JP5611287B2 - Painting method - Google Patents
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- JP5611287B2 JP5611287B2 JP2012172454A JP2012172454A JP5611287B2 JP 5611287 B2 JP5611287 B2 JP 5611287B2 JP 2012172454 A JP2012172454 A JP 2012172454A JP 2012172454 A JP2012172454 A JP 2012172454A JP 5611287 B2 JP5611287 B2 JP 5611287B2
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Description
本発明は、塗装方法および塗装装置に関し、特に、溝や突起などの凹凸を含む塗装面を斑なく一定の膜厚で仕上げ、かつ、塗装面の周縁の塗り際を美しく仕上げる塗装方法と装置に関するものである。 The present invention relates to a coating method and a coating apparatus, and more particularly to a coating method and apparatus for finishing a painted surface including irregularities such as grooves and protrusions with a uniform film thickness and beautifully painting the periphery of the painted surface. Is.
従来から、溝や突起がある被塗装材の一部を美しく塗装するために、凹凸部分を斑なく塗装しつつ、塗装の周縁（塗り際）が明確となる塗装方法が求められる場合があった。
例えば、鋳鉄管の受口内面を塗装する場合、溝や突条を含む受口内面を均一な厚みの塗膜で被覆し、さらに、受口内面の端（塗装境界）における塗り際を美しく仕上げることが求められる。
Conventionally, in order to paint a part of the material to be coated with grooves and protrusions beautifully, there has been a demand for a coating method that clearly paints the periphery of the coating (coating) while painting the uneven part without unevenness. .
For example, when painting the inner surface of a receiving end of a cast iron pipe, coat the inner surface of the receiving port, including grooves and protrusions, with a uniform thickness coating, and then finish the coating at the end (painting boundary) of the inner surface of the receiving port beautifully. Is required.
鋳鉄管は、主に水道管などに用いられ、図７に示すように、内外径が均一な筒部３１と、その一端に設けられ外に膨らむ受口３２を備えており、管の内外面には防食のための塗装が施される。
受口３２の内面には、配管後に抜け止め機能や止水機能を持たせるために金属リングやゴムパッキンを嵌める溝や突条が形成されている。また、受口３２の内面と筒部３１の内面との段差をつなぐ奥壁となっている部分３５は、胴付部と呼ばれている。
The cast iron pipe is mainly used for a water pipe or the like, and as shown in FIG. 7, is provided with a cylindrical portion 31 having a uniform inner and outer diameter, and a receiving port 32 provided at one end thereof and swelled outside. Is painted for anticorrosion.
On the inner surface of the receiving port 32, a groove or a ridge for fitting a metal ring or rubber packing is formed in order to provide a retaining function or a water stopping function after piping. Further, a portion 35 that forms a back wall that connects the step between the inner surface of the receiving port 32 and the inner surface of the cylindrical portion 31 is referred to as a body portion.
鋳鉄管の受口内面の塗装は、この図に示すように、鋳鉄管３を管軸周りに回転させた状態で、受口３２の端からスプレーガン１を差し込み、管内面に臨ませた下向きのスプレーガンヘッド１１から円錐形に広がる噴射パターン２で液体塗料を吹き付けて行う。
このように管内面の全周に亘って塗料を吹き付けながら、スプレーガン１を管３の軸方向に移動させて、塗装面を管の軸方向に伸ばし、塗装境界となる胴付部付近まで塗装していく。
As shown in this figure, the inner surface of the receiving port of the cast iron pipe is turned downward with the spray gun 1 inserted from the end of the receiving port 32 and facing the inner surface of the tube while the cast iron tube 3 is rotated around the tube axis. The liquid paint is sprayed from the spray gun head 11 in a spray pattern 2 spreading in a conical shape.
The spray gun 1 is moved in the axial direction of the pipe 3 while spraying the paint over the entire circumference of the inner surface of the pipe in this way, and the painting surface is extended in the axial direction of the pipe, so that the painting is applied to the vicinity of the body portion that becomes the painting boundary. I will do it.
ところで、塗料のスプレー方式として、主に、エアレススプレーとエアスプレーの二つの方式が一般的によく知られている。 By the way, as a paint spraying method, two methods of airless spraying and air spraying are generally well known.
エアレススプレーは、液体塗料に圧力を加えて塗料のみをノズルから吹き付ける方式である。後述するエアスプレーに比べて塗料の吐出量が多く、吹き付ける塗料の粒子が粗くなるため、狭くて入り組んだ部分の塗装に使用することは難しい。
例えば、鋳鉄管の受口内面塗装のような、溝や突条などの凹凸がある部分の塗装に使用した場合、塗料を吹き付ける向きに沿う面、つまり、吹き付け向きと平行な面（例えば図７の側壁３７）では塗着量が少なくなり、塗り漏れ（塗り残し）が発生しやすい。また、塗料の乾きが悪く、溝の側壁３７で塗料が垂れたり、溝の底面３９に塗り溜まりが出来たりする。
Airless spraying is a method in which pressure is applied to a liquid paint and only the paint is sprayed from a nozzle. Compared to the air spray described later, the amount of paint discharged is large, and the particles of paint to be sprayed become coarse. Therefore, it is difficult to use for coating narrow and complicated parts.
For example, when it is used for coating a portion having irregularities such as grooves and ridges, such as the inner surface coating of a cast iron pipe, a surface along the direction in which the paint is sprayed, that is, a surface parallel to the spray direction (for example, FIG. 7). The side wall 37) reduces the amount of coating and tends to cause coating omission (unpainted). Also, the paint does not dry well, and the paint drips on the side wall 37 of the groove, or the paint is accumulated on the bottom surface 39 of the groove.
