JP6680416B1 - Press-molded product manufacturing method and manufacturing equipment - Google Patents

Abstract

In the present invention, the top plate portion (11), the vertical wall portion (12), and the flange portion (13) are provided, and the flange portion (13) extends from the first molding position P1 to the second molding position P2. A press-formed product (10) in which the height to the top plate portion (11) changes from the first product height H1 to the second product height H2, and a blank is processed in the first step. Then, the first intermediate vertical wall line length d1 / the first vertical wall line length D1: 0.80 to 1.20, the second intermediate vertical wall line length d2 / the second vertical wall line length D2: 0. Manufacturing an intermediate product satisfying 80 to 1.20, second molding height h2 / first molding height h1: 0.80 to 1.20, and processing the intermediate product in the second step. There is provided a method for producing a press-formed product, which comprises producing the press-formed product (10).

Description

The present invention relates to a method for manufacturing a press-formed product and manufacturing equipment.
The present application claims priority based on Japanese Patent Application No. 2018-124149 filed in Japan on June 29, 2018, and the content thereof is incorporated herein.

  The vehicle body is required to ensure the collision performance, and improvement of the vehicle body structure for the purpose of improving the collision performance is being promoted. Along with this, the shapes of parts constituting the automobile body have become complicated, and the difficulty of forming the parts has increased. In particular, in recent years, in order to achieve both improvement in collision performance and weight reduction, a high tensile strength material (High Tensile Strength Steel) is often used, and the difficulty of forming a member increases. On the other hand, improvement of molding technology for manufacturing such a member having high molding difficulty is also in progress. Patent Document 1 discloses a method of press-molding an L-shaped or T-shaped component having a curved portion. Patent Document 2 discloses a press molding method for an L-shaped product having a curved portion.

International Publication No. 2014/185428 International Publication No. 2012/070623

  The L-shaped or T-shaped component obtained by press molding has a top plate portion, a vertical wall portion, and a flange portion. For example, a press-molded product such as a center pillar outer is a component in which the product height from the flange portion to the top plate portion gradually changes as the end portion on the mounting side of the side sill is approached. Such parts are difficult to form, and wrinkles on the top plate and patterns left on the vertical walls (marks of bending points left during repeated bending) are likely to occur, but wrinkles and pattern remains If a large number of occurrences occur, the appearance quality will be deteriorated. Therefore, in order to further improve the appearance quality, it is necessary to stably suppress the generation of wrinkles and pattern residues.

  The present invention has been made in view of the above circumstances, and an object thereof is to improve the appearance quality of a press-formed product.

(1) In the method for manufacturing a press-formed product according to one aspect of the present invention, a curved portion has a portion extending in the first direction and the second direction, and a portion extending in the first direction and a portion extending in the second direction. A top plate part connected to the top plate part, a vertical wall part connected to the top plate part, and a flange part connected to the vertical wall part, and an arbitrary position in the first direction is defined as a first molding position and a first molding position. If the position closer to the curved portion than the position is referred to as the second molding position, the height from the first molding position to the second molding position from the flange to the top plate is the first product height. A method of manufacturing a press-formed product, which changes from H ₁ to a second product height H ₂ , wherein a portion corresponding to a top plate portion of the intermediate product corresponds to an intermediate top plate portion and a vertical wall portion of the intermediate product. The part corresponding to the intermediate vertical wall part and the flange part of the intermediate product is called the intermediate flange part. Of the intermediate vertical wall portion in the molding position, the intermediate vertical wall line length d ₁ line length of the first cross section perpendicular to the first _direction, of the intermediate vertical wall portion in a second molding position, the first direction The line length of the vertical section is the second intermediate vertical wall line length d ₂ , the height from the intermediate flange portion to the intermediate top plate portion at the first forming position is the first forming height h ₁ , and the second forming position. The height from the intermediate flange portion to the intermediate top plate portion at the position is the second molding height h ₂ , and the line length of the cross section of the vertical wall portion at the first molding position perpendicular to the first direction is the first. The vertical wall line length D ₁ and the line length of the vertical wall portion at the second forming position in the cross section perpendicular to the first direction are referred to as the second vertical wall line length D ₂ , and the blank is processed. Then, the first intermediate vertical wall line length d ₁ / the first vertical wall line length D ₁ : 0.80 to 1.20, the second intermediate vertical wall line length d ₂ / the second vertical wall line length D ₂ 0.80 to 1.20, a second forming height _{h 2} / first forming height _h 1: 0.80 to 1.20, a first step of producing the intermediate products that meet, the intermediate product A second step of manufacturing a press-formed product by processing.
(2) In the method for manufacturing a press-formed product according to (1) above, the blank may be a steel plate having a tensile strength of 590 MPa or more.

(3) A press-molded product manufacturing facility according to another aspect of the present invention includes a top plate part, a vertical wall part connected to the top plate part, and a flange part connected to the vertical wall part. And a second mold for forming a blank product into an intermediate product and a second mold for forming an intermediate product into a press-molded product. And a portion extending in the second direction, and a portion extending in the first direction and a portion extending in the second direction are connected via a curved portion, which is a portion for forming the top plate portion, and A vertical wall forming part that is a part that forms the vertical wall part, and a flange forming part that is a part that forms the flange part, and an arbitrary position in the first direction is a first forming position, If the position on the curved portion side of the first molding position is referred to as the second molding position, the second molding position is changed from the first molding position. Toward location, vary the height from the flange forming portion to the top plate forming part _'from the second product height H _2' is first product height H ₁ to the portion corresponding to the top plate portion of the intermediate product If the intermediate top plate portion, the portion corresponding to the vertical wall portion of the intermediate product is referred to as the intermediate vertical wall portion, and the portion corresponding to the flange portion of the intermediate product is referred to as the intermediate flange portion, the first mold is the intermediate top plate. An intermediate top plate forming part that is a part that forms a part, an intermediate vertical wall forming part that is a part that forms an intermediate vertical wall part, and an intermediate flange forming part that is a part that forms an intermediate flange part, And having a line length of a cross section perpendicular to the first direction of the intermediate vertical wall forming portion at the first forming position as a first intermediate vertical wall line length d ₁ ′, an intermediate vertical wall forming at the second forming position. parts, the line length of the cross-section perpendicular to the first direction the second intermediate vertical wall line length d ₂ ', the first molded The height from the intermediate flange-forming portion to the intermediate top plate forming portion first forming height at location h ₁ ', the height from the intermediate flange-forming portion to the intermediate top plate forming part of the second forming position the second At a molding height h ₂ ′ of the vertical wall molding portion at the first molding position, and the line length of the cross section perpendicular to the first direction is the first vertical wall line length D ₁ ′ and the vertical length at the second molding position. Assuming that the line length of the cross section of the wall forming part perpendicular to the first direction is referred to as a _second vertical wall line length D ₂ ′, the first mold and the second mold have a first intermediate position. Vertical wall line length d ₁ ′ / first vertical wall line length D ₁ ′: 0.80 to 1.20, second intermediate vertical wall line length d ₂ ′ / second vertical wall line length D ₂ ′: It is characterized in that it is configured to satisfy 0.80 to 1.20, second forming height h ₂ ′ / first forming height h ₁ ′: 0.80 to 1.20.

  In the present invention, "the product height changes from the first molding position to the second molding position" means that the product height changes as a whole from the first molding position to the second molding position. This means that the product height does not necessarily have to change continuously. That is, even if there is a portion where the product height does not change between the first molding position and the second molding position, the press where the product height is different between the first molding position and the second molding position. The molded product is a press-molded product to be molded in the present invention.

