WO2017038960A1 - バンパリインフォースメントの製造法 - Google Patents
バンパリインフォースメントの製造法 Download PDFInfo
- Publication number
- WO2017038960A1 WO2017038960A1 PCT/JP2016/075746 JP2016075746W WO2017038960A1 WO 2017038960 A1 WO2017038960 A1 WO 2017038960A1 JP 2016075746 W JP2016075746 W JP 2016075746W WO 2017038960 A1 WO2017038960 A1 WO 2017038960A1
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- WO
- WIPO (PCT)
- Prior art keywords
- manufacturing
- bumper reinforcement
- range
- cross
- central
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D65/00—Designing, manufacturing, e.g. assembling, facilitating disassembly, or structurally modifying motor vehicles or trailers, not otherwise provided for
- B62D65/02—Joining sub-units or components to, or positioning sub-units or components with respect to, body shell or other sub-units or components
- B62D65/16—Joining sub-units or components to, or positioning sub-units or components with respect to, body shell or other sub-units or components the sub-units or components being exterior fittings, e.g. bumpers, lights, wipers, exhausts
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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
- B21D22/208—Deep-drawing by heating the blank or deep-drawing associated with heat treatment
-
- 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
-
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
- B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
- B60R19/04—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects formed from more than one section in a side-by-side arrangement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
- B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
- B60R19/18—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by the cross-section; Means within the bumper to absorb impact
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
- B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
- B60R19/24—Arrangements for mounting bumpers on vehicles
- B60R19/26—Arrangements for mounting bumpers on vehicles comprising yieldable mounting means
- B60R19/34—Arrangements for mounting bumpers on vehicles comprising yieldable mounting means destroyed upon impact, e.g. one-shot type
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
- B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
- B60R19/18—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by the cross-section; Means within the bumper to absorb impact
- B60R2019/1806—Structural beams therefor, e.g. shock-absorbing
- B60R2019/1813—Structural beams therefor, e.g. shock-absorbing made of metal
Definitions
- the present invention relates to a method for producing bumper reinforcement.
- the present invention relates to a bumper reinforcement manufacturing method in which tailored blank materials having different plate thicknesses between a central member and members on both sides thereof are formed into a predetermined M-shaped open cross-sectional shape by a hot press method.
- a bumper structure for receiving a collision load in the event of a vehicle collision is provided at the front or rear of the automobile body.
- the bumper structure is provided with bumper reinforcement as a core material.
- the bumper reinforcement is disposed in a long shape in the width direction of the automobile body, and is supported by being connected to a frame member of the automobile body by a bumper support structure at both end positions in the width direction of the automobile body.
- Bumper reinforcement may be manufactured from a tailored blank material in order to reduce the weight (see JP 2001-180398 A).
- the plate thickness of the members on both sides of the bumper reinforcement in the longitudinal direction is made thinner to reduce the weight.
- the bumper reinforcement is formed by rounding both ends of the bumper reinforcement in the direction of the vehicle body from the viewpoint of design arranged at the front or rear of the vehicle.
- bumper support structures for connecting to the frame members of the automobile body are arranged at both ends of the bumper reinforcement. And in the front part of a motor vehicle, the radiator which cools an engine is arrange
- a crash box that can absorb collision energy is usually arranged. For this reason, the cross-sectional width of the central portion of the bumper reinforcement is formed as narrow as possible while ensuring the necessary strength in order to improve the cooling action of the radiator.
- both ends have a wider cross-sectional width than the central part, which is necessary for the mounting, because of the arrangement of the crash box.
- the intermediate part which connects a center part and both ends is made into the cross-sectional width
- the cross-sectional width of the bumper reinforcement has a relatively narrow constant width at the center, both ends have a relatively wide constant width, and the middle part extends from the center to both ends.
- the shape gradually widens toward the end.
- the bumper reinforcement in the above form is formed by cold pressing or hot pressing.
- the strength of the springback amount is large and the accuracy is high because the strength of the center position member constituting the tailored blank material, the members on both sides thereof, and the welded portion between them are different. Is difficult.
- the periphery of the welded part that has been softened by the heat effect of welding is likely to break during molding.
