JP2005254315A - Method for repairing sheet metal - Google Patents

Method for repairing sheet metal Download PDF

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JP2005254315A
JP2005254315A JP2004072281A JP2004072281A JP2005254315A JP 2005254315 A JP2005254315 A JP 2005254315A JP 2004072281 A JP2004072281 A JP 2004072281A JP 2004072281 A JP2004072281 A JP 2004072281A JP 2005254315 A JP2005254315 A JP 2005254315A
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sheet metal
drawer
flat portion
heated
heating
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JP3950452B2 (en
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Tetsuya Takei
哲也 武井
Hajime Yoshino
一 吉野
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YASHIMA KK
YASHIMA PRODUCTS
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YASHIMA KK
YASHIMA PRODUCTS
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Abstract

<P>PROBLEM TO BE SOLVED: To prevent the material of a sheet metal from deteriorating and a rustproof coating film coated on the back surface of the sheet metal from burning when repairing ( heating ) the sheet metal. <P>SOLUTION: A drawn-out flat part 4' is formed by drawing out washers which are welded to the surface of a concave part formed on the sheet metal 1. The surface of this drawn-out flat part 4' is heated within the range of 250-350°C by using a LPG torch taking propane gas or the like as a heat source. The drawn-out flat part 4' where is expanded by plastic deformation is contacted ( shrunk ) by rapidly cooling this heated drawn-out flat part 4' with cloth 8 wetted with water or the like. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、補修対象である板金の凹み部を板金の表面側から補修する板金補修方法に関する。   The present invention relates to a sheet metal repair method for repairing a recessed portion of a sheet metal to be repaired from the surface side of the sheet metal.

一般に、板金に凹み部等の損傷が生じた場合に、板金加工により補修することが行われている。例えば、外部からの衝撃力等により、ドアやボディ等の板金に凹み部が生じた場合、その凹み部を裏面側から打ち出して補修する方法がある。この場合、凹み部の裏側にある全ての部材を取り外して、裏側から板金用ハンマーを用いて凹み部を打ち出す必要があるため、補修部分の周囲にある打ち出しの邪魔になるパーツや裏側にある部材の取り外し及び補修後のパーツや部材の取付けに多大な手間がかかり、補修時間も長くかかってしまう。   In general, when a dent or the like is damaged in a sheet metal, the sheet metal is repaired. For example, when a dent is generated in a sheet metal such as a door or body due to an external impact force or the like, there is a method in which the dent is repaired by punching out from the back side. In this case, it is necessary to remove all the members on the back side of the dent part and punch out the dent part from the back side using a sheet metal hammer, so there are parts around the repaired part that disturb the launching and the members on the back side. It takes a lot of labor to attach parts and members after removal and repair, and the repair time also takes a long time.

このような不具合を解消するため、近年では、単相交流式もしくは三相整流式のコンデンサスタッド溶接機およびプーラーと呼ばれる引き出し用の専用工具を用いて凹み部を表面側から引き出して補修する引き出し板金工法が主流となっている（例えば、特許文献１参照）。この場合、補修部分である凹み部の周囲にある打ち出しの邪魔になるパーツ等の取り外し作業および取り付け作業を行う手間を省くことができるため、凹み部を裏面側から補修する場合に比べて作業性を高められる。
特開２００１−１１３３１５（段落００１６、図３） In order to eliminate such problems, in recent years, a single-phase AC type or three-phase rectification type capacitor stud welder and a pull-out sheet metal that is repaired by pulling out the dent from the surface side using a special pull-out tool called a puller. Construction methods have become mainstream (see, for example, Patent Document 1). In this case, it is possible to save the trouble of removing and installing parts around the dent, which is the repaired part, that hinders the launching, so workability is better than when repairing the dent from the back side. Can be enhanced.
JP 2001-113315 (paragraph 0016, FIG. 3)

ところで、前記特許文献１によれば、補修部分である凹み部を、引き出し用の専用工具を用いて表面側から引き出す方法を採用している。しかし、補修部分である凹み部は、外部からの衝撃力が加えられたときに、板金が延びて塑性変形することにより形成されることから、前記のように単に凹み部を引き出しただけでは、この引き出して平坦となった凹み部（以下、「引出し平坦部」という）の強度が低下してしまう。   By the way, according to the said patent document 1, the method of pulling out the dent part which is a repair part from the surface side using the exclusive tool for drawer | drawing-out is employ | adopted. However, since the recessed portion that is the repair portion is formed by plastic deformation by extending the sheet metal when an external impact force is applied, simply pulling out the recessed portion as described above, The strength of the recessed portion (hereinafter referred to as “drawer flat portion”) that has been flattened by the drawing is reduced.