  According to the present invention, the appearance quality of a press-formed product can be improved.

It is a schematic perspective view showing an example of a press-formed product according to an embodiment of the present invention. It is a schematic side view of the press-formed product within the range from the first molding position to the second molding position. FIG. 2B is a schematic view of the press-formed product at the first molding position in FIG. 2A and is a cross-sectional view perpendicular to the first direction. FIG. 2B is a schematic view of the press-formed product at the second molding position in FIG. 2A and is a cross-sectional view perpendicular to the first direction. It is a schematic side view showing an example of a press-formed product according to an embodiment of the present invention. It is a schematic side view showing an example of a press-formed product according to an embodiment of the present invention. It is a schematic side view which shows an example of the intermediate product obtained by the process in the 1st process in the range of the 1st shaping position and the 2nd shaping position based on a prior art. FIG. 5B is a schematic view of the intermediate product in the first molding position of FIG. 5A, which is a cross-sectional view perpendicular to the first direction. FIG. 5B is a schematic view of the intermediate product in the second molding position of FIG. 5A, which is a cross-sectional view perpendicular to the first direction. FIG. 6 is a schematic view for explaining a method of processing the intermediate product of FIGS. 5A to 5C into a press-formed product. It is a schematic side view of the intermediate product obtained by the processing in the first step, which is within the range from the first molding position to the second molding position according to the embodiment of the present invention. FIG. 7B is a schematic view of the intermediate product in the first molding position of FIG. 7A, which is a cross-sectional view perpendicular to the first direction. FIG. 7B is a schematic view of the intermediate product in the second molding position of FIG. 7A, which is a cross-sectional view perpendicular to the first direction. It is a schematic diagram for explaining the processing method from the intermediate product of Drawings 7A-7C to a press-formed product. It is a schematic perspective view which shows a part of intermediate product which concerns on one Embodiment of this invention. It is a schematic sectional drawing of the 1st metal mold | die in a 2nd molding position. It is a schematic sectional drawing of the 1st metal mold | die in a 2nd molding position. It is a schematic sectional drawing of the processing die of a 1st metal mold in a 1st molding position. It is a schematic sectional drawing of the 2nd metal mold in a 2nd molding position. It is a schematic sectional drawing of the 2nd metal mold in a 2nd molding position. FIG. 7 is a schematic cross-sectional view of the second mold anvil in the first molding position. FIG. 2 is a schematic plan view of the press-formed product according to the embodiment of the present invention as seen from a direction perpendicular to the plate surface of the top plate portion. It is a schematic perspective view showing an example of a press-formed product according to an embodiment of the present invention.

  An embodiment of the present invention will be described below with reference to the drawings. In this specification and the drawings, elements having substantially the same functional configuration are designated by the same reference numerals, and duplicate description is omitted.

  In addition, in this specification, the numerical range represented using "-" means the range which includes the numerical values described before and after "-" as a lower limit and an upper limit. In the present specification, the term “process” is used not only as an independent process, but also when the intended purpose of the process is achieved even when it cannot be clearly distinguished from other processes. included. Further, it is obvious that the respective elements of the following embodiments can be combined with each other.

<Press-formed products>
FIG. 1 is a schematic perspective view showing a press-formed product 10 which is a molding target of the present embodiment. The press-formed product 10 of the present embodiment is a hat-shaped component having a top plate portion 11, a vertical wall portion 12 connected to the top plate portion 11, and a flange portion 13 connected to the vertical wall portion 12. The top plate portion 11 has a portion extending in the first direction A ₁ (hereinafter, “first extending portion 11a”) and a portion extending in the second direction A ₂ which is a direction different from the first direction A ₁ ( Hereinafter, it has "the 2nd extending part 11b". The press-formed product 10 of the present embodiment has a shape in which a pair of vertical wall portions 12 are provided at both ends of the top plate portion 11 in a cross section of the first stretched portion 11a perpendicular to the first direction A ₁ . in the cross section perpendicular to the second direction a ₂ of the second extending portion 11b, while the vertical wall portion 12 only at the ends of the top plate portion 11 is in the provided shape.

In the press-formed product 10 of the present embodiment, the vertical wall portion 12 extends in the direction perpendicular to the plate surface of the top plate portion 11, but the angle formed by the vertical wall portion 12 and the top plate portion 11 is Not limited to vertical. The angle (internal angle) formed by the vertical wall portion 12 and the top plate portion 11 may exceed 90 °, and the vertical wall portion 12 may be inclined with respect to the top plate portion 11. Further, the vertical wall portion 12 may be partially or wholly inclined with respect to the plate surface of the top plate portion 11 in the first direction A ₁ , the second direction A _2, and the curved portion 11c described later. Good.

Further, the names of the “ _first direction A ₁ ” and the “second direction A ₂ ” are defined for convenience of description, and the first direction A ₁ shown in FIG. 1 is referred to as the second direction. The second direction A ₂ shown in FIG. 1 may be referred to as the first direction. Note that the first direction A ₁ and the second direction A ₂ are different directions, and when the press-formed product 10 is viewed from the direction perpendicular to the top plate portion 11, the second direction A ₂ is the first direction. Cross for A ₁ . When the press-formed product 10 is, for example, a center pillar outer, the first direction A ₁ is the vehicle height direction, the second direction A ₂ is the vehicle length direction, and the first extending portion 11a is the side sill mounting side end and the roof side. The portion between the rail and the second extending portion 11b corresponds to the end on the side sill mounting side.

  As shown in FIG. 1, one end of the first extending portion 11a is connected to an intermediate portion of the second extending portion 11b, and the top plate portion 11 is a plane viewed from a direction perpendicular to the plate surface of the top plate portion 11. When viewed, it is formed in a T shape. The first stretched portion 11a and the second stretched portion 11b of the top plate portion 11 are smoothly connected so as to be curved in an arc shape, and a side having a smaller curvature with respect to one arc is defined as an outer side of the arc. If the side with the larger curvature is called the inside of the arc, the top plate portion 11 has a shape in which the plate surface exists outside the arc. In the present specification, an arcuately curved portion at a location where the first stretched portion 11a and the second stretched portion 11b are connected to each other is referred to as a "curved portion 11c". The vertical wall portion 12 is also connected to follow the curved portion 11c of the top plate portion 11, and the vertical wall portion 12 at the portion connected to the curved portion 11c is curved. Further, since the flange portion 13 is also connected to follow the curved vertical wall portion 12, the flange portion 13 is also curved in the curved portion 11c of the top plate portion 11.

FIG. 2A shows an arbitrary position in the first direction A ₁ shown in FIG. 1 (hereinafter, “first molding position P ₁ ”) and a curve in the first direction A ₁ that is more curved than the first molding position P _1. FIG. 11 is a schematic side view of the press-formed product 10 within the range of the position on the side of the portion 11c (hereinafter, “second molding position P ₂ ”). FIG. 2B shows a schematic sectional view of the press-formed product 10 at the _first molding position P ₁ in FIG. 2A. Further, FIG. 2C shows a schematic sectional view of the press-formed product 10 at the _second molding position P ₂ in FIG. 2A. The cross-sectional view referred to here is a view showing a cross section perpendicular to the first direction A ₁ .

