JP2009106961A - Press forming method and press forming die - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a press forming method by which a first formed article having an opening part and a second formed article which is smaller than the opening part are formed in the same process and a press forming die which is used therefor. <P>SOLUTION: First, in a base stock blanking stage, the base stock is cut along the outer periphery of the first formed article 5 and also the base stock 9 is flattened as leaving the punching of the opening part of the first formed article 5. After that, in a drawing stage, projecting and recessing parts of the first formed article 5, the second formed article 6 and a third formed article 7 are formed on the base stock 9 and, simultaneously, the first formed article 5, the second formed article 6 and the third formed article 7 are fractured separably. By continuously performing the base stock blanking stage and the drawing stage, the first formed article 5 having the opening part, the second formed article 6 and the third formed article 7 which are smaller than the opening part in the size are formed simultaneously. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a press molding method for molding a plurality of molded products in the same process and a press mold used at that time.

  A panel constituting a body of an automobile or the like is formed through a plurality of processes such as cutting and pressing. Among them, in a panel having an opening by deep drawing, for example, a side outer panel having a door opening or a door inner panel having a window opening, an opening is provided in the material in advance before deep drawing.

  FIG. 6 is a schematic view schematically showing a molding process of the side outer panel. When processing the side outer panel into a predetermined uneven shape, first, as shown in FIG. 6A, the material is cut into the size of the side outer panel and two openings 100 are formed. Thus, the first material 101 having the opening 100 and the second and third materials 102 and 103 obtained by forming each opening 100 are obtained. Next, deep drawing is performed using the first material 101 using a side outer panel molding die. Thereby, the side outer panel 105 which has the opening part 104 used as a door opening part and predetermined unevenness | corrugation can be obtained. Before and after this deep drawing, the end material obtained by cutting the region to be the door opening from the material, that is, the second and third materials 102 and 103 are used as the material for the component panel and pressed. . Thereby, the parts 106 and 107 which have a predetermined unevenness | corrugation can be obtained.

  By the way, various press apparatuses and molds used for molding various panels of automobiles have been developed. For example, in the press forming mold for drawing and drawing disclosed in Patent Document 1, a workpiece is cut in the middle of a press stroke. The cut workpiece can be drawn. In the press working apparatus disclosed in Patent Literature 2, the edge of the panel work, the bending of the flange, and the drawing can be processed with the same press die.

Japanese Patent Laid-Open No. 7-241626 Japanese Patent Laid-Open No. 10-5884

  In the conventional processing step described with reference to FIG. 6, for example, a side outer panel and various small parts are formed through a material cutting step and a plurality of pressing steps. Therefore, in addition to the mold for the side outer panel, a mold for small parts is also required. The same applies when molding door window panels instead of side outer panels.

  Therefore, in the conventional method, a molding die is prepared for each part, and there are many processing steps, and the processing cost increases. In addition, there are problems in terms of mold production cost and logistics.

  In view of the above problems, the present invention provides a press molding method capable of molding a first molded product having an opening and a second molded product smaller than the opening in the same process, and a press mold used for the method. The purpose is to provide.

  The press molding method in the present invention is a press molding method for simultaneously molding a first molded product having an opening and a second molded product having a smaller dimension than the opening in a series of steps in order to achieve the above object. The material is sandwiched between the upper pad in the first upper mold and the first lower mold, and the material is outside by the upper outer peripheral cutting edge provided in the first upper mold and the lower outer peripheral cutting edge provided in the first lower mold. At the same time as cutting along the entire circumference, the upper inner peripheral cutting edge provided in the first upper mold and the lower inner peripheral cutting edge provided in the first lower mold are processed to the point before completely cutting the material, and thereafter By bending back the material sandwiched between the first upper pad and the first lower mold with the lower pad provided on the first lower mold so as to face the upper inner peripheral cutting edge of the first upper mold, The material removal step for flattening, the material is sandwiched between the second upper mold and the second lower mold cushion ring, and the second upper mold and the second lower mold Forming the concave and convex portions of the first molded product and the second molded product on the mold surface, and at the same time forming the material so that the inner side of the material is broken along the inner periphery and can be separated into the first molded product and the second molded product. It is a feature.