そこで、従来では、前記のように延びていた引出し平坦部を、アセチレンガス等を用いて加熱した後、水で濡らした布等で加熱部分を急冷することにより、延びていた引出し平坦部を絞って（縮ませて）補修を行うようにしている。   Therefore, conventionally, the drawer flat portion that has been extended as described above is heated using acetylene gas or the like, and then the heated flat portion is quenched with a cloth wetted with water, thereby narrowing the extended flat portion of the drawer. (Shrink) to repair.

しかし、前記アセチレンガスの炎の温度は約２０００℃と鉄の融点（約１６００℃）よりも非常に高くなり、板金の材質を劣化させる等の二次損傷を引き起こす原因になるという問題がある。また、このように燃焼温度が高いアセチレンガスの炎を用いて板金を加熱すると、板金の裏面側に塗装された防錆用の塗装膜を燃焼させるという問題もある。即ち、アセチレンガスで板金を加熱すると、板金の温度が急激に上昇するため、熟練者でも、板金の加熱温度のコントロールが非常に難しく、板金の裏側に塗装された防錆用の塗装膜を焼いてしまうことがある。さらに、このように板金の裏面側の塗装膜が焼けると、再度板金の裏面側に塗装膜を塗布する必要があるが、板金の裏面側には塗装の邪魔になるパーツ等が存在するため、これらの取り外し作業および取り付け作業を行わなければならず、手間がかかる。また、これらのパーツを取り外さなければ防錆用の塗装膜の損傷は観察できないため、塗装膜を再度塗装せずにそのまま放置してしまうことがあり、錆びが発生する等の問題が生じていた。   However, the temperature of the acetylene gas flame is about 2000 ° C., which is much higher than the melting point of iron (about 1600 ° C.), which causes secondary damage such as deterioration of the sheet metal material. Moreover, when a sheet metal is heated using a flame of acetylene gas having a high combustion temperature in this way, there is a problem that a rust-preventing coating film coated on the back side of the sheet metal is burned. In other words, when the sheet metal is heated with acetylene gas, the temperature of the sheet metal rises rapidly, so even a skilled person can hardly control the heating temperature of the sheet metal, and the rust-proof coating film painted on the back side of the sheet metal is baked. May end up. Furthermore, when the coating film on the back side of the sheet metal is baked in this way, it is necessary to apply the coating film on the back side of the sheet metal again, but there are parts etc. that interfere with the coating on the back side of the sheet metal, These removal work and attachment work must be performed, which takes time. In addition, since damage to the coating film for rust prevention cannot be observed unless these parts are removed, the coating film may be left as it is without being painted again, causing problems such as rusting. .

本発明は、前記課題に鑑みて創案されたものであり、板金の補修時（加熱時）に、板金の材質を劣化させたり、板金の裏面側に塗装された防錆用の塗装膜を燃焼させたりするのを防止できるようにした板金補修方法を提供することを目的とする。   The present invention was devised in view of the above problems, and when a sheet metal is repaired (at the time of heating), the material of the sheet metal is deteriorated, or a coating film for rust prevention coated on the back side of the sheet metal is burned. An object of the present invention is to provide a sheet metal repair method capable of preventing the occurrence of such a problem.

前記課題に鑑み、本発明者らは、板金の加熱工程において、板金の温度を約２５０〜３５０℃と低く抑えても、板金の絞り効果が十分に得られること、また、このように板金の温度を約２５０〜３５０℃に設定した場合には、板金の裏面側に塗布される防錆用の塗装膜を溶融または燃焼させないこと等を見出し、本発明を完成した。   In view of the above problems, the inventors of the present invention can sufficiently obtain the sheet metal drawing effect even when the sheet metal temperature is kept low at about 250 to 350 ° C. When the temperature was set to about 250 to 350 ° C., it was found that the anticorrosion coating film applied to the back side of the sheet metal was not melted or burned, and the present invention was completed.

