JPH0381021A - Method for forming flange for front fender - Google Patents
Method for forming flange for front fenderInfo
- Publication number
- JPH0381021A JPH0381021A JP21937789A JP21937789A JPH0381021A JP H0381021 A JPH0381021 A JP H0381021A JP 21937789 A JP21937789 A JP 21937789A JP 21937789 A JP21937789 A JP 21937789A JP H0381021 A JPH0381021 A JP H0381021A
- Authority
- JP
- Japan
- Prior art keywords
- flange
- front fender
- flange part
- bending
- flange portion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims description 12
- 238000005452 bending Methods 0.000 claims abstract description 12
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000004049 embossing Methods 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
Landscapes
- Bending Of Plates, Rods, And Pipes (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、自動車のフロントフェンダのフランジ成形方
法に関し、さらに詳しくはフロントフェンダの後端部に
折曲形成されるフランジ部の成形方法に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for forming a flange on a front fender of an automobile, and more particularly to a method for forming a flange portion to be bent at the rear end of a front fender.
従来の技術
第５図および第６図に示すように自動車のフロントフェ
ンダ１の後端部すなわちフロントドアの前端部と対峙す
る部分には、フロントフェンダ１の一般部２に対し４５
度程度の角度αをもって断面略くの字状のフランジ部３
が形成される。BACKGROUND ART As shown in FIGS. 5 and 6, the rear end portion of a front fender 1 of an automobile, that is, the portion facing the front end portion of the front door, has a diameter of 45 mm with respect to the general portion 2 of the front fender 1.
The flange portion 3 has a dogleg-shaped cross section with an angle α of approximately
is formed.
そして、第８図に示すように予め所定の三次元形状に絞
り成形されたフロントフェンダ１の後’４部にほぼ直角
なプリフランジ部４を形成しておき、フロントフェンダ
１を下型としてのポンチ５上に載せて上型６０１１Ｊの
パッド７で拘束した上、ドライブカム８により駆動され
るスライドカム９をポンチ５に対し前進させることでフ
ランジ部３が成形される。１０はスライドカム９に固定
されたフランジ加工用のセクショナルダイで、スライド
カム９は、パッド７とともに上型６を構成する上ホルダ
１１にスライド可能に支持されている。As shown in FIG. 8, a substantially right-angled preflange portion 4 is formed at the rear portion of the front fender 1 which has been previously drawn into a predetermined three-dimensional shape, and the front fender 1 is used as a lower mold. The flange portion 3 is formed by placing it on the punch 5 and restraining it with the pad 7 of the upper die 6011J, and then moving the slide cam 9 driven by the drive cam 8 forward relative to the punch 5. Reference numeral 10 denotes a sectional die for flange processing fixed to the slide cam 9. The slide cam 9 is slidably supported by an upper holder 11 that constitutes the upper die 6 together with the pad 7.
発明が解決しようとする課題
従来のフランジ成形方法においては、プリフランジ部４
そのものが曲線に沿った曲線曲げであり、しかもプリフ
ランジ部４をフランジ部３に成形する際には極端な伸び
フランジとなることからフランジ部３に残留応力が発生
する。そして、この残留応力の影響により一般部２のう
ちフランジ部３の折曲基部１２に近い部分に第７図のよ
うな「だれ」と称されるひずみ１３が発生し、フロント
フェンダ１の形状精度の向上に限界がある。Problems to be Solved by the Invention In the conventional flange forming method, the preflange portion 4
This is a curved bend along a curve, and when the preflange part 4 is formed into the flange part 3, it becomes an extremely stretched flange, so that residual stress is generated in the flange part 3. Due to the influence of this residual stress, a strain 13 called "sag" as shown in FIG. There are limits to how much improvement can be made.
本発明は以上のような問題点に鑑みてなされたもので、
その目的とするところは、−股部への残留応力の影響を
小さくしてひずみの発生を防止したフランジ成形方法を
提供することにある。The present invention was made in view of the above problems.
The purpose is to provide a flange forming method that reduces the influence of residual stress on the crotch and prevents the occurrence of distortion.
課題を解決するための手段
本発明のフランジ成形方法においては、下型とスライド
カムとの協働によりプリフランジ部を一般部に対し所定
の角度で折曲基部から折り曲げて断面略＜の字状のフラ
ンジ部を成形しつつ、フランジ部のうち折曲基部に近い
部分にフランジ部の長手方向に沿って多数のエンボス部
を成形することを特徴としている。Means for Solving the Problems In the flange forming method of the present invention, the pre-flange part is bent from the bending base at a predetermined angle with respect to the general part by cooperation of a lower mold and a slide cam, so that the cross section is shaped like the letter <<. While forming the flange portion, a large number of embossed portions are formed along the longitudinal direction of the flange portion in a portion of the flange portion near the bending base.
作用
上記の方法によると、所定のボリュームをもったエンボ
ス部をフランジ部に同時成形することによってフランジ
部の残留応力の連続性が断ち切られ、残留応力の影響が
一般部に表れにくくなる。Effect According to the above method, by simultaneously forming an embossed portion with a predetermined volume on the flange portion, the continuity of residual stress in the flange portion is broken, and the influence of residual stress is less likely to appear in the general portion.
