JP2019025509A - Manufacturing method of press moulding - Google Patents

Abstract

An object of the present invention is to more reliably avoid an out-of-plane stretch flange crack expected when forming a flange by bending out of a plane. The present invention relates to a press molding manufacturing method for forming a target molded product having a flange with an out-of-plane deformed portion (F) partially deformed out of plane along a plate edge in a part of the flange. Filled portions Y are formed on both sides or one side of the largest stretched flange deformed portion P of the out-of-plane deformed portions F, and each of the filled portions Y has two or more uneven portions protruding in one direction in the plate thickness direction. The protrusion amount of the remaining proximal uneven portion Y1 is higher on the contact surface 10A side than the distal uneven portion Y2 farthest from the maximum stretch flange deformed portion P. [Selection diagram] Fig. 4

Description

The present invention relates to a technology for press-molding a metal plate on a press-formed product having a flange, and in particular, when a flange is bent out of plane and press-formed, the edge of the plate is cracked at a portion extending out of the plane and deforming the flange. The present invention relates to a technique for avoiding (stretch flange cracking).
Here, examples of the flange include a vertical wall portion in a press-formed product having a U-shaped cross section, a plate edge portion that is continuous with a vertical wall portion in a cross-sectional hat shape via a bent portion, and the like.

In the production of press-formed products by press molding, molding defects due to cracks are an important problem. In recent years, the cracks at the squeezing deformation part and the overhanging deformation part have decreased due to the improvement of the simulation analysis accuracy, but the press cracks (elongated flange cracks) due to the material edge have become conspicuous, which is a problem. And the technique for avoiding this stretch flange crack has been proposed conventionally.
For example, in the invention described in Patent Document 1, it is proposed to avoid stretch flange cracking by changing the blank shape.
Further, Patent Document 2 proposes avoiding stretch flange cracking by pre-forming pre-formed portions on both sides or one side of the maximum stretch flange deformed portion.

WO2014 / 185428 Japanese Patent No. 5979164

In patent document 1, it is necessary to design a blank so that the overhang | projection part for avoiding a flange crack may be provided separately from the target blank shape.
On the other hand, in the method of Patent Document 2, there is no need to change the blank shape, but there is room for improvement.
The present invention has been made paying attention to the above points, and an object thereof is to more reliably avoid stretch flange cracks.

The present inventor has examined the formation of the preliminary deformed portion as described in Patent Document 2, and by devising the shape of the preliminary deformed portion, the stretch flange crack at the maximum stretch flange deformed portion can be more reliably ensured. I learned that it would be possible to avoid it.
In order to solve the problem based on such knowledge, one aspect of the present invention is a press-molded product having an out-of-plane deformed portion in which a contour along a plate edge is deformed out of plane on a part of a flange by bending. A method for manufacturing a press-formed product for press-molding a metal plate, wherein the pre-mesh is formed by deforming the plate edge positions on both sides or one side of the maximum stretch flange deformed portion of the out-of-plane deformed portions in the plate thickness direction. And a flange forming step of forming a flange having an out-of-plane deformed portion by bending the metal plate portion that becomes the out-of-plane deformed portion out of the plane after forming the pre-formed portion. And the pre-mesh portion is composed of two or more uneven portions arranged along the outline of the plate edge and projecting to one side in the plate thickness direction, and the two or more uneven portions. Of these, the uneven part furthest away from the maximum stretch flange deformed part It is called the distal concavo-convex part, the remaining concavo-convex part is called the proximal concavo-convex part, the surface side of the metal plate facing away from the direction bent by the bending process is called the contact surface, and further in the plate thickness direction When the protrusion amount is defined to be higher as the protrusion amount toward the contact surface side is larger, the protrusion amount of the proximal uneven portion is higher than the protrusion amount of the distal uneven portion. Features.

