WO2012070623A1 - L形製品の製造方法 - Google Patents
L形製品の製造方法 Download PDFInfo
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- WO2012070623A1 WO2012070623A1 PCT/JP2011/077073 JP2011077073W WO2012070623A1 WO 2012070623 A1 WO2012070623 A1 WO 2012070623A1 JP 2011077073 W JP2011077073 W JP 2011077073W WO 2012070623 A1 WO2012070623 A1 WO 2012070623A1
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- shaped product
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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
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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
- B21D53/00—Making other particular articles
- B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
Definitions
- the present invention relates to a method for manufacturing an L-shaped product, and more particularly to a method for manufacturing an L-shaped member having a hat-shaped cross section used for a lower front pillar of a monocoque body automobile from a metal thin plate blank.
- the blank In the drawing process, generally, the blank needs to have high stretchability, and the drawing blank is formed from a relatively low strength material. Accordingly, a relatively thick blank is required to improve the collision performance of the automobile, and there is a problem that the weight and material cost of the skeleton structure of the automobile are increased.
- the present invention has a technical problem to solve the problems in the prior art range, and from a blank having a small margin as compared with a conventional drawing process, the L-shape is formed by pressing without generating cracks and wrinkles. It aims to provide a method for manufacturing a product. Another object of the present invention is to provide a method for producing an L-shaped product satisfactorily even when a high-tensile material having a lower drawability is used as well as a relatively low-strength steel plate having a higher drawability as a blank. Yes.
- An L-shaped flat top wall having first and second legs corresponding to the first and second legs, and completed.
- Manufacturing an intermediate product including an inner wall and an outer wall corresponding to an inner wall and an outer wall of the L-shaped product, and a flange portion corresponding to a flange portion of the completed L-shaped product,
- the product includes a first region adjacent to a tip of the first leg and a second region adjacent to the second leg, wherein the intermediate product is completed in the first region.
- a shape substantially matching a corresponding shape of the L-shaped product, and in the second region, each angle between the upper wall and the inner and outer walls is to the second leg.
- the method further includes the steps of providing a bending die assembly and further pressing the intermediate product with the bending die assembly to produce the finished L-shaped product.
- a method of manufacturing an L-shaped product comprising the steps is provided.
- FIG. 2 is a cross-sectional view of an L-shaped product along the arrow line aa in FIG. 1. It is a perspective view of an L-shaped aperture panel. It is sectional drawing of a drawing process. It is sectional drawing at the time of a bending process start. It is sectional drawing of a bending process. It is a top view of an intermediate product.
- FIG. 7 is a cross-sectional view of the intermediate product along the arrow line AA in FIG. 6.
- FIG. 7 is a cross-sectional view of the intermediate product along the arrow BB in FIG. 6.
- FIG. 7 is a cross-sectional view of the intermediate product along the line of sight CC in FIG. 6.
- FIG. 7 is a cross-sectional view of the intermediate product along the arrow line DD in FIG. 6. It is explanatory drawing of the movement state of the material of the blank in a bending process. It is explanatory drawing of the movement state of the material of the blank in a bending process. It is a top view which shows a part of L-shaped product after a bending process.
- FIG. 9B is a partial side view of the L-shaped product viewed in the direction of the arrow EE in FIG. 9A. It is sectional drawing of the L-shaped product in alignment with arrow FF in FIG. 9A. It is a perspective view of the L-shaped shape after a bending process. It is a perspective view of the L-shaped shape after a bending process.
- a metal thin plate blank having a relatively large margin is prepared, and the blank is drawn to obtain a drawn panel 100 as shown in FIG. It is manufactured and the excess part is removed from the diaphragm panel 100.
- a portion I between the first and second leg portions 102a and 102b in the upper wall 102 of the diaphragm panel 100 is excessively formed during press working, and wrinkles are likely to occur.
- the material is insufficient and the inner flange portion 108 is easily broken.
- a drawing die assembly 30 in order to manufacture the L-shaped product 10, first, a drawing die assembly 30 is prepared.
- the drawing die assembly 30 includes a drawing die 32, and a holder 34 and a punch 36 disposed facing the drawing die 32.
