WO2017010470A1 - Press forming method and method of manufacturing press-formed component - Google Patents
Press forming method and method of manufacturing press-formed component Download PDFInfo
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- WO2017010470A1 WO2017010470A1 PCT/JP2016/070495 JP2016070495W WO2017010470A1 WO 2017010470 A1 WO2017010470 A1 WO 2017010470A1 JP 2016070495 W JP2016070495 W JP 2016070495W WO 2017010470 A1 WO2017010470 A1 WO 2017010470A1
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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
- B21D22/02—Stamping using rigid devices or tools
-
- 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
Definitions
- the present invention When applying a high strength material to a complex shape part such as an automobile frame part, the present invention sets the part shape of the previous process before reaching the final part shape when pressing the part in a plurality of steps.
- the present invention relates to a press molding method in which press molding is performed using the part shape of the previous process, and a press molded component manufacturing method using the same.
- One hot cracking technique is hot pressing (see Patent Document 1).
- a steel sheet is heated and pressed in a softened state to improve formability at the time of forming, and then strengthened by quenching by mold cooling.
- the hot press requires special equipment, and the production speed is slow, and there are problems in terms of cost and productivity.
- the improvement of formability due to multiple processes is largely due to the experience of engineers in setting the part shape of the previous process before reaching the final part shape, and the shape setting method of the previous process has not been established, and the shape setting It is hard to say that efficiency is being improved.
- the present invention establishes a shape setting method for the previous process and efficiently sets the part shape for the previous process and simplifies the pressing process of the final process to solve the above problems.
- An object is to provide a method of pressing without cracking.
- the press molding method of the present invention that advantageously solves the above problems sets the shape of the press molded product of the previous process from the development intermediate shape obtained in the middle of developing the final part shape of the press molded part having a drawn shape,
- the pre-processed press-molded product is press-molded into the set pre-processed press-molded product shape.
- the press molding of the previous step from the development middle shape obtained while opening the flange part of the final part shape of the press molded part having a hat-shaped cross-sectional shape as the drawing shape in the outward direction of the part. It is preferable to set the product shape. Further, in the press molding method of the present invention, the press molded product of the previous process is press molded into the shape of the press molded product of the previous process set by the above method, Next, a part of the press-formed product of the previous process is press-formed into the final part shape, Thereafter, the remaining part is preferably press-molded into the final part shape.
- the manufacturing method of the press-molded part of the present invention is a press-molding method of the present invention described above, and press-molds the press-molded product of the previous process into the press-molded product shape of the set previous process,
- the pre-processed press-molded product is press-molded into the final part shape.
- the shape is set so that the cross-sectional line length does not substantially change when forming from the previous process shape to the final part shape. That is, by setting the pre-process shape from the development intermediate shape obtained during the development of the final part shape, the press-formed product shape of the pre-process having substantially the same cross-section line length as the final part shape is set.
- the set shape of the press-molded product in the previous process is based on the shape obtained in the process of developing the final part shape, so by pressing a part and closing the cross-sectional shape to the final shape, Since the entire shape of the press-formed product is formed toward the final part shape, it is possible to simplify the press work in the final process.
- the present invention is a technique for improving the formability by forming a plurality of processes when pressing a complicated part shape. From the shape obtained in the process of developing the final part shape, Accordingly, it is possible to efficiently set the shape of the press-formed product in the previous process in which cracking is unlikely to occur.
- the present invention uses a simple press process in which a part of the shape of the press-formed product in the previous process is closed because there is no substantial change in the cross-sectional line length between the shape of the press-formed product in the previous process and the shape of the final part.
- press molding that brings the shape of the press-formed product in the previous process closer to the final part shape without fear of cracking.
- (A), (b), and (c) are a blank shape before press molding in an embodiment of the press molding method of the present invention and an embodiment of a method of manufacturing a press molded part of the present invention using the same. It is the perspective view seen from the back side slanting side of the part which shows a process press molded product shape and a final part shape, respectively with a rough line.
- (A) And (b) is the side view which shows the final part shape press-molded with the press molding method of the said embodiment, and the perspective view seen from the front side diagonal side of the component.
