JP3640535B2

JP3640535B2 - Locking structure and locking method for starting end of thin wire for welding to spool

Info

Publication number: JP3640535B2
Application number: JP20407198A
Authority: JP
Inventors: 俊一久保; 昇田村; 一雄河谷; 芳孝矢田貝
Original assignee: 日鐵住金溶接工業株式会社
Priority date: 1998-07-17
Filing date: 1998-07-17
Publication date: 2005-04-20
Anticipated expiration: 2018-07-17
Also published as: JP2000034063A

Description

【０００１】
【発明の属する技術分野】
本発明はスプールに溶接用細径ワイヤを巻き取る際のワイヤ始端部を、スプール胴部に係止するスプール巻溶接用細径ワイヤ始端部の係止構造およびその係止方法に関する。
【０００２】
【従来の技術】
ワイヤ径０．８〜２．０mmの細径溶接用ワイヤの場合、通常は約１０〜２０kgをスプールに自動的に巻き取って、その後の運搬、溶接などの作業を容易にできるようにしている。
【０００３】
このような溶接用細径ワイヤの巻き取り用スプールは、図７に示すように、円筒状のスプール胴部２には、円周方向に延びると共に、フランジ側面４に沿って開口するワイヤ係止孔５が設けられている。
【０００４】
このような構造において、ワイヤＷをスプール１に巻き取るには、まずワイヤの始端部を予め折り曲げてワイヤ係止孔５に差し込み、またはワイヤ係止孔５に差し込んで始端部をスプール胴部２裏面で折り曲げてスプール１に固定する。その後スプール１を回転させ、所定量のワイヤを複数層整列に巻き取る。ワイヤＷをスプール１に整列巻するには、最初の１巻分のワイヤＷがワイヤ係止孔５のある側のフランジ側面４、すなわちスプール胴部２とフランジ３で構成されるコーナーに押しつけられ接触するようにして巻き取りを開始しなければならない。
【０００５】
上記した整列巻状態で溶接用細径ワイヤをスプールに巻き取る方法として、特公平３−４０６４９号公報で開示された「線材の先端部をスプールに係止する巻き取り方法」がある。
この方法では、フランジに接するスプール胴部に、１辺がフランジに接して開口すると共に、巻き付け方向側に次第に狭まるＶ字形の開口を有するワイヤ係止孔を設け、このワイヤ係止孔内に先端部を予め折り曲げたワイヤを差し込んで引張ることにより、ワイヤ係止孔の特に前記Ｖ字形開口部にワイヤを挟み込ませると同時に、ワイヤ屈曲部を前記ワイヤ係止孔に引っかけて係止し、次いでスプールを回転して溶接用ワイヤを巻き取っている。
【０００６】
ワイヤを自動的に高能率に巻き取る場合のワイヤ始端部は、図８に示すようにスプール胴部２の周方向へＺ形に折り曲げる方法、図９に示すスプール胴部２の軸方向に折り曲げる方法が一般的である。しかし、これらは図１１に示すようにワイヤ始端部がワイヤ係止孔５に係止される前に、巻き取り開始の引張力であるバックテンションによってワイヤの折り曲げ部が開き、ワイヤ係止孔５から抜けて巻き取りができない場合があった。
【０００７】
また、確実にワイヤ始端部をワイヤ係止孔５に係止するために、図１０に示すＰ形に折り曲げる方法も提案されているが、折り曲げ加工の自動化が困難で、かつ鋼製外皮内にフラックスを充填したフラックス入りワイヤの場合は外皮が薄いので、急激な折り曲げ加工によって折り曲げ部から折れてしまいワイヤ始端部がワイヤ係止孔５から抜けて巻き取りができない場合があり、生産性に問題があった。
