JP2002120026A - Method for forming decorative hole of disk for car wheel - Google Patents
Method for forming decorative hole of disk for car wheelInfo
- Publication number
- JP2002120026A JP2002120026A JP2000317100A JP2000317100A JP2002120026A JP 2002120026 A JP2002120026 A JP 2002120026A JP 2000317100 A JP2000317100 A JP 2000317100A JP 2000317100 A JP2000317100 A JP 2000317100A JP 2002120026 A JP2002120026 A JP 2002120026A
- Authority
- JP
- Japan
- Prior art keywords
- decorative hole
- hole
- forming
- decorative
- fracture surface
- 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
Landscapes
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、自動車ホイール用
ディスクの飾り穴の形成方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a decorative hole in a disk for an automobile wheel.
【０００２】[0002]
【従来の技術】自動車ホイール用ディスク１は、図５、
図６に示すように、意匠性の向上、または軽量化、ある
いは冷却性を向上させるために、乗用車、バス、トラッ
クを問わず、ディスク１の意匠面の周方向にいくつかの
飾り穴２が形成されている。通常、この飾り穴２の形成
は、所定の形状をした打ち抜きパンチで打ち抜く方法に
よってなされていた。しかし、パンチで打ち抜いたまま
の状態では、図７に示すように、飾り穴２の破断面がギ
ザギザになっていること、飾り穴２が応力が集中しやす
く強度上の最弱部位になったいるため、とくに飾り穴２
の角部近傍２ａ、２ｂ（図５）から亀裂Ｃが生じること
が多く、その対策として次の方法が取られてきた。 飾り穴エッジ部をコイニングすることによって圧縮残
留応力を付加し、疲労強度を向上させるとともに、エッ
ジ部のマイクロクラックを除去し、切欠感受性による影
響を排除する。 飾り穴形状または、飾り穴面積の変更により剛性をア
ップする。 素材板厚のアップにより剛性と疲労強度を向上する。 高張力鋼使用により疲労強度を向上する。 ショットピーニングにより疲労強度を向上する。2. Description of the Related Art FIG.
As shown in FIG. 6, several decorative holes 2 are provided in the circumferential direction of the design surface of the disc 1 irrespective of a passenger car, a bus, or a truck in order to improve the design, reduce the weight, or improve the cooling performance. Is formed. Usually, the decorative holes 2 are formed by a method of punching with a punch having a predetermined shape. However, as shown in FIG. 7, in the state where punching was performed with the punch, the broken surface of the decorative hole 2 was jagged, and the decorative hole 2 became the weakest part in strength because stress was easily concentrated. Because it is a decorative hole 2
Cracks often occur from the corners 2a and 2b (FIG. 5) near the corners, and the following method has been adopted as a countermeasure. By coining the decorative hole edge, a compressive residual stress is added to improve the fatigue strength, and microcracks on the edge are removed, thereby eliminating the influence of notch sensitivity. Increase the rigidity by changing the decoration hole shape or decoration hole area. The rigidity and fatigue strength are improved by increasing the material thickness. Improves fatigue strength by using high tensile steel. Improves fatigue strength by shot peening.
【０００３】[0003]
【発明が解決しようとする課題】しかし、従来の方法に
は次の問題があった。 エッジ部をコイニングする方法では、効果が得られ
るのはコイニングされたエッジ部のみであり、破断面か
らの亀裂に対しては効果が得られない。 飾り穴の形状や面積を変更する方法ではデザイン性
が低下したり、ブレーキ冷却性能が低下する。 素材板厚のアップでの対応は、コストアップととも
に、重量増加による車両性能の悪化が生じる。 抗張力鋼の使用は、コストアップになるとともに切
欠感受性が低下する。 ショットピーニング法はコストアップとともに必要
とする部位は効果が少ない。 本発明の目的は、意匠性の低下なしに、また、コストア
ップなしに、その強度を向上させた自動車ホイール用デ
ィスクの飾り穴形成方法を提供することにある。However, the conventional method has the following problems. In the method of coining the edge portion, the effect is obtained only at the coined edge portion, and the effect is not obtained with respect to the crack from the fractured surface. The method of changing the shape and area of the decorative hole deteriorates design and brake cooling performance. If the thickness of the material is increased, the cost will increase and the vehicle performance will deteriorate due to the increase in weight. The use of high-strength steel increases costs and reduces notch sensitivity. The shot peening method has little effect on the parts required as the cost increases. SUMMARY OF THE INVENTION An object of the present invention is to provide a method for forming a decorative hole of a disc for an automobile wheel, the strength of which is improved without lowering the designability and without increasing the cost.
