JP2000135520A - Press forming die equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent generation of a wrinkle and improve product quality while reducing material cost by providing a concave portion all around the center portion at the middle in the vertical direction of the excess thickness portion with a press die provided with the excess thickness portion from a product portion to a punch profile. SOLUTION: A press die 1 of a press forming die equipment has a product portion 2, an excess thickness portion 3, a punch profile 4 and a blank holder portion 5. The product portion 2 forms the blank into a product shape. The excess thickness portion 3 and a punch profile 4 restrain generation of a wrinkle and give tension to the product. The blank holder portion 5 presses and holds the blank. Even if the wrinkle is remained on the blank of the excess thickness portion 3 in the later period of draw forming, the wrinkle flows into the concave portion 6 of the excess thickness portion and is absorbed and eliminated. In the later period of draw forming, a mode to pull the blank from the product portion 2 into the excess thickness portion 3 occurs, thus reducing the inflow amount of the blank.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press-molding die apparatus for press-forming a material such as an automobile body panel.

[0002]

2. Description of the Related Art In general, a press-formed product of an automobile body panel is manufactured through a press-forming process using a press-molding die apparatus 51 as shown in FIG. This press molding die apparatus 51 includes a blank holder die 53 for pressing and holding a blank (material) 52 and a facing die die 54, and a punch die 55 for forming the blank 52.
And a press die is constituted by the blank holder die 53, the die die 54, and the punch die 55. Such a press molding die apparatus 51
In order to manufacture a body panel for an automobile using FIG.
As shown in (a), first, the blank 52 is placed and set on the upper surfaces of the blank holder mold 53 and the punch mold 55. Next, as shown in FIG.
Is pressed down to press and hold the blank 52 with the blank holder mold 53. Then, as shown in FIG. 7C, the blank 52 is pressed by a punch die 55 to perform drawing. Thereafter, as shown in FIG. 7 (d), the die 54 is moved upward to release it from the blank holder die 53 and the punch die 55, and the blank 52 is taken out from the press forming die device 51. Thus, a product of an automobile body panel is obtained, and the press molding process is completed.

[0003] Incidentally, the press molding die apparatus 51 described above.
In the draw forming by the method, wrinkles are generated in the product, and the wrinkles occur when the movement in the in-plane direction around the blank 52 near the end of the draw forming becomes large, and it is a problem that it does not erase even in the final molded product. Often. Therefore, generally, as shown in FIG. 7, the convex side drawing beads 56 are provided at the corresponding positions of the blank holder mold 53 and the die mold 54.
Further, a concave draw bead 57 is provided, and tension is applied by deformation resistance due to bending back of the blank 52 when passing through the draw beads 57 and 58, thereby suppressing the occurrence of wrinkles.

Further, a method of drawing the blank 52 using press dies 61 and 71 as shown in FIGS. 8 and 9 to improve the formability thereof is also common. The press dies 61, 71 are provided with extra portions 64, 74 from the product portions 62, 72 to the punch profiles 63, 73, respectively. The extra portions 64 of the press dies 61 are formed in a step shape. The surplus portion 74 of the press die 71 is formed in a tapered shape with a certain angle. Here, the surplus portions 64 and 74 are the shapes of the press dies 61 and 71,
In the shape part set other than the shape of the product parts 62 and 72,
The wrinkle holding surface is excluded, and is provided for the purpose of imparting tension to the product, preventing defects such as wrinkles and cracks, and obtaining the flatness of the trim line. 10 (a) to 10 (d) show the widthwise center line (OBL) of the blank 52 when the upper and lower dies 61a and 61b of the press die 61 having the stepped excess portion 64 are drawn. FIG. 10E shows the deformed state of the upper cross section.
Indicates a formed press-formed product 65, and each black dot in the figure indicates an initial position where a predetermined portion of the blank 52 is marked.

[0005]

However, when the press dies 61 and 71 are provided with extra portions 64 and 74, however, an extra material for shaping the shape is required, so that the material yield is low. In addition, the material cost increases.
That is, in the conventional press die 61 shown in FIG. 8, since the surplus portion 64 is formed in a stepped shape, the surplus portion 6
4, the effect of suppressing the wrinkles generated is obtained, but the increase in the line length due to the extra thickness portion 64 is large, the yield of the material is deteriorated, and it is difficult to give the product a tension. However, there is a problem that the bulk is increased and the quality of the product is reduced. Further, in the conventional press die 71 shown in FIG. 9, since the excess portion 74 is formed in a simple taper shape, the increase in the line length due to the excess portion 74 is small, and the yield of the material is good. In addition, the effect of suppressing the wrinkles generated in the excess thickness portion 74 is small, and it is difficult to give the product a tension, so that the quality of the product cannot be improved.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and it is an object of the present invention to suppress wrinkles generated in press-formed products and improve the quality of products while suppressing material costs. The object of the present invention is to provide a simple press molding die apparatus.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems of the prior art, the present invention relates to a press forming metal for forming a material by a press die having a surplus portion extending from a product portion to a punch profile. In the mold device, a concave portion is provided on the entire periphery of a central portion located in the middle of the extra thickness portion in the vertical direction.