その結果として、−股部のうちフランジ部に近い部分で
の「だれ」と称されるひずみの発生がなくなる。As a result, the occurrence of strain called "sagging" in the portion of the crotch portion near the flange portion is eliminated.
実施例
第１図〜第４図は本発明の一実施例を示す図で、従来例
と共通する部分には同一符号を付しである。Embodiment FIGS. 1 to 4 are diagrams showing an embodiment of the present invention, and parts common to the conventional example are given the same reference numerals.
同図に示すようにフランジ部２１を成形するにあたり、
角度αとして例えば４５度となるように下型としてのポ
ンチ２２に対しスライドカム９とともにセクショナルダ
イ２３を前進させ、ポンチ２２とセクショナルダイ２３
との協働によりプリフランジ部４を折曲基部１２から折
り曲げて断面略くの字状のフランジ部２１を折曲成形す
る。In forming the flange portion 21 as shown in the figure,
The sectional die 23 is advanced together with the slide cam 9 with respect to the punch 22 as a lower mold so that the angle α is 45 degrees, and the punch 22 and the sectional die 23 are moved forward.
The preflange part 4 is bent from the bending base part 12 in cooperation with the bending part 12 to form a flange part 21 having a substantially doglegged cross section.
その際、第２図〜第４図に示すようにフランジ部２１の
うち折曲基部１２に近い部分にフランジ部２１の長手方
向に沿って扁平台形状の多数のエンボス部２４を印圧成
形する。At this time, as shown in FIGS. 2 to 4, a large number of embossed portions 24 in the shape of a flat trapezoid are press-formed along the longitudinal direction of the flange portion 21 in a portion of the flange portion 21 that is close to the bent base 12. .
より詳しくは、ポンチ２２側に第１図に示すように凸状
のエンボス成形部２５を予め形成しておく一方、セクシ
ョナルダイ２３側にはエンボス成形部２５に対応する凹
状の受容部２６を形成しておくことによって、フランジ
部２１の成形末期にエンボス成形部２５と受容部２６と
が合致することでエンボス部２４が成形される。エンボ
ス部２４の大きさは第３図および第４図に示すように、
例えば板厚が０．７〜０．７５の場合には最大幅Ｑ。More specifically, as shown in FIG. 1, a convex embossed part 25 is formed in advance on the punch 22 side, while a concave receiving part 26 corresponding to the embossed part 25 is formed on the sectional die 23 side. By doing this, the embossed part 25 and the receiving part 26 match at the end of the molding of the flange part 21, so that the embossed part 24 is molded. The size of the embossed portion 24 is as shown in FIGS. 3 and 4.
For example, when the plate thickness is 0.7 to 0.75, the maximum width Q.
−１２１３１、高さｈ＝０．５ｘｍでかつ頂部平面の寸
法（ｗｘｄ）が１０１１Ｍ四方程度となるように設定し
、第２図のようにフランジ部２１の長手方向に５０Ｒ１
１ピツチで成形する。-12131, height h = 0.5xm, and the dimensions of the top plane (wxd) are set to be approximately 1011M square, and 50R1 in the longitudinal direction of the flange portion 21 as shown in Figure 2.
Form in one pitch.
この方法によると、フロントフェンダ１の一般部２の後
端部に予備成形されているプリフランジ部４そのものが
曲線に沿った曲線曲げであることから、この時点で既に
プリフランジ部４が伸びフランジ形状となっている。そ
して、プリフランジ部４を断面略くの字状のフランジ部
２１にするべく第１図のように成形すると、上記の伸び
フランジが一段と助長され、フランジ部２１には残留応
力が発生する。しかしながら、従来と異なりフランジ部
２１に多数のエンボス部２４が同時成形されるためにフ
ランジ部２１における残留応力の連続性が断ち切られ、
フランジ部の成形に伴う残留応力の一般部への影響が極
端に小さくなる。その結果として、−股部２のうちフラ
ンジ部２１に近い部分でのひずみの発生を防止できるよ
うになる。According to this method, since the pre-flange part 4 itself preformed at the rear end of the general part 2 of the front fender 1 is curved along a curve, the pre-flange part 4 has already been stretched into a flange at this point. It has a shape. When the preflange portion 4 is formed as shown in FIG. 1 to form the flange portion 21 having a generally dogleg shape in cross section, the above-mentioned stretch flange is further promoted and residual stress is generated in the flange portion 21. However, unlike in the past, a large number of embossed parts 24 are simultaneously molded on the flange part 21, so the continuity of residual stress in the flange part 21 is broken.
The influence of residual stress caused by forming the flange part on the general part becomes extremely small. As a result, it is possible to prevent strain from occurring in the portion of the crotch portion 2 that is close to the flange portion 21.