一方、エアスプレーは、液体塗料を圧縮空気と混ぜて霧のように微粒化して吹き付けるため、溝や突起などの凹凸のある部分でも比較的斑なく均一な厚さの塗膜が得られ、乾きも良く、凹凸のある面の塗装には使いやすい。しかし、塗料を霧のように微粒化するため、塗料の噴射パターンの外郭がぼやけて不明確となり、鋳鉄管の受口内面の塗装で使用した場合、筒部３１の内面と胴付部３５との塗り際を美しく仕上げることができない。 Air spray, on the other hand, mixes liquid paint with compressed air and atomizes it as a mist, and sprays it. It is easy to use for painting uneven surfaces. However, since the paint is atomized like mist, the outline of the spray pattern of the paint is blurred and unclear, and when used for painting the inner surface of the receiving port of the cast iron pipe, The finish of the paint cannot be finished beautifully.
そのため、鋳鉄管の受口内面の塗装方法として、溝や突条などの凹凸のある部分の塗装は、エアスプレーガンを使って行い、胴付部付近の塗装は刷毛塗りを行うものが開示されている（例えば、特許文献１参照）。 For this reason, as a method of painting the inner surface of the receiving end of a cast iron pipe, it is disclosed that an uneven portion such as a groove or a ridge is painted using an air spray gun, and that a paint is applied near the body portion by brushing. (For example, refer to Patent Document 1).
しかしながら、刷毛塗りは、塗装の仕上がりが刷毛の損耗状態にも左右され、同じ刷毛を使用し続けると仕上がり状態に変化が出てくるため、塗装品質の安定性に欠ける。また、スプレー塗装と比べて塗装の斑が出やすいという欠点もある。 However, in brush coating, the finish of the coating depends on the state of wear of the brush, and if the same brush is used continuously, the finish state changes, so that the coating quality is not stable. In addition, there is a drawback that coating spots tend to appear compared to spray coating.
本発明は、鋳鉄管の受口内面のような、溝や突起といった凹凸のある部分でも均一な厚みの塗膜が安定して得られ、その上、筒部内面と胴付部との境目のような塗装の境界線を明確にするために塗り際を美しく仕上げることもできる塗装方法およびその装置を提供することを課題とする。 In the present invention, a coating film having a uniform thickness can be stably obtained even in uneven portions such as grooves and protrusions, such as the inner surface of a receiving port of a cast iron pipe, and in addition, the boundary between the inner surface of the cylindrical portion and the barrel portion It is an object of the present invention to provide a painting method and apparatus capable of beautifully finishing the painting in order to clarify the boundary line of such painting.
上記課題を解決するために、本発明の塗装方法は、被塗装材の凹凸部を斑なく塗装し、その塗装面周縁の塗り際を明確にする塗装方法であって、凹凸部の塗装はスプレーガンヘッドから圧縮空気と液体塗料を混ぜて吹き付け、塗装面周縁の塗装はスプレーガンヘッドから前記液体塗料のみを噴射して行う構成とした。
これにより、溝や突起などの起伏のある部分の塗装は、エアスプレーのように、液体塗料を圧縮空気と混ぜて微粒化し霧状態にしてから吹き付けるため、比較的斑なく均一な厚みの塗膜が得られ、その上、塗装する面の周縁の塗装は、噴射パターンの外郭が明確なエアレススプレーと同様の塗装を行うので塗り際が美しく仕上がり、さらに、刷毛塗りに比べて塗装品質を安定させることができる。
In order to solve the above-mentioned problems, the coating method of the present invention is a coating method that paints uneven portions of a material to be coated without any spots and clarifies the periphery of the coating surface. Compressed air and liquid paint were mixed and sprayed from the gun head, and the coating of the coating surface periphery was performed by spraying only the liquid paint from the spray gun head.
As a result, coating of undulating parts such as grooves and protrusions, like air spray, mixes liquid paint with compressed air, atomizes it, and then sprays it, so it is sprayed with a relatively uniform and uniform thickness. In addition, the coating on the periphery of the surface to be painted is the same as airless spray with a clear outline of the spray pattern, so the finish is beautiful and the coating quality is stabilized compared to brush painting be able to.
また、本発明の塗装方法として、前記被塗装材を管とする構成を採ることができる。
これにより、内外面等に凹凸部がある管であっても、その塗装を美しく仕上げることができる。
Moreover, the structure which uses the said to-be-coated material as a pipe | tube can be taken as a coating method of this invention.
Thereby, even if it is a pipe | tube with an uneven | corrugated | grooved part in an internal / external surface etc., the coating can be finished beautifully.
さらに、本発明の塗装方法として、管内面の凹凸部を斑なく塗装し、その塗装面周縁の塗り際を明確にする塗装方法であって、管の端部からスプレーガンヘッドを挿入し、凹凸部の塗装は前記スプレーガンヘッドから液体塗料を圧縮空気と混ぜて管の内表面に向けて吹き付け、塗装面周縁の塗装はスプレーガンヘッドから前記液体塗料のみを噴射して行う構成を採ることができる。
これにより、凹凸（起伏）部を有する管内面の塗装を安定して美しく仕上げることができる。
Furthermore, as a coating method of the present invention, a coating method is provided for coating the uneven surface of the inner surface of the tube without any spots and clarifying the application of the peripheral edge of the coating surface, inserting a spray gun head from the end of the tube, The coating can be performed by mixing the liquid paint from the spray gun head with the compressed air and spraying the liquid paint toward the inner surface of the pipe, and coating the periphery of the paint surface by spraying only the liquid paint from the spray gun head.
Thereby, the coating of the inner surface of the pipe having the unevenness (undulation) can be stably and beautifully finished.