- arc welding is performed, resulting in high cost.
- the crash box mounting portion becomes the anti-collision surface, so the stroke amount of the crash box is small and not efficient. Further, when curve forming is performed by cold forming, wrinkles are concentrated on the low strength portion. For this reason, wrinkles overlap, resulting in a defective product.
- the present inventor intends to solve the above-described problem in the B-shaped cross-sectional shape by forming the cross-sectional shape by the hot press method as the most efficient M-shaped open cross-sectional shape in terms of strength in the open cross-section. I tried to do it. However, the problem of wrinkling during molding could not be solved. Therefore, paying attention to the position of the differential thickness joint line of the tailored blank material, we conducted extensive research from the viewpoint that this position may be related to the generation of wrinkles. As a result, it has been found that the occurrence of wrinkles can be prevented or suppressed by setting the differential thickness joining line of the tailored blank material to the position of the intermediate portion widening range.
- a method according to an aspect of the present invention is a method of manufacturing an elongated bumper reinforcement disposed in the width direction of a vehicle body at a front portion or a rear portion of an automobile body.
- a flat tailored blank material is formed by joining a member and members on both sides of the member, and this tailored blank material is press-formed by a hot press method to form a bumpy reinforcement having a long shape and an M-shaped open cross section.
- the difference in strength between the member at the center position, the members at both sides of the member, and the welded portion of the tailored blank material is small, and the amount of spring back is almost equal, so a highly accurate product can be obtained.
- wrinkle concentration can be suppressed because the low-strength portion is eliminated.
- wrinkles are not concentrated on the low-strength portion, so that generation of wrinkles can be prevented or suppressed.
- large wrinkles are likely to occur at the starting point of the curve formation and the starting point of the widening formation, but the differential thickness joint line becomes a ridge line, and the wrinkles are divided to form a member at the center position. And the occurrence of wrinkles can be prevented or suppressed.
- a crash box between the wide end width range having a constant width and the vehicle body. As a result, the energy of the collision impact load acting on the bumper reinforcement is also absorbed by the crash box.
- the plate thickness of the member at the central position is larger than the plate thickness of the members at both side positions. Therefore, the strength of the member at the central position can be made higher than the strength of the members at the both side positions, and the collision load can be reliably received.
- the material of the member at the center position and the material of the members at the both side positions are preferably the same material.
- the material of the constituent member of the bumper reinforcement becomes one type, and the procurement thereof becomes easy.
- a flange is formed in the opening portion of the M-shaped open cross section, and a bracket as a strength reinforcing member is attached to the flange by welding.
- the strength of the bumper reinforcement can be improved by the bracket attached to the flange.
- the bracket can be welded by spot welding, and the cost can be reduced.
- the generation of wrinkles that occur during hot press molding can be prevented or suppressed.
- the wrinkle to be generated during hot press molding becomes the ridge line, and the wrinkle is divided. Prevent or suppress the generation of wrinkles.
- FIG. 4 is a sectional view taken along line IV-IV in FIGS. 2 and 3.
- FIG. 5 is a cross-sectional view taken along line VV in FIGS. 2 and 3.
- FIG. 1 shows an arrangement position of a bumper structure 10 in an automobile.
- the bumper structure 10 is usually disposed in the width direction with respect to the automobile body 12 at the front and rear portions of the automobile body 12.
- the front of the vehicle body 12 is indicated by an arrow F
- the rear is indicated by an arrow R.
- the bumper structure 10 includes a bumper reinforcement 14, a bumper covering member 16, and a bumper support structure 18.
- the bumper reinforcement 14 is disposed as a core material on the strength of the bumper structure 10.
- the bumper covering member 16 is disposed so as to cover the front surface of the bumper reinforcement 14.
- the bumper covering member 16 is disposed on the outermost surface of the bumper structure 10 and has a configuration in consideration of appearance. Usually, it is made of a resin suitable for molding a design.
- the bumper support structure 18 is arranged between the frame member (not shown) of the automobile body 12 and the bumper reinforcement 14 at both ends in the longitudinal direction of the bumper reinforcement 14 (width direction when viewed from the automobile body 12). ing.