本発明は、前記課題を解決すべく構成されるものであり、請求項１に記載の発明は、補修対象である板金の凹み部のうち前記凹み部の表面側に塗布された塗装膜を除去する塗装膜除去工程と、前記板金の凹み部を表面側から引っ張ることにより前記凹み部を引き出して、引出し平坦部とする凹み部引出工程と、前記引出し平坦部をその表面温度が約２５０〜３５０℃になるまで加熱する加熱工程と、加熱された前記引出し平坦部を急冷してしぼる急冷しぼり工程とからなることを特徴とする板金補修方法である。   This invention is comprised so that the said subject may be solved, and invention of Claim 1 removes the coating film apply | coated to the surface side of the said recessed part among the recessed parts of the sheet metal which is repair object A paint film removing step, a dent portion drawing step of pulling out the dent portion by pulling the dent portion of the sheet metal from the surface side to make a drawer flat portion, and a surface temperature of the drawer flat portion of about 250 to 350. A sheet metal repairing method comprising: a heating step of heating to a temperature of ° C; and a quenching and squeezing step of quenching and squeezing the heated flat portion of the drawer.

請求項１に記載の発明によれば、凹み部引出工程で引き出された板金の引出し平坦部を、加熱工程で表面温度が約２５０〜３５０℃になるまで加熱したので、延びた引出し平坦部を確実に絞ることができる。しかも、板金の引出し平坦部を表面側から約２５０〜３５０℃で加熱したことにより、板金の裏面側に塗布された防錆用の塗装膜が溶融または燃焼するのを防止できる。   According to the first aspect of the present invention, the drawn flat portion of the sheet metal drawn in the recess drawing step is heated until the surface temperature becomes about 250 to 350 ° C. in the heating step. It can be squeezed reliably. In addition, by heating the flat portion of the sheet metal at about 250 to 350 ° C. from the front side, it is possible to prevent the rust-proof coating film applied to the back side of the sheet metal from melting or burning.

請求項２に記載の発明は、加熱工程では、引出し平坦部の表面をプロパンガスまたはブタンガスを用いて加熱することを特徴とする請求項１に記載の板金補修方法である。   The invention according to claim 2 is the sheet metal repair method according to claim 1, wherein, in the heating step, the surface of the drawer flat portion is heated using propane gas or butane gas.

請求項２に記載の発明によれば、凹み部引出工程で引き出された板金の引出し平坦部を、プロパンガスまたはブタンガスを用いて加熱することにより、この引出し平坦部の表面温度を約２５０〜３５０℃に容易に設定することができる。即ち、プロパンガスまたはブタンガスの炎の温度は約１２００℃であり、アセチレンガスに比べて十分に低く抑えられるため、引出し平坦部の表面温度のコントロールが容易であり、熟練者以外の作業者でも前記表面温度を約２５０〜３５０℃に簡単に設定できる。また、プロパンガスまたはブタンガスを用いて引出し平坦部の表面温度を２５０〜３５０℃に加熱した場合の引出し平坦部の裏面温度は１２０℃以下に抑えられ、防錆用の塗装膜の溶融温度には達することはない。なお、自動車の防錆塗装に使用されている一般的な塗料は、例えば、ウレタン系アクリル樹脂、ウレタン系ポリエステル樹脂、熱硬化型ポリエステル樹脂等からなり、その溶融温度は１２０℃程度である。   According to invention of Claim 2, the surface temperature of this drawer | drawing flat part is about 250-350 by heating the drawer | drawing flat part of the sheet metal pulled out by the dent part extraction process using propane gas or butane gas. Can be easily set to ° C. That is, the temperature of the flame of propane gas or butane gas is about 1200 ° C., which is sufficiently lower than that of acetylene gas, so that it is easy to control the surface temperature of the drawer flat part. The surface temperature can be easily set to about 250-350 ° C. In addition, when the surface temperature of the flat portion of the drawer is heated to 250 to 350 ° C. using propane gas or butane gas, the back surface temperature of the flat portion of the drawer is suppressed to 120 ° C. or less, and the melting temperature of the coating film for rust prevention is Never reach. In addition, the common coating material used for the antirust coating of a motor vehicle consists of urethane type acrylic resin, urethane type polyester resin, thermosetting polyester resin, etc., for example, The melting temperature is about 120 degreeC.

請求項３に記載の発明は、加熱工程を行う際には、所定温度に達すると色が変化するかまたは溶ける塗料を予め前記引出し平坦部に塗布しておくことを特徴とする請求項１または請求項２に記載の板金補修方法である。   The invention according to claim 3 is characterized in that, when the heating step is performed, a paint whose color changes or melts when a predetermined temperature is reached is previously applied to the drawer flat portion. A sheet metal repair method according to claim 2.

請求項３に記載の発明によれば、引出し平坦部に塗料を塗布することにより、引出し平坦部が所定温度（例えば３００℃）に達したか否かを判定することができ、引出し平坦部の温度管理を容易に行うことができる。   According to the third aspect of the present invention, it is possible to determine whether or not the drawer flat portion has reached a predetermined temperature (for example, 300 ° C.) by applying the paint to the drawer flat portion. Temperature management can be easily performed.