As shown in FIGS. 2A to 2C, the press-formed product 10 has a product height (hereinafter, referred to as “first product height”) which is a height from the flange portion 13 to the top plate portion 11 at the first molding position P ₁ . is H _{1 ")} is the product height from the second forming position P ₂ flange portion 13 at a height of up to the top plate portion 11 (hereinafter," second product height H _{2 ")} lower than ing. In other words, in the press-formed product 10 of the present embodiment, the product height from the _first molding position P ₁ to the second molding position P ₂ is from the first product height H ₁ to the second product height. It is as high as H ₂ .

In the present specification, a vertical wall line length that is a line length of a cross section of the vertical wall portion 12 at the _first molding position P ₁ perpendicular to the first direction A ₁ (R stop and flange on the top plate portion 11 side). The length of the straight line between the R stop on the side of the portion 13) is the first vertical wall line length D ₁ and the vertical line length of the cross section perpendicular to the first direction A ₁ at the second molding position P ₂ . The wall line length (the length of a straight line between the R stop on the top plate portion 11 side and the R stop on the flange portion 13 side) is referred to as a _second vertical wall line length D ₂ . The first vertical wall line length D ₁ in the example shown in FIG. 2B is equal to the first product height H ₁ , but the first vertical wall line length D ₁ is the first product height H _1. May be longer than. Similarly, the second vertical wall line length D ₂ may be longer than the second product height H ₂ . The “R stop” in the present embodiment is the boundary between the curved region and the flat region.

In the present embodiment, an example in which the product height of the press-formed product 10 changes continuously as the product height increases from the _first molding position P ₁ to the second molding position P ₂ will be described. However, the product height of the press-formed product 10 is not limited to the continuously increasing example. The region where the product height changes may be included even in a part between the first molding position P ₁ and the second molding position P ₂ . For example, the product height may continuously decrease from the _first molding position P ₁ to the second molding position P ₂ of the press-formed product 10. Alternatively, from the _first molding position P ₁ to the second molding position P ₂ of the press-molded product 10, a part where the product height continuously decreases and a part where the product height increases may coexist. Further, the press-formed product 10 may include a portion where the product height does not change between the first molding position P ₁ and the second molding position P ₂ .

3 and 4 are schematic side views for illustrating a modified example of the press-formed product 10. In the example of FIG. 3, the product height H of the press-formed product 10 changes stepwise from the _first molding position P ₁ to the second molding position P ₂ . In FIG. 4, when viewed from a direction perpendicular to the wall surface of the vertical wall portion 12, the top plate portion 11 and the flange portion 13 are curved from the _first molding position P ₁ to the second molding position P ₂ . It is an example of a press-formed product 10. In the example shown in FIG. 4, the product height H continuously changes from the _first molding position P ₁ to the second molding position P ₂ . The press-formed product 10 as shown in FIGS. 3 and 4 is also included in the present invention.

The above cross-section, in the first forming position P ₁ or the second molding position P _2, when viewed from a direction perpendicular to the plate surface of the top plate portion 11, a top plate portion 11 and the vertical wall portion 12 Is a cross section perpendicular to the ridgeline formed by (when the ridgeline is a curve, the normal line at the molding position).

(Maximum product height H _max and minimum product height H _min )
In the press-formed product according to the present embodiment, the ratio (H _max / H _min) between the maximum product height H _max of the press-formed product 10 and the minimum product height H _min of the press-formed product 10 in the first stretched portion 11a. ) Preferably satisfies the relationship of the following (Formula 1).

(H _max / H _min )> 1.20 Formula 1

Further, it is more preferable that the above expression 1 is satisfied not only in the first extending portion 11a described above but also in the second extending portion 11b and the curved portion 11c. That is, the ratio (H _max) of the maximum product height H _max of the press-formed product 10 and the minimum product height H _min of the press-formed product 10 from the first stretched portion 11 a to the curved portion 11 c and the second stretched portion 11 b. It is more preferable that / H _min ) satisfies the relationship of the following (formula 1).

(H _max / H _min )> 1.20 Formula 1

The maximum product height H _max of the press-formed product 10 means the product height at the position where the product height of the press-formed product 10 is the highest. The minimum product height H _min of the press-formed product 10 means the product height at the position where the product height of the press-formed product 10 is the lowest.

<Method for manufacturing press-formed products>
The press-formed product 10 shown in FIGS. 1 and 2 includes a first step of processing a blank into an intermediate product 20 shown in FIGS. 7A to 7C and FIG. 9, which will be described later, and the intermediate product 20 shown in FIGS. 1 and 2A. -It manufactures through the 2nd process of processing into the press-molded article 10 shown in FIG. 2C. In the manufacturing method of this embodiment, the intermediate product 20 is manufactured by blanking in the first step, and the press-formed product 10 is manufactured by bending the intermediate product 20 in the second step.

In the present specification, a portion of the intermediate product 20 shown in FIGS. 7A to 7C and 9 to be described later corresponding to the top plate portion 11 of the finished product (press-formed product 10) is referred to as an intermediate top plate portion 21. To do. Similarly, a portion of the intermediate product 20 corresponding to the vertical wall portion 12 of the finished product (press molded product 10) is referred to as an intermediate vertical wall portion 22, and a flange portion 13 of the finished product (press molded product 10) of the intermediate product 20 is formed. The corresponding portion is referred to as the intermediate flange portion 23. Further, as shown in FIGS. 7A and 7B, the vertical wall line length (intermediate top plate portion) which is the line length of the intermediate vertical wall portion 22 at the first molding position P ₁ in a cross section perpendicular to the first direction A _1. The length of the straight line between the R stop on the 21st side and the R stop on the intermediate flange portion 23 side) is defined by the first intermediate vertical wall line length d ₁ and the second molding position P as shown in FIGS. 7A and 7C. The vertical wall line length that is the line length in the cross section perpendicular to the first direction A ₁ of the intermediate vertical wall portion 22 in ₂ (between the R stop on the intermediate top plate portion 21 side and the R stop on the intermediate flange portion 23 side). (The length of the straight line) is the second intermediate vertical wall line length d ₂ and the forming height which is the height from the intermediate flange portion 23 to the intermediate top plate portion 21 at the first forming position P ₁ is the first forming height h _1, the height from the second forming position P ₂ intermediate flange section 23 in to the intermediate top panel section 21 formed The height referred to as the second forming height h _2.

Here, prior to describing the manufacturing method of the present embodiment, a conventional technique will be described for convenience of description. FIG. 5A is a side view showing an example of the intermediate product 120 according to the related art. FIG. 5B is a schematic sectional view of the intermediate product 120 at the _first molding position P ₁ in FIG. 5A. FIG. 5C is a schematic cross-sectional view of the intermediate product 120 at the _second molding position P ₂ in FIG. 5A. The cross-sectional view referred to here is a view showing a cross section perpendicular to the first direction A ₁ .

In the example shown in FIGS. 5A to 5C, in the range from the _first molding position P ₁ to the second molding position P ₂ of the intermediate product 120, the angle formed by the intermediate top plate portion 121 and the intermediate vertical wall portion 122 is The processing in the first step is performed so that it is vertical and the first molding height h ₁ and the second molding height h ₂ of the intermediate product 120 are the same. Further, the first molding height h ₁ is the same as the first product height H ₁ of the press-molded product 10 which is the finished product shown in FIG. 2B, and the first intermediate vertical wall of the intermediate product 120. The line length d _{1 is} also the same as the first vertical wall line length D ₁ of the press-formed product 10 shown in FIG. 2B. Therefore, the intermediate product 120 in FIG 5A~ Figure 5C, the shape of the first forming position P ₁ has become equivalent to the shape of the press-molded product 10 of the first molding position P _1. On the other hand, in the intermediate product 120 of FIGS. 5A to 5C, the second forming height h ₂ is different from the _second product height H ₂ of the press-formed product 10 shown in FIG. The intermediate vertical wall line length d ₂ is also different from the _second vertical wall line length D ₂ .

