WO2021241025A1 - プレス成形金型及びプレス成形方法 - Google Patents
プレス成形金型及びプレス成形方法 Download PDFInfo
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- WO2021241025A1 WO2021241025A1 PCT/JP2021/014848 JP2021014848W WO2021241025A1 WO 2021241025 A1 WO2021241025 A1 WO 2021241025A1 JP 2021014848 W JP2021014848 W JP 2021014848W WO 2021241025 A1 WO2021241025 A1 WO 2021241025A1
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- Prior art keywords
- flange
- molding
- press
- forming
- side portion
- Prior art date
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- 238000000034 method Methods 0.000 title claims description 40
- 238000000465 moulding Methods 0.000 claims description 107
- 238000005452 bending Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 description 31
- 230000037303 wrinkles Effects 0.000 description 26
- 238000010586 diagram Methods 0.000 description 16
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000005336 cracking Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000003825 pressing Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
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Classifications
-
- 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
- B21D19/00—Flanging or other edge treatment, e.g. of tubes
- B21D19/08—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws
-
- 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
- B21D22/22—Deep-drawing with devices for holding the edge of the blanks
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
- B21D24/005—Multi-stage 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
Definitions
- the present invention relates to a press forming die (press forming dies) for press forming a member (part) such as an automobile part (automotive part) from a metal sheet, and a press forming method, in particular, a surface.
- a press-molded product having a top plate portion (top portion) having an uneven portion (convex and concave part) in the in-plane direction and a flange portion (flange portion) continuously formed on the top plate portion. (Press formed part) related to press forming dies and press forming methods.
- high-strength steel sheets are being widely used for automobile parts in order to reduce the weight of automobile bodies due to environmental problems.
- high-strength steel sheets have poor ductility as compared with low-strength steel sheets, and are prone to fracture during processing.
- thinning is also performed at the same time for further weight reduction, so buckling of the steel sheet is likely to occur and wrinkles are likely to occur during press forming.
- press forming method for suppressing breakage and wrinkles.
- Patent Document 1 wrinkles and stretch flanges inside the product are used by using a wrinkle holding pad (blank holder) that is driven separately from the punch and die for press.
- a press molding method for manufacturing an automobile part that is prone to cracking (fracture) without forming defects is disclosed. According to the method disclosed in Patent Document 1, it is said that automobile parts that are prone to wrinkles and cracks inside the product can be manufactured without molding defects.
- Patent Document 1 is a method that requires the inside of the product away from the flange to be held down by using a wrinkle suppressing pad. Therefore, there is a problem that it cannot be applied to a shape that causes wrinkles or cracks in the flange portion itself.
- the present invention has been made in view of the above problems, and an object thereof can be applied to a press-molded product in which wrinkles and cracks occur in the flange itself, and a press-molded die capable of simultaneously suppressing wrinkles and cracks in the flange. And to provide a press molding method.
- the convex side portion (convex outer edge part) protruding outward in the in-plane direction and the concave side portion (concave outer edge part) recessing inward in the in-plane direction are connecting.
- a press-molded product having a top plate portion having a continuous uneven side portion (convex and concave outer edge part) via an outer edge part) and a continuous flange portion formed on the uneven side portion in the top plate portion.
- the upper mold is provided with a lower pad (lower blank holder) and an upper pad (upper blank holder) for sandwiching a blank in cooperation with the above mold, and the upper mold is a convex flange molding that forms a flange portion on the convex side portion.
- the connecting side flange forming portion protrudes from the flange forming portion in the press forming direction, and the connecting side flange forming portion is inclined from the convex side flange forming portion toward the concave side flange forming portion, and the lower pad is the said. It has a shape corresponding to each of the convex side flange molded part, the concave side flange molded part and the connecting side flange molded part formed in the upper mold, and the convex side flange molded part is formed on the convex side part at the initial stage of molding.
- the flange portion is formed by the flange portion, and the torsional deformation part having a shape continuously twisted toward the concave side portion is formed on the flange portion by the connecting side flange forming portion.
- the twisted shape portion can be formed into the flange portion by the connecting side flange forming portion, and the flange portion can be formed into the concave side portion by the concave side flange forming portion to form a target shape.