請求項４に記載の発明は、塗装膜除去工程を行った後には、コンデンサスタッド溶接機を用いてワッシャを板金の凹み部に溶接するワッシャ溶接工程を行い、前記ワッシャに引掛具を引っ掛けて引っ張ることにより凹み部引出工程を行うことを特徴とする請求項１ないし請求項３のいずれか１項に記載の板金補修方法である。   In the invention according to claim 4, after performing the paint film removing process, a capacitor stud welding machine is used to perform a washer welding process in which a washer is welded to the recessed portion of the sheet metal, and a hook is hooked on the washer and pulled. 4. The sheet metal repair method according to claim 1, wherein the step of pulling out the recessed portion is performed.

請求項４に記載の発明によれば、コンデンサスタッド溶接機を用いることで、ワッシャを板金の凹み部に短時間（例えば２／１０００秒）で強固に溶接することができる。また、このコンデンサスタッド溶接機は、大きな電流を一瞬のうちに通電させることから、板金の裏面側が高温となることがなく、裏焼けを防止することができる。また、このコンデンサスタッド溶接機を用いることによりワッシャの焼けひずみがなくなり、同一のワッシャを繰り返し何回でも使用することができる。さらに、凹み部引出工程において、プーラー等の引掛具を引っ掛けて引っ張ることにより、凹み部を作業者の手作業で簡単に引き出すことができる。   According to invention of Claim 4, a washer can be firmly welded to the recessed part of a sheet metal in a short time (for example, 2/1000 second) by using a capacitor stud welding machine. In addition, since this capacitor stud welding machine energizes a large current in an instant, the back side of the sheet metal does not become hot, and back burn can be prevented. In addition, by using this capacitor stud welding machine, the burnout distortion of the washer is eliminated, and the same washer can be used any number of times. Furthermore, in a dent part extraction | drawer process, a dent part can be easily pulled out by an operator's manual work by hooking and pulling hooking tools, such as a puller.

本発明によれば、加熱工程において板金の引出し平坦部をその表面側から約２５０〜３５０℃の範囲内で加熱したので、塑性変形で延びた引出し平坦部を確実に絞る（縮ませる）ことができると共に、板金の裏面側に塗布される防錆用の塗装膜が燃焼するのを防止でき、板金の品質を高めることができる。また、凹み部引出工程で引き出された板金の引出し平坦部を、プロパンガスまたはブタンガスを用いて加熱することにより、この引出し平坦部の加熱温度を約２５０〜３５０℃に容易に設定することができ、熟練者以外の作業者でも作業を簡単に行うことができる。また、引出し平坦部に温度管理用の塗料を塗布することにより、引出し平坦部が所定温度に達したか否かを判定することができ、引出し平坦部の温度管理を容易に行うことができる。さらに、コンデンサスタッド溶接機により、ワッシャを板金の凹み部に短時間で強固に溶接することができる。また、このコンデンサスタッド溶接機を用いることによりワッシャの焼けひずみがなく、同一のワッシャを繰り返し何回でも使用でき、コストを削減することができる。   According to the present invention, since the drawer flat portion of the sheet metal is heated within the range of about 250 to 350 ° C. from the surface side in the heating step, the drawer flat portion extended by plastic deformation can be reliably squeezed (shrinked). In addition, it is possible to prevent the coating film for rust prevention applied to the back side of the sheet metal from burning, and to improve the quality of the sheet metal. In addition, by heating the flat portion of the sheet metal drawn in the dent portion drawing step using propane gas or butane gas, the heating temperature of the flat portion of the drawer can be easily set to about 250 to 350 ° C. Even an operator other than an expert can easily perform the operation. Further, by applying a temperature control paint to the drawer flat portion, it can be determined whether or not the drawer flat portion has reached a predetermined temperature, and the temperature management of the drawer flat portion can be easily performed. Further, the washer can be firmly welded to the recessed portion of the sheet metal in a short time by the capacitor stud welding machine. Further, by using this capacitor stud welding machine, there is no burning distortion of the washer, and the same washer can be used any number of times, and the cost can be reduced.

以下、添付図面を参照して、本発明の実施の形態を詳細に説明する。図１は本実施の形態に係る板金の断面図で、図２ないし図６は本実施の形態に係る板金補修方法の各工程を示す断面図である。   Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of a sheet metal according to the present embodiment, and FIGS. 2 to 6 are cross-sectional views showing respective steps of the sheet metal repair method according to the present embodiment.