In another aspect of the present invention, a press-molded product for press-molding a metal plate to a press-molded product having an out-of-plane deformed portion whose contour along the plate edge is deformed out of plane on a part of the flange by bending. It is a manufacturing method, and a pre-wall portion forming step for forming a pre-wall portion formed by deforming the plate edge positions on both sides or one side of the maximum stretch flange deformation portion among the out-of-plane deformation portions, A flange forming step of forming a flange having an out-of-plane deformed portion by bending a metal plate portion serving as the out-of-plane deformed portion after forming the pre-formed portion; , Which is composed of two or more concavo-convex portions arranged along the outline of the plate edge and each protruding in one of the plate thickness directions,
Of the two or more concavo-convex portions, when the concavo-convex portion furthest from the maximum stretch flange deformed portion is called a distal concavo-convex portion and the remaining concavo-convex portions are called proximal concavo-convex portions, In the bending process, the distal concavo-convex part is characterized in that the start of deformation to flattening is slower than the proximal concavo-convex part.

  According to one aspect of the present invention, it is possible to more reliably avoid stretch flange cracks in a flange portion that is deformed out of plane by bending.

It is a figure which shows the example of the press molded product which can apply this embodiment. It is a figure explaining the example of the process process which concerns on embodiment based on this invention. It is a figure which shows the process of a deformation | transformation of a board. It is the conceptual diagram seen from the board end surface side expand | deployed along the board edge in order to demonstrate the shape of a pre-mesh part. It is a top view explaining the die | dye used at a pre-metal part formation process. It is a conceptual diagram explaining the metal mold | die used at the pre-mesh part formation process. It is a conceptual diagram explaining the metal mold | die used at the last shaping | molding process. It is the conceptual diagram seen from the board end surface side expand | deployed along the board edge in order to demonstrate the shape of the pre-mesh part in a comparative example. It is the conceptual diagram seen from the board end surface side expand | deployed along the board edge in order to demonstrate the modification of a pre-mesh part.

Next, embodiments of the present invention will be described with reference to the drawings.
The technical idea of the present invention does not specify the material, shape, structure, etc. of the component parts as follows. The technical idea of the present invention can be variously modified within the technical scope defined by the claims described in the claims.
In general, it is known that when press molding is performed, moldability is improved by forming a desired molded product shape (press molded product) by multi-stage molding. This is because distortion is less likely to concentrate in one place and can be dispersed throughout, when the molding is performed in multiple stages than when molding into the final shape with a single press.
However, the design of the mold shape in the pre-molding stage prior to the final stage of the press largely depends on the experience of the engineer, and a method for determining the mold shape has not been established.

  In order to avoid premature flange cracking when forming the flange by bending the inner side or the outer side, that is, out of the plane, the inventors have performed the preforming effectively. A research study was conducted. And at the pre-molding stage, if we can give a cross-sectional line length comparable to the final shape, we know that it will be possible to obtain the final shape with the same strain distribution as during pre-molding at the time of final molding. The invention described in Document 1 was obtained. The inventors have made further studies and found that the pre-walled portion Y, which is deformed in the thickness direction, is flattened as the flange is bent (the deformation process toward the original surface shape of the flange). ) Obtained the knowledge that it depends on the deformation direction of the pre-walled portion Y when forming the pre-walled portion. In this embodiment, based on the knowledge, by optimizing the deformation direction and height of the pre-walled portion Y and controlling the deformation process of the pre-walled portion Y, the plate thickness reduction rate at the maximum stretch flange deformed portion P can be reduced. It is possible to more reliably disperse the suppression.

  Here, FIG. 1 shows an example of a press-formed product 1 having an out-of-plane deformed portion F in which a part of the flange is deformed out of plane to become a concave surface. 1A to 1C exemplify a case where the shape of the molded product is a U-shaped cross section, but the shape is not limited to a U-shaped cross section, and only one side is applicable as shown in FIG. It may be a molded product shape in which a flange is formed. In the example of FIG. 1, the surface shape along the plate edge of the out-of-plane deformed portion F is illustrated as a concave shape, but the surface shape along the plate edge of the out-of-plane deformed portion F is a convex shape. Cases are also envisaged. Moreover, the flange which this embodiment makes object may be the flange part which follows a vertical wall part, for example in hat cross-sectional shape.

