JPS5847532A - Press molding method of disk for load wheel - Google Patents

Abstract

PURPOSE:To manufacture a titled disk from a material whose ductility is low, by executing the first forming of a dome-like projecting part having a specified diameter and radius of curvature by drawing using a male die and a female die, forming a rough shape body for a disk by means of the second and third forming by a punch, and finish-drawing it by the male die and the female die. CONSTITUTION:A high tension steel plate 1 is drawn by a punch 3 and a die 4, and the first forming is executed so that a dome-like projecting part 2 having a diameter D0 and a radius of curvature P becomes 1/5<=P/D0<=1. This dome-like projecting part 2 is placed on a supporting base 5 so as to be turned upward, the center of the top part is pressed to the inside surface side by a punch 6, and a rough recessed surface 7 corresponding to a recessed surface on the outside surface of a disk, which becomes the second part 8. It is turned inside out, is supported by a supporting base 12, and a rough shape body for a disk 15 is obtained by pressing the rough recessed surface 7 from the back surface by a punch 14. This rough shape body 15 is finish-formed by a pressing punch 19 and a die 20 of a conventional method.

Description

【発明の詳細な説明】 この発明は延性の低い材料から自動車のロードホイール
用ディスクを製造するプレス成形方法に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a press molding method for manufacturing road wheel discs for automobiles from materials with low ductility.

従来ロードホイール用ディスクの成形において、複雑な
形状を順次成形加工していく必要があシ多工程に分はト
ランスファープレス等を用いその各工程での成形には、
それぞれの雄型と雌型とを要していた。Traditionally, when molding road wheel discs, complex shapes had to be molded one after another, and transfer presses were used for the multiple steps.
Each type required a male type and a female type.

しかし、前記従来技術によるプレス成形方法では、ディ
スクの板厚を５減少させ車体の軽量些に有利な高張力鋼
板等の延性の低いものをプレスするのは困難だった。However, with the press forming method according to the prior art, it is difficult to press materials with low ductility such as high tensile strength steel plates, which are advantageous in reducing the plate thickness of the disk by 5% and making the vehicle body lighter.

従来法では、雄型と雌型との間で被加工材のメタルフロ
ーが抑制され、大きい引張応力を受けながら変形するた
めこれに起因する被加工材の破断等が起きていた。In the conventional method, the metal flow of the workpiece between the male die and the female die is suppressed, and the workpiece deforms while being subjected to large tensile stress, resulting in breakage of the workpiece.

この発明はこのような事情に鑑みて提案されたもので、
その目的は延性の低い材料から複雑な形状のディスクを
比較的容易に製造し得るプレス成形方法を提供すること
にある。This invention was proposed in view of these circumstances.
The purpose is to provide a press forming method that can relatively easily manufacture disks of complex shapes from materials with low ductility.

以下この発明を図示する一実施例に基づいて説明する。The present invention will be described below based on an illustrated embodiment.

引張“強さが６０Ｋｇ／ｍ−級の高張力鋼板１にポンチ
３とダイス４とによシドーム状凸部２を絞シ″　成形す
る。ここで、ドーム状凸部２の頂部付近の曲率半径をρ
、直径Ｄｏとした場合、ρ／ＤＯ＝１／２程度とする。A dome-shaped convex portion 2 is drawn and formed on a high-tensile steel plate 1 having a tensile strength of 60 kg/m-class using a punch 3 and a die 4. Here, the radius of curvature near the top of the dome-shaped convex portion 2 is ρ
, the diameter Do, then ρ/DO=about 1/2.

また、ρが小さい場合にはドーム状凸部の絞シ成形中に
頂部破断を生じる。Furthermore, if ρ is small, the top portion will break during the drawing process of the dome-shaped convex portion.

そこで、前述のような問題の発生を防止するドーム状凸
部２の頂部付近のρを実験によシ求めたところドームの
直径をＤＯとした場合１１５≦ρ／Ｄｏ≦１　・・・・
・・（１）に設定すれば良いことが判明した。Therefore, we experimentally determined ρ near the top of the dome-shaped convex portion 2 to prevent the above-mentioned problem from occurring, and found that 115≦ρ/Do≦1, where DO is the diameter of the dome.
It turns out that setting (1) is sufficient.

