WO2015125723A1 - プレス成形方法およびプレス製品の製造方法並びにプレス成形装置 - Google Patents
プレス成形方法およびプレス製品の製造方法並びにプレス成形装置 Download PDFInfo
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- WO2015125723A1 WO2015125723A1 PCT/JP2015/054091 JP2015054091W WO2015125723A1 WO 2015125723 A1 WO2015125723 A1 WO 2015125723A1 JP 2015054091 W JP2015054091 W JP 2015054091W WO 2015125723 A1 WO2015125723 A1 WO 2015125723A1
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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
- B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
- B21D11/08—Bending by altering the thickness of part of the cross-section of the work
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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
- B21D22/06—Stamping using rigid devices or tools having relatively-movable die parts
Definitions
- the present invention relates to press forming of a hat-shaped or U-shaped cross-sectional product using a metal plate, and in particular, a press-forming method and press of a product curved in the longitudinal direction when viewed from the vertical wall direction (side).
- the present invention relates to a manufacturing method as a product and a press molding apparatus, that is, a press mold used in those methods.
- Camber back is a failure phenomenon in a product having a curvature in the longitudinal direction, where the curvature returns after press molding, that is, the curvature radius becomes larger than the target curvature radius. Camberback is noticeable in products with low wall height and low cross-sectional rigidity.
- Patent Document 1 discloses a technique for suppressing camber back by making the vertical wall height smaller than the difference between the hat head radius of curvature and the flange radius of curvature as a countermeasure for camber back of a product having a hat-shaped cross section. Is disclosed. However, with this technique, the product shape is restricted, and therefore cannot be applied to all product shapes.
- Patent Document 2 discloses a technique for suppressing camber back by pressing and deforming the top of an arcuate curved portion into a concave shape in the anti-bulging direction during press molding to reduce the tensile residual stress at the top. It is disclosed. However, in this technique, since the concave shape is formed on the top of the arcuate curved portion as shown in the embodiment, not only the product shape is limited, but if the concave shape is not necessary, a list after that A shape correction process such as a like process is required.
- the present invention solves the above-mentioned problems, and press molding that can suppress the camber back of a product having a hat-shaped or U-shaped cross-sectional shape and curved in the longitudinal direction when viewed from the vertical wall direction (side). It is an object of the present invention to provide a method, a manufacturing method as a press product, and a press molding apparatus, that is, a die press molding die used in these methods.
- the present inventor used a blank slightly longer than the length in the longitudinal direction along the curved portion of the product shape, and compressed only the curvature portion which is the main factor of camber back.
- the press molding method of the present invention is: When a product having a hat-shaped or U-shaped cross-sectional shape and having a longitudinal shape having a curved portion in the middle portion and straight portions adjacent to the intermediate portion is pressed from a blank, First, bring both ends of the blank longer than the length along the longitudinal direction of the product to be molded closer to the distance between both ends of the product to be molded, Next, in a state in which both ends are close to each other, the blank portion corresponding to the straight portion of the product to be molded is cut into a hat-shaped or U-shaped cross section before the blank portion corresponding to the curved portion of the product to be molded.
- the length of the blank portion corresponding to the curved portion of the product to be molded is left with respect to the length of the curved portion.
- the blank portion corresponding to the curved portion of the product to be molded is press-molded into a curved longitudinal shape while being molded into a hat-shaped or U-shaped cross-sectional shape.
- the gist is to apply a compressive stress in the longitudinal direction to the blank portion corresponding to the curved portion of the product to be molded.
- the manufacturing method of the press product of the present invention includes: When a product having a hat-shaped or U-shaped cross-sectional shape and a longitudinal shape having a curved portion in the middle portion and linear portions on both sides thereof is press-molded from a blank and manufactured as a pressed product, First, bring both ends of the blank longer than the length along the longitudinal direction of the product to be molded closer to the distance between both ends of the product to be molded, Next, in a state in which both ends are close to each other, the blank portion corresponding to the straight portion of the product to be molded is cut into a hat-shaped or U-shaped cross section before the blank portion corresponding to the curved portion of the product to be molded.
- the length of the blank portion corresponding to the curved portion of the product to be molded is left with respect to the length of the curved portion.
