L passing through the axis P of the rotary mold 4 after press molding.
Are arranged at positions closer to the direction of rotation.

Reference numeral 9 denotes a contact surface that comes into contact with the vertical bearing surface 7 of the cavity 2 during press molding. This contact surface 9
Is formed on a contact portion 9a protruding from the side surface of the rotary mold 4 in this embodiment. Reference numeral 10 denotes a horizontal bearing surface 8 formed in the cavity 2 during press molding.
In this embodiment, the contact surface is formed on a contact portion 10 a protruding from the lower surface of the rotary mold 4.

Reference numeral 11 (see FIGS. 3 to 7) denotes a support mechanism for supporting the lower surface of the rotary mold 4. This support mechanism 11
A plurality of lower dies 1 are provided at predetermined intervals. As shown in FIG. 7, the rotary mold 4 has an axial center P at a plurality of positions corresponding to the support mechanism 11 in the longitudinal direction.
And an arc-shaped lower surface 4b formed in an arc shape in the rotation direction of the rotary mold 4. In this embodiment, as shown in FIGS. 7 to 9, the arc-shaped lower surface 4b is formed by fixing the arc-shaped plate 12 to the rotary mold 4 with, for example, hexagonal bolts 13a. 13b
Is a pin for positioning. 13a1 (see FIG. 8) is a bolt insertion hole, and 13b1 is a pin hole.

In this embodiment, as shown in FIGS. 4 to 7, the bearing mechanism 11 is formed of a pair of parallel rollers 14 which abut the arc-shaped lower surface 4b of the rotary mold 4. The pair of rollers 14 has a shaft 15 disposed along the longitudinal direction of the rotary mold 4, and is formed to rotate about the shaft 15. 16 is the axis 1 of the roller 14
It is a holder for supporting 5. This holder 16
Are provided with bolt holes 17 at four corners, and through the bolt holes 17, for example, a hexagonal bolt 18
(See FIG. 7). Reference numeral 19 denotes a fixing pin for fixing the shaft 15 of the roller 14.

As shown in FIGS. 1 and 2, 20 is
It is a rotary pressing member for pressing and rotating the rotary mold 4. The rotary pressing member 20 is slidably mounted on a horizontal sliding surface 2 a provided on the inner surface of the cavity 2 of the lower die 1, and is fixed to the inner surface of the cavity 2. It is connected to the drive shaft 5a of the device 5, and is formed so as to be able to move forward and backward.

As shown in FIG. 1, the upper surface of the front half portion of the rotary die pressing member 20 is brought into contact with the contact surface 22 of the rotary die 4 during press forming, thereby supporting the rotary die 4. It is formed on a horizontal bearing surface 21 so as to prevent the rotation of the rotary mold 4. The contact surface 22 of the rotary die 4 is formed on a contact portion 22a protruding from the lower surface of the rotary die 4, and the rotary die 4 rotates after press forming with respect to a vertical line L passing through the axis P. It is located at a position shifted in the direction opposite to the direction in which it is performed. The upper surface of the rear half of the rotary pressing member 20 has a concave portion 23 adjacent to the horizontal bearing surface 21.
The rear wall forming 3 is formed on the pressing portion 24 of the rotary mold 4.

The pressing portion 24 is for rotating the rotary mold 4 after press forming to separate it from the plate material 3 and is formed slightly higher than the horizontal bearing surface 21.
In addition, the front surface of the upper portion of the pressing portion 24 is formed with an upwardly inclined surface 24a for pressing the contact portion 22a of the rotary mold 4 rearward. On the other hand, the pressing portion 25 for rotating the rotary mold 4 to the press forming position is formed by a corner formed by the horizontal bearing surface 21 and the wall surface of the concave portion 23.
The front surface of the contact portion 22a of the rotary mold 4 against which the pressing portion 25 presses is formed as an inclined surface 22b that is inclined downward toward the cylinder device 5 side.

In FIG. 10, reference numeral 26 denotes a vertical bearing surface. The bearing surface 26 is formed on a bearing 26 a protruding from a vertical inner surface of the cavity 2. The bearing surface 26 is provided with a horizontal line H passing through the axis P of the rotary mold 4.
It is arranged at a position lower than the above.

