CN110799278B - Press molding method - Google Patents
Press molding method Download PDFInfo
- Publication number
- CN110799278B CN110799278B CN201880041949.2A CN201880041949A CN110799278B CN 110799278 B CN110799278 B CN 110799278B CN 201880041949 A CN201880041949 A CN 201880041949A CN 110799278 B CN110799278 B CN 110799278B
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- Prior art keywords
- wall portion
- forming
- top plate
- wall
- press
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/26—Deep-drawing for making peculiarly, e.g. irregularly, shaped articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
- B21D24/16—Additional equipment in association with the tools, e.g. for shearing, for trimming
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D28/00—Shaping by press-cutting; Perforating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
Abstract
A press-forming method according to the present invention is a method of press-forming a T-shaped member (1), the T-shaped member (1) having: a top plate part (3) formed by connecting the vertical side part (9) and the horizontal side part (11) through a connecting side part (13); a wall portion (5) formed on the lateral side portion (11) from the vertical side portion (9) of the top plate portion (3) via the connecting side portion (13); and a flange portion (7) formed continuously with the lower end of the wall portion (5), the press-forming method including: a first forming step of drawing and forming an intermediate member (21), the intermediate member (21) having a convex portion (15) formed at a connecting side portion (13); a trimming step of trimming the intermediate-shaped member (21) to obtain a trimmed member (41); and a 2 nd molding step of molding the trim member (41) into a T-shaped member (1) having a desired shape by profiling, wherein the 2 nd molding step crushes the convex portion (15) and causes the material to flow into the wall portion (5a) continuous from the connecting side portion (13).
Description
Technical Field
The present invention relates to a press-forming method, and more particularly to a press-forming method for manufacturing an automotive (automotive) T-shaped component (part) having a T-shape in plan view.
Background
When a T-shaped member such as a cross member (cross member) in an automobile member is press-formed using a high-strength steel sheet (high-strength steel sheet) having a tensile strength (tensile strength) of 590MPa or more, there is a problem in that: wrinkles (crimples) and cracks (fracture) are produced simultaneously during the forming process. As a technique for press-forming a T-shaped member for an automobile such as this, for example, patent document 1 discloses a method for cold press-forming a center pillar (center pillar) using a high-strength steel sheet, the center pillar having a shape in which two vertical edges (vertical top portions) of the T-shape are connected to each other in an opposed manner.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2016 + 2560
Disclosure of Invention
Problems to be solved by the invention
However, in the press forming method disclosed in patent document 1, since the target member is a center pillar and the height of the wall (wall section) is low (the forming depth is shallow), wrinkles may occur at the lateral side (horizontal top section) of the T (short side portion of the top plate (top section) of the T-root) (fig. 9 of patent document 1), but wrinkles or cracks are less likely to occur at the vertical side (vertical top section) of the T (long side portion of the top plate of the T-root). However, the member such as the cross beam according to the present application has the following problems: since the wall height is high (the molding depth is deep), wrinkles are generated in the vertical side portions of the T-shaped root portions, and cracks are generated in the connecting portions between the vertical wall portions of the T-shaped root portions and the flange portions.
The present invention has been made in view of the above problems, and an object thereof is to provide a press forming method including: when a T-shaped component for an automobile having a T-shape, such as a cross member, is press-formed using a high-strength steel sheet, the T-shaped component can be manufactured while suppressing the occurrence of wrinkles and cracks.