Therefore, in order to manufacture the press-formed product 10 as shown in FIG. 2 from the intermediate product 120 as shown in FIGS. 5A to 5C, the second intermediate vertical wall line shown in FIG. the length d _2, it is necessary to process to match the second vertical wall line length D ₂ of the press-molded product 10 shown in FIG. 2C. That is, it is necessary to perform bending back of the intermediate flange portion 123 as shown in FIG. 6 by processing in the second step and to newly form the flange portion 13 as the press-formed product 10 on the plate surface of the intermediate flange portion 123. . In addition, in FIG. 6, the cross-sectional shape of the press-formed product 10 after bending and stretching is shown by a broken line. When such processing is performed, a bending trace between the intermediate vertical wall portion 122 and the intermediate flange portion 123 is likely to remain on the vertical wall portion 12 of the press-formed product 10, which causes a deterioration in appearance quality.

Next, an example of a method for manufacturing the press-formed product 10 in this embodiment will be described. FIG. 7A is a side view showing the intermediate product 20 manufactured by the processing in the first step according to the embodiment of the present invention. FIG. 7B is a schematic cross-sectional view of the intermediate product 20 at the _first molding position P ₁ in FIG. 7A. FIG. 7C is a schematic cross-sectional view of the intermediate product 20 at the _second molding position P ₂ in FIG. 7A. The cross-sectional view referred to here is a view showing a cross section perpendicular to the first direction A ₁ .

As shown in FIGS. 7A to 7C, in the example of the intermediate product 20 of the present embodiment, the first molding height h ₁ and the second molding height h ₂ are the same. However, in the intermediate product 20 of the present embodiment, the cross-sectional shape at the _second molding position P ₂ shown in FIG. 7C is different from the cross-sectional shape of the conventional intermediate product 120 shown in FIG. 5C. More specifically, in the conventional intermediate product 120 shown in FIG. 5C, the angle formed by the intermediate top plate portion 21 and the intermediate vertical wall portion 22 at the second molding position P ₂ is vertical, and the second intermediate vertical wall line is formed. The length d ₂ is smaller than the second vertical wall line length D ₂ of the press-formed product 10 which is a finished product. On the other hand, in the example of the intermediate product 20 of the present embodiment illustrated in FIG. 7C, the intermediate vertical wall portion 22 is inclined with respect to the intermediate top plate portion 21 at the second molding position P ₂ , and the second intermediate vertical length is increased. The wall line length d ₂ is the same as the second vertical wall line length D ₂ of the press-formed product 10.

(Ratio of the intermediate vertical wall line length and d to the vertical wall line length D)
The second intermediate vertical wall line length d ₂ in the intermediate product 20 shown in FIG. 7C is the same as the second vertical wall line length D ₂ of the press-formed product 10, but the second intermediate vertical wall line length d _{2 is the same.} And the second vertical wall line length D ₂ do not necessarily have to be the same. Similarly, the first intermediate vertical wall line length d ₁ and the first vertical wall line length D ₁ do not necessarily have to be the same.

In the method for manufacturing a press-formed product according to this embodiment, the ratio (d ₁ / D ₁ ) of the first intermediate vertical wall line length d ₁ and the first vertical wall line length D ₁ is 0.80 to ₁ . You only need to fill 20. That is, 0.80 ≦ (d ₁ / D ₁ ) ≦ 1.20 is satisfied. When d ₁ / D ₁ is less than 0.80, the boundary between the intermediate flange portion 23 and the intermediate vertical wall portion 22 is located at the vertical wall portion 12 of the press-formed product 10 which is a finished product. Therefore, a pattern residue is likely to occur on the vertical wall portion 12 of the press-formed product 10.

It is more preferred lower limit of d ₁ / _{D 1} is 0.90, that is, _{d 1} / _D 1 ≧ 0.90. When d ₁ / D ₁ is 0.90 or more, the pattern remaining on the vertical wall portion 12 of the press-formed product 10 can be suppressed more stably.

On the other hand, when d ₁ / D ₁ > 1.20, that is, when d ₁ / D ₁ exceeds 1.20, the boundary between the intermediate vertical wall portion 22 and the intermediate flange portion 23 becomes the flange portion 13 of the press-formed product 10. Will be located. For this reason, a pattern residue is likely to occur on the flange portion 13 of the press-formed product 10.

The upper limit of d ₁ / D ₁ is more preferably 1.10. When d ₁ / D ₁ is 1.10 or less, it is possible to more stably suppress the pattern residue on the flange portion 13.

In the method of manufacturing a press molded article according to the present embodiment, the second intermediate vertical wall line length _{d 2} and a second ratio of the vertical wall line length _{D 2 (d} 2 / _{D 2)} is 0.80 It suffices to satisfy 1.20. That is, 0.80 ≦ (d ₂ / D ₂ ) ≦ 1.20 is satisfied. If d ₂ / D ₂ is less than 0.80, the boundary between the intermediate flange portion 23 and the intermediate vertical wall portion 22 will be located at the vertical wall portion 12 of the press-formed product 10 that is a finished product. Therefore, a pattern residue is likely to occur on the vertical wall portion 12 of the press-formed product 10. If d ₂ / D ₂ exceeds 1.20, the boundary between the intermediate vertical wall portion 22 and the intermediate flange portion 23 will be located at the flange portion 13 of the press-formed product 10. For this reason, a pattern residue is likely to occur on the flange portion 13 of the press-formed product 10.

In order to suppress the remaining pattern on the vertical wall portion 12 more stably, it is more preferable that d ₂ / D ₂ ≧ 0.90, that is, the lower limit of d ₂ / D ₂ is 0.90. In order to suppress the remaining pattern on the flange portion 13 more stably, it is more preferable that d ₂ / D ₂ ≦ 1.10, that is, the upper limit of d ₂ / D ₂ is 1.10.

The closer the value of d ₂ / D ₂ is to 1.0, the more preferable, and it is particularly preferable that d ₂ / D ₂ = 1.0. When the press-formed product 10 is manufactured from the intermediate product 20 of the present embodiment, the second intermediate vertical wall line length d ₂ is the same as the second vertical wall line length D ₂ , so that as shown in FIG. The vertical wall portion 12 of the press-formed product 10 can be formed only by performing bending processing on. That is, the bending back of the intermediate flange portion 23 as shown in FIG. 6 is not necessary, and the vertical wall portion 12 as the press-formed product 10 does not have a trace of bending between the intermediate vertical wall portion 22 and the intermediate flange portion 23. . Therefore, in the press molding method of the present embodiment, it is possible to suppress the occurrence of pattern residue on the vertical wall portion 12, and improve the appearance quality of the press molded product 10.

