JPH0523761A - Flange forming die - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention has a central flange connected to a central wall portion,
The horizontal mold that connects to the side wall part is made with the same mold 1
The purpose is to enable molding in the process. [Structure] In the present invention, the blank material in the expanded shape of the product is first connected to the central flange connected to the central wall portion and the side wall flange by the cooperation of the pad / side wall sectional die and the flange sectional die. The sideways flange is bent. During this processing,
The punch moves in the direction of approaching the first mold. And
Subsequently, when the second mold body approaches the first mold body, the second elastic body contracts, and the side wall section is bent by the cooperation of the side wall sectioning die and the punch. .. In this way, since the center flange and the lateral flange are bent in one step, the processing quality will be good.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention forms a panel material having a central wall portion and both side wall portions integrally formed on both sides of the central wall portion and having a substantially U-shaped cross section. TECHNICAL FIELD The present invention relates to a flange-molding die in which a flange part is molded into a flange part.

[0002]

2. Description of the Related Art Among various panel products constituting an automobile body, as shown in FIGS. 5 (A) and 5 (B), a central wall portion 11 and both side wall portions integrated on both sides thereof are formed. 12, 1
3 has a U-shaped cross section, a central flange Fc is formed at the end of the central portion 11, and both side wall portions 12,
13 includes lateral flanges Fe1 and Fe2, respectively. Further, the side flanges Fs1 and Fs are provided on the side portions of the respective side wall portions 12 and 13, respectively.
s2 is formed. In order to form a panel product having such a shape, first, as shown in FIG. 6A, a blank material cutting press (not shown) is used to cut a blank material W having a developed shape. After that, it is press-formed into the shape shown in FIG. Conventionally, a blank material formed into an expanded shape as shown in FIG. 6 (A) is first formed into a substantially U-shaped cross section as shown in FIG. 6 (B) by using a press die not shown. At the same time as molding, the central flange Fc is bent. Then, the panel material W formed in such a shape
Is conveyed to another cam flange type, where the lateral flanges Fe1 and Fe2 are bent from the solid line state to the two-dot chain line state.

[0003]

However, in such a conventional processing method, after the blank material W in the expanded shape is bent including the central flange Fc, the lateral flanges Fe1 and Fe2 are formed by another cam flange type. Since it is bent, two steps are required for bending the product, and the number of steps is increasing. Further, since the work after the first bending is completed is conveyed to the cam flange type, the center flange Fc and the lateral flanges Fe1 and Fe2 may have variations in processing accuracy. Since these flanges are joined to other panel materials, if these flanges have variations in processing accuracy with each other, a desired joined state cannot be obtained.

Therefore, as described above, the present invention has a central wall portion and both side wall portions, and has a substantially U-shaped cross section.
A product in which a central flange is formed on the central wall portion and lateral flanges are formed on both side wall portions can be bent in one step from a blank material so that a high quality product can be formed. To aim.

[0005]

SUMMARY OF THE INVENTION To achieve the above object, the present invention provides a central wall portion having a central flange formed at an end portion by bending a blank material having a developed product, and an end portion. A flange forming mold for forming a product having a U-shaped cross-section having a side wall portion formed with a lateral flange, wherein the second mold body is relatively moved toward and away from the first mold body. A punch that is movably installed and has a molding surface corresponding to the U-shaped cross section of the product is provided in the first mold,
On the other hand, a side wall sectional die that is movably mounted in the approaching / separating movement direction and that bends the side wall portion with respect to the central wall portion in cooperation with the punch is attached to the second mold body. At the same time, a pad for sandwiching the central wall portion of the blank material with the punch is attached to the second mold so as to be movable in the approaching / separating movement direction with respect to the pad, and the central flange and the lateral flange. A sectional die for a flange for bending is attached to the first die body, a first elastic body is mounted between the first die body and the punch, and the second die body and the pad are attached. A second elastic body is mounted between the two elastic bodies, the elastic force of the second elastic body is set to be larger than the elastic force of the first elastic body, and the punch is moved by being pressed by the pad. The chromatography click a flanging die which is formed by longer than the dimension of the flange.