The present invention also relates to a press molding die apparatus for molding a material by a press die provided with a surplus portion from a product portion to a punch profile, wherein an upper portion located on the product portion side of the surplus portion is provided. Protrusions are provided all around.

Further, the present invention relates to a press molding die apparatus for forming a material by a press die provided with a surplus portion from a product portion to a punch profile, wherein a plurality of islands are formed on the outer periphery of the surplus portion. The protrusions are provided at intervals apart from the center line in the width direction.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on illustrated embodiments.

FIG. 1 shows a first embodiment of a press molding die apparatus according to the present invention. In the figure, reference numeral 1 denotes a press die of a press-molding die apparatus used in a press-molding step of an automobile body panel (for example, a back door outer panel). The press die 1 includes a product portion 2 for drawing a blank (material) into a product shape of a press-formed product, an excess portion 3 for suppressing generation of wrinkles and giving tension to the product, and a punch profile 4. And a blank holder portion 5 of a wrinkle holding surface for pressing and holding the blank. The product part 2 is located at the center of the front side of the press die 1 and is formed in a convex shape protruding upward.

The excess portion 3 is located around the lower end of the product portion 2 and extends from the product portion 2 to the punch profile 4. For this reason, the excess portion 3 is formed in a tapered shape that is inclined obliquely downward at a certain angle,
A concave portion 6 that absorbs and eliminates wrinkles generated in the material being drawn is provided along the entire circumference at a central portion located in the middle in the vertical direction.

In order to manufacture a press-formed product such as a back door outer panel for an automobile using the press die 1 of the present embodiment, first, as described in detail below, a blank is first formed on the upper surface of the lower die of the press die 1. And set it. Next, the upper die of the press die 1 is pushed down, and the product part 2 and the excess part 3 are pressed while holding the blank between these two dies.
And press forming to perform drawing. At this time, even if wrinkles remain in the blank at the surplus portion 3 in the later stage of the drawing, the wrinkles flow into the concave portion 6 of the surplus portion 3 to absorb and eliminate the wrinkles. Further, in the latter half of the drawing, a mode occurs in which the blank is drawn from the product part 2 side to the surplus part 3 side, so that the amount of the blank flowing in is smaller than in the conventional example. Thereafter, the upper die of the press die 1 is moved upward to release it from the lower die, and the blank is taken out of the press die 1 to obtain a press-formed product such as a back door outer panel for an automobile. Ends.

In the press die 1 of the press molding die apparatus according to the present embodiment, the concave portion 6 is provided along the entire circumference at a central portion located in the middle of the excess thickness portion 3 in the vertical direction. ,
In the latter half of the drawing, even if wrinkles remain in the blank at the portion of the surplus portion 3, the wrinkles can be absorbed and eliminated by the concave portion 6 of the surplus portion 3. Further, in the latter half of the drawing, a mode occurs in which the blank is drawn from the product part 2 side to the surplus part 3 side, and the amount of the blank flowing in is smaller than that of the conventional example, so that the material yield is improved and the product yield is improved. The surface tension can be improved, and the surface quality can be improved and the tension rigidity can be increased. In order to confirm this effect, a wrinkle generated by springback of the press-formed product after release at a portion corresponding to the excess thickness portion 3 is subjected to a comparative inspection with a conventional example, and is formed by the press die 1 of the present embodiment. In the press-formed product, the springback was uniformly reduced from the center line in the width direction to the outside, and no wrinkles remained.

FIGS. 2 and 3 show a second embodiment of the press molding die apparatus according to the present invention. The configuration in which the press die 11 of the present embodiment is different from the press die 1 of the first embodiment is different from the press die 1 of the first embodiment in that a convex portion 12 is provided along the entire circumference at the upper portion of the excess thickness portion 3 located on the product portion 2 side. It is a point that is. Other configurations are the same as those in the first embodiment.
In addition, each black dot in FIG. 3 indicates an initial position marked at a predetermined position of the bill section 13.

In order to manufacture a press-formed product such as a back door outer panel for an automobile using the press die 11 of the present embodiment, first, as shown in FIG. It is placed and set on the upper surface of the mold 11a. Next, as shown in FIGS. 3B and 3C, the upper mold 11b of the press mold 11 is pushed down, and
While pressing and holding the blank 13 between a and 11b, as shown in FIG. 3D, the drawing is performed by applying pressure by the product portion 2 and the excess thickness portion 3. At this time, even if wrinkles remain in the blank 13 at the portion of the surplus portion 3 in the later stage of the drawing, the blank 13 is pulled by the convex portion 12 of the surplus portion 3 so that the wrinkles are absorbed and eliminated. Further, in the latter half of the drawing, a mode occurs in which the blank 13 is drawn from the product part 2 side to the surplus part 3 side, so that the amount of the blank 13 flowing in is smaller than in the conventional example. Thereafter, the upper die 11b of the press die 11 is moved upward to release from the lower die 11a,
If the blank 13 is taken out from the press die 11, FIG.
As shown in (e), a press-formed product 14 such as a back door outer panel for an automobile is obtained, and the press-forming step is completed. Therefore, if press molding is performed using the press die 11 of the press molding die apparatus according to the present embodiment, the same effects as in the first embodiment can be obtained.