Means for solving the problems
In order to solve the above-described problems and achieve the object, a press forming method according to the present invention is a method of press forming a T-shaped member, the press forming method including: a first forming step of forming an intermediate-shaped member (pressed-sheet part) from a blank (blank) by drawing (deep drawing); a trimming step of trimming (trimming) the intermediate shape member to obtain a trimmed member; and a 2 nd molding step of molding the trim member into the T-shaped member having a target shape by means of profiling (crash forming), wherein the intermediate-shaped member molded in the 1 st molding step includes: a T-shaped top plate portion in which the vertical side portion and the horizontal side portion are connected together by a connecting side portion (joining top portion); a wall portion (wall portion) formed continuously from a longitudinal edge portion of the top plate portion; a wall portion formed continuously from the lateral side portion of the top plate portion on the opposite side of the longitudinal side portion direction; a wall portion formed continuously from the top plate portion at the connecting side portion; and a flange portion (flange portion) formed continuously with lower ends of the wall portions, the intermediate shape member further having: a convex portion formed on a longitudinal side of a connecting side portion of the top plate portion; and a curved R-chamfered portion (bending R-portion) that is formed by raising a bottom R-chamfered portion (bottom R-portion) upward, the bottom R-chamfered portion connecting a wall portion formed continuously with the connecting side portion and a flange portion of a lower end of the wall portion, the trimming step trimming an unnecessary portion from the intermediate shape member so as to be a T-shaped member of the target shape in the 2 nd molding step, wherein the unnecessary portion includes: a portion of the flange portion; a wall portion formed continuously from a lateral side portion of the top plate portion and formed only on an opposite side to a longitudinal side portion direction; and a flange portion at a lower end of the wall portion, wherein the 2 nd forming step crushes the convex portion and the curved R chamfered portion to cause a material to flow into the wall portion continuous with the connecting side portion to form the wall portion into a target shape.
In the above-described press forming method according to the present invention, the cross-sectional shape of the convex portion (convex portion) perpendicular to the longitudinal direction of the side wall portion is a shape that is continuously curved so as to protrude from a wall portion formed continuously on the side of the side wall portion of the connecting side portion, via a ridge portion (ridge portion) connected to the wall portion.
Effects of the invention
In the present invention, the following are provided: a first forming step of forming a blank into an intermediate member by drawing; a trimming step of trimming the intermediate member to obtain a trimmed member; and a 2 nd molding step of molding the trim member into the T-shaped member having a target shape by profile molding, wherein the intermediate-shaped member molded in the 1 st molding step includes: a T-shaped top plate part formed by connecting the vertical side part and the horizontal side part together through a connecting side part; a wall portion formed continuously from a longitudinal edge portion of the top plate portion; a wall portion formed continuously from a lateral side portion of the top plate portion on an opposite side to the longitudinal side portion; a wall portion formed continuously from the top plate portion at the connecting side portion; a flange portion formed continuously with the lower ends of the wall portions; a convex portion formed on a longitudinal side of a connecting side portion of the top plate portion; and a curved R chamfered portion formed by raising a bottom R chamfered portion upward, the bottom R chamfered portion connecting a wall portion formed continuously with the connecting side portion and a flange portion of a lower end of the wall portion, the trimming step trimming an unnecessary portion from the intermediate shaped member so as to be a T-shaped member in the target shape in the 2 nd molding step, wherein the unnecessary portion includes: a portion of the flange portion; a wall portion formed continuously from a lateral side portion of the top plate portion and formed only on an opposite side to a longitudinal side portion direction; and a flange portion at a lower end of the wall portion, wherein the 2 nd forming step crushes the convex portion and the curved R chamfered portion to suppress the occurrence of wrinkles at the connecting side portion, and can form the T-shaped member into a target shape by flowing a material from the convex portion formed at the connecting side portion into the wall portion to prevent a crack from occurring from the wall portion to the flange portion.
Drawings
Fig. 1 is a view showing an intermediate member and a trim member for press-molding a T-shaped member having a target shape according to the present embodiment (where (a) is the intermediate member, (b) is the trim member, and (c) is the T-shaped member having the target shape).
Fig. 2 is a diagram illustrating a portion where wrinkles occur and a portion where cracks occur when a T-shaped member to be subjected to the present invention is formed by conventional drawing.
Fig. 3 is a diagram illustrating the shape of a blank for forming an intermediate member by drawing in the first forming step in the press forming method according to the present embodiment.
Fig. 4 is a diagram illustrating a die used for forming an intermediate member by drawing in the 1 st forming step in the press forming method according to the present embodiment.
Fig. 5 is a diagram illustrating a punch (punch) used in the first forming step of the press forming method according to the present embodiment (where ((a) is a side view (width direction), (b) is a side view (length direction), and (c) is a plan view).
