JPS61137635A - Production of crank shaft for bicycle - Google Patents

Production of crank shaft for bicycle

Info

Publication number
JPS61137635A
JPS61137635A JP25956584A JP25956584A JPS61137635A JP S61137635 A JPS61137635 A JP S61137635A JP 25956584 A JP25956584 A JP 25956584A JP 25956584 A JP25956584 A JP 25956584A JP S61137635 A JPS61137635 A JP S61137635A
Authority
JP
Japan
Prior art keywords
dies
stock
shaft
bicycle
central part
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.)
Pending
Application number
JP25956584A
Other languages
Japanese (ja)
Inventor
Yasushi Sugino
杉野　安
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SUGINO TECHNO KK
Original Assignee
SUGINO TECHNO KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by SUGINO TECHNO KK filed Critical SUGINO TECHNO KK
Priority to JP25956584A priority Critical patent/JPS61137635A/en
Publication of JPS61137635A publication Critical patent/JPS61137635A/en
Pending legal-status Critical Current

Links

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)

Abstract

PURPOSE:To form the large-diameter part of a supporting part and the small- diameter part of an attaching part by cold-pressing by enclosing the central part of shaft stock corresponding to the supporting part with stationary dies and compressing both ends of the shaft stock corresponding to the attaching part with movable dies in the axial direction. CONSTITUTION:The central part of the shaft stock cut to the prescribed length is enclosed with the stationary dies 6 consisting of an upper die 4 and a lower die 5 and the movable dies 7, 7 are set at both ends. The stock is pressed and held from a vertical direction by the dies 6; at the same time the movable dies 7, 7 at both ends compress axially the shaft stock. Then tapered parts 8 are formed at both ends of the stock 1 and large-diameter flange parts 9, 9 are formed in the central part. A crank shaft 10 is thus formed. The central part near the flange parts 9 acts as the supporting part to be supported freely rotatably by the body of a bicycle and the tapered parts 8 at both ends act as the attaching part to be fitted with crank arms.

Description

【発明の詳細な説明】 〈産業上の利用分野〉 本発明は、自転車用クランク軸の製造方法に関する。[Detailed description of the invention] <Industrial application field> The present invention relates to a method for manufacturing a bicycle crankshaft.

〈従来の方法〉 従来、自転車用クランク１ｌＩｌ！Ｉは、第３図に示す
如く、軸素材（１）″を所定長さにｑ断しくＩ）−両端
を加工し岨）→圧造により外形がほぼクランク軸の外形
になるよう成形し［相］−ツバ部外径及びテーパー増の
切削を行い拍−転造で両端にねじを切υ（Ｖ）−焼入（
Ｗｌ−バーカーライジング処理（２）、等の製造工程を
経て完成されていた。<Conventional method> Conventionally, bicycle crank 1lIl! As shown in Fig. 3, the shaft material (1)'' is cut into a predetermined length (I) - both ends are machined (I) - then the outer shape is formed by pressing so that the outer shape is approximately the same as that of the crankshaft. ] - Cut the outside diameter of the flange and increase the taper, then cut threads at both ends by rolling and υ (V) - Quenching (
It was completed through manufacturing processes such as Wl-Barker Rising Treatment (2).

〈発明が解決しようとする問題点〉 上記従来の方法では、工程が多く、コスト高の原因にな
ってい念。<Problems to be solved by the invention> The conventional method described above requires many steps, which causes high costs.

そこ、で、本発明は、極めて簡単な方法でかつ低コスト
で製造することができる自転車用クランク軸の製造方法
を提供することを目的とする。Therefore, an object of the present invention is to provide a method for manufacturing a bicycle crankshaft that can be manufactured using an extremely simple method and at low cost.

〈問題点を解決するための手段〉 本発明は、上記問題点を解決するため、次の手段を講じ
た。即ち、本発明の特徴とする処は、自転車の車体に回
転自在に支持される支持部と、該支持部両端部にクラン
クアームが取付けられる取付部とから成るクランク軸の
製造方法において、前記支持部に相当する軸素材の中央
部を固定金型で包囲し、取付部に相当する軸素材の両端
部金可動金型で軸方向に圧縮することにより、支持部の
径大部、取付部の小径部ｔ−ＥＥ造成形する点にある。<Means for Solving the Problems> In order to solve the above problems, the present invention takes the following measures. That is, the present invention is characterized in that a method for manufacturing a crankshaft includes a support part rotatably supported on a bicycle body, and a mounting part to which a crank arm is attached to both ends of the support part. By enclosing the central part of the shaft material corresponding to the section with a fixed mold, and compressing both ends of the shaft material corresponding to the mounting part in the axial direction with movable molds, the large-diameter part of the support part and the mounting part are The point is that the small diameter part t-EE is formed.

〈５ｊ！麿例〉 以下、本発明の実施例を図面に基づき詳述する。<5j! Maro example> Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

第１図に示す如く、丸棒全所定長さに切断した軸素材（
１）ｔ−ホッパー（２）へ投入する（Ｉ）。このホッパ
ー（２）から軸素材（１）が一本ずつ搬出される。As shown in Figure 1, the shaft material (
1) Charge (I) into the t-hopper (2). The shaft material (1) is carried out one by one from this hopper (2).

次に軸素材＜１）はロー〃刻印機（３）で、長手方向中
央部に刻印される卯。Next, the shaft material <1) is stamped in the center in the longitudinal direction using a low stamping machine (3).

次に軸素材（１）は中央部を上Ｉ！Ｊ！（４）と下ｍ　
（５）とから成る固定金型（６）で包囲でれる。軸素材
（１）の両端部には可動金型（７）がセットされる。し
かして固定金型（６）が上下方向から押圧保持されると
共に、両端部の可動金型（７）　（７）が軸素材（１）
　？　＠方向にＥＥＪｉｆする。Next, place the shaft material (1) with the center part up! J! (4) and lower m
(5) and is surrounded by a fixed mold (6). Movable molds (7) are set at both ends of the shaft material (1). Thus, the fixed mold (6) is pressed and held from above and below, and the movable molds (7) at both ends are pressed against the shaft material (1).
? EEJif in the @ direction.

上記圧造により、軸素材（１）は、第１図−に示すよう
に、両端部にテーパ一部（８）が形成され、中央部に大
径の７ランノ部（９）が形成され、クランク軸αＱとな
る。As shown in Fig. 1, the shaft material (1) is formed with tapered parts (8) at both ends and a large-diameter 7-run no part (9) in the center by the forging process described above. The axis becomes αQ.

上記７ランノ部（９）近傍の中央部は、自転車の車体に
回転自在に支持される支持部となり、両端のテーパ一部
（８）はクランクアームが嵌合される取付部となる。こ
れらの支持部及び取付部は、以後機械加工等することな
く、上記の圧造でもって完成工程とされている。The central portion near the seven-runway portion (9) serves as a support portion that is rotatably supported by the bicycle body, and the tapered portions (8) at both ends serve as attachment portions into which a crank arm is fitted. These support portions and attachment portions are completed by the forging described above without any further machining.

尚、゛第２図に示すものは、両端部にねじ部（６）を有
するクランク軸αｑであるが、このような形状であって
も、１１１１図［相］に示すＥＥ！工程でクランク軸α
Ｑの外形は一度に成形される。但し、ねじ切はその後転
造等で加工される、 上記の如く圧造により外形が成形され九クランク軸αＱ
は、その後、焼入やバーカライジング等の処理がされて
完成する。Although the crankshaft αq shown in FIG. 2 has threaded portions (6) at both ends, even with such a shape, the EE! shown in FIG. Crankshaft α in the process
The external shape of Q is molded at one time. However, the thread cutting is then processed by rolling, etc. As mentioned above, the outer shape is formed by heading and the nine crankshaft αQ
is then subjected to treatments such as hardening and barcalizing to complete it.

尚、本発明はコツタートタイプ又はブーツターレスタイ
プのいずれのクランク軸にも適用されるものである。It should be noted that the present invention is applicable to either a crankshaft of the compact type or the bootless type.

ま土木発明は、中寮九棒を素材とすることなく、パイプ
素材を用い比ものにも適用できる。The civil engineering invention can also be applied to a concrete structure using a pipe material instead of using the Nakaryo Nine Sticks as a material.

〈発明の効果〉 本発明によれば、一度の圧造工程で略完成さぜることが
でき、極めて闇単にかつ低コストで製造することができ
るものである。<Effects of the Invention> According to the present invention, the product can be almost completed in a single forging process, and can be manufactured extremely simply and at low cost.

