JP6690605B2 - Press molding method - Google Patents
Press molding method Download PDFInfo
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- JP6690605B2 JP6690605B2 JP2017132445A JP2017132445A JP6690605B2 JP 6690605 B2 JP6690605 B2 JP 6690605B2 JP 2017132445 A JP2017132445 A JP 2017132445A JP 2017132445 A JP2017132445 A JP 2017132445A JP 6690605 B2 JP6690605 B2 JP 6690605B2
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- shape
- trimming
- top plate
- shaped
- wall portion
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- 238000000465 moulding Methods 0.000 title claims description 59
- 238000000034 method Methods 0.000 title claims description 32
- 238000009966 trimming Methods 0.000 claims description 37
- 238000009751 slip forming Methods 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 11
- 230000037303 wrinkles Effects 0.000 description 13
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000007493 shaping process Methods 0.000 description 5
- 238000010097 foam moulding Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
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
- 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
- B21D24/16—Additional equipment in association with the tools, e.g. for shearing, for trimming
-
- 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
- B21D28/00—Shaping by press-cutting; Perforating
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Punching Or Piercing (AREA)
Description
本発明は、プレス成形方法に関し、特に、平面視でＴ字形状を有する自動車用のＴ字形状部品を製造するプレス成形方法に関する。 The present invention relates to a press molding method, and more particularly to a press molding method for manufacturing a T-shaped component for an automobile having a T shape in a plan view.
自動車用部品の中でも、クロスメンバ等のＴ字形状部品について、引張強度で590MPa級以上の高強度鋼板（ハイテン材）を用いてプレス成形する場合、成形過程においてしわや割れが同時に生じて問題であった。
このような自動車用のＴ字形状部品をプレス成形する技術として、例えば、特許文献１には、２つのＴ字の縦辺を対向させて連結した形状を有する高強度鋼板を用いたセンターピラーを冷間プレス成形する方法が開示されている。
Among T-shaped parts such as cross members among automobile parts, when press-forming using high strength steel plate (high tensile strength material) of 590 MPa class or higher in tensile strength, wrinkles and cracks occur at the same time in the forming process, which causes a problem. there were.
As a technique for press-molding such a T-shaped component for an automobile, for example, Patent Document 1 discloses a center pillar using a high-strength steel plate having a shape in which two vertical sides of T-shaped are opposed to each other and connected. A method of cold press forming is disclosed.
しかしながら、特許文献１に開示される方法は、対象とする部品がセンターピラーであって、壁高さが低い（成形深さが浅い）ことによりＴ字の横辺部（Ｔ字付け根の天板部の短尺部分）にしわが生じる場合があった(特許文献１の図９)が、Ｔ字の縦辺部（Ｔ字付け根の天板部の長尺部分）ではしわや割れが生じにくかった。しかし、本願で扱うクロスメンバのような部品では、壁高さが高い（成形深さが深い）ことによりＴ字付け根の縦辺部にしわが生じ、また、Ｔ字付け根の縦壁部とフランジ部の接続部分に割れが生じる問題がある。 However, in the method disclosed in Patent Document 1, the target component is the center pillar, and the wall height is low (the molding depth is shallow). There were cases where wrinkles were generated in the short part of the portion (FIG. 9 of Patent Document 1), but wrinkles and cracks were less likely to occur in the vertical side of the T (long part of the top plate of the T-shaped root). However, in a part such as a cross member handled in the present application, the wall height is high (the forming depth is deep), so that wrinkles are generated in the vertical side portion of the T-shaped root, and the vertical wall portion and the flange portion of the T-shaped root are formed. There is a problem that cracks occur at the connection part of.
本発明は、上記のような課題を解決するためになされたものであり、クロスメンバ等のＴ字形状を有する自動車用のＴ字形状部品を、高強度鋼板を用いてプレス成形するに際し、しわと割れの発生を抑制して製造するプレス成形方法を提供することを目的とする。 The present invention has been made to solve the above problems, and when press-molding a T-shaped part for automobiles having a T-shape such as a cross member using a high-strength steel plate, wrinkles are formed. It is an object of the present invention to provide a press-molding method that suppresses the occurrence of cracks and manufactures.
