JP5251233B2 - How to paint the cylinder - Google Patents

How to paint the cylinder Download PDF

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JP5251233B2
JP5251233B2 JP2008116922A JP2008116922A JP5251233B2 JP 5251233 B2 JP5251233 B2 JP 5251233B2 JP 2008116922 A JP2008116922 A JP 2008116922A JP 2008116922 A JP2008116922 A JP 2008116922A JP 5251233 B2 JP5251233 B2 JP 5251233B2
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cylinder
coating film
coating
spray gun
cylindrical body
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JP2009262094A (en
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浩一郎 林
麻紀子 斉藤
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IHI Corp
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Description

本発明は、筒体、特にシャフトのように長さが長く更に長手方向で部分的に断面形状が変化するような筒体の内表面及び外表面に一定膜厚の塗装膜を形成するようにした筒体の塗装方法に関する。   The present invention is to form a coating film having a constant film thickness on the inner surface and the outer surface of a cylindrical body, particularly a cylindrical body having a long length and a sectional shape partially changing in the longitudinal direction. The present invention relates to a method for painting a cylinder.

例えばシャフトには、図１３に一例を示すように例えば直径が１５０ｍｍ前後で長さが３０００ｍｍ前後のような細長い筒体１によって構成されたものがあり、このようなシャフトは、断面形状が長手方向において均一ではなく、内表面及び外表面の夫々に部分的な凹凸部Ａが形成されているものがある。そして、このようなシャフトにおいて、内表面と外表面に５０〜６０μｍの薄い膜厚の塗装膜を形成することが実施されており、この塗装膜は塗布後に焼き付け処理を行って筒体と一体化しているがこの焼き付け処理の安定性を保持するために前記塗装膜の膜厚の誤差を３０μｍ程度内に収めるという厳しい要求がある。   For example, as shown in FIG. 13, for example, a shaft includes a long cylindrical body 1 having a diameter of about 150 mm and a length of about 3000 mm. Such a shaft has a cross-sectional shape in the longitudinal direction. In some cases, partial uneven portions A are formed on the inner surface and the outer surface, respectively. In such a shaft, a thin coating film having a thickness of 50 to 60 μm is formed on the inner surface and the outer surface, and this coating film is baked after application and integrated with the cylinder. However, in order to maintain the stability of this baking process, there is a strict requirement that the film thickness error of the coating film be within about 30 μm.

従来、このようなシャフトの内表面を塗装する際は、長尺のアームの先端に周方向全周へ向けて塗料を噴射するようにしたスプレーガンを取り付けたスプレー装置を用意し、作業員がアームを把持してスプレーガンを筒体内に挿入することにより塗布していた。又、筒体の外表面を塗装する際は、作業員がスプレーガンを手で把持して塗布していた。   Conventionally, when painting the inner surface of such a shaft, a spray device with a spray gun attached to the tip of a long arm that sprays paint toward the entire circumference is prepared. It was applied by holding the arm and inserting a spray gun into the cylinder. Further, when painting the outer surface of the cylindrical body, the worker has applied it by holding the spray gun by hand.

前記したように５０〜６０μｍの薄い膜厚を均一に塗布するために、従来は１０μｍ以下程度の極めて薄い塗装膜を６〜７回重ねて塗布するようにしているが、従来は前記したように作業員が手作業で行っているために、５０〜６０μｍのような薄い塗装膜を均一に塗布することは難しく、塗装には熟練を要していた。特にシャフトの内表面を塗布する際は目視によって確認することができないために熟練した作業員によっても均一な塗装を行うことは非常に困難であり、しかも塗装作業に長時間を要するという問題を有していた。   As described above, in order to uniformly apply a thin film thickness of 50 to 60 μm, conventionally, an extremely thin coating film of about 10 μm or less is applied 6 to 7 times repeatedly. Since the workers are performing manually, it is difficult to uniformly apply a thin coating film such as 50 to 60 μm, and skill is required for painting. In particular, when the inner surface of the shaft is applied, it cannot be visually confirmed, so it is very difficult for even a skilled worker to perform uniform coating, and the painting operation takes a long time. Was.

一方、電子写真用感光ドラムのような筒体を回転させ、ノズルヘッドを回転軸と平行に移動させて筒体の外表面に連続した塗布膜を形成するものがある（特許文献１参照）。   On the other hand, there is a type in which a cylindrical body such as an electrophotographic photosensitive drum is rotated and a nozzle head is moved in parallel with a rotation axis to form a continuous coating film on the outer surface of the cylindrical body (see Patent Document 1).