[0006]

In the blank material having the developed product, the central flange and the lateral flange are first bent by the cooperation of the sectional die for pad and side wall and the sectional die for flange. At the time of this processing, the punch moves backward toward the first mold. And then the second
When the mold body approaches the first mold body, the second elastic body contracts, and the side wall section is bent with respect to the central part by the cooperation of the side wall sectioning die and the punch. In this way, since the center flange and the lateral flange are bent in one step, the processing quality of these is improved.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A flange forming mold according to an embodiment shown in the drawings will be described in detail below. As shown in FIG. 1, the flange forming die 20 includes a bolster 21 as a first die body and an upper body as a second die body that moves up and down with respect to the bolster 21 so as to be movable toward and away from the bolster. And a holder 22. The bolster 2 as the first mold body
On the other hand, a punch 23 is attached to the apparatus 1 so as to be movable in a vertical direction, that is, in the approaching / separating movement direction by a predetermined stroke. This punch, as shown in FIG.
The first molding surface 2 corresponding to the inner surface of the central wall portion 11 of the final product
4 and two second walls corresponding to the inner surfaces of the side wall portions 12 and 13
The molding surface 25 and the molding surface 25 have a U-shaped cross section. A third molding surface 26 for molding the side flanges Fs1 and Fs2 is formed from the lower end of the second molding surface 25.

In the upper holder 22 as the second mold body, both side wall portions 12 and 13 of the blank W are bent with respect to the central wall portion 11 in cooperation with the punch 23, and both side wall portions are bent. Side flange F for 12 and 13
Sectional die 2 for side wall that bends s1 and Fs2
7 is attached. Further, a pad 28 for sandwiching the blank material W between the upper holder 22 and the molding surface 24 of the punch 23 is attached to the upper holder 22 so as to be vertically movable. As shown in FIG. 2, a flange sectional die 30 is attached to the bolster 21 adjacent to the end face of the punch 23. This sectional die 30 cooperates with the pad 28 to
This is for bending the central flange Fc and the lateral flanges Fe1 and Fe2.

Between the punch 23 and the bolster 21,
The first elastic body 31 is mounted, and the elastic force in the direction toward the upper holder 22 is applied to the punch 23 by the first elastic body 31. When the punch 23 is not machined by the first elastic body 31, the punch 23 is raised to a position where the first molding surface 24 thereof is substantially flush with the upper surface of the flange sectional die 30 or higher than it. The lower limit position of the punch 23 is regulated by the lower end surface of the punch 23 contacting a stopper surface 21a formed on the bolster 21. The moving stroke SL of this is shown in FIG.
As shown in, the width is set longer than the width dimension L of the lateral flanges Fe1 and Fe2 plus the plate thickness.

Between the pad 28 and the upper holder 22,
The second elastic body 32 is attached, and the elastic force in the direction toward the bolster 21 is applied to the pad 28 by the second elastic body 32. When not processed by the second elastic body 32, the lower surface of the pad 28 is formed by the sidewall sectioning die 2
It moves with respect to the upper holder 22 to a position on the same plane as the lower surface of 7 or below the lower surface. The elastic force of the second elastic body 32, that is, the spring force P2 is set to be larger than the elastic force P1 of the first elastic body. That is, P1 <P2
Has become. Therefore, by lowering the upper holder 22, which is the upper mold body, to move the blank material W
After the pad 28 contacts the punch 23 through the punch 23, the punch 23 is first pushed down by the subsequent downward movement. As a result, the center flange Fc and the two laterally oriented flanges Fe1 and Fe2 are bent by the flange sectioning die 30. When the upper holder 22 is further moved downward, the second elastic body 32 contracts and the side wall sectional die 27 projects from the pad 28. By the cooperation of the die 27 and the punch 23, the side wall portions 12 and 13 and the side wall portions. The flanges Fs1 and Fs2 are bent. Therefore,
Moving stroke S with respect to the upper holder 22 of the pad 28
U corresponds to the depth of the product, that is, the width dimension H of the side wall portions 12 and 13 shown in FIG. As shown in FIG. 2, a locating pin 33 that fits into a positioning hole formed in the blank W is projected on the first molding surface 24 of the punch 23, and the pad 28 is made to correspond to this pin 33.
A housing hole 34 is formed in the housing.

Next, the procedure for molding a product using the above-mentioned flange molding die 20 will be described with reference to FIG. As shown in FIG. 6A, a blank material W having a shape in which a product is developed is formed in advance in a blank material forming step, and the blank material W is placed on the punch 23. This state is shown in FIG. At this time, the upper holder 22 is in the upper limit position and is sufficiently separated from the bolster 21. When the upper holder 21 is moved downward in this state, the elastic force of the first elastic body 31 is smaller than the elastic force of the second elastic body 32,
First, by the cooperation of the pad 28, the side wall sectional die 27, and the flange sectional die 30, the central flange Fc and the two laterally oriented flanges Fe1 and Fe2 are connected to each other as shown in FIG.
It is bent as shown in FIG. The processing of these flanges is completed when the lower surface of the punch 23 contacts the stopper surface 21a.