（１）本発明に係るプレス成形方法は、Ｔ字形状部品をプレス成形するものであって、ブランクを、絞り成形により中間形状部品に成形する第１成形工程と、該中間形状部品をトリミングしてトリミング部品を得るトリミング工程と、該トリミング部品をフォーム成形により目標形状の前記Ｔ字形状部品に成形する第２成形工程とを備え、前記第１成形工程において成形する前記中間形状部品は、縦辺部と横辺部とが接続辺部により接続されたＴ字形状の天板部と、該天板部の縦辺部から連続して形成された壁部と、縦辺部側および反対側に前記天板部の横辺部から連続して形成された壁部と、前記接続辺部に前記天板部から連続して形成された壁部と、これら壁部の下端に連続して形成されたフランジ部を有し、さらに、前記天板部における接続辺部の縦辺部側に形成された凸形状部と、前記接続辺部に連続して形成された壁部と該壁部の下端のフランジ部とを接続する底Ｒ部を上方に持ち上げた湾曲Ｒ部を有して、前記トリミング工程は、前記第２成形工程において前記目標形状のＴ字形状部品となるように前記中間形状部品から、不要な部分である前記フランジ部の一部と前記天板部の横辺部から連続して形成され縦辺部方向の反対側のみに形成された壁部と該壁部の下端のフランジ部とをトリミングし、前記第２成形工程は、前記凸形状部及び前記湾曲Ｒ部を押し潰して前記接続辺部に連続する壁部に材料を流入させて目標形状に成形することを特徴とするものである。 (1) The press-molding method according to the present invention is a method for press-molding a T-shaped component, wherein a blank is molded into an intermediate-shaped component by a first molding step, and the intermediate-shaped component is trimmed. A trimming step for obtaining a trimming part by means of foam molding, and a second molding step for forming the trimming part into the T-shaped part having a target shape by form molding. A T-shaped top plate part in which a side part and a horizontal side part are connected by a connecting side part, a wall part continuously formed from a vertical side part of the top plate part, a vertical side part side and an opposite side A wall portion continuously formed from a lateral side portion of the top plate portion, a wall portion continuously formed from the top plate portion on the connection side portion, and a wall portion continuously formed at lower ends of the wall portions. Has a flange part formed on the top plate. The convex R formed on the vertical side of the connection side, the bottom R section connecting the wall formed continuously to the connection side and the flange at the lower end of the wall are raised upward. And a curved R portion, the trimming step includes a part of the flange portion, which is an unnecessary portion, from the intermediate shape component so as to be a T-shaped component having the target shape in the second molding process. The wall portion formed continuously from the lateral side portion of the top plate portion and formed only on the opposite side in the vertical side portion direction and the flange portion at the lower end of the wall portion are trimmed, and the second molding step is performed as described above. It is characterized in that the convex shape portion and the curved R portion are crushed and a material is flown into a wall portion continuous with the connection side portion to form a target shape.
（２）上記（１）に記載のものにおいて、前記凸形状部は、前記縦辺部の長手方向に対して直交する断面形状が、前記接続辺部の縦辺部側から連続して形成された壁部と接続する稜線部を介して、該壁部から連続して凸に湾曲する形状であることを特徴とするものである。 (2) In the structure described in (1) above, the convex shape portion is formed such that a cross-sectional shape orthogonal to the longitudinal direction of the vertical side portion is continuous from the vertical side portion side of the connection side portion. It is characterized in that it has a shape which is convexly curved continuously from the wall portion via a ridge line portion connected to the wall portion.
