JP4600873B2

JP4600873B2 - Method for manufacturing painted metal parts using welding

Info

Publication number: JP4600873B2
Application number: JP2009025418A
Authority: JP
Inventors: 道博奥田
Original assignee: Honda Access Corp
Current assignee: Honda Access Corp
Priority date: 2008-02-20
Filing date: 2009-02-05
Publication date: 2010-12-22
Anticipated expiration: 2029-02-05
Also published as: CN101513700A; JP2009220177A

Description

本発明は、金属部品同士を溶接するに際して、溶接した金属部品の錆防止効果が得られる溶接を用いた塗装金属部品の製造方法に関するものである。 The present invention relates to a method of manufacturing a painted metal part using welding that can obtain a rust prevention effect of the welded metal parts when the metal parts are welded to each other.

従来、車両などにおいて、金属部品同士を接合する方法として、リベット止めが知られており、通常、金属部品に塗装又は鍍金を施した後、リベットを加締ることにより金属部品同士を接合している（例えば特許文献１）。 Conventionally, riveting is known as a method for joining metal parts in vehicles and the like. Usually, after metal parts are painted or plated, the metal parts are joined by crimping the rivets. (For example, Patent Document 1).

しかし、リベットを用いた場合、リベットの頭部が露出して外観を損なったり、その頭部の逃げが必要になったりして制約を受け、使用できない場合がある。 However, when a rivet is used, the head of the rivet may be exposed to impair the appearance of the head, or the head may need to be escaped.

一方、金属部品同士の溶接では、上述したような制約は受けないが、溶接箇所の錆止め処理が難しく、溶接後、露出部分を塗装するだけでは、溶接箇所に雨水などが侵入して経時的に錆による雨だれ跡が発生するなどの問題がある。 On the other hand, welding between metal parts is not subject to the above-mentioned restrictions, but it is difficult to prevent rusting at the welded part. After welding, just painting the exposed part causes rainwater to enter the welded part over time. There are problems such as raindrops caused by rust.

このような問題に対して、鉄板に、熱可塑性樹脂および導電性短繊維から成る樹脂膜を形成し、樹脂膜以外の部分に電着塗装して電着塗膜を形成した後、前記樹脂膜部分を重ね合わせ、前記導電性短繊維同士を互いに接触させて通電させることにより抵抗溶接する方法が提案されている（例えば特許文献２）。 For such problems, a resin film made of a thermoplastic resin and conductive short fibers is formed on an iron plate, and an electrodeposition coating film is formed by electrodeposition coating on portions other than the resin film, and then the resin film A method of resistance welding by overlapping portions and bringing the conductive short fibers into contact with each other and energizing them has been proposed (for example, Patent Document 2).

特開２００４−１５５３７１号公報JP 2004-155371 A 特開昭６４−６５２９７号公報JP-A-64-65297

上記抵抗溶接を用いる方法では、少量生産において、防錆性に優れた物品を製造することができるが、特殊な樹脂膜を用いるため、コスト上昇が予想される。また、電着塗装を施した後で溶接を行うため、電着塗装に対して、溶接時の熱による影響が懸念される。 In the method using resistance welding, an article excellent in rust prevention can be manufactured in a small amount of production, but since a special resin film is used, an increase in cost is expected. Moreover, since welding is performed after the electrodeposition coating is performed, there is a concern about the influence of heat during welding on the electrodeposition coating.

そこで本発明は上記した問題点に鑑み、安価にして製造容易で、溶接箇所の錆防止効果に優れた溶接を用いた塗装金属部品の製造方法を提供することを目的とする。 Accordingly, an object of the present invention is to provide a method for manufacturing a coated metal part using welding which is inexpensive and easy to manufacture and has an excellent effect of preventing rust at a welded portion.

上記目的を達成するために、請求項１に係る発明は、金属製のベース部材と金属製のアタッチメントとを抵抗溶接する溶接を用いた塗装金属部品の製造方法において前記ベース部材の溶接箇所と対応する前記アタッチメントの溶接箇所で溶接後に塗装ができない部分に導電性塗料を塗布した後、それらの溶接箇所を合わせ、それらベース部材とアタッチメントの未塗装部分に抵抗溶接の電極を当てて通電し、前記導電性塗料を介して両溶接箇所を溶接し、この後、それらベース部材とアタッチメントの内外面の未塗装部分を塗装することを特徴とする。 In order to achieve the above-mentioned object, the invention according to claim 1 corresponds to a welded portion of the base member in a method of manufacturing a painted metal part using welding in which a metal base member and a metal attachment are resistance-welded. After applying the conductive paint to the part that cannot be painted after welding at the welded part of the attachment, align the welded parts, apply the resistance welding electrode to the unpainted part of the base member and the attachment, Both welding locations are welded via a conductive paint, and thereafter, the unpainted portions of the base member and the inner and outer surfaces of the attachment are painted.

また、請求項２に係る発明は、前記ベース部材は、車両の外部に設ける箱であり、前記アタッチメントは、前記箱の蓋を開閉自在に支持するヒンジであり、前記導電性塗料は導電性粉体を含有し、前記未塗装部分の塗装に用いる塗料は非導電性塗料であることを特徴とする。 According to a second aspect of the present invention, the base member is a box provided outside the vehicle, the attachment is a hinge that supports the lid of the box so that it can be opened and closed, and the conductive paint is a conductive powder. The paint used for painting the unpainted part is a non-conductive paint.

また、請求項３に係る発明は、前記ベース部材は、車両の外部に設ける金属製の箱であり、前記アタッチメントは、前記箱の蓋を開閉自在に支持するヒンジであり、前記溶接箇所は、前記箱と前記ヒンジの取付対向面と、前記蓋と前記ヒンジの取付対向面であり、前記各取付対向面に前記導電性塗料を塗布した後、前記抵抗溶接を行い、前記ヒンジと前記箱とをアーク溶接し、これら抵抗溶接とアーク溶接を行った後、前記箱と前記ヒンジの未塗装部分を塗装することを特徴とする。 Moreover, the invention which concerns on Claim 3 WHEREIN: The said base member is a metal box provided in the exterior of a vehicle, The said attachment is a hinge which supports the cover of the said box so that opening and closing is possible, The said welding location is, The mounting opposing surfaces of the box and the hinge, and the mounting opposing surfaces of the lid and the hinge, and after applying the conductive paint to each of the mounting opposing surfaces, performing the resistance welding, the hinge and the box Are arc-welded, and after the resistance welding and arc welding are performed, the unpainted portions of the box and the hinge are painted.

また、請求項４に係る発明は、前記未塗装部分を粉体塗装し、前記導電性塗料は、前記粉体塗装の焼付温度以上の耐熱温度を備えることを特徴とする。 The invention according to claim 4 is characterized in that the unpainted portion is powder-coated, and the conductive paint has a heat-resistant temperature equal to or higher than a baking temperature of the powder coating.

また、請求項５に係る発明は、前記導電性塗料は導電性粉体を含有し、前記未塗装部分の塗装に用いる塗料は非導電性塗料であることを特徴とする。 The invention according to claim 5 is characterized in that the conductive paint contains a conductive powder, and the paint used for painting the unpainted portion is a non-conductive paint.

本発明の請求項１に記載の溶接を用いた塗装金属部品の製造方法によれば、ベース部材とアタッチメントとの溶接箇所に、雨水や潮風などが浸入しても、溶接前に塗布した導電性塗料により耐錆性能が得られるため、錆による耐久性の低下と外観劣化とを防止でき、また、溶接後、未塗装部分の塗装を行うため、溶接作業時に他の塗装部分を損傷する虞がなく、さらに、その未塗装部分の塗装を簡便に行うことができる。 According to the method of manufacturing a coated metal part using welding according to claim 1 of the present invention, even if rainwater or sea breeze enters the welding location between the base member and the attachment, the conductivity applied before welding. Rust resistance performance can be obtained with paint, so it is possible to prevent deterioration of durability and deterioration of appearance due to rust. Also, after painting, unpainted parts are painted, which may damage other painted parts during welding work. In addition, the unpainted portion can be easily painted.