Fig. 6 is a diagram illustrating a die used for forming a T-shaped member having a target shape by profile forming in the 2 nd forming step in the press forming method according to the present embodiment.
Detailed Description
An embodiment of the press forming method according to the present invention will be described below. The present invention is not limited to the present embodiment.
The press-forming method according to the present embodiment is a press-forming method for forming a T-shaped member 1 into a target shape as shown in fig. 1 (c), the press-forming method including: a first forming step of forming the blank into an intermediate member 21 shown in fig. 1 (a) by drawing; a trimming step of trimming the intermediate shaped member 21 to form a trimmed member 41 shown in fig. 1 (b); and a 2 nd forming step of forming the trim member 41 into the T-shaped member 1 having the target shape shown in fig. 1 (c) by the profile forming. Hereinafter, first, the T-shaped member 1 to be molded will be described, and then, the press molding method according to the present embodiment will be described. In the following description, the same reference numerals are given to parts having the same functions, and overlapping of the description is avoided.
T-shaped component 1
As shown in fig. 1 (c), the T-shaped member 1 includes a T-shaped top plate 3, a wall portion 5 continuous from the top plate 3, and a flange portion 7 continuous from the wall portion 5, the top plate 3 includes a vertical side portion 9 and a horizontal side portion 11, and the vertical side portion 9 and the horizontal side portion 11 are connected by a connecting side portion 13. Here, as shown in fig. 1 (c), the connecting side portion 13 is a portion having a shape in which both side edges (side edges) are bent.
The wall portion 5 is formed continuously from the vertical side portion 9 of the top plate portion 3 to the horizontal side portion 11 via the ridge portion 17 via the connecting side portion 13. The flange 7 is continuously formed from the lower end of the wall 5 through the bottom R chamfered portion 19.
< reason why wrinkles and cracks can be suppressed at the same time >
When a T-shaped member 1 having a deep molding depth such as a cross beam is drawn and molded by a single process using a high-strength steel sheet having a tensile strength of 590MPa or more, wrinkles may be generated in the connecting side portion 13 of the top plate portion 3 and cracks may be generated from the wall portion 5b continuing to the connecting side portion 13 via the ridge line portion 17b to the flange portion 7b as shown in fig. 2, and it is difficult to perform press molding with reduced molding defects.
In the press-forming method according to the present embodiment, the T-shaped member 1 can be press-formed while suppressing both wrinkles and cracks for the following reason.
In the first molding step 1, the convex portion 15 is formed so that excess material (residual material) is positively generated at the connecting side portion 13 of the intermediate shaped member 21 (fig. 1 a), whereby excess material (excess metal) during molding can be discharged and wrinkles can be prevented from being generated at the T-shaped connecting side portion 13.
In the subsequent trimming step, the unnecessary portion is trimmed from the intermediate shape member 21 (fig. 1 (b)) so as to be in the target shape in the 2 nd molding step, whereby the material is likely to flow into the wall portion 5a from the convex portion 15 provided to the intermediate shape member 21 in the 2 nd molding step.
Then, in the 2 nd molding step, the convex portion 15 is molded so as to be crushed, whereby the material flows from the convex portion 15 into the wall portion 5a, and cracks are prevented from occurring from the wall portion 5b to the flange portion 7b of the T-shaped member 1 ((c) of fig. 1).
In the press molding method according to the present embodiment, the first molding step 1 is a step of molding the material by: since the die chamfer (die R) of the bottom R chamfered portion 19a connecting the wall portion 5a and the flange portion 7a is enlarged (rounded off) as compared with the die chamfer of the bottom R chamfered portion 19b of the target shape (fig. 1 (c)) (fig. 1 (b)), the material can be caused to flow into the bottom R chamfered portion 19a thus enlarged in the 2 nd molding step, and the occurrence of cracks can be further prevented.
< Press Molding method >
Next, the first forming step, the trimming step, and the second forming step of the press forming method according to the present embodiment will be described.