本発明においては、ブランクを、絞り成形により中間形状部品に成形する第１成形工程と、該中間形状部品をトリミングしてトリミング部品を得るトリミング工程と、該トリミング部品をフォーム成形により目標形状の前記Ｔ字形状部品に成形する第２成形工程とを備え、前記第１成形工程において成形する前記中間形状部品は、縦辺部と横辺部とが接続辺部により接続されたＴ字形状の天板部と、該天板部の縦辺部から連続して形成された壁部と、前記縦辺部側および反対側に前記天板部の横辺部から連続して形成された壁部と、前記接続辺部に前記天板部から連続して形成された壁部と、これら壁部の下端に連続して形成されたフランジ部と、前記天板部における接続辺部の縦辺部側に形成された凸形状部と、前記接続辺部に連続して形成された壁部と該壁部の下端のフランジ部とを接続する底Ｒ部を上方に持ち上げた湾曲Ｒ部を有して、前記トリミング工程は、前記第２成形工程において前記目標形状のＴ字形状部品となるように前記中間形状部品から、不要な部分である前記フランジ部の一部と前記天板部の横辺部から連続して形成され縦辺部方向の反対側のみに形成された壁部と該壁部の下端のフランジ部とをトリミングし、前記第２成形工程は、前記凸形状部及び前記湾曲Ｒ部を押し潰して前記接続辺部に生じるしわの発生を抑制するとともに、該接続辺部に形成した凸形状部から前記壁部に材料を流入させて該壁部から前記フランジ部にかけて発生する割れを防止して目標形状となる前記Ｔ字形状部品に成形することができる。 In the present invention, a first forming step of forming a blank into an intermediate shape part by drawing forming, a trimming step of trimming the intermediate shape part to obtain a trimming part, and a step of forming the trimming part into a target shape by form forming. A second molding step of molding into a T-shaped component, wherein the intermediate-shaped component molded in the first molding step has a T-shaped ceiling in which vertical side portions and horizontal side portions are connected by connecting side portions. A plate portion, a wall portion continuously formed from a vertical side portion of the top plate portion, and a wall portion continuously formed from the horizontal side portion of the top plate portion on the vertical side portion side and the opposite side. A wall portion formed continuously from the top plate portion at the connection side portion, a flange portion continuously formed at lower ends of the wall portions, and a vertical side portion side of the connection side portion at the top plate portion. And the convex part formed on the The trimming step has a curved R section in which the bottom R section connecting the formed wall section and the flange section at the lower end of the wall section is lifted upward, and the trimming step has a T shape of the target shape in the second molding step. From the intermediate shaped part to be a shaped part, it is formed continuously from a part of the flange part which is an unnecessary part and the lateral side part of the top plate part, and is formed only on the opposite side in the vertical side part direction. Trimming the wall portion and the flange portion at the lower end of the wall portion, and the second molding step suppresses the generation of wrinkles generated in the connection side portion by crushing the convex shaped portion and the curved R portion, It is possible to form a T-shaped part having a target shape by preventing a crack from occurring from the wall portion to the flange portion by causing a material to flow into the wall portion from the convex portion formed on the connection side portion. .
本発明の実施の形態に係るプレス成形方法は、図１（ｃ）に示すようなＴ字形状部品１を目標形状とするものであり、ブランクを、絞り成形により図１（ａ）に示すような中間形状部品２１を成形する第１成形工程と、中間形状部品２１をトリミングして図１（ｂ）に示すようなトリミング部品４１を成形するトリミング工程と、フォーム成形によりトリミング部品４１を図１（ｃ）に示すような目標形状のＴ字形状部品１を成形する第２成形工程と、を備えている。以下、まずは成形対象とするＴ字形状部品１について説明した後、本実施の形態に係るプレス成形方法を説明する。
なお、以下の説明において、同一の機能を有する部位については同一の符号を付し、説明が重複するのを避けている。
The press molding method according to the embodiment of the present invention uses a T-shaped component 1 as shown in FIG. 1 (c) as a target shape, and a blank is drawn by drawing as shown in FIG. 1 (a). 1 is a step of molding the intermediate shaped part 21 and a trimming step of trimming the intermediate shaped part 21 to form a trimming part 41 as shown in FIG. 1B. A second molding step of molding the T-shaped component 1 having a target shape as shown in (c). Hereinafter, first, the T-shaped component 1 to be molded will be described, and then the press molding method according to the present embodiment will be described.
In the following description, parts having the same function are designated by the same reference numeral to avoid redundant description.
＜Ｔ字形状部品＞
Ｔ字形状部品１は、図１（ｃ）に示すように、Ｔ字形状の天板部３と、天板部３から連続する壁部５と、壁部５から連続するフランジ部７とを有するものであり、天板部３は、縦辺部９と横辺部１１とを有し、縦辺部９と横辺部１１は、接続辺部１３を介して接続される。
ここで、接続辺部１３は、図１（ｃ）に示すように、両側辺が湾曲する形状の部位である。
<T-shaped parts>
As shown in FIG. 1C, the T-shaped component 1 includes a T-shaped top plate part 3, a wall part 5 continuous from the top plate part 3, and a flange part 7 continuous from the wall part 5. The top plate portion 3 has a vertical side portion 9 and a horizontal side portion 11, and the vertical side portion 9 and the horizontal side portion 11 are connected via a connection side portion 13.