このような鋼板１をドーム状凸部２が上方向に向くよう
に支持台５上に配置する。このように支持されたドーム
状凸部２の頂部中央をポンチ６によシ外面側から内面側
に向ってへこませる方向に押圧してディスクの外面にお
ける凹面に相当する粗凹面７を形成し、第二成形品８を
得る。この粗凹面７にはディスクのオーナメント部９．
′リプ部１０．ナツト座部１１の粗形状がドーム°状凸
部方向に自然にふくれて形成されている。このようなふ
くらみ９　、１０　、１１がない場合には、以後の雌型
を用いないディスクの成形は困難となる。このようなふ
くらみ９，１０．１１を与えるためにポンチ６にはオー
ナメント部９゜リプ部１０．ナツト座部１１に対応する
凹部６Ａ。Such a steel plate 1 is placed on a support base 5 so that the dome-shaped convex portion 2 faces upward. The center of the top of the dome-shaped convex portion 2 supported in this manner is pressed with a punch 6 in a direction to indent it from the outer surface side toward the inner surface side to form a rough concave surface 7 corresponding to the concave surface on the outer surface of the disk. , a second molded product 8 is obtained. This rough concave surface 7 has an ornament part 9 of the disk.
'Rep part 10. The rough shape of the nut seat portion 11 is formed so as to bulge naturally in the direction of the dome-shaped convex portion. If such bulges 9, 10, and 11 are not present, subsequent molding of the disk without using a female mold becomes difficult. In order to give such bulges 9, 10.11, the punch 6 has an ornament part 9 and a lip part 10. A recessed portion 6A corresponding to the nut seat portion 11.

６Ｂ、６Ｃが形成されている。6B and 6C are formed.

次に、第二成形品８を裏返しにして支持台１２に支持さ
せる（第４図参照）。この支持台１２は、第二・成形品
町を裏返した時に周縁部の頂部１３を支持するように構
成されている。粗凹面７をその裏面からポンチ１４によ
り押圧してディスク用粗形体１５を得る。ここで粗形体
１５には、ディスクの外面における部分凸部に対応する
オーナメント部１６．リプ部１７．ナツト座部１８が形
成され、これに対応してポンチ１４には凸部１４Ａ、１
４Ｂ。Next, the second molded product 8 is turned over and supported on the support stand 12 (see FIG. 4). This support stand 12 is configured to support the top 13 of the peripheral edge when the second molded part is turned over. The rough concave surface 7 is pressed from the back side with a punch 14 to obtain a rough shaped body 15 for a disk. Here, the rough-shaped body 15 has an ornament portion 16 corresponding to a partial convex portion on the outer surface of the disk. Rip part 17. A nut seat 18 is formed, and correspondingly the punch 14 has convex portions 14A, 1
4B.

１４Ｃが突設されている。14C is provided protrudingly.

ここで、支持台は抑圧回数や抑圧深度の具合によっては
、個々に変える必要はなく同一支持台上で表と裏と置き
換えることのみで連続的に粗形体１５を成形することも
できる。葦た支持台にはポンチに対向する位置にポンチ
進行のストッパーとして突起を設けてもよい。さらに、
説明の便宜上ポンチ６と１４の工程で圧延材を反転させ
たが、圧延材の位置決めを豆なえるようにしておけば圧
延材を反転させることなく支持台１２を上から押し込む
方式を取ってもよい。Here, depending on the number of times of compression and the depth of compression, the supporting table does not need to be changed individually, and the rough-shaped body 15 can be continuously formed by simply replacing the front and back sides on the same supporting table. A protrusion may be provided on the reed support base at a position facing the punch as a stopper for advancing the punch. moreover,
For the convenience of explanation, the rolled material was inverted in the steps of punches 6 and 14, but if the positioning of the rolled material is made consistent, it is also possible to use a method in which the support base 12 is pushed in from above without inverting the rolled material. .

このようにして成形された粗形体１５は決め押し用ポン
チ１９とダイス２０による従来方法で、ナツト座の高さ
出しを含む仕上成形される（第６゜７．８図参照）。仕
上成形されたディスク２１は、中央オーナメント部２２
の孔あけノ（−リングカ■工とナツト座部２３の孔あけ
コイニングとを経て、ロードホイール用ディるり２４と
して完成される。The rough-shaped body 15 formed in this way is finished formed by a conventional method using a final pressing punch 19 and a die 20, including increasing the height of the nut seat (see Fig. 6.7.8). The finished disk 21 has a central ornament part 22.
After drilling and coining the nut seat 23, the road wheel drill 24 is completed.

この発明は以上のような構成ｄ−らなるので以下のよう
な効果がある。Since this invention consists of the above configuration d-, it has the following effects.

■　機械的性質が表１のような高張力鋼板を用いて、こ
の発明による方法と従来技術による方法とでディスク粗
形体を成形し比較した結果表２が得られた。(2) Using a high-tensile steel plate whose mechanical properties are as shown in Table 1, a rough disk body was molded using the method according to the present invention and the method according to the prior art, and the results shown in Table 2 were obtained.

表１ 表２ 前記衣２から、この発明による方法を用いることによシ
延性の低い材料においても、その曲げ部板厚歪を一１０
％程度に２することが可能で、従来方法による軟質鋼板
による前記板厚型が一１５チ〜−６０％でおることを考
えればこの方法が優れていることがわかる。Table 1 Table 2 From the above-mentioned coating 2, it can be seen that even in materials with low ductility, by using the method according to the present invention, the strain in the thickness of the bent portion can be reduced by 100%.
It is possible to reduce the thickness to about 2%, and considering that the plate thickness of the conventional method using a soft steel plate is 115 inches to -60%, it can be seen that this method is excellent.