In the following description, a molded product shape as shown in FIG.
As shown in FIG. 2, the manufacturing method of the press-formed product 1 according to the present embodiment includes a pre-form portion forming step 2 as a pre-forming step and a final forming step 3.
<Pre-meat part forming process>
The pre-walled portion forming step 2 is performed on both sides or one side of the maximum stretch flange deformed portion P in a portion that becomes an out-of-plane deformed portion F that is deformed out of plane along a plate edge on a part of the flange of the press-formed product 1. This is a step of forming a pre-walled portion Y that is deformed in the plate thickness direction at the plate edge position. In the present embodiment, as described above, the case where the surface shape along the plate edge of the out-of-plane deformed portion F is concave is illustrated.

The maximum stretch flange deformed portion P is a flange that undergoes a stretch deformation greater than a preset value when the flange is formed by flange forming processing such as out-of-plane bending or the like, and is press-formed into a target molded product shape. It is the board edge position of a part. This maximum stretch flange deformation part P exists in the out-of-plane deformation part F in which the contour along the plate edge is deformed out of plane into a concave shape in a part of the flange, for example, the radius of curvature of the contour along the plate edge Is located in the vicinity of the smallest point.
The maximum stretch flange deformed portion P is specified by examining the distribution of the thickness reduction rate and the strain distribution by creating a test product or performing a simulation analysis by CAE, and in the out-of-plane deformed portion F. What is necessary is just to specify the position of the largest elongation deformation part.

In the pre-formed part forming step 2, the pre-formed part Y is formed by press molding or the like on both sides or one side of the maximum stretch flange deformed part P specified as described above. By forming the pre-walled portion Y, line length alignment along the plate edge of the flange is performed in advance.
The pre-wall portion Y is formed at a position where the strain applied to the pre-wall portion can be dispersed to the maximum stretch flange deformed portion P when the pre-wall portion is crushed into a part shape.

In the present embodiment, when the pre-walled portion Y is deformed from the flat metal plate 10 to a press-formed product, the position is equal to or less than the deformation amount of 70% of the deformation amount due to press molding at the maximum stretch flange deformable portion P. Until it is set apart from the largest extension deformation part. Preferably, the pre-wall portion Y is set apart from the upper maximum stretch flange deformed portion P to a position equal to or less than 50% of the amount of deformation due to press forming at the maximum stretch deformed portion.
Moreover, the cross-section line length increase amount of the flange along the said board edge by shape | molding the pre-wall part Y formed in the pre-form part formation process 2 is set to below the cross-section line length increase amount in the press molded product 1. To do. The larger the cross-sectional line length increase is, the more effective it is against cracking. However, from the viewpoint of suppressing the generation of wrinkles, it is preferable to set the cross-section line length increase amount or less in the press-formed product 1.

(Shape of pre-mesh part Y)
The pre-wall portion Y is provided on at least one side of both sides of the maximum stretch flange deformed portion P.
Each pre-walled portion Y is formed to be convex or concave in the thickness direction by deforming the metal plate 10 so as to be convex or concave in the thickness direction.
As shown in FIG. 3B and FIG. 4, each pre-walled portion Y of the present embodiment is exemplified by a case where it is composed of two concavo-convex portions Y <b> 1 and Y <b> 2 arranged along the outline of the plate edge X. Moreover, in this embodiment, each uneven | corrugated | grooved part Y1, Y2 is formed in the hump shape which each protrudes to one side of a plate | board thickness direction. That is, the pre-walled portion Y of the present embodiment has an undeformed portion Z that is not deformed in the plate thickness direction by the processing of the pre-walled portion forming step 2 between the adjacent uneven portions Y1, Y2 (see FIG. 4). . The undeformed portion Z is usually flat. When the undeformed portion Z is provided, the width of the undeformed portion Z is preferably equal to or less than the width of the uneven portions Y1 and Y2 on both sides in contact with the undeformed portion Z. Preferably it is 1/2 or less of the width | variety of uneven | corrugated | grooved part Y1, Y2.