- the bumper support structure 18 transmits the collision load received by the bumper reinforcement 14 to the automobile body 12 and supports it by the automobile body 12.
- the bumper support structure 18 is formed of a component capable of absorbing collision energy, referred to as a crash box in a preferred embodiment.
- the bumper reinforcement 14 disposed in the front part of the automobile body 12 will be described as an example.
- the bumper reinforcement may be disposed at the rear of the automobile body.
- a collision load that acts on the central position of the bumper structure 10 due to a frontal collision of an automobile can be received as follows.
- the bumper covering member 16 is received by the bumper covering member 16 and supported by the bumper reinforcement 14.
- the load which acted on the bumper reinforcement 14 is received by the vehicle body 12 through the crash box as the bumper support structure 18 disposed at both ends of the bumper reinforcement 14.
- the crash box 18 absorbs the collision energy.
- FIGS. 2 to 5 show the configuration of the bumper reinforcement 14 produced by the manufacturing method as one embodiment.
- 2 is a front perspective view
- FIG. 3 is a front view showing the right half when viewed from the front
- FIG. 4 is a sectional view taken along the line IV-IV in FIGS. 2 and 3
- FIG. 5 is FIGS.
- a cross-sectional view taken along line VV is shown.
- the bumper reinforcement 14 has a long shape.
- the bumper reinforcement 14 is formed by joining three members. That is, it is divided into three parts.
- a member 14A at the center position in the X1 range shown in FIG. 2 and a member 14B at both side positions shown in the X2 range are joined by laser welding.
- the plate member 14A at the center position and the plate member 14B at the both side positions are different in thickness, and the plate thickness of the member 14B at the both side positions is made thinner than the plate thickness of the member 14A at the center position.
- the plate thickness of the member 14A at the center position is 2.0 mm
- the plate thickness of the member 14B at both side positions is 1.6 mm, which is a plate thickness difference of 0.4 mm.
- the bumper reinforcement 14 of the preferred embodiment is manufactured using a so-called tailored blank material.
- the difference thickness joining line of the bumper reinforcement 14 originating in the tailored blank material is shown by the code
- the central member 14A and both side members 14B are made of the same material, usually made of steel. Other materials such as aluminum may be used. Further, a combination of different materials may be used as long as welding joining is possible.
- the cross-sectional shape of the bumper reinforcement 14 of the preferred embodiment is basically an M-shaped open cross-sectional shape. This is because the open cross-sectional shape is the most efficient in terms of strength.
- the cross-sectional width of the M-shaped open cross-sectional shape differs in the longitudinal direction.
- the central part shown by the Y1 range in FIG. 2 is formed with a relatively narrow constant width.
- This range Y1 is defined as a narrow central range.
- Both end portions shown in the Y3 range are formed with a relatively wide constant width.
- This range Y3 is a wide range of both end widths.
- the intermediate portion between the Y1 range and the Y3 range is formed as a shape that gradually widens from the cross-sectional width of the Y1 range to the cross-sectional width of the Y3 range.
- This range Y2 is defined as an intermediate portion widening range.
- FIG. 4 shows a narrow cross-sectional shape of the member 14A at the center position in the Y1 range.
- FIG. 5 shows a wide cross-sectional shape of the member 14B on both sides of the Y3 range.
- the cross-sectional shape in the Y2 range is a changed shape that gradually widens from the narrow cross-sectional shape in the Y1 range to the wide cross-sectional shape in the Y3 range.
- the cross-sectional shape of the member 14A at the center position in the Y1 range shown in FIG. 4 is narrower than the cross-sectional shape of the member 14B at both side positions in the Y3 range shown in FIG. Has been. This is because a radiator for cooling the engine is disposed behind the central member 14A, so that a large amount of airflow can be supplied to the radiator. Due to such a request, the cross-sectional width W1 is formed as narrow as possible in relation to ensuring the strength.
- the component of the M-shaped open cross-sectional shape shown in FIG. 4 consists of the front part 14a, the upper surface part 14b, and the lower surface part 14c as a large frame.