【０００４】[0004]
【課題を解決するための手段】上記目的を達成するため
の本発明は次の通りである。 （１） 自動車ホイール用ディスクの飾り穴の形成方法
において、最終飾り穴径よりもやや小径に穴を打ち抜
く、飾り穴予加工工程と、前記予加工された飾り穴のせ
ん断面、破断面を、しごきパンチとダイにより、しごく
ことにより、前記飾り穴予加工工程により発生した破断
面のマイクロクラックを押しつぶし、せん断面、破断面
を、圧縮残留応力を付加して平滑強化する工程とを、順
に行うことを特徴とする自動車ホイール用ディスクの飾
り穴形成方法。 （２） 自動車ホイール用ディスクの飾り穴の形成方法
において、飾り穴のコーナー部近傍の応力集中部位に、
最終飾り穴形状よりも内側に張り出させた張り出し部を
形成するように打抜く予加工工程と、前記予加工した飾
り穴の張り出し部を、パンチとダイによってしごくこと
により、しごき加工によって前記応力集中部位に余肉を
生じさせ、板厚を部分的に厚肉化して厚肉部を形成する
工程とを、順に行うことを特徴とする自動車ホイール用
ディスクの飾り穴形成方法。 （３） 自動車ホイール用ディスクの飾り穴の形成方法
において、飾り穴のコーナー部近傍の応力集中部位に、
最終飾り穴形状よりも内側に張り出させた、張り出し部
を形成するように、また、その他の飾り穴部位は、最終
飾り穴径よりもやや小径の形状に打抜く、飾り穴予加工
工程と、前記予加工工程の後に、最終飾り穴寸法のパン
チとダイによりしごくことによって、前記応力集中部位
に余肉を生じさせ、板厚を部分的に厚肉化して厚肉部を
形成するとともに、その他の予加工された飾り穴のせん
断面、破断面は、前記飾り穴予加工工程により発生した
破断面のマイクロクラックを押しつぶし、せん断面、破
断面を、圧縮残留応力を付加して平滑強化する工程と
を、順に行うことを特徴とする自動車ホイール用ディス
クの飾り穴形成方法。The present invention for achieving the above object is as follows. (1) In a method for forming a decorative hole of a disc for an automobile wheel, a decorative hole pre-processing step of punching a hole slightly smaller than the final decorative hole diameter, and a shearing surface and a fracture surface of the pre-processed decorative hole, The steps of crushing the micro-cracks of the fracture surface generated in the decorative hole pre-processing step by ironing with an ironing punch and a die, and strengthening the shear surface and the fracture surface by applying compressive residual stress are sequentially performed. A method for forming a decorative hole in a disc for an automobile wheel. (2) In the method of forming a decorative hole of an automobile wheel disc, the stress concentration portion near the corner of the decorative hole is
A pre-machining step of punching out to form an overhang protruding inward from the shape of the final ornament hole, and by punching the overhang of the pre-machined ornament hole with a punch and a die, the stress is reduced by ironing. A step of forming a thick part by increasing the thickness of the plate by partially increasing the thickness of the concentrated portion, thereby sequentially forming a thick hole portion. (3) In the method of forming a decorative hole of a disc for an automobile wheel, the stress concentration portion near the corner of the decorative hole is
In order to form an overhang, which protrudes inward from the final decorative hole shape, and to punch other decorative hole parts into a slightly smaller diameter than the final decorative hole diameter, a decorative hole pre-processing step After the pre-processing step, by punching with a punch and a die having a final decorative hole dimension, an excess thickness is generated in the stress concentration portion, and the thickness is partially increased to form a thick portion, The shear surface and fracture surface of the other pre-processed decorative holes crush the micro cracks of the fracture surface generated in the decorative hole pre-processing step, and add a compressive residual stress to the shear surface and the fracture surface to strengthen smoothly. And a step of sequentially performing the steps.