- the press forming method according to the present invention includes a top plate portion having a convex side portion protruding outward in the in-plane direction and a concave side portion recessed inward in the in-plane direction having a continuous uneven side portion via a connecting side portion.
- the flange portion is formed on the convex side portion by the convex side flange forming portion.
- the initial molding step of continuously molding the twisted shape portion of the shape twisted toward the concave side portion by the connecting side flange molding portion on the flange portion, and pressing the upper die and the lower pad. After moving in the molding direction, the twisted shape portion is formed into the flange portion by the connecting side flange forming portion, and the flange portion is formed into the concave side portion by the concave side flange forming portion to form the target shape. Including the molding process.
- the press-molded die According to the press-molded die according to the present invention, it can be applied to a press-molded product in which wrinkles and cracks occur in the flange itself, and wrinkles and cracks in the flange can be suppressed at the same time. Moreover, the mold can be press-molded by one action, which is a movement in the same direction, and can be efficiently press-molded.
- FIG. 1 is an explanatory diagram of a press-molded die according to an embodiment of the present invention (No. 1).
- FIG. 2 is an explanatory diagram of a press-molded die according to an embodiment of the present invention (No. 2).
- FIG. 3 is an explanatory diagram of a press-molded die according to an embodiment of the present invention (No. 3).
- FIG. 4 is an explanatory diagram of a press molding die according to an embodiment of the present invention (No. 4).
- FIG. 5 is an explanatory diagram of a press molding method according to an embodiment of the present invention.
- FIG. 6 is an explanatory diagram of a state of a die in a step before the start of molding of the press molding method according to the embodiment of the present invention (No. 1).
- FIG. 1 is an explanatory diagram of a press-molded die according to an embodiment of the present invention (No. 1).
- FIG. 2 is an explanatory diagram of a press-molded die according to an embodiment of the present invention (No.
- FIG. 7 is an explanatory diagram of the state of the mold in the step before the start of molding of the press molding method according to the embodiment of the present invention (No. 2).
- FIG. 8 is an explanatory diagram of a mold state in the initial molding step of the press molding method according to the embodiment of the present invention.
- FIG. 9 is an enlarged view of the molded product in the initial molding step of FIG. 5 as viewed from the direction of the thick arrow of the AA portion.
- FIG. 10 is an explanatory diagram illustrating a mechanism by which the generation of wrinkles is suppressed in the initial molding process.
- FIG. 11 is an explanatory diagram of the state of the mold in the late molding step of the press molding method according to the embodiment of the present invention.
- FIG. 12 is an enlarged view seen from the direction of the thick arrow of the BB portion in the target shape of the late molding process of FIG.
- FIG. 13 is an explanatory diagram illustrating a mechanism by which the occurrence of cracks is suppressed in the late molding process.
- FIG. 14 is an explanatory diagram illustrating a target shape in the embodiment and problems that occur in the molding process of the target shape.
- FIG. 15 is an explanatory diagram illustrating a mechanism in which wrinkles and cracks occur in the molding process of the target shape shown in FIG.
- the press-molded product 1 shown in FIG. 14 is a perspective view of a slide door rail, which is an automobile part, and has a top plate portion 3 and a flange portion 5.
- the top plate portion 3 has a convex portion (convex part) 7 protruding outward in the in-plane direction and a concave portion (concave part) 9 adjacent to the convex portion 7 inwardly recessed in the in-plane direction.
- the outer periphery of the top plate portion 3 is a connecting side connecting the convex side portion 11a which is the outer periphery of the convex portion 7, the concave side portion 11b which is the outer periphery of the concave portion 9, and the convex side portion 11a and the concave side portion 11b.
- the uneven side portion 11 is formed by the portion 11c.
- a flange portion 5 is formed on the uneven side portion 11.
- a bent portion is formed on the side portion of the top plate portion 3 facing the uneven side portion 11 on which the flange portion 5 is formed, but in FIG. 14, the bent portion is formed. Illustration is omitted.
