JP4518699B2

JP4518699B2 - Press molding equipment for double-layer products

Info

Publication number: JP4518699B2
Application number: JP2001134148A
Authority: JP
Inventors: 功明岩浪; 達也稲葉
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 2001-05-01
Filing date: 2001-05-01
Publication date: 2010-08-04
Anticipated expiration: 2021-05-01
Also published as: JP2002331316A

Description

【０００１】
【発明の属する技術分野】
本発明は、金属製の製品本体に金属製の板状部品を重ね合わせた２枚重ね製品を成形するためのプレス成形装置に関する。
【０００２】
【従来の技術】
従来、この種の２枚重ね製品は、製品本体と板状部品とを別々にプレス成形した後、製品本体に板状部品を溶接等で結合して製造している。然し、この方法では、製品本体用と板状部品用の各別のプレス成形装置が必要になり、製品の製造コストが高くなる不具合がある。
【０００３】
そのため、製品本体となる第１の板材に板状部品となる第２の板材を接合して成るブランク材を用い、単一のプレス成形装置で製品をプレス成形することが望まれる。この場合、ブランク材の第１の板材側に対向するダイと、第２の板材側に対向するパンチとを備えるプレス成形装置を使用し、ダイとパンチとの一方を他方に向けて押動させて、第１の板材の外縁部を拘束した状態で第１の板材を製品本体の形状に張出し成形しつつ、第２の板材を非拘束で製品本体に重なる板状部品の形状に成形することが考えられる。
【０００４】
【発明が解決しようとする課題】
上記の如く第２の板材を非拘束にして第１の板材を張出し成形すると、第１の板材が第２の板材からの成形反力を受けた状態で伸ばされる。そして、製品のリブ部２ａの端部のように、板状部品３となる第２の板材が材料の縮みを生じつつ成形される部分では、図４に示すように、第２の板材に材料の縮みに起因する皺ａが寄り、製品本体２となる第１の板材が皺ａによって突き押され、第１の板材に過大な引張力が作用して、製品本体２に亀裂ｂを生ずることがある。
【０００５】
本発明は、以上の点に鑑み、２枚重ね製品を亀裂を生ずることなく良好に成形し得るようにしたプレス成形装置を提供することを課題としている。
【０００６】
【課題を解決するための手段】
上記課題を解決すべく、本発明は、金属製の製品本体に金属製の板状部品を重ね合わせた２枚重ね製品を、製品本体となる第１の板材に板状部品となる第２の板材を接合して成るブランク材を用いて成形するプレス成形装置であって、ブランク材の第１の板材側に対向するダイと、第２の板材側に対向するパンチとを備え、ダイとパンチとの一方を他方に向けて押動させて、第１の板材の外縁部を拘束した状態で第１の板材を製品本体の形状に張出し成形しつつ、第２の板材を非拘束で製品本体に重なる板状部品の形状に成形するものにおいて、成形に際し材料の縮みを生ずる第２の板材の特定部位に合致するパンチの部分に、材料の縮みに対する該特定部位の材料の逃げ場所となる凹部を形成している。
【０００７】
本発明によれば、第２の板材の特定部位に材料の縮みによる皺がパンチの凹部に入り込むように発生する。そのため、第１の板材を突き押す方向への皺寄りが抑制され、第１の板材の亀裂を生ずることなく良好に２枚重ね製品を成形できる。
【０００８】
【発明の実施の形態】
図１（Ａ）は、金属製の製品本体２と、製品本体２のリブ部２ａの内面に重ね合わせた複強用の板状部品３とから成る２枚重ね製品１を示している。この製品１は、図１（Ｂ）に示す如く、製品本体２となる比較的薄い第１の板材２′に板状部品３となる比較的厚い第２の板材３′をその幅方向中央部において接着剤やスポット溶接等で接合して成るブランク材１′を用いてプレス成形される。
【０００９】
２枚重ね製品１のプレス成形装置は、図２に示す如く、下側のパンチ１０と、昇降自在な上側のダイ１１と、パンチ１０の周囲に配置した、ピン１２ａを介して上方に付勢されるブランクホルダ１２とを備えている。２枚重ね製品１のプレス成形に際しては、先ず、図２（Ａ）に示す如く、プレス成形装置に、第２の板材３′を下にした状態で第１の板材２′の成形領域の外縁部がブランクホルダ１２に着座するようにブランク材１′をセットし、次に、ダイ１１をパンチ１０に向けて下降させる。これによれば、第１の板材２′の外縁部がダイ１１のダイフェース部１１ａとブランクホルダ１２との間に挟まれて拘束され、この状態でブランク材１′がダイ１１によりブランクホルダ１２と共に押し下げられる。そして、第２の板材３′がパンチ１０に当接したところで、図２（Ｂ）に示す如く第１の板材２′の張出し成形が開始される。
【００１０】
張出し成形の初期段階では、第１の板材２′の第２の板材３′にオーバーラップする部分における変形が規制され、図２（Ｂ）に示す如く、主として第１の板材２′の第２の板材３′にオーバーラップしない部分が伸びを生じつつ変形する。その後、図２（Ｃ）に示す如く、第２の板材３′も変形し、最終的に、図２（Ｄ）に示す如く、ブランク材１′がパンチ１０とダイ１１との間に挟まれて、第１と第２の両板材２′，３′が夫々パンチ１０とダイ１１に合致する所要の形状、即ち、製品本体２の形状と製品本体２に重なる板状部品３の形状に成形される。
【００１１】
ここで、第２の板材３′の外縁部はブランクホルダ１２とダイ１１との間に挟まれておらず、第２の板材３′は非拘束で材料の伸びを生ずることなく成形される。そして、製品本体２のリブ部２ａの端部に合致する第２の板材３′の特定部位３′ａは、成形に際し曲げに加えて材料の縮みを生ずる。そのため、このままでは、特定部位３′ａに、図４に示す如く、第１の板材２′を突き押す方向の皺ａが寄り、第１の板材２′、即ち、製品本体２に亀裂ｂが発生する可能性がある。
【００１２】
そこで、本実施形態では、成形に際し材料の縮みを生ずる第２の板材３′の上記特定部位３′ａに合致するパンチ１０の部分に、図３（Ａ）に示す如く、凹部１０ａを形成している。これによれば、凹部１０ａが材料の縮みに対する特定部位３′ａの材料の逃げ場所となり、図３（Ｂ）に示す如く、材料の縮みによる皺ａ′が凹部１０ａに入り込むように発生し、第１の板材２′を突き押す方向の皺寄りが抑制され、製品本体２の亀裂の発生が防止される。尚、本実施形態では、特定部位３′ａの周長方向一端と中央との間及び周長方向他端と中央との間の２箇所に合致する部分に凹部１０ａを形成したが、これに限るものではなく、例えば、特定部位３′ａの周長方向両端と中央との３箇所に合致する部分に凹部を形成しても良い。
【００１３】
以上、パンチ１０の上方にダイ１１を配置したプレス成形装置について説明したが、パンチ１０とダイ１１を上下反転させ、パンチ１０の周囲に下方に付勢されるブランク押えを設け、ダイ１１上に第２の板材３′を上にしてブランク材１′をセットした後、パンチ１０を下降させることにより、第１の板材２′の外縁部をブランク押えとダイフェース部との間に挟んで拘束し、この状態で第１の板材２′を張出し成形しつつ、第２の板材３′を非拘束で成形するようにしたプレス成形装置にも同様に本発明を適用できる。
【００１４】
【発明の効果】
以上の説明から明らかなように、本発明によれば、第２の板材の特定部位における第１の板材を突き押す方向の皺寄りが抑制され、２枚重ね製品を亀裂を生ずることなく良好に成形できる。
【図面の簡単な説明】
【図１】（Ａ）２枚重ね製品の一例の斜視図、（Ｂ）この製品の成形に用いるブランク材の一例の斜視図
【図２】（Ａ）本発明に係るプレス成形装置へのブランク材のセット状態を示す断面図、（Ｂ）成形初期段階の断面図、（Ｃ）成形中間段階の断面図、（Ｄ）成形最終段階の断面図
【図３】（Ａ）パンチの斜視図、（Ｂ）図３（Ａ）のIIIB-IIIB線で截断した製品成形時の断面図
【図４】凹部の無いパンチを用いて成形した２枚重ね製品の斜視図
【符号の説明】
１２枚重ね製品２製品本体
３板状部品１′ ブランク材
２′ 第１の板材３′ 第２の板材
３′ａ特定部位１０パンチ
１０ａ凹部１１ダイ
１２ブランクホルダ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a press molding apparatus for molding a two-layer product in which metal plate-like parts are superimposed on a metal product body.
[0002]
[Prior art]
Conventionally, this type of two-ply product is manufactured by press-molding a product body and a plate-like component separately, and then joining the plate-like component to the product body by welding or the like. However, this method requires separate press molding apparatuses for the product main body and the plate-like component, and there is a problem that the manufacturing cost of the product increases.
[0003]
