WO2018034120A1 - Method for manufacturing blank, blank, method for manufacturing press-molded article, and press-molded article - Google Patents

Abstract

Through the present invention, a differential-thickness blank as an integrated object having a plate thickness distribution is provided by a simple method. A first blank (2) as a blank having larger dimensions than the dimensions of a desired blank (1) for use in press molding is drawn using a punch (3) and a die, and the drawn first blank (2) is trimmed to the necessary dimensions and used as the abovementioned desired blank (1) for use in press molding. During drawing, the punch (3) has a punch bottom having larger dimensions than the dimensions of the desired blank (1), and restriction of a portion of positions on the external periphery of the first blank (2) during drawing is made relatively stronger, whereby a portion of the plate thickness in the desired blank (1) after drawing is relatively reduced to obtain a blank having a plate thickness distribution.

Description

Blank material manufacturing method, blank material, press molded product manufacturing method, and press molded product

The present invention has a thickness distribution, that is, a method of manufacturing a blank material having a difference in thickness within the same blank material, a technique related to the blank material having the thickness distribution, and such a blank material. The present invention relates to a method for manufacturing a press-formed product and a technology related to the press-formed product.

For example, in automobile parts, for the purpose of achieving both collision safety, vehicle rigidity, and weight reduction of the vehicle body, press molding may be performed on parts having a distribution in plate thickness within the same part. At this time, in order to produce a press molded product having a thickness difference of a predetermined value or more by press molding, the blank material needs to be a differential thickness blank material having a thickness distribution at the stage of the blank material before pressing. There is. As such a blank material having a distribution in plate thickness, a tailored weld blank material (hereinafter referred to as TWB) in which a plate material is partially welded to a main plate material of a base material to provide a plate thickness distribution, rolling There is a tailored rolled blank material (hereinafter referred to as TRB) having a tapered plate thickness distribution. There is also a differential thickness blank material, such as Patent Document 1, in which a reinforcing plate material is partially bonded and bonded to a main plate material as a base material.
In this specification, a blank material having a plate thickness distribution is also referred to as a differential thickness blank material.

JP 2002-178170 A

In the differential thickness blank as described above, it is necessary to use a dedicated facility such as a welding facility for manufacturing TWB and a rolling facility for manufacturing TRB. Moreover, in order to manufacture the differential thickness blank material described in Patent Document 1, an operation of placing a reinforcing plate on the main plate as a base material, an operation of applying an adhesive to the reinforcing plate, and the like occur, and the process is performed. It becomes complicated.
Moreover, in the difference thickness blank material of TWB and patent document 1, it becomes a blank material which has a weld line and a joining line in a plate | board thickness part.

On the other hand, TRB can provide a single-piece differential thickness blank material that does not have a weld line, but the difference in thickness between the thin part and the thick part is too large to be removed, and a steep difference in thickness. It is difficult to obtain a blank material having Although TRB is excellent in mass productivity, an expensive rolling device is required for each taper shape, and since the taper shape is linearly formed along the rolling direction, a plurality of taper shapes can be simplified. It is not suitable for production by simple methods.

The present invention has been made paying attention to the above points, and provides an integrated differential thickness blank material having a thickness distribution by a simple means and a press-molded product manufactured from the differential thickness blank material. The purpose is to do.

Inventors will simply conduct research to produce a differential thickness blank with a plate thickness distribution using equipment used in conventional press forming, and combine draw forming and stretch forming together. Thus, it has been found that it is possible to easily provide a plate thickness distribution in the blank.

Based on such knowledge, one aspect of the present invention is a method of manufacturing a blank material that is press-formed into a press-formed product having a plate thickness distribution,
The first blank material, which is a blank material having a size larger than that of the target blank material used for the press molding, is drawn using a punch and a die, and the first blank material after the drawing processing. Is trimmed to the required dimensions to obtain a blank material for the purpose of press molding,
In the drawing process, the punch has a punch bottom having a size larger than the size of the target blank material, and the position of a part of the outer periphery of the first blank material in the drawing process is restricted. By relatively strengthening, the thickness of a part of the target blank material after the drawing process is relatively reduced, and the target blank material is used as a blank material having a thickness distribution. And

Another aspect of the present invention is a method for manufacturing a press-molded product, in which a blank material having the above-mentioned plate thickness distribution is press-molded to produce a press-molded product having a plate thickness distribution.