【０００８】
【発明が解決しようとする課題】
本発明は、スプール胴部に設けられたワイヤ係止孔へ、ワイヤ始端部の係止が簡便で、かつ確実にでき、巻き取り時にワイヤ係止孔から抜けることがなく整列巻することができるスプールへの溶接用細径ワイヤ始端部の係止構造および係止方法を提供することを目的とする。
【０００９】
【課題を解決するための手段】
上記目的を達成するために本発明は、以下の構成を要旨とする。
すなわち、本発明はスプールへの巻溶接用細径ワイヤ始端部の係止構造であり、
(１) スプールへ溶接用細径ワイヤ始端部を係止するに際し、スプール胴部に設けたワイヤ係止孔からスプール胴部裏面へワイヤ始端部所定長さを突出させた構造とし、該ワイヤ始端部をスプール軸方向にスプール胴部内面に沿って曲る第１屈曲部と、該第１屈曲部に次いでワイヤをスプール軸方向で、かつ第１屈曲部とは反対方向に曲げる第２屈曲部を形成したことを特徴とする。また、
(２) 上記 (１) において、第１屈曲部は屈曲角度θ1 を９０〜１４０°、第２屈曲部は屈曲半径Ｒを４〜１０mm、屈曲角度θ2 を６０〜１２０°とする。
【００１０】
また、本発明のスプールへの溶接用細径ワイヤ始端部の係止方法は、
(３) スプールへ溶接用細径ワイヤ始端部を係止する際に、スプール胴部に設けたワイヤ係止孔からスプール胴部裏面へワイヤ始端部を所定長さ突出させ、該突出ワイヤ先端を、ワイヤ係止孔の下部で、かつスプールのフランジ内面に設けた固定スリットに挿入した後、ワイヤ係止孔と固定スリット間で、スプールフランジ面外部からスプール胴部軸方向に進出する押し曲げピンで前記ワイヤ始端部を押してワイヤ係止孔下部を支点として第１屈曲部を形成しながら、ワイヤ係止孔下部および固定スリット縁を支点として押し曲げピンの先端部で第２屈曲部を形成することを特徴とする。また、
(４) 上記 (３) において、ワイヤ始端部の屈曲部形成に使用する押し曲げピンは、少なくともスプール胴部面側に傾斜角を有する楔形とし、かつ先端は曲面を形成したものであることを特徴とする。
【００１１】
【発明の実施の形態】
以下本発明を図面に基づいて詳細に説明する。
本発明は、図１に示すように、スプール胴部２に設けたワイヤ係止孔５からスプール胴部２裏面にワイヤ始端部所定長さを突出した構造とし、ワイヤ始端部は、第１屈曲部６をスプール軸方向にスプール胴部２内面に沿って曲げ、第１屈曲部６に次いでワイヤをスプール１の軸方向で、かつ第１屈曲部６と反対方向に曲げて第２屈曲部７として係止してあるので、ワイヤＷをスプールへ巻き取り開始時にワイヤ始端部がスプール胴部２裏面にＵ字形に接して大きな抵抗となり、バックテンションによって第１屈曲部６が多少開いても、ワイヤ係止孔５から抜けることがない。したがって、スプールへの溶接用細径ワイヤの整列巻が確実にできる。
【００１２】
ワイヤ始端部の形状は図２に示すように、第１屈曲部６の屈曲角度θ1 は１００〜１４０°とする。第１屈曲部６の屈曲角度θ1 が１００°未満であると、特にフラックス入りワイヤの場合鋼製外皮肉厚が薄いので第１屈曲部６で折れる場合があり、この場合ワイヤ始端部がワイヤ係止孔５から抜けて巻き取ることができない。第１屈曲部６の屈曲角度θ1 が１４０°を超えると、ワイヤＷの巻き取り開始時に図３に示すように第１屈曲部６がスプール胴部２表面に突出し、ワイヤＷはスプール胴部２に巻き取ることはできるが、巻層の上層部で乱巻きが生じて整列巻できないことがある。
【００１３】
第２屈曲部７は屈曲半径Ｒを４〜１０mmとし、屈曲角度θ2 は６０〜１２０°とする。屈曲半径Ｒが４mm未満であると、また第２屈曲部７の屈曲角度θ2 ６０°未満であると、フラックス入りワイヤの場合鋼製外皮肉厚が薄いので第２屈曲部７で折れる場合があり、ワイヤ係止孔５からワイヤ始端部が抜けて巻き取ることができない場合がある。第２屈曲部７の屈曲半径Ｒが１０mmを超えると、また第２屈曲部７の屈曲角度θ2 が１２０°を超えると、巻き取り開始時スプール胴部裏面に接したワイヤ始端部の抵抗が小さくなって、第１屈曲部６が多少開いた場合ワイヤ係止孔５から抜けて巻き取ることができない場合がある。また、第１屈曲部６がスプール胴部２表面に突出して巻層の上層部で乱巻きが生じる場合がある。
【００１４】
図４に本発明のスプール巻溶接用細径ワイヤ始端部の係止方法に用いる装置の一例を示す。また、図５に図４のＡ−Ａ′断面図を示す。
図中１０，１０′はスプール１を同軸に位置決め挟持して回転させる一対のホルダ、９は一方のホルダに軸方向すなわちスプール胴部２軸方向に形成した貫通孔１１を貫通してスプール胴部２内のワイヤ係止孔５近傍に突出し、ワイヤ始端部を押し曲げる押しピンである。８は押しピン９側のホルダ１０の内面に設置したワイヤ始端部が挿入される固定スリットである。
【００１５】
図６にスプール巻溶接用細径ワイヤ始端部の係止方法の概要図を示す。
まず、スプール胴部２のワイヤ係止孔５からスプール胴部２裏面へ、ワイヤ始端部を所定の長さで突出させ固定スリット８に挿入する。次いで、ワイヤ係止孔５と固定スリット８間のホルダ１０の貫通孔１１から押しピン９をスプール胴部２軸方向へ進出させてワイヤ始端部をスプール胴部２軸方向に押す。ワイヤ始端部はワイヤ係止孔５下部を支点として第１屈曲部６を形成しながらワイヤ係止孔５下部と固定スリット８上部の縁とを支点として押しピン９先端部でワイヤ係止孔５と固定スリット８間に第２屈曲部７を形成する。次いで押しピン９を貫通孔１１内に後退させ、スプール１を挟持したホルダ１０，１０′を回転してワイヤＷをスプール胴部２に巻き取りを開始する。
【００１６】
第１屈曲部に接する押しピン９は、スプール胴部２面側に楔形の傾斜面を有する。したがって、ワイヤ係止孔５下部を支点として第１屈曲部６は押しピン９が進出すると共に、徐々に押し曲げられる。押しピン９にスプール胴部２面側に傾斜面がない場合は、ワイヤ係止孔５下部で急激に押し曲げられるので、第１屈曲部で折れる場合があり、巻き取り開始時にワイヤ始端部がワイヤ係止孔５から抜けて巻き取ることができない。
なお、押しピン９の楔形の傾斜角度は１０〜３０°であることが好ましい。
【００１７】
また、押しピン９先端部は曲面を形成する形状とするのが好ましい。押しピン９先端部の形状が平面であると、第２屈曲部７で折れる場合があり、ワイヤ係止孔５からワイヤ始端部が抜けて巻き取ることができない場合があるからである。押しピン９先端部の幅は２〜５mmで、面取り加工または半径２〜７mmの曲面加工を施のがよい。
【００１８】
第２屈曲部７の曲げ角度θ2 は、固定スリット８とワイヤ係止孔５の距離、ワイヤ始端部の固定スリット８への挿入長さおよび固定スリット８の内径などを調整することにより決定される。
【００１９】
【実施例】
以下、実施例により本発明をさらに詳細に説明する。
図４に示す溶接用細径ワイヤの巻き取り装置を用いて、ワイヤ係止孔と固定スリットの距離、ワイヤ始端部の固定スリットへの挿入長さ、固定スリットの内径および押しピンの形状を種々変え、ワイヤ始端部の第１屈曲部の角度θ1 、第２屈曲部の屈曲半径Ｒおよび屈曲角度θ2 を各種変えてスプールの巻胴部に巻き取った。
【００２０】
溶接用ワイヤは、ＪＩＳＺ３３１３ＹＦＷ−Ｃ５０Ｄのワイヤ径１．２mmのフラックス入りワイヤを用いて、各スプールに１２．５kgずつ、それぞれ同一のワイヤ始端部形状で５０コイル巻き取った。各試験のワイヤ巻き取り開始時のスプール係止孔からの抜け数、乱巻きの発生数を調査した。それらの結果を表１に示す。
【００２１】
【表１】

【００２２】
表１の結果から明らかなように、本発明例である試験Ｎｏ．１〜６は、ワイヤ始端部の第１屈曲部が適度の角度でスプール軸方向にスプール胴部内面に沿って、また第２屈曲部が第１屈曲部と反対方向に適度の曲面と角度で曲げた構造となっているので、ワイヤの巻き取り開始時にワイヤ始端部がワイヤ係止孔から抜けることがなく、また第１屈曲部がスプール胴部表面に突出することもないので確実に整列巻きすることができた。
【００２３】
比較例中、試験Ｎｏ．７は、ワイヤ始端部の第１屈曲部の角度が小さいので、第１屈曲部で２コイル折れて巻き取り開始時にワイヤ係止孔からワイヤ始端部が抜けた。
試験Ｎｏ．８は、ワイヤ始端部の第１屈曲部の角度が大きいので、ワイヤ巻き取り開始時に第１屈曲部がスプール胴部表面に突出して３コイル巻層の上層部で乱巻きが生じた。
【００２４】
試験Ｎｏ．９は、ワイヤ始端部の第２屈曲部の屈曲半径が小さいので、第２屈曲部で１コイル折れて巻き取り開始時にワイヤ係止孔からワイヤ始端部が抜けた。
試験Ｎｏ．１０は、ワイヤ始端部の第２屈曲部の屈曲半径が大きいので、１コイル巻き取り開始時にワイヤ係止孔からワイヤ始端部が抜けた。また、２コイルワイヤ始端部の第１屈曲部がスプール胴部表面に突出して巻層の上層部で乱巻きが生じた。
【００２５】
試験Ｎｏ．１１は、ワイヤ始端部の第２屈曲部の屈曲角度が小さいので、第２屈曲部で１コイル折れて巻き取り開始時にワイヤ係止孔からワイヤ始端部が抜けた。
試験Ｎｏ．１２は、ワイヤ始端部の第２屈曲部の屈曲角度が大きいので、１コイル巻き取り開始時にワイヤ係止孔からワイヤ始端部が抜けた。また、３コイルワイヤ始端部の第１屈曲部がスプール胴部表面に突出して巻層の上層部で乱巻きが生じた。
試験Ｎｏ．１３は、押しピンに楔形の傾斜がないので、ワイヤ始端部の第１屈曲部で４コイル折れて巻き取り開始時にワイヤ係止孔からワイヤ始端部が抜けた。
【００２６】
【発明の効果】
以上のように、本発明のスプール巻溶接用細径ワイヤの係止構造および係止方法によれば、スプール胴部のワイヤ係止孔へのワイヤ始端部の係止が簡便で、かつ確実に係止でき、巻き取り時にワイヤ係止孔から抜けることがなく整列巻することができるようになった。
【図面の簡単な説明】
【図１】本発明のスプール巻溶接用細径ワイヤ始端部の係止構造を示す図である。
【図２】本発明のワイヤ始端部の屈曲状態を示す図である。
【図３】第１屈曲部がスプール胴部表面に突出した状態を示す図である。
【図４】本発明のスプール巻溶接用細径ワイヤ始端部の係止方法に用いる装置例を示す。
【図５】図４のＡ−Ａ′断面図を示す。
【図６】本発明のスプール巻溶接用ワイヤ始端部の係止方法の概要図を示す。
【図７】溶接用細径ワイヤの巻き取り開始時を示す図である。
【図８】従来のスプール巻溶接用細径ワイヤ始端部の係止構造を示す図である。
【図９】従来のスプール巻溶接用細径ワイヤ始端部の係止構造を示す図である。
【図１０】従来のスプール巻溶接用細径ワイヤ始端部の係止構造を示す図である。
【図１１】ワイヤ始端部がワイヤ係止孔から抜ける状態を示す図である。
【符号の説明】
１スプール
２スプール胴部
３フランジ
４フランジ側面
５ワイヤ係止孔
６第１屈曲部
７第２屈曲部
８固定スリット
９押しピン
１０，１０′ ホルダ
Ｗワイヤ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a locking structure and a locking method for a spool winding welding small-diameter wire starting end portion that locks a wire starting end portion when winding a welding thin-diameter wire around a spool to a spool body.