However, two or more uneven portions may be formed without providing the undeformed portion Z. For example, you may deform | transform in the plate | board thickness direction so that a waveform may be formed by two or more uneven | corrugated | grooved parts (refer Fig.9 (a)). In the case where the undeformed portion Z is not provided, the undeformed portion Z becomes zero or less, and for example, the shape of the pre-walled portion Y in which a part of the adjacent uneven portions overlaps is also included.
Here, among the two or more concavo-convex parts Y1, Y2, the concavo-convex part farthest from the maximum stretch flange deformed part P is called a distal concavo-convex part Y2, and the remaining concavo-convex part is called a proximal concavo-convex part Y1. Further, for the deformation in the plate thickness direction, the larger the amount of protrusion of the out-of-plane deformed portion F toward the contact surface 10A side (the larger the amount of protrusion upward relative to the flat portion Z of the plate in FIG. 4), A description will be given assuming that the protruding amount is high. Here, the contact surface 10A side of the flange is usually the surface that contacts the die of the mold, and is bent from the contact surface 10A side to the surface opposite to the contact surface 10A side. As a result, the out-of-plane deformed portion F is formed. Further, the protrusion amount toward the contact surface 10A side is defined as a height that becomes a negative value, that is, lower as it protrudes to the opposite side (lower side in FIG. 4) to the contact surface 10A side.

Here, as described above, the pre-walled portion Y of the present embodiment is configured by two uneven portions Y1, Y2, and the case where each uneven portion Y1, Y2 has a bump shape is illustrated (FIG. 3B). ). That is, each pre-walled portion Y is an example in the case of one proximal uneven portion Y1 and one distal uneven portion Y2.
Then, as shown in FIG. 4, the pre-walled portion Y of the present embodiment is formed such that the proximal uneven portion Y1 is convex toward the contact surface 10A side (the upper side in FIG. 4), and the distal uneven portion Y2 Is formed so as to be concave on the abutting surface 10A side, that is, convex on the surface side opposite to the abutting surface 10A side (lower side in FIG. 4). Thus, the protrusion amount is set so that the proximal uneven portion Y1 protrudes higher than the distal uneven portion Y2 toward the contact surface 10A.
Here, with respect to the line length along the plate edge X, the deformation amount in the plate thickness direction of the concavo-convex portions Y1 and Y2 is the largest at the plate edge, and the shape is preferably such that the line length decreases as the distance from the plate edge increases. . For this reason, the concavo-convex portions Y1 and Y2 are shaped such that the width decreases as the distance from the plate edge X increases. Further, the widths of the uneven portions Y1 and Y2 and the undeformed portion Z are the widths at the plate edge position.

An example of processing for forming the pre-walled portion Y in the pre-walled portion forming step 2 will be described.
In the pre-process of the pre-wall portion forming process 2, the metal plate is trimmed so as to become the metal plate 10 having an outer peripheral contour corresponding to the press-formed product 1 as shown in FIG.
Then, a pre-walled portion Y is formed on a portion of the plate edge that becomes the out-of-plane deformed portion F in the trimmed metal plate 10 as shown in FIG. Reference numeral 10 </ b> B is a portion that becomes a flange on the side where the pre-wall portion Y is formed.

  As shown in FIG. 5, the die 20 for forming the pre-walled portion Y is formed with a convex portion 22 and a concave portion 21 for forming the pre-walled portion Y. The convex portion 22 and the concave portion 21 are a convex portion 22 and a concave portion 21 having a shape like a rugby ball, that is, a shape obtained by dividing an ellipsoid having an elliptical outline in the center in a plan view. The center of the ellipse is located at the flange plate edge X, and the major axis of the ellipse is designed to be in a direction intersecting the flange plate edge X (a direction orthogonal to FIG. 5).