- (A) And (b) is a side view which shows the final part shape, and sectional drawing which shows the cross-sectional shape of the linear part
- (c) And (d) is the expansion
- It is sectional drawing which shows the cross-sectional shape of the side view which shows the press-formed product shape of the pre-process set from the halfway shape, and the linear part.
- FIG. 1 (a), FIG. 1 (b) and FIG. 1 (c) show one embodiment of the press molding method of the present invention and one embodiment of the manufacturing method of the press molded part of the present invention using the same. It is the perspective view seen from the back side slanting side of the part which shows the blank shape before press molding in, the pre-process press-formed product shape, and the last part shape in a rough line, respectively.
- a hat-shaped cross section as a complex-shaped part that has been conventionally prone to cracking in a high-tensile steel plate as a high-strength material for example, a hat-shaped cross section as a complex-shaped part that has been conventionally prone to cracking in a high-tensile steel plate as a high-strength material.
- the purpose is to improve the yield by reducing the frequency of cracking when drawing automotive frame parts with a shape.
- FIGS. 1 (a) to 1 (c) The press-formed product 2 of the previous process is drawn from the rectangular flat blank 1 and the final part 3 is press-formed from the press-formed product 2 of the previous process.
- FIG. 3 is a side view showing a part 3 and a perspective view of the component as viewed from an oblique front side.
- the final part shape 3 includes a linear portion 3a, a curved portion 3b that is connected to the linear portion 3a and curved toward the opening side, and a rising portion 3c that is connected to the curved portion 3b and rises with respect to the linear portion 3a.
- a flange portion 3d located on both sides of the opening, and has a hat-shaped cross-sectional shape over the entire length, and an angle formed between the linear portion 3a and the rising portion 3c is, for example, approximately It is 140 °.
- FIG. 3 (a) and 3 (b) are a side view showing the final part shape 3 and a cross-sectional view showing the cross-sectional shape of the linear part thereof
- FIG. 3 (c) and FIG. FIG. 3 is a side view showing a pre-processed press-formed part shape set from a development intermediate shape in the middle of developing a part shape 3, and a cross-sectional view showing a cross-sectional shape of a linear portion thereof.
- the flange part 3d of the final part shape 3 is obtained while being developed in the part outer direction (left and right direction in FIG. 3B).
- a pre-processed press-formed product shape 2 shown in FIGS. 3C and 3D is set.
- the shape of the press-formed product in the previous process is also connected to the linear portion 2a and the linear portion 2a and curved to the opening side. It has a bent hat 2b, a raised portion 2c that is connected to the bent portion 2b and rises with respect to the linear portion 2a, and flange portions 2d that are positioned on both sides of the opening.
- the angle formed by the straight portion 2a and the rising portion 2c is, for example, approximately 130 °.
- the angle formed between the bottom and the side wall is, for example, approximately 90 °
- the angle formed between the bottom and the side wall is, for example, approximately 130 °. .
- FIG. 4 is an exploded perspective view showing the structure of a drawing mold that draws the shape of a press-formed product in the previous process set from the shape during development from a rectangular blank in plan view.
- a rectangular blank 1 in a plan view is held between a die 4 and a blank holder 5 while being bent, and is pressed against a punch 6 by a die 4 as indicated by an arrow P1, and extends substantially over the entire length.
- a shallow groove shape with a hat-shaped cross section is formed, and the center portion is drawn into a press-formed product shape 2 of the previous process in which the center portion is curved in the opening direction of the groove.
- FIG. 5 is a back view of a part showing a part having a large thickness reduction rate and a part having a small thickness reduction rate of the final part shape 3 when formed from a blank in one step, obtained by FEM (Finite Element Method) analysis for press forming.
- FIG. 5 is a perspective view seen from the side oblique side, for example, when the final part shape 3 is drawn with a drawing die from a 2.0 mm thick plate made of a high-tensile steel plate of 590 MPa class, and the wrinkles of the blank holder 5
- the pressing force was set to 75 tons and the friction coefficient was set to 0.15
- the thickness reduction rate of the region TR1 on the bottom back surface of the curved portion 3b The maximum was approximately 20%, and cracks occurred in this region TR1.