[0002]
[Prior art]
In the case of a small-diameter welding wire having a wire diameter of 0.8 to 2.0 mm, usually, about 10 to 20 kg is automatically wound on a spool so that subsequent operations such as transportation and welding can be facilitated. .
[0003]
As shown in FIG. 7, such a winding spool for winding a thin wire for wire is provided on a cylindrical spool body 2, which extends in the circumferential direction and opens along the flange side surface 4. A hole 5 is provided.
[0004]
In such a structure, in order to wind the wire W around the spool 1, first, the starting end portion of the wire is bent in advance and inserted into the wire locking hole 5, or inserted into the wire locking hole 5 and the starting end portion is connected to the spool body 2. Bend on the back and fix to spool 1. Thereafter, the spool 1 is rotated, and a predetermined amount of wire is wound into a plurality of layers. In order to wind the wire W around the spool 1, the first wire W is pressed against the flange side surface 4 on the side where the wire locking hole 5 is located, that is, the corner formed by the spool body 2 and the flange 3. The winding must be started in contact.
[0005]
As a method of winding the welding small diameter wire around the spool in the above-described aligned winding state, there is a “winding method for locking the tip end portion of the wire rod to the spool” disclosed in Japanese Patent Publication No. 3-40649.
In this method, a wire locking hole having a V-shaped opening gradually opening in the winding direction side and having one side in contact with the flange and opening in the winding direction is provided in the spool body that is in contact with the flange. By inserting and pulling a wire that has been bent in advance, the wire is held in the V-shaped opening of the wire locking hole, and at the same time, the wire bent portion is hooked and locked in the wire locking hole, and then spooled. The welding wire is wound up by rotating.
[0006]
When the wire is automatically wound with high efficiency, the wire start end portion is bent in the Z shape in the circumferential direction of the spool body 2 as shown in FIG. 8, and is bent in the axial direction of the spool body 2 as shown in FIG. The method is common. However, as shown in FIG. 11, before the wire start end portion is locked in the wire locking hole 5, the bent portion of the wire is opened by the back tension that is the tensile force for starting winding, and the wire locking hole 5. There was a case where it was not possible to take up and take up.
[0007]
Further, in order to securely lock the wire starting end portion in the wire locking hole 5, a method of bending into a P shape shown in FIG. 10 has also been proposed, but it is difficult to automate the bending process, and the steel outer shell is In the case of a flux-cored wire filled with flux, the outer skin is thin, so it may break from the bent part due to a sharp bending process, and the wire start end part may come out of the wire locking hole 5 and cannot be wound up. was there.
[0008]
[Problems to be solved by the invention]
According to the present invention, the wire start end can be easily and reliably locked into the wire locking hole provided in the spool body, and can be aligned and wound without being pulled out of the wire locking hole during winding. It is an object of the present invention to provide a locking structure and a locking method for a starting end portion of a thin wire for welding to a spool.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has the following structure.
That is, the present invention is a locking structure of the thin wire starting end for winding welding to the spool,
(1) When locking the welding thin wire start end to the spool, the wire start end has a predetermined length projecting from the wire locking hole provided in the spool barrel to the back of the spool barrel, and the wire start end A first bent portion that bends the portion in the spool axial direction along the inner surface of the spool body, and a second bent portion that bends the wire in the spool axial direction and in the direction opposite to the first bent portion following the first bent portion Is formed. Also,
(2) In the above (1), the first bent portion has a bending angle θ1 of 90 to 140 °, the second bent portion has a bending radius R of 4 to 10 mm, and a bending angle θ2 of 60 to 120 °.
