JP6583305B2 - Forming method of flanged hole shape - Google Patents

Forming method of flanged hole shape Download PDF

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JP6583305B2
JP6583305B2 JP2017028997A JP2017028997A JP6583305B2 JP 6583305 B2 JP6583305 B2 JP 6583305B2 JP 2017028997 A JP2017028997 A JP 2017028997A JP 2017028997 A JP2017028997 A JP 2017028997A JP 6583305 B2 JP6583305 B2 JP 6583305B2
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metal plate
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JP2018134645A (en
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尾崎　芳宏
芳宏 尾崎
亮伸 石渡
亮伸 石渡
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JFE Steel Corp
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Description

本発明は、金属板を素材とした各種工業製品の成形方法に関し、特に穴フチにフランジを有するフランジ付き穴形状の成形方法に関するものである。   The present invention relates to a method for forming various industrial products using a metal plate as a raw material, and more particularly to a method for forming a flanged hole shape having a flange at a hole edge.

金属板を素材とするフランジ付き穴形状の成形には、例えば、特許文献１に記載されるバーリング加工、あるいは特許文献２に記載される円筒絞り成形が用いられるのが一般的である。   For forming a flanged hole shape made of a metal plate, for example, burring described in Patent Document 1 or cylindrical drawing described in Patent Document 2 is generally used.

特開２０１０−７５９３１号公報JP 2010-75931 A 特開２０１０−９４７１６号公報JP 2010-94716 A

バーリング加工による加工方法を図５、図６に基づいて説明する。
バーリング加工はブランク１１に製品径より小さい径の下穴３(φd)をあけた後（図５（ａ）参照）、ブランク１１をダイ１３とブランクホルダ１５で挟み、製品の目標穴内径(φD)と同じ直径のパンチ１７で押し広げながらフランジ１１ａを立て（図６（ａ）〜（ｃ）参照）、あるいはさらに所定のフランジ１１ａを残して底部を切除すること（図５（ｂ）参照）で所望の形状を得る（図５（ｃ）参照）。このとき、目標とする穴径だけでなくフランジ１１ａの高さも考慮して下穴径を決める必要がある。すなわち、製品の目標フランジ高さをｈとすれば下穴径φdはｄ+2ｈ=Ｄを目安に調整する必要がある。一方で穴フチの最大伸び率はＤ/ｄなので、フランジ高さ(ｈ)が高いときはｄが小さくなって穴フチの伸び率も大きくなり穴フチには割れを生じやすい。
バーリング加工による従来法では外側（ブランク１１）からの材料流入が殆どない。その結果、下穴３のある中央側からの材料流入が支配的となり、下穴３の穴フチの伸びが大きく割れを生じやすい（図７参照）。 A processing method by burring will be described with reference to FIGS.
In the burring process, after preparing a pilot hole 3 (φd) smaller than the product diameter in the blank 11 (see FIG. 5A), the blank 11 is sandwiched between the die 13 and the blank holder 15, and the target hole inner diameter (φD of the product) The flange 11a is erected while being widened with the punch 17 having the same diameter as that of) (see FIGS. 6 (a) to 6 (c)), or further, the bottom is excised leaving the predetermined flange 11a (see FIG. 5 (b)). To obtain a desired shape (see FIG. 5C). At this time, it is necessary to determine the prepared hole diameter in consideration of not only the target hole diameter but also the height of the flange 11a. That is, if the target flange height of the product is h, the pilot hole diameter φd needs to be adjusted with d + 2h = D as a guide. On the other hand, since the maximum elongation rate of the hole border is D / d, when the flange height (h) is high, d becomes small and the elongation rate of the hole border increases, and the hole border tends to crack.
In the conventional method by burring, there is almost no material inflow from the outside (blank 11). As a result, the material inflow from the center side where the pilot hole 3 is located becomes dominant, and the elongation of the hole edge of the pilot hole 3 is large and easily cracks (see FIG. 7).