- the drawing die 32 includes a recess 32a having a shape corresponding to the shape of the upper wall 52, the inner wall 54 and the outer wall 56 of the intermediate product 50, and a flat surface extending along the peripheral edge of the recess 32a.
- flanks 32b flanks 32b.
- the holder 34 has a flat clamp surface 34 a that faces the flank 32 b of the drawing die 32.
- the clamp surface 34a of the holder 34 is substantially U-shaped and has one end open, and the intermediate product 50 has a second leg 52b opposite to the first leg 52a.
- the portion of the blank 26 corresponding to the edge 52e adjacent to is not clamped.
- the punch 36 has an outer shape 36 a having a shape corresponding to the concave portion 32 a of the drawing die 32.
- the intermediate product 50 includes a first region adjacent to the distal end of the first leg 52a and a second region adjacent to the second leg 52b.
- FIGS. 6A and 6B which are cross-sectional views of the intermediate product 50 taken along arrows AA and BB in FIG. 6, each of the upper wall 52, the inner wall 54, and the outer wall 56.
- the intermediate product 50 has a shape substantially corresponding to the corresponding shape of the finished L-shaped product 10, being substantially equal to the angle ⁇ 1 of 1 and the second angle ⁇ 2 of 90 to 115 °.
- FIG. 6C which is a cross-sectional view of the intermediate product 50 along the arrow CC in FIG. 6, the first angle ⁇ formed by each of the upper wall 52, the inner wall 54, and the outer wall 56. 1C and the second angle ⁇ 2C are larger than the first angle ⁇ 1 and the second angle ⁇ 2 of the L-shaped product 10 that is the finished product, and further toward the second leg 52b. Increasingly. More specifically, the first angle ⁇ 1C and the second angle ⁇ 2C of the intermediate product 50 in the CC cross section are 120 to 180 °. Further, in the cross section taken along the line DD of FIG. 6, the first angle of the intermediate product 50 disappears, and this portion, that is, the edge 52 e adjacent to the second leg 52 b of the intermediate product 50. In the vicinity, the inner wall 54 is substantially in the same plane as the upper wall 52.
- the first region adjacent to the tip of the first leg portion 12a of the L-shaped product 10 has a relatively gentle change in shape, and is formed into a shape substantially the same as the final shape by drawing. can do.
- wrinkles and cracks are likely to occur in the second region adjacent to the second leg portion 12b of the L-shaped product 10 including the inner curved portion 22 and the outer curved portion 24 that change relatively greatly.
- the intermediate product 50 is manufactured from the blank 26 by the drawing process in the first step, and the bending process is performed on the second region of the intermediate product 50 in the second step. To match the shape of a typical L-shaped product 10.
- the curve and protrusion of the L-shaped lower end edge before molding may have a certain curvature or a combination of a plurality of curvatures or an ellipse depending on the L-shape to be molded and securing the joining allowance with other parts.
- it may be a straight line, a combination of a straight line and a curved line, or a wave shape, and the protrusion amount may be adjusted according to the part shape and the degree of processing. In order to adjust the degree of bending and protrusion, it is preferable to use a molding simulation by a computer.
- the blank can be made smaller than the conventional one. Further, since the reduction of the plate thickness due to forming is suppressed, not only a relatively low-strength steel plate having a high stretchability but also a high-tensile material having a lower stretchability can be pressed well.
- a bulging portion 16a that bulges upward in an arc shape from the upper wall 12 is formed on the outer edge portion 12d between the upper wall 12 and the outer wall 16 in the outer curved portion 24.
- the arc-shaped profile of the outer curved portion 24 when the upper wall 12 shown on the left side of FIG. 9A is viewed from the top, and the arc-shaped profile of the upper end portion 9 when viewed from the side shown on the right side of FIG. The difference between and should be within 10mm.
- a predetermined range F ip from the center portion C 22 of the inner curved portion 22 of the L-shaped product 10 after bending to the first leg portion 12a in this embodiment, a range of 100 mm.
- the width h of the inner flange portion 18 of the L-shaped product 10 is preferably set to 25 to 100 mm for the following reason.