【０００５】上記（１）の自動車ホイール用ディスクの
飾り穴形成方法では、最終飾り穴径よりもやや小径に穴
を打ち抜く、飾り穴予加工工程と、予加工された飾り穴
のせん断面、破断面を、しごきパンチとダイにより、し
ごくことにより、飾り穴予加工工程により発生した破断
面のマイクロクラックを押しつぶし、せん断面、破断面
を、圧縮残留応力を付加して平滑強化できるので、意匠
性の向上と、疲労強度を向上させた自動ホイール用ディ
スクを低価格で提供できる。上記（２）の自動車ホイー
ル用ディスクの飾り穴形成方法では、飾り穴のコーナー
部近傍の応力集中部位に、最終飾り穴形状よりも内側に
張り出させた張り出し部を形成するように打抜く予加工
工程と、予加工した飾り穴の張り出し部を、パンチとダ
イによってしごくことにより、しごき加工によって応力
集中部位に余肉を生じさせ、板厚を部分的に厚肉化する
工程とを、順に行うことによって、疲労強度を向上させ
た、自動車ホイール用ディスクを低価格で提供できる。
上記（３）の自動車ホイール用ディスクの飾り穴形成方
法では、飾り穴のコーナー部近傍の応力集中部位に、最
終飾り穴形状よりも内側に張り出させた、張り出し部を
形成するように、また、その他の飾り穴部位は、最終飾
り穴径よりもやや小径の形状に打抜く飾り穴予加工工程
と、予加工工程の後に、最終飾り穴寸法のパンチとダイ
によりしごき加工を順に行うので、意匠性を向上させな
がら、疲労強度も向上させた自動車ホイール用ディスク
を低価格で提供できる。In the method (1) for forming a decorative hole of a disc for an automobile wheel, a hole is punched out to a diameter slightly smaller than the final decorative hole diameter, a decorative hole pre-processing step, and a shearing surface and breakage of the pre-processed decorative hole. By squeezing the cross section with an ironing punch and die, it can crush the micro cracks of the fracture surface generated in the decorative hole pre-processing process, and the shear surface and the fracture surface can be strengthened smoothly by adding compressive residual stress, so design And a disk for an automatic wheel with improved fatigue strength and improved fatigue strength can be provided at a low price. In the method for forming a decorative hole of an automobile wheel disc according to the above (2), punching is performed so as to form a projecting portion projecting inward from the final decorative hole shape at a stress concentration site near a corner of the decorative hole. The processing step and the step of making the overhang of the pre-processed decorative hole with a punch and a die to generate extra thickness at the stress concentration site by ironing and to partially increase the thickness of the plate, in order By doing so, it is possible to provide an automobile wheel disc with improved fatigue strength at a low price.
In the method for forming a decorative hole of an automobile wheel disc according to the above (3), a protruding portion that protrudes inward from the final decorative hole shape is formed at a stress concentration portion near a corner of the decorative hole, and , And other decorative hole parts, the decorative hole pre-processing step to punch out a slightly smaller diameter than the final decorative hole diameter, and after the pre-processing step, ironing is performed in order by punch and die of the final decorative hole size, It is possible to provide an inexpensive automobile wheel disc having improved design and improved fatigue strength.