Subsequently, when the upper holder 22 is moved down, the side wall sectional die 27 moves down with the second elastic body 32 contracting and the pad 28 holding the blank material W by the punch 23. As a result, due to the cooperation of the side wall sectioning die 27 and the second and third molding surfaces 25, 26 of the punch 23, as shown in FIG. And the side wall flanges Fs1 and Fs2 are bent to the side wall portions 12 and 13, respectively. A state in which these processes are completed is as shown in FIG. When the processing is completed, as shown in FIG. 4, in addition to the central portion 11, the side wall portions 12 and 13, the respective flanges Fc, Fe1, Fe2, Fs1 and Fs2 have the same molding shown in FIG. 1 and FIG. It is bent by the mold 20. As described above, according to the forming die shown in the drawing, the side walls 12 and 13 and the flange can be bent at the same time by the same forming die, so that the processing accuracy of the flange is improved, It has become possible to mold high quality products.

Incidentally, in the case shown in the drawing, as shown in FIG. 5 (A), the above-mentioned flanges Fc, Fe1 and Fe2 are formed by bending only one end portion in the longitudinal direction of the product.
The present invention can also be applied to the case where the respective flanges are bent and formed at both ends. Further, in the case shown in the figure, the side flanges Fs1 and Fs2 are formed on the side wall portions 12 and 13, but the present invention can be applied to products without these flanges. Also,
The vertical relationship between the first mold 21 and the second mold is set to be opposite, and the first mold is vertically movable above the second mold fixed to the lower side.
A mold may be provided.

[0014]

As described above, according to the present invention, the central wall portion and the side wall portion bent to the central wall portion have a substantially U-shaped cross section, and the central wall portion and the side wall portion are flanged. A product having these flanges displaced in the right-angled direction in the same plane can be bent by one molding die, and the flanges can be formed by two steps by separate molding dies as in the past. As compared with the case of molding, not only the molding efficiency was improved, but also the molding accuracy was improved.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing a flange forming mold according to an embodiment of the present invention,

FIG. 2 is a sectional view taken along the line BB in FIG.

FIG. 3 is a perspective view showing a molding procedure by the mold shown in FIGS. 1 and 2.

FIG. 4 is a perspective view showing a part of the finished product,

FIG. 5 (A) is a perspective view showing a finished product,
(B) is a sectional view of FIG.

FIG. 6A is a plan view showing a blank material in a state where a product is developed, and FIG. 6B is a perspective view showing a conventional flange forming process.

[Explanation of symbols]

11 ... Central wall part, 12, 13 ... Side wall part, 21 ... Bolster (first mold), 22 ... Upper holder (second mold), 23
... Punch, 24, 25, 26 ... Molding surface, 27 ... Side wall sectional die, 28 ... Pad, 30 ... Flange sectional die, 31 ... First elastic body, 32 ... Second elastic body, 33 ... Locating pin, Fc … Center flange, Fe1,
Fe2 ... Horizontal flange, W ... Blank material.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location B21D 53/86 A 6689-4E

Claims (1)

Claim: What is claimed is: 1. A blank material having an expanded product shape is bent to form a central wall portion having a central flange formed at an end portion, and a side wall portion having a lateral flange formed at the end portion. A flange forming mold for forming a product having a U-shaped cross section having a second mold body relatively movably installed toward and away from the first mold body. A punch having a molding surface corresponding to a U-shaped cross-section is mounted on the first mold so as to be movable in the approaching / separating movement direction, and the side wall portion is formed in the center by cooperating with the punch. A side wall sectional die for bending the wall portion is attached to the second die body, and a pad for sandwiching the central wall portion of the blank material with the punch is attached to the second die. Direction A flange sectional die that is movably mounted and that bends the central flange and the lateral flange is attached to the first mold body, and a first elastic body is provided between the first mold body and the punch. The second mold between the second mold body and the pad.
The elastic body is mounted, the elastic force of the second elastic body is set to be larger than the elastic force of the first elastic body, and the movement stroke of the punch moved by being pressed by the pad is the width of the lateral flange. A flange forming mold that is set longer than the dimensions.