- the flange portion 5 formed on the convex side portion 11a shrinks and becomes flange forming (a portion surrounded by a round broken line in the figure). , Wrinkles are likely to occur due to excess metal.
- stretch flange forming occurs (part b surrounded by a round broken line in the figure), and cracking due to lack of material (metal shortage) is likely to occur.
- FIG. 15 is a diagram illustrating a material flow in the molding process in the EE portion surrounded by the broken line in FIG. 14, and FIGS. 14 is viewed from the top (FIG. 15 (a)) and side (FIG. 15 (b)). )) Indicates the state.
- the broken line is the tip of the blank before molding
- the solid line is the end edge of the flange portion 5 molded into the target shape.
- points D and B in the figure correspond to the R stop (the boundary between a curve and a straight line) of the convex side portion 11a in the blank before molding, and corresponding to these, D in the top view.
- intersections of the line perpendicular to the end edge of the target shape from the points and B points and the end edge of the target shape are the D'point and the B'point.
- the points A and E in the figure correspond to the R stop of the concave side portion 11b in the blank before molding, and corresponding to these points, the end sides of the target shape from the points E and A in the top view.
- the intersections of the line perpendicular to the target shape and the end edge of the target shape are points A'and E'. As shown in the top view of FIG.
- the inventor intervenes in the middle of molding an intermediate molded product (preformed part) that facilitates the inflow of the material from the part where the shrinkage flange deforms to the part where the extension flange deformation occurs.
- an intermediate molded product preformed part
- we devised a press forming die that can realize such a press forming method.
- the press molding die has the following configuration.
- a convex side portion 11a protruding outward in the in-plane direction and a concave side portion 11b recessed inward in the in-plane direction are connected side portions 11c.
- a press-molded product 1 having a top plate portion 3 having a continuous uneven side portion 11 and a continuous flange portion 5 formed on the uneven side portion 11 in the top plate portion 3 is molded.
- the upper die 15 and the lower die 17 for bending and molding the flange portion 5 along the uneven side portion 11 FIGS. 1 to 4
- the upper and lower molds of the upper mold and the lower mold show a relative relationship, not necessarily an upper or lower mold, but only a paired relationship.
- the blank 19 (FIG. 6) is placed on the lower die 17, sandwiched between the upper pads 23, and the upper die 15 and the lower pad 21 are moved to move the blank 19.
- the flange portion 5 is bent and molded on the outer edge of the.
- the bending edge portion of the upper die 15 and the lower die 17 is formed with an uneven surface that is uneven in the in-plane direction of the blank 19 to be placed in the same manner as the uneven side portion 11 of the top plate portion 3. ..
- the upper mold 15 has a convex flange forming portion 15a for forming the flange portion 5 on the convex side portion 11a, a concave flange forming portion 15b for forming the flange portion 5 on the concave side portion 11b, and a flange portion on the connecting side portion 11c. It has a connecting side flange forming portion 15c for forming No. 5 (see FIG. 4). Then, the convex side flange forming portion 15a protrudes from the concave side flange forming portion 15b in the press forming direction (downward in FIGS. 1 to 4 in the out-of-plane direction of the blank 19 to be placed), and the connecting side flange forming portion is formed. The portion 15c is inclined from the convex flange molding portion 15a toward the concave flange molding portion 15b (see FIGS. 2 and 4).
- the lower pad 21 has a shape corresponding to the convex side flange forming portion 15a, the concave side flange forming portion 15b, and the connecting side flange forming portion 15c formed on the upper die 15, respectively. That is, the portion of the lower pad 21 corresponding to the convex side flange molding portion 15a of the upper mold 15 (lower pad convex side flange molding portion 21a) is the portion corresponding to the concave side flange molding portion 15b of the upper mold 15 (lower pad concave). It is recessed in the press forming direction from the side flange forming portion 21b).
- portion corresponding to the connecting side flange forming portion 15c of the upper die 15 (lower pad connecting side flange forming portion 21c) is inclined from the lower pad concave side flange forming portion 21b toward the lower pad convex side flange forming portion 21a. (See FIGS. 1 and 3).
- the press molding method of the present embodiment includes a molding start pre-molding step S1, an initial molding step S3, and a late molding step S5 in which the blank 19 is set in the press molding die 13.