- the force pulling the second leg 52b toward the first leg 52a acts on the portion of the predetermined range Fip of the inner flange portion 18 of the L-shaped product 10.
- the width h is 25 mm or less, the stress indicated by V in FIG. 11 becomes excessive, and the material in the end portion III (FIGS. 7 and 8) adjacent to the second leg 52b of the upper wall 52 of the intermediate product 50 This causes a problem that the outflow of the steel becomes excessive, the plate thickness is greatly reduced, and cracking is likely to occur.
- the width h is 100 mm or more, in the bending process, the compression in the portion IV (FIG. 11) adjacent to the inner curved portion 62 in the inner flange portion 58 of the intermediate product 50 becomes excessive.
- the inner wall 14 has a radius of curvature of at least 5 mm.
- the radius of curvature of the inner side wall 14 when the radius of curvature of the inner side wall 14 is 5 mm or less, the curvature is too large, so that the vicinity of the joint between the inner side wall 14 and the inner flange portion 18 is subjected to local overhang forming at the portion having the maximum curvature. It becomes easy to generate a crack.
- the radius of curvature of the inner curved portion 22 of the inner wall 14 exceeds 300 mm, the second leg portion 12b of the L-shaped product 10 becomes longer, and the second leg portion 12b of the L-shaped product 10 becomes longer in the bending process.
- the curvature radius of the inner curved portion 22 of the inner wall 14 is preferably 5-300 mm.
- the metal thin plate forming the blank 26 can be a high-tensile steel plate having a low elongation property and a breaking strength of 400 MPa or more and 1600 MPa or less.
- the blank 26 made of a thin metal plate with a small margin is formed on the L-shaped product 10 having the inner curved portion 22 and the outer curved portion 24 as compared with the case of normal drawing.
- an L-shaped product 200 forms a front pillar lower portion extending from a windshield lower edge to a side sill (not shown) in a monocoque body automobile frame structure.
- the L-shaped product 200 includes a part of the front pillar upper portion 206 extending along the windshield side edge 208, a first leg 202 connected to the front pillar upper portion 206, and a second portion connected to the side sill.
- the outer curved portion 200a extends substantially along an arc and forms a part of a wheel house (not shown) of the front wheel.
- the blank 210 shown in FIG. 13 is made of a high-strength steel plate having a tensile strength of 980 MPa, a breaking elongation limit of 17.2%, and a plate thickness of 1.8 mm, and has an expanded shape of the L-shaped product formation 200 of FIG. It has a shape with a 5mm margin. Further, the blank 210 has a protruding portion 212 curved outward.
- the drawing die assembly 220 includes a punch 222, a blank holder 224, and a drawing die 226. By drawing the blank 210 with the drawing die assembly 220, the intermediate product 230 shown in FIG. 15 is formed.
- the blank 210 is an aluminum plate having a tensile strength of 296 MPa, a breaking elongation limit of 24.0%, and a plate thickness of 1.8 mm, and pressed by the drawing die assembly 220 and the bending die assembly 240 Similarly, the L-shaped product 200 could be formed satisfactorily.
- FIG. 17A to FIG. 24A there are shown experimental examples in which generation of wrinkles and cracks was observed by press working with the L-shaped product manufacturing method of the present invention while changing various parameters.
- an L-shaped product 300 having a hat cross section to be pressed in this experimental example has first and second legs 302a and 302b connected to each other, as in the above-described embodiment.
- An upper wall 302 formed in an L shape is provided.
- the L-shaped product 300 further extends along the inner edge 302 c of the upper wall 302 and forms an inner wall 304 that forms a predetermined first angle ⁇ 1 with respect to the upper wall 302.
- extending along the outer edge 302d includes an outer wall 306 which forms a predetermined second angle alpha 2 relative to the upper wall 302, each of the inner side wall 304 and the outer wall 306, upper It terminates at an inner flange portion 308 and an outer side 310 that extend substantially parallel to the wall 302.
- the L-shaped product 300 has an inner curved portion 312 and an outer curved portion 314 between the first and second legs 302a and 302b.
- the outer curved portion 314 extends generally along an arc.
- a bulging portion 306a that bulges upward from the upper wall 302 in an arc shape is provided on the outer edge 302d between the upper wall 302 and the outer wall 306.
