JPS62142020A - Drawing method for tube stock - Google Patents

Abstract

PURPOSE:To reduce manhours of set-up and to improve the yield of products by previously pointing on a short-sized tube, welding the tube to the to end of a tube to be drawn, and inserting the short-sized tube first into a drawing die. CONSTITUTION:An end of a short-sized tube 2 having the same diameter as that of a tube 1 to be drawn is pointed using a pointing roll. Then, butt welding 3 is performed to weld another end of the tube 2 to the top end of the tube 1. After the outside periphery of the tubes 1 and 2 is smoothed by deburring work on the welded part, the tubes 1 ad 2 are inserted into a drawing die 4 with the pointed part of the tube 2 in advance of the tube 1 and are drawn. In this method, manhours of set-up for drawing work are reduced and the yield of products is improved because of reduction of an amount of scrapping parts.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は金属管等の管材の伸管方法に関するものである
。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for drawing pipe materials such as metal pipes.

〔従来の技術および問題点〕[Conventional technology and problems]

一般に金属管等の管材を引き抜きダイスに通して細径に
引き抜き加工する場合、その被伸管材の先端がダイス孔
中に差′し込めるように、先ず被伸管材を一対の圧着ロ
ール（口付はロールと称される。）間にかませて被伸管
材の先端を圧潰し次いでもう一度被伸管材を９０度回転
させて圧着ロール間にかませ先細なるように加工（口付
は加工と称される。）しなければならない。ところが被
伸管材が例えばコイル状に巻かれたもの、あるいは大径
のもの等重量物である場合にはその先端部を前記したよ
うに一方向から圧潰し次いで９０度方向を変えてもう一
度圧潰しするものであるから、コイル状をした伸管材で
あればこれを起こしたり倒したりして口付はロールにか
ませる方向を変えるのに労力がかかり、したがってふつ
うはコイルを一巻分位巻き解いてループを作りこのルー
プをひねることで方向を変えるようにしているが、この
ときルー２プの個所をひねったり変形させたりして管を
つぶすなどにより製品歩留を低下させるなどの問題があ
った。Generally, when drawing a pipe material such as a metal pipe through a drawing die into a small diameter, the material to be drawn is first passed through a pair of crimping rolls (with a ) The tip of the tube material to be stretched is crushed by pressing the tube material between them.Then, the tube material to be stretched is rotated 90 degrees again, and the tube material is pressed between crimping rolls to make it tapered. ) must be done. However, if the tube material to be stretched is heavy, such as one wound into a coil shape or one with a large diameter, the tip is crushed from one direction as described above, then the direction is changed 90 degrees and crushed again. Therefore, if it is a coiled pipe material, it takes a lot of effort to raise and fold it and change the direction in which the end is caught on the roll. Therefore, it is usually necessary to unwind the coil by one turn. In this method, a loop is made and the direction is changed by twisting the loop. However, there are problems such as twisting or deforming the loop 2 and crushing the tube, which reduces the product yield. Ta.

〔発明の目的および構成〕[Object and structure of the invention]

本発明の目的は伸管作業労力の軽減、並びにコイル状の
被伸管材にあっては更に製品歩留の向上を図ることにあ
り、この目的達成のため本発明は被伸管材と略同一径の
短尺管の先端を予め口付は加工し、被伸管材の先端に前
記短尺管の基端を溶接により接合し、該短尺管を引き抜
きダイスへさし込むようにしたことを特徴とするもので
ある。The purpose of the present invention is to reduce the labor involved in drawing tubes and to further improve the product yield for coiled tube materials to be drawn.To achieve this purpose, the present invention has been developed to The tip of the short tube is previously machined with a spout, the proximal end of the short tube is joined to the tip of the tube material to be stretched by welding, and the short tube is pulled out and inserted into a die. It is.

〔実施例〕〔Example〕

本発明の伸管方法を図面に従って工程順に説明すれば、
先ず、被伸管材ｌと同一径の短尺管２を予め用意しく図
中（イ））、該短尺管２の一方の端部を口付はロール（
図示せず）により口付は加工する（図中（ロ））。しか
るのち該短尺管２の他端側を前記伸管材１の先端に突き
合わせ（図中（ハ））その突き合わせ個所を溶接３する
（図中（ニ））。次いでその溶接部分のパリ取りを行な
い管外周面を平滑にしたのち（図中（ホ））、短尺管２
の口付は部側を先にして引き抜きダイス４に差し込み引
き抜く　（図中（へ））。The pipe drawing method of the present invention will be explained step by step according to the drawings.
First, a short tube 2 having the same diameter as the tube material 1 to be stretched is prepared in advance (in the figure (a)), and one end of the short tube 2 is rolled (
(not shown) to process the opening ((b) in the figure). Thereafter, the other end of the short tube 2 is butted against the tip of the elongated pipe material 1 ((c) in the figure), and the abutting portion is welded 3 ((d) in the figure). Next, after deburring the welded part and making the outer circumferential surface of the pipe smooth ((e) in the figure), short pipe 2
Insert the opening into the drawing die 4 with the part side first and pull it out ((f) in the figure).