- a molding start pre-molding step S1 an initial molding step S3
- a late molding step S5 in which the blank 19 is set in the press molding die 13.
- each step will be described in detail with reference to FIGS. 5 to 13.
- FIGS. 7, 8, and 11 for explaining the movement of the mold the upper mold 15 and the upper pad 23 are perspective views in order to show the molding state of the blank 19.
- a blank 19 made of a metal sheet is placed on the lower mold 17, and as shown in FIG. 7, a part of the blank 19 is partially padded on the upper pad. Sandwich with 23.
- the uppermost surface of the lower pad 21 (for example, the concave side flange molding portion 21b of the lower pad) is flush with the upper surface of the lower mold 17.
- the portion corresponding to the top plate portion 3 in the blank 19 is arranged on the lower mold 17, and the portion corresponding to the flange portion 5 in the blank 19 is arranged on the lower pad concave edge flange forming portion 21b in the lower pad 21.
- the flange portion 5 is formed on the convex side portion 11a of the top plate portion 3, but the concave side portion 11b is supported by the lower pad concave side flange forming portion 21b, so that the flange portion 5 is formed. Not molded. Therefore, not the flange portion 5 but the twisted shape portion 25 is formed on the connecting side portion 11c extending from the convex side portion 11a to the concave side portion 11b. As shown in FIG. 9, the twisted shape portion 25 has a twisted shape because one end side is connected to the flange portion 5 formed on the convex side portion 11a and the other end side is connected to the flat top plate portion 3. It has become.
- FIG. 10 is a diagram illustrating a material flow in the molding process of the CC portion surrounded by the broken line in FIG. 9, and shows a state in which FIG. 9 is viewed from above and from the side.
- the fine broken line is the edge of the blank before molding
- the coarse broken line is the edge of the twisted shape portion 25
- the solid line is the edge of the target shape.
- Points A to E and points A'to E'in the figure are the same points as those shown in FIG. That is, point A in the figure is the R stop of the curved portion in the blank 19, and is the tip position of the twisted portion 25 with almost no deformation.
- Point B corresponds to one R stop of the blank portion that causes conventional shrinkage flange deformation, and point B'is a line and twist that are perpendicular to the end edge of the torsion shape portion 25 from point B in the top view. It is an intersection with the end edge of the shape portion 25.
- the point D is the R stop of the curved portion in the blank 19, and the point D'is the intersection of the line perpendicular to the end edge of the target shape and the end edge of the target shape in the top view.
- the distance from point B'to point D' is shorter than the distance from point B to point D (B'D' ⁇ BD), so the flange formed on the convex side portion 11a by the material remainder. Wrinkles are about to occur in part 5.
- the distance from point A to point B' is longer than the distance from point A to point B (AB'> AB) when viewed three-dimensionally, so the material is pulled toward point A and "ridgeline". It flows off from "almost perpendicular to”. Therefore, the material flow shown by the arrow in FIG. 10 closer to point A is generated as compared with the material flow indicated by the arrow in the wrinkle generation region in FIG. 15, and this material flow causes the shrinkage flange deformation formed in the initial molding step. The excess material is alleviated and the occurrence of wrinkles is suppressed.
- the upper die 15 and the lower pad 21 are moved in the press forming direction.
- the twisted shape portion 25 is formed into the flange portion 5 by the connecting side flange forming portion 15c
- the flange portion 5 is formed into the concave side portion 11b by the concave side flange forming portion 15b, and the target shape is formed.
- the molding process of the late molding step S5 as shown by the thick arrow in FIG. 12, the material flows in from the torsional shape portion 25 to the stretched flange deformed portion, so that the material shortage of the stretched flange deformed portion is alleviated and cracks occur. Is suppressed.
- FIG. 13 is a diagram illustrating a material flow in the molding process of the DD portion surrounded by the broken line in FIG. 12, and shows a state in which FIG. 12 is viewed from above and from the side. Further, in FIG. 13, the fine broken line is the end edge of the blank before molding, the coarse broken line is the end edge of the twisted shape portion 25, and the solid line is the end edge of the flange portion 5 in the target shape.