また、請求項２に記載の溶接を用いた塗装金属部品の製造方法によれば、箱とヒンジとの溶接箇所に、雨水や潮風などが浸入しても、溶接前に塗布した導電性粉体を含有する導電性塗料により耐錆性能が得られるため、錆による耐久性の低下と外観劣化とを防止でき、また、溶接後、未塗装部分の塗装を行うため、溶接作業時に他の塗装部分を損傷する虞がなく、さらに、その未塗装部分の塗装を簡便に行うことができる。 In addition, according to the method for manufacturing a painted metal part using welding according to claim 2, the conductive powder applied before welding even if rainwater or sea breeze enters the welding location between the box and the hinge. Rust resistance performance is obtained by the conductive paint containing, so that it is possible to prevent deterioration of durability and deterioration of appearance due to rust, and to paint unpainted parts after welding. In addition, the unpainted portion can be easily painted.

また、請求項３に記載の溶接を用いた塗装金属部品の製造方法によれば、請求項１の効果に加えて、車両の外部に設ける箱において、錆止め効果が得られ、したがって、露出して使用することにより、溶接箇所に雨水等が浸入しても、錆の発生を防止できる。 Further, according to the method for manufacturing a painted metal part using welding according to claim 3, in addition to the effect of claim 1, a rust prevention effect is obtained in a box provided outside the vehicle. By using it, the occurrence of rust can be prevented even if rainwater or the like enters the welded part.

また、請求項４に記載の溶接を用いた塗装金属部品の製造方法によれば、請求項１の効果に加えて、粉体塗装時に加わる熱により、導電性塗料が影響を受けることがない。 According to the method for manufacturing a coated metal part using welding according to claim 4, in addition to the effect of claim 1, the conductive paint is not affected by heat applied during powder coating.

また、請求項５に記載の溶接を用いた塗装金属部品の製造方法によれば、請求項３の効果に加えて、導電性粉体により導電性が得られ、一方、溶接後の塗装は、非導電性塗料を用いることにより、安価となる。 Further, according to the method for producing a coated metal part using welding according to claim 5, in addition to the effect of claim 3, conductivity is obtained by the conductive powder, while the coating after welding is performed, By using a non-conductive paint, the cost is reduced.

本実施例の実施例１に係るヒンジの分解斜視図である。It is a disassembled perspective view of the hinge which concerns on Example 1 of a present Example. 同上、ヒンジの取付状態を示す断面図である。It is sectional drawing which shows the attachment state of a hinge same as the above. 同上、ヒンジの正面図である。It is a front view of a hinge same as the above. 同上、ヒンジの断面図である。It is a sectional view of a hinge same as the above. 同上、ヒンジの抜止め加締め部の斜視図である。FIG. 6 is a perspective view of the hinged crimping portion of the hinge. 同上、ヒンジの要部の断面図である。It is sectional drawing of the principal part of a hinge same as the above. 同上、蓋へのヒンジの取付工程を示す断面図である。It is sectional drawing which shows the attachment process of the hinge to a cover same as the above. 同上、車両への箱の取付状態を示す斜視図である。It is a perspective view which shows the attachment state of the box to a vehicle same as the above. 同上、箱の背面図である。It is a rear view of a box same as the above. 同上、側板部の段部の断面図である。It is sectional drawing of the step part of a side-plate part same as the above. 同上、箱の底面図である。It is a bottom view of a box same as the above. 同上、図１１のＩ−Ｉ線断面図である。It is the II sectional view taken on the line of FIG. 11 same as the above. 同上、開閉ロック装置を取付ける前の箱の正面図である。It is a front view of the box before attaching an opening / closing lock apparatus same as the above. 本実施例の実施例２に係る塗装装置の概略側面図である。It is a schematic side view of the coating apparatus which concerns on Example 2 of a present Example. 同上、図１４のＡ−Ａ線断面図である。It is an AA line sectional view of Drawing 14 same as the above.

以下、図面を参照して、本発明の好適な実施例について説明する。 Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

以下、図面を参照して、本発明の好適な実施例について説明する。図１〜図１３に示すように、金属製からなる有底な箱２は、その上部の開口部３を開閉する蓋４と、この蓋４を前記箱２に開閉自在に支持するヒンジ５とを備える。この例では、箱２がベース部材であり、ヒンジ５がアタッチメントである。また、前記箱２は、底板部６と四つの側板部７とを備え、図８などに示すように、前記箱２は、自動二輪などの車両８の後部の荷台９などに取り付けられる。尚、前記箱２と蓋４を形成する金属板の厚さは、０．８ミリ程度である。 Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 13, the bottomed box 2 made of metal includes a lid 4 that opens and closes an opening 3 at an upper portion thereof, and a hinge 5 that supports the lid 4 so as to be freely opened and closed on the box 2. Is provided. In this example, the box 2 is a base member, and the hinge 5 is an attachment. The box 2 includes a bottom plate portion 6 and four side plate portions 7, and the box 2 is attached to a loading platform 9 at the rear of a vehicle 8 such as a motorcycle as shown in FIG. The metal plate forming the box 2 and the lid 4 has a thickness of about 0.8 mm.

図１、図３〜図５に示すように、前記ヒンジ５は、一対の板状部材10，10Ａを備え、これら板状部材10，10Ａは、間隔を置いて配置した複数の連結筒11，11Ａを有し、それら連結筒11，11Ａは互い違いの位置にあり、一方の板状部材10の連結筒11，11の隙間に、他方の板状部材10Ａの連結筒11Ａが挿入配置されると共に、他方の連結筒11Ａ，11Ａの隙間に、一方の連結筒11が挿入配置される。この例では、金属製の薄板12を折り曲げて重ね合わせ、その折曲げ箇所を筒状に形成し、前記間隔に対応する部分を削除することにより、前記連結筒11，11Ａを形成している。それら板状部材10，10Ａ同士は、連結筒11，11Ａの配置が異なる以外は同一構成である。尚、前記薄板12の折り曲げて重ね合わせる面側には、その折り曲げ前に、後述する導電性塗料を塗装しておいてもよい。 As shown in FIGS. 1 and 3 to 5, the hinge 5 includes a pair of plate-like members 10, 10 A, and the plate-like members 10, 10 A are connected to each other with a plurality of connecting cylinders 11, 11A, the connecting cylinders 11 and 11A are located at alternate positions, and the connecting cylinder 11A of the other plate-like member 10A is inserted and disposed in the gap between the connecting cylinders 11 and 11 of the one plate-like member 10. The one connecting cylinder 11 is inserted into the gap between the other connecting cylinders 11A and 11A. In this example, the metal thin plates 12 are folded and overlapped, the bent portions are formed in a cylindrical shape, and the connecting cylinders 11 and 11A are formed by deleting portions corresponding to the intervals. The plate-like members 10 and 10A have the same configuration except that the arrangement of the connecting cylinders 11 and 11A is different. Note that a conductive paint described later may be applied to the side of the thin plate 12 that is folded and overlapped before the thin plate 12 is folded.

また、前記ヒンジ５は、金属製の連結軸17を備え、芯を合わせた状態で、前記連結筒11，11Ａ，11，11Ａ…内に前記連結軸17を挿入し、連結筒11の両端部を加締めて抜止め加締め部13を形成する（図５）。尚、挿入前に、あらかじめ一端部に抜止め加締め部13を形成しておいて、挿入後、挿入側の他端部に抜止め加締め部13を形成するようにしてもよい。また、前記板状部材10，10Ａには、複数の孔14，14Ａが穿設され、この例では、各３個の孔14，14Ａが横方向に並んで穿設されている。尚、前記薄板12は、例えば０．４ミリ程度の厚さであり、前記板状部材10，10Ａの厚さは、０．８ミリ程度である。また、ヒンジ５の使用状態で、板状部材10の孔14より板状部材10Ａの孔14Ａが僅かに上方に位置する。 In addition, the hinge 5 includes a metal connecting shaft 17, and the connecting shaft 17 is inserted into the connecting cylinders 11, 11A, 11, 11A. To prevent the removal and tightening portion 13 (FIG. 5). It should be noted that the retaining and tightening portion 13 may be formed in one end portion in advance before insertion, and the retaining and tightening portion 13 may be formed in the other end portion on the insertion side after insertion. The plate-like members 10 and 10A are provided with a plurality of holes 14 and 14A. In this example, three holes 14 and 14A are provided side by side in the horizontal direction. The thin plate 12 has a thickness of about 0.4 mm, for example, and the plate-like members 10 and 10A have a thickness of about 0.8 mm. Further, when the hinge 5 is in use, the hole 14A of the plate member 10A is positioned slightly above the hole 14 of the plate member 10.

前記箱２の上縁は内側に折り返されて内折返し縁部２Ｕが全周に形成され、前記開口部３の長辺の一辺の側板部７上部内面に、前記ヒンジ５の板状部材10が取り付けられる。尚、閉蓋状態で、ヒンジ５は、連結筒11，11Ａを下側にして取り付けられる。また、前記ヒンジ５を取り付ける側板部７の上部には、前記孔14に対応して、図６に示すように、略円筒状をなす複数の位置決め用の凸部15が形成され、その先端は閉じている。前記凸部15は、側板部７の板材をプレス加工して外面側に膨出加工して形成され、その直径は前記孔14の直径より僅かに小さく、その高さは１ミリ＋−０．２程度に形成されている。一例としては、凸部15の直径は略５ミリである。 The upper edge of the box 2 is folded inward to form an inner folded edge 2U on the entire circumference, and the plate-like member 10 of the hinge 5 is formed on the inner surface of the side plate 7 on one side of the long side of the opening 3. It is attached. In the closed state, the hinge 5 is attached with the connecting cylinders 11 and 11A facing downward. Further, as shown in FIG. 6, a plurality of positioning projections 15 having a substantially cylindrical shape are formed on the upper portion of the side plate portion 7 to which the hinge 5 is attached. Closed. The convex portion 15 is formed by pressing the plate material of the side plate portion 7 and bulging to the outer surface side, and its diameter is slightly smaller than the diameter of the hole 14, and its height is 1 mm + -0. It is formed in about 2. As an example, the diameter of the convex portion 15 is approximately 5 mm.

前記蓋４は、上板部21と四つの側板部22とを備え、その上板部21には、該上板部21と略相似形の外段部23と、この外段部23内に設けられ該上板部21の略相似形より上板部21の長さ方向の長さが長い内段部24とがプレス加工により形成され、内側が一段高く形成されている。すなわち、内段部24の幅に対する長さの比が、外段部23の幅に対する長さの比より大きい。また、前記側板部22の下縁は内側に折り返されて内折返し縁部22Ｕが全周に形成され、前記箱２に対応して、一辺の側板部22下側内面に前記ヒンジ５の板状部材10Ａが取り付けられる。また、前記ヒンジ５を取り付ける側板部22には、前記孔14Ａに対応して、前記側板部７と同様に、略円筒状をなす位置決め用の前記凸部15が形成されている。 The lid 4 includes an upper plate portion 21 and four side plate portions 22. The upper plate portion 21 includes an outer step portion 23 that is substantially similar to the upper plate portion 21, and an inner portion of the outer step portion 23. An inner step portion 24 that is provided and is longer than the substantially similar shape of the upper plate portion 21 in the length direction of the upper plate portion 21 is formed by pressing, and the inner side is formed one step higher. That is, the ratio of the length to the width of the inner step portion 24 is larger than the ratio of the length to the width of the outer step portion 23. Further, the lower edge of the side plate portion 22 is folded inward to form an inner turn-up edge portion 22U on the entire circumference, and the plate-like shape of the hinge 5 is formed on the lower inner surface of the side plate portion 22 on one side corresponding to the box 2. The member 10A is attached. The side plate portion 22 to which the hinge 5 is attached is formed with the convex portion 15 for positioning having a substantially cylindrical shape corresponding to the hole 14A, like the side plate portion 7.

そして、前記ヒンジ５の前記板状部材10，10Ａは、溶接箇所である溶接面16，16Ａが平坦になるように、連結筒11，11Ａは、その板状部材10，10Ａの厚さ方向一側よりに形成され、図２及び図４に示すように、蓋４を閉めた状態で、連結筒11，11Ａの孔の直径に対応した隙間が、両板状部材10，10Ａの間に形成される。そして、前記溶接面16と対向する側板部７の外面が取付対向面たる溶接面７Ｍであり、前記溶接面16Ａと対向する側板部22の内面が取付対向面たる溶接面22Ｍである。 The plate-like members 10 and 10A of the hinge 5 are connected to the connecting cylinders 11 and 11A in the thickness direction of the plate-like members 10 and 10A so that the welding surfaces 16 and 16A that are welded portions are flat. 2 and 4, with the lid 4 closed, a gap corresponding to the diameter of the hole of the connecting cylinder 11, 11A is formed between the two plate-like members 10, 10A. Is done. The outer surface of the side plate portion 7 facing the welding surface 16 is a welding surface 7M as a mounting facing surface, and the inner surface of the side plate portion 22 facing the welding surface 16A is a welding surface 22M as a mounting facing surface.

前記板状部材10と、側板部７と、この側板部７の裏面に配置した裏当て金たる金属プレート18の３者が、スポット溶接により一体的に溶着される。この金属プレート18は、厚さ１．６ミリで、側板部７より厚く、幅は１６ミリ程度であり、前記板状部材10とほぼ同一長さをなし、このように側板部７より厚い金属プレート18を当てることにより、溶接の熱影響などによる箱２の変形を防止し、ヒンジ５の動きを安定化している。尚、上述したように、前記箱２の側板部７の上縁は、内側に折り返した折返し縁部２Ｕが全周に設けられ、図２に示したように、その折返し縁部２Ｕの先端に前記金属プレート18の上縁を突き合わせて、該金属プレート18を配置している。 The plate member 10, the side plate portion 7, and the metal plate 18 serving as a backing metal disposed on the back surface of the side plate portion 7 are integrally welded by spot welding. The metal plate 18 has a thickness of 1.6 mm, is thicker than the side plate portion 7, has a width of about 16 mm, is substantially the same length as the plate-like member 10, and is thus thicker than the side plate portion 7. By applying the plate 18, the deformation of the box 2 due to the thermal effect of welding is prevented, and the movement of the hinge 5 is stabilized. As described above, the upper edge of the side plate portion 7 of the box 2 is provided with a folded edge 2U that is folded inward on the entire circumference, and as shown in FIG. 2, at the tip of the folded edge 2U. The metal plate 18 is arranged so as to abut the upper edge of the metal plate 18.