発明の効果
以上のように本発明によれば、断面略くの字状のフラン
ジ部を成形する際にこのフランジ部の長手方向に沿って
多数のエンボス部を同時成形するようにしたことにより
、フランジ部の成形に伴う残留応力の連続性がエンボス
部で断ち切られることから、−股部への残留応力の影響
を小さくでき、その結果として一般部でのひずみの発生
を防止してフロントフェンダの形状精度の向上が図れる
。Effects of the Invention As described above, according to the present invention, when molding a flange portion having a substantially doglegged cross section, a large number of embossed portions are simultaneously molded along the longitudinal direction of this flange portion. Since the continuity of residual stress caused by forming the flange part is broken at the embossed part, the influence of residual stress on the crotch part can be reduced, and as a result, distortion in the general part can be prevented and the front fender shape can be improved. Shape accuracy can be improved.
第１図は本発明の一実施例を示プレス型の断面図、第２
図は本発明方法によって成形されたフロントフェンダの
正面図、第３図はフランジ部の形状を示す図で第２図の
■−■線に沿う断面図、第４図は第３図の右側面図、第
５図は従来のフロントフェンダの正面図、第６図は第５
図のＶｌ−Ｖｌ線に沿う断面図、第７図は第６図のＡ部
拡大図、第８図は従来のフランジ成形方法を示すプレス
型の断面図である。
■・・・フロントフェンダ、２・・・−股部、４・・・
プリフランジ部、６・・・上型、９・・・スライドカム
、１２・・・折曲基部、２１・・・フランジ部、２２・
・・下型としてのポンチ、２３・・・セクショナルダイ
、２４・・・エンボス部。
第
図
第
図
第
５
図
第
図
第
図Fig. 1 is a sectional view of a press die showing one embodiment of the present invention;
The figure is a front view of a front fender formed by the method of the present invention, Figure 3 is a cross-sectional view taken along the line ■-■ in Figure 2, and Figure 4 is a diagram showing the shape of the flange part, and Figure 4 is the right side of Figure 3. Figure 5 is a front view of a conventional front fender, and Figure 6 is a front view of a conventional front fender.
7 is an enlarged view of part A in FIG. 6, and FIG. 8 is a sectional view of a press die showing a conventional flange forming method. ■...Front fender, 2...-crotch, 4...
Pre-flange part, 6... Upper die, 9... Slide cam, 12... Bent base, 21... Flange part, 22...
... Punch as a lower mold, 23 ... Sectional die, 24 ... Embossing part. Figure Figure Figure 5 Figure Figure Figure 5
Claims (1)
プレス型の下型と上型とで加圧拘束した上、予めフロン
トフェンダの一般部の後端部にほぼ直角に折曲形成され
たプリフランジ部を下型とスライドカムとの協働により
内方に折り曲げつつ略くの字状のフランジ部を成形する
方法において、下型とスライドカムとの協働によりプリ
フランジ部を一般部に対し所定の角度で折曲基部から折
り曲げて断面略くの字状のフランジ部を成形しつつ、フ
ランジ部のうち折曲基部に近い部分にフランジ部の長手
方向に沿って多数のエンボス部を成形することを特徴と
するフロントフェンダのフランジ成形方法。(1) The front fender, which has been preformed into a predetermined shape, is pressurized and restrained by the lower and upper molds of the press mold, and the preform is bent at a nearly right angle to the rear end of the general part of the front fender. In this method, a flange part is bent inward by the cooperation of a lower mold and a slide cam to form a flange part in the shape of an oval shape. While forming a flange portion having a substantially doglegged cross section by bending from the bending base at a predetermined angle, a large number of embossed portions are formed along the longitudinal direction of the flange portion in a portion of the flange portion that is close to the bending base. A front fender flange forming method characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1219377A JP2567106B2 (en) | 1989-08-25 | 1989-08-25 | Front fender flange forming method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1219377A JP2567106B2 (en) | 1989-08-25 | 1989-08-25 | Front fender flange forming method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0381021A true JPH0381021A (en) | 1991-04-05 |
| JP2567106B2 JP2567106B2 (en) | 1996-12-25 |
Family
ID=16734467
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1219377A Expired - Lifetime JP2567106B2 (en) | 1989-08-25 | 1989-08-25 | Front fender flange forming method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2567106B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11358204B2 (en) | 2018-07-03 | 2022-06-14 | Ford Motor Company | Flange forming device and method of forming a flange on a sheet metal part to reduce surface distortion |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60244430A (en) * | 1984-05-18 | 1985-12-04 | Isuzu Motors Ltd | Formation of oil pan |
| JPS63154216A (en) * | 1986-12-16 | 1988-06-27 | Toyota Motor Corp | Manufacture of long flange product |
| JPS63196314U (en) * | 1987-05-30 | 1988-12-16 |
-
1989
- 1989-08-25 JP JP1219377A patent/JP2567106B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60244430A (en) * | 1984-05-18 | 1985-12-04 | Isuzu Motors Ltd | Formation of oil pan |
| JPS63154216A (en) * | 1986-12-16 | 1988-06-27 | Toyota Motor Corp | Manufacture of long flange product |
| JPS63196314U (en) * | 1987-05-30 | 1988-12-16 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11358204B2 (en) | 2018-07-03 | 2022-06-14 | Ford Motor Company | Flange forming device and method of forming a flange on a sheet metal part to reduce surface distortion |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2567106B2 (en) | 1996-12-25 |
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