まず、板金の構成について説明する。図１に示すように符号「１」は本実施の形態に用いる板金を示している。この板金１は、高張力鋼板等の鉄板からなり、例えば自動車のボディやドアに用いられる。なお、この高張力鋼板は、焼き入れが施されているため、６００℃程度の熱を加えると、焼き戻されてしまい、材質の劣化が生じるものである。また、この板金１の板厚は、一般に軽自動車で０．５ｍｍ程度、軽自動車以外の乗用車で０．７〜０．８ｍｍ程度に設定されている。   First, the configuration of the sheet metal will be described. As shown in FIG. 1, reference numeral “1” indicates a sheet metal used in the present embodiment. The sheet metal 1 is made of an iron plate such as a high-tensile steel plate, and is used, for example, for an automobile body or door. In addition, since this high-tensile steel plate is quenched, when heat of about 600 ° C. is applied, it is tempered and the material is deteriorated. The sheet thickness of the sheet metal 1 is generally set to about 0.5 mm for a light vehicle and about 0.7 to 0.8 mm for a passenger vehicle other than a light vehicle.

また、板金１の表面側には塗装膜２が全面に亘って塗布されると共に、板金１の裏面側には、防錆用の塗装膜３が全面に亘って塗布されている。なお、この防錆用の塗装膜３は、融点が約１２０℃となっている。   A coating film 2 is applied to the entire surface of the sheet metal 1, and a coating film 3 for rust prevention is applied to the entire back surface of the sheet metal 1. The anticorrosive coating film 3 has a melting point of about 120 ° C.

そして、図１に示すように、この板金１には、外部からの衝撃力が加えられることにより、補修対象である断面コ字状の凹み部４が形成されている。この凹み部４は、前記衝撃時に板金１が塑性変形して延びることにより形成され、側壁４Ａと底部４Ｂとを有している。   As shown in FIG. 1, a concave portion 4 having a U-shaped cross section to be repaired is formed on the sheet metal 1 by applying an impact force from the outside. The recess 4 is formed by extending the sheet metal 1 by plastic deformation at the time of impact, and has a side wall 4A and a bottom 4B.

次に、本実施の形態に係る板金補修方法について図２ないし図６を参照して説明する。
まず、図２に示すように、補修対象である板金１の凹み部４のうち、側壁４Ａの表面側および底部４Ｂの表面側に塗布された塗装膜２（図１参照）を除去する（塗装膜除去工程） Next, a sheet metal repair method according to the present embodiment will be described with reference to FIGS.
First, as shown in FIG. 2, the coating film 2 (see FIG. 1) applied to the surface side of the side wall 4 </ b> A and the surface side of the bottom portion 4 </ b> B is removed from the recessed portion 4 of the sheet metal 1 to be repaired (painting). Film removal process)

次に、板金１の凹み部４のうち底部４Ｂの表面側にコンデンサスタッド溶接機（図示せず）を用いて例えば２個のワッシャ５，５を溶接する（ワッシャ溶接工程）。このコンデンサスタッド溶接機は、コンデンサの放電エネルギを使用するため、溶接時の通電時間が約２／１０００秒と非常に短く抑えられる。従って、各ワッシャ５と底部４Ｂとの間の溶接部（図示せず）に焼けが生じるおそれがまったくない。また、板金１の裏面側の塗装膜３（融点約３５０℃）が溶けるおそれもまったくない。しかも、このコンデンサスタッド溶接機は、１００００Ａ前後の大電流を約２／１０００秒の間に一度に流すため、各ワッシャ５の溶接力を非常に高めることができる。   Next, for example, two washers 5 and 5 are welded to the surface side of the bottom portion 4B of the recessed portion 4 of the sheet metal 1 using a capacitor stud welder (not shown) (washer welding step). Since this capacitor stud welding machine uses the discharge energy of the capacitor, the energization time during welding can be suppressed to a very short time of about 2/1000 seconds. Therefore, there is no possibility that the welded portion (not shown) between each washer 5 and the bottom portion 4B will be burnt. Further, there is no possibility that the coating film 3 (melting point: about 350 ° C.) on the back side of the sheet metal 1 is melted. In addition, since this capacitor stud welding machine allows a large current of about 10,000 A to flow at a time in about 2/1000 seconds, the welding force of each washer 5 can be greatly increased.