又、塗布剤を略一定の吐出流量で塗布ガンから噴出させ、その時の塗布剤の塗布パターン幅を検知するパターン幅検知工程と、検知された塗布パターン幅を目標パターン幅と比較し、両パターン幅の偏差に基づき、両パターン幅を一致させるための塗布ガンとワークとの距離を設定する距離設定工程とを備えることにより、塗布材の温度変化や粘性変化等によらずに、所定の目標パターン幅で塗布ガンから噴出させつつ塗布材を均一にワークに塗布するようにしたものがある（特許文献２参照）。
特開平０４−０７４５７０号公報 特開平０９−０２９１６４号公報 In addition, a pattern width detection process for detecting the coating pattern width of the coating agent at that time by ejecting the coating agent from the coating gun at a substantially constant discharge flow rate, and comparing the detected coating pattern width with the target pattern width. By providing a distance setting step for setting the distance between the application gun and the workpiece to match both pattern widths based on the width deviation, a predetermined target can be obtained regardless of the temperature change or viscosity change of the coating material. There is one in which a coating material is uniformly applied to a workpiece while being ejected from an application gun with a pattern width (see Patent Document 2).
Japanese Patent Laid-Open No. 04-074570 JP 09-029164 A

しかしながら、前記特許文献１は、電子写真用感光ドラムのような均一外径の筒体に適用するものであって、前記したシャフトのように断面形状が長手方向で部分的に変化する筒体の表面に適用した場合には、形状が変化する表面に塗装膜を一定膜厚で精度良く形成することはできず、又、特許文献２は、塗布パターン幅を目標パターン幅に一致させることはできても、単に目標パターン幅で塗装を行うのみでは、前記したシャフトのように断面形状が長手方向で部分的に変化する筒体の表面に適用した場合には、形状が変化する表面に塗装膜を一定膜厚で精度良く形成することはできないという問題がある。   However, Patent Document 1 is applied to a cylindrical body having a uniform outer diameter such as an electrophotographic photosensitive drum, and is a cylindrical body whose cross-sectional shape partially changes in the longitudinal direction as described above. When applied to the surface, the coating film cannot be accurately formed with a constant film thickness on the surface where the shape changes, and Patent Document 2 cannot make the coating pattern width coincide with the target pattern width. However, simply by painting with the target pattern width, when applied to the surface of a cylindrical body whose cross-sectional shape partially changes in the longitudinal direction, such as the shaft described above, a coating film is formed on the surface where the shape changes. There is a problem that the film cannot be formed with a constant film thickness with high accuracy.

本発明は、上記実情に鑑みてなしたもので、特にシャフトのように長手方向で部分的に断面形状が変化するような筒体の内表面及び外表面に一定膜厚の塗装膜を精度良く塗布できるようにした筒体の塗装方法を提供しようとするものである。   The present invention has been made in view of the above circumstances, and in particular, a coating film having a constant film thickness is accurately applied to the inner surface and the outer surface of a cylindrical body whose sectional shape partially changes in the longitudinal direction, such as a shaft. An object of the present invention is to provide a method of painting a cylinder that can be applied.

