JPH0126781B2 - - Google Patents
Info
- Publication number
- JPH0126781B2 JPH0126781B2 JP58099537A JP9953783A JPH0126781B2 JP H0126781 B2 JPH0126781 B2 JP H0126781B2 JP 58099537 A JP58099537 A JP 58099537A JP 9953783 A JP9953783 A JP 9953783A JP H0126781 B2 JPH0126781 B2 JP H0126781B2
- Authority
- JP
- Japan
- Prior art keywords
- split mold
- parts
- crankshaft
- hydraulic
- tube
- 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.)
- Expired
Links
- 239000000463 material Substances 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 12
- 239000010720 hydraulic oil Substances 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 239000007858 starting material Substances 0.000 claims description 6
- 238000005096 rolling process Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 9
- 239000003921 oil Substances 0.000 description 7
- 229910000851 Alloy steel Inorganic materials 0.000 description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 239000011651 chromium Substances 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 229910052750 molybdenum Inorganic materials 0.000 description 3
- 239000011733 molybdenum Substances 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 229910052774 Proactinium Inorganic materials 0.000 description 2
- 229910052745 lead Inorganic materials 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/86—Making other particular articles other parts for bicycles or motorcycles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
- B21D26/043—Means for controlling the axial pusher
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Description
【発明の詳細な説明】
本発明は一本の素材管より自転車用の一体型ク
ランク材を製作する方法、特にクロム・モリブデ
ンを含む合金鋼製の素材管で、比較的肉厚のもの
を出発材料とし、左右２個のクランク並びにその
中央軸とを一体で製作する方法に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an integral crank member for a bicycle from a single material tube, in particular starting from a relatively thick material tube made of alloy steel containing chromium and molybdenum. The present invention relates to a method for manufacturing two left and right cranks and their central shaft in one piece using the same material.
従来、上述の如き一体型クランク材は中実の棒
鋼を出発材料として製作され且つ特殊用途の自転
車、例えばモトクロス用に採用されて居る。しか
し乍ら、その製作は決して容易なものではなく、
中央に当るクランク軸に２ケ所、ねじ山を付けな
ければならない。そのためねじ山に相当する部分
を多少降起させる必要があり、棒鋼の所定部分に
対し、圧延・スウエージング等の特殊加工をほど
こして要望に答えなければならない。 Conventionally, the above-mentioned integral crank members have been manufactured starting from solid steel bars and have been adopted for special purpose bicycles, such as motocross bicycles. However, its production is by no means easy,
Two screw threads must be added to the crankshaft in the center. Therefore, it is necessary to lower the portion corresponding to the thread to some extent, and special processing such as rolling or swaging must be applied to a predetermined portion of the steel bar to meet the request.
また自転車の一般公知のクランク部品は、左右
のクランクが２個とクランク軸との３個の部品よ
り成り、組立に当つては幾つもの小物部品を必要
としている。 Furthermore, the generally known crank parts for bicycles consist of three parts: two left and right cranks, and a crankshaft, and require a number of small parts for assembly.
市販の一体型クランクは棒鋼を素材とするに反
し、本発明では鋼管を出発材料とし、特別注文の
肉厚の厚い、例えば厚さ3.5mmで外径が18mmとい
う鋼管で、更にクロム・モリブデン含有の合金鋼
鋼管を用いることにする。 Unlike commercially available integrated cranks, which are made from steel bars, in the present invention, we use steel pipes as the starting material, and we use custom-made thick-walled steel pipes, for example, 3.5 mm thick and 18 mm outside diameter, which also contain chromium and molybdenum. We will use alloy steel pipes.
このような素材管としてJIS G3441（1996）構
造用合金鋼鋼管があり、その規格によるとクロム
0.90―1.20％、モリブデン0.15―0.30％という含
有量であり、其他炭素0.28―0.33％、けい素0.15
―0.35％、マンガン0.60―0.85％、りんといおう
とは夫々0.030％以下となつている。 JIS G3441 (1996) structural alloy steel pipes are examples of such material pipes, and according to the standard, chromium
The content is 0.90-1.20%, molybdenum 0.15-0.30%, carbon 0.28-0.33%, silicon 0.15%.
-0.35%, manganese 0.60-0.85%, and phosphorus and phosphorus are each less than 0.030%.