- the front surface portion 14a is a contact surface at the time of a so-called vehicle collision, and has a concave shape 14d in which a central portion is recessed backward from the viewpoint of securing strength.
- a flange 14e is formed to extend in the vertical direction at the open ends of the rear surface of the upper surface portion 14b and the lower surface portion 14c.
- the cross-sectional width W2 has a wider cross-sectional width W2 and a lower cross-sectional height H2 than the cross-sectional shape of the central member 14A shown in FIG. 4 described above. That is, the cross-sectional width W2 is formed wider than the cross-sectional width W1. The widening is gradually increased from the cross-sectional width W1, and the cross-sectional width W2 is constant. This is because the members 14B at both sides do not require the strength against collision in comparison with the member 14A at the central position described above, and the mounting area of the crash box 18 is ensured.
- the appearance of the bumper structure is improved by forming the both side positions curved toward the rear as compared with the central position.
- the cross-sectional width is widened and the curve is formed toward the Y2 range and the Y3 range starting from the boundary position between the Y1 range and the Y2 range.
- the difference thickness joining line S in a tailored blank material has the characteristics in being made into the position of the intermediate part widening range of Y2 range. Thereby, it can prevent thru
- the bumper support structure 18 is not necessarily a crash box. In the case where the cross-sectional widths at both ends are formed wider from other requirements, the present invention can be widely applied.
- the material preparation step the material of the central member 14A and the material of the members 14B on both sides of the bumper reinforcement 14 are prepared. Each material has a predetermined size in advance. That is, when forming by a hot press method in a subsequent process, the differential thickness joining line S is formed so as to be positioned in the intermediate portion widening range Y2.
- the flat plate material of the member 14A at the center position prepared in advance and the flat plate material of the member 14B at both side positions thereof are joined by laser welding. Thereby, it is set as the flat material of the predetermined shape for shape
- the welding may be plasma welding.
- the flat plate material having the predetermined shape is set to a predetermined temperature suitable for hot forming, and hot pressed by the upper die 22 and the lower die 24 to obtain the product shape shown in FIG. Mold.
- the press sectional view of this hot press process is illustrated as a cross-sectional width direction of the bumper reinforcement 14, and is different from the view illustrating the bumper reinforcement 14 of other processes in the longitudinal direction.
- FIG. 7 shows a wrinkle generated on the flange 14e when the bumper reinforcement 14 is formed by the hot press method described above. According to the hot press method of the above-described embodiment, since the low strength portion is eliminated, wrinkles are not concentrated on the low strength portion as in the prior art by cold press molding.
- the wrinkles to be generated in the curve forming portion and the intermediate portion widening range Y2 are divided into wrinkles as shown in FIG. 7, and the wrinkles are divided into the central portion X1 and the both end portions X2. Since it is dispersed, the generation of wrinkles can be prevented or suppressed.
- a bracket such as a reinforcing plate can be attached to the flange 14e.
- the welding joint at this time can be spot welding, and can be made low-cost.