For this reason, it is desired to use a blank material formed by joining a second plate material serving as a plate-like component to a first plate material serving as a product body, and press-molding the product using a single press molding apparatus. In this case, a press molding apparatus including a die facing the first plate material side of the blank material and a punch facing the second plate material side is used, and one of the die and the punch is pushed toward the other. Then, while the outer edge of the first plate material is constrained, the first plate material is stretched and formed into the shape of the product body, and the second plate material is unconstrained and formed into the shape of a plate-like component that overlaps the product body. Can be considered.
[0004]
[Problems to be solved by the invention]
As described above, when the first plate member is stretched and formed without unconstraining the second plate member, the first plate member is stretched in a state where it receives a forming reaction force from the second plate member. Then, in the portion where the second plate material to be the plate-like component 3 is molded while shrinking the material, such as the end portion of the rib portion 2a of the product, as shown in FIG.皺 a caused by the shrinkage of the product is shifted, and the first plate material that becomes the product main body 2 is pushed by the heel a, and an excessive tensile force acts on the first plate material, thereby generating a crack b in the product main body 2. There is.
[0005]
In view of the above points, an object of the present invention is to provide a press forming apparatus that can form a two-ply product satisfactorily without causing cracks.
[0006]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides a two-layer product in which a metal plate-like component is superimposed on a metal product main body, and a second plate-like component that is a first plate material that is the product main body. A press molding apparatus for molding using a blank material formed by joining plate materials, the die comprising a die facing the first plate material side of the blank material and a punch facing the second plate material side, the die and the punch The first plate is stretched into the shape of the product body in a state where the outer edge of the first plate is constrained and the second plate is unconstrained and the product body In the shape of a plate-shaped part that overlaps with the punch, the concave portion serving as the escape location of the material at the specific portion with respect to the material shrinkage in the portion of the punch that matches the specific portion of the second plate material that causes the material to shrink during molding Is forming.
[0007]
According to the present invention, wrinkles due to shrinkage of the material are generated in a specific portion of the second plate so as to enter the recess of the punch. For this reason, the leaning in the direction of pushing the first plate material is suppressed, and a two-ply product can be molded well without causing cracks in the first plate material.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1A shows a two-ply product 1 composed of a metal product main body 2 and a double-strength plate-like component 3 superimposed on the inner surface of the rib portion 2 a of the product main body 2. As shown in FIG. 1B, the product 1 includes a relatively thin first plate 2 'serving as a product main body 2 and a relatively thick second plate 3' serving as a plate-like component 3 in a central portion in the width direction. In this method, the blank material 1 'formed by bonding with an adhesive or spot welding is used for press molding.
[0009]
As shown in FIG. 2, the press forming apparatus for the two-ply product 1 is urged upward via a lower punch 10, an upper die 11 that can be raised and lowered, and a pin 12 a disposed around the punch 10. The blank holder 12 is provided. When press-molding the two-layer product 1, first, as shown in FIG. 2 (A), the outer edge of the molding region of the first plate 2 ′ with the second plate 3 ′ in the press molding apparatus. The blank material 1 ′ is set so that the portion is seated on the blank holder 12, and then the die 11 is lowered toward the punch 10. According to this, the outer edge portion of the first plate member 2 ′ is sandwiched and restrained between the die face portion 11 a of the die 11 and the blank holder 12. In this state, the blank member 1 ′ is held by the die 11 with the blank holder 12. Is pushed down with. When the second plate 3 'comes into contact with the punch 10, overhanging of the first plate 2' is started as shown in FIG.