- the blank portion corresponding to the curved portion of the product to be molded is press-molded into a curved longitudinal shape while being molded into a hat-shaped or U-shaped cross-sectional shape.
- the gist is to apply a compressive stress in the longitudinal direction to the blank portion corresponding to the curved portion of the product to be molded.
- the press molding apparatus of this invention is A press molding apparatus used for press-molding a product having a hat-shaped or U-shaped cross-sectional shape and having a longitudinal shape having a curved portion in the middle portion and linear portions adjacent to the middle portion from a blank, With the upper and lower molds facing each other, The lower mold has a blank holding portion that positions the both ends of the blank longer than the length along the longitudinal direction of the product to be molded in a state in which they are close to each other up to the distance between both ends of the product to be molded, One of the upper mold and the lower mold has a molded portion having a shape corresponding to the shape of the product to be molded, The other of the lower mold and the lower mold has a shape corresponding to the shape of the product to be molded, and has a molded portion that is divided into a curved portion and a linear portion existing on both sides thereof, The linear part of the molding part is closer to the one of the upper mold and the lower mold than the curved part of the molding part so as
- a longitudinal shape having a hat-shaped or U-shaped cross-sectional shape and a curved portion in the middle portion and straight portions adjacent to the middle portion is provided.
- both ends of the blank longer than the length along the longitudinal direction of the product to be molded are brought closer to each other up to the distance between both ends of the product to be molded, and then both ends are brought closer.
- the blank portion corresponding to the straight portion of the product to be molded is press-molded toward the hat-shaped or U-shaped cross section before the blank portion corresponding to the curved portion of the product to be molded.
- the length of the blank portion corresponding to the curved portion of the product to be molded is left with respect to the length of the curved portion, and then the molding is performed with the remaining length remaining.
- the blank part corresponding to the curved part of the product to be molded is press-molded into a longitudinal shape that is curved while being molded into a hat-shaped or U-shaped cross-sectional shape. In order to apply a longitudinal compressive stress to the part, since the tensile stress in the longitudinal direction is offset by the compressive stress after the press molding in the curved portion of the molded product, there is little or no residual stress.
- Camberback caused by this can be effectively prevented even for products with low wall height and low cross-sectional rigidity, with no restrictions on product shape, and having a hat-shaped or U-shaped cross-sectional shape It becomes possible to form a product curved in the longitudinal direction having a curved portion at the intermediate portion and linear portions adjacent to the middle portion with good dimensional accuracy.
- the product in which the blank holding portion of the lower mold among the opposed upper mold and lower mold forms both ends of the blank longer than the length along the longitudinal direction of the product to be molded. are positioned close to each other up to the distance between both ends of each of the molded parts corresponding to the shape of the product to be molded, one of the upper mold and the lower mold, and the other of the upper mold and the lower mold.
- a product having a longitudinal shape having a hat-shaped or U-shaped cross-sectional shape and a curved portion in the middle portion and straight portions on both sides thereof is press-molded in cooperation with the approaching movement.
- the other mold part of the upper mold and the lower mold is molded to the one of the upper mold and the lower mold out of the curved part and the linear part existing on both sides thereof.
- the straight part held closer to the curved part of the part so as to be able to be pushed in with a reaction force is in cooperation with the straight part of the one molded part of the upper mold and the lower mold.
- the length of the blank portion corresponding to the curved portion is left with respect to the length of the curved portion, and then the curved portion of the other molded portion of the upper mold and the lower mold is the upper mold and the lower mold.
- the length of the remaining part due to the cooperation with the curved part of one of the molded parts The blank portion corresponding to the curved portion of the product to be molded is pressed into a curved longitudinal shape while being molded into a hat-shaped or U-shaped cross-sectional shape, and the compressive stress in the longitudinal direction is applied to the blank portion. Is granted.
- reaction force means being held by an elastic member such as a metal spring or a rubber-like elastic body, as well as a hydraulic, pneumatic or hydraulic / pneumatic cushion of a press machine It is held by a device, a gas spring or the like, and includes a case where the upper die is pushed down to the retreat limit position while applying a reaction force to the other party's pressing force, and is returned to the initial position as the upper die is raised.
