JPH09308923A - Formation of width expansion of sheet member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simultaneously save and lighten a material by continuously forming U-shaped slits over a prescribed length of a flay plate blank, stretching the blank in the direction vertical tot the U-shaped slits so as to expand the width. SOLUTION: A cross member 11 is the one formed into flanges 18, 18 by vending both sides of the part corresponding to a web after expanding the width of U-shaped parts 12'a between the slits forming U-shaped slits 13, 13... and 14, 14... in a perform in the direction vertical to the slits 13, 13... and 14, 14.... The formation of the flanges 18, 18 are executed by a width-expanding and bending mechanism. By this method, the width expansion forming method which can save the material and reduce the wt., is obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for widening a plate member suitable for forming a cross member of a vehicle frame.

[0002]

2. Description of the Related Art A pair of left and right side frames and a cross member for connecting the side frames, which constitute the vehicle frame, both have a web at the center of a vertically long plate material, and both sides are bent to form a flange. Many of them are formed into a channel shape, and at this time, it is usual that the side frame and the cross member are joined together by rivets, with both flanges being upside down.

In this case, in particular, since the web of the cross member has a lower internal stress generated at the time of loading as compared with the flange, the web 2 of the cross member 1 is relatively large as shown in FIGS. Drilling a round hole 3 is performed. As shown in FIG. 5, the round hole 3 is formed by forming an outer shape 4 on a vertically long flat plate material 1'of a cross member and forming a round hole 3 in a central portion which becomes a web 2 after molding. The semi-finished product is web 2 in the center as shown in FIG.
The flanges 5 and 5 are formed by bending both sides while leaving.

However, in the cross member 1,
Although the weight reduction of the product can be achieved, the weight of the raw material does not decrease, and the price of the scrap removed as the round hole 3 is generally low, which makes it difficult to save the material cost.

[0005]

SUMMARY OF THE INVENTION Therefore, the problem to be solved by the present invention is to provide a method for widening a plate member capable of saving the material and reducing the weight not only in the product but also in the material stage. Especially.

[0006]

In order to solve the above-mentioned problems, the present invention forms a U-shaped slit continuously over a predetermined length of a flat plate material, and then forms such a plate into the U-shaped slit. Invention relating to a widening forming method of a plate member in which the width is expanded by pulling in a direction perpendicular to the rectangular slit, and a U-shaped slit is continuously formed over a predetermined length of the flat plate material. The second invention relates to a widening forming method for a channel-shaped plate member, in which a flat plate is pulled in a direction perpendicular to the U-shaped slit to widen it, and then bent to be formed into a channel shape.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described in detail with reference to FIGS. 1 to 4 using a cross member as a plate member as an example. FIG. 1 shows a portion 12 'corresponding to a web in a vertically long flat plate material 11' for a cross member according to the present invention.
U-shaped slits 13, 13, ... And 1 over the entire length of
It is a perspective view showing a state in which 4, 14, ... Are continuously punched out, but in this example, a U-shaped slit 13,
, ... and 14, 14, ... are symmetrical with a cross-shaped slit 15 formed at the center in the longitudinal direction, and the lower end portions of the respective “U” s of the U-shaped slits 13 and 14 are outward. It is formed to face. Positioning portions 13a and 14a are formed at both ends of each "U" of the U-shaped slits 13 and 14 when the width is widened later. In addition, 1
Reference numeral 6 indicates an outer shape taken by press working.

FIG. 2 shows a perspective view of the cross member 11 of the present invention. The cross member 11 has U-shaped slits 13, 13, ... And 1 in the blank 17 shown in FIG.
U-shaped portions 12'a between the slits forming 4, 14, ...
, And 14, 14 and so on in a direction perpendicular to the slits 13, and then the both sides of the web-corresponding portion 12 'are bent to form flanges 18, 18. In the cross member 11, the U-shaped slits 13 and 14 formed in the web 12 have a shallow U-shape or a wavy shape.

The widening of the U-shaped portion 12'a between the slits 13 and 14 and the formation of the flanges 18 and 18 are performed by the widening / folding mechanism shown in FIGS. That is, the mechanism includes a die 21 having a groove-shaped recess 21a fixed to the lower die of a press machine (not shown), and the die 2
The pad 23 is fixed to the upper end of a cushion pin 22 that extends through the bottom 21b of the No. 1 and extends into the recess 21a, and a guide hole 23a is formed in which a pilot pin 25 of a punch 24, which will be described later, is inserted and which can be moved in the left-right direction. When,
It is held together with a punch holder 26, which will be described later, in an upper die (not shown) of the press, and is provided with pilot pins 25, 25 at its lower portion.
4a and a set of punches 24 and slide slopes 24a, 24 of the punches 24 fixed to the upper die of the press.
The punch holder 26 is formed with a tapered surface 26a that is fitted between a and a.

When the blank 17 is formed by the widening / bending mechanism as described above, first, the pad 23 is formed.
By means of the cushion pin 22.
3, the upper surface of the pad 23 is kept flush with the upper end of the die 21 as shown in FIG. 3, and in this state, the blank 17 is placed at a predetermined position on the die 21 and the pad 23. .

Next, the upper die of the press machine is lowered to punch 2
4 on the semi-finished product 17, and at the same time pilot pin 2
5, 25 are the U-shaped slits 1 in the semi-finished product 17
Inserted into the respective positioning portions 13a and 14a of Nos. 3 and 14 and the guide holes 23a and 23a of the pad 23. At this time, the punch holder 26 is kept at an upper position so as not to apply a widening force to the punch 24 as shown in the left half of FIG. Therefore, the pilot pin 25
Is the guide hole 2 of the pad 23 as shown in the left half of FIG.
It is located closest to the cushion pin 22 of 3a.

Here, the punch holder 26 is lowered as shown in the right half of FIG. 3 while the pad 23 is kept at the position, or the cushion pin 22 is raised while the punch holder 26 is fixed at the upper position. In this case, the pilot pin 25 is connected to the pad 2 as in the right half of FIG.
3 is moved to the position farthest from the cushion pin 22 of the guide hole 23a of No. 3, and the U-shaped slit 1 of the semi-finished product 17
The U-shaped portion 12'a between the slits forming 3, 13, ... And 14, 14, ... Is widened.

When the upper die of the press is lowered in this state, the upper portion 24b of the punch 24 is pushed by the lower surface 26b of the punch holder 26 and the sliding of the punch 24 in the lateral direction is stopped, and the cushion pin 22, Pad 23 and semi-finished product 17
4 is pushed downward, the semi-finished product 17 thus widened is bent at both sides of the upper part 12 to form the flanges 18, 18 as shown in FIG. The upper die of the press machine is lifted to remove the punch 24 and the punch holder 26 from the cross member 11 that has been molded, and the cushion pin 2
If 2 is raised, it can be taken out from the die 21.

[0014]

According to the first aspect of the present invention, a U-shaped slit is continuously formed over a predetermined length of a flat plate material, and such a plate is stretched in a direction perpendicular to the U-shaped slit. Since the width is enlarged by forming the continuous U-shaped slits at locations where strength is not required in the plate member, material saving is achieved in the plate member or the decorative plate, etc. to which a large force is not applied. And there is an effect that the weight can be reduced at the same time. In the second aspect of the present invention, a U-shaped slit is continuously formed over a predetermined length of a flat plate material, and then such a plate is pulled in a direction perpendicular to the U-shaped slit. After widening, it is bent and molded into a channel shape, so there is an effect that material saving and weight reduction can be achieved in the same manner as described above, and a channel-shaped plate member such as a cross member is
There is also an effect that it can have a freshness in design different from the conventional round hole.

[Brief description of drawings]

FIG. 1 is a perspective view showing a semi-finished product of a cross member corresponding to a plate member according to the present invention.

FIG. 2 is a perspective view of a cross member as a channel plate member according to the present invention.

FIG. 3 is a cross-sectional view of a widening / bending mechanism required for carrying out the molding method of the present invention, showing before widening in the left half of FIG. 3 and after widening in the right half of FIG.

FIG. 4 is a cross-sectional view of a widening / bending mechanism required for carrying out the molding method of the present invention, showing a state in which a flange is formed by bending after widening.

FIG. 5 is a perspective view showing a semi-finished product of a conventional cross member.

FIG. 6 is a perspective view of a conventional cross member.

[Explanation of symbols]

 1, 11 Cross member-1 ', 11' Flat plate material 2, 12 Cross member web 12 'Web equivalent part 3 Round hole 4, 16 Outer shape 5, 18 Cross member flange 13, 14 U-shaped slit 15 Cross-shaped slit 17 Semi-finished product 21 Die 21a Groove-shaped recess 22 Cushion pin 23 Pad 23a Guide hole 24 Punch 24a Sliding slope 25 Pilot pin 26 Punch holder 26a Tapered surface.

Claims (2)

[Claims] 1. A U-shaped slit is continuously formed over a predetermined length of a flat plate material, and then such a plate is stretched in a direction perpendicular to the U-shaped slit to expand the width. A method for widening a plate member, characterized by: 2. A U-shaped slit is continuously formed over a predetermined length of a flat plate material, and then such a plate is stretched in a direction perpendicular to the U-shaped slit to widen the plate, and A method for widening a channel-shaped plate member, which comprises bending a sheet to form a channel.