また、箱２の側板部７には、横長な長方形の段部25がプレスにより形成され、段部25の内側の板材が外側の板材より外側に突出している。また、その段部25は、上下に間隔を置いて、複数段に設けられている。尚、図８及び図１３に示すように、係止操作部37の取付箇所39においては、その取付箇所39を除いてその両側に段部25，25が設けられている。 Further, a laterally long rectangular step 25 is formed on the side plate portion 7 of the box 2 by pressing, and a plate material inside the step portion 25 projects outward from an outer plate material. Further, the step portion 25 is provided in a plurality of steps at intervals in the vertical direction. As shown in FIGS. 8 and 13, the mounting portion 39 of the locking operation portion 37 is provided with step portions 25 and 25 on both sides thereof except for the mounting portion 39.

そして、上記段部23，24，25を設けることにより、側板部７，22の剛性を高めて補強することができる。 And by providing the said step part 23,24,25, the rigidity of the side-plate part 7 and 22 can be improved and reinforced.

前記四つの側板部７，７，７，７は、隣合う角部７Ｋ，７Ｋ，７Ｋ，７Ｋで連続した金属板から形成され、この金属板を前記角部７Ｋ，７Ｋ，７Ｋ，７Ｋで折曲げ加工し、その金属板の端部（図示せず）をいずれかの側板部７のほぼ中央側で重ね合わせ、この重ね合わせ部分をスポット溶接などにより接合してなる。 The four side plate portions 7, 7, 7, and 7 are formed of metal plates that are continuous at adjacent corner portions 7K, 7K, 7K, and 7K, and the metal plates are folded at the corner portions 7K, 7K, 7K, and 7K. Bending is performed, the end portions (not shown) of the metal plate are superposed on almost the center side of one of the side plate portions 7, and this superposed portion is joined by spot welding or the like.

また、前記箱２の底板部６の外側は、図１１及び図１２に示すように、前記側板部７，７，７，７の下縁を内側のほぼ水平に折り曲げた下縁部32を形成し、この下縁部32間を、中底板部33により塞いでなる。尚、前記側板部７と下縁部32との間には湾曲状角部32Ｋが形成されている。この湾曲状角部32Ｋに対応して、図１２に示すように、前記中底板部33の周囲に湾曲縁部33Ｋを形成し、前記下縁部32の上に前記中底板部33の周囲を載置して重ね合わせ、この重ね合わせ部分を複数個所でスポット溶接により接合している。尚、図１１は箱２を下からの見た底面図であり、図中、40はスポット溶接箇所である。 Further, as shown in FIGS. 11 and 12, the outer side of the bottom plate portion 6 of the box 2 forms a lower edge portion 32 in which the lower edges of the side plate portions 7, 7, 7, 7 are bent almost horizontally inside. The space between the lower edge portions 32 is closed by the middle bottom plate portion 33. A curved corner portion 32K is formed between the side plate portion 7 and the lower edge portion 32. Corresponding to the curved corner portion 32K, as shown in FIG. 12, a curved edge portion 33K is formed around the middle bottom plate portion 33, and the circumference of the middle bottom plate portion 33 is formed on the lower edge portion 32. They are placed and overlapped, and the overlapped portions are joined at a plurality of locations by spot welding. FIG. 11 is a bottom view of the box 2 as viewed from below. In the figure, reference numeral 40 denotes a spot welding location.

金属板からなる前記中底板部33は、前記下縁部32と共に前記底板部６を構成し、その中底板部33には、中底板部33の長さ方向に長い長方形の段部34，34が中底板部33の幅方向に並んで複数設けられ、この例では、上側に凸となる段部34，34をプレスにより２つ並んで形成しており、それら段部34，34により中底板部33の剛性を高め補強することができる。 The middle bottom plate portion 33 made of a metal plate constitutes the bottom plate portion 6 together with the lower edge portion 32. The middle bottom plate portion 33 includes rectangular step portions 34, 34 that are long in the length direction of the middle bottom plate portion 33. Are provided side by side in the width direction of the midsole plate portion 33. In this example, two step portions 34, 34 that are convex upward are formed side by side by pressing, and the step plate 34, 34 forms the midsole plate. The rigidity of the portion 33 can be increased and reinforced.

また、前記中底板部33には、長孔状をなす複数の取付孔35，35Ａ，35Ｂが穿設されており、この例では、段部34の中にそれぞれ３つの取付孔35，35Ａ，35Ｂを設け、両側の段部34，34内で取付孔35，35Ａ，35Ｂが対応して並んでおり、その取付孔35，35を底板部６の長さ方向一側縁寄りに設け、その取付孔35Ａ，35Ａを中央側に設け、その取付孔35Ｂ，35Ｂを前記長さ方向の他側で前記取付孔35Ａ，35Ａに近い位置に設けている。そして、両側の取付孔35，35Ｂの長さ方向を底板部６の幅方向に合わせ、中央の取付孔35Ａの長さ方向と底面31の長さ方向に合わせている。そして、前記取付孔35，35Ａ，35Ｂに固定手段たるボルト（図示せず）を挿通し、車両８の取付部たる前記荷台９に、そのボルトとナットを用いて箱２が取り付けられる。尚、前記中底板部33は、その厚さが１．２ミリで、蓋４や箱２の側板部７より厚く構成されており、これにより前記取付孔35，35Ａ，35Ｂなどを用いて荷台９に取り付けるための強度を備えている。 The inner bottom plate portion 33 has a plurality of attachment holes 35, 35A, 35B each having a long hole shape. In this example, three attachment holes 35, 35A, 35B is provided, and mounting holes 35, 35A, 35B are lined up correspondingly in the step portions 34, 34 on both sides, and the mounting holes 35, 35 are provided near one side edge in the length direction of the bottom plate portion 6, The mounting holes 35A and 35A are provided on the center side, and the mounting holes 35B and 35B are provided on the other side in the length direction at positions close to the mounting holes 35A and 35A. The length directions of the mounting holes 35 and 35B on both sides are aligned with the width direction of the bottom plate portion 6, and are aligned with the length direction of the central mounting hole 35A and the length direction of the bottom surface 31. Then, a bolt (not shown) as a fixing means is inserted into the mounting holes 35, 35 A, 35 B, and the box 2 is attached to the loading platform 9 as an attachment portion of the vehicle 8 using the bolts and nuts. The inner bottom plate portion 33 has a thickness of 1.2 mm and is thicker than the lid 4 and the side plate portion 7 of the box 2, so that the loading platform 35, 35 A, 35 B and the like can be used. The strength for attaching to 9 is provided.

また、ヒンジ５と反対側の側板部７の上部外面には、バックル式開閉ロック装置36の係止操作部37が設けられると共に、ヒンジ５と反対側の蓋４の側板部22に前記開閉ロック装置36の係止受部38が設けられる。 Further, a locking operation portion 37 of a buckle type opening / closing lock device 36 is provided on the upper outer surface of the side plate portion 7 on the side opposite to the hinge 5, and the opening / closing lock is provided on the side plate portion 22 of the lid 4 on the side opposite to the hinge 5. A locking receiver 38 of the device 36 is provided.

次に、出来上がった状態の箱２と蓋４に、ヒンジ５を抵抗溶接により接合する方法について、説明する。それら箱２と蓋４とヒンジ５とは、鍍金は施されておらず、また、それらを形成する材料は鍍金が施されておらず、全体が無塗装、あるいは少なくともヒンジ５と溶着する箇所周辺は無塗装とし、この例では、全体を無塗装とした場合について説明する。尚、金属製の箱２とヒンジ５は、未鍍金の素材を用いることにより、調達が容易で材料コストが安価なものとなる。 Next, a method for joining the hinge 5 to the completed box 2 and the lid 4 by resistance welding will be described. The box 2, the lid 4, and the hinge 5 are not plated, and the material forming them is not plated, and the whole is unpainted or at least around the portion where the hinge 5 is welded In this example, the case where the whole is unpainted will be described. The metal box 2 and the hinge 5 can be easily procured and the material cost can be reduced by using an unplated material.

まず、図１に示すように、ヒンジ５の溶接面16，16Ａと、側板部７の外面及び側板部22の内面のそれら溶接面16，16Ａに対応する溶接面７Ｍ，22Ｍに、導電性塗料（図示せず）を刷毛塗りで塗装する。この場合、導電性塗料の塗装の前に、ヒンジ５の脱脂処理を行う。尚、アーク溶接箇所である凸部15の先端と孔14とは、後でアーク溶接を行うために、導電性塗料による塗装は行わない。前記導電性塗料は、非導電性の樹脂と導電性粉末を含有し、その導電性粉末としては、導電性の鉄，アルミ，亜鉛，炭素のいずれか又はそれらを組み合わせたものが例示される。尚、箱２及び蓋４の材料となる板材の対応する部分に、導電性塗料を塗装してから、箱２及び蓋４を組み立ててもよい。 First, as shown in FIG. 1, the conductive paint is applied to the welding surfaces 16 and 16A of the hinge 5 and the welding surfaces 7M and 22M corresponding to the welding surfaces 16 and 16A of the outer surface of the side plate portion 7 and the inner surface of the side plate portion 22. Paint (not shown) with a brush. In this case, the hinge 5 is degreased before the conductive paint is applied. Note that the tip of the projection 15 and the hole 14 which are arc welding locations are not coated with a conductive paint in order to perform arc welding later. The conductive paint contains a non-conductive resin and a conductive powder, and examples of the conductive powder include conductive iron, aluminum, zinc, carbon, or a combination thereof. Note that the box 2 and the lid 4 may be assembled after the conductive paint is applied to the corresponding portions of the plate material used as the material of the box 2 and the lid 4.

このようにして、溶接面16，16Ａと、この溶接面７Ｍ，22Ｍと突き合わされて溶接後に塗装ができない部分とに、前記導電性塗料を塗布し、この導電性塗料が乾燥した後、箱２においては、凸部15に孔14を合わせて側板部７の外面に板状部材10の溶接面16を位置決めし、溶接面16と側板部７の外面の溶接面７Ｍを面接触した状態とし、さらに、溶接箇所たる溶接面16に対応して、金属プレート18を側板部７の内面に配置し、それら板状部材10，側板部７及び金属プレート18を、スポット溶接機の電極（図示せず）で挟んで押し付けた状態で、それら電極間に電流を流し、それら板状部材10，側板部７及び金属プレート18をスポット溶接し、スポット溶接箇所51は、図９に示すように、板状部材10の長さ方向に間隔を置いて複数箇所で行われる。尚、板状部材10におけるスポット溶接箇所51の高さ位置は、前記孔14の高さ位置とほぼ同一である。前記電極は、未塗装部分に当てられ、そのスポット溶接機として、交流タイプのものを用いる。また、上述したように凸部15の少なくとも一部及び孔14は未塗装であり、前記凸部15を挿入した孔14に、アーク溶接によるプラグ溶接を施す。尚、図６中、41はアーク溶接のビードである。また、板状部材10，10Ａの縁部と、側板部７，22とをアーク溶接してもよい。 In this way, the conductive paint is applied to the welded surfaces 16, 16A and the portions that are abutted with the welded surfaces 7M, 22M and cannot be painted after welding, and after the conductive paint is dried, the box 2 , The hole 14 is aligned with the convex portion 15, the welding surface 16 of the plate-like member 10 is positioned on the outer surface of the side plate portion 7, and the welding surface 16 and the welding surface 7M of the outer surface of the side plate portion 7 are in surface contact with each other. Further, a metal plate 18 is arranged on the inner surface of the side plate portion 7 corresponding to the welding surface 16 as a welding location, and the plate-like member 10, the side plate portion 7 and the metal plate 18 are connected to an electrode (not shown) of a spot welder. 9), the plate member 10, the side plate portion 7 and the metal plate 18 are spot-welded, and the spot welded portion 51 has a plate shape as shown in FIG. It is performed at a plurality of locations at intervals in the length direction of the member 10. Note that the height position of the spot welded portion 51 in the plate-like member 10 is substantially the same as the height position of the hole 14. The electrode is applied to an unpainted portion, and an AC type is used as the spot welder. Further, as described above, at least a part of the convex portion 15 and the hole 14 are unpainted, and the plug 14 by arc welding is applied to the hole 14 into which the convex portion 15 is inserted. In FIG. 6, reference numeral 41 denotes an arc welding bead. Further, the edge portions of the plate-like members 10 and 10A and the side plate portions 7 and 22 may be arc-welded.

また、蓋４においては、前記導電性塗料が乾燥した後、凸部15に孔14Ａを合わせて側板部22の内面に板状部材10Ａの溶接面16Ａを位置決めする。この場合、側板部22の下端には、内折返し縁部22Ｕが形成され、一方、板状部材10Ａは平坦に形成されているため、板状部材10Ａは、その上部が側板部22の内面に接し、その下部側が内折返し縁部22Ｕの内面に接するため、図７に示すように、側板部22に対して、板状部材10Ａが斜めに配置されるが、板状部材10Ａは薄く、上下方向に十分な幅を有しているから、凸部15の横方向に複数列に並んだ位置でスポット溶接を行うことにより、電極の押圧力で板状部材10Ａが曲がり、側板部22と内折返し縁部22Ｕの内面に添った状態で溶着される。また、スポット溶接により、板状部材10Ａの重ね合わせた薄板12，12同士も溶着される。溶接面16Ａと側板部22の内面の溶接面22Ｍを面接触した状態とし、それら板状部材10Ａと側板部22を、スポット溶接機の電極で挟んで押し付けた状態で、それら電極間に電流を流し、それら板状部材10Ａと側板部22とをスポット溶接し、スポット溶接箇所51は、図９に示すように、板状部材10Ａの長さ方向に間隔を置いて複数箇所で行われる。尚、板状部材10Ａにおけるスポット溶接箇所51の高さ位置は、前記孔14Ａの高さ位置とほぼ同一である。前記電極は、未塗装部分に当てられ、そのスポット溶接機として、箱２と同様に、交流タイプのものを用いる。また、上述したように凸部15の少なくとも一部及び孔14は未塗装であり、前記凸部15を挿入した孔14に、アーク溶接によるプラグ溶接を施す。尚、図６中、41は凸部15と孔14，14Ａをアーク溶接したビードである。また、前記ビード41は孔14，14Ａの全周に設ける必要はなく、部分的に半周程度設けられていればよい。 Further, in the lid 4, after the conductive paint is dried, the hole 14 A is aligned with the convex portion 15 and the welding surface 16 A of the plate-like member 10 A is positioned on the inner surface of the side plate portion 22. In this case, an inner folded edge portion 22U is formed at the lower end of the side plate portion 22, while the plate-like member 10A is formed flat, so that the upper portion of the plate-like member 10A is on the inner surface of the side plate portion 22. Since the lower side is in contact with the inner surface of the inner folded edge portion 22U, as shown in FIG. 7, the plate-like member 10A is disposed obliquely with respect to the side plate portion 22, but the plate-like member 10A is thin, Since it has a sufficient width in the direction, the plate member 10A is bent by the pressing force of the electrode by spot welding at the positions aligned in a plurality of rows in the lateral direction of the convex portion 15, and the side plate portion 22 and the inner portion It welds in the state along the inner surface of the folded edge 22U. Further, the thin plates 12 and 12 on which the plate-like members 10A are overlapped are also welded together by spot welding. The welding surface 16A and the welding surface 22M of the inner surface of the side plate portion 22 are brought into surface contact, and the plate member 10A and the side plate portion 22 are sandwiched and pressed between the electrodes of a spot welder, and a current is passed between the electrodes. Then, the plate-like member 10A and the side plate portion 22 are spot-welded. As shown in FIG. 9, the spot welded portions 51 are performed at a plurality of places at intervals in the length direction of the plate-like member 10A. Note that the height position of the spot welded portion 51 in the plate-like member 10A is substantially the same as the height position of the hole 14A. The electrode is applied to an unpainted portion, and an AC type one is used as the spot welder, like the box 2. Further, as described above, at least a part of the convex portion 15 and the hole 14 are unpainted, and the plug 14 by arc welding is applied to the hole 14 into which the convex portion 15 is inserted. In FIG. 6, reference numeral 41 denotes a bead obtained by arc welding the convex portion 15 and the holes 14 and 14A. Further, the bead 41 does not have to be provided on the entire circumference of the holes 14 and 14A, but may be provided on a half circumference.

このようにして、溶接による板状部材10，10Ａの溶接が終了した後、連結筒11，11Ａを位置合わせし、それら連結筒11，11Ａ・・・に連結軸17を挿入し、抜止め加締め部13を形成してヒンジ５を組み立てる。これにより、箱２に蓋４がヒンジ５により開閉自在に設けられる。 In this way, after the welding of the plate-like members 10 and 10A by welding is completed, the connecting cylinders 11 and 11A are aligned, and the connecting shaft 17 is inserted into the connecting cylinders 11 and 11A. The fastening part 13 is formed and the hinge 5 is assembled. Thereby, the lid 4 is provided on the box 2 so as to be freely opened and closed by the hinge 5.

この後、一体となった箱２と蓋４とを脱脂洗浄後、未塗装部分に塗装を行い、この塗装には非導電性塗料が用いられる。この場合、吹付け塗装を用いた焼付塗装を行うことができる。そして、ヒンジ５の板状部材10，10Ａにおいては、薄板12を重ね合わせて密着させており、その板状部材10，10Ａの周囲に吹付等の塗装を施すことで、耐水性を確保することができる。また、上述したように、薄板12の重ね合わせ面に導電性塗料を刷毛塗りなどにより塗布しておいてもよく、さらに、板状部材10，10Ａにおいて、重ね合わせた薄板12同士を、予めスポット溶接により接合したり、周囲をアーク溶接して接合したりしてもよい。 Thereafter, the integral box 2 and the lid 4 are degreased and washed, and then an unpainted portion is painted, and a non-conductive paint is used for this coating. In this case, baking painting using spray painting can be performed. And in the plate-like members 10 and 10A of the hinge 5, the thin plates 12 are overlapped and brought into close contact with each other, and the water resistance is ensured by applying coating such as spraying around the plate-like members 10 and 10A. Can do. Further, as described above, a conductive paint may be applied to the overlapping surface of the thin plates 12 by brushing or the like. Further, in the plate-like members 10 and 10A, the overlapping thin plates 12 are spotted in advance. They may be joined by welding, or may be joined by arc welding around them.

未塗装部分の塗装が乾燥した後、即ち全て塗装が終了した後、ヒンジ５と反対の側の側板部７の上部に、係止操作部37を取り付け、ヒンジ５と反対側の蓋４の側板部22に係止受部38を取り付ける。 After the coating of the unpainted portion is dried, that is, after all the coating is completed, a locking operation portion 37 is attached to the upper portion of the side plate portion 7 on the side opposite to the hinge 5, and the side plate of the lid 4 on the side opposite to the hinge 5 The latch receiving part 38 is attached to the part 22.

尚、鞍乗り型車両の後部キャリアに取り付ける場合、そのための加工及び取付金具などの取付は、非導電性塗装の吹き付けなどによる塗装の前に行う。 In addition, when attaching to the rear carrier of a saddle-ride type vehicle, processing for that purpose and attachment of mounting brackets are performed before painting by spraying non-conductive paint or the like.

そして、上述したように、ヒンジ５の板状部材10，10Ａは、薄板12を重ね合わせて、箱２の側板部７と略同じ厚さを有し、折り返し部分により構成した連結筒11，11Ａに連結軸17を挿入することにより、板状部材10，10Ａ同士が揺動可能となる。また、図２などに示したように、蓋４を閉めた状態で、ヒンジ５は、連結筒11，11Ａを蓋４の側板部７の下縁より下方に露出して配置されている。また、図２に示したように、板状部材10，10Ａの上下幅に対して、内折返し縁部22Ｕの上下幅は十分に狭く、また、蓋４を閉めた状態で、平行となる板状部材10，10Ａ同士は、連結筒11，11Ａの直径に対応した隙間を残して向かい合う。 As described above, the plate-like members 10 and 10A of the hinge 5 have the same thickness as the side plate portion 7 of the box 2 with the thin plates 12 overlapped, and the connecting cylinders 11 and 11A constituted by the folded portions. By inserting the connecting shaft 17 into the plate member 10, the plate members 10 and 10A can swing. Further, as shown in FIG. 2 and the like, the hinge 5 is arranged with the connecting cylinders 11 and 11A exposed below the lower edge of the side plate portion 7 of the lid 4 in a state where the lid 4 is closed. In addition, as shown in FIG. 2, the vertical width of the inner folded edge portion 22U is sufficiently narrow with respect to the vertical width of the plate-like members 10 and 10A, and is a parallel plate with the lid 4 closed. The shaped members 10 and 10A face each other leaving a gap corresponding to the diameter of the connecting cylinders 11 and 11A.

このように本実施例では、金属製のベース部材たる箱２と金属製のアタッチメントたるヒンジ５とを抵抗溶接する溶接を用いた塗装金属部品の製造方法において、箱２の溶接箇所と対応するヒンジ５の溶接箇所で溶接後に塗装ができない部分に導電性塗料を塗布した後、それらの溶接箇所を合わせ、それら箱２とヒンジ５の未塗装部分に抵抗溶接の電極を当てて通電し、導電性塗料を介して両溶接箇所を溶接し、この後、それら箱２とヒンジ５の内外面の未塗装部分を塗装するから、箱２とヒンジ５との溶接箇所に、雨水や潮風などが浸入しても、溶接前に塗布した導電性塗料により耐錆性能が得られるため、錆による耐久性の低下と外観劣化とを防止でき、また、溶接後、未塗装部分の塗装を行うため、溶接作業時に他の塗装部分を損傷する虞がなく、さらに、その未塗装部分の塗装を簡便に行うことができる。
As described above, in this embodiment, in the method for manufacturing a painted metal part using welding in which the box 2 as the metal base member and the hinge 5 as the metal attachment are resistance-welded, the hinge corresponding to the welded portion of the box 2 is used. After applying the conductive paint to the part that cannot be painted after welding at the welded part 5, align the welded parts and apply the resistance welding electrode to the unpainted part of the box 2 and the hinge 5 to conduct electricity. Both welds are welded via paint, and then the unpainted parts of the inner and outer surfaces of the box 2 and the hinge 5 are painted. Therefore, rainwater, sea breeze, etc. enter the welded part of the box 2 and the hinge 5. However, since the anti-rust performance is obtained by the conductive paint applied before welding, it is possible to prevent deterioration of durability and deterioration of appearance due to rust. Sometimes damage other painted parts Fear without further, it is possible to paint the uncoated portion easily.