Here, the connecting side portion 13 is a portion having a shape in which both sides are curved, as shown in FIG.
壁部５は、天板部３の縦辺部９から接続辺部１３を経て横辺部１１に稜線部１７を介して連続して形成される。
そして、フランジ部７は、壁部５の下端から底Ｒ部１９を介して連続して形成される。
The wall portion 5 is continuously formed from the vertical side portion 9 of the top plate portion 3 to the horizontal side portion 11 via the connecting side portion 13 and the ridge line portion 17.
The flange portion 7 is continuously formed from the lower end of the wall portion 5 via the bottom R portion 19.
＜しわ、割れを同時に抑制可能な理由＞
クロスメンバのように成形深さが深いＴ字形状部品１を引張強度が590MPa級以上の高強度鋼板を用いて１工程で絞り成形すると、図２に示すように、天板部３における接続辺部１３にしわが発生し、また、接続辺部１３に稜線部１７ｂを介して連続する壁部５ｂからフランジ部７ｂにかけて割れが発生する場合があり、成形不具合を少なくしてプレス成形することが困難であった。
<Reasons for simultaneously suppressing wrinkles and cracks>
When a T-shaped part 1 having a deep forming depth such as a cross member is drawn in one step using a high-strength steel plate having a tensile strength of 590 MPa or more, as shown in FIG. Wrinkles may occur in the portion 13, and cracks may occur from the wall portion 5b continuous to the connection side portion 13 via the ridge line portion 17b to the flange portion 7b, and it is difficult to perform press molding with less molding defects. Met.
本発明は以下の理由により、しわと割れの双方を同時に抑制してＴ字形状部品をプレス成形できる。 The present invention can press-form a T-shaped component while simultaneously suppressing both wrinkles and cracks for the following reasons.
第１成形工程においては、中間形状部品２１の接続辺部１３に積極的に材料余りとするように凸形状部１５（図１（ａ））を形成することにより、成形過程における余肉を逃がすことができ、Ｔ字形状の接続辺部１３におけるしわの発生が防止される。 In the first molding step, the convex shape portion 15 (FIG. 1A) is positively formed on the connection side portion 13 of the intermediate shape component 21 so as to leave a material excess, so that the excess thickness in the molding process is released. Therefore, it is possible to prevent wrinkles from occurring in the T-shaped connecting side portion 13.
続くトリミング工程においては、第２成形工程において前記目標形状となるように中間形状部品２１から不要な部分をトリミングする（図１（ｂ））ことにより、第２成形工程において中間形状部品２１に付与された凸形状部１５から壁部５ａへと材料が流入しやすくなる。 In the subsequent trimming step, unnecessary portions are trimmed from the intermediate shape part 21 so as to have the target shape in the second forming step (FIG. 1 (b)), so that the intermediate shape part 21 is provided in the second forming step. The material easily flows into the wall portion 5a from the raised convex portion 15.
そして、第２成形工程においては、凸形状部１５を押し潰すように成形することで、凸形状部１５から壁部５ａへ材料が流入され、Ｔ字形状部品１の壁部５ｂからフランジ部７ｂにかけて割れの発生が防止される（図１（ｃ））。 Then, in the second molding step, the convex shaped portion 15 is molded so as to be crushed, so that the material is flowed into the wall portion 5a from the convex shaped portion 15 and the wall portion 5b of the T-shaped component 1 to the flange portion 7b. The generation of cracks is prevented over time (FIG. 1 (c)).