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

第１図は本発明の５１！施例を示す工程図、第２図は他
の１類のクランク軸を示す正面図、第３図は従来例を示
す工程図である。 （１）・・・軸素材、（６）・・・固定金型、（７）・
・・可動金ｍ６手続補正書〔自発〕 昭和６０年Ｉ　月　１６日 昭和５９年　特許　願第２５９５６５　　ジノ２・発　
　　明　の名称 自転凧用クランク軸の！１！造万８ ３、補正をする者 事件との関係　ＷＰｅ−願人 株式会社スギノテクノ ４、代理人　８５７７Figure 1 shows 51! of the present invention! FIG. 2 is a front view showing another type 1 crankshaft, and FIG. 3 is a process drawing showing a conventional example. (1)...Shaft material, (6)...Fixed mold, (7)...
...Movable money m6 procedural amendment [spontaneous] January 16, 1985 Patent application No. 259565 issued by Jino 2.
Akira's name for the crankshaft for rotating kites! 1! Zoman 8 3. Relationship with the person making the amendment WPe-Applicant Sugino Techno Co., Ltd. 4, Agent 8577

Claims (1)

【特許請求の範囲】 １、自転車の車体に回転自在に支持される支持部と、該
支持部両端部にクランクアームが取付けられる取付部と
から成るクランク軸の製造方法において、 前記支持部に相当する軸素材の中央部を固定金型で包囲
し、取付部に相当する軸素材の両端部を可動金型で軸方
向に圧縮することにより、支持部の径大部、取付部の小
径部を圧造成形することを特徴とする自転車用クランク
軸の製造方法。[Claims] 1. A method for manufacturing a crankshaft comprising a support part rotatably supported on a bicycle body and a mounting part to which a crank arm is attached to both ends of the support part, which corresponds to the support part. By surrounding the central part of the shaft material with a fixed mold and compressing both ends of the shaft material corresponding to the mounting part in the axial direction with a movable mold, the large diameter part of the support part and the small diameter part of the mounting part are A method for manufacturing a bicycle crankshaft, which is characterized by forging.
JP25956584A 1984-12-07 1984-12-07 Production of crank shaft for bicycle Pending JPS61137635A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP25956584A JPS61137635A (en) 1984-12-07 1984-12-07 Production of crank shaft for bicycle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP25956584A JPS61137635A (en) 1984-12-07 1984-12-07 Production of crank shaft for bicycle

Publications (1)

Publication Number Publication Date
JPS61137635A true JPS61137635A (en) 1986-06-25

Family

ID=17335888

Family Applications (1)

Application Number Title Priority Date Filing Date
JP25956584A Pending JPS61137635A (en) 1984-12-07 1984-12-07 Production of crank shaft for bicycle

Country Status (1)

Country Link
JP (1) JPS61137635A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101767174A (en) * 2010-02-25 2010-07-07 无锡透平叶片有限公司 Loose tooling upsetting device of continuous upsetting heads at both ends of long rod material
JP2013099766A (en) * 2011-11-09 2013-05-23 Neturen Co Ltd Sleeve for axial-diameter-enlarging work, axial-diameter-enlarging work apparatus, and axial-diameter-enlarging work method employing the same
CN105436375A (en) * 2015-12-28 2016-03-30 无锡透平叶片有限公司 Loose tooling upsetting device and method capable of realizing continuous double-end upsetting of medium and long rods
RU2614224C2 (en) * 2014-07-01 2017-03-23 Смс Груп Гмбх Method and upsetting device for manufacturing of ledged parts, such as shafts and rods

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4512208Y1 (en) * 1967-01-27 1970-05-28

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4512208Y1 (en) * 1967-01-27 1970-05-28

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101767174A (en) * 2010-02-25 2010-07-07 无锡透平叶片有限公司 Loose tooling upsetting device of continuous upsetting heads at both ends of long rod material
JP2013099766A (en) * 2011-11-09 2013-05-23 Neturen Co Ltd Sleeve for axial-diameter-enlarging work, axial-diameter-enlarging work apparatus, and axial-diameter-enlarging work method employing the same
RU2614224C2 (en) * 2014-07-01 2017-03-23 Смс Груп Гмбх Method and upsetting device for manufacturing of ledged parts, such as shafts and rods
CN105436375A (en) * 2015-12-28 2016-03-30 无锡透平叶片有限公司 Loose tooling upsetting device and method capable of realizing continuous double-end upsetting of medium and long rods

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