本発明に係る伸管方法によれば伸管作業の能率が向上し
、製品歩留も良くなる。これを次表にて説明する。この
表に示した被伸管材はいずれもコイル状のものであるが
、先ず、作業能率の比較では本発明方法によれば段取り
工数（指数）が従来の約２割程減少される。これは本発
明では重量物たる被伸管材１に直接口付は加工しなくて
よいから被伸管材１を起こしたり、コイルの先端を巻き
解いてループを形成したりといった面倒がなくなること
によるものである。一方製品歩留も本発明方法によれば
略１００％近い数値が得られ、従来より著しく向上する
。これは本発明方法では短尺管２の部分がスクラップダ
ウンされるだけで被伸管材１の部分のほとんどが製品化
できることによるものである。According to the pipe drawing method according to the present invention, the efficiency of pipe drawing work is improved and the product yield is also improved. This is explained in the following table. All of the pipe materials to be stretched shown in this table are in the form of coils, and first, when comparing work efficiency, according to the method of the present invention, the number of setup steps (index) is reduced by about 20% compared to the conventional method. This is because in the present invention, there is no need to directly process the opening on the heavy stretched tube material 1, so there is no need to raise the stretched tube material 1 or unwind the tip of the coil to form a loop. It is. On the other hand, according to the method of the present invention, a value close to 100% can be obtained, which is significantly improved compared to the conventional method. This is because, in the method of the present invention, most of the portion of the tube material 1 to be stretched can be manufactured into a product by only scraping down the short tube 2 portion.

〔発明の効果〕〔Effect of the invention〕

伸管作業の段取り工数の軽減、並びに製品歩留の向上が
大幅に図られるものであり、例えば溶接用フラックスワ
イヤの製造等において作業性、経済性の面での利益は大
き〈産業上極めて有益なものである。This greatly reduces setup man-hours for pipe drawing work and improves product yield.For example, it has great benefits in terms of workability and economy in the production of flux wire for welding. It is something.

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

図面（イ）〜（へ）は本発明に係る伸管工程をその順に
示した縦断面図である。 ■・・・被伸管材、２・・・短尺管、３・・・溶接、４
・・・引き抜きダイス。 手続補正書 昭和６１年３月７日 特許庁長官　宇　賀　道　部　殿 ■、小事件表示 昭和６０年　　特許願第　２８２６１５　　号２、発明
の名称 管材の伸管方法 ３、補正をする者 事件との関係　　特許出願人 名称　大同特殊鋼株式会社 ４、代理人 ５、補正命令の日付　　　昭和６１年２月２５日６、補
正の対象 明細書中「図面の簡単な説明」の欄および図面。 ７、補正の内容Drawings (A) to (F) are longitudinal cross-sectional views showing the tube elongation process according to the present invention in that order. ■...Pipe material to be stretched, 2...Short pipe, 3...Welding, 4
...Drawing dice. Procedural amendment March 7, 1985 Mr. Michibe Uga, Commissioner of the Patent Office■, Small case indication 1985 Patent application No. 282615 2, Title of invention Method for stretching pipe materials 3, Person making the amendment Related Patent applicant name: Daido Steel Co., Ltd. 4, agent: 5, date of amendment order: February 25, 1985, 6: column of "Brief explanation of drawings" and drawings in the specification to be amended. 7. Contents of correction

Claims (1)

【特許請求の範囲】[Claims] 被伸管材と略同一径の短尺管の先端を予め口付け加工し
、被伸管材の先端に前記短尺管の基端を溶接により接合
し、該短尺管を引き抜きダイスへさし込むようにしたこ
とを特徴とする管材の伸管方法。The tip of a short tube having approximately the same diameter as the tube material to be stretched is pre-mouthed, the proximal end of the short tube is joined to the tip of the tube material to be stretched by welding, and the short tube is drawn out and inserted into a die. A method for stretching pipe material, characterized by: