JP2004291005A - Press working method, drawing die therefor, and formed product thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a press working method by which a press drawing die can be used in common and the yield of material is not deteriorated in the press working for a plurality of drawn-formed products different only in width directional size, and to provide a drawing die used for the method and a formed product thereof. <P>SOLUTION: A pressing blank (steel plate 10) is disposed on a blank holder (3) and a lower die (2) by laying in the whole range of a holding surface (h) of the blank holder (3) in the vertical (Y) direction so as not to lay in the whole range of the holding surface (h) of the blank holder (3) in the width (X) direction. When the pressing blank (10) held with an upper die (2) and the blank holder (3), is pressed with the lower die (2), a projection (5) for blank flowing-in resistance is allowed to abut on a position corresponding to a flat portion (f) of the drawing formed product in the pressing blank (10), and the press working is performed by constituting so that the pressing with the projection (5) for blank flowing-in resistance becomes the flowing-in resistance of the pressing blank (10). <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a plurality of drawn products having only flat portions that differ in the width direction, and to a press working method, a drawing die for the working, and a formed product obtained by the working method.
[0002]
[Prior art]
Conventionally, for press forming of a plurality of drawn products that differ only in the width direction, prepare different drawing dies, or use a common drawing die to use a common drawing shape and set the shear position. The molding process has been performed either by changing the width dimension to cope with the difference.
However, in such a forming method, the former requires draw dies, and the latter has a problem that the material yield is poor because the wide part is formed, and an excess portion is cut and discarded.
[0003]
Hereinafter, a more specific description will be given of an example of forming a body floor part of an automobile.
In FIG. 8, reference numeral 11A denotes a drawn product, in which the X axis is the width direction, the Y axis is the vertical direction, and the Z axis is the vertical direction. The left part in the figure shown by the symbol f is a flat part (in the cross section in the width direction), the whole is L part, and the M part and the part c are sheared at the position shown by the symbol b and discarded on the left side. The S part is sheared at the position shown and discarded on the left side. That is, the three parts L, M, and S are formed by forming a common press material (steel plate) with a common drawing die, and the parts M and S are products with low material yields.
[0004]
In the case of forming a plurality of products that differ only in the width dimension as described above, if the product is a mass-produced product, the problem of material yield can be solved by preparing and forming a drawing die for each product. In addition, in order to improve the yield by previously forming a press material to an appropriate size and using a common drawing die to improve the yield, the following wrinkle suppressing problem occurs.
[0005]
That is, in drawing, as shown in FIG. 9, the blank 10 is placed on the entire area of the hold surface h of the blank holder 3, and the blank 10 is held by the upper mold 1B and the blank holder 3 to hold the blank 10. And press for molding. Therefore, when an appropriate-sized material is placed on the M or S part using the mold for the L part, the material cannot be placed on the entire hold surface h, and a portion where wrinkle pressing is not performed at the time of pressurization is performed. Cannot flow into the mold and cannot be formed into a desired shape.
[0006]
As a similar prior art, Patent Document 1 discloses a method in which a positioning flange portion is integrally formed when a vehicle body panel serving as an outer panel component is press-formed, and a vehicle body is assembled using the positioning flange portion. .
[0007]
[Patent Document 1]
JP-A-8-20369
[Problems to be solved by the invention]
The present invention has been proposed in order to address the above-described problems, and in press forming a plurality of drawn products having only a difference in width dimension, a press drawing die is commonly used, and the material yield is deteriorated. An object of the present invention is to provide a press working method, a drawing die used for the forming work, and a molded product thereof.
[0009]
[Means for Solving the Problems]
The press working method of the present invention is directed to a press working method for forming a plurality of press-formed products (L, M, S) that differ only in the dimension in the width (X) direction of the flat portion (f). ) Is placed on the entire area of the hold surface (h) of the wrinkle holder (3) in the direction, and is mounted on the entire area of the hold surface (h) of the wrinkle holder (3) in the width (X) direction. The press material (steel plate: 10) is placed on the wrinkle retainer (3) and the lower die (2) so as not to be placed, and is held by the upper die (2) and the wrinkle retainer (3). When the (steel plate: 10) is pressed by the lower die (2), the protrusion (5) for material inflow resistance formed on the lower die (2) is flattened by a drawn material in a pressed material (steel plate: 10). The lower die (2) Press forming by pressing the press material (steel plate: 10) from both sides with the resistance projections (5) and the upper die (1) so as to be the inflow resistance of the press material (steel plate: 10) (Claim 1: First Embodiment).
[0010]
Alternatively, in a press working method for forming a plurality of draw-formed products (L, M, S) each having a different dimension only in the width (X) direction of the flat portion (f), a press material (steel plate: 10) It is placed on the entire area of the hold surface (h) of the wrinkle holder (3) in the vertical (Y) direction, and on the entire area of the hold surface (h) of the wrinkle holder (3) in the width (X) direction. The press material (steel plate: 10) held by the upper die (1A) and the wrinkle holder (3) is placed on the wrinkle holder (3) and the lower die (2A) without being placed. When pressed by the mold (2A), the material inflow resistance projections (7) protrude from the upper mold (1A), and the material inflow resistance projections (7) are connected to the drawn material of the pressed material (steel plate: 10). Abut on the position corresponding to the flat part (f), and ) And the lower mold (2A) presses the press material (steel plate: 10) from both sides so as to be the inflow resistance of the press material (steel plate: 10). And press working (claim 2: second embodiment).
[0011]
When projecting the material inflow resistance projection (7) from the upper mold (1A), a pressurized fluid is supplied to and protruded from the material inflow resistance projection housing portion (9) of the upper mold (1A). 3: Second embodiment).
[0012]
The lower die for press working (2) of the present invention is the same as the lower die for draw forming (2) used in the press working method of claim 1, wherein a projection (5) for material inflow resistance is formed. The material inflow resistance projection (5) is formed at a position corresponding to the flat portion (f) of the drawn product in the press material (steel plate: 10), and is held by the upper mold (1) and the wrinkle retainer (3). When the press material (steel plate: 10) is pressed by the lower mold (2), the press material (steel plate: 10) is pressed from both sides together with the upper mold (1) to prevent the inflow resistance of the press material (steel plate: 10). (Claim 4: Lower die used in the first embodiment).
[0013]
The upper die (1A) for press working according to the present invention is the upper die (1A) for draw forming used in the press working method according to any one of claims 2 and 3, and is used as the upper die (1A). And (3) a material inflow resistance projection (7) configured to protrude when the pressed material (steel plate: 10) is pressed by the lower mold (2A). The projection (7) is formed at a position corresponding to the flat portion (f) of the drawn product in the press material (steel plate: 10), and presses the press material (steel plate: 10) from both sides together with the lower mold (2A). It is characterized in that it is configured to have an inflow resistance of a press material (steel plate: 10) (Claim 5: an upper die used in the second embodiment).
[0014]
Further, a material inflow resistance projection housing portion (9) for accommodating the material inflow resistance projection (7) is formed, and the material is used to project the material inflow resistance projection (7) toward the lower mold (2A) side. A pressure fluid supply system (20) for supplying a pressure fluid to the inflow resistance protrusion accommodating portion (9) is provided (claim 6: an upper die used in the second embodiment).
[0015]
A press-formed product according to the present invention is a drawn product (11) formed by the press working method according to any one of claims 1 to 3, wherein the flat portion (f) has a longitudinal (Y) direction. An extending protrusion (16) is formed, and the protrusion (16) is characterized in that it has a shape complementary to the material inflow resistance protrusion (5) formed on the press die (1, 2). (Claim 7: First and Second Embodiments).
[0016]
The present invention is configured as described above, and a protrusion for material inflow resistance is provided on the upper die or the lower die at a position corresponding to the flat part of the molded product, and the part is first pressed when pressed. As a result, the material flows into the drawing die and is prevented from flowing into the drawing die.
Therefore, it can be used for a material whose flat part has a different width dimension and the entire surface cannot be held by wrinkle holding, and a molded article having only a different width dimension can be press-formed with a common drawing die. It is possible.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 shows an example of a press-formed product of a floor part 11 of an automobile body according to a first embodiment of the present invention. The left side of the drawing in the width direction (X direction) is a flat portion f, and the flat portion f is provided with a bead (projection) 16 extending upward in the vertical direction (Y direction). The whole is an L component.
[0018]
FIG. 2 shows a cross section in the width direction after the press working, and further, the width direction is sheared at a position indicated by reference character a, and a wrinkle holding portion is removed to obtain a product.
FIGS. 3 and 4 show an M part and an S part having a shorter width than the L part. The drawing shape is the same as that of the L part. As will be described later, it is formed by using a narrow material 10A. Are sheared after press working at positions indicated by reference numerals b and c, respectively, to obtain a product.
[0019]
FIG. 5 and FIG. 6 show respective cross sections in the longitudinal direction and the width direction of a drawing die for press-molding these molded products L, M, and S. Reference numeral 1 denotes an upper die, reference numeral 2 denotes a lower die, and reference numeral 3 denotes This shows wrinkle control.
In FIG. 6, the left side of the drawing in the width direction corresponds to the formation of a flat portion f of the molded product, on which a material inflow resistance projection 5 extending vertically in the lower mold 2 is provided in a protruding manner. A groove 6 complementary to the protrusion 5 is formed in the upper mold 1.
[0020]
With this configuration, when forming the M component and the S component, a material 10A having an appropriate dimension in the width direction is used for both the M component and a part of the flat portion f is formed on the holding surface h of the wrinkle retainer 3. If the press forming is performed in a state where the material is not placed, first, the protrusion 5 comes into contact with the material 10A, and this portion serves as a resistance, thereby preventing the material from flowing. Then, by performing shearing at the positions b and c, products of the M and S parts are obtained.