Reference numeral 27 denotes a rotation preventing member for preventing the rotation of the rotary mold 4. This rotation preventing member 27 is
Cylinder device 2 fixed vertically to the main body 1a
The drive shaft 28a is connected to the drive shaft 28a of the rotary die 8 and is arranged between the support surface 26 and the side surface 29 of the rotary die 4 along the support surface 26 so as to be capable of vertically moving back and forth.

Reference numeral 27a denotes a vertical contact surface of the rotation preventing member 27 which is in sliding contact with the bearing surface 26. Anti-rotation member 2
The surface on the side of the rotary mold 4 of 7 has a vertical bearing surface 27b.
In addition, the upper part is formed on the inclined surface 27c continuous therewith. The inclined surface 27c is inclined so as to move away from the rotary mold 4 as going upward. The lower corner 4c of the rotary mold 4 is chamfered and formed on an inclined surface parallel to the inclined surface 27c. The rotation preventing member 27 is disposed at the position of the side surface 29 of the rotary mold 4 at the time of press molding.
This prevents rotation of.

Next, the operation of the present invention will be described with reference to FIG. 1, FIG. 2, and FIG.

First, the plate material 3 before processing is set in the forming part 1b of the lower die 1. In this state, the upper die 6 descends, and the pressing die portion 6b fixes the plate 3 to the forming portion 1b of the lower die 1. Next, the upper mold part 6a enters the concave fitting part 4a of the rotary mold 4 and bends the plate 3. At this time, the vertical contact surface 9 and the horizontal contact surface 10 of the rotary mold 4 come into surface contact with the vertical bearing surface 7 and the horizontal bearing surface 8 of the cavity 2 respectively, and The applied press pressure is received by the inner surface of the cavity 2 of the lower mold 1. The horizontal contact surface 22 of the rotary mold 4 comes into surface contact with the horizontal bearing surface 21 of the rotary mold pressing member 20 to receive the press pressure applied to the rotary mold 4 and prevent the rotation of the rotary mold 4. Is done. Further, the rotation of the rotary mold 4 is more reliably prevented by the rotation preventing member 27 disposed at the position of the side surface 29 (see FIG. 10) of the rotary mold 4.

When the press forming operation is completed, the forming part 6a and the pressing part 6b of the upper die 6 are separated from the lower die 1. Further, the cylinder device 28 is driven, and the drive shaft 28a is lowered. As a result, the rotation preventing member 27 connected to the drive shaft 28a descends, and the bearing surface 2 of the rotation preventing member 27
7b moves away from the side surface 29 of the rotary mold 4.

Next, as shown in FIG. 2, the cylinder device 5 is driven, and the drive shaft 5a moves forward. As a result, the rotary pressing member 20 connected to the drive shaft 5a moves forward,
The pressing portion 24 of the rotary pressing member 20 is the contact portion 2 of the rotary die 4.
The rear surface of 2a is pressed against and the rotary mold 4 is rotated by a predetermined angle.
As a result, the rotary mold 4 is separated from the plate 3. At this time, the contact portion 22a of the rotary die 4 enters the concave portion 23 of the rotary pressing member 20, and the inclined surface 22b of the contact portion 22a contacts the other pressing portion 25 of the rotary pressing member 20. It is arranged in the state where it did. Further, as shown in FIG. 10, the lower corner 4 c of the rotary mold 4 is disposed to face and separate from the inclined surface 27 c of the rotation preventing member 27.

At the time of press molding, the cylinder device 5 is driven from the state shown in FIG. 2, and the drive shaft 5a is retracted. As a result, the rotary pressing member 20 connected to the drive shaft 5a is retracted, and the pressing portion 25 of the rotary pressing member 20 is moved.
Presses the inclined surface 22b of the contact portion 22a of the rotary mold 4 to rotate the rotary mold 4 by a predetermined angle. As a result, the rotary mold 4 is arranged at the press molding position.