さらに、本実施の形態に係るプレス成形方法は、第１成形工程において壁部５ａとフランジ部７ａとを接続する底Ｒ部１９ａのダイＲを、目標形状の底Ｒ部１９ｂ（図１（ｃ））のダイＲよりも拡大する（ぼかす）ように成形する（図１（ｂ））ので、該拡大された底Ｒ部１９ａから第２成形工程において材料を流入させることができ、割れの発生をさらに防止することができる。 Further, in the press molding method according to the present embodiment, the die R of the bottom R portion 19a connecting the wall portion 5a and the flange portion 7a in the first molding step is changed to the bottom R portion 19b of the target shape (see FIG. )) The die R is formed so as to be larger (blur) than the die R (FIG. 1 (b)), so that the material can be introduced from the enlarged bottom R portion 19a in the second forming step, and cracks are generated. Can be further prevented.
＜プレス成形方法＞
次に、本実施の形態に係るプレス成形方法の上記の各工程について説明する。
≪第１成形工程≫
第１成形工程は、ブランクを、絞り成形によりＴ字形状の天板部３と、天板部３から連続して形成された壁部５と、壁部５の下端に連続して形成されたフランジ部７と、天板部３の接続辺部１３の縦辺部９側に形成された凸形状部１５とを有する中間形状部品２１（図１（ａ））に成形するものであり、例えば、図４に示すパンチ３３とダイ３５とブランクホルダ３７とを備えた金型３９を用いて、図３に示すブランク３１をパンチ３３との位置関係として絞り成形する。
<Press molding method>
Next, each of the above steps of the press molding method according to the present embodiment will be described.
≪First molding process≫
In the first forming step, the blank was formed by drawing a T-shaped top plate portion 3, a wall portion 5 continuously formed from the top plate portion 3, and a lower end of the wall portion 5 continuously. It is molded into an intermediate shape component 21 (FIG. 1 (a)) having a flange portion 7 and a convex shape portion 15 formed on the vertical side portion 9 side of the connection side portion 13 of the top plate portion 3. The blank 31 shown in FIG. 3 is formed by drawing in a positional relationship with the punch 33 using a die 39 having the punch 33, the die 35, and the blank holder 37 shown in FIG.
壁部５は、図１（ａ）に示すように、天板部３の縦辺部９から連続して形成された壁部５ｃと、縦辺部９側に天板部３の横辺部１１から連続して形成された壁部５ｄと、天板部３の接続辺部１３から連続して形成された壁部５ａと、縦辺部９と反対側に横辺部１１から連続して形成された壁部５ｅとからなる。 As shown in FIG. 1A, the wall portion 5 has a wall portion 5 c formed continuously from the vertical side portion 9 of the top plate portion 3, and a horizontal side portion of the top plate portion 3 on the vertical side portion 9 side. A wall portion 5d continuously formed from the side wall portion 11; a wall portion 5a continuously formed from the connecting side portion 13 of the top plate portion 3; It is composed of the formed wall portion 5e.
また、接続辺部１３の縦辺部９側とは、接続辺部１３のうち縦辺部９に近い部位である。
そして、凸形状部１５は、接続辺部１３の縦辺部９側に形成された上方に凸に湾曲する形状であり、図５に示すように、接続辺部１３に相当する部位に上方に凸に湾曲する形状の凸形状形成部３３ａが設けられたパンチ３３を用いて形成される。
The vertical side 9 side of the connection side 13 is a part of the connection side 13 near the vertical side 9.
The convex portion 15 has a shape that is convexly curved upward formed on the vertical side portion 9 side of the connection side portion 13, and as shown in FIG. It is formed by using a punch 33 provided with a convex shape forming portion 33a having a convex curved shape.
ここで、凸形状部１５は、縦辺部９の長手方向に対して直交する断面形状が、接続辺部１３の縦辺部９側から連続して形成された壁部５ａと接続する稜線部１７ａを介して、壁部５ａから連続して凸に湾曲する形状であっても良い。 Here, the convex portion 15 has a ridge portion whose cross-sectional shape orthogonal to the longitudinal direction of the vertical side portion 9 connects with the wall portion 5a formed continuously from the vertical side portion 9 side of the connection side portion 13. The shape may be such that it continuously curves from the wall portion 5a via 17a so as to be convex.