- points A to E and points A'to E'in the figure are the same points as those shown in FIGS. 15 and 10. That is, the point A'in the figure is the intersection of the line perpendicular to the ridgeline of the target shape and the target shape in the top view from the point A.
- the point E corresponds to one of the R stops of the blank portion where the conventional stretch flange deformation occurs, and the point E'is the line perpendicular to the end edge of the target shape from the point E in the top view and the target shape. It is the intersection with the edge.
- the distance from point A'to point E' is longer than the distance from point A to point E (A'E'> AE), and the flange portion formed on the concave side portion 11b due to lack of material. At 5, cracks are about to occur.
- the distance from the D'point to the E'point is shorter than the distance from the D'point to the E point (D'E' ⁇ D'E), so the material is on the A'side. It is pushed by and flows away from "almost perpendicular to the ridgeline". Therefore, the material flow indicated by the arrow in FIG.
- the flange portion 5 is formed on the convex side portion 11a by the convex side flange forming portion 15a at the initial stage of molding, and the connecting side flange forming portion 15c is used to form the flange portion 5.
- a twisted shape portion 25 having a shape continuously twisted toward the concave side portion 11b is formed on the flange portion 5, and in the latter stage of molding, the twisted shape portion 25 is formed into the flange portion 5 by the connecting side flange forming portion 15c.
- the flange portion 5 can be formed on the concave side portion 11b by the concave side flange forming portion 15b to form a target shape.
- the torsional shape portion 25 that promotes the material flow to the portion where the stretch flange is deformed is formed by first molding only the portion where the shrinkage flange is deformed.
- the target shape can be formed by suppressing the material shortage due to the stretch flange deformation due to the material flow from the torsional shape portion 25.
- step S3 by dispersing the strain in the dangerous portion where the stretch flange crack occurs and the dangerous portion where the shrink flange wrinkle occurs, in the initial molding step S3, the occurrence of wrinkles due to the shrink flange deformation is suppressed, and the late molding is performed.
- step S5 the occurrence of cracks due to the deformation of the stretched flange is suppressed, and the occurrence of wrinkles and cracks can be suppressed throughout the entire process.
- the mold can be press-molded by one action, which is a movement in the same direction, and can be efficiently press-molded.
- press molding was performed with an example of a sliding door rail member as shown in FIG. 14 as a target shape.
- the material used was a steel plate with a tensile strength of 1180 MPa class and a plate thickness of 1.4 mm.
- a target shape was formed in one step without forming the torsional shape portion 25, and press molding was performed by pad foam forming (pad forming) in which the top plate portion was pressed by a pressure pad.
- initial molding is performed by using the press forming die 13 described in the embodiment to form the flange portion 5 on the convex side portion 11a and the twisted shape portion 25 on the connecting side portion 11c.
- the process S3 includes a late forming step S5 in which the twisted shape portion 25 is formed into the flange portion 5 and the flange portion 5 is formed into the concave side portion 11b.
- the press molding was performed.
- the part a shown in FIG. 14 was wrinkled, and the part b was cracked, so that the desired shape could not be obtained.
- neither cracking nor wrinkling of the flange portion 5 occurred, and a high-quality press-molded product could be obtained. From the above, it was shown that the present invention is effective for suppressing stretch flange cracking and shrinking flange wrinkles when molding a press-molded part having irregularities in the top plate portion 3 in the in-plane direction.