Then, the cylinder device 28 (see FIG. 10) is driven, and the drive shaft 28a is raised. As a result, the rotation preventing member 27 connected to the drive shaft 28a rises and is inserted between the support portion 26a and the rotary mold 4, and the rotation preventing member 27 supports the rotary mold 4.

[0038]

As described above, according to the present invention, a horizontal bearing surface and a vertical bearing surface for supporting a rotary mold at the time of press forming are provided on the inner surface of the cavity of the lower mold. .

Therefore, according to this, not only can the press pressure be received in a stable state, but also the positioning and planar processing of the bearing surface and the rotary contact surface that comes into contact therewith can be simplified and speeded up. Further, maintenance can be facilitated.

Further, according to the present invention, the rotary die is rotated by a predetermined angle by pressing the rotary die by advancing and retracting operation of the drive shaft of the cylinder device. It has a pressing member.

Therefore, in the case of the present invention, at the time of press molding,
Even if a force is applied to the rotary mold from the outside, the rotation of the rotary mold can be prevented, so that press molding can be performed in a stable state with high accuracy.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part during press molding showing a preferred embodiment of the apparatus of the present invention.

FIG. 2 is a vertical cross-sectional view of a main part of the above device at the time of mold release after press molding.

FIG. 3 is a plan view of a main part in which a part of a rotary mold is omitted.

FIG. 4 is a plan view of a support mechanism.

FIG. 5 is a sectional view taken along line VV in FIG. 4;

FIG. 6 is a sectional view taken along the line VI-VI in FIG. 4;

FIG. 7 is a vertical sectional view of a main part of the device of the present invention.

FIG. 8 is a plan view of a plate.

9 is a sectional view taken along line IX-IX in FIG.

FIG. 10 is a longitudinal sectional view of a main part showing a rotation preventing member.

FIG. 11 is a plan view of a main part with a part omitted, showing a connection example of a rotary type.

FIG. 12 is a plan view showing another example of the support mechanism.

13 is a sectional view taken along line XIII-XIII in FIG.

FIG. 14 is a longitudinal sectional view of a main part showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower die 2 Cavity 2a Sliding surface 3 Plate material 4 Rotary die 5 Cylinder device 6 Upper die 7, 8 Bearing surface 9, 10 Contact surface 20 Rotary pressing member 21 Bearing surface 22 Contact surface 24, 25 Press contact Department

Claims (5)

[Claims] 1. A rotary die is rotatably provided in a cavity formed in a lower die, and after pressing a plate material between a lower die and an upper die having the rotary die, the rotary die is removed. In a plate material press forming apparatus configured to separate the rotary mold from the plate material by rotating the rotary mold by a predetermined angle by a cylinder device, a horizontal bearing surface and a vertical bearing surface for supporting the rotary mold during press forming. Are respectively provided on the inner surface of the cavity, and a rotary pressing member connected to a drive shaft of the cylinder device is provided on a sliding surface provided on the inner surface of the cavity. A member is provided with a pressing portion that presses the rotary die by advancing and retracting the drive shaft of the cylinder device to rotate the rotary die by a predetermined angle, and supports the rotary die during press forming and rotates the rotary die. A press forming apparatus for a plate material, comprising a horizontal bearing surface for blocking. 2. The press forming apparatus for a plate material according to claim 1, wherein the rotary mold has a lower surface formed in an arc shape in a rotation direction of the rotary mold about an axis of the rotary mold. A press forming apparatus for a plate material, wherein a lower die is provided with a support mechanism for supporting a lower surface. 3. The press forming apparatus for a plate material according to claim 2, wherein the support mechanism includes a roller for supporting a lower surface of the rotary arc. 4. The apparatus according to claim 2, wherein the support mechanism includes an arc-shaped support surface for supporting the arc-shaped lower surface of the rotary die. 5. The press forming apparatus for a plate material according to claim 1, wherein a vertical bearing surface is provided on an inner surface of said cavity, and is capable of moving forward and backward along said bearing surface. A press forming apparatus for a sheet material, comprising: a rotation preventing member, which is disposed at a side position of the rotary die during press forming to prevent rotation of the rotary die.