JPH0381022A - Method for forming flange for front fender - Google Patents
Method for forming flange for front fenderInfo
- Publication number
- JPH0381022A JPH0381022A JP21937989A JP21937989A JPH0381022A JP H0381022 A JPH0381022 A JP H0381022A JP 21937989 A JP21937989 A JP 21937989A JP 21937989 A JP21937989 A JP 21937989A JP H0381022 A JPH0381022 A JP H0381022A
- Authority
- JP
- Japan
- Prior art keywords
- flange
- preflange
- front fender
- bending
- general
- 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 11
- 238000005452 bending Methods 0.000 claims abstract description 12
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000000452 restraining effect Effects 0.000 description 1
Landscapes
- Bending Of Plates, Rods, And Pipes (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３図および第４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. 3 and 4, the rear end of the front fender 1 of an automobile, that is, the part facing the front end of the front door, has a diameter of 45 mm with respect to the general part 2 of the front fender 1.
The flange portion 3 having a substantially doglegged cross section is formed with an angle α of approximately 1.0 degrees.
そして、第６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Ｉの後端部にほぼ直角な
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６側のパッド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. 6, a substantially right-angled preflange portion 4 is formed at the rear end of the front fender I, which has been drawn into a predetermined three-dimensional shape in advance.
Place it on the punch 5 serving as the lower die and press the pad 7 on the upper die 6 side.
The flange portion 3 is formed by restraining the punch 5 and 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５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、プリフランジ部
の根元部から数ミリの長さの縦壁部を残した部位を折曲
基部としてプリフランジ部を一般部に対し３５〜５０度
の角度で折り曲げて断面略くの字状のフランジ部を成形
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 portion where a vertical wall portion several millimeters long is left from the root portion of the preflange portion is used as a bending base, and the preflange portion is bent by 35 mm with respect to the general portion. It is characterized by being bent at an angle of ~50 degrees to form a flange portion having a substantially doglegged cross section.
プリ７ランジ部の根元部から折曲基部までの縦壁部の寸
法としては板厚の４倍程度が望ましく、また−股部に対
するフランジ部のより望ましい角度としては４０度とす
る。The dimension of the vertical wall from the root of the pre-7 flange to the bent base is preferably about four times the thickness of the plate, and a more desirable angle of the flange with respect to the crotch is 40 degrees.
作用
上記の方法によると、フランジ部の成形に伴う残留応力
の一般部への影響が、−股部とフランジ部との間に存在
する縦壁部で断ち切られるために一般部での「だれ」と
称されるひずみの発生がなくなる。Effect: According to the method described above, the influence of the residual stress caused by forming the flange part on the general part is cut off by the vertical wall part that exists between the crotch part and the flange part, so that there is no "sag" in the general part. This eliminates the occurrence of distortion.
実施例
第１図および第２図は本発明の一実施例を示す図で、第
４図および第６図と共通する部分には同一符号を付しで
ある。Embodiment FIGS. 1 and 2 are diagrams showing an embodiment of the present invention, and parts common to FIGS. 4 and 6 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、
プリフランジ部２２の根元部２３から数ミリの縦壁部２
４を残した位置を折曲基部２５とし、角度α１として３
５〜５０度の方向からセクショナルダイ２６を進入させ
て、下型としてのポンチ２７とセクショナルダイ２６と
の協働により断面略くの字状のフランジ部２１を成形す
る。２８はセクショナルダイ２６が取り付けられたスラ
イドカム、２９はドライブカムである。In forming the flange portion 21 as shown in the figure,
Vertical wall portion 2 several millimeters from the root portion 23 of the pre-flange portion 22
The position where 4 is left is the bending base 25, and the angle α1 is 3.
The sectional die 26 is advanced from a direction of 5 to 50 degrees, and the flange portion 21 having a substantially doglegged cross section is formed by the cooperation of the punch 27 as a lower mold and the sectional die 26. 28 is a slide cam to which the sectional die 26 is attached, and 29 is a drive cam.
縦壁部２４の長さｅとしては板厚の４倍程度、例えば板
厚ｔ＝０．７〜０．７５の場合には１２＝３ｎ程度に設
定する。また、角度α、としてフランジ部２１の本来の
機能の上で許容される角度は３５〜５０度であるが、縦
壁部２４の寸法ｇとの兼ね合いの上では４０度が最も望
ましい。The length e of the vertical wall portion 24 is set to about four times the plate thickness, for example, when the plate thickness t=0.7 to 0.75, it is set to about 12=3n. Further, the allowable angle α for the original function of the flange portion 21 is 35 to 50 degrees, but 40 degrees is most desirable in consideration of the dimension g of the vertical wall portion 24.
この方法によると、フロントフェンダｌ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２２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２２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２２を断面くの字状のフラン
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、従来と異なり一般部
２とフランジ部２１との間に縦壁部２４が存在するため
に、残留応力が一般部２に及ぼす影響が縦壁部２４で断
ち切られ、−股部２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 22 itself preformed at the rear end of the general part 2 of the front fender l is curved along a curve, the pre-flange part 22 has already been stretched into a flange at this point. It has a shape. When the preflange part 22 is formed as shown in FIG. 1 to form the flange part 21 having a dogleg shape in cross section, the above-mentioned stretch flange is further promoted and residual stress is generated in the flange part 21. However, unlike in the past, since the vertical wall portion 24 exists between the general portion 2 and the flange portion 21, the influence of residual stress on the general portion 2 is cut off by the vertical wall portion 24, and the - crotch portion 2 It becomes possible to prevent the occurrence of distortion.