次に、図３中の仮想線で示したプーラーと呼ばれる引き出し用の専用工具である引掛具６，６を、凹み部４の表面側に溶接した各ワッシャ５にそれぞれ引っ掛ける。そして、引掛具６を矢示Ａ方向に引っ張ることにより、凹み部４を引き出して平らに加工し、図４に示す引出し平坦部４′を形成する（凹み部引出工程）。   Next, hooking tools 6 and 6 which are exclusive tools for pulling called pullers indicated by phantom lines in FIG. 3 are respectively hooked on the washers 5 welded to the surface side of the recess 4. Then, by pulling the hooking tool 6 in the direction indicated by the arrow A, the recessed portion 4 is pulled out and processed into a flat shape to form a drawn flat portion 4 ′ shown in FIG. 4 (recessed portion drawing step).

そして、次に、図５に示すように引出し平坦部４′を、プロパンガスを熱源としたＬＰＧトーチ７を用いて、引出し平坦部４′の表面側から約２５０〜３５０℃、好ましくは２５０〜３００℃の範囲内で加熱する（加熱工程）。ここで、引出し平坦部４′の加熱温度が３５０℃を超えると、引出し平坦部４′の裏面側に塗布した防錆用の塗装膜３が溶け易くなるという不具合が生じる。一方、引出し平坦部４′の加熱温度が２５０℃よりも低くなると、引出し平坦部４′を加熱したことによる絞り効果が十分に得られないという不具合が生じる。   Then, as shown in FIG. 5, the drawer flat part 4 ′ is about 250 to 350 ° C., preferably 250 to 350 ° C. from the surface side of the drawer flat part 4 ′ using an LPG torch 7 using propane gas as a heat source. Heat within a range of 300 ° C. (heating step). Here, when the heating temperature of the drawer flat portion 4 ′ exceeds 350 ° C., there arises a problem that the anticorrosive coating film 3 applied to the back surface side of the drawer flat portion 4 ′ is easily melted. On the other hand, when the heating temperature of the drawer flat portion 4 ′ is lower than 250 ° C., there is a problem that the drawing effect due to heating of the drawer flat portion 4 ′ cannot be sufficiently obtained.

また、引出し平坦部４′を前記のように加熱する際には、所定温度（例えば約３００℃）に達すると色が変化するかまたは溶ける塗料を、予め引出し平坦部４′に塗布しておくようにする。なお、所定温度に達すると色が変化する塗料としては、テンピルスティック等のサーモセンサが挙げられる。   Further, when the drawer flat part 4 'is heated as described above, a paint whose color changes or melts when reaching a predetermined temperature (for example, about 300 ° C) is previously applied to the drawer flat part 4'. Like that. Examples of the paint that changes color when it reaches a predetermined temperature include a thermosensor such as a tempil stick.

次に、図５に示すように、加熱された引出し平坦部４′を水で濡らした布８等を用いて急冷することにより、延びていた引出し平坦部４′を絞る（急冷絞り工程）。   Next, as shown in FIG. 5, the drawn flat portion 4 ′ is squeezed by quenching the heated drawn flat portion 4 ′ with a cloth 8 or the like wetted with water (quenching drawing step).

そして、最後に図６に示すように、前記塗装膜除去工程で除去した塗装膜２を引出し平坦部４′の表面に塗装して仕上げる（仕上げ工程）。   Finally, as shown in FIG. 6, the paint film 2 removed in the paint film removal process is applied to the surface of the drawn flat portion 4 'and finished (finishing process).

このような板金補修方法によれば、加熱工程において、板金１の引出し平坦部４′をその表面側から約２５０〜３５０℃の範囲内で加熱したので、塑性変形して延びた板金１の引出し平坦部４′を確実に絞る（縮ませる）ことができる。また、このように、板金１の引出し平坦部４′を３５０℃以下で加熱したので、引出し平坦部４′の裏面側が１２０℃以上に加熱されることがなくなり、引出し平坦部４′の裏面側に塗布される防錆用の塗装膜３が溶融するのを防止でき、補修した板金１の品質を確実に高めることができる。   According to such a sheet metal repair method, in the heating process, the drawer flat portion 4 ′ of the sheet metal 1 is heated within the range of about 250 to 350 ° C. from the surface side. The flat portion 4 ′ can be reliably squeezed (shrinked). Further, since the drawer flat part 4 'of the sheet metal 1 is heated at 350 ° C or lower in this way, the back side of the drawer flat part 4' is not heated to 120 ° C or higher, and the back side of the drawer flat part 4 'is not heated. It is possible to prevent the rust-proof coating film 3 applied to the metal from being melted, and to reliably improve the quality of the repaired sheet metal 1.