【０００６】[0006]
【発明の実施の形態】以下に、本発明実施例の自動車ホ
イール用ディスクの飾り穴形成方法を図１〜図４を参照
して説明する。尚、従来（図５〜図７）と同一部分には
従来と同じ符号をつけて説明する。図１は、本発明の第
１実施例の自動車ホイール用ディスクの飾り穴形成方法
の工程を示しており、図中、工程（Ａ）では、ディスク
１に最終形状の飾り穴２よりもやや小径の飾り穴を打抜
く、予加工を行った後の、飾り穴２の断面状態を示して
いる。飾り穴２の最終平面形状は、図２に、一点鎖線で
表示している。予加工の形状はそれよりもやや内側に径
小で形成され、実線で示してある。予加工された飾り穴
２の切断面は、比較的滑らかな、せん断面２ｃと、これ
に続くギザギザの表面にマイクロクラックが生じている
破断面２ｄと、からなっている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for forming a decorative hole in a vehicle wheel disc according to an embodiment of the present invention will be described below with reference to FIGS. The same parts as those in the related art (FIGS. 5 to 7) will be described with the same reference numerals. FIG. 1 shows the steps of a method for forming a decorative hole of a vehicle wheel disk according to a first embodiment of the present invention. In the drawing, in step (A), the disk 1 has a slightly smaller diameter than the final shape decorative hole 2. 4 shows a cross-sectional state of the decorative hole 2 after punching out the decorative hole 2 and performing pre-processing. The final planar shape of the decorative hole 2 is indicated by a dashed line in FIG. The shape of the pre-machining is formed slightly smaller inside and is indicated by a solid line. The cut surface of the pre-processed decorative hole 2 is composed of a relatively smooth shear surface 2c and a fracture surface 2d having a micro-crack formed on a jagged surface following the shear surface 2c.
【０００７】工程（Ｂ）では、しごきパンチ１０、ダイ
１２間にディスク１が配置される。工程（Ｃ）では、実
際にせん断面２ｃ、破断面２ｄがしごかれる。工程
（Ｄ）では、しごき加工した後の、せん断面２ｃ、破断
面２ｄの状態を示しており、圧縮残留応力が付与されて
表面が強化されると同時に、破断面２ｄのマイクロクラ
ックが押しつぶされ、せん断面２ｃ、破断面２ｄは表面
が滑らかになる。この方法によって、破断面２ｄのギザ
ギザやマイクロクラックが無くなり、意匠性が向上され
るとともに、ディスクの強度が向上される。In the step (B), the disc 1 is placed between the ironing punch 10 and the die 12. In the step (C), the shear surface 2c and the fracture surface 2d are actually wrung. In the step (D), the state of the sheared surface 2c and the fracture surface 2d after the ironing is shown. At the same time, the compressive residual stress is applied to strengthen the surface, and at the same time, the micro cracks in the fracture surface 2d are crushed. , The shear surface 2c and the fracture surface 2d have smooth surfaces. By this method, jaggies and microcracks in the fractured surface 2d are eliminated, the design is improved, and the strength of the disk is improved.
【０００８】図４は本発明の第２実施例の自動車ホイー
ル用ディスクの飾り穴形成方法を工程順に示している。
工程（Ａ）では、図３に示すように、飾り穴２の径は、
少なくとも応力が発生しやすい部位については、正規の
径よりも、やや小さい寸法にパンチとダイにより打抜く
予加工が行われる。予加工では、実線で示したように、
最終形状よりも、部分的にやや内側に径小となるよう
に、張り出し部２ｅが形成される。予加工された飾り穴
２の切断面は、第一実施例と同じように、比較的滑らか
な、せん断面２ｃと、これに続くギザギザの表面にマイ
クロクラックが生じている破断面２ｄと、からなってい
る。FIG. 4 shows a method of forming a decorative hole in a disk for an automobile wheel according to a second embodiment of the present invention in the order of steps.
In the step (A), as shown in FIG.
At least for a portion where stress is likely to be generated, preliminary processing is performed by punching with a punch and a die to a size slightly smaller than a regular diameter. In pre-machining, as shown by the solid line,
The overhang portion 2e is formed so as to have a diameter slightly smaller inward than the final shape. As in the first embodiment, the cut surface of the pre-processed decorative hole 2 is composed of a relatively smooth, sheared surface 2c and a fracture surface 2d in which microcracks are formed on the jagged surface. Has become.