FIG. 4 shows a third embodiment of the press mold apparatus according to the present invention. The press die 21 of the present embodiment is different from the press dies 1 and 11 of the first and second embodiments in that a plurality of island-shaped convex portions 22 are provided on the outer periphery of the excess portion 3 in the width direction. The point is that they are arranged with an interval apart from the center line C. Excluding the position on the center line C in the width direction as a position where the island-shaped convex portion 22 is provided, the yield is further improved than that of the conventional case by avoiding the vicinity of the center line C in the width direction where the amount of material flowing in is the largest. That's why. The other configuration and the procedure of the press forming step are the same as those in the first and second embodiments. Therefore, if press molding is performed using the press die 21 of the press molding die apparatus according to the present embodiment, the same effects as those of the first and second embodiments can be obtained.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes are possible based on the technical idea of the present invention. is there. For example, the present invention, as shown in FIG.
A press die 31 provided with a concave ridge portion 32 on the outer periphery of the excess thickness portion 3 except on the center line C in the width direction, or a convex ridge portion 42 on the outer circumference of the excess thickness portion 3 as shown in FIG. It is also possible to apply to the press die 41 provided except on the center line C of the direction. In the excess portions 3 of the press dies 31, 41, the intermediate portion near the center line C in the width direction is formed in a simple taper shape.

[0019]

As described above, the press molding die apparatus according to the present invention is for molding a material by a press die provided with a surplus portion from the product section to the punch profile. Since the concave portion is provided on the entire periphery of the central portion located in the middle in the vertical direction of the portion, it is possible to suppress wrinkles generated in the press-formed product, improve the yield and the product tension, and thereby improve the material Cost and product quality can be improved.

Further, the press molding die apparatus of the present invention comprises:
The material is formed by a press die provided with a surplus portion from the product portion to the punch profile, and since a convex portion is provided on the entire upper periphery located on the product portion side of the surplus portion, Almost the same effects as those of the invention can be obtained.

Further, since the press molding die apparatus of the present invention is used, the material is molded by a press die provided with a surplus portion from the product portion to the punch profile. Since a plurality of island-shaped convex portions are provided at intervals around the outer periphery except for the center line in the width direction, substantially the same effect as the above invention can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a press die of a press-molding die apparatus according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating a press die of a press-molding die apparatus according to a second embodiment of the present invention.

3 (a) to 3 (d) are conceptual diagrams showing a change state of a cross section on a center line in a width direction of a blank when drawing is performed using the press die in FIG. 2, and FIG. It is a conceptual diagram which shows the formed press molded article.

FIG. 4 is a perspective view showing a press die of a press-molding die apparatus according to a third embodiment of the present invention.

FIG. 5 is a perspective view showing a modified example of the press die of the press molding die apparatus according to the embodiment of the present invention.

FIG. 6 is a perspective view showing a further modification of the press die of the press molding die apparatus according to the embodiment of the present invention.

FIGS. 7A to 7D are cross-sectional views illustrating a press forming process using a conventional press forming die apparatus.

FIG. 8 is a cross-sectional view showing a press die of a conventional press molding die apparatus.

FIG. 9 is a cross-sectional view showing a press mold of another conventional press mold apparatus.

10 (a) to 10 (d) are conceptual diagrams showing a change state of a cross section on the center line in the width direction of the blank when drawing is performed using the press die in FIG. 9, and FIG. It is a conceptual diagram which shows the formed press molded article.

[Explanation of symbols]

1,11,21,31,41 Press mold of press mold device 2 Product part 3 Excess part 4 Punch profile 6 Concave part 12 Convex part 13 Blank (material) 14 Press molded product 22 Island-shaped convex part 32 Concave Line 42 Convex line C Center line in width direction

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tomohisa Yamashita 300, Takatsukacho, Hamamatsu-shi, Shizuoka Suzuki Co., Ltd. (72) Inventor Kenichiro Hatono 300, Takatsukacho, Hamamatsu-shi, Shizuoka Suzuki Co., Ltd.

Claims (3)

[Claims] 1. A press molding die apparatus for molding a material by a press die provided with a surplus portion from a product portion to a punch profile, wherein the entire circumference of a central portion located in the middle in the vertical direction of the surplus portion. A press molding die apparatus, characterized in that a concave portion is provided in the mold. 2. A press molding die apparatus for molding a material by a press die having a surplus portion from a product portion to a punch profile. A press molding die apparatus characterized by comprising a part. 3. A press molding die apparatus for molding a material by a press die provided with a surplus portion from a product portion to a punch profile, wherein a plurality of island-shaped convex portions are formed on an outer periphery of the surplus portion by a width. A press molding die apparatus provided with a gap except for a center line in the direction.