さらに、凸形状部１５から連続する壁部５ａとフランジ部７ａとが接続する底Ｒ部１９ａには、第２成形工程でトリミング部品４１がパンチ５１（図６参照）に干渉して浮き上がって金型からずれないようにするために、湾曲Ｒ部１９ｃを形成する（図１（ｂ））。
ここで、湾曲Ｒ部１９ｃは、例えば、底Ｒ部１９ａのダイＲを、目標形状の底Ｒ部１９ｂのダイＲよりも大きく設定することにより、底Ｒ部１９ｂよりも上方向に持ち上げるように形成することができる。
Further, the trimming component 41 interferes with the punch 51 (see FIG. 6) in the second molding step and floats up on the bottom R portion 19a where the wall portion 5a continuous from the convex portion 15 and the flange portion 7a are connected to each other. A curved R portion 19c is formed so as not to be displaced from the mold (FIG. 1B).
Here, the curved R portion 19c is set to be lifted above the bottom R portion 19b by setting the die R of the bottom R portion 19a larger than the die R of the bottom R portion 19b of the target shape, for example. Can be formed.
なお、図１（ａ）に示す中間形状部品２１は、天板部３の横辺部１１における縦辺部９と反対側に連続するベローズ状の壁部５ｅおよび壁部５ｅら連続するフランジ部７ｄがさらに形成されているが、横辺部１１の左右の端部１１ａは壁部が連続して形成されていない。 The intermediate-shaped component 21 shown in FIG. 1A has a bellows-shaped wall portion 5e continuous to the side opposite to the vertical side portion 9 of the horizontal side portion 11 of the top plate portion 3 and a flange portion continuous from the wall portion 5e. 7d is further formed, but the wall portions are not continuously formed at the left and right ends 11a of the lateral side portion 11.
これは、第１成形工程において中間形状部品２１に絞り成形する際に、ブランク３１におけるフランジ部７ｄに相当する部位をダイ３５とブランクホルダ３７で挟持する（図４）ことにより横辺部１１におけるしわの発生を抑制することと、横辺部１１の端部１１ａ付近に割れが発生するのを防止するためである。 This is because the side corresponding to the flange portion 7d of the blank 31 is sandwiched by the die 35 and the blank holder 37 in the first forming process in the first forming process by the die 35 and the blank holder 37 (FIG. 4). This is to suppress the generation of wrinkles and to prevent the occurrence of cracks near the end 11a of the lateral side portion 11.
なお、壁部５ｅとフランジ部７ｄとが形成され、端部１１ａから連続する壁部が形成されないように、鋼板を切り出してブランク３１（図３参照）の形状が設定されている。 In addition, the shape of the blank 31 (see FIG. 3) is set by cutting the steel plate so that the wall portion 5e and the flange portion 7d are formed and the continuous wall portion is not formed from the end portion 11a.
≪トリミング工程≫
トリミング工程は、中間形状部品２１をトリミングしてトリミング部品４１（図１（ｂ））を得る工程であり、第２成形工程において前記目標形状となるように中間形状部品２１から不要な部分をトリミングする。
トリミング部品４１は、第２成形工程において成形されたＴ字形状部品１がさらなるトリミングを要せずに目標形状となるように、中間形状部品２１における横辺部１１の左右両側の端部１１ａと、横辺部１１のうち縦辺部９方向の反対側のみに形成された壁部５ｅおよびフランジ部７ｄが連続する側の部位と、フランジ部７の平面視で左右両側の側端部７ｃをトリミングしたものである。
≪Trimming process≫
The trimming step is a step of trimming the intermediate shape part 21 to obtain the trimming part 41 (FIG. 1B), and trimming unnecessary parts from the intermediate shape part 21 so as to have the target shape in the second molding step. To do.
The trimming component 41 has end portions 11a on both left and right sides of the lateral side portion 11 of the intermediate shaped component 21 so that the T-shaped component 1 molded in the second molding step has a target shape without further trimming. The side portion of the lateral side portion 11 on which the wall portion 5e and the flange portion 7d formed only on the opposite side in the direction of the vertical side portion 9 are continuous, and the side end portions 7c on the left and right sides in plan view of the flange portion 7. It has been trimmed.
もっとも、本発明に係るトリミング工程は、第２成形工程の後、当該部位をトリミングして目標形状にするものであってもよい。 However, in the trimming process according to the present invention, after the second molding process, the part may be trimmed to have a target shape.