  In order to achieve the above object, the press mold in the present invention is used when molding a first molded product having an opening and a second molded product having a size smaller than the opening. A pair of press molds, wherein the upper mold is provided with upper and outer peripheral cutting edges corresponding to the outer periphery of the first molded product, and the upper mold is configured to correspond to the opening of the first molded product. The upper inner peripheral cutting edge is provided, the lower mold is provided with a lower outer peripheral cutting edge so as to face the upper outer peripheral cutting edge corresponding to the outer peripheral edge of the first molded product, and the lower mold is provided with the first molded product of the first molded product. The lower inner peripheral cutting edge is provided so as to face the upper inner peripheral cutting edge in correspondence with the opening, and the upper pad is provided so that the upper pad applies pressure in the downward direction at a position facing the lower inner peripheral cutting edge. In the lower mold, a lower pad is provided at a position facing the upper inner peripheral cutting edge so as to apply an upward pressure. Preferably, the upper mold includes a pressure source that applies a downward force to the upper pad, and the lower mold includes a pressure source that applies an upward force to the lower pad.

  According to the press molding method of the present invention, the material is cut along the outer periphery of the first molded product in the material removal step, and the material is flattened by leaving the opening of the first molded product, and then the drawing step. By performing deep-drawing, the unevenness of the first molded product and the second molded product can be formed, and at the same time, the first molded product and the second molded product can be separated so as to be separable. Therefore, the first molded product having the opening and the second molded product having a smaller dimension than the opening can be simultaneously molded in a series of steps.

  According to the press molding die of the present invention, in the material removal step in the molding method of the present invention, the material is flattened by cutting along the outer periphery of the first molded product and leaving the opening of the first molded product. The material can be molded.

  In the press molding method of the present invention using the press mold of the present invention, the number of processing steps required for molding two or more molded products is smaller than that of the conventional method. Moreover, it is not necessary to prepare a mold for each part. Therefore, the number of processing steps does not increase and the processing cost does not increase.

  Below, as a preferred embodiment, a side outer panel will be described as a first molded product having an opening. That is, description will be made on the assumption that a first molded product having two openings and second and third molded products having smaller dimensions than the opening of the first molded product are produced.

  In the press molding method according to the present embodiment, separate molds are used in the blanking process and the drawing process. Hereinafter, each mold will be described. FIG. 1 is a diagram schematically illustrating a press mold according to the embodiment. As shown in FIG. 1, the press material blanking die 1 used in the material blanking step is composed of an upper die 10 and a lower die 20.

  The upper die 10 and the lower die 20 are provided with an upper outer peripheral cutting blade 11 and upper inner peripheral cutting blades 12 and 13 so that a lower outer peripheral cutting blade 21 and lower inner peripheral cutting blades 22 and 23 face each other. Specifically, the upper mold 10 is provided with an upper outer peripheral cutting edge 11 at a position corresponding to the outer peripheral edge of the first molded product, and the first mold 10 is positioned at a position corresponding to one opening of the first molded product. The upper inner peripheral cutting edge 12 is provided, and the second upper inner peripheral cutting edge 13 is provided at a position corresponding to the other opening of the first molded product. A lower outer peripheral cutting edge 21 is provided in the lower mold 20 so as to correspond to the upper mold 10 so as to face the upper outer peripheral cutting edge 11 at a position corresponding to the outer peripheral edge of the first molded article. A first lower inner peripheral cutting edge 22 is provided so as to face the first upper inner peripheral cutting edge 12 at a position corresponding to one opening, and the first lower inner peripheral cutting edge 22 is positioned at a position corresponding to the other opening. A second lower inner peripheral cutting edge 23 is provided so as to face the two upper inner peripheral cutting edges 13.

  An upper pad 14 is provided on the upper mold 10. Specifically, the upper pad 14 has a shape surrounding each of the first upper inner peripheral cutting edge 12 and the second upper inner peripheral cutting edge 13, and the upper pad 14 has the first upper inner peripheral edge. It is attached along the outer peripheral edge of the cutting edge 12 and the outer peripheral edge of the second upper inner peripheral cutting edge 13. Therefore, the upper pad 14 faces the first lower inner peripheral cutting edge 22 and the second lower inner peripheral cutting edge 23. The upper mold 10 is provided with a pad 10 </ b> A at a position facing the lower outer peripheral cutting edge 21 of the lower mold 20.

  Pressure sources 17, 18, and 19 are embedded in the upper mold 10 on the back side of the upper pad 14, that is, on the side opposite to the surface in contact with the material. As the pressure sources 17 to 19, for example, gas springs, coil springs, urethane springs, or the like can be used. The pressure sources 17, 18, and 19 are disposed so as to contact the back surface of the upper pad 14, respectively, and generate a downward pressure on the upper pad 14.

  The lower mold 20 is provided with lower pads 24 and 25. That is, the lower die 20 is provided with a first lower pad 24 along the inside of the first lower inner peripheral cutting edge 22, and a second lower pad 25 is provided inside the second lower inner peripheral cutting edge 23. It is provided along. The first lower pad 24 faces the first upper inner peripheral cutting edge 12, and the second lower pad 25 faces the second upper inner peripheral cutting edge 13.

  In the lower mold 20, a fourth pressure source 26 and a fifth pressure source 27 are embedded on the back side of the first lower pad 24 and the second lower pad 25, that is, on the side opposite to the surface in contact with the material, respectively. Yes. As the fourth and fifth pressure sources 26 and 27, for example, a gas spring, a coil spring, a urethane spring, or the like can be used. The pressure sources 26 and 27 are disposed so as to contact the back surfaces of the first and second lower pads 26 and 27, respectively, and the pressure sources 26 and 27 apply upward pressure to the lower pads 24 and 25.

  Further, in the upper mold 10, the upper pad 14 is pushed by the first to third pressure sources 17, 18, 19 and is lower than the first and second upper inner peripheral cutting edges 12, 13. Protrudes to the side.

  Moreover, the surface on which the material is placed in the lower mold 20 does not protrude and is a flat surface.

  FIG. 2 is a diagram schematically showing a molding die used in the drawing process in the press molding method according to the embodiment. FIG. 2A is a drawing product in which the second molded product and the third molded product are normal drawn products, For example, a forming die in the case of a drawing product required for a blank is shown, and (B) shows a forming die in a case where the second and third forming products are stamping drawing products, that is, drawing products that do not require a blank. Is shown.

The mold 2 shown in FIG. 2 (A) will be described.
The mold 2 is composed of an upper mold 30 and a lower mold 40 in a pair of upper and lower sides. The upper mold 30 includes a first upper molding surface 31 having a recess so as to be a deep drawing shape of the first molded product, and a second upper molding surface 32 having a recess so as to be a deep drawing shape of the second molded product. And a third upper molding surface 33 having a recess so as to have a deep-drawn shape of the third molded product. The lower mold 40 includes a first lower molding surface 41 having a projection corresponding to the first upper molding surface 31, a second lower molding surface 42 having a projection corresponding to the second upper molding surface 32, A third lower molding surface 43 having protrusions corresponding to the three upper molding surfaces 33. In the case shown in the figure, the lower mold 40 moves relative to the upper mold 30 to mold the workpiece, so that the lower mold 40 faces the upper mold 30 except for the first to third lower molding surfaces. Cushion rings 44, 45 and 46 are provided on the side.

The mold 3 shown in FIG. 2 (B) will be described.
The molding die 3 in the stamping drawn product is composed of an upper die 50 and a lower die 60 in a pair of upper and lower sides. The upper mold 50 includes a first upper molding surface 51 having a recess so as to be a deep drawing shape of the first molded product, a second upper molding surface 52 corresponding to the shape of the second molded product, and a third molded product. And a third upper molding surface 53 corresponding to the shape. The lower mold 60 includes a lower molding surface 61 having a protrusion corresponding to the first upper molding surface 51. Since the lower mold 60 moves relative to the upper mold 50 to form the workpiece, the lower mold 60 includes a first cushion ring 64 outside the first lower molding surface 61, and a second upper mold 60. A second cushion ring 62 is provided at a position corresponding to the molding surface 52, and a third cushion ring 63 is provided at a position corresponding to the third molding surface.