このような課題を解決するため、ブランク１１を伸び変形の大きな材質のものに変更したり、下穴３を打抜きする際にクリアランス調整によって切断時の破断面を少なくしたり、あるいはバリの出る方向をフランジ１１ａの内側にするなどの方法がとられる。   In order to solve such a problem, the blank 11 is changed to a material having a large stretch deformation, or when the pilot hole 3 is punched out, the clearance is adjusted to reduce the fracture surface during cutting, or the direction in which burrs appear. A method such as setting the inside of the flange 11a is used.

次に、円筒絞り成形による加工方法を図８、図９に基づいて説明する。
円筒絞り成形はブランク１１に下穴３をあけることなく（図８（ａ）参照）、製品の目標穴内径と同じ直径のパンチ１７で円筒形状に絞り加工した後（図９（ａ）〜（ｃ）参照）、所定高さのフランジ１１ａを残して底部を切除することで（図８（ｂ）参照）、フランジ付穴形状を得る（図８（ｃ）参照）。フランジ１１ａを高くするためには円筒絞りを深くする必要があり、目標の円筒絞りに到達せずにパンチ肩部で割れを生じることがある（図１０（ａ）参照）。
この割れを防ぐ対策として円筒絞りのプレス成形におけるシワ押さえ荷重を低減して材料を流入しやすくすると、割れは生じなくなるが、ブランク面にシワが発生して部品の品質（平坦度）が阻害されることもある（図１０（ｂ）参照）。 Next, a processing method by cylindrical drawing will be described with reference to FIGS.
Cylindrical drawing is performed without drawing the pilot hole 3 in the blank 11 (see FIG. 8A), and after drawing into a cylindrical shape with a punch 17 having the same diameter as the target hole inner diameter of the product (FIGS. 9A to 9 ( c)), and by removing the bottom portion with the flange 11a having a predetermined height (see FIG. 8B), a flanged hole shape is obtained (see FIG. 8C). In order to raise the flange 11a, it is necessary to deepen the cylindrical diaphragm, and the punch shoulder may be cracked without reaching the target cylindrical diaphragm (see FIG. 10A).
As a measure to prevent this cracking, reducing the wrinkle pressing load in the press forming of the cylindrical drawing and making it easier for the material to flow in will prevent cracking, but it will cause wrinkles on the blank surface and hinder the quality (flatness) of the parts. (See FIG. 10B).

以上のように、従来の対処方法も、必ずしも十分なものでなく、目標とする製品形状の穴径とフランジ高さによっては成形ができない場合もあった。   As described above, the conventional countermeasures are not always sufficient, and there are cases where molding cannot be performed depending on the hole diameter and flange height of the target product shape.

本発明は、かかる課題を解決するためになされたものであり、従来のバーリング加工や円筒絞り成形では割れを生じて困難であったフランジ付穴形状を成形することのできるフランジ付き穴形状の成形方法を提供することを目的としている。   The present invention has been made in order to solve the above-described problems, and has a flanged hole shape that can form a flanged hole shape that has been difficult to crack in conventional burring and cylindrical drawing. It aims to provide a method.

（１）本発明に係るフランジ付き穴形状の成形方法は、金属板にフランジ付き穴形状を形成するフランジ付き穴形状の成形方法であって、
母材金属板に下穴を形成する下穴形成工程と、前記下穴を前記母材金属板よりも変形しやすい金属板からなる閉塞部材で塞いで該閉塞部材を前記母材金属板に接合して成形用のブランクとするブランク製造工程と、前記ブランクにおける前記閉塞部材を含む部分を円筒絞り成形する円筒絞り成形工程と、円筒形状の底部を切除して前記閉塞部材を取り除く工程とを備えたことを特徴とするものである。 (1) The flanged hole shape forming method according to the present invention is a flanged hole shape forming method for forming a flanged hole shape in a metal plate,
A pilot hole forming step of forming a pilot hole in a base metal plate, and the pilot hole is closed with a closure member made of a metal plate that is more easily deformed than the base metal plate, and the closure member is joined to the base metal plate A blank manufacturing process for forming a blank for molding, a cylindrical drawing process for cylindrical drawing of a portion including the closing member in the blank, and a process for removing the closing member by cutting a cylindrical bottom. It is characterized by that.