本発明は、筒体の内表面に一定膜厚の塗装膜を形成する筒体の塗装方法であって、
筒体の軸線を中心に回転駆動可能に支持する回転駆動手段と、移動手段により前記筒体の軸線と平行且つ筒体の内表面と間隔を隔てて移動し筒体の内表面に錐状に塗料を噴射するようにアームの先端に固定したスプレーガンと、該スプレーガンからの塗料の噴射量及び空気の噴射圧を調整して筒体内表面に塗布されるスポット径及び塗布量を調整するようにした圧力調節手段とを設け、
スプレーガンと筒体の長手方向内表面との相対距離を予め求めておき、
筒体内表面に塗布されるスポット径が前記相対距離に応じて一定に保持されるよう噴射圧を調整して筒体の回転とスプレーガンの移動とを行うことにより螺旋状の塗布パターンを形成し、同時に、前記相対距離の減少時にはスプレーガンの移動速度の増加と筒体の回転速度の増加を行い、又、前記相対距離の増加時にはスプレーガンの移動速度の減少と筒体の回転速度の減少を行うことにより、
筒体内表面に一定の塗布パターン幅で且つ一定のパターン間隔による一定膜厚の塗装膜を形成することを特徴とする筒体の塗装方法、に係るものである。 The present invention is a cylinder coating method for forming a coating film having a constant film thickness on the inner surface of a cylinder,
A rotation driving means for rotating drivable supported around the axis of the tubular body, the conical inner surface of the moving tubular body at a inner surface and spacing of parallel and cylindrical body the axis of the cylindrical body by the moving means adjusting the spray gun was fixed to the tip of the arm so as to inject the paint, the injection quantity and the spot diameter and the coating amount is applied to the adjustment to the cylindrical body surface injection pressure of the air of the paint from the spray gun And a pressure adjusting means as described above,
Obtain the relative distance between the spray gun and the longitudinal inner surface of the cylinder in advance,
Forming a spiral application pattern by the spot diameter which is applied to the cylindrical body surface to perform the movement of rotation and the spray gun of the tube body by adjusting the injection pressure to be kept constant in accordance with the relative distance At the same time, when the relative distance decreases, the spray gun moving speed increases and the cylinder rotation speed increases . When the relative distance increases, the spray gun movement speed decreases and the cylinder rotation speed increases. By making a decrease ,
Method of coating a cylindrical body and forming a coating film of uniform thickness by and constant pattern interval at a constant application pattern width tubular body surface is intended according to the,.

又、前記筒体の塗装方法において、螺旋状に塗布した塗装膜上に更に塗装膜を形成する際は、前回の塗布パターンに対して位相をずらした塗布パターンで塗布することが好ましい。   Further, in the method of coating the cylindrical body, when a coating film is further formed on the spirally coated coating film, it is preferably applied with a coating pattern whose phase is shifted from the previous coating pattern.

又、前記筒体の塗装方法において、筒体の表面に筒体の長手方向中間位置まで塗装膜を形成して塗布を停止した後、筒体を長手方向に反転し、残りの表面に前記停止位置である繋ぎ部まで塗装膜を形成することができる。   In the method of painting a cylinder, after a coating film is formed on the surface of the cylinder up to the middle position in the longitudinal direction of the cylinder and the application is stopped, the cylinder is reversed in the longitudinal direction and the stop is applied to the remaining surface. The coating film can be formed up to the connecting portion which is the position.

又、前記筒体の塗装方法において、繋ぎ部を有して形成された塗装膜上に更に塗装膜を形成する際は、前回の繋ぎ部とは異なる位置まで塗装膜を形成して塗布を停止した後、筒体を長手方向に反転し、残りの表面に今回の停止位置である繋ぎ部まで塗装膜を形成し、塗装膜の繋ぎ部が前回と今回とで重ならないようにすることができる。   In addition, in the method of painting the cylinder, when a coating film is further formed on the coating film formed with the joint portion, the coating film is formed at a position different from the previous joint portion and the coating is stopped. After that, the cylindrical body is inverted in the longitudinal direction, and the coating film is formed on the remaining surface up to the connecting portion which is the current stop position, so that the connecting portion of the coating film does not overlap with the previous time and this time. .

本発明の筒体の塗装方法によれば、スプレーガンと筒体表面との相対距離の変化に応じて筒体表面に塗布されるスポット径が常に一定に保持されるように噴射圧を調整した状態において、前記相対距離の減少時にはスプレーガンの移動速度と筒体の回転速度とを増加し、前記相対距離の増加時にはスプレーガンの移動速度と筒体の回転速度とを減少するようにしたので、筒体の断面形状が変化しても筒体表面に一定の塗布パターン幅で且つ塗布パターンが互いに一定の重なり幅でラップした一定膜厚の塗装膜を形成できるという優れた効果を奏し得る。   According to the cylinder coating method of the present invention, the spray pressure is adjusted so that the spot diameter applied to the cylinder surface is always kept constant according to the change in the relative distance between the spray gun and the cylinder surface. In the state, when the relative distance is decreased, the spray gun moving speed and the cylinder rotating speed are increased, and when the relative distance is increasing, the spray gun moving speed and the cylinder rotating speed are decreased. Even if the cross-sectional shape of the cylinder changes, it is possible to achieve an excellent effect that a coating film having a constant film thickness can be formed on the cylinder surface with a constant coating pattern width and the coating patterns wrapped with a constant overlap width.