[0010]
In the initial stage of the overhang forming, the deformation of the first plate member 2 'at the portion overlapping the second plate member 3' is restricted, and as shown in FIG. 2 (B), the second plate of the first plate member 2 'is mainly used. The portion that does not overlap the plate material 3 'is deformed while being stretched. Thereafter, as shown in FIG. 2 (C), the second plate 3 'is also deformed, and finally, as shown in FIG. 2 (D), the blank 1' is sandwiched between the punch 10 and the die 11. Thus, both the first and second plate members 2 ′ and 3 ′ are formed into a required shape that matches the punch 10 and the die 11, that is, the shape of the product body 2 and the shape of the plate-like component 3 that overlaps the product body 2. Is done.
[0011]
Here, the outer edge portion of the second plate material 3 'is not sandwiched between the blank holder 12 and the die 11, and the second plate material 3' is formed without causing any material elongation without restriction. And the specific part 3'a of 2nd board | plate material 3 'which corresponds to the edge part of the rib part 2a of the product main body 2 produces a shrinkage | contraction of material in addition to a bending at the time of shaping | molding. Therefore, as shown in FIG. 4, the heel a in the direction of pushing the first plate member 2 ′ is shifted to the specific part 3 ′ a, and the first plate member 2 ′, that is, the product body 2 has a crack b. May occur.
[0012]
Therefore, in the present embodiment, as shown in FIG. 3A, a recess 10a is formed in a portion of the punch 10 that matches the specific portion 3'a of the second plate 3 'that causes material shrinkage during molding. ing. According to this, the concave portion 10a becomes the escape location of the material of the specific portion 3'a with respect to the shrinkage of the material, and as shown in FIG. The leaning in the direction of pushing the first plate 2 'is suppressed, and the occurrence of cracks in the product body 2 is prevented. In addition, in this embodiment, although the recessed part 10a was formed in the part corresponding to two places between the circumferential direction one end and center of specific site | part 3'a, and between the circumferential direction other end and the center, However, the present invention is not limited to this, and for example, recesses may be formed at portions that coincide with the three locations of the specific portion 3'a at both ends in the circumferential direction and at the center.
[0013]
The press forming apparatus in which the die 11 is disposed above the punch 10 has been described above. However, the punch 10 and the die 11 are turned upside down, and a blank presser that is biased downward is provided around the punch 10. After setting the blank 1 'with the second plate 3' facing up, the punch 10 is lowered to restrain the outer edge of the first plate 2 'between the blank presser and the die face. In this state, the present invention can be similarly applied to a press forming apparatus in which the first plate 2 'is stretched and the second plate 3' is formed unconstrained.
[0014]
【The invention's effect】
As is clear from the above description, according to the present invention, the leaning in the direction of pushing the first plate material at the specific portion of the second plate material is suppressed, and the two-ply product is favorably formed without causing cracks. Can be molded.
[Brief description of the drawings]
1A is a perspective view of an example of a two-ply product, FIG. 1B is a perspective view of an example of a blank material used for molding the product, and FIG. 2A is a blank for a press molding apparatus according to the present invention. Sectional view showing the set state of the material, (B) sectional view of the initial stage of molding, (C) sectional view of the intermediate stage of molding, (D) sectional view of the final stage of molding [FIG. 3] (A) perspective view of the punch, (B) Sectional view during product molding cut along line IIIB-IIIB in Fig. 3 (A) [Fig. 4] Perspective view of two-layer product molded using punches without recesses [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Two-ply product 2 Product main body 3 Plate-shaped part 1 'Blank material 2' First plate material 3 'Second plate material 3'a Specific part 10 Punch 10a Recess 11 Die 12 Blank holder