[0010]
In addition, the method of locking the starting end of the thin wire for welding to the spool of the present invention,
(3) When the welding thin wire start end is locked to the spool, the wire start end protrudes from the wire locking hole provided in the spool body to the back surface of the spool body by a predetermined length, and the tip of the protruding wire is A push-bending pin that extends from the outside of the spool flange surface in the axial direction of the spool body between the wire locking hole and the fixed slit after being inserted into the fixed slit provided at the lower surface of the wire locking hole and on the inner surface of the spool flange Then, the first bent portion is formed with the lower portion of the wire locking hole as a fulcrum by pressing the wire start end portion, and the second bent portion is formed at the tip of the bending pin with the lower portion of the wire locking hole and the fixed slit edge as a fulcrum. It is characterized by that. Also,
(4) In the above (3), the push-bending pin used for forming the bent portion of the wire start end portion is a wedge shape having an inclination angle at least on the spool body surface side, and the tip is formed with a curved surface. Features.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings.
As shown in FIG. 1, the present invention has a structure in which a predetermined length of the wire start end portion protrudes from the wire locking hole 5 provided in the spool barrel portion 2 to the back surface of the spool barrel portion 2, and the wire start end portion is a first bent portion. The second bending portion 7 is formed by bending the portion 6 in the axial direction of the spool along the inner surface of the spool body 2 and bending the wire next to the first bending portion 6 in the axial direction of the spool 1 and in the direction opposite to the first bending portion 6. Therefore, when the wire W is started to be wound on the spool, the wire start end is in contact with the U-shape on the back surface of the spool body 2 and becomes a large resistance, and even if the first bent portion 6 is slightly opened by the back tension, It does not come out of the wire locking hole 5. Therefore, the aligned winding of the welding thin diameter wire around the spool can be ensured.
[0012]
As shown in FIG. 2, the shape of the wire start end is such that the bending angle θ1 of the first bent portion 6 is 100 to 140 °. If the bending angle θ1 of the first bent portion 6 is less than 100 °, especially in the case of a flux-cored wire, the outer shell thickness of the steel is thin, so that the first bent portion 6 may be broken. It cannot come out of the stop hole 5 and wind up. When the bending angle θ1 of the first bent portion 6 exceeds 140 °, the first bent portion 6 protrudes from the surface of the spool body 2 as shown in FIG. However, there are cases in which random winding occurs in the upper layer portion of the winding layer and alignment winding cannot be performed.
[0013]
The second bent portion 7 has a bending radius R of 4 to 10 mm and a bending angle θ2 of 60 to 120 °. If the bending radius R is less than 4 mm and the bending angle θ2 of the second bent portion 7 is less than 60 °, the flux-cored wire may be broken at the second bent portion 7 because the steel outer wall thickness is thin. In some cases, the wire start end portion may come off from the wire locking hole 5 and cannot be wound up. When the bending radius R of the second bent portion 7 exceeds 10 mm, and when the bent angle θ2 of the second bent portion 7 exceeds 120 °, the resistance of the wire start end in contact with the back surface of the spool body at the start of winding is small. Thus, when the first bent portion 6 is somewhat opened, it may be unable to come out of the wire locking hole 5 and take up. Moreover, the 1st bending part 6 protrudes on the spool trunk | drum 2 surface, and a turbulent winding may arise in the upper layer part of a winding layer.
[0014]
FIG. 4 shows an example of an apparatus used in the method for locking the starting end portion of the thin wire for spool winding welding according to the present invention. FIG. 5 is a sectional view taken along the line AA ′ of FIG.
In the figure, reference numerals 10 and 10 'denote a pair of holders for positioning and rotating the spool 1 coaxially, and 9 denotes a spool body through a through hole 11 formed in one of the holders in the axial direction, that is, the spool body 2 axial direction. 2 is a push pin that protrudes in the vicinity of the wire locking hole 5 in 2 and pushes and bends the wire start end. Reference numeral 8 denotes a fixed slit into which a wire start end portion installed on the inner surface of the holder 10 on the push pin 9 side is inserted.
[0015]
FIG. 6 shows a schematic diagram of a method of locking the starting end portion of the spool wire welding thin wire.