≪第２成形工程≫
第２成形工程は、図６に示すようなパンチ５１とダイ５３（５３ａおよび５３ｂ）を備えた金型５５を用いて、トリミング部品４１（図１（ｂ））をフォーム成形により目標形状のＴ字形状部品１（図１（ｃ））に成形する工程であり、トリミング部品４１の凸形状部１５を押し潰して壁部５ａに材料を流入させ、また、湾曲Ｒ部１９ｃを割れを発生させずに成形する。
<< Second molding step >>
In the second molding step, the trimming component 41 (FIG. 1 (b)) is formed into a target shape T by form molding using a die 55 having a punch 51 and a die 53 (53a and 53b) as shown in FIG. This is a step of molding into the letter-shaped component 1 (FIG. 1 (c)), in which the convex portion 15 of the trimming component 41 is crushed to allow the material to flow into the wall portion 5a, and the curved R portion 19c is cracked. Mold without.
第２成形工程において凸形状部１５から壁部５ａに材料を流入させやすくするためには、例えば、トリミング部品４１における天板部３の凸形状部１５はパッドで押さえず、残りの部位（縦辺部９および横辺部１１）をパッドで押さえながら、パンチ５１とダイ５３でフォーム成形すればよい。 In order to make it easier for the material to flow from the convex portion 15 into the wall portion 5a in the second molding step, for example, the convex portion 15 of the top plate portion 3 of the trimming component 41 is not pressed by the pad and the remaining portion (vertical portion) is formed. Forming may be performed with the punch 51 and the die 53 while pressing the side portion 9 and the lateral side portion 11) with the pad.
以上、本実施の形態に係るプレス成形方法によれば、引張強度が590MPa級以上の高強度鋼板を用いても、しわの抑制と割れの回避を同時に達成して成形深さの深いＴ字形状部品をプレス成形することができる。 As described above, according to the press-forming method according to the present embodiment, even if a high-strength steel sheet having a tensile strength of 590 MPa class or higher is used, it is possible to simultaneously achieve the suppression of wrinkles and the avoidance of cracks and the deep T-shaped shape with deep forming depth. The part can be press molded.
なお、上記の説明において、中間形状部品２１の凸形状部１５は、接続辺部１３における稜線部１７ａを介して壁部５ａから連続して凸に湾曲するように形成されたものであったが、第２成形工程におけるトリミング部品４１のフォーム成形において凸形状部１５から壁部５ａへと材料を流入させることができるものであれば、凸形状部１５の形状はこれに限定されるものではなく、接続辺部１３において稜線部１７ａよりも内側に形成されて上方に凸形状のものであってもよい。 In the above description, the convex shape portion 15 of the intermediate shape component 21 is formed so as to be continuously curved from the wall portion 5a via the ridge line portion 17a of the connection side portion 13 to be convex. The shape of the convex shape portion 15 is not limited to this as long as the material can flow from the convex shape portion 15 to the wall portion 5a in the foam molding of the trimming component 41 in the second molding step. Alternatively, the connecting side portion 13 may be formed inside the ridge line portion 17a and have a convex shape upward.
さらに、上記の説明において、Ｔ字形状部品１は、図１（ｃ）に示すように長手方向の両端部において２つのＴ字の縦辺を対向させて連結した形状であるが、本願発明は、長手方向の一方の端部にＴ字形状を有するＴ字形状部品をプレス成形するものであってもよい。 Further, in the above description, the T-shaped component 1 has a shape in which two vertical sides of the T-shape are opposed to each other and connected at both ends in the longitudinal direction as shown in FIG. 1C. Alternatively, a T-shaped component having a T-shape at one end in the longitudinal direction may be press-molded.