【０００９】工程（Ｂ）では、しごきパンチ１０、ダイ
１２間にディスク１が配置される。工程（Ｃ）では、図
３に示した飾り穴２の予加工された状態の、応力が発生
しやすいい部位に、正規の飾り穴２の形状よりも内側に
やや径小となるように張り出し部２ｅを形成し、この張
り出し部２ｅが形成された部分を、パンチ１０とダイ１
２により、しごく。このしごき加工によって、内側に径
小となった張り出し部２ｅは、余肉となって裏面に移動
させられることにより部分的に厚肉部１４を形成する。
この工程（Ｃ）によって、工程（Ｄ）（ダイとパンチか
らディスクを外した状態）では、応力集中部位が厚肉部
１４となり、元板厚ｔよりも部分的に厚いＴとなる。こ
の結果、ディスク１の板厚全体を厚くすることなく部分
的に応力集中部位だけを厚肉部１４とすることにより、
ディスク１の疲労強度の向上を図ることができる。In the step (B), the disk 1 is placed between the ironing punch 10 and the die 12. In the step (C), in the pre-processed state of the decorative hole 2 shown in FIG. A part 2e is formed, and the part where the overhang part 2e is formed is
By 2, it is severe. Due to this ironing, the overhanging portion 2e, which has a small diameter on the inside, becomes a surplus and is moved to the back surface to partially form the thick portion 14.
In the step (C), in the step (D) (in a state where the disk is removed from the die and the punch), the stress concentration portion becomes the thick portion 14 and becomes T which is partially thicker than the original plate thickness t. As a result, the thick portion 14 is formed only partially at the portion where the stress is concentrated without increasing the thickness of the disk 1.
The fatigue strength of the disk 1 can be improved.
【００１０】本発明の第３実施例は、特に図示しない
が、第１実施例と、第２実施例を併せて行う方法であ
る。すなわち、飾り穴２の予加工では、飾り穴２の応力
集中部位は、その後のしごき加工によって余肉が生じる
程度に内側に径小となるように張り出し部２ｅを形成
し、その他の部位は、しごき加工によって、破断面２ｄ
に生ずるマイクロクラックが押し潰される程度に径小に
形成しておき、その次の工程で、しごきパンチ１０とダ
イ１２によってしごき加工を行う。この方法によれば、
破断面２ｄのマイクロクラックが押し潰され、飾り穴２
のせん断面２ｃと破断面２ｄは、圧縮残留応力付加によ
る強度向上と、切断面が滑らかになるため、意匠性が向
上する。これに加えて、応力集中部位の板厚を部分的に
厚くする厚肉部を形成できるため、さらにディスク１の
疲労強度を向上させることができる。Although not shown, the third embodiment of the present invention is a method in which the first embodiment and the second embodiment are combined. That is, in the pre-machining of the decorative hole 2, the stress concentration portion of the decorative hole 2 forms the overhang portion 2e so as to have a small diameter inward to the extent that excess iron is generated by subsequent ironing, and the other portions are 2d fracture surface by ironing
Is formed so as to be small enough to crush the microcracks generated in the above, and in the next step, ironing is performed by the ironing punch 10 and the die 12. According to this method,
The micro cracks of the fracture surface 2d are crushed and the decorative holes 2
The shear surface 2c and the fracture surface 2d have improved strength due to the application of compressive residual stress and a smooth cut surface, so that the design is improved. In addition to this, a thick portion that partially increases the thickness of the stress concentration portion can be formed, so that the fatigue strength of the disk 1 can be further improved.