（２）また、上記（１）に記載のものにおいて、前記閉塞部材は、強度が前記母材金属板と同等もしくは大きく板厚が前記母材金属板よりも薄い金属板、または強度が前記母材金属板より小さく板厚が前記母材金属板と同等もしくは厚い金属板からなることを特徴とするものである。 (2) Further, in the above (1), the closing member is a metal plate having a strength equal to or greater than that of the base metal plate and a thickness smaller than that of the base metal plate, or a strength of the base member. It is characterized in that it is made of a metal plate that is smaller than the base metal plate and has a thickness equal to or thicker than that of the base metal plate.

本発明においては、母材金属板に下穴を形成する下穴形成工程と、前記下穴を前記母材金属板よりも変形しやすい金属板からなる閉塞部材で塞いで該閉塞部材を前記母材金属板に接合して成形用のブランクとするブランク製造工程と、前記ブランクにおける前記閉塞部材を含む部分を円筒絞り成形する円筒絞り成形工程と、円筒形状の底部を切除して前記閉塞部材を取り除く工程とを備えたことにより、バーリング加工や円筒絞り成形では割れが生じる場合にも、割れを生ずることなく成形することができ、成形できる形状の範囲を拡大できる。   In the present invention, a pilot hole forming step of forming a pilot hole in a base metal plate, and the pilot hole is closed with a closure member made of a metal plate that is more easily deformed than the base metal plate, and the closure member is covered with the base metal plate. A blank manufacturing process for forming a blank for molding by joining to a metal plate, a cylindrical drawing process for cylindrical drawing of a portion including the closing member in the blank, and cutting the cylindrical bottom to remove the closing member In the case where cracking occurs in the burring process or cylindrical drawing, it is possible to form without cracking and to expand the range of shapes that can be molded.

本発明の一実施の形態におけるフランジ付き穴形状の成形方法の説明図である。It is explanatory drawing of the shaping | molding method of the hole shape with a flange in one embodiment of this invention. 図１に示したフランジ付き穴形状の成形方法の一部の工程の説明図である。It is explanatory drawing of the one part process of the shaping | molding method of the hole shape with a flange shown in FIG. 実施例１で行った条件１〜５の説明図である。It is explanatory drawing of the conditions 1-5 performed in Example 1. FIG. 実施例２で行った条件６、７の説明図である。It is explanatory drawing of the conditions 6 and 7 performed in Example 2. FIG. 従来のバーリング加工の説明図である。It is explanatory drawing of the conventional burring process. 図５に示したバーリング加工の一部の工程の説明図である。It is explanatory drawing of the one part process of the burring process shown in FIG. 図５に示したバーリング加工の問題点を説明する説明図である。It is explanatory drawing explaining the problem of the burring process shown in FIG. 従来の円筒絞り成形の説明図である。It is explanatory drawing of the conventional cylindrical drawing. 図８に示した円筒絞り成形の一部の工程の説明図である。It is explanatory drawing of the one part process of the cylindrical drawing shown in FIG. 図８に示した円筒絞り成形の問題点を説明する説明図である。It is explanatory drawing explaining the problem of the cylindrical draw forming shown in FIG.