According to one aspect of the present invention, it is possible to easily produce a monolithic differential thickness blank with a press molding facility.
Moreover, it becomes possible to provide a press-formed product having a plate thickness distribution of a predetermined value or more by using such an integrated difference thickness blank material.

It is sectional drawing which shows the relationship between the target blank material and a 1st blank material. It is a conceptual diagram which illustrates the manufacturing process of the objective blank material. It is a figure which shows an example of a press-formed product. It is a conceptual diagram of the press die used in the manufacturing process of the target blank material. It is an upper surface schematic diagram of a 1st blank material. It is an upper surface schematic diagram of a 1st blank material. It is a figure explaining the setting of perfect overhang conditions, (a) is a figure which shows a punch shape, (b) is a figure which shows the relationship between a blank material and restraint. It is a figure explaining the relationship between minimum board thickness and punch shoulder R. FIG. It is a figure which shows plate | board thickness distribution in a center longitudinal direction. It is a schematic diagram which shows the conditions which hold a boundary part with a pad. It is a figure which shows plate | board thickness distribution in the center longitudinal direction at the time of using a pad. It is a figure which shows the relationship between punch shoulder R and an area ratio. It is a conceptual diagram for demonstrating the method to manufacture a press-formed product from a difference thickness blank material.

Next, an embodiment of the present invention will be described.
Here, the embodiment described below exemplifies a configuration for embodying the technical idea of the present invention, and the technical idea of the present invention is that the material, shape, structure, etc. of the component parts are as follows. It is not specific to that. The technical idea of the present invention can be variously modified within the technical scope defined by the claims described in the claims.
The technology of the present embodiment is a technology that can be applied to any part using a metal blank that constitutes an automobile, a home appliance, or the like, but it is a particularly effective technology for components whose plate thickness greatly contributes to rigidity. For example, a part having a relatively flat cross-sectional shape needs to ensure rigidity on the flat surface that does not easily deform due to an external force by a human hand, and the thickness contributes greatly to the rigidity. Therefore, the technology of the present embodiment is particularly suitable for manufacturing parts having a plate thickness difference, such as automobile panel parts such as roofs, doors, hoods, and back doors, and home appliance exterior panels.

In the following example, description will be made assuming an automobile panel component.
When the blank material is press-formed by drawing (pressing) using a punch and a die, it is formed into a cross-sectional shape having a flange portion, a vertical wall, and a top plate portion (a portion pressed against the punch bottom). If this molding is a complete overhang molding which is a molding in which the outer periphery (flange portion) of the blank material is completely restrained (fixed), the material does not flow from the outer periphery during the molding of the vertical wall, and the punch shoulder R is large. Correspondingly, the material flows out from the top plate (punch bottom) to the vertical wall. On the other hand, if the forming is a drawing process in which the outer periphery of the blank material is not constrained or formed with a small restraining force, the material hardly flows into the vertical wall from the top plate (punch bottom) when forming the vertical wall, It flows from the outer peripheral part (flange part). Therefore, when press-molding into the same shape, the top plate portion facing the punch bottom tends to be thin due to outflow of material in overhang molding, and the plate thickness is small because of the small outflow of material in draw forming. It is hard to become thin.

In this embodiment, using the above, in a partially constrained state in which only the outer peripheral position surrounding a part of the outer periphery of the first blank member larger than the target blank member is restricted. Perform drawing. At this time, in the portion corresponding to the top plate portion of the first blank material, the outflow of the material in a part of the region is relatively increased, so that the thickness distribution is distributed on the top plate portion pressed against the punch bottom. It is formed. And the difference thickness blank material which has plate thickness distribution from which plate | board thickness differs along a surface in planar view is obtained by trimming the part made into the target blank material from the top-plate part after the drawing.

More specifically, in the present embodiment, first, as shown in FIG. 1, a first blank material 2 larger than the target blank material 1 is prepared. In addition, if the 1st blank material 2 consists of metal materials which can be pressed, such as an aluminum alloy and stainless steel, this invention is applicable.
And in this embodiment, as shown in FIG. 2, it draws using the punch 3 which has a dimension of a punch bottom larger than the target blank 1. At that time, with respect to the restraint of the flange portion on the outer periphery of the first blank 2, for example, by restraining only the outer peripheral portion surrounding the region where the plate thickness is relatively thin with a bead or the like, the main deformation is partially performed. Drawing is performed by stretch forming, with the main deformation of other parts being in a partially constrained state that results in drawing (FIGS. 2A and 2B). FIG. 2A illustrates a case where the left half is restrained with a bead. Bold arrows shown in FIG. 2 (b) indicate the moving direction of the material.