【００１１】[0011]
【発明の効果】請求項１の自動車ホイール用ディスクの
飾り穴形成方法によれば、最終飾り穴径よりもやや小径
に穴を打ち抜く、飾り穴予加工工程と、予加工された飾
り穴のせん断面、破断面を、しごきパンチとダイによ
り、しごくことにより、飾り穴予加工工程により発生し
た破断面のマイクロクラックを押しつぶし、せん断面、
破断面を、圧縮残留応力を付加して平滑強化するので、
意匠性の向上と、疲労強度を向上させた自動ホイール用
ディスクを低価格で提供できる。請求項２の自動車ホイ
ール用ディスクの飾り穴形成方法によれば、飾り穴のコ
ーナー部近傍の応力集中部位に、最終飾り穴形状よりも
内側に張り出させた張り出し部を形成するように打抜く
予加工工程と、予加工した飾り穴の張り出し部を、パン
チとダイによってしごくことにより、しごき加工によっ
て応力集中部位に余肉を生じさせ、板厚を部分的に厚肉
化する工程とを、順に行うことによって、疲労強度を向
上させた、自動車ホイール用ディスクを低価格で提供で
きる。請求項３の自動車ホイール用ディスクの飾り穴形
成方法によれば、飾り穴のコーナー部近傍の応力集中部
位に、最終飾り穴形状よりも内側に張り出させた、張り
出し部を形成するように、また、その他の飾り穴部位
は、最終飾り穴径よりもやや小径の形状に打抜く飾り穴
予加工工程を行い、予加工工程の後に、最終飾り穴寸法
のパンチとダイによりしごき加工により、応力集中部に
は厚肉部、その他の部位は、せん断面、破断面に圧縮残
留応力を付加し、せん断面破断面を滑らかにする工程を
行うので、意匠性を向上させながら、疲労強度も向上さ
せた自動車ホイール用ディスクを低価格で提供できる。According to the method for forming a decorative hole of an automobile wheel disc according to the first aspect, a decorative hole pre-machining step of punching a hole slightly smaller than the final decorative hole diameter is provided. By squeezing the cross section and fracture surface with an ironing punch and die, the micro cracks of the fracture surface generated in the decorative hole pre-processing process are crushed,
Since the fracture surface is strengthened smoothly by adding compressive residual stress,
A disc for an automatic wheel with improved design and improved fatigue strength can be provided at a low price. According to the method for forming a decorative hole of a vehicle wheel disk according to the second aspect, a punching is performed so as to form a projecting portion projecting inward from the final decorative hole shape at a stress concentration portion near a corner of the decorative hole. A pre-processing step and a step in which the overhang of the pre-processed decorative hole is punched with a punch and a die to generate extra thickness at the stress concentration portion by ironing, and to partially increase the thickness of the plate, By performing the steps in order, it is possible to provide an automobile wheel disc with improved fatigue strength at a low price. According to the method for forming a decorative hole of an automobile wheel disc according to claim 3, an overhang portion is formed at a stress concentration portion near a corner portion of the decorative hole so as to project inward from the final decorative hole shape. In addition, for other decorative hole parts, perform a decorative hole pre-processing step of punching out a shape slightly smaller than the final decorative hole diameter, and after the pre-processing step, press the iron with a punch and die of the final decorative hole size to reduce stress. The thick part in the concentrated part and the other parts apply a compressive residual stress to the shear surface and fracture surface, and perform the process of smoothing the fracture surface of the shear surface, so the fatigue strength is improved while improving the designability It is possible to provide an inexpensive automobile wheel disc.
【図１】本発明の第１実施例の自動車ホイール用ディス
クの飾り穴形成方法を示す工程図である。FIG. 1 is a process diagram showing a method for forming a decorative hole in a disk for an automobile wheel according to a first embodiment of the present invention.
【図２】本発明の第１実施例の自動車ホイール用ディス
クの飾り穴形成方法の飾り穴予加工時の飾り穴形状を示
す断面図および部分平面図である。FIGS. 2A and 2B are a sectional view and a partial plan view showing a decorative hole shape at the time of decorative hole pre-processing of a decorative hole forming method for a vehicle wheel disk according to a first embodiment of the present invention.
【図３】本発明の第２実施例の自動車ホイール用ディス
クの飾り穴形成方法の飾り穴予加工時の飾り穴形状を示
す断面図および部分平面図である。3A and 3B are a sectional view and a partial plan view showing a decorative hole shape at the time of decorative hole pre-processing of a decorative hole forming method for a vehicle wheel disk according to a second embodiment of the present invention.