- the intermediate product 350 is a substantially L-shaped flat upper wall having first and second legs 352a, 352b corresponding to the first and second legs 302a, 302b of the upper wall 302 of the L-shaped product 300. 352.
- the intermediate product 350 further extends along the inner edge 352 c and the outer edge 352 d of the upper wall 352, and the inner wall 354 and the outer wall 356 respectively corresponding to the inner wall 304 and the outer wall 306 of the L-shaped product 300.
- an inner flange portion 358 and an outer flange portion 360 corresponding to the inner flange portion 308 and the outer flange portion 310 of the L-shaped product 300.
- a bending die comprising an anvil 332, a pad 334 having an abutment surface 334 a that clamps the upper wall 352 of the intermediate product 350 together with the anvil 332, and a bending die 336 that presses the intermediate product 350 against the anvil 332.
- An assembly 330 was prepared, and the intermediate product 350 was pressed by the bending die assembly 330 to obtain an L-shaped product 300.
- Table 1 shows the results of carrying out the present invention by changing various parameters.
- L is the length of the portion where the angles ⁇ 1 and ⁇ 2 change in the second region.
- H Height of the inner wall 352 and the outer wall 354.
- a The height of the bulging portion 306a viewed in the direction parallel to the upper wall 302 of the L-shaped product 300.
- b The width of the bulging portion 306a viewed in the direction perpendicular to the upper wall 302 of the L-shaped product 300.
Abstract
Description
図1、1Aを参照すると、本発明でプレス加工しようとするハット断面を持つL形製品10は、互いに連結された第1と第2の脚部12a、12bを有して概ねL形に形成された上壁12を具備している。L形製品10は、更に、上壁12の内側縁部12cに沿って延設され、該上壁12に対して所定の第1の角度α1を形成する内側壁14と、上壁12の外側縁部12dに沿って延設され、該上壁12に対して所定の第2の角度α2を形成する外側壁16とを具備し、該内側壁14および外側壁16の各々は、上壁12に略平行に延びる内側フランジ部18および外側20にて終端されている。第1と第2のの角度α1、α2は、より具体的には90~115°の角度となっている。
図12において、L形製品200はモノコックボディーの自動車の骨格構造において、ウインドシールド下縁からサイドシル(図示せず)へ延びるフロントピラー下方部分を形成している。L形製品200は、ウインドシールド側縁208に沿って延びるフロントピラー上方部分206の一部と、該フロントピラー上方部分206に連結される第1の脚部202と、サイドシルに連結される第2の脚部204とを含む。また、外側湾曲部分200aは概ね円弧に沿って延びており、前輪のホイールハウス(図示せず)の一部を形成している。
L:第2の領域において角度β1、β2が変化する部分の長さである。
H:内側壁352および外側壁354の高さである。