  FIG. 3 is a cross-sectional view schematically showing a material extracting step of the press forming method according to the embodiment, and FIG. 4 is a cross-sectional view schematically showing a drawing forming step of the press forming method. FIG. 5 is a schematic diagram partially showing a process in the case of producing a side outer panel as the first molded product 5 and a small part as the second and third molded products 6 and 7. Unlike the conventional flow shown in FIG. 6, the press molding method according to the present embodiment performs deep drawing on a material in a state where the region to be the opening of the first molded product 5 is not separated from the material. This will be specifically described below.

  In the press molding method according to the embodiment, the raw material 8 is cut so as to have a predetermined outer dimension as a raw material removing step, and the raw material 9 is produced. The material removal process will be specifically described. A material blanking die 1 shown in FIG. 1 is used, and a material 8 is disposed between an upper die 10 and a lower die 20. Next, the space between the upper die 10 and the lower die 20 is narrowed, the material 8 is sandwiched between the pad 10A of the upper die 10 and the lower outer peripheral cutting edge 21 of the lower die 20, and the upper outer peripheral cutting blade 11 and the lower die 20 are The distance between the upper mold 10 and the lower mold 20 is further narrowed so that the lower outer peripheral cutting edge 21 of the mold 20 bites. Then, the outer peripheral portion 9A of the material 9 is formed. At this time, the first upper inner peripheral edge 12 of the upper mold 10 and the first lower inner peripheral edge 22 of the lower mold 20 bite into the material 8, but they have not yet completely sheared, and the upper mold The 10 second upper inner peripheral blades 13 and the second lower inner peripheral blade 23 of the lower mold 20 bite into the material 8, but have not yet completely sheared the material 8. That is, as shown in FIGS. 3A to 3B, the material 8 is pushed downward by the upper inner peripheral cutting edge 12, but the material 8 is connected to the material parts 8a and 8b. is there.

  Thereafter, as the upper die 10 is raised, a force is applied to the lower die 30 side by the first to third pressure sources 17, 18, 19 with respect to the material 8 b held by the upper pad 14, so The lower pad 24 is pressurized by the fourth pressure source 27 to the upper mold 20 side, and the second lower pad 25 of the lower mold 30 is pressed by the fifth pressure source 28 to the upper mold 20 side. Then, the first and second lower pads 24 and 25 are pushed back to flatten the material 8.

  The material 9 can be produced from the material 8 by the above material removal process. As shown in FIG. 5 (A), the material 9 forms the outer peripheral line 9A of the first molded product 5 but is not completely cut as the first molded product 5 and is not cut in the drawing process described below. A cut is generated in the portion 9B serving as a peripheral line.

  Next, as a drawing process, the material 9 is placed between the upper mold 30 and the lower mold 40 in the mold 2 shown in FIG. , 6 and 7 are produced. The drawing process will be specifically described. Using the molding die 2 shown in FIG. 2A, the material 9 that has undergone the material removal step is disposed between the upper die 30 and the lower die 40. Next, the material 9 is sandwiched between the cushion rings 44, 45 and 46 of the upper mold 30 and the lower mold 40. Thereafter, by moving the lower mold 40 to the upper mold 30, the projections on the mold surface of the lower mold 40 enter into the depressions on the mold surface of the upper mold 30, and the material 9 is deep-drawn. At that time, as shown in FIG. 4, the material 9 forms a notch between the portion to be the first molded product 5 and the portion to be the second molded product 6 and the third molded product 7 in the material removal step. Therefore, it breaks by deep drawing. Therefore, the first to third molded articles are separated from each other. Thereafter, the outer peripheral portions of the first to third molded products 5, 6 and 7 and the opening of the first molded product 5 are processed to complete the molded products 5 to 7.

  In the above description, the case of the mold 2 shown in FIG. 2A has been described, but the drawing process can be performed in the same manner also in the case of the mold 3 shown in FIG. In other words, the material 9 that has been subjected to the material removal step is disposed between the upper die 50 and the lower die 60 in the molding die 3, and the first to third molded products can be manufactured through deep drawing.