- the thickness of the boundary region TR2 between the side wall portions and the flange portion of the curved portion 3b is increased, and the increase rate is approximately 17%, and wrinkles are generated in this region TR2.
- the rate of reduction in thickness in the region TR1 on the bottom rear surface of the curved portion 2b was maximized. Although it was about 17%, it was a grade which does not lead to a crack.
- the blank mesh size was 2 mm.
- the element used was a shell element.
- the FEM analysis was performed by the static implicit method using LS-DYNA ver971, which is also a commercially available CAE program.
- FIG. 6 is an exploded perspective view showing the structure of a press molding die in a preliminary process in which the linear part 2a of the press molded product 2 in the previous process is formed into a final shape without using a blank holder.
- This pre-process press mold includes a die portion as indicated by an arrow P2 in a state where the linear portion 2a of the press-molded product 2 of the pre-process is placed on the punch 8 with the opening facing downward and positioned by a positioning member (not shown). 7 is lowered and the linear part 2a is sandwiched between the punches 8 to form a foam, and the cross-sectional shape of the linear part 2a is closed to form the linear part 3a of the final part shape 3.
- the press-molding die for the preliminary process is not limited to the foam-molding die, and a draw-molding die that holds the wrinkles with a blank holder may be used.
- the press molding of this preliminary process since the material of both side walls of the curved portion 2b of the press-molded product 2 of the previous process moves inward in the radial direction of the curved portion, the circumferential length is left, As shown by the arrow L in FIG. 6, the bending angle of the curved portion 2 b decreases, and the entire press-formed product shape 2 in the previous process is formed toward the final part shape 3, and is close to the final part shape 3. Since the shape of the press-formed product in the preliminary process described later (indicated by the same reference numeral as that of the press-molded product in the preliminary process for ease of understanding) is 3 ', the press process in the final process can be simplified.
- FIG. 7A shows a pre-processed press molded product shape 2 (indicated by a solid line), a preliminary process press molded product shape 3 ′ (indicated by a one-dot chain line), and a final part shape 3 (indicated by a two-dot chain line).
- 7 (b), FIG. 7 (c) and FIG. 7 (d) are the AA, BB and CC lines in FIG. 7 (a). It is sectional drawing which each follows a line.
- the pre-processed press-molded product shape 2 becomes a pre-processed press-molded product shape 3 ′ in the preliminary-process foam molding.
- the linear part where the CC line is located coincides with the final part shape 3
- the curved part where the BB line is located is almost the final part shape.
- a high-strength steel sheet as a high-strength material for example, for a car having a hat-shaped cross-section as a complex-shaped part that has been easily cracked in the past.
- the pre-press shape 2 is set from the shape obtained in the process of developing the final part shape 3.
- the product shape 2 can be set efficiently, and the yield in actual press molding can be improved.
- the shape of the press molded product of the previous process is set from the development intermediate shape obtained during the development of the final part shape of the press molded part having the drawn shape. Since the pre-processed press-molded product is press-molded into the set pre-processed press-molded product shape, it is possible to efficiently set the pre-processed press-molded product shape that is less prone to cracking and has high strength. Even when a metal plate material is used, the yield at the time of press forming can be improved.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
Description
前記設定した前工程のプレス成形品形状に、前工程のプレス成形品をプレス成形することを特徴とするものである。 The press molding method of the present invention that advantageously solves the above problems sets the shape of the press molded product of the previous process from the development intermediate shape obtained in the middle of developing the final part shape of the press molded part having a drawn shape,
The pre-processed press-molded product is press-molded into the set pre-processed press-molded product shape.
また、本発明のプレス成形方法においては、前記方法で設定した前工程のプレス成形品形状に、前工程のプレス成形品をプレス成形し、
次いで、その前工程のプレス成形品の一部分を前記最終部品形状にプレス成形し、
その後、残りの部分を前記最終部品形状にプレス成形することとすると好ましい。 In the press molding method of the present invention, the press molding of the previous step from the development middle shape obtained while opening the flange part of the final part shape of the press molded part having a hat-shaped cross-sectional shape as the drawing shape in the outward direction of the part. It is preferable to set the product shape.