【図４】本発明の第２実施例の自動車ホイール用ディス
クの飾り穴形成方法を示す工程図である。FIG. 4 is a process diagram showing a method for forming a decorative hole in a disk for an automobile wheel according to a second embodiment of the present invention.
【図５】本発明および従来の飾り穴の基本形状と応力集
中部位を示す部分平面図である。FIG. 5 is a partial plan view showing a basic shape of a decorative hole of the present invention and a conventional decorative hole and a stress concentration portion.
【図６】本発明および従来の飾り穴部の断面図である。FIG. 6 is a cross-sectional view of the present invention and a conventional decorative hole.
【図７】図６の飾り穴打抜き加工後のせん断面、破断面
を示す部分拡大図である。FIG. 7 is a partially enlarged view showing a sheared surface and a fractured surface after the decorative hole punching process of FIG. 6;
１ ディスク ２ 飾り穴 ２a 、２ｂ 応力集中部位 ２ｃ せん断面 ２ｄ 破断面 ２ｅ 張り出し部 １０ しごきパンチ １２ しごきダイ １４ 厚肉部 DESCRIPTION OF SYMBOLS 1 Disc 2 Decorative hole 2a, 2b Stress concentration part 2c Shear surface 2d Fracture surface 2e Overhanging part 10 Ironing punch 12 Ironing die 14 Thick part
Claims (3)
成方法において、 最終飾り穴径よりもやや小径に穴を打ち抜く、飾り穴予
加工工程と、 前記予加工された飾り穴のせん断面、破断面を、しごき
パンチとダイにより、しごくことにより、前記飾り穴予
加工工程により発生した破断面のマイクロクラックを押
しつぶし、せん断面、破断面を、圧縮残留応力を付加し
て平滑強化する工程とを、順に行うことを特徴とする自
動車ホイール用ディスクの飾り穴形成方法。1. A method for forming a decorative hole of a vehicle wheel disc, comprising: a decorative hole pre-processing step of punching a hole slightly smaller than the final decorative hole diameter; and a shearing surface and a fracture surface of the pre-processed decorative hole. By ironing punch and die, by squeezing, crushing the micro cracks of the fracture surface generated in the decorative hole pre-processing step, shearing surface, the step of smoothening the fracture surface by applying compressive residual stress, A method for forming a decorative hole in a disc for an automobile wheel, which is performed in order.
成方法において、 飾り穴のコーナー部近傍の応力集中部位に、最終飾り穴
形状よりも内側に張り出させた張り出し部を形成するよ
うに打抜く予加工工程と、 前記予加工した飾り穴の張り出し部を、パンチとダイに
よってしごくことにより、しごき加工によって前記応力
集中部位に余肉を生じさせ、板厚を部分的に厚肉化して
厚肉部を形成する工程とを、順に行うことを特徴とする
自動車ホイール用ディスクの飾り穴形成方法。2. A method for forming a decorative hole in a vehicle wheel disc, wherein a punched portion is formed at a stress concentration portion near a corner portion of the decorative hole so as to form an overhanging portion protruding inward from the final decorative hole shape. A pre-processing step, by punching the protruding portion of the pre-processed decorative hole with a punch and a die, thereby generating extra thickness in the stress concentration portion by ironing, and partially increasing the thickness of the plate to increase the thickness. And a step of forming a portion in order, the decorative hole forming method for a disc for a vehicle wheel.