また、本発明の塗装方法として、鋳鉄管の受口内面の凹凸部を斑なく塗装し、その塗装面周縁の塗り際を明確にする塗装方法であって、鋳鉄管の受口端部からスプレーガンヘッドを挿入し、凹凸部の塗装はスプレーガンヘッドから液体塗料を圧縮空気と混ぜて受口の内表面に向けて吹き付け、塗装面の周縁となる筒部内面と胴付部との境界の塗装はスプレーガンヘッドから前記液体塗料のみを噴射して行う構成を採ることができる。
これにより、鋳鉄管の受口内面の塗装を安定して美しく仕上げることができる。
Further, as a coating method of the present invention, a coating method is provided for coating the irregularities on the inner surface of the receiving end of the cast iron pipe without any spots and clarifying the application of the periphery of the coated surface, and spraying from the receiving end of the cast iron pipe. Insert the gun head, and paint the uneven part by spraying liquid paint from the spray gun head with compressed air and spraying it toward the inner surface of the receiving port. A configuration in which only the liquid paint is sprayed from a spray gun head can be employed.
Thereby, the coating of the inner surface of the receiving port of the cast iron pipe can be finished stably and beautifully.
さらに、本発明の塗装方法として、凹凸部の塗装と塗装面周縁の塗装を同一のスプレーガンヘッドで行い、塗装面周縁の塗装時に圧縮空気の噴気だけを止める構成を採ることができる。
これにより、スプレーガンの数が少なくて済み、その保守管理が容易になり、その上、塗装設備の小型化を図ることができる。
Furthermore, as a coating method of the present invention, it is possible to adopt a configuration in which the uneven portion and the coating surface periphery are applied with the same spray gun head, and only the compressed air is blown when the coating surface periphery is applied.
As a result, the number of spray guns can be reduced, the maintenance and management thereof can be facilitated, and the coating equipment can be downsized.
そして、本発明の塗装装置は、液体塗料と圧縮空気を混ぜて吹き付けるときの噴射パターンを包むようにパターンの外縁に気流を作るスプレーガンヘッドが塗装ランスの先端に取り付けられた塗装装置であって、液体塗料の供給源と圧縮空気の供給源から前記塗装ランスを経て前記スプレーガンヘッドまで、液体塗料の流路と圧縮空気の流路が別々に設けられ、それら各流路の開閉操作をそれぞれ独立して行うことができ、前記塗装ランスがその長手方向に沿って移動する時に、その移動方向とスプレーガンヘッドの位置に基づいて前記開閉操作を行う構成を採ることができる。 The coating apparatus of the present invention is a coating apparatus in which a spray gun head that creates an air flow at the outer edge of a pattern so as to wrap a spray pattern when liquid paint and compressed air are mixed and sprayed is attached to the tip of a coating lance, A liquid paint flow path and a compressed air flow path are provided separately from the paint supply source and the compressed air supply source to the spray gun head through the coating lance, and the opening and closing operations of these flow paths are independently performed. When the coating lance moves along the longitudinal direction, the opening / closing operation can be performed based on the moving direction and the position of the spray gun head.
本発明の塗装方法や塗装装置によれば、鋳鉄管の受口内面のような、溝や突条といった凹凸のある部分でも均一な厚みの塗膜が安定して得られ、その上、塗り際を美しく仕上げて、筒部内面と胴付部との境目のような塗装の境界線を明確にすることができる。 According to the coating method and the coating apparatus of the present invention, a coating film having a uniform thickness can be stably obtained even in uneven portions such as grooves and ridges, such as the inner surface of a receiving port of a cast iron pipe. Can be finished beautifully, and the boundary line of the paint like the boundary between the inner surface of the cylinder part and the body part can be clarified.
以下、本発明の実施形態について、各図面に沿って説明を行う。既述の背景技術と共通するものについては同じ符号を付け、重複する説明は省略する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. The same reference numerals are assigned to those common to the background art described above, and redundant description is omitted.
図１は、本発明の第１の実施形態に係る塗装を鋳鉄管（直管）の受口内面に行っている状態を表した図である。
（ａ）に図示する通り、塗装ランス１２の一端を直角に曲げるように、受口内面に臨む向きにスプレーガンヘッド１１が取り付けられている。塗装ランス１２の他端は、ランス移動装置（図示なし）に接続されており、ランスはその長手方向が管の軸方向とほぼ平行になるように、片持ち支持されている。受口３２の端部から外に飛び出している塗装ランス１２には、圧縮空気を流す配管と液体塗料を流す配管が別々に内包されている。各配管は、圧縮空気と液体塗料の供給源（図示なし）まで伸びている。また、各配管の途中には、電磁弁（図示なし）が設けられ、液体塗料や圧縮空気の流路の開閉を別々に操作することができる。ここで、液体塗料は、例えば、溶剤系の二液性エポキシ樹脂塗料が使用される。
塗装ランス１２は、ランス移動装置によって管３の軸方向に沿って動き、塗装時にはスプレーガン１を受口端部から管に挿入して、先端のスプレーガンヘッド１１が受口内面の胴付部３５付近にくるまで前進し、塗装が完了したらスプレーガンヘッド１１が管３の外に出るまで後退する。
FIG. 1 is a diagram showing a state in which coating according to the first embodiment of the present invention is performed on the inner surface of a receiving port of a cast iron pipe (straight pipe).