上述の合金鋼鋼管を出発材料として用いるもの
とし、その全長を440mm、中央部を占める軸部分
を90mmとすれば、残り350mmが左右２個のクラン
クの合計長さとなり、クランク１個分の長さは
175mmとなる。自転車の車体のサイズは多種多様
存在するので、この全長440mmはほんの一例にす
ぎないものである。 Assuming that the above-mentioned alloy steel pipe is used as a starting material, and its total length is 440 mm, and the shaft portion occupying the center is 90 mm, the remaining 350 mm is the total length of the two left and right cranks, which is the length of one crank. Saha
It becomes 175mm. There are a wide variety of bicycle body sizes, so this total length of 440 mm is just one example.
これを添付図面について以下詳細に述べる。 This will be described in detail below with reference to the accompanying drawings.
第１図は本発明で用いる出発材料の合金鋼鋼管
１の縦断面図であり、全長は上述の一例により
440mm、肉厚が3.5mm、外径が18mmとする。 FIG. 1 is a longitudinal cross-sectional view of an alloy steel pipe 1, which is the starting material used in the present invention, and the total length is determined according to the above example.
440mm, wall thickness 3.5mm, outer diameter 18mm.
この素材管１を第２図に示す割型６にセツトす
る。この割型６は上型と下型とに分割可能のもの
で、素材管１の中央部90mmにおいて、20mmという
長さの部分が２ケ所において間隔50mmをおき、円
筒状に膨出成形できるように凹陥部２ケ所１３と
１４とが凹刻されている。 This material tube 1 is set in a split mold 6 shown in FIG. This split mold 6 can be divided into an upper mold and a lower mold, and 20 mm long parts are placed in two places at 90 mm in the center of the material tube 1 with an interval of 50 mm, so that it can be bulged into a cylindrical shape. Two recessed portions 13 and 14 are engraved on the surface.
第２図は油圧バルジ成形法の概念図を示し、こ
の第２図と第４図の油圧バルジ成形プレス機の概
念図とは更に詳細に後述する。 FIG. 2 shows a conceptual diagram of the hydraulic bulge forming method, and the conceptual diagrams of the hydraulic bulge forming press shown in FIGS. 2 and 4 will be described in more detail later.
第３図は油圧バルジ成形法により円筒状膨出部
３と４とを成形して成る素材管１の縦断面図であ
り、円筒状膨出部３と４とはその長さが夫々20mm
で、膨出部３と４との間隔は50mmであり、即ち換
言すれば合計で90mmに相当する長さがクランク軸
となる。このクランク軸はハンガー・ラツグに収
容される。 FIG. 3 is a longitudinal cross-sectional view of the material tube 1 formed by forming cylindrical bulges 3 and 4 by the hydraulic bulge forming method, and the cylindrical bulges 3 and 4 each have a length of 20 mm.
The distance between the bulges 3 and 4 is 50 mm, or in other words, the crankshaft has a length corresponding to a total of 90 mm. This crankshaft is housed in a hanger lug.
円筒状膨出部３と４との外径は管材１の外径18
mmであるのに約23mmに膨脹しているので、この膨
脹比は約1.27であり、従来公知のバルジ成形比の
範囲内にある。 The outer diameter of the cylindrical bulges 3 and 4 is the outer diameter of the tube 1, 18
mm, but it has expanded to about 23 mm, so this expansion ratio is about 1.27, which is within the range of conventionally known bulge forming ratios.
次に割型より取出した素材管１の円筒状膨出部
に対しねじ切を行うのであるが、この場合、素材
管１を第５図の斜視図に示すようにクランク軸に
関して同一平面上において素材管の両端部分即ち
左右クランク部分を、垂直且つ互に異なる方向に
折曲げて、クランク材としてから、ねじ切を行う
べきか、或いはまた割型から取出した直線状素材
管にねじ切を行つて後、上記のように折曲げるか
という選択を考えなければならない。 Next, thread cutting is performed on the cylindrical bulge of the material tube 1 taken out from the split mold.In this case, the material tube 1 is placed on the same plane with respect to the crankshaft as shown in the perspective view of FIG. Should both end portions of the tube, that is, the left and right crank portions, be bent vertically and in different directions to form a crank material before thread cutting, or alternatively, after thread cutting is performed on a straight material tube taken out from a split mold, You have to consider the option of folding it as shown above.
ねじの精度を考慮すると、折曲げが終了した時
点でねじ切を行う方がよいように思われる。第５
図において、クランク１ａと１ｂとの先端にはペ
ダルPaとPbとが取付けられ、膨出部には夫々ね
じ山３ａ，４ａが付けられている。 Considering the accuracy of the thread, it seems better to cut the thread once the bending is completed. Fifth
In the figure, pedals Pa and Pb are attached to the tips of cranks 1a and 1b, and screw threads 3a and 4a are attached to the bulges, respectively.
第６図はクランク軸を示すもので、軸の円筒状
膨出部にねじ山３ａと４ａとが作られて居り、こ
れらのねじ山はクランク軸をハンガー・ラツグ内
に収容して組立てる時に必要である。またギヤの
スリツプ止め５を示す。 Figure 6 shows the crankshaft, and the cylindrical bulge of the shaft has threads 3a and 4a, which are necessary when assembling the crankshaft in the hanger lug. It is. Also shown is the gear slip stopper 5.
次に第２図に示す割型を含む油圧回路図と、油
圧バルジ成形プレス機の概念図を表わす第４図と
について次に述べる。 Next, a hydraulic circuit diagram including a split mold shown in FIG. 2 and FIG. 4 showing a conceptual diagram of a hydraulic bulge forming press will be described below.
油圧バルジ成形法とは高圧作動油の作用によつ
て金属管材の一部を膨出させ、所要の形状が得ら
れることを目的としたものであつて、既に日本特
許417728、418055、480529、482147、730010等に
よつて開示されて居り、自転車工業界においても
導入実施化され、早くも10年以上を経過し、本発
明者の属する部品製造会社における先輩が「自転
車等のシングル・ユニツト型装飾付ヘツド・ラツ
グ製造法及び装置」と題し油圧バルジ成形法の一
つの応用例を出願し特許公告昭53−12460（昭
53.5.1公告）となり、ついで日本特許982106を取
得した。 The hydraulic bulge forming method is a method in which a part of a metal pipe material is bulged by the action of high-pressure hydraulic oil to obtain a desired shape, and has already been disclosed in Japanese Patent Nos. 417728, 418055, 480529, and 482147. , 730010, etc., and it has been introduced and implemented in the bicycle industry, and more than 10 years have passed since then. He applied for an application example of the hydraulic bulge forming method under the title ``Method and Apparatus for Manufacturing Head Lugs'' and published a patent in 12460-1246.
53.5.1 public notice) and subsequently obtained Japanese patent 982106.
同特許によれば一本の管材を割型内にセツト
し、高圧作動油を管材の両端より導入し、管軸の
一方の側に２個の膨出突起部を成形して一次成形
品を得るものであり、更に一次成形品を第２の割
型にセツトしマンドレルを圧入して外面にウエー
ブ模様を付与し目的とするヘツド・ラツグを製作
するにある。 According to the patent, a single tube is set in a split mold, high-pressure hydraulic oil is introduced from both ends of the tube, and two protrusions are formed on one side of the tube shaft to form a primary molded product. Furthermore, the primary molded product is set in a second split mold, and a mandrel is press-fitted to give the outer surface a wave pattern to produce the desired head rug.
同特許の図面を援用し、本発明に応用する油圧
バルジ成形法を述べる。 The hydraulic bulge forming method applied to the present invention will be described with reference to the drawings of the same patent.
第４図は本発明において採用するアーチ形フレ
ーム形式の油圧バルジ成形プレス機１９の概念図
を示し、同図においてアーチ２０の中央より垂直
方向に油圧で上下動するラム１５を吊下げ、この
ラム１５は割型の上型６を固着し、その下型６ａ
はプレス機械のベツド１６に固着する。ラム１５
の両側には油圧で水平状に動くラム１７，１８と
を設置し、管材１をセツトして密閉した割型を、
ラム１５，１７，１８によつてベツド１６上に固
定し、油圧により所要の膨出成形を行う。そのた
め第２図に示す油圧回路を利用するが、この図も
上記の特許の図面を踏襲しているが、但し次の点
が異なる：
１ 管材１は肉厚の厚い合金鋼製であるから作動
油の圧力を1500―2000Kg/cm2という高圧に高め
る。 FIG. 4 shows a conceptual diagram of an arch-frame type hydraulic bulge forming press 19 employed in the present invention. 15 fixes the upper mold 6 of the split mold, and the lower mold 6a
is fixed to the bed 16 of the press machine. Ram 15
Rams 17 and 18 that move horizontally using hydraulic pressure are installed on both sides of the mold, and the pipe material 1 is set and the sealed split mold is opened.