θ:矢視線C-Cにおける中間製品350の上壁352と内側壁354がなす外角でありθ=180-β1Cである。
a:L形製品300の上壁302に平行な方向に見た膨出部306aの高さである。
b:L形製品300の上壁302に垂直な方向に見た膨出部306aの幅である。
12 上壁
12a 第1の脚部
12b 第2の脚部
12c 内側縁部
12d 外側縁部
14 内側壁
16 外側壁
16a 膨出部
18 内側フランジ部
20 外側フランジ部
22 内側湾曲部分
24 外側湾曲部分
26 ブランク
30 絞り加工ダイ組立体
32 絞り加工ダイ
32a 凹部
32b フランク
34 ホルダー
34a クランプ面
36 パンチ
36a 外形
40 曲げ加工ダイ組立体
42 アンビル
42a 外形
42b 上面
44 パッド
44a 当接面
46 曲げ加工ダイ
50 中間製品
52 上壁
52a 第1の脚部
52b 第2の脚部
52c 内側縁部
52d 外側縁部
54 内側壁
56 外側壁
58 内側フランジ部
60 外側フランジ部
62 内側湾曲部分
100 絞りパネル
102 上壁
102a 第1の脚部
102b 第2の脚部
108 内側フランジ部
200 L形製品
200a 外側湾曲部分
202 第1の脚部
202a 上壁
204 第2の脚部
206 フロントピラー上方部分
208 ウインドシールド側縁
210 ブランク
220 絞り加工ダイ組立体
222 パンチ
224 ブランクホルダー
226 絞り加工ダイ
230 中間製品
240 曲げ加工ダイ組立体
242 曲げ加工ダイ
246 パッド
248 パンチ
300 L形製品
302 上壁
302a 第1の脚部
302b 第2の脚部
302c 内側縁部
302d 外側縁部
304 内側壁
306 外側壁
306a 膨出部
308 内側フランジ部
310 外側フランジ部
312 内側湾曲部分
314 外側湾曲部分
318 ブランク
320 絞り加工ダイ組立体
322 絞り加工ダイ
324 ホルダー
326 パンチ
330 曲げ加工ダイ組立体
332 アンビル
334 パッド
336 曲げ加工ダイ
350 中間製品
352 上壁
352 内側壁
352a 第1の脚部
352b 第2の脚部
352c 内側縁部
352d 外側縁部
354 内側壁
356 外側壁
358 内側フランジ部
360 外側フランジ部
Claims (11)
- 内縁部と外縁部とを画成するように互いに連結された第1と第2の脚部を有したL形の平坦な上壁と、前記上壁の前記内縁部沿いに延設、連結され前記上壁に対して第1の角度を形成する内側壁と、前記上壁の前記外縁部沿いに延設、連結され前記上壁に対して第2の角度を形成する外側壁とを含み、前記内側壁と外側壁の各々は前記上壁に略平行なフランジ部にて終端されて成るL形製品の製造方法において、
金属製シート材料を準備する段階と、
絞り加工ダイ組立体を準備する段階と、
前記金属製シート材料を前記絞り加工ダイ組立体によってプレス加工して、前記L形製品の前記L形の平坦な上壁の第1と第2の脚部に対応した第1と第2の脚部を有したL形の平坦な上壁と、完成した前記L形製品の内側壁と外側壁に対応した内側壁および外側壁と、完成した前記L形製品のフランジ部に対応したフランジ部とを含んだ中間製品を製造する段階とを含み、
前記中間製品は、前記第1の脚部の先端に隣接した第1の領域と、前記第2の脚部に隣接した第2の領域とを含み、前記第1の領域では、前記中間製品の前記上壁と前記内側壁および外側壁との間の各々の角度は、完成した前記L形製品の前記第1と第2の角度に実質的に一致する形状を有し、前記第2の領域では、前記上壁と前記内側壁および外側壁との間の各々の角度が前記第2の脚部へ向けて次第に増加しており、
前記方法は、更に、
曲げ加工ダイ組立体を準備する段階と、
前記中間製品を前記曲げ加工ダイ組立体によって更にプレス加工して完成した前記L形製品を製造する段階とを含んで成るL形製品の製造方法。 - 前記絞り加工ダイ組立体は、前記中間製品の上壁、内側壁および外側壁の形状に対応した形状の凹部と、該凹部の周縁部に沿って延在するフランクとを有した絞り加工ダイと、前記絞り加工ダイの前記フランクと共に前記金属製シート材料をクランプするクランプ面を有したホルダーと、前記金属製シート材料を前記絞り加工ダイの前記凹部内に押入するように動作可能に設けられたパンチとを具備する請求項1に記載のL形製品の製造方法。
- 前記ホルダーのクランプ面は、前記中間製品の第2の脚部に隣接しかつ前記第1の脚部の先端とは反対側の縁部に相当する前記ブランクの部分をクランプしない形状となっている請求項2に記載のL形製品の製造方法。
- 前記中間製品は、前記第2の脚部に隣接しかつ前記第1の脚部の先端とは反対側の縁部の近傍では、前記内側壁が前記上壁と略同一平面内にある請求項3に記載のL形製品の製造方法。
- 前記曲げ加工ダイ組立体は、完成した前記L形製品の形状に対応した形状のアンビルと、前記アンビルと共に前記中間製品の上壁をクランプする当接面を有したパッドと、前記中間製品を前記アンビルに押圧する曲げ加工ダイとを具備する請求項1に記載のL形製品のL形製品の製造方法。