(1 st Molding Process)
In the 1 st forming step, the blank is formed into an intermediate member 21 by drawing (fig. 1 (a)), and the intermediate member 21 includes: a T-shaped top plate 3; a wall portion 5 formed continuously from the top plate portion 3; a flange portion 7 formed continuously with the lower end of the wall portion 5; and the convex portion 15 formed on the vertical side portion 9 side of the connecting side portion 13 of the top plate portion 3, the blank 31 is drawn by using, for example, a die 39 having a punch 33, a die 35, and a blank holder (blank holder)37 shown in fig. 4, and setting the positional relationship between the blank 31 and the punch 33 shown in fig. 3.
As shown in fig. 1 (a), the wall portion 5 is constituted by: a wall portion 5c formed continuously from the longitudinal edge portion 9 of the top plate portion 3; a wall portion 5d formed continuously from the lateral side portion 11 of the top plate portion 3 on the longitudinal side portion 9 side; a wall portion 5a formed continuously from the connecting side portion 13 of the top plate portion 3; and a wall portion 5e formed continuously from the lateral side portion 11 on the opposite side to the longitudinal side portion 9.
The vertical side 9 side of the connecting side 13 is a portion of the connecting side 13 close to the vertical side 9. The convex portion 15 is formed on the vertical side portion 9 side of the connecting side portion 13 and is curved so as to protrude upward, and as shown in fig. 5, the convex portion 15 is formed using a punch 33, and the punch 33 is provided with a convex forming portion 33a having a shape curved so as to protrude upward at a portion corresponding to the connecting side portion 13.
Here, the cross-sectional shape of the convex portion 15 perpendicular to the longitudinal direction of the vertical side portion 9 may be a shape that is continuous from the wall portion 5a via a ridge line portion 17a connected to the wall portion 5a and is curved convexly, and the wall portion 5a may be formed continuously from the vertical side portion 9 side of the connecting side portion 13.
In order to prevent the trim member 41 from interfering with the punch 51 (see fig. 6) and floating up and being displaced from the die (tool of press) in the 2 nd molding step, a curved R chamfered portion 19c is formed in the bottom R chamfered portion 19a where the wall portion 5a continuous from the convex portion 15 and the flange portion 7a are connected (fig. 1 (b)). Here, for example, by setting the die chamfer of the bottom R chamfered portion 19a to be larger than the die chamfer of the bottom R chamfered portion 19b of the target shape, the curved R chamfered portion 19c can be formed to be raised upward from the bottom R chamfered portion 19 b.
The intermediate member 21 shown in fig. 1 (a) is further formed with: a bellows-shaped wall portion 5e continuous to the opposite side of the lateral side portion 11 of the top plate portion 3 in the direction of the longitudinal side portion 9; and a flange portion 7d continuous from the wall portion 5e, but the wall portion is not continuously formed at the left and right end portions 11a of the lateral side portion 11.
This is for: when the intermediate member 21 is drawn and formed in the first forming step 1, the portion of the blank 31 corresponding to the flange portion 7d is sandwiched between the die 35 and the blank holder 37 (fig. 4), thereby suppressing the occurrence of wrinkles in the lateral side portions 11 and preventing the occurrence of cracks in the vicinity of the end portions 11a of the lateral side portions 11.
Further, the shape of the blank 31 (see fig. 3) is set by shearing the steel sheet as follows: the wall portion 5e and the flange portion 7d are formed without forming a wall portion continuous from the end portion 11 a.
Trimming Process
The trimming step is a step of trimming the intermediate shape member 21 to obtain a trimmed member 41 (fig. 1 (b)), and trims an unnecessary portion from the intermediate shape member 21 so as to obtain the target shape in the 2 nd molding step. In order to obtain the T-shaped member 1 molded in the 2 nd molding step into the target shape without further trimming, the intermediate member 21 is trimmed at the following three portions: end portions 11a on both left and right sides of the lateral side portion 11; a portion of the lateral side portion 11 that is formed only on the side where the wall portion 5e and the flange portion 7d on the opposite side in the direction of the longitudinal side portion 9 are continuous; and side end portions 7c on both left and right sides when the flange portion 7 is viewed in plan.
However, in the trimming step of the press molding method according to the present embodiment, the portion may be trimmed to form the target shape after the 2 nd molding step.