本発明の一実施の形態に係るフランジ付き穴形状の成形方法は、図１に示すように、母材金属板１に下穴３(φd)を形成する下穴形成工程と（図１（ａ）参照）、下穴３を母材金属板１よりも変形しやすい金属板からなる閉塞部材５で塞いで閉塞部材５を母材金属板１に接合して成形用のブランク７とするブランク製造工程と（図１（ｂ）参照）、ブランク７における閉塞部材５を含む部分を円筒絞り成形する円筒絞り成形工程（図２（ａ）〜（ｃ）参照）と、円筒形状の底部を切除して閉塞部材５を取り除く工程（図１（ｃ）〜（ｄ）参照）とを備えたものである。   The flanged hole shape forming method according to one embodiment of the present invention includes a pilot hole forming step of forming a pilot hole 3 (φd) in a base metal plate 1 as shown in FIG. )), The blank 3 is closed with a closing member 5 made of a metal plate that is easier to deform than the base metal plate 1 and the closing member 5 is joined to the base metal plate 1 to form a blank 7 for forming. A process (see FIG. 1B), a cylindrical drawing process (see FIGS. 2A to 2C) in which a portion including the closing member 5 in the blank 7 is formed by cylindrical drawing, and a cylindrical bottom portion is cut off. And a step of removing the closing member 5 (see FIGS. 1C to 1D).

ブランク製造工程において用いる閉塞部材５は、母材金属板１よりも変形しやすい金属板であればよく、形状、強度（材質）と板厚等を適宜選択することで種々の態様を取り得る。
例えば、強度が母材金属板１と同等で板厚が母材金属板１よりも薄いものを適用できる。また、強度が母材金属板１よりも大きくても、板厚を母材金属板１よりも十分薄くすることで母材金属板１よりも変形しやすくすることもできる。
また、強度が母材金属板１よりも小さく板厚が母材金属板１と同等のものを適用できる。また、強度が母材金属板１よりも十分小さければ、母材金属板１よりも板厚が厚いものも適用できて、母材金属板１よりも変形しやすくすることができる。 The closing member 5 used in the blank manufacturing process may be a metal plate that is more easily deformed than the base metal plate 1 and can take various forms by appropriately selecting the shape, strength (material), plate thickness, and the like.
For example, a material whose strength is equivalent to that of the base metal plate 1 and whose thickness is thinner than that of the base metal plate 1 can be applied. Further, even if the strength is greater than that of the base metal plate 1, it is possible to make it easier to deform than the base metal plate 1 by making the plate thickness sufficiently thinner than the base metal plate 1.
In addition, a material having a strength smaller than that of the base metal plate 1 and a thickness equivalent to that of the base metal plate 1 can be applied. If the strength is sufficiently lower than that of the base metal plate 1, a material having a thickness greater than that of the base metal plate 1 can be applied, and the base metal plate 1 can be more easily deformed.

加工後は目的のフランジ高さとするため、閉塞部材５は切除されるので、完成部品の形状と品質に応じて閉塞部材５の強度（材質）、径、板厚等を任意に選ぶことができる。つまり、閉塞部材５は、完成部品に残存するわけではなく、フランジ７ａの成形だけを考慮して適宜選択できるので、最も成形に適切なものを選択できる。   After the processing, the closing member 5 is cut out in order to obtain the desired flange height, so that the strength (material), diameter, plate thickness, etc. of the closing member 5 can be arbitrarily selected according to the shape and quality of the finished part. . That is, the closing member 5 does not remain in the completed part, but can be selected as appropriate considering only the molding of the flange 7a. Therefore, the most suitable member for molding can be selected.

閉塞部材５の母材金属板１への接合方法は特に限定されないが、例えば溶接や、樹脂等のいわゆる接着剤を用いてもよい。閉塞部材５を接合する場合、必ずしも全周を接合する必要はなく部分的な接合であってもよく、等間隔で行う点付接合のように偏りなく接合されているとさらによい。
閉塞部材５は母材金属板１に形成した下穴３とほぼ同じか若干小さくして下穴３にはめ込むようにしてもよいし、あるいは下穴径よりも大きな面積で下穴３を覆うようにして塞いでもよい。 A method for joining the closing member 5 to the base metal plate 1 is not particularly limited, but for example, a so-called adhesive such as welding or resin may be used. When the blocking member 5 is joined, it is not always necessary to join the entire circumference, and partial joining may be used, and it is further preferable that the joining is performed without unevenness, such as dotted joining performed at equal intervals.
The blocking member 5 may be fitted to the pilot hole 3 so as to be substantially the same as or slightly smaller than the pilot hole 3 formed in the base metal plate 1, or may cover the pilot hole 3 with an area larger than the pilot hole diameter. It may be closed.