As shown in FIG. 5A, the spray gun head 11 is attached in a direction facing the inner surface of the receiving port so that one end of the coating lance 12 is bent at a right angle. The other end of the coating lance 12 is connected to a lance moving device (not shown), and the lance is cantilevered so that its longitudinal direction is substantially parallel to the axial direction of the pipe. The coating lance 12 protruding outward from the end of the receiving port 32 includes a pipe for flowing compressed air and a pipe for flowing liquid paint separately. Each pipe extends to a supply source (not shown) of compressed air and liquid paint. In addition, an electromagnetic valve (not shown) is provided in the middle of each pipe, and the opening and closing of the flow path for liquid paint and compressed air can be operated separately. Here, as the liquid paint, for example, a solvent-based two-component epoxy resin paint is used.
The coating lance 12 is moved along the axial direction of the tube 3 by the lance moving device, and at the time of painting, the spray gun 1 is inserted into the tube from the receiving end, and the spray gun head 11 at the tip is the barrel portion 35 on the inner surface of the receiving port. It moves forward until it comes close, and when painting is completed, it moves backward until the spray gun head 11 comes out of the tube 3.
鋳鉄管３は、筒部３１で円柱形のローラーＲに回転可能に支持されている。電動機（図示せず）を使ってそのローラーＲを回すと、鋳鉄管３はローラーに従動して管軸周りに回転する。
筒部３１の内面には、粉体樹脂塗装が施されている。
受口内面の塗装は、鋳鉄管３を回転させた状態で、塗装ランス１２を軸移動させてスプレーガンヘッド１１を受口内部に挿入し、スプレーガンヘッド１１から管の内面に向けて塗料を吹き付けて行う。
The cast iron pipe 3 is rotatably supported by the cylindrical roller R at the cylindrical portion 31. When the roller R is turned using an electric motor (not shown), the cast iron pipe 3 follows the roller and rotates around the pipe axis.
Powder resin coating is applied to the inner surface of the cylindrical portion 31.
To paint the inner surface of the receiving port, with the cast iron tube 3 rotated, the coating lance 12 is moved axially to insert the spray gun head 11 into the receiving port, and spray the paint from the spray gun head 11 toward the inner surface of the tube. Do.
受口内面の塗装範囲Ｃは、スプレー塗装方法の違いによって、受口３２の端面から奥の胴付部３５の手前にかけて溝や突条などの凹凸部分を含む範囲Ｃ１と、そこからさらに奥の胴付部３５に至る範囲Ｃ２とに分けられる。 The coating area C on the inner surface of the receiving port is divided into a range C1 including an uneven portion such as a groove and a ridge from the end surface of the receiving port 32 to the front of the body part 35 at the back due to a difference in the spray coating method, and further from there. It is divided into a range C2 that reaches the body portion 35.
Ｃ１では、塗装はスプレーガンヘッド１１の先から液体塗料と圧縮空気を噴射するとともに混合させて、塗料を霧のように微粒化した状態で行われる。
液体塗料と空気を混合して霧のように微粒化して吹き付けるため、溝や突条の側壁３７にも塗着し、また、スプレーガンヘッド１１の先から噴き出す圧縮空気が、空気と混ぜて微粒化した塗料全体を包むエアカーテンのように作用するから、塗料が塗装範囲を越えて飛散することをある程度抑制し、塗着効率も良く、その上、気流によって塗料の乾燥が促進され、溝や突条の側壁３７の塗料が垂れたり、溝の底面３９に塗料が溜まったりしない。
ここで、圧縮空気の供給圧力は、０．０５〜０．３ＭＰａの範囲で管理されている。０．０５ＭＰａ未満では、液体塗料の霧化が不十分となり、０．３ＭＰａより高圧になると、塗料の飛散が多くなり、斑ができるなど、仕上がりが悪くなる。
In C1, the coating is performed in a state where liquid paint and compressed air are sprayed and mixed from the tip of the spray gun head 11 and the paint is atomized like mist.
Since liquid paint and air are mixed and atomized like a mist and sprayed, it is also applied to the side walls 37 of grooves and ridges, and the compressed air blown from the tip of the spray gun head 11 is mixed with air and atomized. Since it acts like an air curtain that wraps the entire paint, the paint is prevented from splashing beyond the paint range to some extent, and the coating efficiency is good. The paint on the side wall 37 of the strip does not sag and the paint does not collect on the bottom surface 39 of the groove.
Here, the supply pressure of compressed air is managed in the range of 0.05 to 0.3 MPa. If the pressure is less than 0.05 MPa, the atomization of the liquid paint becomes insufficient, and if the pressure is higher than 0.3 MPa, the paint is scattered more and the finish is deteriorated such as spots.
一方、Ｃ２では、圧縮空気の噴出を止めて、スプレーガンヘッド１１の先から液体塗料のみを微粒化して噴射し、塗装が行われる。
圧縮空気を止めて液体塗料のみを噴射するから、エアレススプレーと同様に、塗料の噴射パターン２の外郭が明確になるため、筒部３１の内面と胴付部３５との境目に噴射パターンの外郭がかかる位置でスプレーガンヘッド１１の軸方向移動（前進）を止めれば、筒部３１の内面と胴付部３５との境目の塗り際（塗装境界）が美しく仕上がる。
On the other hand, in C2, the spray of compressed air is stopped, and only the liquid paint is atomized and sprayed from the tip of the spray gun head 11, and coating is performed.
Since the compressed air is stopped and only the liquid paint is sprayed, the outline of the paint spray pattern 2 becomes clear as in the case of the airless spray. Therefore, the outline of the spray pattern is formed at the boundary between the inner surface of the cylindrical portion 31 and the body portion 35. If the axial movement (advance) of the spray gun head 11 is stopped at such a position, the boundary (coating boundary) between the inner surface of the cylindrical portion 31 and the body portion 35 is beautifully finished.