また、プロパンガスを熱源として板金１の引出し平坦部４′を加熱するようにしたので、引出し平坦部４′の加熱温度を約２５０〜３５０℃の範囲内に容易に抑えることができ、熟練者以外の作業者でも、引出し平坦部４′の温度管理を簡単に行うことができる。   Further, since the drawer flat part 4 'of the sheet metal 1 is heated using propane gas as a heat source, the heating temperature of the drawer flat part 4' can be easily suppressed within a range of about 250 to 350 ° C. Other operators can easily manage the temperature of the drawer flat portion 4 '.

また、加熱工程において、引出し平坦部４′に温度管理用の塗料を塗布することにより、引出し平坦部４′が所定温度（例えば約３００℃）に達したか否かを判定することができ、引出し平坦部４′の温度管理を一層容易に行うことができる。   Further, in the heating process, it is possible to determine whether or not the drawer flat portion 4 ′ has reached a predetermined temperature (for example, about 300 ° C.) by applying a temperature control paint to the drawer flat portion 4 ′. The temperature control of the drawer flat part 4 'can be performed more easily.

なお、プロパンガスの燃焼温度は、約１２００℃であり、鉄の融点（約１６００℃）よりも十分に低く抑えられ、板金１の材質を劣化させる等の二次損傷が生じるのを防止することができる。また、高張力鋼板等を板金１に用いた場合でも、板金１の加熱温度を約２５０〜３００℃に設定できることにより、板金１の加熱温度が板金１の焼き戻し温度（約６００℃）に到達することがなくなり、これによっても板金１の材質劣化を防止でき、その品質を高く維持することができる。   The combustion temperature of propane gas is about 1200 ° C., which is sufficiently lower than the melting point of iron (about 1600 ° C.), and prevents secondary damage such as deterioration of the material of the sheet metal 1. Can do. Even when a high-tensile steel plate or the like is used for the sheet metal 1, the heating temperature of the sheet metal 1 reaches the tempering temperature (about 600 ° C.) of the sheet metal 1 because the heating temperature of the sheet metal 1 can be set to about 250 to 300 ° C. As a result, the material deterioration of the sheet metal 1 can be prevented and the quality can be maintained high.

なお、本実施の形態では、加熱工程において、板金１の引出し平坦部４′をプロパンガスを用いて加熱する場合を例に挙げて説明したが、本発明はこれに限ることなく、例えば、ブタンガス等を用いて加熱してもよい。   In the present embodiment, the case where the drawer flat portion 4 ′ of the sheet metal 1 is heated using propane gas in the heating process has been described as an example. However, the present invention is not limited to this, but for example, butane gas You may heat using etc.

また、本実施の形態では、板金１を鋼板を用いて形成する場合を例に挙げて説明したが、本発明はこれに限ることなく、例えば板金１をアルミ合金等で形成してもよい。   Further, in the present embodiment, the case where the sheet metal 1 is formed using a steel plate has been described as an example. However, the present invention is not limited thereto, and the sheet metal 1 may be formed of, for example, an aluminum alloy.

さらに、本実施の形態では、凹み部引出工程において、ワッシャ５に引掛具６を直接引っ掛けて引き出す方法を採用しているが、本発明はこれに限ることなく、直接、間接を問わず、例えば各ワッシャ５に棒状の部材等を通してこれに引掛部６を引っ掛けて引き出すようにしてもよい。   Furthermore, in the present embodiment, the method of directly pulling the hooking tool 6 to the washer 5 and pulling it out is adopted in the dent portion pulling step, but the present invention is not limited to this, for example, directly or indirectly, for example, You may make it draw out by hooking the hook part 6 to each washer 5 through a rod-shaped member etc. in this.

本発明の実施の形態に係る板金に凹み部が設けられた状態を断面図である。It is sectional drawing in the state by which the recessed part was provided in the sheet metal which concerns on embodiment of this invention. 本発明の実施の形態に係る塗装膜除去工程を示す断面図である。It is sectional drawing which shows the coating film removal process which concerns on embodiment of this invention. 本発明の実施の形態に係るワッシャ溶接工程および凹み部引出工程を示す断面図である。It is sectional drawing which shows the washer welding process and recessed part extraction process which concern on embodiment of this invention. 本発明の実施の形態に係る凹み部引出工程を行った後の板金の状態を示す断面図である。It is sectional drawing which shows the state of the sheet metal after performing the recessed part extraction | drawer process which concerns on embodiment of this invention. 本発明の実施の形態に係る加熱工程および急冷しぼり工程を示す断面図である。It is sectional drawing which shows the heating process and quenching squeezing process which concern on embodiment of this invention. 本発明の実施の形態に係る仕上げ工程を示す断面図である。It is sectional drawing which shows the finishing process which concerns on embodiment of this invention.