Claims

金属製の製品本体に金属製の板状部品を重ね合わせた２枚重ね製品を、製品本体となる第１の板材に板状部品となる第２の板材を接合して成るブランク材を用いて成形するプレス成形装置であって、
ブランク材の第１の板材側に対向するダイと、第２の板材側に対向するパンチとを備え、ダイとパンチとの一方を他方に向けて押動させて、第１の板材の外縁部を拘束した状態で第１の板材を製品本体の形状に張出し成形しつつ、第２の板材を非拘束で製品本体に重なる板状部品の形状に成形するものにおいて、
成形に際し材料の縮みを生ずる第２の板材の特定部位に合致するパンチの部分に、材料の縮みに対する該特定部位の材料の逃げ場所となる凹部を形成した、
ことを特徴とする２枚重ね製品のプレス成形装置。Using a two-ply product in which a metal plate body is superimposed on a metal product body, and using a blank material formed by joining a second plate material serving as a plate part to a first plate material serving as a product body A press molding apparatus for molding,
An outer edge portion of the first plate member is provided with a die facing the first plate member side of the blank material and a punch facing the second plate member side, and one of the die and the punch is pushed toward the other. In the state in which the first plate material is stretched and formed into the shape of the product body in a state where the second plate material is unconstrained and overlapped with the product body,
In the punch part that matches the specific part of the second plate that causes material shrinkage at the time of molding, a recess is formed that serves as the escape location of the material at the specific part against the material shrinkage.
A press-molding device for two-ply products characterized by the above.