(2 nd Molding Process)
The 2 nd forming step is a step of forming the trim member 41 (fig. 1 b) into the T-shaped member 1 (fig. 1 c) of the target shape by profile forming using a die 55 having a punch 51 and a die 53 (a die 53a and a die 53b) shown in fig. 6, and is a step of crushing the convex portion 15 of the trim member 41 to flow the material into the wall portion 5a and forming the bent R chamfered portion 19c without causing cracks.
In the 2 nd molding step, in order to facilitate the flow of the material from the convex portion 15 into the wall portion 5a, for example, the following steps are required: the protruding portion 15 of the top plate portion 3 of the trimming member 41 is not pressed by the pad (pad), but the remaining portions (the vertical side portions 9 and the horizontal side portions 11) are pressed by the pad, and the punch 51 and the die 53 perform the profile forming.
As described above, according to the press forming method of the present embodiment, even when a high-strength steel sheet having a tensile strength of 590MPa or more is used, it is possible to press form the T-shaped member 1 having a large forming depth while suppressing wrinkles and avoiding cracks.
In the above description, the convex portion 15 of the intermediate member 21 is formed so as to continuously protrude and curve from the wall portion 5a via the ridge line portion 17a in the connecting side portion 13, but the shape of the convex portion 15 is not limited thereto, and may be formed so as to protrude inward and upward from the ridge line portion 17a in the connecting side portion 13 as long as the material can flow from the convex portion 15 into the wall portion 5a in the profiling of the edge-trim member 41 in the 2 nd molding step.
In the above description, as shown in fig. 1 (c), the T-shaped member 1 has a shape in which the longitudinal sides of two T-shapes are connected to face each other at both ends in the longitudinal direction, but a T-shaped member having a T-shape at one end in the longitudinal direction may be press-formed in the present invention.
Industrial applicability
According to the present invention, there can be provided the following press forming method: a T-shaped member for an automobile having a T-shape such as a cross member is press-formed using a high-strength steel sheet, and can be manufactured while suppressing the occurrence of wrinkles and cracks.
Description of the reference symbols
1: t-shaped component
3: roof board part
5. 5a, 5b, 5c, 5d, 5 e: wall part
7. 7a, 7b, 7 d: flange part
7 c: side end part
9: longitudinal edge part
11: transverse edge part
11 a: end part
13: connecting edge
15: convex part
17. 17a, 17 b: edge line part
19. 19a, 19 b: bottom R chamfer
19 c: curved R chamfer
21: intermediate shaped component
31: blank material
33: punch head
33 a: convex shape forming part
35: punching die
37: blank holder
39: die set
41: trimming component
51: punch head
53. 53a, 53 b: punching die
55: die set
Claims (2)
1. A press-molding method for press-molding a T-shaped member, characterized in that,
the press molding method includes:
a first forming step of forming a blank into an intermediate member by drawing;
a trimming step of trimming the intermediate member to obtain a trimmed member; and
a 2 nd forming step of forming the trimmed member into the T-shaped member having a desired shape by profile forming,
the intermediate member molded in the first molding step 1 includes: a T-shaped top plate part formed by connecting the vertical side part and the horizontal side part together through a connecting side part; a wall portion formed continuously from a longitudinal edge portion of the top plate portion; a wall portion formed continuously from the lateral side portion of the top plate portion to the longitudinal side portion; a wall portion formed continuously from the connecting side portion of the top plate portion; a wall portion formed continuously from the lateral side portion of the top plate portion on the opposite side of the longitudinal side portion direction; and a flange portion formed continuously with the lower ends of the wall portions,
the intermediate shape member further has: a convex portion formed on a longitudinal side of a connecting side portion of the top plate portion; and a curved R chamfered portion formed by raising upward a bottom R chamfered portion connecting a wall portion formed continuously with the connecting side portion and a flange portion at a lower end of the wall portion,
the trimming step of trimming an unnecessary portion from the intermediate shape member so as to form a T-shaped member having the target shape in the 2 nd molding step, wherein the unnecessary portion includes: a portion of the flange portion; a wall portion formed continuously from a lateral side portion of the top plate portion and formed only on an opposite side to a longitudinal side portion direction; and a flange portion at the lower end of the wall portion,
the second forming step 2 crushes the convex portion and the curved R chamfered portion, and forms a material into a wall portion continuous with the connecting side portion to a desired shape.