Further, in the press molding method of the present invention, the press molded product of the previous process is press molded into the shape of the press molded product of the previous process set by the above method,
Next, a part of the press-formed product of the previous process is press-formed into the final part shape,
Thereafter, the remaining part is preferably press-molded into the final part shape.
前記前工程のプレス成形品を、前記最終部品形状にプレス成形することを特徴とするものである。 And the manufacturing method of the press-molded part of the present invention is a press-molding method of the present invention described above, and press-molds the press-molded product of the previous process into the press-molded product shape of the set previous process,
The pre-processed press-molded product is press-molded into the final part shape.
2 前工程のプレス成形品(前工程のプレス成形品形状)
2a 直線状部
2b 湾曲部
2c 起き上がり部
2d フランジ部
3 最終部品(最終部品形状)
3a 直線状部
3b 湾曲部
3c 起き上がり部
3d フランジ部
3’ 予備工程のプレス成形品(予備工程のプレス成形品形状)
4 ダイ
5 ブランクホルダ
6 パンチ
7 ダイ
8 パンチ 1
4
Claims (4)
- 絞り形状を持つプレス成形部品の最終部品形状を展開する途中で得られる展開途中形状から前工程のプレス成形品形状を設定し、
前記設定した前工程のプレス成形品形状に、前工程のプレス成形品をプレス成形することを特徴とするプレス成形方法。 Set the shape of the press-molded product of the previous process from the shape in the middle of development obtained during the development of the final part shape of the press-formed part having the drawing shape,
A press molding method comprising press molding a pre-processed press-molded product into the set pre-processed press-molded product shape. - 前記絞り形状としてハット形断面形状を持つプレス成形部品の最終部品形状のフランジ部分を部品外側方向に開く途中で得られる展開途中形状から前工程のプレス成形品形状を設定することを特徴とする、請求項1記載のプレス成形方法。 The press-formed product shape of the previous process is set from the development intermediate shape obtained while opening the flange portion of the final part shape of the press-formed part having a hat-shaped cross-sectional shape as the drawing shape, The press molding method according to claim 1.
- 前記プレス成形方法で設定した前工程のプレス成形品形状に、前工程のプレス成形品をプレス成形し、
次いで、その前工程のプレス成形品の一部分を前記最終部品形状にプレス成形し、
その後、残りの部分を前記最終部品形状にプレス成形することを特徴とする、請求項1または2記載のプレス成形方法。 In the shape of the press molded product of the previous process set by the press molding method, the press molded product of the previous process is press molded,
Next, a part of the press-formed product of the previous process is press-formed into the final part shape,
3. The press molding method according to claim 1, wherein the remaining part is press-molded into the final part shape. - 請求項1から3までの何れか1項記載のプレス成形方法で、前記設定した前工程のプレス成形品形状に、前工程のプレス成形品をプレス成形し、
前記前工程のプレス成形品を、前記最終部品形状にプレス成形することを特徴とする、プレス成形部品の製造方法。
In the press molding method according to any one of claims 1 to 3, the press molded product of the previous process is press molded into the set shape of the press molded product of the previous process,
A method for producing a press-formed part, wherein the press-formed product of the previous step is press-formed into the final part shape.
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JP2017528682A JP6361902B2 (en) | 2015-07-13 | 2016-07-12 | Press molding method and manufacturing method of press molded parts |
KR1020187001078A KR102096385B1 (en) | 2015-07-13 | 2016-07-12 | Press forming method and method of manufacturing press-formed component |
CN201680041192.8A CN107835722B (en) | 2015-07-13 | 2016-07-12 | Press forming method and method for manufacturing press formed part |
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WO2020217594A1 (en) * | 2019-04-22 | 2020-10-29 | Jfeスチール株式会社 | Press-forming method |
WO2020217593A1 (en) * | 2019-04-22 | 2020-10-29 | Jfeスチール株式会社 | Press molding method |
JP2020185591A (en) * | 2019-05-15 | 2020-11-19 | Jfeスチール株式会社 | Press molding method |
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CN107835722B (en) | 2020-02-11 |
KR102096385B1 (en) | 2020-04-02 |
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