また、このように本実施例では、前記ベース部材は、車両８の外部に設ける箱２であり、前記アタッチメントは、箱２の蓋４を開閉自在に支持するヒンジ５であり、導電性塗料は導電性粉体を含有し、前記未塗装部分の塗装に用いる塗料は非導電性塗料であるから、箱２とヒンジ５との溶接箇所に、雨水や潮風などが浸入しても、溶接前に塗布した導電性粉体を含有する導電性塗料により耐錆性能が得られるため、錆による耐久性の低下と外観劣化とを防止でき、また、溶接後、未塗装部分の塗装を行うため、溶接作業時に他の塗装部分を損傷する虞がなく、さらに、その未塗装部分の塗装を簡便に行うことができる。 As described above, in this embodiment, the base member is the box 2 provided outside the vehicle 8, the attachment is the hinge 5 that supports the lid 4 of the box 2 so that it can be opened and closed, and the conductive paint is Since the paint containing conductive powder and used for painting the unpainted portion is a non-conductive paint, even if rainwater or sea breeze enters the welded area between the box 2 and the hinge 5 before welding, Rust resistance performance can be obtained with the conductive paint containing the applied conductive powder, so it is possible to prevent deterioration of durability and deterioration of appearance due to rust. There is no risk of damaging other painted parts during work, and the unpainted parts can be easily painted.

また、このように本実施例では、前記ベース部材は、車両８の外部に設ける金属製の箱２であり、前記アタッチメントは、箱２の蓋４を開閉自在に支持するヒンジ５であり、前記溶接箇所は、箱２とヒンジ５の取付対向面たる溶接面16，７Ｍと、蓋４とヒンジ５の取付対向面である溶接面16Ａ，22Ｍであり、箱２とヒンジ５の溶接面16，７Ｍと、蓋４とヒンジ５の溶接面16Ａ，22Ｍとに前記導電性塗料を塗布した後、前記抵抗溶接を行い、ヒンジ５と箱２とをアーク溶接し、これら抵抗溶接とアーク溶接を行った後、箱２とヒンジ５の未塗装部分を塗装するから、車両８の外部に設ける箱２において、錆止め効果が得られ、したがって、露出して使用することにより、溶接箇所に雨水等が侵入しても、錆の発生を防止できる。 In this way, in this embodiment, the base member is a metal box 2 provided outside the vehicle 8, and the attachment is a hinge 5 that supports the lid 4 of the box 2 so that it can be opened and closed. The welding locations are the welding surfaces 16 and 7M which are the mounting opposing surfaces of the box 2 and the hinge 5, and the welding surfaces 16A and 22M which are the mounting opposing surfaces of the lid 4 and the hinge 5, and the welding surfaces 16 and 22M of the box 2 and the hinge 5. After applying the conductive paint to 7M, the welding surfaces 16A and 22M of the lid 4 and the hinge 5, the resistance welding is performed, the hinge 5 and the box 2 are arc welded, and the resistance welding and arc welding are performed. After that, since the unpainted portion of the box 2 and the hinge 5 is painted, the rust prevention effect is obtained in the box 2 provided outside the vehicle 8, so that rainwater or the like invades the welded part when exposed. Even so, the generation of rust can be prevented.

また、このように本実施例では、前記導電性塗料は導電性粉体を含有し、前記未塗装部分の塗装に用いる塗料は非導電性塗料であるから、導電性粉体により導電性が得られ、一方、溶接後の塗装に非導電性塗料を用いることにより、安価となる。 In this way, in this embodiment, since the conductive paint contains conductive powder and the paint used for painting the unpainted portion is a non-conductive paint, conductivity is obtained by the conductive powder. On the other hand, by using a non-conductive paint for the coating after welding, the cost is reduced.

図１４〜図１５は、本発明の実施例２を示し、上記実施例１と同一部分に同一符号を付し、その詳細な説明を省略して詳述する。この例では、未塗装部分を粉体塗装し、前記導電性塗料は、前記静電粉体塗装の焼付温度以上の耐熱性を備える耐熱塗料が用いられる。尚、粉体塗装に用いる塗料は非導電性塗料である。 14 to 15 show a second embodiment of the present invention, in which the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. In this example, the unpainted portion is powder-coated, and the conductive paint is a heat-resistant paint having heat resistance equal to or higher than the baking temperature of the electrostatic powder coating. The paint used for powder coating is a non-conductive paint.

前記粉体塗装の方法として、静電粉体塗装法と流動含浸法が例示され、静電粉体塗装法には熱硬化性粉体塗料が用いられ、流動含浸法には熱可塑性粉体塗料が用いられ、以下、静電粉体塗装である静電スプレー法に用いる塗装装置について説明する。尚、板状部材10を溶接したヒンジ組立て前の箱２と板状部材10Ａを溶接したヒンジ組立て前の蓋４を脱脂洗浄後、それぞれの未塗装部分に静電紛体塗装を行う。 Examples of the powder coating method include an electrostatic powder coating method and a fluid impregnation method. The electrostatic powder coating method uses a thermosetting powder coating, and the fluid impregnation method uses a thermoplastic powder coating. Hereinafter, the coating apparatus used for the electrostatic spray method which is electrostatic powder coating will be described. The box 2 before the hinge assembly to which the plate-like member 10 is welded and the lid 4 before the hinge assembly to which the plate-like member 10A is welded are degreased and washed, and then each unpainted portion is coated with electrostatic powder.

コンベア61によって移送される複数の吊金具62に、前記箱２及び前記蓋４が交互に吊掛けされ、コンベア61により、箱２及び蓋４が吹付けブース63と焼付硬化炉64の順に搬送される。尚、吹付けブース63におけるコンベア長に比べて、焼付硬化炉64におけるコンベア長が長く設定されている。 The box 2 and the lid 4 are alternately hung on a plurality of hanging metal fittings 62 transferred by a conveyor 61, and the box 2 and the lid 4 are conveyed by the conveyor 61 in the order of a spray booth 63 and a bake hardening furnace 64. The Note that the conveyor length in the bake hardening furnace 64 is set longer than the conveyor length in the spray booth 63.

吊込み工程において、吊金具62に箱２及び蓋４を別々に吊掛け、コンベア61により吹付けブース63に移送し、吹付けブース63において、コンベア61を介して接地されている箱２及び蓋４に、例えば40ＫＶに印加された粉体塗装ガンから粉体塗料を噴射して箱２及び蓋４の未塗装部分に付着させ、次の焼付硬化炉64において焼付硬化温度220度〜230度で粉体塗装を加熱溶融して硬化させ、箱２及び蓋４の塗装が完了する。尚、静電スプレー法では１回の塗装で30〜150μｍ程度の塗膜厚が自由に得られる。 In the hanging process, the box 2 and the lid 4 are separately hung on the hanging metal fitting 62, transferred to the spray booth 63 by the conveyor 61, and the box 2 and the lid grounded via the conveyor 61 in the spray booth 63. 4, for example, a powder paint is sprayed from a powder coating gun applied to 40 KV to adhere to the unpainted portion of the box 2 and the lid 4, and in the next bake hardening furnace 64 at a bake hardening temperature of 220 to 230 degrees. The powder coating is heated and melted to be cured, and the coating of the box 2 and the lid 4 is completed. In the electrostatic spray method, a coating thickness of about 30 to 150 μm can be freely obtained by one coating.

このように、静電スプレー法により、塗装機たる粉体塗装ガンとの間に高電位差を付与した箱２及び蓋４に、帯電した粉体塗料を吹き付けて付着させた後、箱２及び蓋４を焼付硬化温度で加熱して粉体塗料を溶融固化させ、常温まで冷却することにより塗膜が得られ、前記粉体塗料には熱硬化性塗料を使用するので、焼結硬化炉64で加熱することにより硬化した塗膜が得られる。また、吊金具62により接地したまま移送し、帯電した粉体塗料を付着させ、加熱して硬化させることができる。 As described above, after the electrostatic spray method is applied to the box 2 and the lid 4 to which a high potential difference is given to the powder coating gun as a coating machine, the charged powder paint is sprayed and attached to the box 2 and the lid 4. 4 is heated at the bake curing temperature to melt and solidify the powder coating, and cooled to room temperature. A coating film is obtained, and a thermosetting coating is used for the powder coating. A cured coating film is obtained by heating. Further, it can be transferred while being grounded by the hanging metal fitting 62, and a charged powder paint can be adhered and heated to be cured.