- an elastic member such as a metal spring or a rubber-like elastic body, as well as a hydraulic, pneumatic or hydraulic / pneumatic cushion of a press machine
- the press molding apparatus of the present invention since the compressive stress in the longitudinal direction is applied to the blank portion corresponding to the curved portion of the product to be molded, the longitudinal direction is applied to the curved portion of the molded product after press molding. Since the tensile stress of the material is offset by the compressive stress and there is little or no residual stress, the occurrence of camber back due to the tensile stress in the longitudinal direction is effectively prevented even for products with low wall height and low cross-sectional rigidity.
- the product has no restrictions on the product shape, has a hat-shaped or U-shaped cross-sectional shape, and has a longitudinally curved product having a curved portion in the middle portion and straight portions on both sides thereof, and has good dimensional accuracy. Molding becomes possible.
- the longitudinal length L of the blank is relative to the length L0 along the longitudinal direction of the product to be molded. If it exceeds 1.05 times, the possibility of buckling due to compressive stress increases, so that the longitudinal length L of the blank is greater than the length L0 along the longitudinal direction of the product to be molded. It is preferably smaller than 05 ⁇ L0 or equal to 1.05 ⁇ L0, that is, L0 ⁇ L ⁇ 1.05 ⁇ L0.
- the side view which shows typically the typical shape of the press molding method of this invention, the manufacturing method of the press product of this invention, and the application product of the press molding apparatus of this invention, and its AA 'position in a cross-sectional view is there. It is a cross-sectional view which shows typically the example of the normal press molding die which press-molds the said product shape. It is explanatory drawing which shows typically the camber back of the curved product press-molded by the conventional method with the said press-molding metal mold
- 1 is a longitudinal sectional view schematically showing a configuration of a press mold of an embodiment of a press molding apparatus of the present invention, which implements an embodiment of a press molding method of the present invention and a press product manufacturing method of the present invention.
- (A), (b), and (c) show the states before blank molding, during molding, and at the end of molding (at the bottom dead center of the upper mold), respectively.
- the longitudinal section which shows typically the composition of the press molding die of other one embodiment of the press molding device of the present invention which carries out the other embodiment of the press molding method of the present invention, and the manufacturing method of the press product of the present invention (A), (b), (c) shows a state before forming a blank, during forming, and at the end of forming (at the bottom dead center of the upper die), respectively.
- FIG. 1 generally a hat-shaped or U-shaped cross-sectional shape, and a product curved in the longitudinal direction, as shown in FIG.
- tensile stress occurs outside the curve in the longitudinal direction of the product
- compressive stress occurs inside
- the residual bending moment is used to reduce this stress difference.
- the curvature radius of the curved portion becomes larger as shown by the solid line after releasing from the molded shape shown by the broken line at the bottom dead center of the upper mold, and this phenomenon is called camber back. Will occur.
- This phenomenon is a kind of springback deformation, and in steel plates, the amount of return increases as the strength of the steel plate increases.
- the present invention relates to a press molding method and a press molding apparatus, that is, a press mold, capable of applying a compressive stress only to a portion to which a compressive stress needs to be applied, that is, a curved portion.
- FIG. 4 is a longitudinal cross-sectional view schematically showing the configuration of a press mold of an embodiment of the press molding apparatus of the present invention, which implements the embodiment of the press molding method of the present invention and the press product manufacturing method of the present invention.
- FIG. 4A, FIG. 4B, and FIG. 4C show states of the blank before molding, during molding, and at the end of molding (at the bottom dead center of the upper mold), respectively.
- the press-molding die of this embodiment has a curved portion at an intermediate portion and its adjacent side along the longitudinal direction so that a side shape is shown on the left side in FIG. 1 and an AA ′ cross section (transverse cross section) is shown on the right side.
- a side shape is shown on the left side in FIG. 1
- an AA ′ cross section is shown on the right side.
- the cross-sectional shapes of the upper and lower mold parts of the press mold of this embodiment are shown in FIG. As shown in FIG. 2, it has a hat shape corresponding to the cross-sectional shape of the product.
- the press mold of this embodiment includes an upper and lower molds facing each other, and a blank set base adjacent to the lower mold.