First, the wire start end protrudes from the wire locking hole 5 of the spool body 2 to the back surface of the spool body 2 with a predetermined length and is inserted into the fixed slit 8. Next, the push pin 9 is advanced from the through hole 11 of the holder 10 between the wire locking hole 5 and the fixed slit 8 in the spool barrel 2 axial direction, and the wire start end is pushed in the spool barrel 2 axial direction. The wire start hole is formed at the lower end of the wire locking hole 5 as a fulcrum, and the wire locking hole 5 is formed at the tip of the push pin 9 with the lower part of the wire locking hole 5 and the edge of the upper part of the fixing slit 8 as fulcrums And the second bent portion 7 is formed between the fixed slits 8. Next, the push pin 9 is retracted into the through hole 11, and the

holders

10 and 10 ′ holding the spool 1 are rotated to start winding the wire W around the spool body 2.
[0016]
The push pin 9 in contact with the first bent portion has a wedge-shaped inclined surface on the surface side of the spool body portion 2. Therefore, the first bent portion 6 is gradually pushed and bent as the push pin 9 advances with the lower portion of the wire locking hole 5 as a fulcrum. When the push pin 9 has no inclined surface on the surface side of the spool body portion 2, it is suddenly pushed and bent at the lower portion of the wire locking hole 5, so that it may be broken at the first bent portion, and the wire start end portion is It cannot come out of the wire locking hole 5 and wind up.
The wedge-shaped inclination angle of the push pin 9 is preferably 10 to 30 °.
[0017]
Moreover, it is preferable to make the front-end | tip part of the push pin 9 into the shape which forms a curved surface. This is because if the shape of the distal end portion of the push pin 9 is a flat surface, it may break at the second bent portion 7 and the wire start end portion may come off from the wire locking hole 5 and may not be wound. The width of the tip of the push pin 9 is 2 to 5 mm, and it is preferable to perform chamfering or curved surface processing with a radius of 2 to 7 mm.
[0018]
The bending angle θ2 of the second bent portion 7 is determined by adjusting the distance between the fixed slit 8 and the wire locking hole 5, the insertion length of the wire start end portion into the fixed slit 8, the inner diameter of the fixed slit 8, and the like. .
[0019]
【Example】
Hereinafter, the present invention will be described in more detail with reference to examples.
Using the winding device for a thin wire for welding shown in FIG. 4, various distances between the wire locking hole and the fixed slit, the insertion length of the wire start end to the fixed slit, the inner diameter of the fixed slit, and the shape of the push pin By changing the angle θ1 of the first bend at the wire start end, the bend radius R and the bend angle θ2 of the second bend, and wound around the spool body of the spool.
[0020]
As the welding wire, 12.5 kg of each coil was wound around each spool by using a flux-cored wire of JIS Z3313 YFW-C50D with a wire diameter of 1.2 mm, and each coil was wound with the same wire starting end shape. The number of pull-outs from the spool locking hole at the start of winding of the wire in each test and the number of occurrences of turbulent winding were investigated. The results are shown in Table 1.
[0021]
[Table 1]

[0022]
As is clear from the results in Table 1, test No. which is an example of the present invention. 1-6, the first bent portion of the wire starting end portion is at an appropriate angle along the spool body inner surface in the spool axis direction, and the second bent portion is at an appropriate curved surface and angle in the opposite direction to the first bent portion. Since it has a bent structure, the wire start end does not come out of the wire locking hole at the start of winding of the wire, and the first bent portion does not protrude from the surface of the spool body. We were able to.
[0023]
In the comparative examples, the test No. No. 7, since the angle of the first bent portion of the wire start end portion was small, two coils were bent at the first bend portion, and the wire start end portion was pulled out from the wire locking hole at the start of winding.
Test No. In No. 8, since the angle of the first bent portion at the wire start end was large, the first bent portion protruded from the surface of the spool body at the start of winding of the wire, and turbulent winding occurred in the upper layer portion of the three-coil winding layer.
[0024]
Test No. In No. 9, since the bending radius of the second bent portion of the wire start end portion was small, one coil was bent at the second bend portion, and the wire start end portion was removed from the wire locking hole at the start of winding.
Test No. No. 10, since the bending radius of the second bent portion of the wire start end was large, the wire start end slipped out of the wire locking hole at the start of winding of one coil. Moreover, the 1st bending part of the 2 coil wire start end part protruded on the spool trunk | drum surface, and the disorder | damage | failure winding occurred in the upper layer part of the winding layer.