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Abstract
Description
成形開始前工程S1では、図6に示すように、金属板(metal sheet)からなるブランク19を下型17上に載置して、図7に示すように、ブランク19の一部を上パッド23で挟む。このとき、下パッド21の最上面(例えば、下パッド凹辺フランジ成形部21b)は、下型17の上面と面一になっている。そして、ブランク19における天板部3に相当する部位が下型17上に配置され、ブランク19におけるフランジ部5に対応する部位が下パッド21における下パッド凹辺フランジ成形部21b上に配置されている。
初期成形工程S3では、図8に示すように、上パッド23及び下型17によってブランク19の一部を挟持した状態で、下パッド21でブランク19の一部を支持して、上型15をプレス成形方向に相対的に移動する。これによって、凸辺フランジ成形部15aによって凸辺部11aにフランジ部5が成形されると共に、連結辺フランジ成形部15cによって凹辺部11bに向かってねじれた形状のねじり形状部25がフランジ部5に連続して成形される。
後期成形工程S5では、図11に示すように、上型15及び下パッド21をプレス成形方向に移動する。これにより、連結辺フランジ成形部15cによってねじり形状部25がフランジ部5に成形されると共に、凹辺フランジ成形部15bによって凹辺部11bにフランジ部5が成形され、目標形状が成形される。後期成形工程S5の成形過程では、図12の太い矢印で示すように、ねじり形状部25から伸びフランジ変形部へと材料流入が生じるため、伸びフランジ変形部の材料不足が緩和され、割れの発生が抑制される。
3 天板部
5 フランジ部
7 凸部
9 凹部
11 凹凸辺部
11a 凸辺部
11b 凹辺部
11c 連結辺部
13 プレス成形金型
15 上型
15a 凸辺フランジ成形部
15b 凹辺フランジ成形部
15c 連結辺フランジ成形部
17 下型
19 ブランク
21 下パッド
21a 下パッド凸辺フランジ成形部
21b 下パッド凹辺フランジ成形部
21c 下パッド連結辺フランジ成形部
23 上パッド
25 ねじり形状部
Claims (2)
- 面内方向で外側に突出する凸辺部と面内方向で内側に凹む凹辺部が連結辺部を介して連続する凹凸辺部を有する天板部と、該天板部における前記凹凸辺部に形成され連続したフランジ部とを有するプレス成形品を成形するプレス成形金型であって、
前記凹凸辺部に沿ってフランジ部を曲げ成形する上型及び下型と、前記上型及び下型と協働してブランクを挟持する下パッド及び上パッドとを備え、
前記上型は、前記凸辺部にフランジ部を成形する凸辺フランジ成形部と、前記凹辺部にフランジ部を成形する凹辺フランジ成形部と、前記連結辺部にフランジ部を成形する連結辺フランジ成形部とを有し、前記凸辺フランジ成形部が前記凹辺フランジ成形部よりもプレス成形方向に突出すると共に、前記連結辺フランジ成形部が前記凸辺フランジ成形部から前記凹辺フランジ成形部に向かって傾斜し、
前記下パッドは、前記上型に形成された前記凸辺フランジ成形部、前記凹辺フランジ成形部及び前記連結辺フランジ成形部にそれぞれ対応した形状を有し、
成形初期に、前記凸辺部に前記凸辺フランジ成形部によってフランジ部を成形すると共に、前記連結辺フランジ成形部によって該フランジ部に連続して前記凹辺部に向かってねじれた形状のねじり形状部を成形し、
成形後期に、前記連結辺フランジ成形部によってねじり形状部をフランジ部に成形すると共に、前記凹辺フランジ成形部によって前記凹辺部にフランジ部を成形して、目標形状に成形できる、プレス成形金型。 - 面内方向で外側に突出する凸辺部と面内方向で内側に凹む凹辺部が連結辺部を介して連続する凹凸辺部を有する天板部と、該天板部における前記凹凸辺部に形成され連続したフランジ部とを有するプレス成形品を、請求項1に記載のプレス成形金型を用いて成形するプレス成形方法であって、
前記上パッド及び下型によってブランクの一部を挟持すると共に、前記下パッドでブランクの一部を支持して、前記上型をプレス成形方向に移動することで、前記凸辺フランジ成形部によって前記凸辺部にフランジ部を成形すると共に、前記連結辺フランジ成形部によって前記凹辺部に向かってねじれた形状のねじり形状部を該フランジ部に連続して成形する初期成形工程と、
前記上型及び前記下パッドをプレス成形方向に移動して、前記連結辺フランジ成形部によってねじり形状部をフランジ部に成形すると共に、前記凹辺フランジ成形部によって前記凹辺部にフランジ部を成形して、目標形状に成形する後期成形工程と、
を含む、プレス成形方法。
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