- the lower mold is divided into a lower mold 3 corresponding to the curved portion of the product and lower molds 1 and 2 corresponding to the straight portions adjacent to the curved portion of the product.
- a cushion pin connected to a cushion device of a normal press machine (not shown) to which the press mold is attached is held so as to be able to be pushed in with a reaction force.
- the lower molds 1 and 2 are structured to be supported by cushion pins, but there is no problem even if the structure is supported by a metal spring or a gas spring.
- the operation of the press mold of this embodiment is as follows. First, the blank set stand and the lower die 3 are attached to the bolster of the press machine via a base plate (not shown), the upper die is attached to the slide of the press machine, and the lower die 1 to 3 is moved up and down by the slide. On the other hand, the upper mold can be moved up and down, and the lower molds 1 and 2 are lifted and supported by cushion pins that are connected to a cushion device of the press machine and penetrate the bolster. And after raising an upper mold
- the surface of the blank set table on which the blank is placed is preferably inclined in a side view in order to facilitate pushing of the blank between the blank set tables.
- the longitudinal length L of the blank to be used needs to be longer than the longitudinal length L0 along the curvature of the hat-shaped bottom of the product. However, if it is too long, it causes buckling, so here L0 ⁇ L ⁇ 1.05 ⁇ L0.
- the upper mold After placing the blank on the blank set table, the upper mold is lowered with the slide of the press machine, and the blank is pushed between the blank set tables with the upper mold, and then the upper mold as shown in FIG.
- the lower mold 1 and the lower mold 2 are formed on both end portions of the blank corresponding to the linear portion of the product. At that time, a material surplus in the longitudinal direction is generated in an intermediate portion (a portion on the lower mold 3) of the blank corresponding to the curved portion of the product.
- FIG. 4 (c) while the both ends of the blank are sandwiched between the upper mold and the lower molds 1 and 2, the intermediate part where the blank material is left is the product between the upper mold and the lower mold 3. Molded into a curved part. Thereby, a compressive stress can be given to the curved part of the product to shape
- the longitudinal compressive stress is applied to the blank portion corresponding to the curved portion of the product to be molded. Therefore, after press molding, since the tensile stress in the longitudinal direction is offset by the compressive stress in the molded product, that is, the curved portion of the pressed product, the camber is caused by the tensile stress in the longitudinal direction.
- FIG. 5 shows another embodiment of the press molding method of the present invention and the method of manufacturing a press product of the present invention, and the press molding apparatus of the present invention having a structure in which the upper die is divided unlike the previous embodiment.
- It is a longitudinal cross-sectional view which shows typically the structure of the press-molding die of other one Embodiment, (a), (b), (c) is before shaping
- the upper mold is divided into the upper molds 1 and 2 corresponding to the straight part of the product and the curved part of the product. It is divided into the corresponding upper mold 3 and has a structure in which a metal spring or a gas spring is incorporated in the upper molds 1 and 2 corresponding to the linear portion of the product so that they can be pushed in with a reaction force. ing.
- the blank portion corresponding to the linear portion of the product does not need to be completely formed at the initial stage of molding, and the blank portion corresponding to the curved portion of the product is being formed. It is sufficient if the portion corresponding to the straight line portion is restrained.
- the shape may not be a hat shape with a flange portion, but may be a U shape without a flange portion.
- the press mold may hold the lower mold part corresponding to the linear part of the product with a metal spring or a gas spring instead of the cushion device.
- a longitudinal compressive stress is applied to the blank portion corresponding to the curved portion of the product to be molded.
- the occurrence of camber back due to the tensile stress in the longitudinal direction is It can effectively prevent products with low profile and low cross-sectional rigidity, has no product shape restrictions, has a hat-shaped or U-shaped cross-sectional shape, and has a curved portion in the middle and straight portions on both sides. It is possible to mold the product curved in the longitudinal direction with good dimensional accuracy.