円筒絞り成形工程は、図２に示すように、ダイ１３とブランクホルダ１５でブランク７を挟み、パンチ１７をダイ１３側に移動してフランジ７ａを形成する工程である。
円筒絞り成形工程では、下穴３が母材金属板１よりも変形しやすい閉塞部材５で塞がれているため、バーリング加工のような穴フチが過剰に伸ばされることによる割れ発生が回避される。また、かかる円筒絞り成形には、閉塞部材５が伸ばされて径を拡大する変形だけでなく、バーリング加工とは異なるため、円筒部の周辺の母材金属板１が縦壁に流入する変形も寄与する。すなわちフランジに対応する円筒部の縦壁には母材金属板１の下穴周辺と、母材金属板１の周囲の両方から材料が移動して成形されるため下穴フチの広がりは従来のバーリング加工に較べて低減され、それ故に割れが抑制される。 As shown in FIG. 2, the cylindrical drawing process is a process in which the blank 7 is sandwiched between the die 13 and the blank holder 15, and the punch 17 is moved to the die 13 side to form the flange 7a.
In the cylindrical drawing process, since the prepared hole 3 is closed with the closing member 5 that is more easily deformed than the base metal plate 1, the occurrence of cracks due to excessive extension of the hole edge such as burring is avoided. The Further, in this cylindrical drawing, not only is the deformation in which the closing member 5 is stretched to expand the diameter but also the burring process, the deformation in which the base metal plate 1 around the cylindrical portion flows into the vertical wall is also included. Contribute. That is, since the material moves from both the periphery of the base metal plate 1 and the periphery of the base metal plate 1 on the vertical wall of the cylindrical portion corresponding to the flange, the spread of the pilot hole border is conventional. Compared to burring, it is reduced and hence cracking is suppressed.

また、閉塞部材５は、母材金属板１よりも変形しやすい材料であるため、従来の円筒絞り成形では成形できない深さ（高さ）まで加工することもできる。   Further, since the closing member 5 is a material that is more easily deformed than the base metal plate 1, it can be processed to a depth (height) that cannot be formed by conventional cylindrical drawing.

閉塞部材５を取り除く工程では、図１（ｄ）に示すように、閉塞部材５を含む底部全体を切除してもよいし、閉塞部材５は切除するものの底部の一部を残すように切除してもよい。   In the step of removing the blocking member 5, as shown in FIG. 1D, the entire bottom including the blocking member 5 may be cut out, or the blocking member 5 is cut out so as to leave a part of the bottom of the cut. May be.

以上のように、本実施の形態によれば、バーリング加工では穴フチが極度に変形するために生じていたフチ割れの問題と、従来の円筒絞り成形では下穴３を設けないためにパンチ肩部の割れが発生して絞り深さが制約されていたことの両方を解決することできる。
したがって、フランジ付き穴形状の成形において、バーリング加工や円筒絞り成形では割れを生じる場合に本発明を適用することで成形性が向上し、割れのない成形が可能な範囲を拡大できる。 As described above, according to the present embodiment, the problem of the edge crack that occurs due to extreme deformation of the hole edge in the burring process, and the punch shoulder because the pilot hole 3 is not provided in the conventional cylindrical drawing. It is possible to solve both of the occurrence of cracks in the portion and the restriction of the drawing depth.
Therefore, in the formation of a flanged hole shape, when cracking occurs in burring or cylindrical drawing, the present invention is applied to improve formability, and the range where molding without cracking is possible can be expanded.