By using this die 20, an uneven part deformed in the plate thickness direction is formed on the flange plate edge, and the height and width of the uneven part Y1, Y2 are set smaller as the distance from the plate edge increases. That is, since the cross-section line length is gained in the pre-walled portion Y, as shown in FIG. 3 (b), the uneven portions Y1 and Y2 of the pre-walled portion Y are deformed in the plate thickness direction from the bending line toward the plate edge. It is formed so as to increase. This is because the amount of elongation is greater on the side of the plate edge.
Here, the trimming may be performed after the pre-walled portion Y is formed before trimming so as to have an outer peripheral contour corresponding to the press-formed product 1.
In the pre-wall portion forming step 2, as shown in FIG. 6, by using the die as described above, pressing with the die 20 and the punch 30 (lower die) for the pre-wall portion forming step 2, the pre-wall portion is formed. Part Y is provided.

<Final molding process>
The final forming step 3 is a step of forming the pre-walled portion Y, press-molding the shape of the molded part in one or more stages, and forming the final shape.
In the final forming step 3, in the flange forming step in which at least the flange that forms the out-of-plane deformed portion F is formed by bending out of the surface, for example, as shown in FIG. In the state where 10 top plate portions 1A are sandwiched from the plate thickness direction by the punch 31 (lower mold) and the pad 30, the die 32 is lowered, so that the vertical wall portion 1B constituting the flange is changed to the top plate portion 1A. And the vertical wall portion 1B is formed by bending as a bending position.

<Processing example of this embodiment>
When the flat metal plate 10 is formed into a molded product shape as shown in FIG. 1A, for example, stretch flange deformation occurs at a portion where the curvature is large at a portion where the bending line is curved. In the shape of the molded product in FIG. 1A, the vertical wall portion 1B serving as a flange is bent downward along the bending line (the boundary line between the top plate portion 1A and the vertical wall portion 1B). This is an example in which 1B is formed. In this case, for example, the position P is the position of the maximum elongation deformation amount.

On the other hand, in the present embodiment, after forming the pre-walled portion Y and increasing the cross-sectional line length so as to approach the cross-sectional line length of the molded product shape, the target molded product shape is obtained. Press mold using a mold to obtain the desired molded product shape.
As described above, in this embodiment, by performing the process of forming the pre-wall portion Y in the vicinity of the maximum stretch flange position where there is a possibility of cracking, the dispersion of stretch occurs and the stretch flange Cracking can be prevented.

  Further, in the present embodiment, the pre-walled portion Y is composed of a plurality of uneven portions Y1, Y2, and, of the plurality of uneven portions Y1, Y2, the proximal uneven portion on the side closer to the maximum elongation deformed portion. The protrusion amount of Y1 toward the contact surface 10A is set high. In the present embodiment, the proximal concavo-convex portion Y1 is convex on the die 32 side (abutting surface 10A side), and the distal concavo-convex portion Y2 is on the side opposite to the die 32 (the surface side opposite to the abutting surface 10A side). ) Is convex.

  By doing in this way, when bending with the die 32 in the final forming step 3, the pre-walled portion Y comes first from the concavo-convex portion where the protruding amount toward the die 32 side is high along with the bending deformation of the flange. Deformation in the direction of flattening in contact with the die 32 is started. In the present embodiment, the proximal uneven portion Y1 close to the maximum stretch deformed portion starts the deformation to the flattening first, and the distal uneven portion Y2 starts the deformation to the flat after a delay. Thus, when the strain applied to the proximal uneven portion Y1 is dispersed in the plate edge direction, the dispersion toward the distal uneven portion Y2 is suppressed by the delayed flattening of the distal uneven portion Y2. That is, the distal concavo-convex portion Y2 acts as a stopper for the dispersion, so that the strain applied to the proximal concavo-convex portion Y1 is not dispersed over a wide range and is efficiently dispersed toward the maximum stretch deformed portion. As a result, it is possible to more reliably suppress an increase in the plate thickness reduction rate at the maximum stretch flange deformed portion P.