(Ratio of the second forming height h ₂ and the first forming height h ₁ )
In the method of manufacturing press-molded product 10 of the present embodiment, the second forming height _{h 2} from the first ratio of the forming height _{h 1} in the intermediate product 20 _(h 2 / _{h 1)} is 0.80 .20, that is, 0.80 ≦ (h ₂ / h ₁ ) ≦ 1.20 is satisfied. When h ₂ / h ₁ is less than 0.80, distortion is generated between the first molding position P ₁ and the second molding position P ₂ when the intermediate product 20 is bent in the second step. A stress is partially applied to the top plate portion 11. Therefore, wrinkles are likely to occur on the top plate portion 11 of the press-formed product 10.

Also, when h ₂ / h ₁ exceeds 1.20, similarly, when bending the intermediate product 20 in the second step, between the first molding position P ₁ and the second molding position P ₂ Distortion is likely to occur. Therefore, wrinkles are likely to occur on the top plate portion 11 of the press-formed product 10.

In order to suppress the wrinkles of the top plate portion 11 more stably, it is more preferable that the lower limit of h ₂ / h ₁ is 0.90, that is, h ₂ / h ₁ ≧ 0.90, and h ₂ / h ₁ Is more preferably 1.10, that is, h ₂ / h ₁ ≦ 1.10.

  In the method for manufacturing the press-formed product 10 according to the present embodiment, in the first step, processing is performed so as to obtain the intermediate product 20 that satisfies the above conditions, so that the press-formed product 10 is processed in the second step. It is possible to prevent wrinkles and pattern residue. Therefore, the appearance quality of the press-formed product 10 can be improved.

  The blank material is not particularly limited, but a steel plate is used, for example. Further, according to the press molding method of the present embodiment, it is possible to suppress the wrinkles of the top plate portion 11 and the pattern remaining on the vertical wall portion 12 even in the case of a high tensile strength material having high molding difficulty. Therefore, when a steel sheet having a tensile strength of 590 MPa or more is used as a blank material, the effect of improving the appearance quality becomes more remarkable.

The angle formed by the intermediate top plate portion 21 and the intermediate vertical wall portion 22 during the processing in the first step of the present embodiment is defined by the vertical wall line length of the press-formed product 10, the product height, the top plate portion 11 and the like. It is appropriately set according to the angle formed by the vertical wall portion 12 and the like. For example, at an arbitrary position P _n between the first molding position P ₁ and the second molding position P ₂ of the present embodiment in the press-formed product 10 shown in FIGS. The intermediate vertical wall line length d _n is less than or equal to the _second intermediate vertical wall line length d ₂ of the intermediate product 20 at the second molding position P ₂ . Arbitrary position _{P n} and the difference of the intermediate vertical wall line length in the second forming position _{P 2 |} d n -d _{2 |} to. Here, the intermediate product height _{h n} at an arbitrary position _{P n} of the intermediate product 20 shown in FIG. 7A-7C, the difference between the intermediate product height _{h 2} of the second forming position _{P 2 |} h n -h and _{that, | | 2 d n -d 2} |> | h n -h 2 | is.

Therefore, the width of the intermediate top plate portion 21 (the line length of the intermediate top plate portion 21 in the cross section perpendicular to the first direction A ₁ ) is the same between the arbitrary position P _n and the second molding position P _2. In the case of, the angle (internal angle) formed between the intermediate top plate portion 21 and the intermediate vertical wall portion 22 at an arbitrary position P _n is the intermediate top plate portion 21 and the intermediate vertical wall portion at the second molding position P ₂ . It is smaller than the angle (internal angle) with 22.

FIG. 9 is a schematic perspective view showing a part of the intermediate product 20 according to this embodiment. The perspective view of FIG. 9 shows not a whole intermediate product 20, but a part of the intermediate product 20 in the range from the _first molding position P ₁ to the second molding position P ₂ as shown in FIG. 7A. is there.

In the present embodiment, the first intermediate vertical wall line length d ₁ and the first vertical wall line length D ₁ are the same, and the second intermediate vertical wall line length d ₂ and the second vertical wall line length D ₁ are the same. ₂ is the same, and the example in which the processing in the first step is performed so that the first molding height h ₁ and the second molding height h ₂ are the same has been described. However, the present invention is not limited to this embodiment.

<Production equipment for press-formed products>
Next, the equipment for manufacturing a press-formed product according to the present invention will be described. As will be described later, the manufacturing facility 30 for the press-formed product 10 includes a first mold 40 that processes the blank 60 into the intermediate product 20, and a second mold 40 that processes the intermediate product 20 into the press-formed product 10. It has a mold 50. In the example described in the present embodiment, the first mold 40 is a drawing mold configured to perform a drawing process, and the second mold 50 is a bending mold configured to perform a bending process. It is a mold.

(First mold)
FIG. 10 is a schematic sectional view of the first mold 40 at the second molding position P ₂ of this embodiment. The first die 40 of the present embodiment encloses a punching die 41 arranged as an upper die, a punch 42 opposed to the punching die 41 arranged as a lower die, and a periphery of the punch 42. The blank holder 43 is arranged as described above. The processing die 41 has a recess 44 that meshes with the top of the punch 42. The concave portion 44 has a surface 44a having the same shape as the shape of the intermediate top plate portion 21 and a surface 44b having the same shape as the shape of the intermediate vertical wall portion 22 connected to the surface. Further, a surface 44c connected to the surface 44b is formed in a portion of the processing die 41 facing the blank holder 43. Since each of these surfaces 44a to 44c is formed in the processing die 41, the intermediate top plate portion 21, the intermediate vertical wall portion 22, and the intermediate flange of the intermediate product 20 are closed when the first die 40 is closed. The part 23 is molded. That is, the surfaces 44 a to 44 c of the processing die 41 correspond to the portion for forming the intermediate top plate portion 21, the portion for forming the intermediate vertical wall portion 22, and the portion for forming the intermediate flange portion 23, respectively.

  In the present specification, a portion of the first mold 40 for forming the intermediate top plate portion 21 is an intermediate top plate forming portion 44a, and a portion for forming the intermediate vertical wall portion 22 is an intermediate vertical wall forming portion 44b. A portion for forming the intermediate flange portion 23 is referred to as an intermediate flange forming portion 44c.

  When processing is performed using the first die 40 as described above, the processing die 41 and the blank holder 43 are lowered or punched while the blank 60 is held by the processing die 41 and the blank holder 43. By raising 42, the blank 60 is pushed into the recess 44 of the processing die 41 as shown in FIG. As a result, the blank 60 is processed into a shape that follows the shape of the recess 44 of the processing die 41, and the intermediate product 20 is manufactured.

FIG. 12 is a schematic cross-sectional view showing the processing die 41 of the first mold 40 at the first molding position P ₁ of this embodiment. In the present specification, as shown in FIGS. 12 and 10, a vertical wall line that is a line length of a section of the intermediate vertical wall forming portion 44b at the _first forming position P ₁ in a cross section perpendicular to the first direction A _1. The length (the length of a straight line between the R stop on the side of the intermediate top plate forming portion 44a and the R stop on the side of the intermediate flange forming portion 44c) is defined as the first intermediate vertical wall line length d ₁ ′, the second forming position P. the intermediate vertical wall molded portion 44b at the _2, blind R of the first vertical wall line length is a line length in a cross section perpendicular to the direction a ₁ (blind intermediate top plate forming portion 44a side R and the intermediate flange-forming portion 44c side Is a height from the intermediate flange forming portion 44c to the intermediate top plate forming portion 44a at the second intermediate vertical wall line length d ₂ ′ and the first forming position P ₁ . first forming height h ₁ 'and of the intermediate flange-forming portion of the second forming position P ₂ The height is formed height from 4c to the intermediate top plate forming portion 44a is referred to as a second forming height h _{2 '.}

The first intermediate vertical wall line length d ₁ , the first forming height h ₁ , the second intermediate vertical wall line length d ₂ , and the second intermediate product 20 obtained by processing with the first mold 40. The molding height h ₂ of the first mold 40 is the first intermediate vertical wall line length d ₁ ′, the first molding height h ₁ ′, the second intermediate vertical wall line length d ₂ ′, and It is equal to the second forming height h ₂ ′, respectively.