- 前記アンビルは、前記パッドの前記当接面に対面する平坦な上面を含み、前記中間製品のL形の上壁が前記アンビルの上面と前記パッドの当接面との間に配置され、
該曲げ加工ダイ組立体によるプレス加工中、前記中間製品の上壁を前記アンビルの上面と前記パッドの当接面とによりクランプした状態で、前記L形製品の内側壁および内側フランジ部、外側壁および外側フランジ部が前記曲げ加工ダイによって曲げ加工される請求項5に記載のL形製品の製造方法。 - 完成した前記L形製品は前記外縁部沿いに前記第1と第2の脚部の間で円弧状に凹んだ外側湾曲部分を含んでおり、
前記アンビルは前記上面から突出した峰部を有し、前記パッドが前記アンビルの前記峰部を受容する凹所を含んでおり、完成した前記L形製品の前記円弧状に凹んだ外側湾曲部分に沿って前記上面に外方に突出したリブが形成されれるる請求項6に記載のL形製品の製造方法。 - 前記L形製品は、前記内側壁沿いに前記第1と第2の脚部の間が円弧状に湾曲した内側湾曲部分を有しており、
前記内側壁の前記フランジ部は、前記内側湾曲部分の中央より前記第1の脚部の先端方向に100mmの範囲において、25-100mmの幅を有している請求項1~7の何れか1項に記載のL形製品の製造方法。 - 前記内側壁の前記内側湾曲部分は10-300mmの曲率半径を有する請求項1~7の何れか1項に記載のL形製品の製造方法。
- 外側壁の前記外側湾曲部分は200-1000mmの曲率半径を有する請求項1~7の何れか1項に記載のL形製品の製造方法。
- 前記金属製シート材料は、400-1600MPaの破断強度を有する請求項1~7の何れか1項に記載のL形製品の製造方法。
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EP11843425.7A EP2644293B1 (en) | 2010-11-24 | 2011-11-24 | Method for manufacturing l-shaped product |
US13/989,095 US9211579B2 (en) | 2010-11-24 | 2011-11-24 | Method of producing L-shaped product |
CN201180056634.3A CN103237611B (zh) | 2010-11-24 | 2011-11-24 | L形产品的制造方法 |
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KR20170139646A (ko) | 2015-06-02 | 2017-12-19 | 제이에프이 스틸 가부시키가이샤 | 프레스 성형 방법 및 프레스 성형 금형 |
JP2017170506A (ja) * | 2016-03-25 | 2017-09-28 | 新日鐵住金株式会社 | パネル状成形品の製造方法 |
CN107321846B (zh) * | 2016-08-12 | 2019-11-22 | 江苏合润汽车车身模具有限公司 | 一种覆盖件棱线整形锐化方法及其整形模 |
CN107321846A (zh) * | 2016-08-12 | 2017-11-07 | 江苏合润汽车车身模具有限公司 | 一种覆盖件棱线整形锐化方法及其整形模 |
WO2020004610A1 (ja) * | 2018-06-29 | 2020-01-02 | 日本製鉄株式会社 | プレス成形品の製造方法および製造設備 |
JP6680416B1 (ja) * | 2018-06-29 | 2020-04-15 | 日本製鉄株式会社 | プレス成形品の製造方法および製造設備 |
JP2020124726A (ja) * | 2019-02-05 | 2020-08-20 | フタバ産業株式会社 | プレス成形品及びプレス加工方法 |
JP7144338B2 (ja) | 2019-02-05 | 2022-09-29 | フタバ産業株式会社 | プレス加工方法 |
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JP5836972B2 (ja) | 2015-12-24 |
EP2644293A1 (en) | 2013-10-02 |
ES2600402T3 (es) | 2017-02-08 |
US9211579B2 (en) | 2015-12-15 |
US20130239645A1 (en) | 2013-09-19 |
EP2644293A4 (en) | 2015-09-16 |
EP2644293B1 (en) | 2016-07-27 |
CN103237611B (zh) | 2015-06-24 |
CN103237611A (zh) | 2013-08-07 |
JPWO2012070623A1 (ja) | 2014-05-19 |
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