本発明の効果を確認する実験を行ったので、以下これについて説明する。
実施例１では、閉塞部材の材料強度を母材金属板と同等にし、板厚を母材金属板よりも薄くした場合において、その板厚を変化させた場合について検討した。
実験は、板厚0.50mm、200×300mmサイズのフェライト系ステンレス鋼板（YS=310MPa,TS=480MPa）を母材金属板として、中央に穴内径φ100のフランジ付き穴形状を成形するというものである。
加工方法は以下に示す条件１〜５で、いずれの条件でも、直径φ100、パンチ肩RがR=5mmの平頭形状パンチを用いた。また、条件１〜５のそれぞれでパンチのストロークを5、10、15、20、25、30mmと変化させて比較した。 An experiment for confirming the effect of the present invention was conducted, and this will be described below.
In Example 1, when the material strength of the blocking member was made equal to that of the base metal plate and the plate thickness was made thinner than that of the base metal plate, the case where the plate thickness was changed was examined.
In the experiment, a ferritic stainless steel plate (YS = 310MPa, TS = 480MPa) with a plate thickness of 0.50mm and a size of 200x300mm was used as the base metal plate, and a hole with a flange with a hole inner diameter of φ100 was formed in the center. .
The processing method was the following conditions 1 to 5, and a flat head punch having a diameter φ100 and a punch shoulder R of R = 5 mm was used under any condition. In addition, in each of the conditions 1 to 5, the punch stroke was changed to 5, 10, 15, 20, 25, and 30 mm for comparison.

●条件１（比較例）
ブランク１１の中央に下穴３（φ40）をあけ、バーリング加工を行う（図３（ａ）参照）。なお、Ｓはパンチストロークであり、ｈはフランジ高さを示している。
●条件２（発明例）
母材金属板１の中央に下穴３（φ40）をあけ、その下穴３を板厚0.20mmの母材金属板１と同等の材質のフェライト系ステンレス鋼板（閉塞部材５）で塞ぎ、閉塞部材５をレーザーで円周方向12箇所を点付けで突合せ溶接してブランク７とし、これを円筒絞り成形した（図３（ｂ）参照）。
●条件３（発明例）
条件３は、閉塞部材５の板厚を0.25mmとしたものであり、他の条件は条件２と同じである。
●条件４（発明例）
条件４は、閉塞部材５の板厚を0.30mmとしたものであり、他の条件は条件２と同じである。
●条件５（比較例）
ブランク１１に下穴３をあけることなく、円筒絞り成形を行った（図３（ｃ）参照）。 ● Condition 1 (Comparative example)
A pilot hole 3 (φ40) is formed in the center of the blank 11 and burring is performed (see FIG. 3A). In addition, S is a punch stroke and h indicates the height of the flange.
● Condition 2 (Invention example)
Drill a pilot hole 3 (φ40) in the center of the base metal plate 1 and close the pilot hole 3 with a ferritic stainless steel plate (blocking member 5) of the same material as the base metal plate 1 having a thickness of 0.20 mm. The member 5 was butt welded with a laser at 12 points in the circumferential direction to make a blank 7, which was formed by cylindrical drawing (see FIG. 3B).
● Condition 3 (Invention example)
Condition 3 is that the thickness of the closing member 5 is 0.25 mm, and other conditions are the same as condition 2.
● Condition 4 (Invention example)
Condition 4 is that the thickness of the closing member 5 is 0.30 mm, and other conditions are the same as condition 2.
● Condition 5 (Comparative example)
Cylindrical drawing was performed without making the pilot hole 3 in the blank 11 (see FIG. 3C).

表１に条件１〜５で成形または加工した結果を示す。   Table 1 shows the results of molding or processing under conditions 1-5.

Figure 0006583305
Figure 0006583305

実施例１の結果によると、条件１の従来のバーリング加工および、条件５の下穴３のない円筒絞り成形ではフランジ高さ10mm（パンチストローク15mm）が限界であったのに対して、本発明例である条件２〜条件４ではいずも成形可能なフランジ高さの限界が向上した。
上記の結果から、下穴３を塞ぐ閉塞部材５を、母材金属板１より板厚を薄くして、相対的に変形しやすくすることで、成形性向上の効果が得られることが明らかとなった。 According to the result of Example 1, in the conventional burring process of Condition 1 and the cylindrical drawing without the pilot hole 3 of Condition 5, the flange height of 10 mm (punch stroke 15 mm) was the limit, but the present invention In Examples 2 to 4, which are examples, the limit of the height of the flange that can be molded is improved.
From the above results, it is clear that the formability improvement effect can be obtained by making the blocking member 5 that closes the pilot hole 3 thinner than the base metal plate 1 and relatively easily deforming. became.