１ Ｔ字形状部品
３ 天板部
５、５ａ、５ｂ、５ｃ、５ｄ、５ｅ 壁部
７、７ａ、７ｂ、７ｄ フランジ部
７ｃ 側端部
９ 縦辺部
１１ 横辺部
１１ａ 端部
１３ 接続辺部
１５ 凸形状部
１７、１７ａ、１７ｂ 稜線部
１９、１９ａ、１９ｂ 底Ｒ部
１９ｃ 湾曲Ｒ部
２１ 中間形状部品
３１ ブランク
３３ パンチ
３３ａ 凸形状形成部
３５ ダイ
３７ ブランクホルダ
３９ 金型
４１ トリミング部品
５１ パンチ
５３、５３ａ、５３ｂ ダイ
５５ 金型
1 T-shaped part 3 Top plate part 5, 5a, 5b, 5c, 5d, 5e Wall part 7, 7a, 7b, 7d Flange part 7c Side end part 9 Vertical side part 11 Horizontal side part 11a End part 13 Connection side part 15 Convex Shaped Part 17, 17a, 17b Ridge Line Part 19, 19a, 19b Bottom R Part 19c Curved R Part 21 Intermediate Shaped Part 31 Blank 33 Punch 33a Convex Shaped Part 35 Die 37 Blank Holder 39 Mold 41 Trimming Part 51 Punch 53 , 53a, 53b Die 55 Mold
Claims (1)
ブランクを、絞り成形により中間形状部品に成形する第１成形工程と、該中間形状部品をトリミングしてトリミング部品を得るトリミング工程と、該トリミング部品をフォーム成形により目標形状の前記Ｔ字形状部品に成形する第２成形工程とを備え、
前記第１成形工程において成形する前記中間形状部品は、縦辺部と横辺部とが接続辺部により接続されたＴ字形状の天板部と、該天板部の縦辺部から連続して形成された壁部と、縦辺部側および反対側に前記天板部の横辺部から連続して形成された壁部と、前記接続辺部に前記天板部から連続して形成された壁部と、これら壁部の下端に連続して形成されたフランジ部を有し、
さらに、前記天板部における接続辺部の縦辺部側に形成され、前記縦辺部の長手方向に対して直交する断面形状が、前記接続辺部の縦辺部側から連続して形成された壁部と接続する稜線部を介して、該壁部から連続して凸に湾曲する凸形状部と、前記接続辺部に連続して形成された壁部と該壁部の下端のフランジ部とを接続する底Ｒ部を上方に持ち上げた湾曲Ｒ部と、を有して、
前記トリミング工程は、前記第２成形工程において前記目標形状のＴ字形状部品となるように前記中間形状部品から、不要な部分である前記フランジ部の一部と前記天板部の横辺部から連続して形成され縦辺部方向の反対側のみに形成された壁部と該壁部の下端のフランジ部とをトリミングし、
前記第２成形工程は、前記凸形状部及び前記湾曲Ｒ部を押し潰して前記接続辺部に連続する壁部に材料を流入させて目標形状に成形することを特徴とするプレス成形方法。 A method for press-forming a T-shaped part,
A first forming step of forming a blank into an intermediate shape part by drawing, a trimming step of trimming the intermediate shape part to obtain a trimming part, and forming the trimming part into the T-shaped part having a target shape by form forming. A second molding step for molding,
The intermediate-shaped component molded in the first molding step has a T-shaped top plate portion in which a vertical side portion and a horizontal side portion are connected by a connecting side portion, and a continuous side from the vertical side portion of the top plate portion. Formed on the vertical side and on the opposite side from the lateral side of the top plate, and on the connecting side formed from the top plate. And a flange portion continuously formed at the lower ends of these wall portions,
Further, a cross-sectional shape that is formed on the vertical side of the connection side of the top plate and that is orthogonal to the longitudinal direction of the vertical side is formed continuously from the side of the vertical side of the connection side. Through the ridge line portion that is connected to the wall portion, a convex portion that is continuously convexly curved from the wall portion, a wall portion that is continuously formed on the connection side portion, and a flange portion at the lower end of the wall portion. And a curved R portion in which a bottom R portion that connects the
In the trimming step, from the intermediate shape part so as to be a T-shaped part having the target shape in the second forming step, from a part of the flange part and a lateral side part of the top plate part which are unnecessary parts. Trimming the wall portion formed continuously only on the opposite side in the vertical side direction and the flange portion at the lower end of the wall portion,
In the second molding step, the convex shape portion and the curved R portion are crushed, and a material is caused to flow into a wall portion continuous with the connection side portion to form a target shape.
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| PCT/JP2018/016818 WO2019008880A1 (en) | 2017-07-06 | 2018-04-25 | Press forming method |
| CN201880041949.2A CN110799278B (en) | 2017-07-06 | 2018-04-25 | Press molding method |
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