Abstract
Description
ハット形もしくはコの字形の横断面形状を有するとともに中間部の湾曲部とその両隣の直線部とを持つ長手方向形状を有する製品をブランクからプレス成形するに際し、
先ず、成形する製品の長手方向に沿った長さよりも長いブランクの両端を、成形する製品の両端間の距離まで互いに近寄らせ、
次いで、その両端が近寄った状態で、成形する製品の直線部に対応するブランクの部分を、成形する製品の湾曲部に対応するブランクの部分よりも先にハット形もしくはコの字形の横断面形状に向けてプレス成形しつつ拘束することで、成形する製品の湾曲部に対応するブランクの部分の長さをその湾曲部の長さに対して余らせ、
次いで、その長さが余った状態で、成形する製品の湾曲部に対応するブランクの部分を、ハット形もしくはコの字形の横断面形状に成形しつつ湾曲した長手方向形状にプレス成形することにより、成形する製品の湾曲部に対応するブランクの部分に長手方向の圧縮応力を付与することを要旨とするものである。
また、本発明のプレス製品の製造方法は、
ハット形もしくはコの字形の横断面形状を有するとともに中間部の湾曲部とその両隣の直線部とを持つ長手方向形状を有する製品をブランクからプレス成形してプレス製品として製造するに際し、
先ず、成形する製品の長手方向に沿った長さよりも長いブランクの両端を、成形する製品の両端間の距離まで互いに近寄らせ、
次いで、その両端が近寄った状態で、成形する製品の直線部に対応するブランクの部分を、成形する製品の湾曲部に対応するブランクの部分よりも先にハット形もしくはコの字形の横断面形状に向けてプレス成形しつつ拘束することで、成形する製品の湾曲部に対応するブランクの部分の長さをその湾曲部の長さに対して余らせ、
次いで、その長さが余った状態で、成形する製品の湾曲部に対応するブランクの部分を、ハット形もしくはコの字形の横断面形状に成形しつつ湾曲した長手方向形状にプレス成形することにより、成形する製品の湾曲部に対応するブランクの部分に長手方向の圧縮応力を付与することを要旨とするものである。
ハット形もしくはコの字形の横断面形状を有するとともに中間部の湾曲部とその両隣の直線部とを持つ長手方向形状を有する製品をブランクからプレス成形する際に用いられるプレス成形装置であって、
相対する上型および下型を備え、
下型が、成形する製品の長手方向に沿った長さよりも長いブランクの両端を成形する製品の両端間の距離まで互いに近寄らせた状態で位置決めするブランク保持部を有し、
上型および下型のうちの一方が、成形する製品の形状に対応する形状の成形部を有し、
下型および下型のうちの他方が、成形する製品の形状に対応する形状を持つとともに湾曲部とその両隣に存在する直線部とに分割されている成形部を有し、
成形部の直線部が、成形部の湾曲部より先にブランクの成形を開始するように、上型および下型のうちの前記一方に対し成形部の湾曲部よりも接近して、反力を伴って押し込み可能に保持されていることを特徴とするものである。
Claims (7)
- ハット形もしくはコの字形の横断面形状を有するとともに中間部の湾曲部とその両隣の直線部とを持つ長手方向形状を有する製品をブランクからプレス成形するに際し、
先ず、成形する製品の長手方向に沿った長さよりも長いブランクの両端を、成形する製品の両端間の距離まで互いに近寄らせ、
次いで、その両端が近寄った状態で、成形する製品の直線部に対応するブランクの部分を、成形する製品の湾曲部に対応するブランクの部分よりも先にハット形もしくはコの字形の横断面形状に向けてプレス成形しつつ拘束することで、成形する製品の湾曲部に対応するブランクの部分の長さをその湾曲部の長さに対して余らせ、
次いで、その長さが余った状態で、成形する製品の湾曲部に対応するブランクの部分を、ハット形もしくはコの字形の横断面形状に成形しつつ湾曲した長手方向形状にプレス成形することにより、成形する製品の湾曲部に対応するブランクの部分に長手方向の圧縮応力を付与することを特徴とするプレス成形方法。 - ハット形もしくはコの字形の横断面形状を有するとともに中間部の湾曲部とその両隣の直線部とを持つ長手方向形状を有する製品をブランクからプレス成形してプレス製品として製造するに際し、
先ず、成形する製品の長手方向に沿った長さよりも長いブランクの両端を、成形する製品の両端間の距離まで互いに近寄らせ、
次いで、その両端が近寄った状態で、成形する製品の直線部に対応するブランクの部分を、成形する製品の湾曲部に対応するブランクの部分よりも先にハット形もしくはコの字形の横断面形状に向けてプレス成形しつつ拘束することで、成形する製品の湾曲部に対応するブランクの部分の長さをその湾曲部の長さに対して余らせ、