なお、表１に示されるように、条件２，３，４の発明例はそれぞれ比較例より改善しているが、成形の限界フランジ高さは必ずしも条件２→３→４の順（あるいはその逆）にはなっていない。閉塞部材５の板厚が薄い（板厚：0.20mm）条件２での変形挙動の割れ形態は条件1に類似し、レーザーで点付け接合されていない穴フチから割れが発生した。
他方、閉塞部材５の板厚0.30mmの条件４での変形挙動の割れ形態は条件５に類似していた。
その結果として、閉塞部材５の板厚を条件２と条件４の中間とする条件３のような最適な条件設定があることが明らかになった。 As shown in Table 1, the invention examples of conditions 2, 3, and 4 are improved from the comparative examples, but the limit flange height of the molding is not necessarily in the order of conditions 2 → 3 → 4 (or vice versa). It is not. The cracking behavior of the deformation behavior under condition 2 where the plate thickness of the closing member 5 was thin (plate thickness: 0.20 mm) was similar to condition 1, and cracks occurred from the hole borders that were not spot-bonded by the laser.
On the other hand, the cracking form of the deformation behavior of the blocking member 5 under condition 4 with a plate thickness of 0.30 mm was similar to condition 5.
As a result, it has been clarified that there is an optimum condition setting such as condition 3 in which the plate thickness of the closing member 5 is between condition 2 and condition 4.

実施例２では、閉塞部材５の板厚を母材金属板１と同等とし、材料強度を母材金属板１よりも小さくした場合において、その強度を変化させた場合について検討した。
実施例1と同様に、板厚0.50mm、200×300mmサイズのフェライト系ステンレス鋼板（YS=310MPa、TS=480MPa）を母材金属板１として、中央に穴内径φ100のフランジ付き穴形状を成形する。加工方法は以下に示す条件６、７とし、いずれの条件でも、直径φ100、パンチ肩RはR=5mmの平頭形状パンチを用いた。
また、それぞれパンチのストロークを5、10、15、20、25、30mmとして比較した。目標としたフランジ付き穴形状を図４に示す。 In Example 2, when the plate | board thickness of the obstruction | occlusion member 5 was made equivalent to the base metal plate 1, and the material intensity | strength was made smaller than the base metal plate 1, the case where the intensity | strength was changed was considered.
As in Example 1, a ferritic stainless steel plate (YS = 310MPa, TS = 480MPa) with a plate thickness of 0.50mm and a size of 200x300mm is used as the base metal plate 1, and a hole with a flange with an inner diameter of φ100 is formed in the center. To do. The processing methods were conditions 6 and 7 shown below, and a flat head punch having a diameter of φ100 and a punch shoulder R of R = 5 mm was used in both conditions.
In addition, comparison was made with punch strokes of 5, 10, 15, 20, 25, and 30 mm, respectively. The target flanged hole shape is shown in FIG.

●条件６（発明例）
母材金属板１の中央に下穴３（φ40）をあけ、その下穴３を板厚0.50mmでYS=195MPa、TS=400MPaのフェライト系ステンレス鋼板（閉塞部材５）で塞ぎ、閉塞部材５をアーク溶接で穴の全周を接合してブランク７とし、これを円筒絞り成形した。
●条件７（発明例）
条件７は、閉塞部材５の強度をYS=245MPa、TS=429MPaとしたものであり、他の条件は条件６と同じである。
表2には条件1、6、7、5で成形または加工した結果を示す。 ● Condition 6 (Invention example)
A pilot hole 3 (φ40) is made in the center of the base metal plate 1, and the pilot hole 3 is closed with a ferritic stainless steel plate (occlusion member 5) with a plate thickness of 0.50 mm and YS = 195 MPa and TS = 400 MPa. The whole circumference of the hole was joined by arc welding to form a blank 7, which was subjected to cylindrical drawing.
● Condition 7 (Invention example)
Condition 7 is that the strength of the closing member 5 is YS = 245 MPa, TS = 429 MPa, and other conditions are the same as condition 6.
Table 2 shows the results of molding or processing under conditions 1, 6, 7, and 5.