(Second mold)
FIG. 13 is a schematic sectional view of the second mold 50 at the second molding position P ₂ of this embodiment. The second mold 50 of the present embodiment includes a pad 51 arranged as an upper mold, a processing die 52 arranged for surrounding the pad 51 for bending, and an anvil 53 arranged as a lower mold. Is equipped with. The anvil 53 includes a surface 53a having the same shape as the shape of the top plate portion 11 of the press-formed product 10, a surface 53b having the same shape as the shape of the vertical wall portion 12 of the press-formed product 10 connected to the surface 53a, and the surface 53b. And a surface 53c connected to. Since the anvil 53 has these respective surfaces 53a to 53c, the top plate portion 11, the vertical wall portion 12, and the flange portion 13 of the press-formed product 10 are closed when the second mold 50 is closed. Molding is performed. That is, the surfaces 53a to 53c of the anvil 53 correspond to a portion for forming the top plate portion 11, a portion for forming the vertical wall portion 12, and a portion for forming the flange portion 13, respectively. In the present specification, a portion of the second mold 50 for molding the top plate portion 11 is a top plate molding portion 53a, a portion for molding the vertical wall portion 12 is a vertical wall molding portion 53b, and a flange portion 13. The portion to be molded is referred to as a flange molding portion 53c.

  When processing the intermediate product 20 using the second mold 50 as described above, the intermediate top plate portion 21 is positioned between the pad 51 and the top plate forming portion 53a of the anvil 53. The intermediate product 20 is placed on the intermediate product 20, and the processing die 52 is lowered as shown in FIG. 14 while the pad 51 is pressed to press the intermediate product 20. As a result, the intermediate product 20 is processed into a shape that follows the top plate molding portion 53a, the vertical wall molding portion 53b, and the flange molding portion 53c of the anvil 53, and the press molded product 10 is manufactured.

FIG. 15 is a schematic view showing the anvil 53 of the second mold 50 at the first molding position P ₁ of this embodiment. In the present specification, as shown in FIGS. 15 and 13, in a cross section of the second die 50 at the vertical wall forming portion 53b at the _first forming position P _1, which is perpendicular to the first direction A ₁ . The vertical wall line length that is the line length (the length of the straight line between the R stop on the top plate forming portion 53a side and the R stop on the flange forming portion 53c side) is defined as the first vertical wall line length D ₁ ′, the second Of the vertical wall forming portion 53b at the forming position P ₂ of the vertical wall line length (R stop on the top plate forming portion 53a side and R on the flange forming portion 53c side) which is a line length in a cross section perpendicular to the first direction A _1. (The length of the straight line between the stop) is the second vertical wall line length D ₂ ′, and the product height that is the height from the flange forming portion 53c to the top plate forming portion 53a at the first forming position P ₁ is first product height _{H 1} ', the second molding position the top plate forming portion 53a from the flange-forming portion 53c at _{P 2} The height Product Height a second product in the referred to as the height H _{2 '.}

The first vertical wall line length D ₁ , the first product height H ₁ , the second vertical wall line length D ₂ , and the second vertical wall line length D ₁ of the press-formed product 10 obtained by processing with the second mold 50. The product height H ₂ is defined by the first vertical wall line length D ₁ ′ of the second mold 50, the first product height H ₁ ′, the second vertical wall line length D ₂ ′, and the second vertical wall line length D ₁ ′. It is equal to the product height H ₂ ′.

As described above, the intermediate product 20 of the present embodiment has the ratio of the first intermediate vertical wall line length d ₁ to the first vertical wall line length D ₁ and the second intermediate vertical wall line length d ₂ to the second intermediate vertical wall line length d ₂ . The ratio of the vertical wall line length D _{2 and} the ratio of the second forming height h ₂ and the first forming height h ₁ satisfy 0.80 to 1.20, respectively. In other words, in the first mold 40 of the present embodiment, the ratio of the first intermediate vertical wall line length d ₁ ′ and the first vertical vertical wall line length D ₁ ′, the second intermediate vertical wall line length d ₁ ′. The ratio of ₂ ′ to the second vertical wall line length D ₂ ′ and the ratio of the second forming height h ₂ ′ and the first forming height h ₁ ′ satisfy the same conditions as those of the intermediate product 20. Thus, it is possible to suppress the generation of wrinkles and pattern residue of the press-formed product 10.

That is, in the press-molded article manufacturing facility 30 according to the present embodiment, the first mold 40 and the second mold 50 have the first intermediate vertical wall line length d ₁ ′ and the first vertical wall line length. The ratio of D ₁ ′ (d ₁ ′ / D ₁ ′) is 0.80 to 1.20. That is, 0.80 ≦ (d ₁ ′ / D ₁ ′) ≦ 1.20 is satisfied. When d ₁ ′ / D ₁ ′ is less than 0.80, pattern residue is likely to occur on the vertical wall portion 12 of the press-formed product 10. When d ₁ ′ / D ₁ ′ exceeds 1.20, a pattern residue is likely to occur on the flange portion 13 of the press-formed product 10.

In order to suppress the remaining pattern on the vertical wall portion 12 more stably, the lower limit of d ₁ ′ / D ₁ ′ is more preferably 0.90. In order to suppress the remaining pattern on the flange portion 13 more stably, the upper limit of d ₁ ′ / D ₁ ′ is more preferably 1.10.

Further, in the press-molded article manufacturing facility 30 according to the present embodiment, the first mold 40 and the second mold 50 have the second intermediate vertical wall line length d ₂ ′ and the second vertical wall line length. The ratio of D ₂ ′ (d ₂ ′ / D ₂ ′) is 0.80 to 1.20. That is, 0.80 ≦ (d ₂ ′ / D ₂ ′) ≦ 1.20 is satisfied. If d ₂ ′ / D ₂ ′ is less than 0.80, pattern residue is likely to occur on the vertical wall portion 12 of the press-formed product 10. When d ₂ ′ / D ₂ ′ exceeds 1.20, a pattern residue is likely to occur on the flange portion 13 of the press-formed product 10.

In order to suppress the remaining pattern on the vertical wall portion 12 more stably, the lower limit of d ₂ ′ / D ₂ ′ is more preferably 0.90. In order to suppress the pattern residue on the flange portion 13 more stably, the upper limit of d ₂ ′ / D ₂ ′ is more preferably 1.10.

Further, in the press-molded article manufacturing facility 30 according to the present embodiment, the first mold 40 has a ratio (h ₂ ′ /) of the second molding height h ₂ ′ and the first molding height h ₁ ′. h ₁ ′) is 0.80 to 1.20. That is, 0.80 ≦ (h ₂ ′ / h ₁ ′) ≦ 1.20 is satisfied. If h ₂ '/ h ₁ ' is less than 0.80, wrinkles are likely to occur on the top plate portion 11 of the press-formed product 10. Also, when h ₂ '/ h ₁ ' exceeds 1.20, wrinkles are likely to occur on the top plate portion 11 of the press-formed product 10. In order to suppress the wrinkles of the top plate portion 11 more stably, the lower limit of h ₂ ′ / h ₁ ′ is more preferably 0.90. Further, in order to suppress the wrinkles of the top plate portion 11 more stably, it is more preferable that the upper limit of h ₂ ′ / h ₁ ′ be 1.10.