  Moreover, although the case where the side outer panel and the small part of the vehicle are molded at the same time has been described, the present invention can be similarly applied even when the first molded product having the opening is the door inner panel. Moreover, although the case where the first molded article has two openings has been described, the present invention can be similarly applied regardless of whether the number of openings is one or three or more. Needless to say, the present invention is not limited to vehicle parts. According to the press molding method of the present invention, the number of processing steps required for molding two or more molded products is less than that of the conventional method shown in FIG. 6, and a plurality of molded products can be produced in a series of steps. Therefore, the present invention is not limited to the above embodiment, and can be implemented with appropriate modifications within the scope of the invention.

It is a figure which shows typically the shaping | molding die concerning embodiment of this invention. In the press molding method which concerns on embodiment, it is a figure which shows typically the shaping | molding die used at a drawing process, (A) is shaping | molding in case a 2nd molded product and a 3rd molded product are normal draw molded products (B) shows a mold when the second molded product and the third molded product are stamped drawing molded products. It is sectional drawing which shows typically the raw material extraction process of the press molding method which concerns on embodiment. It is sectional drawing which shows typically the drawing process of this press molding method. It is a schematic diagram which shows partially about the process in the case of shape | molding the side outer panel as a 1st molded product, and the small components as a 2nd and 3rd molded product. It is a figure which shows typically the conventional formation process of a side outer panel.

Explanation of symbols

1: Material punching die 2, 3: Drawing die 1, 2, 3: Molding die 5, 6, 7: Molded product 5A: Inner peripheral line 8, 9: Material 9A: Outer peripheral line 9B: Parts 10, 30, 50 : Upper die 11: Upper outer peripheral cutting edge 12, 13: Upper inner peripheral cutting blade 10A, 14: Pads 17, 18, 19, 26, 27: Pressure source 20, 40, 60: Lower die 21: Lower outer peripheral cutting blade 22 23: Lower inner peripheral cutting edges 31, 32, 33, 51, 52, 53: Upper molding surfaces 41, 42, 43, 61: Lower molding surfaces 44, 45, 46, 62, 63, 64: Cushion rings

Claims (3)

A press molding method of simultaneously molding a first molded product having an opening and a second molded product having a smaller dimension than the opening in a series of steps,
A material is sandwiched between the upper pad in the first upper mold and the first lower mold, and the upper outer peripheral cutting edge provided in the first upper mold and the lower outer peripheral cutting edge provided in the first lower mold The material is cut along the entire outer periphery, and at the same time, the material is completely cut by the upper inner peripheral cutting edge provided in the first upper die and the lower inner peripheral cutting edge provided in the first lower die. The first upper pad and the first lower mold are processed by a lower pad provided on the first lower mold so as to face the upper inner peripheral cutting edge of the first upper mold. By bending back the material sandwiched between, the material removal process to flatten,
The material is sandwiched between the second upper mold and the second lower mold cushion ring, and the unevenness of the first molded product and the second molded product is formed on each mold surface of the second upper mold and the second lower mold. A press molding method in which molding is performed so that the inner side of the material breaks along the inner periphery at the same time as molding and can be separated into a first molded product and a second molded product. A press molding die that is used when molding a first molded product having an opening and a second molded product having a smaller dimension than the opening, and is composed of a pair of an upper die and a lower die,
The upper mold is provided with an upper outer peripheral cutting edge corresponding to the outer peripheral edge of the first molded product,
The upper mold is provided with an upper inner peripheral cutting edge corresponding to the opening of the first molded product,
The lower mold is provided with a lower outer peripheral cutting edge so as to face the upper outer peripheral cutting edge corresponding to the outer peripheral edge of the first molded product,
The lower mold is provided with a lower inner peripheral cutting edge so as to face the upper inner peripheral cutting edge corresponding to the opening of the first molded product,
The upper die is provided so that an upper pad applies pressure in a downward direction at a position facing the lower inner peripheral cutting edge,
A press molding die in which a lower pad is provided on the lower die so as to apply a pressure in an upward direction at a position facing the upper inner peripheral cutting edge.   The press molding according to claim 2, wherein a pressure source that applies a downward force to the upper pad is built in the upper mold, and a pressure source that applies an upward force to the lower pad is built in the lower mold. Type.

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