液体塗料や圧縮空気の噴出開始や停止は、液体塗料や圧縮空気の流路を電磁弁等で開閉することで行われる。この開閉動作は、塗装ランスの移動方向とスプレーガンヘッドの位置をリミットスイッチ等で読み取ることで、上述のＣ１とＣ２との塗装方法の変更や塗り際での塗装完了のタイミングを計って行われる。 The jetting of liquid paint or compressed air is started or stopped by opening and closing the flow path of the liquid paint or compressed air with an electromagnetic valve or the like. This opening / closing operation is performed by reading the moving direction of the coating lance and the position of the spray gun head with a limit switch or the like, thereby measuring the timing of completion of coating at the time of coating or changing the coating method between C1 and C2.
塗装動作を詳しく説明すると、まず、管の外で待機しているスプレーガンヘッド１１を受口内に挿入するために、スプレーガン１が管の軸方向に沿って移動（前進）する。受口３２の端部に噴射パターンがかかる位置まで進んだ時に、液体塗料と圧縮空気の噴射を開始して、液体塗料と空気を混合して霧のように微粒化して受口内面に吹き付けていく。筒部３１の内面と胴付部３５との境目に噴射パターンの外郭がかかる手前までスプレーガン１を前進させ、Ｃ１の往路塗装を行う。
続いて、圧縮空気を止めて液体塗料のみを噴射し、筒部３１の内面と胴付部３５との境目の塗り際（塗装境界）を仕上げる（Ｃ２の塗装）。塗り際を塗装し終わったら、スプレーガン１は管の軸方向に沿って後退する。後退開始と同時に、液体塗料の噴射を止め、塗料の乾燥促進のために圧縮空気だけを約０．５秒間だけ噴出させる。その後、液体塗料も噴射させ、スプレーガン１が軸方向移動（後退）しながら、液体塗料と空気を混合して受口内面に吹き付け、Ｃ１の復路塗装を行う。
受口３２の端部に噴射パターンがかかる位置までスプレーガン１が後退して、受口端部の塗装が済めば、液体塗料と圧縮空気の噴射を止める。そのまま、スプレーガンヘッド１１が鋳鉄管の外に退避するまで、スプレーガン１は後退する。
The painting operation will be described in detail. First, the spray gun 1 moves (advances) along the axial direction of the pipe in order to insert the spray gun head 11 waiting outside the pipe into the receiving port. When the spray pattern reaches the position where the spray pattern is applied to the end of the receiving port 32, the liquid paint and compressed air are started to be sprayed, and the liquid paint and air are mixed and atomized like a mist to be sprayed on the inner surface of the receiving port. Go. The spray gun 1 is moved forward to the point where the outline of the spray pattern is located at the boundary between the inner surface of the cylindrical portion 31 and the body portion 35, and the forward coating of C1 is performed.
Subsequently, the compressed air is stopped and only the liquid paint is sprayed, and the boundary (coating boundary) between the inner surface of the cylindrical portion 31 and the body portion 35 is finished (coating of C2). When painting is completed, the spray gun 1 is retracted along the axial direction of the tube. Simultaneously with the start of retreat, the spraying of the liquid paint is stopped, and only compressed air is jetted for about 0.5 seconds to accelerate the drying of the paint. Thereafter, the liquid paint is also sprayed, and while the spray gun 1 moves (retreats) in the axial direction, the liquid paint and air are mixed and sprayed on the inner surface of the receiving port to perform the return coating of C1.
When the spray gun 1 is retracted to a position where the spray pattern is applied to the end of the receiving port 32 and the coating of the receiving end is completed, the spraying of liquid paint and compressed air is stopped. The spray gun 1 moves backward until the spray gun head 11 is retracted out of the cast iron pipe.
なお、塗装中は、受口３２の端から外に流れ出るように鋳鉄管３の中に風を流している（図１（ａ）参照）。この送風により、塗料が胴付部３５を越えて筒部３１の内面に侵入することを防いでいる。その風速は、２〜１１ｍ／秒の範囲で管理されている。２ｍ／秒未満では、塗装時に塗料が胴付部３５を越えて奥まで飛散しやすくなり、１１ｍ／秒を越えると、塗料の噴射パターンが変形し、塗り漏れが発生しやすくなる。 In addition, during painting, the wind is flowing in the cast iron pipe 3 so that it may flow out from the end of the receiving port 32 (refer Fig.1 (a)). This blowing prevents the paint from entering the inner surface of the cylindrical portion 31 beyond the body portion 35. The wind speed is managed in the range of 2-11 m / sec. If it is less than 2 m / sec, the paint is likely to scatter to the back beyond the body portion 35 at the time of painting, and if it exceeds 11 m / sec, the spray pattern of the paint is deformed and coating omission is likely to occur.
図２は、第１の実施形態で使用されるスプレーガンヘッドの説明図である。
（ａ）や（ｂ）に示すように、スプレーガンヘッド１１の内部でも圧縮空気と液体塗料の流路は分かれていて、液体塗料がヘッドの軸心寄り（中心側）の流路を通るのに対し、圧縮空気はその外側に設けられた流路を通る。
液体塗料は、ノズルチップ１１０の吐出口１１１から微粒化されて吹き出し、噴射流をつくる。
圧縮空気は、ノズルチップ先端の前方に開口した噴気口１１２から液体塗料の噴射流に向けて吹き出し、塗料の微粒化をさらに促進させて霧のような微粒子に変え、液体塗料の噴射流を塗料と空気の混ざった微粒子の噴射パターン２にする。
また、圧縮空気は、塗料と空気が混ざった噴射パターン２の外縁全体を包むエアカーテンのように円錐状の気流２２を作り、噴射パターン２の拡散を規制するようにも働く。
圧縮空気の吹き出しを止めると、液体塗料のみがノズルチップ１１０の吐出口１１１から噴射される。
FIG. 2 is an explanatory diagram of a spray gun head used in the first embodiment.