As a result, it is possible to generate a plate thickness distribution on the top plate portion 2A of the first blank 2 after the drawing.
Then, from the top plate portion 2A where the plate thickness distribution is generated, a portion having a necessary dimension is trimmed (FIG. 2 (c)) to obtain a target blank material 1 as a differential thickness blank material (FIG. 2 (d)). ). A broken line in FIG. 2C illustrates the trim position TRM.
Here, the outflow of the material from the position of the punch bottom to the vertical wall at the time of stretch forming is more likely to occur as the punch shoulder R is larger. For this reason, from the viewpoint of increasing the effect of reducing the plate thickness due to the outflow, the larger the radius of curvature of the punch shoulder R, the better.

However, when the dimensions of the punch 3 are the same, as the punch shoulder R increases, the area of the punch bottom (area of the flat portion) decreases and the width of the punch shoulder increases. For this reason, the dimension of the 1st blank material 2 required in order to obtain the target blank material 1 becomes large, and it leads to the yield reduction of material.
From the above viewpoint, the punch shoulder R is preferably 50 mm to 200 mm, and more preferably 100 mm to 150 mm.

Further, in the top plate portion 2A pressed at the punch bottom, a boundary (position where a step is formed in the plate thickness direction) between the portion where the plate thickness is relatively thin and the portion where the plate thickness is relatively thick is pressed. The drawing process may be performed in a state where a pad (a movable punch biased by a spring or the like) is applied to the portion to restrict material movement in the surface of the top plate portion 2A.
Here, when pressing with the punch 3, it is also assumed that the material moves from the portion where the plate thickness is relatively thick toward the portion where the plate thickness is relatively thin, but the boundary portion is pressed with the pad PAD. Thus, the movement of the material is suppressed at the position of the pad PAD. As a result, the steepness of the plate thickness difference between the portion where the plate thickness is relatively thick and the portion where the plate thickness is thin can be set large.

When the method of manufacturing the differential thickness blank material by press molding based on the present invention is adopted, the ratio of the plate thickness difference between the relatively thin plate portion and the thick plate portion to the plate thickness of the thin plate portion ( (Also referred to as the ratio of the plate thickness difference) can be set to 2% or more, and further 4% or more (see examples described later). Further, the ratio of the plate thickness difference is preferably 10% or less. A more preferable ratio of the plate thickness difference is 4% or more and 6% or less. What is necessary is just to prescribe | regulate the ratio of this board thickness difference by the level | step difference position formed in the boundary. This is because the plate thickness change is the largest at the step position.
Here, since the difference in the plate thickness is small if the ratio of the plate thickness difference is less than 2%, the advantage is that the difference thickness blank material is manufactured by press molding into a press molded product having a plate thickness distribution using the difference thickness blank material. Compared to the manufacturing cost of On the other hand, in order to obtain a plate thickness difference with a plate thickness difference ratio larger than 10%, the amount of deformation of the blank increases, and there is a risk of breakage. However, this is not the case when the blank is excellent in ductility because the risk of breakage is reduced.

Moreover, although the difference thickness blank material illustrated in FIG.1 and FIG.2 is an example in case the plate | board thickness level | step difference is formed only on one side and it has plate | board thickness distribution along a surface, it is plate | board thickness on both surfaces It may be a differential thickness blank having a step. However, the difference thickness blank material with a single-sided step is easier to manufacture, and the difference thickness blank material is easy to understand the distribution of the plate thickness difference.
Moreover, although the thickness difference blank material illustrated in FIG.1 and FIG.2 is a case where the level | step difference of board thickness is formed along the linear boundary position extended in a board width direction, the boundary line which forms a level | step difference is It may be set in a curved shape.
There may be two or more boundary positions forming the step. When boundaries are set at a plurality of positions, the heights of the steps formed at the boundaries may be set differently.