次いで、その長さが余った状態で、成形する製品の湾曲部に対応するブランクの部分を、ハット形もしくはコの字形の横断面形状に成形しつつ湾曲した長手方向形状にプレス成形することにより、成形する製品の湾曲部に対応するブランクの部分に長手方向の圧縮応力を付与することを特徴とするプレス製品の製造方法。 - 前記ブランクの長手方向長さLが、成形する製品の長手方向に沿った長さL0よりも大きくかつ1.05×L0よりも小さいか1.05×L0に等しいことを特徴とする、請求項1または2記載の方法。
- ハット形もしくはコの字形の横断面形状を有するとともに中間部の湾曲部とその両隣の直線部とを持つ長手方向形状を有する製品をブランクからプレス成形する際に用いられるプレス成形装置において、
相対する上型および下型を備え、
下型が、成形する製品の長手方向に沿った長さよりも長いブランクの両端を成形する製品の両端間の距離まで互いに近寄らせた状態で位置決めするブランク保持部を有し、
上型および下型のうちの一方が、成形する製品の形状に対応する形状の成形部を有し、
下型および下型のうちの他方が、成形する製品の形状に対応する形状を持つとともに湾曲部とその両隣に存在する直線部とに分割されている成形部を有し、
成形部の直線部が、成形部の湾曲部より先にブランクの成形を開始するように、上型および下型のうちの前記一方に対し成形部の湾曲部よりも接近して、反力を伴って押し込み可能に保持されていることを特徴とするプレス成形装置。 - 前記上型が、成形する製品の形状に対応する形状の成形部を有し、
前記下型が、成形する製品の形状に対応する形状を持つとともに湾曲部とその両隣に存在する直線部とに分割されている成形部を有し、
前記下型の成形部の直線部が、前記下型の成形部の湾曲部より先にブランクの成形を開始するように、前記上型に対し前記下型の成形部の湾曲部よりも接近して、クッション装置により押し込み可能に保持されていることを特徴とする、請求項4記載のプレス成形装置。 - 前記下型が、成形する製品の形状に対応する形状の成形部を有し、
前記上型が、成形する製品の形状に対応する形状を持つとともに湾曲部とその両隣に存在する直線部とに分割されている成形部を有し、
前記上型の成形部の直線部が、前記上型の成形部の湾曲部より先にブランクの成形を開始するように、前記下型に対し前記上型の成形部の湾曲部よりも接近して、弾性部材により押し込み可能に保持されていることを特徴とする、請求項4記載のプレス成形装置。 - 前記ブランクの長手方向長さLが、成形する製品の長手方向に沿った長さL0よりも大きくかつ1.05×L0よりも小さいか1.05×L0に等しいことを特徴とする、請求項4から6までの何れか1項記載のプレス成形装置。
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JP2018061979A (ja) * | 2016-10-13 | 2018-04-19 | 三恵工業株式会社 | パイプ製造方法とこれに用いるプレス装置 |
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MX2017013305A (es) * | 2015-04-22 | 2018-02-19 | Nippon Steel & Sumitomo Metal Corp | Metodo de fabricacion de componente prensado, componente prensado y aparato de prensado. |
JP6500927B2 (ja) * | 2017-03-28 | 2019-04-17 | Jfeスチール株式会社 | プレス成形装置及びプレス成形品の製造方法 |
JP6708182B2 (ja) * | 2017-08-07 | 2020-06-10 | Jfeスチール株式会社 | プレス成形品の製造方法 |
KR102602087B1 (ko) * | 2019-05-20 | 2023-11-13 | 제이에프이 스틸 가부시키가이샤 | 프레스 부품의 제조 방법 및, 형상 교정용 금형 |
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EP3112041B1 (en) | 2020-09-02 |
MX370432B (es) | 2019-12-13 |
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EP3112041A4 (en) | 2017-08-23 |
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