As shown in (a) and (b), the flow path of the compressed air and the liquid paint is also divided inside the spray gun head 11, and the liquid paint passes through the flow path closer to the axis of the head (center side). On the other hand, the compressed air passes through a flow path provided outside the compressed air.
The liquid paint is atomized from the discharge port 111 of the nozzle chip 110 and blown out to create a jet flow.
Compressed air is blown out toward the jet flow of the liquid paint from the nozzle 112 opened in front of the tip of the nozzle tip, and further promotes atomization of the paint to change it into fine particles such as mist. And spray pattern 2 of fine particles mixed with air.
Further, the compressed air creates a conical air flow 22 like an air curtain that wraps the entire outer edge of the spray pattern 2 in which the paint and air are mixed, and also acts to regulate the diffusion of the spray pattern 2.
When the blowing of compressed air is stopped, only the liquid paint is ejected from the discharge port 111 of the nozzle tip 110.
図３（ａ）は、本実施形態のスプレーガンヘッド１１を使って圧縮空気の有無による噴射パターンの形状の違いを確認した図であり、スプレーガンヘッド１１を固定して平坦な塗装面に向けて塗料を短時間だけ吹き付けた時の様子を表している。
図の左側に示すように、圧縮空気を止めた状態（エアＯＦＦ状態）では、塗膜周縁２１の膜厚も一定しており、周縁２１がほぼ垂直に立ち上がった状態で、明確になっている。
ここで、αは、塗料の噴射パターンの拡散角度を示している。
右側の圧縮空気を流した状態（エアＯＮ状態）では、塗膜の周縁付近の膜厚が外側に漸次減少し、塗膜周縁２１の立ち上がりは傾いて、なだらかな勾配をつくっている。
また、塗装面における平面視では塗膜が長い楕円形状となっている。管の受口内面の塗装を行うときは、この楕円形状の長径が管の軸方向に合うように、スプレーガンヘッド１１の取り付け向きを調節する。
FIG. 3A is a diagram in which the spray gun head 11 of the present embodiment is used to confirm the difference in the shape of the spray pattern depending on the presence or absence of compressed air. The spray gun head 11 is fixed and the paint is directed toward a flat paint surface. Represents the state of spraying for a short time.
As shown on the left side of the figure, in the state where the compressed air is stopped (air OFF state), the film thickness of the coating film peripheral edge 21 is also constant, and it is clear that the peripheral edge 21 rises almost vertically. .
Here, α represents the diffusion angle of the spray pattern of the paint.
In a state in which compressed air on the right side is flowed (air ON state), the film thickness near the periphery of the coating film gradually decreases outward, the rising edge of the coating film periphery 21 is inclined, and a gentle gradient is created.
Moreover, the coating film has a long oval shape in plan view on the painted surface. When painting the inner surface of the tube receiving opening, the mounting direction of the spray gun head 11 is adjusted so that the major axis of the elliptical shape matches the axial direction of the tube.
このスプレーガンのノズルチップ１１０は、いわゆるテールの発生を抑える構造となっており、テールレスチップと呼ばれている。そのため、本実施形態のスプレーガン１１を使用すれば、テールの発生を抑えて、より均一な膜厚で斑なく塗装を仕上げることができる。 The nozzle tip 110 of this spray gun has a structure that suppresses so-called tail generation, and is called a tailless tip. Therefore, by using the spray gun 11 of this embodiment, it is possible to suppress the generation of tails and finish the coating with a more uniform film thickness without spots.
図３（ｂ）は、本実施形態により塗装した受口内面の仕上がり状態を示す説明図である。
受口内面のうち、端面側のＣ１の範囲は、圧縮空気と液体塗料を混ぜて吹き付ける範囲であり、筒部側のＣ２は圧縮空気を止めて液体塗料のみを吹き付ける範囲である。Ｃ１、Ｃ２ともに一定の厚み（約１００μｍ）で塗膜が付けられる。溝３３や突条３４の表面も一定の膜厚で塗装され、胴付部３５における塗り際も美しく仕上がっており、筒部３１の粉体樹脂層３６表面への塗料の飛散もない。
FIG. 3B is an explanatory view showing the finished state of the inner surface of the receptacle painted according to this embodiment.
The range of C1 on the end face side of the inner surface of the receiving port is a range in which compressed air and liquid paint are mixed and sprayed, and C2 on the cylinder side is a range in which only compressed liquid paint is sprayed with the compressed air stopped. Both C1 and C2 are coated with a constant thickness (about 100 μm). The surfaces of the grooves 33 and the ridges 34 are also coated with a constant film thickness, and the coating on the body portion 35 is finished beautifully, and there is no scattering of the paint on the surface of the powder resin layer 36 of the cylindrical portion 31.
本実施形態においては、ノズルチップ１１０は、図２（ａ）や図４（ａ）に示すように、正面視で吐出口が四角形状に見えるテールレスチップを使用した。ノズルチップは、このようなテールレスチップの他に、図４（ｃ）に示すように、正面視で吐出口が長楕円形状（ネコの目形状）に見えるものを使用することもできる。
ノズルチップの吐出口形状や噴射パターンの拡散角度αを変えて実験を行い、最適なノズルチップを確認した。実験結果を表１にまとめる。
Experiments were performed by changing the nozzle tip ejection port shape and the spray pattern diffusion angle α, and the optimum nozzle tip was confirmed. The experimental results are summarized in Table 1.