符号の説明Explanation of symbols

１ 板金
２，３ 塗装膜
４ 凹み部
４′ 引出し平坦部
５ ワッシャ
６ 引掛具
７ ＬＰＧトーチ DESCRIPTION OF SYMBOLS 1 Sheet metal 2,3 Paint film 4 Recessed part 4 'Drawer flat part 5 Washer 6 Hook 7 LPG torch

Claims (4)

補修対象である板金の凹み部のうち前記凹み部の表面側に塗布された塗装膜を除去する塗装膜除去工程と、
前記板金の凹み部を表面側から引っ張ることにより前記凹み部を引き出して、引出し平坦部とする凹み部引出工程と、
前記引出し平坦部をその表面温度が約２５０〜３５０℃になるまで加熱する加熱工程と、
加熱された前記引出し平坦部を急冷してしぼる急冷しぼり工程とからなることを特徴とする板金補修方法。 A coating film removing step of removing a coating film applied to the surface side of the concave portion of the concave portion of the sheet metal to be repaired;
A step of pulling out the concave portion by pulling the concave portion of the sheet metal from the front surface side to make a flat portion of the drawer;
A heating step of heating the drawer flat part until its surface temperature is about 250 to 350 ° C .;
A sheet metal repairing method comprising a quenching and squeezing step of quenching and squeezing the heated flat portion of the drawer. 前記加熱工程では、前記引出し平坦部の表面をプロパンガスまたはブタンガスを用いて加熱することを特徴とする請求項１に記載の板金補修方法。   The sheet metal repair method according to claim 1, wherein in the heating step, the surface of the drawer flat portion is heated using propane gas or butane gas. 前記加熱工程を行う際には、所定温度に達すると色が変化するかまたは溶ける塗料を予め前記引出し平坦部に塗布しておくことを特徴とする請求項１または請求項２に記載の板金補修方法。   3. The sheet metal repair according to claim 1, wherein when the heating step is performed, a paint whose color changes or melts when a predetermined temperature is reached is applied in advance to the drawer flat portion. Method. 前記塗装膜除去工程を行った後には、コンデンサスタッド溶接機を用いてワッシャを前記板金の凹み部に溶接するワッシャ溶接工程を行い、前記ワッシャに引掛具を引っ掛けて引っ張ることにより前記凹み部引出工程を行うことを特徴とする請求項１ないし請求項３のいずれか１項に記載の板金補修方法。   After performing the paint film removing step, a washer welding step is performed in which a washer is welded to the concave portion of the sheet metal using a capacitor stud welding machine, and the concave portion pulling step is performed by hooking and pulling a hook on the washer. The sheet metal repair method according to claim 1, wherein the sheet metal repair method is performed.
JP2004072281A 2004-03-15 2004-03-15 Sheet metal repair method Expired - Fee Related JP3950452B2 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008100153A (en) * 2006-10-18 2008-05-01 Yashima:Kk Sheet metal repairing structure of high tensile steel sheet and sheet metal repairing method
WO2008053639A1 (en) * 2006-10-31 2008-05-08 Dengen Co., Ltd. Jig for repairing metal sheet, device for repairing metal sheet using the same and method of repairing metal sheet
CN106623497A (en) * 2016-12-27 2017-05-10 英辉南方造船（广州番禺）有限公司 Technical method for eliminating local deformation by argon tungsten-arc welding heating

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008100153A (en) * 2006-10-18 2008-05-01 Yashima:Kk Sheet metal repairing structure of high tensile steel sheet and sheet metal repairing method
JP4638400B2 (en) * 2006-10-18 2011-02-23 株式会社ヤシマ Sheet metal repair structure and sheet metal repair method for high-tensile steel sheet
WO2008053639A1 (en) * 2006-10-31 2008-05-08 Dengen Co., Ltd. Jig for repairing metal sheet, device for repairing metal sheet using the same and method of repairing metal sheet
JPWO2008053639A1 (en) * 2006-10-31 2010-02-25 デンゲン株式会社 Sheet metal repair jig, sheet metal repair apparatus using the same, and sheet metal repair method
JP5101517B2 (en) * 2006-10-31 2012-12-19 デンゲン株式会社 Sheet metal repair method
CN106623497A (en) * 2016-12-27 2017-05-10 英辉南方造船（广州番禺）有限公司 Technical method for eliminating local deformation by argon tungsten-arc welding heating

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