Hereinafter, an example of the present embodiment will be described with reference to the drawings.
Here, as an example of the press-formed product as the final part, a vehicle roof part 10 as shown in FIG. 3 is assumed. The roof part 10 has a curved shape in which a front portion 10A is curved downward toward the front (left side in FIG. 3), and a rear portion 10B has a substantially flat shape. The front portion 10A has a curved shape, so that a predetermined rigidity can be ensured by the structure. Therefore, the plate thickness is relatively reduced to reduce the weight of the component. On the other hand, the rear portion 10B is designed to be thicker than the front portion 10A in order to ensure snow cover strength. That is, the roof component 10 is a press-formed product having a thickness distribution in which the thickness of the front portion 10A is relatively thin.

From the shape of the press-formed product, the size and shape of the target blank 1 that can be formed into the press-formed product by an assumed press is obtained by simulation analysis such as CAE analysis. In the present embodiment, the target blank 1 is a rectangular blank. You may set so that the flange outer periphery in the target blank 1 may be trimmed to the product shape of a press-formed product.
Here, the press equipment for manufacturing the target blank material 1 as the differential thickness blank material is composed of the structure of a normal press equipment, and at least as shown in FIG. 4, the die 4, the punch 3, and the blank A holder 5 is provided.

Then, a punch 3 having a rectangular punch bottom as shown in FIG. 2 (a) having a size larger than that of the target blank 1 having the rectangular shape is selected, and a first having a size larger than the punch bottom is selected. The blank material 2 is selected.
Moreover, the area | region F which makes the plate | board thickness thin in the target blank 1 is set from the plate | board thickness distribution in the said press-formed product. In the present embodiment, a region on the left side in the longitudinal direction in the target blank 1 is set as a region F in which the plate thickness is relatively thin (see FIG. 4).
Next, a region to be trimmed as the target blank material 1 is hypothesized in the portion pressed at the punch bottom in the first blank member 2, and corresponds to the region F in the virtual trim region as shown in FIG. The part F ′ is specified. Further, the outer peripheral portion of the first blank 2 surrounding the portion F ′ corresponding to the region F is specified as the restraining position L.

In the present embodiment, as shown in FIG. 5, since the portion F ′ corresponding to the region F is located in the region of the left side portion in the longitudinal direction of the first blank member 2, the left side and the left side of the first blank member 2 A part of the upper side and the lower side subsequent to is set as a restraint position L in a U-shape. Then, restraining beads 4a and 5a are formed on the blank holder 5 portion and the die 4 portion that restrain the restraining position L (see FIG. 4). The bead may be formed continuously along the outer peripheral edge of the first blank member 2 or may be formed intermittently along the outer peripheral edge.
A punch 3, a die 4 and a blank holder 5 having the above-described configuration are prepared. The die 4 and the blank holder 5 hold the outer periphery (flange portion) of the first blank material 2. At this time, the restraining force is strongly set by forming the beads 4a and 5a at the outer peripheral position of the first blank 2 located at the restraining position L.

In this state, as shown in FIG. 4, the first blank member 2 is drawn by raising the lower punch 3. With this molding, the top plate portion 2A is formed in a substantially rectangular shape so as to protrude upward from the first blank 2. At this time, in the left part in the longitudinal direction, since the outer periphery is constrained, it is mainly stretched, and the material of the part that becomes the top plate portion 2A flows out to the vertical wall side, so that the plate thickness becomes relatively thin. On the other hand, on the right side in the longitudinal direction, since the outer periphery is not constrained, it is mainly drawn, and the material of the outer peripheral portion flows to the vertical wall side, so that the reduction in the thickness of the portion that becomes the top plate portion 2A is suppressed to a small value (see FIG. 2 (b)).
That is, by this drawing, a plate thickness portion in which the plate thickness on the left side in the longitudinal direction in the top plate portion 2A is thin is provided.

Next, when the punch 3 is lowered and returned to the standby position, the portion to be the target blank material 1 in the top plate portion 2A formed by trimming is trimmed along the trim position TRM as a differential thickness blank material. The objective blank 1 is obtained.
The target blank 1 obtained as described above is press-molded by the press dies 20 and 21 as shown in FIG.
The press part as the final part is not limited to the roof part. The present embodiment can be suitably applied as long as it is a panel-shaped press-formed product having a plate thickness distribution.

As described above, in the present embodiment, it is possible to easily manufacture a target blank 1 made of a single-piece differential thickness blank with a press molding facility. Then, by using the target blank 1 made of the integrated difference thickness blank, it is possible to provide a press-formed product having a plate thickness distribution of a predetermined value or more more easily than before.
Here, when performing the drawing process for obtaining the target blank 1, the pad PAD is used to set the boundary position between the relatively thin part and the thick part as shown in FIG. 6. Drawing may be performed in a pressed state.