[0021]
FIG. 7 shows a second embodiment. This embodiment is different from the first embodiment in the configuration of the protrusion for material inflow resistance. That is, the lower die 2A is provided with a groove 8 at a position corresponding to the flat portion f, and a material inflow resistance projection accommodating portion 9 is provided at a position opposite to the upper die 1A so that a material inflow protrusion is provided inside the lower die 2A. The piece 7 is slidably inserted in the vertical direction, and the projecting piece 7 is made to project during press working so as to become a projection. The pressure supply device 20 supplies a pressurized fluid (for example, hydraulic pressure) from a pressure source for projecting the projecting piece 7.
[0022]
As described above, when pressurized fluid is first supplied to the raw material inflow resistance projection receiving point 9 during press forming, the protruding piece 7 abuts on the raw material 11 and becomes an inflow resistance to prevent the inflow thereof. The material 11A having a small width can be used, and the material yield can be improved.
[0023]
【The invention's effect】
The present invention is configured as described above and has the following effects.
(1) The press forming of a plurality of drawn products differing only in the width direction can be performed using a common drawing die, and can be performed without deteriorating the material yield.
(2) Since the product has protrusions (beads) at the flat edges, the rigidity is improved.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a press-formed product according to the present invention.
FIG. 2 is a cross-sectional view in the width direction of the L component in FIG. 1;
FIG. 3 is a sectional view in the width direction of the M part in FIG. 1;
FIG. 4 is a sectional view in the width direction of the S component in FIG. 1;
FIG. 5 is a longitudinal sectional view showing a first embodiment of an upper and lower die for press working of the present invention.
FIG. 6 is a sectional view in the width direction of FIG. 5;
FIG. 7 is a cross-sectional view in the width direction showing a second embodiment of the upper and lower dies for press working of the present invention.
FIG. 8 is a perspective view showing an example of a conventional press-formed product.
FIG. 9 is a view for explaining press molding of the molded article of FIG. 8;
[Explanation of symbols]
1, 1A, 1B ... upper mold 2, 2A, 2B ... lower mold 3 ... wrinkle holder 5 ... protrusion for material inflow resistance (lower mold side)
7 Projection for material inflow resistance (upper die side)
9: Protrusion income point for material inflow resistance 10, 10A: Press material 11: Press molded product

Claims (7)

In a press working method for forming a plurality of draw-formed products, each of which differs only in a width direction dimension of a flat portion, in a vertical direction, the flat portion is placed on an entire area of a hold surface of a wrinkle holder, and in a width direction, The press material is placed on the wrinkle retainer and the lower mold so that the press material is not placed on the entire area of the hold surface of the wrinkle retainer, and the press material held by the upper mold and the wrinkle retainer is pressed by the lower mold. When pressing, the material inflow resistance protrusion formed on the lower mold is brought into contact with a position corresponding to the flat portion of the drawn material in the press material, and the lower mold inflow resistance protrusion and the upper mold are pressed together. A press working method characterized in that press working is carried out by configuring so that the location where the material is pressed from both sides is the resistance to the inflow of the press material. In a press working method for forming a plurality of draw-formed products, each of which differs only in a width direction dimension of a flat portion, a press material is placed on an entire area of a hold surface of a wrinkle holder in a vertical direction, and For the wrinkle retainer, the press material held by the wrinkle retainer is placed on the wrinkle retainer and the lower mold so as not to be placed on the entire area of the hold surface of the wrinkle retainer, and is pressed by the lower mold. At this time, the material inflow resistance projection protrudes from the upper mold, and the material inflow resistance projection abuts on a position corresponding to a flat portion of the drawn product in the press material, and the material inflow resistance projection protrudes from the upper mold. A press working method characterized in that the press working is carried out by configuring a portion where the press die and the lower die press the press material from both sides so as to have an inflow resistance of the press material. 3. The press working method according to claim 2, wherein when projecting the material inflow resistance projection from the upper mold, a pressurized fluid is supplied to the material inflow resistance projection accommodating portion of the upper mold and made to protrude. 2. A draw mold lower die used in the press working method according to claim 1, wherein a material inflow resistance protrusion is formed, and the material inflow resistance protrusion corresponds to a flat portion of the drawn material in the press material. When the press material held by the upper die and the wrinkle retainer is pressed by the lower die, the press material is pressed together with the upper die from both sides to provide inflow resistance of the press material. A lower die for press working, characterized in that: An upper die for drawing according to any one of claims 2 and 3, wherein the press material held by the upper die and the wrinkle retainer is protruded when pressed by the lower die. The material inflow resistance projection is formed at a position corresponding to the flat portion of the drawn product in the press material, and presses the press material together with the lower mold from both sides to reduce the inflow resistance of the press material. An upper die for press working, characterized in that it is configured to be A pressure fluid for supplying a pressurized fluid to the material inflow resistance projection accommodating portion for projecting the material inflow resistance projection to the lower mold side, wherein a material inflow resistance projection accommodating portion for accommodating the material inflow resistance projection is formed. The upper die for press working according to claim 5, further comprising a supply system. A drawn product formed by the press working method according to any one of claims 1 to 3, wherein a protrusion extending in a vertical direction is formed on a flat portion, and the protrusion is formed on a press die. A drawn molded product having a shape complementary to the formed material inflow resistance projection.

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