2. The press-forming method according to claim 1,
the convex portion has a cross-sectional shape perpendicular to the longitudinal direction of the vertical side portion, which is continuously formed from the wall portion on the vertical side of the connecting side portion, and is continuously curved so as to protrude from the wall portion via the ridge portion connected to the wall portion.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017-132445 | 2017-07-06 | ||
| JP2017132445A JP6690605B2 (en) | 2017-07-06 | 2017-07-06 | Press molding method |
| PCT/JP2018/016818 WO2019008880A1 (en) | 2017-07-06 | 2018-04-25 | Press forming method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110799278A CN110799278A (en) | 2020-02-14 |
| CN110799278B true CN110799278B (en) | 2021-09-14 |
Family
ID=64949909
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880041949.2A Active CN110799278B (en) | 2017-07-06 | 2018-04-25 | Press molding method |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP6690605B2 (en) |
| KR (1) | KR102300153B1 (en) |
| CN (1) | CN110799278B (en) |
| MX (1) | MX2019015393A (en) |
| WO (1) | WO2019008880A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113997010B (en) * | 2020-07-27 | 2023-03-21 | 苏州铭峰精密机械有限公司 | Anti-cracking forming method for high-strength plate forming workpiece |
| CN117751020A (en) | 2021-09-03 | 2024-03-22 | 日本制铁株式会社 | Structural member and method for manufacturing same |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2551022B2 (en) * | 1987-09-04 | 1996-11-06 | トヨタ自動車株式会社 | Drawing method and press die therefor |
| CN100574919C (en) * | 2006-12-27 | 2009-12-30 | 比亚迪股份有限公司 | A kind of elimination has the method for the platy partial drape of sunk area |
| JP2008200709A (en) * | 2007-02-20 | 2008-09-04 | Nissan Motor Co Ltd | Apparatus and method for manufacturing press-formed product and press formed product |
| JP5281519B2 (en) * | 2009-08-26 | 2013-09-04 | トヨタ自動車株式会社 | Press forming method |
| ES2667027T3 (en) * | 2010-05-25 | 2018-05-09 | Nippon Steel & Sumitomo Metal Corporation | Method for forming a metal element that has excellent shape freezing properties |
| EP2524740A1 (en) * | 2011-05-19 | 2012-11-21 | Nippon Steel Corporation | Press-forming method of component having L shape |
| MY172070A (en) * | 2012-09-27 | 2019-11-13 | Nippon Steel Corp | Method for producing center pillar reinforcement |
| JP6191428B2 (en) * | 2013-12-06 | 2017-09-06 | 新日鐵住金株式会社 | Press molding apparatus and press molding method |
| JP5863886B2 (en) | 2014-06-16 | 2016-02-17 | Ｊｆｅスチール株式会社 | Cold press forming method |
| WO2017002253A1 (en) * | 2015-07-02 | 2017-01-05 | 日産自動車株式会社 | Press molding method |
-
2017
- 2017-07-06 JP JP2017132445A patent/JP6690605B2/en active Active
-
2018
- 2018-04-25 KR KR1020197036919A patent/KR102300153B1/en active IP Right Grant
- 2018-04-25 MX MX2019015393A patent/MX2019015393A/en unknown
- 2018-04-25 CN CN201880041949.2A patent/CN110799278B/en active Active
- 2018-04-25 WO PCT/JP2018/016818 patent/WO2019008880A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| KR102300153B1 (en) | 2021-09-08 |
| JP6690605B2 (en) | 2020-04-28 |
| MX2019015393A (en) | 2020-02-20 |
| JP2019013952A (en) | 2019-01-31 |
| CN110799278A (en) | 2020-02-14 |
| WO2019008880A1 (en) | 2019-01-10 |
| KR20200007915A (en) | 2020-01-22 |
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