It is fixed on the bed 16 by rams 15, 17, and 18, and the required expansion molding is performed by hydraulic pressure. For this purpose, the hydraulic circuit shown in Fig. 2 is used, and this figure also follows the drawing of the above-mentioned patent, except for the following points: 1. Since the pipe material 1 is made of thick alloy steel, it is difficult to operate. Increase the oil pressure to a high pressure of 1500-2000Kg/cm 2 .
２ 膨出部は管軸に対し一方の側のみではなく管
軸の周りを円筒状に膨出する。2. The bulging portion bulges out not only on one side of the tube axis but in a cylindrical shape around the tube axis.
第２図において割型６と管材１との長さが短か
く描かれていることは御諒承願いたい。 Please note that in Figure 2, the lengths of the split mold 6 and the pipe material 1 are drawn short.
同図において割型６内にセツトされた管材１の
中へピストン８，８ａの中心を通る油導入孔９，
９ａを通り作動油１２が給油ポンプ１０から、給
油配管１０ａ，１０ｂを経て導入され、管材１の
中に作動油が充満すると、ピストン８，８ａはポ
ンプ１１によつて押圧され、更に水平ラム１７，
１８の協力も得て管材１の両端は密封される。給
油ポンプ１０は作動油を供給すると同時に作動油
１２の圧力を高める働らきをも備えることができ
るので、作動油１２の管材内における圧力値を
1500―2000Kg/cm2まで高め、所要の円筒状膨出を
管材１の所要個所に実現させることができる。こ
れは本発明者の工場において自転車部品を日夜大
量に生産してきた過去10余年の経験を有する油圧
バルジ成形法の威力のお蔭と云えよう。 In the figure, an oil introduction hole 9, which passes through the center of the pistons 8, 8a, into the pipe material 1 set in the split mold 6,
9a, hydraulic oil 12 is introduced from the oil supply pump 10 via the oil supply pipes 10a, 10b, and when the pipe 1 is filled with the hydraulic oil, the pistons 8, 8a are pressed by the pump 11, and then the horizontal ram 17 ，
With the cooperation of 18, both ends of the tube 1 are sealed. Since the oil supply pump 10 can have the function of increasing the pressure of the hydraulic oil 12 at the same time as supplying the hydraulic oil, it can reduce the pressure value of the hydraulic oil 12 inside the pipe material.
It is possible to increase the pressure to 1500-2000 Kg/cm 2 and achieve the required cylindrical bulge at the required location of the pipe material 1. This can be said to be due to the power of the hydraulic bulge forming method, which the inventor has had over 10 years of experience producing bicycle parts in large quantities day and night at his factory.
第２図においてシリンダー７，７ａ、またピス
トン８，８ａを操作する配管１１ａ，１１ｂ，１
１ｃ，１１ｄを示す。 In FIG. 2, piping 11a, 11b, 1 for operating cylinders 7, 7a and pistons 8, 8a.
1c and 11d are shown.
以上述べたように本発明による一体型クランク
材の製作法は、省資源・省エネルギー・省力とい
う点から有用な発明であると云えよう。 As described above, it can be said that the method of manufacturing an integral crank member according to the present invention is a useful invention from the viewpoint of saving resources, saving energy, and saving labor.
第１図は本発明の出発材料、第２図は油圧バル
ジ成形法の概念図、第３図は油圧バルジ成形法に
よつて出発材料の管材の２個所が円筒状に膨出し
た所を示す縦断面図、第４図は油圧バルジ成形機
の概念図、第５図は完成せる一体型クランクにペ
ダルを取付けた見取図、第６図はクランク軸の２
個所にねじ山を付け左右クランクの一部を表わす
図である。
１…管材、１ａ，１ｂ…左右クランク、３，４
…円筒状膨出部、３ａ，４ａ…ねじ山、５…ギ
ヤ・スリツプ止、６，６ａ…割型、７，７ａ…シ
リンダ、８，８ａ…ピストン、９，９ａ…油導入
孔、１０…給油ポンプ兼昇圧ポンプ、１１…ピス
トン操作ポンプ、１２…作動油、Pa，Pb…ペダ
ル、１５…上下動ラム、１６…テーブル、１７，
１８…水平動ラム、１９…バルジ成形機、２０…
アーチ型支柱。
Figure 1 shows the starting material of the present invention, Figure 2 is a conceptual diagram of the hydraulic bulge forming method, and Figure 3 shows two locations of the starting material tube bulged into a cylindrical shape by the hydraulic bulge forming method. Fig. 4 is a conceptual diagram of the hydraulic bulge forming machine, Fig. 5 is a sketch of the completed integrated crank with a pedal attached, and Fig. 6 is a diagram of the two parts of the crankshaft.