成方法において、飾り穴のコーナー部近傍の応力集中部
位に、最終飾り穴形状よりも内側に張り出させた、張り
出し部を形成するように、また、その他の飾り穴部位
は、最終飾り穴径よりもやや小径の形状に打抜く、飾り
穴予加工工程と、 前記予加工工程の後に、最終飾り穴寸法のパンチとダイ
によりしごくことによって、前記応力集中部位に余肉を
生じさせ、板厚を部分的に厚肉化して厚肉部を形成する
とともに、その他の予加工された飾り穴のせん断面、破
断面は、前記飾り穴予加工工程により発生した破断面の
マイクロクラックを押しつぶし、せん断面、破断面を、
圧縮残留応力を付加して平滑強化する工程とを、順に行
うことを特徴とする自動車ホイール用ディスクの飾り穴
形成方法。3. A method for forming a decorative hole of a disc for an automobile wheel, wherein a projecting portion is formed at a stress concentration portion near a corner of the decorative hole so as to project inward from the final decorative hole shape. In addition, the other decorative hole parts are punched into a shape slightly smaller than the final decorative hole diameter, a decorative hole pre-processing step, and after the pre-processing step, by punching with a final decorative hole dimension punch and die, The excess thickness is generated in the stress concentration portion, the thickness of the plate is partially increased to form a thick portion, and the shear surface and the fracture surface of the other pre-processed decorative holes are formed by the decorative hole pre-processing. Crush the micro cracks of the fracture surface generated by the process,
Applying a compressive residual stress to enhance the smoothness in order.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000317100A JP4233207B2 (en) | 2000-10-17 | 2000-10-17 | Method for forming decorative hole in disc for automobile wheel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000317100A JP4233207B2 (en) | 2000-10-17 | 2000-10-17 | Method for forming decorative hole in disc for automobile wheel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002120026A true JP2002120026A (en) | 2002-04-23 |
| JP4233207B2 JP4233207B2 (en) | 2009-03-04 |
Family
ID=18795947
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000317100A Expired - Lifetime JP4233207B2 (en) | 2000-10-17 | 2000-10-17 | Method for forming decorative hole in disc for automobile wheel |
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| Country | Link |
|---|---|
| JP (1) | JP4233207B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006125521A (en) * | 2004-10-28 | 2006-05-18 | Sekisui Chem Co Ltd | Bell-and-spigot joint |
| WO2006057383A1 (en) * | 2004-11-29 | 2006-06-01 | The Yokohama Rubber Co., Ltd. | Run-flat supporting body and tire/wheel assembly |
| JP2007333079A (en) * | 2006-06-15 | 2007-12-27 | Ntn Corp | Thrust roller bearing |
| US7896558B2 (en) | 2006-06-06 | 2011-03-01 | Ntn Corporation | Thrust roller bearing |
| JP2015006849A (en) * | 2013-06-25 | 2015-01-15 | トピー工業株式会社 | Vehicle wheel and manufacturing method of disc for vehicle wheel |
-
2000
- 2000-10-17 JP JP2000317100A patent/JP4233207B2/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006125521A (en) * | 2004-10-28 | 2006-05-18 | Sekisui Chem Co Ltd | Bell-and-spigot joint |
| JP4555662B2 (en) * | 2004-10-28 | 2010-10-06 | 積水化学工業株式会社 | Insertion fitting |
| WO2006057383A1 (en) * | 2004-11-29 | 2006-06-01 | The Yokohama Rubber Co., Ltd. | Run-flat supporting body and tire/wheel assembly |
| JP2006151187A (en) * | 2004-11-29 | 2006-06-15 | Yokohama Rubber Co Ltd:The | Run-flat support and tire-wheel assembly |
| US7681612B2 (en) | 2004-11-29 | 2010-03-23 | The Yokohama Rubber Co., Ltd. | Run-flat supporting body and tire/wheel assembly |
| US7896558B2 (en) | 2006-06-06 | 2011-03-01 | Ntn Corporation | Thrust roller bearing |
| JP2007333079A (en) * | 2006-06-15 | 2007-12-27 | Ntn Corp | Thrust roller bearing |
| JP4578441B2 (en) * | 2006-06-15 | 2010-11-10 | Ｎｔｎ株式会社 | Thrust roller bearing |
| JP2015006849A (en) * | 2013-06-25 | 2015-01-15 | トピー工業株式会社 | Vehicle wheel and manufacturing method of disc for vehicle wheel |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4233207B2 (en) | 2009-03-04 |
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