ノズルチップは、正面視で吐出口が長楕円形状（ネコの目形状）に見えるものを使用した場合に比べて、正面視で吐出口が四角形状に見えるものを使用したほうが、ノズルでの塗料詰まりが起こりにくく、その上、塗装仕上がりに螺旋縞模様が生じず、美しく仕上がった。
噴射パターンの拡散角度αは、４０度や６０度のものを使用した場合、溝や突条の側壁の塗料膜厚が薄くなったが、８０度や１１０度のものを使用した場合は、溝や突条の側壁でも塗料の膜厚を確保でき、その上、塗装仕上がりに螺旋模様が生じず、美しく仕上がった。
Compared to the nozzle tip that has a long oval shape (the shape of a cat's eye) when viewed from the front, it is better to use a nozzle tip that looks like a square when viewed from the front. The clogging is less likely to occur, and the paint finish is beautiful with no spiral stripes.
When the spray pattern has a diffusion angle α of 40 degrees or 60 degrees, the coating film thickness on the side walls of the grooves or ridges is reduced. In addition, the film thickness of the paint can be secured even on the side walls of the ridges and protrusions, and in addition, a spiral pattern does not occur in the finish of the coating, resulting in a beautiful finish.
図５は、比較例の説明図であり、（ａ）は、比較例１の塗装方法を示し、直角に曲げた塗装ランス１２の先端にエアレススプレーガン１ｂを取り付け、塗料の噴射向きを管の径方向に合わせて下向きにして受口内面を塗装するものである。
（ｂ）は、２基のエアレススプレーガンを用い、一方は鋭角に折り返した塗装ランス１２の先端に取り付け、塗料の噴射向きを、管の径方向から塗装ランス１２の後方（根本側）へ傾け、他方は鈍角に折り曲げた塗装ランス１２’の先端に取り付け、塗料の噴射向きを塗装ランス１２’の前方（先端側）に傾けて塗装するものである。
（ｃ）は、エアスプレーガン１ａの向きを管の径方向に合わせて受口内面に向けて、周知の使用方法、つまり液体塗料と圧縮空気の吹き出しと停止を同時に行う使用方法で、塗装するものである。
比較例１〜３に関するその他の塗装条件、例えば管の回転やスプレーガンの軸移動などは、既述の背景技術や第１の実施形態と同様である。
FIG. 5 is an explanatory view of a comparative example. FIG. 5A shows the coating method of the comparative example 1. The airless spray gun 1b is attached to the tip of the coating lance 12 bent at a right angle, and the spray direction of the paint is set to the pipe. The inner surface of the receptacle is painted downward according to the radial direction.
(B) uses two airless spray guns, one of which is attached to the tip of the coating lance 12 folded at an acute angle, and tilts the spraying direction of the paint from the radial direction of the pipe to the rear (base side) of the coating lance 12. The other is attached to the tip of a paint lance 12 'bent at an obtuse angle, and the paint is sprayed in the forward direction (tip side) of the paint lance 12' for painting.
(C) The air spray gun 1a is oriented in the radial direction of the tube and directed toward the inner surface of the receiving port, and is applied by a well-known method of use, that is, a method of simultaneously blowing out and stopping liquid paint and compressed air. Is.
Other coating conditions relating to Comparative Examples 1 to 3, such as the rotation of the tube and the axis movement of the spray gun, are the same as those in the background art and the first embodiment described above.
比較例１〜３の受口内面塗装結果を表２にまとめる。
表２に示すように、比較例１では、胴付部３５の塗り際は美しく仕上がったが、溝の側壁３７に塗り漏れ（塗り残し）が発生し、溝の底面３９には塗り溜まりが生じた。（図５（ａ）の破線部と太線部を参照）
比較例２では、胴付部３５の塗り際は美しく仕上がったが、溝の底面３９に塗り溜まりが発生した。（図５（ｂ）の太線部を参照）
比較例３では、塗料の乾きが良く、溝や突条など凹凸部の塗装は美しく仕上がったが、胴付部３５の塗り際を明確に仕上がることが出来ず、胴付部３５を越えて奥の筒部３１の内面まで塗料の飛散が生じた。（図５（ｃ）の太線部を参照）
As shown in Table 2, in Comparative Example 1, when the body portion 35 was painted, it was finished beautifully, but omission (unpainted) was generated on the side wall 37 of the groove, and coating was generated on the bottom surface 39 of the groove. It was. (Refer to the broken line part and the thick line part in FIG. 5A.)
In Comparative Example 2, the body portion 35 was painted beautifully, but a coating pool was generated on the bottom surface 39 of the groove. (Refer to the thick line part in FIG. 5 (b))
In Comparative Example 3, the paint dries well and the uneven portions such as grooves and ridges were beautifully finished, but the finish of the body portion 35 could not be clearly finished, and beyond the body portion 35 Scattering of the paint occurred up to the inner surface of the cylindrical portion 31. (Refer to the thick line part in FIG. 5 (c))
図６は、本発明の第２の実施形態を示す図である。
第１の実施形態では、１基のスプレーガンを使って、液体塗料を圧縮空気と混ぜて吹き付けたり、圧縮空気を止めて液体塗料のみを噴射したりしたが、この図のように、２基のスプレーガンを並列に配置し、一方をエアスプレーガン１ａ、他方をエアレススプレーガン１ｂとすることができる。
凹凸部（溝や突条）を含む塗装範囲Ｃ１では、エアレススプレーを止めてエアスプレーガン１ａのみを使って液体塗料を圧縮空気と混ぜて吹き付けて塗装し、その奥の胴付部付近（Ｃ２）では、エアスプレーからの液体塗料の噴射と圧縮空気の噴気を止めて、エアレススプレーガン１ｂのみを使って液体塗料を噴射して塗装を行う。
このようにすれば、第１の実施形態と同様に、凹凸部分で均一な厚みの塗膜を得て、かつ、筒部３１の内面と胴付部３５との塗装境界の塗り際を美しく仕上げることができる。
FIG. 6 is a diagram showing a second embodiment of the present invention.