When the pad PAD is not pressed, when the drawing process is performed with the punch 3, the material moves from the right side to the left side even in the plane of the top plate portion 2A, so that the portion and the plate that are relatively thin in thickness A taper for changing the plate thickness is formed at and near the boundary of the portion where the thickness is increased. On the other hand, by pressing with the pad PAD and pressing, it is possible to obtain a plate thickness distribution in which a step is formed in a portion where the plate thickness is relatively thin and a portion where the plate thickness is relatively thick.
Here, the punch 3 may be a split type. For example, you may use the punch isolate | separated in the boundary position of the part which makes plate | board thickness relatively thin, and the part which makes plate | board thickness thick.

The CAE analysis about the objective blank material manufacture about the said embodiment was performed.
In CAE analysis, LS-DYNA was used as analysis software, and analysis was performed by a dynamic explicit method.
At this time, a 270D cold-rolled steel plate was set as the first blank member 2, and the original plate thickness was set to 0.7 mm.
Further, as the final press-formed product, the above-described roof part, which is a part having a thickness distribution of 0.05 mm between the front part and the rear part, was assumed.

Then, as shown in FIG. 7, the squeezing is performed under the condition that the outer periphery of the first blank member 2 except the right side is constrained (completely formed state) and the punch shoulder R is set from the trim line. I tried to process. A portion surrounded by a broken line in FIG. 7A is a flat punch bottom. Under this condition, the size of the first blank member 2 is half the size of the left portion. Further, as the punch shoulder R condition, the setting was changed to 50 mm, 100 mm, 150 mm, and 200 mm, and the relationship between the plate thickness minimum value and the punch shoulder R at the center position in the width direction of the top plate portion 2A was obtained. The result is shown in FIG.

As can be seen from FIG. 8, it can be seen that the minimum plate thickness at the position in contact with the center of the punch bottom decreases as the punch shoulder R increases. The reason for this is that as the punch shoulder R increases, the bending resistance of the material decreases and the material easily flows out from the bottom of the punch. As the punch shoulder R increases, the punch 3 increases and a blank material in a wide area is formed. Therefore, it is considered that the strain was dispersed and the molding height was increased. From these results, it is presumed that the punch bottom R can be made 0.65 mm or less by setting the punch shoulder R to 150 mm or more. In addition, the height of the vertical wall is not particularly defined, but it is preferable that the height is low in relation to the yield.

Next, as shown in FIG. 2, only the left side portion of the outer periphery of the first blank 2 is constrained (partial overmolding state), and the punch condition is set with the punch shoulder R from the trim position. Drawing was the analysis. At this time, the punch shoulder R condition was set to 1500 mm. And when the plate | board thickness distribution along the longitudinal direction in the width direction center position of 2 A of top-plate parts was calculated | required, the result shown in FIG. 9 was obtained.

As can be seen from FIG. 9, as compared with the case where the entire outer periphery excluding the right side of the first blank member 2 having a half size is constrained as shown in FIG. In the case of a certain first blank 2, the minimum plate thickness is thicker. In other words, the plate thickness difference in the left-right direction was 0.032 mm. This is presumably because the material was moved from the right side to the left side at the punch bottom during molding because there was no restriction on the right side part. In order to make a plate thickness difference larger than that at the punch bottom, it is estimated that it is necessary to suppress material movement at the punch bottom during molding. In the case of FIG. 9, since the minimum plate thickness is about 0.66 mm and the plate thickness difference is 0.032 mm, the ratio of the plate thickness difference to the minimum plate thickness is 4.8%. That is, it can be seen that a differential thickness blank material having a thickness distribution of a thickness of 4% or more can be provided by press molding.

Therefore, as shown in FIG. 10, the boundary position between the front part and the rear part is set to the drawing condition in a state where the left and right central parts are pressed by the cylindrical pad PAD, and the movement of the material is suppressed and the difference in thickness is increased. Tried.
The analysis results are shown in FIG. As can be seen from FIG. 11, a steep step was formed at the boundary portion pressed by the pad PAD, and the plate thickness difference was 0.04 mm, confirming that the plate thickness difference was increased. This is presumed to be because the amount of movement to the left is greatly reduced by pressing with the pad PAD. In this example, the minimum plate thickness is about 0.656 mm, and the ratio of the plate thickness difference to the minimum plate thickness is 6.1%. Therefore, it can be seen that a plate thickness difference of up to 6.1% can be generated.