Thus, in this embodiment, the deformation | transformation direction and height of the preliminary meat part Y are optimized, and the distal uneven part Y2 in the uneven part which comprises the preliminary meat part Y deform | transforms into flattening last. By setting to start, the strain at the maximum stretch flange deformed portion P can be more reliably and efficiently dispersed.
Here, in order to evaluate the effect of the present embodiment, the metal plate 10 having a tensile strength of 980 MPa and a thickness of 1.6 mm is preliminarily formed into a shape as shown in FIG. The plate thickness reduction rate at the maximum stretch flange deformed portion P due to the shape of the meat portion Y was evaluated by CAE analysis. The pre-walled portion Y is provided on both sides of the maximum stretch flange deformed portion P, and each pre-walled portion Y is formed with two uneven portions (that is, the proximal uneven portion Y1 and the distal uneven portion Y2). The conditions were the same except for the protruding direction. Here, the concavo-convex portion protruding to the contact surface 10A side (die side) is referred to as a convex shape, and the concavo-convex portion protruding to the opposite side is referred to as a concave shape.

As shown in FIG. 4, when the proximal uneven portion Y1 is convex and the distal uneven portion Y2 is concave, the plate thickness reduction rate at the maximum stretch flange deformed portion P is 38%.
On the other hand, as shown in FIG. 8, when the proximal concavo-convex portion Y1 is concave and the distal concavo-convex portion Y2 is convex, the plate thickness reduction rate at the maximum stretch flange deformed portion P is 68%. . In this case, since the distal uneven portion Y2 starts to deform first and there are no peaks, the action as a stopper is small when the proximal uneven portion Y1 is deformed to be flattened, and is given to the proximal uneven portion Y1. This is because the strain was dispersed over a wide range.

Here, when both the proximal concavo-convex portion Y1 and the distal concavo-convex portion Y2 are convex, the plate thickness reduction rate at the maximum stretch flange deformed portion P was 60%. This is because the proximal concavo-convex portion Y1 and the distal concavo-convex portion Y2 have the same height, but since the concave deformation is formed on the abutment surface 10A side, the deformation on the distal concavo-convex portion Y2 side is slightly This seems to be the effect of being delayed.
As can be seen from this evaluation, the deformation direction and height of the pre-walled portion Y are optimized so that the distal uneven portion Y2 in the uneven portion of the pre-walled portion Y starts to deform to flattening last. By setting to, the strain at the maximum stretch flange deformed portion P can be more reliably dispersed.

FIG. 9 shows a modification of the preliminary meat portion Y.
FIG. 9A shows an example in which two uneven portions Y1 and Y2 are formed continuously. However, it is preferable that the undeformed portion Z is present between the proximal uneven portion Y1 and the distal uneven portion Y2 from the viewpoint of more reliably delaying the start of deformation of the distal uneven portion Y2 to flattening. However, if the width of the undeformed portion Z is too wide, the function of the distal uneven portion Y2 as a stopper is reduced, so the width of the undeformed portion Z is preferably equal to or less than the width of the proximal uneven portion, more preferably It is less than half of the width of the uneven portion.

FIG. 9B shows a case where both the proximal concavo-convex portion Y1 and the distal concavo-convex portion Y2 are convex on the abutting surface 10A side (die 32 side), but the height on the proximal concavo-convex portion Y1 side is increased. This is an example. However, from the viewpoint of more surely delaying the start of deformation of the distal concavo-convex portion Y2 to flattening, it is preferable to make the distal concavo-convex portion Y2 concave as shown in FIG.
FIG.9 (c) is a figure which shows the example in the case of comprising from two proximal uneven | corrugated parts Y1.
Here, the present invention can be applied not only to automobile parts but also to all processes for press-molding plate materials. The material for press molding is not limited to steel, but can be applied to iron alloys such as stainless steel, and also to non-ferrous materials.