発明の効果
以上のように本発明によれば、プリフランジ部の根元部
から数ミリの縦壁部を残した部位を折曲基部としてプリ
フランジ部を一般部に対して３５〜５０度の角度で折り
曲げて断面略くの字状のフランジ部を成形するようにし
たことにより、フランジ部の成形に伴う残留応力の一般
部への影響が縦壁部で断ち切られることから、−股部で
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, the preflange portion is bent at an angle of 35 to 50 degrees with respect to the general portion, with the portion where a vertical wall portion of several millimeters is left remaining from the root portion of the preflange portion as the bending base. By bending the flange part at the crotch part to form the flange part, which has a dogleg-shaped cross section, the influence of the residual stress on the general part due to the forming of the flange part is cut off at the vertical wall part. This prevents distortion and improves the shape accuracy of the front fender.
【図面の簡単な説明】
第１図は本発明の一実施例を示プレス型の断面図、第２
図はフランジ部の断面図、第３図はフロントフェンダの
正面図、第４図は従来のフランジ部の形状を示す図で第
３図のＩＩＶ−ＩＶ線に沿う断面図、第５図は第４図の
Ａ部拡大図、第６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、６・・・
上型、２１・・・フランジ部、２２・・・プリフランジ
部、２３・・・根元部、２４・・・縦壁部、２５・・・
折曲基部、２６・・・セクショナルダイ、２７・・・下
型としてのポンチ、２８・・・スライドカム。
第
３
図
第
図
第
図
第
図[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a sectional view of a press die showing one embodiment of the present invention;
The figure is a sectional view of the flange part, Figure 3 is a front view of the front fender, Figure 4 is a diagram showing the shape of a conventional flange part and is a sectional view taken along line IIV-IV in Figure 3, and Figure 5 is a front view of the front fender. FIG. 4 is an enlarged view of part A, and FIG. 6 is a sectional view of a press die showing a conventional flange forming method. ■...Front fender, 2...-crotch, 6...
Upper mold, 21... Flange part, 22... Preflange part, 23... Root part, 24... Vertical wall part, 25...
Bending base, 26... Sectional die, 27... Punch as a lower die, 28... Slide cam. Figure 3 Figure 3 Figure 3
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、プリフランジ部の根元部から数ミリの長
さの縦壁部を残した部位を折曲基部としてプリフランジ
部を一般部に対し３５〜５０度の角度で折り曲げて断面
略くの字状のフランジ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, the flange is bent inward by the cooperation of a lower die and a slide cam to form a dogleg-shaped flange, leaving a vertical wall several millimeters long from the root of the pre-flange. A method of forming a flange for a front fender, characterized in that a preflange portion is bent at an angle of 35 to 50 degrees with respect to a general portion using the bent portion as a bending base to form a flange portion having a substantially doglegged cross section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1219379A JP2533650B2 (en) | 1989-08-25 | 1989-08-25 | Front fender flange forming method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1219379A JP2533650B2 (en) | 1989-08-25 | 1989-08-25 | Front fender flange forming method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0381022A true JPH0381022A (en) | 1991-04-05 |
| JP2533650B2 JP2533650B2 (en) | 1996-09-11 |
Family
ID=16734498
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1219379A Expired - Fee Related JP2533650B2 (en) | 1989-08-25 | 1989-08-25 | Front fender flange forming method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2533650B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100101297A1 (en) * | 2006-12-19 | 2010-04-29 | Gm Global Technology Operations, Inc. | Folding device and method for the folding of workpieces |
| ES2454042R1 (en) * | 2012-10-08 | 2014-05-08 | Seat, S.A. | PROCEDURE FOR CONFORMING PEAKS IN EMBUTIDAS DE CHAPA PARTS. |
| US8864117B2 (en) | 2010-05-14 | 2014-10-21 | Nhk Spring Co., Ltd. | Fiber-reinforced plastic spring |
| CN104438529A (en) * | 2015-01-04 | 2015-03-25 | 无锡锡锻机床有限公司 | Automatic compound movement type edge folding mechanism |
| CN105562529A (en) * | 2016-01-27 | 2016-05-11 | 太仓旺美模具有限公司 | Vehicle skylight side inclined surface punching mold |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63196314U (en) * | 1987-05-30 | 1988-12-16 |
-
1989
- 1989-08-25 JP JP1219379A patent/JP2533650B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63196314U (en) * | 1987-05-30 | 1988-12-16 |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100101297A1 (en) * | 2006-12-19 | 2010-04-29 | Gm Global Technology Operations, Inc. | Folding device and method for the folding of workpieces |
| US8375763B2 (en) * | 2006-12-19 | 2013-02-19 | GM Global Technology Operations LLC | Folding device and method for the folding of workpieces |
| US8864117B2 (en) | 2010-05-14 | 2014-10-21 | Nhk Spring Co., Ltd. | Fiber-reinforced plastic spring |
| ES2454042R1 (en) * | 2012-10-08 | 2014-05-08 | Seat, S.A. | PROCEDURE FOR CONFORMING PEAKS IN EMBUTIDAS DE CHAPA PARTS. |
| CN104438529A (en) * | 2015-01-04 | 2015-03-25 | 无锡锡锻机床有限公司 | Automatic compound movement type edge folding mechanism |
| CN105562529A (en) * | 2016-01-27 | 2016-05-11 | 太仓旺美模具有限公司 | Vehicle skylight side inclined surface punching mold |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2533650B2 (en) | 1996-09-11 |
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