  Although one embodiment of the present invention has been described above, the present invention is not limited to this example. It is obvious to those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea described in the claims, and as a matter of course, the technical scope of the present invention is also applicable to them. Be understood to belong to.

For example, in the above-described embodiment, the example in which the press-formed product 10 has a bilaterally symmetrical shape with the center position of the width of the top plate portion 11 as the axis of symmetry has been described, but the press-formed product 10 may have a bilaterally asymmetrical shape. For example, the vertical wall line lengths of the pair of vertical wall portions 12 in the cross section perpendicular to the first direction A ₁ as described above may be different from each other, or one vertical wall portion 12 and the top plate portion 11 may be different from each other. The angle formed may be different from the angle formed by the other vertical wall portion 12 and the top plate portion 11. Even in this case, the appearance quality of the press-formed product 10 can be improved if each vertical wall portion 12 satisfies the above-described ratio of the intermediate vertical wall line length to the vertical wall line length.

  In the above embodiment, the method for forming the press-formed product 10 in the first stretched portion 11a has been described, but the press-formed product in which the product height changes toward the curved portion 11c also in the second stretched portion 11b. If it is 10, the same molding method can be applied.

FIG. 16 is a schematic plan view of the press-formed product 10 as seen from a direction perpendicular to the plate surface of the top plate portion. In the example of FIG. 1, the first molding position P ₁ and the second molding position P ₂ are located in the first extending portion 11a. However, in the above-described embodiment, as shown in FIG. 16, at the third molding position P ₃ and the fourth molding position P ₄ located at the second extending portion 11b, the third molding position P _{3 at} the third molding position P ₃ is formed. the forming height _{h 3,} a third intermediate vertical wall line length _{d 3} and the third vertical wall line length _{D 3} of the fourth molding position _{P 4,} the fourth forming height _{h 4,} the fourth The intermediate vertical wall line length d ₄ and the fourth vertical wall line length D ₄ are such that d ₃ / D ₃ is 0.80 to 1.20, d ₄ / D ₄ is 0.80 to 1.20, and h ₄ / H ₃ may satisfy the relationship with 0.80 to 1.20.

Further, in the above-described embodiment, as shown in FIG. 16, the fifth molding height h ₅ and the fifth intermediate vertical wall line at the fifth molding position P ₅ located on the curved portion 11c of the press-formed product 10 are shown. The length d ₅ and the fifth vertical wall line length D ₅ may be replaced with the second forming height h ₂ , the second intermediate vertical wall line length d ₂ and the second vertical wall line length D ₂ , respectively. . Alternatively, the fifth forming height h ₅ , the fifth intermediate vertical wall line length d ₅ and the fifth vertical wall line length D ₅ are set to the fourth forming height h ₄ and the fourth intermediate vertical wall line length. to d ₄ and a fourth vertical wall line length D ₄ of it may be replaced, respectively.

  The shape of the press-formed product 10 is not limited to that described in the above embodiment. The press-formed product 10 may have a shape such that one end of the first stretched portion 11a and one end of the second stretched portion 11b are connected to each other via the curved portion 11c, such as an L shape. The press-formed product 10 further includes a third stretched portion (not shown) that is a portion extending in a third direction (not shown) such as a Y shape, and has one end of the first stretched portion 11a and a first stretched portion 11a. The shape in which one end of the second extending portion 11b and one end of the third extending portion are connected to each other via the curved portion 11c may be used. The press-formed product 10 is, for example, an automobile part including at least one of a T-shape, an L-shape, and a Y-shape in a plan view. Specifically, the press-formed product is, for example, a center pillar outer, a front pillar lower, a side panel outer, or the like.

That is, the above-described first direction may be replaced with the third direction, and also in this third direction, the press-formed product 10 having a shape in which the product height changes from the third stretched portion toward the curved portion 11c. Then, in the third direction, the same molding positions as the above-described first molding position P ₁ to fourth molding position P ₄ are set, and the method for manufacturing the press-formed product according to the above embodiment. Can be applied.

FIG. 17 is a schematic perspective view showing another example of the press-formed product 10 according to the above embodiment. The press-formed product 10 shown in FIG. 17 has the same overall structure as that of the press-formed product 10 shown in FIG. 1, but the first product height H ₁ and the second molding position P ₁ at the first molding position P ₁ are the same. The difference between P ₂ and the second product height H ₂ is smaller than that in the example of FIG. 1.

Further, in the method for manufacturing the press-formed product 10 of the above-described embodiment, the drawing process is performed in the first step, but the processing method in the first step is not limited to the drawing process. In the processing method in the first step, the ratio (d ₁ / D ₁ ) of the first intermediate vertical wall line length d ₁ and the first vertical wall line length D ₁ satisfies 0.80 to 1.20, intermediate vertical wall line length _{d 2} 2 and the second ratio of the vertical wall line length _{D 2 (d} 2 / _{D 2)} satisfies the 0.80 to 1.20, the second forming height _{h 2} first It suffices that the processing method is such that the intermediate product 20 in which the ratio (h ₂ / h ₁ ) of the molding height h ₁ is satisfying 0.80 to 1.20. The processing method in the second step is not limited to bending.

In the manufacturing facility 30 for the press-formed product 10 of the above-described embodiment, the first mold 40 is a drawing mold configured to perform drawing, but the first mold 40 is a drawing mold. Not limited. The first mold 40 has a ratio (d ₁ ′ / D ₁ ′) of the first intermediate vertical wall line length d ₁ ′ and the first vertical wall line length D ₁ ′ of 0.80 to 1.20. The second intermediate vertical wall line length d ₂ and the second vertical wall line length D _{2 have} a ratio (d ₂ ′ / D ₂ ′) of 0.80 to 1.20 and the second molding height. It suffices that the ratio (h ₂ ′ / h ₁ ′) of h ₂ ′ and the first molding height h ₁ ′ be configured to satisfy 0.80 to 1.20. Further, the second mold 50 is not limited to the bending mold configured to perform the bending process.

  A molding simulation (software used: J-STAMP) of a press-molded product having a shape as shown in FIG. 1 was performed, and the appearance of the press-molded product was evaluated. In the molding simulation, the intermediate product satisfying the conditions of the following Table 1 and the press-formed product (the first product height is 80 mm, the second product height is 96 mm) are drawn as the first step. The processing conditions were processing and bending as the second step. The blank is a steel plate having a tensile strength of 980 MPa.

  The appearance quality is evaluated by observing the top plate part, vertical wall part, and flange part of the press-molded product of the analysis model with shading display, and determining the occurrence of wrinkles and pattern residuals by sensory evaluation. I was broken.

  As shown in Table 1, in this simulation, No. 1 according to the example of the present invention was used. In the analytical models 1, 2, 4, 6 and 8, good results were obtained with no pattern remaining on the vertical wall portion and the flange portion.