It is a diagram showing a part of the left and right cranks with screw threads attached thereto. 1...Pipe material, 1a, 1b...Right and left cranks, 3, 4
...Cylindrical bulge, 3a, 4a...Screw thread, 5...Gear/slip stop, 6,6a...Split mold, 7,7a...Cylinder, 8,8a...Piston, 9,9a...Oil introduction hole, 10... Oil supply pump and booster pump, 11... Piston operation pump, 12... Hydraulic oil, Pa, Pb... Pedal, 15... Vertical movement ram, 16... Table, 17,
18...Horizontal motion ram, 19...Bulge forming machine, 20...
arched support.
Claims (1)
分とを含む所定長さの鋼管素材を出発材料とし、
該クランク軸部分内で所定長さの２ケ所をとり該
鋼管外径の約1.2乃至1.4倍の太さに膨出成形すべ
き２ケ所の凹陥部を凹刻する割型を作り該鋼管を
該割型内に装入し、該割型を油圧バルジ成形機に
装入し作動油の圧力値を1500乃至2000Kg/cm2に昇
圧して該２ケ所凹陥部に対応する２ケ所の膨出成
形部を作り、これを該割型より取出し、該膨出成
形部２ケ所を転造ねじ加工によりねじ山を成形
し、得られた該素材管を同一平面上において該ク
ランク軸に関し該素材管の両端部分を垂直且つ相
反する方向に夫々折曲げて成ることを特徴とする
素材管から自転車用一体型クランク材の製作法。1. Starting material is a steel pipe material of a predetermined length including two left and right crank parts and a central crankshaft part,
Two parts of a predetermined length are taken within the crankshaft portion, and a split mold is made to indent two recessed parts to be expanded to a thickness of approximately 1.2 to 1.4 times the outer diameter of the steel pipe, and the steel pipe is molded. The mold is charged into a split mold, and the split mold is charged into a hydraulic bulge forming machine, and the pressure of the hydraulic oil is increased to 1500 to 2000 Kg/cm 2 to form bulges at two locations corresponding to the two recessed portions. This is taken out from the split mold, the two bulging parts are threaded by thread rolling, and the obtained material tube is placed on the same plane with respect to the crankshaft. A method for manufacturing an integrated crank material for a bicycle from a material tube, characterized in that both end portions are bent vertically and in opposite directions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58099537A JPS59225835A (en) | 1983-06-06 | 1983-06-06 | Manufacture of monolithic type crank material for bicycle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58099537A JPS59225835A (en) | 1983-06-06 | 1983-06-06 | Manufacture of monolithic type crank material for bicycle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59225835A JPS59225835A (en) | 1984-12-18 |
| JPH0126781B2 true JPH0126781B2 (en) | 1989-05-25 |
Family
ID=14249946
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58099537A Granted JPS59225835A (en) | 1983-06-06 | 1983-06-06 | Manufacture of monolithic type crank material for bicycle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59225835A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2703606A1 (en) * | 1993-04-10 | 1994-10-14 | Gkn Automotive Ag | Method of manufacturing hollow shafts having a profile |
| FR2760666B1 (en) * | 1997-03-12 | 1999-04-23 | Ascometal Sa | METHOD FOR MANUFACTURING A CRANKSHAFT, ESPECIALLY AN INTERNAL COMBUSTION ENGINE |
| JP5037020B2 (en) * | 2006-02-08 | 2012-09-26 | 新日本製鐵株式会社 | Manufacturing method of metal pipe parts |
-
1983
- 1983-06-06 JP JP58099537A patent/JPS59225835A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59225835A (en) | 1984-12-18 |
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