Figure 0006583305
Figure 0006583305

表２に示すように、条件１の従来のバーリング加工および、条件５の下穴３のない円筒絞り成形ではフランジ高さ10mmが限界であったのに対して、本発明例である条件6、条件7ではいずれも成形可能なフランジ高さの限界が向上した。
上記の結果から、下穴３を塞ぐ閉塞部材５を母材金属板１より強度を小さくして、相対的に変形しやすくすることで、成形性向上の効果が得られることが明らかとなった。
なお、閉塞部材５がより軟質な条件６での変形挙動と割れ形態は条件1に類似している。他方、閉塞部材５が条件６よりも硬質な条件７での変形挙動と割れ形態は条件５に類似している。 As shown in Table 2, in the conventional burring process of Condition 1 and the cylindrical drawing without the pilot hole 3 of Condition 5, the flange height of 10 mm was the limit, while the condition 6 of the present invention example, In condition 7, the limit of the height of the flange that can be molded was improved.
From the above results, it has been clarified that the effect of improving the formability can be obtained by reducing the strength of the closing member 5 that closes the prepared hole 3 and making it relatively easy to deform than the base metal plate 1. .
It should be noted that the deformation behavior and crack form under condition 6 in which the closing member 5 is softer are similar to those in condition 1. On the other hand, the deformation behavior and crack form in condition 7 where the closing member 5 is harder than condition 6 are similar to condition 5.

１ 母材金属板
３ 下穴
５ 閉塞部材
７ ブランク
７ａ フランジ
１１ ブランク（従来例）
１１ａ フランジ（従来例）
１３ ダイ
１５ ブランクホルダ
１７ パンチ 1 Base metal plate 3 Pilot hole 5 Blocking member 7 Blank 7a Flange 11 Blank (conventional example)
11a Flange (conventional example)
13 Die 15 Blank holder 17 Punch

Claims (2)

金属板にフランジ付き穴形状を形成するフランジ付き穴形状の成形方法であって、
母材金属板に下穴を形成する下穴形成工程と、前記下穴を前記母材金属板よりも変形しやすい金属板からなる閉塞部材で塞いで該閉塞部材を前記母材金属板に接合して成形用のブランクとするブランク製造工程と、前記ブランクにおける前記閉塞部材を含む部分を円筒絞り成形する円筒絞り成形工程と、円筒形状の底部を切除して前記閉塞部材を取り除く工程とを備えたことを特徴とするフランジ付き穴形状の成形方法。 A method for forming a flanged hole shape to form a flanged hole shape in a metal plate,
A pilot hole forming step of forming a pilot hole in a base metal plate, and the pilot hole is closed with a closure member made of a metal plate that is more easily deformed than the base metal plate, and the closure member is joined to the base metal plate A blank manufacturing process for forming a blank for molding, a cylindrical drawing process for cylindrical drawing of a portion including the closing member in the blank, and a process for removing the closing member by cutting a cylindrical bottom. A method for forming a flanged hole shape, characterized in that 前記閉塞部材は、強度が前記母材金属板と同等もしくは大きく板厚が前記母材金属板よりも薄い金属板、または強度が前記母材金属板より小さく板厚が前記母材金属板と同等もしくは厚い金属板からなることを特徴とする請求項１記載のフランジ付き穴形状の成形方法。   The closing member is a metal plate whose strength is equal to or greater than that of the base metal plate and whose thickness is thinner than that of the base metal plate, or whose strength is smaller than that of the base metal plate and which is equal to that of the base metal plate. 2. The method of forming a flanged hole shape according to claim 1, wherein the forming method comprises a thick metal plate.
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