DESCRIPTION OF SYMBOLS 1 Press molded product 1A Top plate part 1B Vertical wall part 2 Pre-wall part formation process 3 Final forming process 10 Metal plate 10A Contact surface 20 Die 30 Punch 31 Pad 32 Die F Out-of-plane deformation part P Maximum stretch flange deformation part X Plate Edge Y Pre-walled part Y1 Proximal uneven part Y2 Distant uneven part Z Undeformed part

Claims (6)

A press-molded product manufacturing method for press-molding a metal plate into a press-molded product having an out-of-plane deformed portion whose contour along the plate edge is deformed out of plane on a part of the flange by bending,
A pre-walled portion forming step for forming a pre-walled portion formed by deforming the plate edge positions on both sides or one side of the maximum stretch flange deformed portion of the out-of-plane deformed portion,
A flange forming step of forming a flange having an out-of-plane deformed portion by bending the metal plate portion to be the out-of-plane deformed portion after forming the pre-walled portion;
The pre-mesh portion is composed of two or more concavo-convex portions arranged along the outline of the plate edge and each protruding in one of the plate thickness directions,
Of the two or more concavo-convex portions, the concavo-convex portion furthest from the maximum stretch flange deformed portion is called a distal concavo-convex portion, the remaining concavo-convex portions are called proximal concavo-convex portions, and the direction bent by the bending process When the surface side of the metal plate facing the opposite side is referred to as the contact surface, and further, among the deformations in the plate thickness direction, when the protrusion amount to the contact surface side is larger, the protrusion amount is higher,
The method for producing a press-formed product, wherein the protruding amount of the proximal uneven portion is higher than the protruding amount of the distal uneven portion. The proximal concavo-convex portion is formed by being deformed in the plate thickness direction so as to be convex toward the contact surface side,
2. The press-formed product according to claim 1, wherein the distal concavo-convex portion is formed by being deformed in a plate thickness direction so as to be convex on a surface side opposite to the contact surface side. Manufacturing method.   Between the adjacent concavo-convex portions of the two or more concavo-convex portions, there is an undeformed portion that does not deform in the plate thickness direction in the pre-wall portion forming step, and the width of the undeformed portion is the concavo-convex portion at the plate edge position. The method for producing a press-formed product according to any one of claims 1 and 2, wherein the press-formed product has a width equal to or less than. A press-molded product manufacturing method for press-molding a metal plate into a press-molded product having an out-of-plane deformed portion whose contour along the plate edge is deformed out of plane on a part of the flange by bending,
A pre-walled portion forming step for forming a pre-walled portion formed by deforming the plate edge positions on both sides or one side of the maximum stretch flange deformed portion of the out-of-plane deformed portion,
A flange forming step of forming a flange having an out-of-plane deformed portion by bending the metal plate portion to be the out-of-plane deformed portion after forming the pre-walled portion;
The pre-mesh portion is composed of two or more concavo-convex portions arranged along the outline of the plate edge and each protruding in one of the plate thickness directions,
Of the two or more concavo-convex parts, when the concavo-convex part farthest from the maximum stretch flange deformed part is called a distal concavo-convex part and the remaining concavo-convex part is called a proximal concavo-convex part,
In the bending process in the flange forming step, the distal concavo-convex part has a slower onset of deformation to flattening than the proximal concavo-convex part, and a method for manufacturing a press-formed product,   In the mold used in the flange forming step, a die for bending the flange contacts the proximal uneven portion before the distal uneven portion in the process of bending the flange. A method for manufacturing a press-formed product according to claim 4.   Between the adjacent concavo-convex portions of the two or more concavo-convex portions, there is an undeformed portion that does not deform in the plate thickness direction in the pre-wall portion forming step, and the width of the undeformed portion is the concavo-convex portion at the plate edge position. The method for manufacturing a press-formed product according to any one of claims 4 and 5, characterized in that the width is less than or equal to the width.

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