■　従来設備をほぼ転用し１．圧延性の低い金属をプレ
ス加工することが可能である。■ Most of the conventional equipment was repurposed.1. It is possible to press metals with low rollability.

■　型枠の数と、同型枠の摩耗を減少させることができ
る。■ The number of formworks and the wear of the same formworks can be reduced.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は絞シ成形工程を示す断面図、第２図は第二工程
を示す断面図、第３図はそのポンチを示す平面図、第４
図は第三工程を系す断面図、第５図はそのポンチを示す
部分平面図、第６図。 第７図は、仕上成形工程を示す断面図、第８図はその仕
上製品を示す平面図、第９図は最終製品を示す斜視図で
ある。 ｌ・・・・・・高張力鋼板、２・・・・・・ドーム状凸
部、３・・・・・・ポンチ、４・・・・・・ダイ、ス、
５・・・・・・支持台、６・・・・・・ポンチ、６Ａ、
６Ｂ、６Ｃ・・・・・・凹部、７・・・粗凹面、８・・
・・・・第二成形品、９−・・・・・オーナメント部、
１０・・・・・・、リブ部、１１・・・・・・ナツト座
部、１２・・・支持台、１３・・・・・・頂部、１４・
・・・・・ポンチ、１４Ａ、１４Ｂ。 １４０・・・・・・凸部、１５・・・・・・ディスク用
粗形体、１６”・・・オーナメント部、１７・・・・・
・リプ部、１８・・・・・・ナツト座部、１９・・・・
・・ポンチ、２０・・・・・・ダイス、２１・・・・・
・ディスク、２２・・・・・・オーナメント部、２３・
・・・・・ナツト座部、冴、・・・・・・ロードホイー
ル用ディスク。 特許出願人　　住友金属工業株式会社 代理人　　久　門　　　知　　　　、 第２図 第３図 第４１１　　　　　第５図 第６図 ｆｔＳ７図Fig. 1 is a sectional view showing the drawing process, Fig. 2 is a sectional view showing the second process, Fig. 3 is a plan view showing the punch, and Fig. 4 is a sectional view showing the drawing process.
The figure is a sectional view showing the third step, FIG. 5 is a partial plan view showing the punch, and FIG. 6 is a partial plan view showing the punch. FIG. 7 is a sectional view showing the final molding process, FIG. 8 is a plan view showing the finished product, and FIG. 9 is a perspective view showing the final product. l...High tensile strength steel plate, 2...Dome-shaped convex portion, 3...Punch, 4...Die, Su,
5...Support stand, 6...Punch, 6A,
6B, 6C... Concavity, 7... Rough concave surface, 8...
...Second molded product, 9-...Ornament part,
10... Rib part, 11... Nut seat part, 12... Support stand, 13... Top part, 14...
...Ponchi, 14A, 14B. 140... Convex portion, 15... Rough body for disk, 16"... Ornament part, 17...
・Rip part, 18... Natsu seat part, 19...
... Punch, 20 ... Dice, 21 ...
・Disk, 22... Ornament part, 23.
・・・・・・Natsuto seat, Sae, ・・・・Road wheel disc. Patent Applicant Sumitomo Metal Industries Co., Ltd. Agent Satoshi Hisakado, Figure 2 Figure 3 Figure 411 Figure 5 Figure 6 ftS7 Figure

Claims (1)

【特許請求の範囲】[Claims] （１）　　雄型と雌型とによる絞シ成形によって金属板
に、直径り。で曲率半径ρのドーム状の凸部を１７５≦
ρ／Ｄｏ≦１　となるように第一成形し、前記ドーム状
凸部の内面側には雌型を用！ることなくポンチによシド
ーム状凸部の頂部をへこませる方向に押圧してドーム状
凸部にディスクの外面における凹面に相当する粗凹面を
第二成形し、前記粗凹面をこの粗凹面の裏面からポンチ
によシ雌型を用いることなく押圧してディスクの外面に
おける部分凸部に対応する粗部分画部を第三成形してデ
ィスク用粗形体を得、次いでとの°ディスク用粗形体を
雄型と雌型によシ仕上げ成形することを特徴とするロー
ドホイール用ディスクのプレス成形方法。(1) A metal plate is made into a diameter by drawing with a male die and a female die. A dome-shaped convex part with a radius of curvature ρ is 175≦
First molding is performed so that ρ/Do≦1, and a female mold is used for the inner surface of the dome-shaped convex portion! A second rough concave surface corresponding to the concave surface on the outer surface of the disk is formed on the dome-shaped convex portion by pressing the top of the dome-shaped convex portion with a punch in the direction of concave, without touching the surface. A rough formed body for a disk is obtained by pressing from the back side with a punch without using a female mold to form a rough partial portion corresponding to a partial convex portion on the outer surface of the disk, and then a rough formed body for a disk is obtained. A press molding method for road wheel discs, which is characterized by finish molding a male mold and a female mold.