In the first embodiment, using one spray gun, liquid paint is mixed with compressed air and sprayed, or compressed air is stopped and only liquid paint is sprayed. These spray guns can be arranged in parallel, with one being an air spray gun 1a and the other being an airless spray gun 1b.
In the painting range C1 including uneven portions (grooves and ridges), the airless spray is stopped, the liquid paint is mixed with the compressed air and sprayed using only the air spray gun 1a, and the vicinity of the trunk portion (C2) ), The spraying of the liquid paint from the air spray and the blowing of the compressed air are stopped, and the liquid paint is sprayed using only the airless spray gun 1b for coating.
If it does in this way, similarly to 1st Embodiment, the coating film of uniform thickness will be obtained in an uneven | corrugated | grooved part, and the painting process of the coating boundary of the inner surface of the cylinder part 31 and the trunk | drum 35 will be finished beautifully. be able to.
なお、各実施形態では、被塗装材として、筒部の内面に粉体樹脂塗装が施されている鋳鉄管を例示したが、粉体樹脂塗装の代わりに筒部の内面に他の樹脂やセメントモルタルをライニングした管でもよい。また、鋳鉄管に限らず、凹凸部分で均一な厚みの塗膜を得て、かつ、塗装境界の塗り際を美しく仕上げる必要がある被塗装材であれば、本発明を適用し得る。 In each embodiment, the cast iron pipe whose powder resin coating is applied to the inner surface of the cylindrical portion is exemplified as the material to be coated. However, instead of powder resin coating, another resin or cement is used on the inner surface of the cylindrical portion. It may be a tube lined with mortar. Further, the present invention can be applied to any material to be coated that is not limited to a cast iron pipe and is required to obtain a coating film having a uniform thickness at an uneven portion and to finish the coating boundary beautifully.
１ スプレーガン
１ａ エアスプレーガン
１ｂ エアレススプレーガン
１１ スプレーガンヘッド
１１０ ノズルチップ（テールレスチップ）
１１０’ ノズルチップ
１１１ 吐出口（四角形状）
１１１’ 吐出口（長楕円形状）
１１２ 噴気口
１２ 塗装ランス
１３ 塗料配管
１４ 圧縮空気配管
１５ 混合装置
２ 噴射パターン
２１ 周縁
２２ 気流
３ 鋳鉄管（被塗装材）
３１ 筒部
３２ 受口
３３ 溝
３４ 突条
３５ 胴付部
３６ 粉体樹脂層
３７ 側壁
３８ 塗装境界
３９ 底面
Ｃ 塗装範囲
Ｒ ローラー
1 spray gun 1a air spray gun 1b airless spray gun 11 spray gun head 110 nozzle tip (tailless tip)
110 'nozzle tip 111 discharge port (square shape)
111 'discharge port (long oval shape)
112 Fume port 12 Paint lance 13 Paint pipe 14 Compressed air pipe 15 Mixing device 2 Spray pattern 21 Edge 22 Air flow 3 Cast iron pipe (material to be coated)
31 cylindrical portion 32 receiving port 33 groove 34 ridge 35 barrel portion 36 powder resin layer 37 side wall 38 coating boundary 39 bottom surface C coating range R roller
Claims (1)
鋳鉄管の受口端部からスプレーガンヘッドを挿入し、凹凸部の塗装はスプレーガンヘッドから液体塗料を圧縮空気と混ぜて受口の内表面に向けて吹き付け、塗装面の周縁となる筒部内面と胴付部との境界の塗装は前記スプレーガンヘッドから前記液体塗料のみを受口の内表面に向けて噴射し、前記凹凸部の塗装と塗装面周縁の塗装を同一のスプレーガンヘッドで続けて行うとともに、塗装中は鋳鉄管の受口の端から外に流れ出るように鋳鉄管の中に風を流すことを特徴とする塗装方法。 It is a painting method that paints the uneven part of the inner surface of the cast iron pipe without any unevenness, and clarifies the edge of the paint surface,
The spray gun head is inserted from the receiving end of the cast iron pipe, and the coating of the uneven part is mixed with compressed air from the spray gun head and sprayed toward the inner surface of the receiving port, line painting of the boundary between the barrel attaching portion continuing only the liquid coating material from the spray gun heads and ejected toward the inner surface of the receptacle, the paint coating and the coated surface peripheral edge of the front Symbol uneven portion in the same spray gun head Utotomoni, painting how to characterized by flowing the air into the cast iron pipe to flow out to the outside during the painting from the end of the socket of the cast iron pipe.
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| JP2012172454A JP5611287B2 (en) | 2011-08-09 | 2012-08-03 | Painting method |
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| JP2011173790 | 2011-08-09 | ||
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| NL2012409B1 (en) * | 2014-03-12 | 2015-11-26 | Saba Dinxperlo B V | Improved low pressure 2-K handheld spray gun. |
| CN106903016B (en) * | 2017-02-23 | 2019-01-22 | 安徽工业大学 | A kind of spray equipment for inner surface of pipe fitting |
| JP7348707B2 (en) * | 2019-10-03 | 2023-09-21 | 関西ペイント株式会社 | Roof decoration painting method |
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| JPS60183065A (en) * | 1984-02-28 | 1985-09-18 | Kubota Ltd | Apparatus for coating inner surface of pipe socket |
| JPH082429B2 (en) * | 1990-03-17 | 1996-01-17 | アロイ工器株式会社 | Painting method and painting equipment |
| JP3223690B2 (en) * | 1994-03-10 | 2001-10-29 | 日産自動車株式会社 | Painting parting method |
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