また、静電スプレー法で使用される熱硬化性塗料は、熱を加えることにより化学変化（架橋）を起し、特性が変化する塗料であり、架橋反応により各種の性能を付加させることが可能なため、用途に応じて塗料を選択することができ、また、使用されるベース樹脂は、外装用としてポリエステル樹脂やアクリル樹脂等、内装用としてエポキシ樹脂やハイブリッド（エポキシ／ポリエステル）樹脂等が例示される。 Thermosetting paint used in electrostatic spraying is a paint that undergoes a chemical change (crosslinking) when heated to change its properties, and can add various performances through a crosslinking reaction. Therefore, the paint can be selected according to the application, and examples of the base resin used include polyester resin and acrylic resin for exterior use, and epoxy resin and hybrid (epoxy / polyester) resin for interior use. Is done.

尚、前記箱２及び蓋４に粉体塗料を吹き付ける前に、箱２及び蓋４の温度が低い場合には箱２及び蓋４を前加熱して30〜45度とすれば、一層均一な塗膜を得ることができ、このように前加熱することにより、300〜2000μｍ程度の塗膜厚で塗装を行うことができる。 If the temperature of the box 2 and the lid 4 is low before the powder paint is sprayed on the box 2 and the lid 4, it is more uniform if the box 2 and the lid 4 are preheated to 30 to 45 degrees. A coating film can be obtained, and coating can be performed with a coating thickness of about 300 to 2000 μm by preheating in this way.

また、静電粉体塗装の前に行う溶接箇所の塗装には、耐熱温度が前記焼付硬化温度以上の導電性塗料を用いる。この導電性塗料の耐熱温度は、１２００度程度である。 In addition, a conductive paint having a heat-resistant temperature equal to or higher than the bake-hardening temperature is used for coating the welded portion performed before electrostatic powder coating. The heat resistant temperature of this conductive paint is about 1200 degrees.

そして、板状部材10を溶接した箱２と板状部材10Ａを溶接した蓋４の粉体塗装が完了した後、連結筒11，11Ａを位置合わせし、それら連結筒11，11Ａ・・・に連結軸17を挿入し、抜止め加締め部13を形成してヒンジ５を組み立てる。これにより、箱２に蓋４がヒンジ５により開閉自在に設けられる。 Then, after the powder coating of the box 2 where the plate-like member 10 is welded and the lid 4 where the plate-like member 10A is welded is completed, the connecting cylinders 11, 11A are aligned, and the connecting cylinders 11, 11A. The connecting shaft 17 is inserted, the retaining caulking portion 13 is formed, and the hinge 5 is assembled. Thereby, the lid 4 is provided on the box 2 so as to be freely opened and closed by the hinge 5.

このように本実施例では、前記未塗装部分を粉体塗装し、前記導電性塗料は、前記粉体塗装の焼付温度以上の耐熱温度を備えるから、粉体塗装時に加わる熱により、導電性塗料が影響を受けることがなく、塗装の信頼性が高い製品が得られる。 As described above, in this embodiment, the unpainted portion is powder-coated, and the conductive paint has a heat resistance temperature equal to or higher than the baking temperature of the powder paint. Is not affected, and a product with high coating reliability can be obtained.

また、粉体塗装を用いることにより、高性能の塗膜が得られ、塗装作業のスピードアップと均一な塗膜を得ることができる。 Further, by using powder coating, a high-performance coating film can be obtained, and the coating operation speed can be increased and a uniform coating film can be obtained.

本発明は、本実施例に限定されるものではなく、本発明の要旨の範囲内で種々の変形実施が可能である。例えば、ヒンジは、連結軸に金属以外のものを用いても、金属製のヒンジであることに代わりはなく、また、箱，蓋の一部に金属以外も用いても、金属製の箱である。さらに、実施例では、板状部材10の孔14より板状部材10Ａの孔14Ａが僅かに上方に位置するように構成したが、板状部材10の孔14と板状部材10Ａの孔14Ａとを同じ位置に設け、これに対応して側板部７の凸部15と側板部22の凸部15の位置を設定するようにしてもよい。また、粉体塗装として、熱可塑性塗料を使用するフレームスプレー法や、熱硬化性塗料を使用する電界クラウド法などの塗装方法を用いてもよい。 The present invention is not limited to this embodiment, and various modifications can be made within the scope of the gist of the present invention. For example, even if a hinge other than a metal is used for the connecting shaft, it is not a substitute for a metal hinge. is there. Furthermore, in the embodiment, the hole 14A of the plate member 10A is positioned slightly above the hole 14 of the plate member 10, but the hole 14 of the plate member 10 and the hole 14A of the plate member 10A May be provided at the same position, and the positions of the convex portion 15 of the side plate portion 7 and the convex portion 15 of the side plate portion 22 may be set correspondingly. Further, as the powder coating, a coating method such as a frame spray method using a thermoplastic paint or an electric field cloud method using a thermosetting paint may be used.

２箱（ベース部材）
２Ｕ折返し縁部
３開閉部
４蓋（ベース部材）
５ヒンジ（アタッチメント）
６底板部
７側板部
７Ｍ溶接面（取付対向面）
８車両
９荷台
10 板状部材
10Ａ板状部材
16 溶接面（取付対向面）
16Ａ溶接面（取付対向面）
22Ｍ溶接面（取付対向面） 2 Box (base member)
2U Folding edge 3 Opening / closing part 4 Lid (base member)
5 Hinge (attachment)
6 Bottom plate 7 Side plate 7M Welding surface (mounting facing surface)
8 Vehicle 9 Loading platform
10 Plate member
10A plate member
16 Welding surface (mounting facing surface)
16A Welding surface (mounting facing surface)
22M Welding surface (mounting facing surface)

Claims

In the method of manufacturing a painted metal part using welding for resistance welding a metal base member and a metal attachment,
After applying conductive paint to the welded part of the attachment corresponding to the welded part of the base member to the part that cannot be painted after welding, match the welded parts and apply resistance welding to the unpainted part of the base member and attachment. Apply electricity to the electrodes, weld both welds through the conductive paint,
After that, a method of manufacturing a painted metal part using welding, characterized in that unpainted portions of the base member and the inner and outer surfaces of the attachment are painted.

The base member is a box provided outside the vehicle,
The attachment is a hinge that supports the lid of the box so as to be freely opened and closed,
The conductive paint contains conductive powder,
2. The method of manufacturing a coated metal part using welding according to claim 1, wherein the paint used for painting the unpainted portion is a non-conductive paint.

The base member is a metal box provided outside the vehicle,
The attachment is a hinge that supports the lid of the box so as to be freely opened and closed,
The welding location is the mounting opposing surface of the box and the hinge, the mounting opposing surface of the lid and the hinge,
After applying the conductive paint to each mounting facing surface,
Performing the resistance welding,
Arc welding the hinge and the box;
After performing these resistance welding and arc welding,
2. The method for manufacturing a painted metal part using welding according to claim 1, wherein unpainted portions of the box and the hinge are painted.

Powder coating the unpainted part,
The method for producing a coated metal part using welding according to claim 1, wherein the conductive paint has a heat resistant temperature equal to or higher than a baking temperature of the powder coating.

The conductive paint contains conductive powder,
5. The method for producing a coated metal part using welding according to claim 3, wherein the paint used for painting the unpainted portion is a non-conductive paint.