In the case of FIG. 9, the plate thickness difference is formed within a distance of about 2300 mm, but in the case of FIG. 11, a steep step is formed within a distance of about 60 mm. Thus, according to the manufacturing method of this invention, it turns out that the change distance (transition area | region) of a plate | board thickness difference can be controlled by adjusting the presence or absence of a pad PAD and a constraint condition. For example, by deliberately increasing the change distance (transition region) of the plate thickness difference, the boundary between the thin plate portion and the thick plate portion can be made inconspicuous. The difference thickness blank material having a long change distance (transition region) of the plate thickness difference is suitable for a part that can be seen by a person such as an automobile panel or an outer panel of a home appliance.

Further, it is necessary to trim the top plate portion 2A by drawing and then trim it to obtain the target blank 1. If the punch shoulder R is increased at this time, the difference thickness that can be applied increases. However, since the punch 3 increases, the dimension of the first blank member 2 needs to be a larger blank member that is trimmed and becomes unnecessary. Increases, yield decreases. The area ratio of the trimmed and unnecessary portion relative to the blank material size before forming the differential thickness blank material was determined. The result is shown in FIG.
As can be seen from FIG. 12, the yield decreases as the punch shoulder R increases.

As described above, the entire contents of the Japanese Patent Application 2016-160691 (filed on August 18, 2016) to which the present application claims priority form part of the present disclosure by reference.
Although the present invention has been described with reference to a limited number of embodiments, the scope of rights is not limited thereto, and modifications of each embodiment based on the above disclosure are obvious to those skilled in the art.

DESCRIPTION OF SYMBOLS 1 Target blank material 2 1st blank material 2A Top plate part 3 Punch 4 Die 5 Blank holder 4a, 5a Bead 10 Roof part F Area L Restriction position PAD Pad TRM Trim position

Claims (9)

A method of manufacturing a blank material that is press-formed into a press-formed product having a plate thickness distribution,
The first blank material, which is a blank material having a size larger than that of the target blank material used for the press molding, is drawn using a punch and a die, and the first blank material after the drawing processing. Is trimmed to the required dimensions to obtain a blank material for the purpose of press molding,
During the above drawing process,
The punch has a punch bottom having a size larger than the size of the target blank.
By relatively strengthening the constraint on the position of a part of the outer periphery of the first blank material during the drawing process, the thickness of a part of the target blank material after the drawing process is relatively increased. A method for producing a blank material, characterized in that the blank material is thinned to make a blank material having a plate thickness distribution. Regarding the constraint on the outer periphery of the first blank material, the outer periphery of the portion where the plate thickness is desired to be increased while relatively restricting the outer periphery of the portion where the thickness is to be reduced is set to be mainly processed by overhanging. 2. The method for manufacturing a blank material according to claim 1, wherein the processing is mainly performed by drawing by setting the constraint of the wire weakly or releasing the constraint. The drawing is performed in a state in which the movement of the material is suppressed by applying a pad along the position of the first blank corresponding to the boundary portion of the plate thickness difference generated in the target blank. The manufacturing method of the blank material of Claim 1 or Claim 2. In the plate thickness of the target blank after the drawing, the ratio of the plate thickness difference between the relatively thin portion and the thick portion to the plate thickness of the thin portion is 2% or more. The method for producing a blank material according to any one of claims 1 to 3, characterized in that: A blank material that is press-formed into a press-formed product having a plate thickness distribution,
It is an integral blank material, and has a thickness distribution with a relatively thick part and a thin part,
A blank material, wherein a ratio of a difference in thickness between a thin plate thickness portion and a thick plate thickness portion to a plate thickness of the thin plate thickness portion is 2% or more. The blank material according to claim 5, wherein the plate thickness difference is formed only on one side of the blank material and has a plate thickness distribution. A method of manufacturing a press-molded product that press-molds a blank material to produce a press-molded product having a plate thickness distribution,
A method for producing a press-formed product, wherein the blank material according to claim 5 or 6 is used as the blank material. A method of manufacturing a press-molded product that press-molds a blank material to produce a press-molded product having a plate thickness distribution,
A method for producing a press-molded product, wherein the blank material is produced by the method for producing a blank material according to any one of claims 1 to 4. A press-formed product manufactured by the method for manufacturing a press-formed product according to claim 7 or 8.

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