On the other hand, No. 1, which is a manufacturing condition in which d ₁ / D ₁ and d ₂ / D ₂ exceed 1.20. In the analysis model of No. 3, a pattern residue was generated on the flange portion, and the appearance quality was deteriorated. In addition, No. 1, which is a manufacturing condition such that d ₁ / D ₁ and d ₂ / D ₂ are less than 0.80. In the analysis model of No. 5, a pattern residue was generated on the vertical wall portion, and the appearance quality was deteriorated. Moreover, No. 2 which is a manufacturing condition such that h ₂ / h ₁ exceeds 1.20. No. 7, which is a manufacturing condition such that the analysis model of No. 7 and h ₂ / h ₁ is less than 0.80. In the analysis model of No. 9, wrinkles were generated in the top plate portion and the appearance quality was deteriorated.

In addition, No. 1, which is a manufacturing condition such that d ₁ / D ₁ and d ₂ / D ₂ are less than 0.80. In the analysis model of 10, the pattern quality was generated on the vertical wall portion, and the appearance quality was deteriorated.

According to the result of this simulation, pattern remaining and wrinkles are caused by performing drawing processing such that d ₁ / D ₁ , d ₂ / D ₂ , and h ₂ / h ₁ are 0.80 to 1.20, respectively. It is possible to suppress the occurrence of

  INDUSTRIAL APPLICATION This invention can be utilized for manufacture of the press molded article of a motor vehicle.

10 Press-formed product 11 Top plate portion 11a First extended portion 11b Second extended portion 11c Curved portion 12 Vertical wall portion 13 Flange portion 20 Intermediate product 21 Intermediate top plate portion 22 Intermediate vertical wall portion 23 Intermediate flange portion 30 Manufacturing facility 40th 1 die 41 processing die 42 punch 43 blank holder 44 recess 44a intermediate top plate forming part 44b intermediate vertical wall forming part 44c intermediate flange forming part 50 second mold 51 pad 52 processing die 53 anvil 53a top plate forming part 53b Vertical wall forming portion 53c Flange forming portion 60 Blank D ₁ First vertical wall line length D ₁ ′ of press-formed product First vertical wall line length d _{1 of} second mold _First intermediate vertical wall of intermediate product line length d ₁ second vertical wall line length of 'the first second vertical wall line length of the mold first intermediate vertical wall line length D ₂ press molded product of D _2' second mold d ₂ the second intermediate vertical wall line of the intermediate product d ₂ 'first The mold second intermediate vertical wall line length H ₁ press molded product of 1 product height H ₁ 'first forming height h of the first product height h ₁ an intermediate product of the second mold ₁ second shaping 'of the first mold first second product of the height of the forming height H ₂ press-molded product of H _2' second second mold product height h ₂ intermediate products Height h ₂ ′ Second molding height P _{1 of} first mold P ₁ First molding position P ₂ Second molding position A ₁ First direction A ₂ Second direction

Claims (3)

A top plate portion that extends in a first direction and a second direction, and a portion that extends in the first direction and a portion that extends in the second direction are connected via a curved portion, and a vertical portion that is connected to the top plate portion. Having a wall portion and a flange portion connected to the vertical wall portion,
When an arbitrary position in the first direction is referred to as a first molding position and a position closer to the curved portion than the first molding position is referred to as a second molding position, the first molding position is referred to as the above. A method of manufacturing a press-formed product, wherein the height from the flange portion to the top plate portion changes from a _first product height H ₁ to a second product height H ₂ toward a _second molding position. ,
A portion corresponding to the top plate portion of the intermediate product is an intermediate top plate portion, a portion corresponding to the vertical wall portion of the intermediate product is an intermediate vertical wall portion, and a portion corresponding to the flange portion of the intermediate product is an intermediate flange portion. ,
The line length of the cross section of the intermediate vertical wall portion in the first molding position perpendicular to the first direction is defined as a first intermediate vertical wall line length d ₁ , and the intermediate vertical wall portion in the second molding position. Of the cross section perpendicular to the first direction is the second intermediate vertical wall line length d ₂ , and the height from the intermediate flange portion to the intermediate top plate portion at the first molding position is the first. Of the molding height h _{1 of} the intermediate flange portion to the intermediate top plate portion at the second molding position is the second molding height h ₂ , and the vertical wall portion at the first molding position is , A line length of a cross section perpendicular to the first direction is a first vertical wall line length D ₁ , and a line length of a cross section of the vertical wall portion at the second molding position is perpendicular to the first direction. If it is called the _second vertical wall line length D ₂ ,
By processing the blank,
First intermediate vertical wall line length d ₁ / first vertical wall line length D ₁ : 0.80 to 1.20,
The second intermediate vertical wall line length _{d 2} / second vertical wall line length _D 2: 0.80 to 1.20,
Second forming height _{h 2} / first forming height _h 1: 0.80 to 1.20,
A first step of manufacturing the intermediate product satisfying the above conditions;
A second step of manufacturing the press-formed product by processing the intermediate product;   The method for manufacturing a press-formed product according to claim 1, wherein the blank is a steel plate having a tensile strength of 590 MPa or more. A manufacturing facility for a press-formed product having a top plate part, a vertical wall part connected to the top plate part, and a flange part connected to the vertical wall part,
A first mold for molding a blank into an intermediate product;
A second mold for forming the intermediate product into the press-formed product,
The second mold is
A portion that extends in the first direction and the second direction, and that connects the portion extending in the first direction and the portion extending in the second direction via a curved portion, which is a portion for forming the top plate portion. Top plate molding part,
A vertical wall forming portion that is a portion for forming the vertical wall portion,
A flange forming part which is a part for forming the flange part,
When an arbitrary position in the first direction is referred to as a first molding position and a position closer to the curved portion than the first molding position is referred to as a second molding position, the first molding position is referred to as the above. To the second molding position, the height from the flange molding portion to the top plate molding portion changes from the _first product height H ₁ ′ to the second product height H ₂ ′,
A portion corresponding to the top plate portion of the intermediate product is an intermediate top plate portion, a portion corresponding to the vertical wall portion of the intermediate product is an intermediate vertical wall portion, and a portion corresponding to the flange portion of the intermediate product is an intermediate flange. If you call it a department,
The first mold is
An intermediate top plate forming part which is a part for forming the intermediate top plate part,
An intermediate vertical wall forming part that is a part for forming the intermediate vertical wall part,
And an intermediate flange forming part which is a part for forming the intermediate flange part,
A line length of a cross section of the intermediate vertical wall forming portion in the first forming position perpendicular to the first direction is defined as a first intermediate vertical wall line length d ₁ ′, and an intermediate vertical length in the second forming position. A line length of a cross section of the wall forming portion perpendicular to the first direction is defined as a second intermediate vertical wall line length d ₂ ′, from the intermediate flange forming portion at the first forming position to the intermediate top plate forming portion. Is the first forming height h ₁ ′, the height from the intermediate flange forming part to the intermediate top plate forming part at the second forming position is the second forming height h ₂ ′, 1 of the vertical wall molding portion at the molding position, the line length of the cross section perpendicular to the first direction is a first vertical wall line length D ₁ ′, and the vertical wall molding portion at the second molding position, When the line length of the cross section perpendicular to the first direction is referred to as a _second vertical wall line length D ₂ ′,
The first mold and the second mold are
First intermediate vertical wall line length d ₁ ′ / first vertical wall line length D ₁ ′: 0.80 to 1.20,
Second intermediate vertical wall line length d ₂ ′ / second vertical wall line length D ₂ ′: 0.80 to 1.20,
Second molding height h ₂ ′ / first molding height h ₁ ′: 0.80 to 1.20,
Equipment for manufacturing press-formed products that is configured to meet the requirements.

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