[0025]
Test No. No. 11 has a small bending angle of the second bent portion of the wire start end portion, so that one coil was folded at the second bend portion and the wire start end portion was pulled out from the wire locking hole at the start of winding.
Test No. No. 12, since the bending angle of the second bent portion of the wire start end portion was large, the wire start end portion was removed from the wire locking hole at the start of winding of one coil. Moreover, the 1st bending part of the 3 coil wire start-end part protruded on the spool trunk | drum surface, and the random winding produced in the upper layer part of the winding layer.
Test No. In No. 13, since the push pin had no wedge-shaped inclination, four coils were bent at the first bent portion of the wire start end portion, and the wire start end portion was removed from the wire locking hole at the start of winding.
[0026]
【The invention's effect】
As described above, according to the locking structure and locking method for a spool winding welding thin wire according to the present invention, locking of the wire start end to the wire locking hole of the spool body is simple and reliable. It can be locked, and it can be aligned and wound without being pulled out of the wire locking hole during winding.
[Brief description of the drawings]
FIG. 1 is a view showing a locking structure of a starting end portion of a thin wire for spool winding welding according to the present invention.
FIG. 2 is a view showing a bent state of a wire start end portion of the present invention.
FIG. 3 is a view showing a state in which a first bent portion protrudes from a spool body surface.
FIG. 4 shows an example of an apparatus used in the method for locking a thin wire starting end portion for spool winding welding according to the present invention.
5 is a cross-sectional view taken along the line AA ′ of FIG.
FIG. 6 shows a schematic diagram of a method for locking a wire end for spool winding welding according to the present invention.
FIG. 7 is a diagram illustrating a winding start time of a thin wire for welding.
FIG. 8 is a view showing a conventional locking structure of a starting end portion of a thin wire for spool winding welding.
FIG. 9 is a view showing a conventional locking structure of a starting end portion of a thin wire for spool winding welding.
FIG. 10 is a view showing a conventional locking structure of the starting end portion of a thin wire for spool winding welding.
FIG. 11 is a diagram showing a state in which the wire start end is pulled out from the wire locking hole.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Spool 2 Spool trunk | drum 3 Flange 4 Flange side surface 5 Wire locking hole 6 1st bending part 7 2nd bending part 8 Fixing slit 9 Push pin 10, 10 'Holder W Wire

Claims

When locking the starting end of the thin wire for welding to the spool, a predetermined length of the wire starting end protrudes from the wire locking hole provided in the spool body to the back of the spool body, and the wire starting end is spooled. A first bent portion that bends along the inner surface of the spool body in the axial direction, and a second bent portion that bends the wire in the spool axial direction and in a direction opposite to the first bent portion, following the first bent portion. A structure for locking a starting end portion of a thin wire for welding to a spool.

2. The spool according to claim 1, wherein the first bent portion has a bent angle θ1 of 90 to 140 °, the second bent portion has a bent radius R of 4 to 10 mm, and a bent angle θ2 of 60 to 120 °. Locking structure of the starting end of a thin wire for welding.

When the welding thin wire start end is locked to the spool, the wire start end protrudes from the wire locking hole provided in the spool body to the back surface of the spool body by a predetermined length, and the tip of the protruding wire is connected to the wire engagement. After inserting into the fixed slit provided at the lower part of the stop hole and on the inner surface of the flange of the spool, the wire is pushed by a bending pin extending from the outside of the spool flange surface to the axial direction of the spool body between the wire locking hole and the fixed slit. The first bent portion is formed with the lower end of the wire locking hole as a fulcrum by pushing the start end portion, and the second bent portion is formed at the tip of the bending pin with the lower portion of the wire locking hole and the fixed slit edge as a fulcrum. The method for locking the starting end of the thin wire for welding to the spool.

4. A spool according to claim 3, wherein the push-bending pin used for forming the bent portion of the wire start end portion has a wedge shape having an inclination angle at least on the spool body surface side, and the tip has a curved surface. Method for locking the beginning end of the thin wire for welding to the wire.