JP2528214Y2 - Press forming tool for panel members - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press forming tool for a panel member, and more particularly to a press forming of a panel member formed by laminating and welding two flat plates to obtain a pressed product. For molds.

[0002]

2. Description of the Related Art Conventionally, in order to obtain a press-formed product having different materials and thicknesses depending on parts or to obtain a press-formed product by using waste material, a plurality of press-formed products are disclosed in Japanese Patent Application Laid-Open No. 59-220229. A method is known in which a panel member is obtained by butt-welding the panel member with a laser beam, and then the panel member is press-formed by a press-molding tool comprising a die and a punch.

However, when a plurality of panels are butt-welded as described above, a high degree of relative positioning accuracy between the panels is required, and the end faces of the butt portions must be cut. There is a problem such as not becoming.

[0004] Therefore, it is considered that two flat plates are overlapped and welded to obtain a panel member, and then the panel member is press-formed using a press-forming tool. In this case, it is necessary to form a concave portion corresponding to the shape of the overlapping portion of the panel member on either the die or the punch, but conventionally, the concave portion is formed on a molded product in which less aesthetic appearance is required. Was normal. Therefore, a panel member formed by overlapping and welding two flat plates is press-formed,
When obtaining a molded product having a hat-shaped cross section including a U-shaped portion whose lower side is open and a flange portion extending to both sides from the lower end of the U-shaped portion, the upper surface is flat from an aesthetic point of view. Since it is more preferable, a concave portion is usually provided on the die side.

[0005]

However, when press molding is performed using the above-described mold, the upper surface of the overlapped portion and the upper surface of the other portion are flush with each other, and the upper surface of the molded product becomes flat. On the other hand, a projection is formed on the lower surface of the overlapping portion.

Accordingly, in the case of a molded product having the above-mentioned hat-shaped cross section and the lower surface of the flange portion being joined to another member, a projecting portion projecting downward is formed in the flange portion of the overlapped portion. Therefore, there is a problem that the lower surface of the flange portion does not follow other members in the overlapping portion.

Further, when the panel member is press-formed into a hat-shaped cross section, the tip of the U-shaped portion of the punch first contacts the panel member, and then the side surface of the U-shaped portion of the punch contacts the panel member. When the die is formed with a concave portion corresponding to the protrusion of the U-shaped portion, the protrusion of the U-shaped portion will finally fit into the concave portion of the die, and the panel If there is a misalignment between the overlapping portion of the member and the concave portion of the die, the overlapping portion of the panel member collides with the press-molding tool to cause a defect in the molded product or press molding. There was a problem that the mold was damaged.

Further, when a panel member joined by performing spot welding on an overlapped portion of two flat plates is press-formed to obtain a molded product having a hat-shaped cross section, the panel member is held in a state where the flange portion is sandwiched. In order to squeeze into a U-shape, the area between the spot-welded portion of the U-shaped portion and the spot-welded portion of the flange portion of the panel member is stretched, and the spot-welded portion is subjected to shearing force and the welding is separated. there were.

The present invention solves the above problems at once, and the lower surface of the flange portion in the overlap portion of the molded product having the hat-shaped cross section obtained by press molding is formed flat, and the overlap portion of the panel member is formed. Even if there is a slight misalignment between the press mold and the recess of the press mold, product defects and breakage of the press mold do not occur.Furthermore, if the panel members are joined by spot welding, An object of the present invention is to suppress the elongation between the spot-welded portion of the U-shaped portion and the spot-welded portion of the flange portion so that the spot-welded portion does not separate.

[0010]

In order to achieve the above object, the present invention provides a concave portion corresponding to the flange portion of the overlapping portion on the die side so that the flange portion protrudes toward the die side and the lower surface is formed. By forming a flat portion and providing a concave portion corresponding to the U-shaped portion of the overlapping portion on the punch side, the overlapping portion of the panel member is first fitted with the concave portion of the punch, and the panel member and the press forming die are formed. Is corrected and the spot welded portion of the U-shaped portion and the spot welded portion of the flange portion are not separated.

Specifically, a solution taken by the present invention is to press-mold a panel member formed by laminating and welding two flat plates to form a U-shaped portion having a lower opening and a U-shaped portion. A press-molding tool for a panel member for obtaining a molded product having a hat-shaped cross section composed of a flange portion extending to both sides from a lower end of the panel member and having a lower surface of the flange portion joined to another member. The press forming die for the panel member is composed of a die and a punch, and a die recess is formed in the die corresponding to the shape of the flange portion in the overlapping portion of the molded product. A punch concave portion is formed corresponding to the shape of the U-shaped portion in the portion.

[0012]

According to the above construction, since the die recess is formed in the die corresponding to the shape of the flange portion in the overlapped portion of the molded product, the protrusion of the flange portion in the molded product is formed on the die side, that is, above the flange portion. Therefore, the lower surface of the flange portion becomes flat.

Further, since the punch recess is formed in the punch corresponding to the shape of the U-shaped portion in the overlapping portion of the molded product, a slight displacement occurs between the overlapping portion of the panel member and the punch recess. However, since the overlapping portion of the panel member fits into the punch recess first, slight misalignment is corrected. Further, since the projecting portion of the U-shaped portion of the molded product is formed on the punch side, that is, below the U-shaped portion, the distance between the welded portion of the flange portion and the welded portion of the U-shaped portion is elongated. Is suppressed.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic overall view of a molded product 1 made of a pillar reinforcement of an automobile body. The molded product 1 is formed by stacking two flat plates, and spot welding is performed on the overlapped portion. The panel members joined by performing are pressed by a panel member press-molding tool according to one embodiment of the present invention. The molded article 1 has a hat-shaped cross section including a U-shaped portion 3 having an open lower side and a flange portion 5 extending to both sides from the lower end of the U-shaped portion 3. Is joined to another member (not shown). Note that, in the figure, reference numeral 7 denotes an overlapping portion.

FIG. 2 shows a cross-sectional structure of a portion corresponding to the overlapping portion 7 of the molded product 1 in the press-molding tool of the panel member. The press-molding tool is composed of a die 10 arranged on the upper side and held by elevating means (not shown), and a punch 14 fixed to the base 12 below the die 10. A cavity having a hat-shaped cross section is formed that includes a U-shaped portion whose lower side is open and a flange portion extending to both sides from the lower end of the U-shaped portion. On both sides of the punch 14, the blank holder 1 supported on the base 12 so as to be movable up and down.
6, the blank holder 16 descends while the panel member A is sandwiched as the die 10 descends.

As shown in FIGS. 2 and 3, a feature of the present embodiment is that the shape of the projecting portion of the flange portion 5 of the overlapping portion 7 is provided at a portion of the die 10 corresponding to the overlapping portion 7 of the molded product 1. And a punch corresponding to the shape of the projecting portion of the U-shaped portion 3 of the overlapped portion 7 is formed in a portion of the punch 14 corresponding to the overlapped portion 7 of the molded product 1. A recess 14a is formed.

Therefore, the die 10 and the punch 14
In the case of press-molding using a die, first, the overlapping portion of the panel member A is fitted into the upper portion 14b of the punch concave portion 14a, and then the side portion 14c of the punch concave portion 14a is formed with the relative approach between the die 10 and the punch 14. The overlapping portion of the panel member A is fitted. Therefore, in the last push-off state of the die 10, the overlapping portion of the panel member A is securely fitted in the punch recess 14a.

FIG. 4 shows an enlarged structure near the overlapping portion 7 of the molded article 1 obtained by press molding using the die 10 and the punch 14, and FIG. 5 is a cross-sectional view taken along line VV in FIG. Shows the structure. As is clear from FIGS. 4 and 5,
The protruding portion 5a of the flange portion 5 in the overlapping portion 7 is formed on the die side, that is, on the upper side, and the lower surface of the flange portion 5 is flat. The protruding portion 3a of the U-shaped portion 3 in the overlapping portion 7 is formed on the punch side, that is, on the lower side, and is hidden inside in appearance.

Further, since the projection 5a of the flange portion 5 in the overlapping portion 7 is formed on the upper side and the projection 3a of the U-shaped portion 6 is formed on the lower side, the spot welding portion of the flange portion 5 is formed. Since the elongation between 5b and the spot-welded portion 3b of the U-shaped portion 3 is suppressed, the shearing force applied to the spot-welded portions 5b, 3b is reduced and the spot-welded portions 5b, 3b are difficult to separate.

[0021]

As described above, according to the press-molding die for a panel member according to the present invention, a die recess is formed in the die corresponding to the shape of the flange portion at the overlapping portion of the molded product, and the punch is formed. Since the punch concave portion was formed corresponding to the shape of the U-shaped portion in the overlapping portion of the molded product, the lower surface of the flange portion of the overlapping portion became flat, and the overlapping portion of the panel member and the punch concave portion Even if there is a slight misalignment between them, the misalignment is corrected, so that there is no failure of the molded product or breakage of the press-molding tool, and if the panel members are joined by spot welding, The elongation between the spot-welded portion of the U-shaped portion and the spot-welded portion of the flange portion is suppressed, and the spot-welded portion is difficult to separate.

[Brief description of the drawings]

FIG. 1 is a perspective view of a molded product obtained by a panel member press-molding tool according to an embodiment of the present invention.

FIG. 2 is a sectional view of a press-molding tool for the panel member.

FIG. 3 is a cross-sectional perspective view of a die and a punch constituting the press-molding tool of the panel member.

FIG. 4 is an enlarged sectional perspective view of a part of a molded product obtained by the press molding tool of the panel member.

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

[Explanation of symbols]

 A: Panel member 1: Molded product 3: U-shaped portion 3a: Projection 3b: Spot weld 5: Flange 5a: Projection 5b: Spot weld 7: Overlapping portion 10: Die 10a: Die recess 14 ... Punch 14a ... Punch recess

Claims (1)

(57) [Scope of request for utility model registration] 1. A panel member formed by laminating and welding two flat plates to form a U-shaped portion having a lower side opening and a flange portion extending to both sides from a lower end of the U-shaped portion. A press-molding tool for a panel member for obtaining a molded product having a hat-shaped cross section and a lower surface of the flange portion to be joined to another member, comprising a die and a punch. A die recess is formed corresponding to the shape of the flange portion in the overlapping portion of the molded product, and the punch has a punch recess corresponding to the shape of the U-shaped portion in the overlapping portion of the molded product. A press-molding tool for a panel member, which is formed.