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- Mechanical Engineering (AREA)
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- Thermal Sciences (AREA)
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- Body Structure For Vehicles (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
Description
Claims (7)
- 自動車車体の前部または後部に車体の幅方向に向けて配設される長尺形状のバンパリインフォースメントの製造法であって、
板厚の異なる中央位置の部材とその両側位置の部材を接合して平板形状のテーラードブランク材を形成し、
このテーラードブランク材をホットプレス工法により加圧成形して長尺形状でM字開断面のバンパリインフォースメントを形成し、中央部幅狭範囲と、この中央部幅狭範囲よりも幅広の両端部幅広範囲と、中央部幅狭範囲から両端部幅広範囲に向けて漸次拡幅する中間部拡幅範囲とを形成すると共に、長尺形状の両端部位を中央部位に対して断面の開口側に湾曲形成し、このホットプレス工法時において中央位置の部材と両側位置の部材の間の差厚接合線が前記中間部拡幅範囲内の位置となるように成形される、製造法。 - 請求項1の製造法であって、
バンパリインフォースメントの両端部幅広範囲と自動車車体との間にクラッシュボックスが取付けられる、製造法。 - 請求項1又は請求項2の製造法であって、
テーラードブランク材を構成する前記中央位置の部材の板厚はその両側位置の部材の板厚より厚い、製造法。 - 請求項1から請求項3のいずれかの製造法であって、
テーラードブランク材を構成する前記中央位置の部材の材質とその両側位置の部材の材質は同じ材質である、製造法。 - 請求項1から請求項4のいずれかの製造法であって、
テーラードブランク材を加圧成形する工程において前記M字開断面形状の開口部にフランジが形成され、このフランジに強度補強部材としてのブラケットが溶接により取付けられる、製造法。 - 請求項1から請求項5のいずれかの製造法であって、バンパリインフォースメントのM字開断面が自動車の前後方向の内方に向けて開口している、製造法。
- 請求項1から請求項6のいずれかの製造法であって、長尺形状のバンパリインフォースメントの両端部位が中央部位に対して車体方向に湾曲している、製造法。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201680050239.7A CN108349452B (zh) | 2015-09-03 | 2016-09-02 | 保险杠加强件的制造方法 |
US15/757,576 US10479429B2 (en) | 2015-09-03 | 2016-09-02 | Process for manufacturing bumper reinforcement |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2015-173839 | 2015-09-03 | ||
JP2015173839A JP6479612B2 (ja) | 2015-09-03 | 2015-09-03 | バンパリインフォースメントの製造法 |
Publications (1)
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WO2017038960A1 true WO2017038960A1 (ja) | 2017-03-09 |
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PCT/JP2016/075746 WO2017038960A1 (ja) | 2015-09-03 | 2016-09-02 | バンパリインフォースメントの製造法 |
Country Status (4)
Country | Link |
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US (1) | US10479429B2 (ja) |
JP (1) | JP6479612B2 (ja) |
CN (1) | CN108349452B (ja) |
WO (1) | WO2017038960A1 (ja) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2018012588A1 (ja) * | 2016-07-13 | 2018-01-18 | 新日鐵住金株式会社 | ホットスタンプ成形品、自動車部材、及びホットスタンプ成形品の製造方法 |
JP6704870B2 (ja) * | 2017-03-14 | 2020-06-03 | 豊田鉄工株式会社 | バンパリインフォースメント |
EP3611058A4 (en) * | 2017-04-10 | 2021-01-06 | Nippon Steel Corporation | STRUCTURAL ELEMENT FOR AUTOMOBILES |
US10399519B2 (en) * | 2017-06-16 | 2019-09-03 | Ford Global Technologies, Llc | Vehicle bumper beam with varied strength zones |
JP6875941B2 (ja) * | 2017-06-20 | 2021-05-26 | 株式会社アイシン | 衝撃吸収装置 |
JP7358307B2 (ja) | 2020-08-11 | 2023-10-10 | 豊田鉄工株式会社 | 車両用構造部材 |
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2015
- 2015-09-03 JP JP2015173839A patent/JP6479612B2/ja not_active Expired - Fee Related
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2016
- 2016-09-02 US US15/757,576 patent/US10479429B2/en not_active Expired - Fee Related
- 2016-09-02 WO PCT/JP2016/075746 patent/WO2017038960A1/ja active Application Filing
- 2016-09-02 CN CN201680050239.7A patent/CN108349452B/zh active Active
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JP2010509122A (ja) * | 2006-11-09 | 2010-03-25 | イェスタムプ・ハードテック・アクチエボラーグ | バンパービーム |
JP2010023658A (ja) * | 2008-07-18 | 2010-02-04 | Sumitomo Metal Ind Ltd | バンパーリインフォースメントおよびその製造方法 |
JP2014058221A (ja) * | 2012-09-18 | 2014-04-03 | Fuji Heavy Ind Ltd | 車両用バンパビーム |
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JP6479612B2 (ja) | 2019-03-06 |
JP2017047818A (ja) | 2017-03-09 |
CN108349452A (zh) | 2018-07-31 |
US10479429B2 (en) | 2019-11-19 |
US20180251174A1 (en) | 2018-09-06 |
CN108349452B (zh) | 2021-05-04 |
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