以下、本発明の実施の形態を添付図面を参照して説明する。   Embodiments of the present invention will be described below with reference to the accompanying drawings.

図１は筒体の一部にコーン状に拡がった形状変化部を有する筒体の内表面に塗装膜を形成する場合の本発明の一例を示す側面図、図２は図１のＩＩ−ＩＩ方向矢視図である。図１、図２において、１は筒状の長手方向の一部にコーン拡径部２ａからなる形状変化部２を有する筒体、３は例えばローラ４により筒体１を支持して筒体１の軸線を中心に回転駆動するようにした回転駆動手段、５は移動手段１２に支持されているアーム６の先端に固定したスプレーガンである。移動手段１２は、前記筒体１の軸線と平行に設けたガイドレール７に沿って移動する移動台車８を備えており、アーム６を介して移動手段１２に支持されたスプレーガン５は、噴射口５ａが筒体１の内表面１ａとの間に所要の相対距離Ｌを有して移動するようになっている。   FIG. 1 is a side view showing an example of the present invention in the case where a coating film is formed on the inner surface of a cylinder having a shape-changing portion expanding in a cone shape in a part of the cylinder, and FIG. FIG. 1 and 2, reference numeral 1 denotes a cylindrical body having a shape changing portion 2 composed of a cone diameter increasing portion 2 a in a part of a cylindrical longitudinal direction, and 3 denotes a cylindrical body 1 by supporting the cylindrical body 1 by a roller 4, for example. Rotation driving means 5 that is driven to rotate about the axis of the spray gun 5 is a spray gun fixed to the tip of the arm 6 supported by the moving means 12. The moving means 12 includes a moving carriage 8 that moves along a guide rail 7 provided in parallel with the axis of the cylinder 1, and the spray gun 5 supported by the moving means 12 via the arm 6 The mouth 5a moves with a required relative distance L from the inner surface 1a of the cylinder 1.

前記スプレーガン５には塗料供給装置９により一定量の塗料が供給されるようになっており、更に、スプレーガン５には圧力調節手段１０からの任意の噴射圧Ｐに設定された加圧空気が供給されるようになっており、これによりスプレーガン５の噴射口５ａからは塗料が円錐状に噴射されて、筒体１の内表面１ａに所要のスポット径ｄで塗料を塗布するようになっている。   A predetermined amount of paint is supplied to the spray gun 5 by a paint supply device 9, and the spray gun 5 is pressurized air set to an arbitrary injection pressure P from the pressure adjusting means 10. As a result, the coating material is sprayed in a conical shape from the spray port 5a of the spray gun 5, and the coating material is applied to the inner surface 1a of the cylinder 1 with a required spot diameter d. It has become.

図３は筒体１の長手方向の一部にコーン拡径部２ａからなる形状変化部２を有する筒体１の外表面１ｂに塗装膜を形成する場合の本発明の一例を示すもので、図３では回転駆動手段３が筒体１の両端に嵌合して筒体１の軸線を中心に回転駆動する回転治具１１を備えた場合を示している。そしてこの場合のスプレーガン５は、該スプレーガン５の噴射口５ａと筒体１の外表面１ｂとの間に所要の相対距離Ｌを有して移動するようにガイドレール７に沿って移動する移動台車８にアーム６を介して固定されている。   FIG. 3 shows an example of the present invention in the case where a coating film is formed on the outer surface 1b of the cylindrical body 1 having the shape changing portion 2 composed of the cone enlarged portion 2a in a part of the longitudinal direction of the cylindrical body 1. FIG. 3 shows a case where the rotation driving means 3 is provided with a rotating jig 11 that is fitted to both ends of the cylinder 1 and is driven to rotate about the axis of the cylinder 1. In this case, the spray gun 5 moves along the guide rail 7 so as to move with a required relative distance L between the spray port 5a of the spray gun 5 and the outer surface 1b of the cylinder 1. It is fixed to the movable carriage 8 via the arm 6.

図４、図５は、前記スプレーガン５と筒体１の表面１ａ，１ｂとの相対距離Ｌと、スポット径ｄと、噴射圧Ｐの関係を示したもので、相対距離Ｌが大きくなるとスポット径ｄは大きくなり、相対距離Ｌが小さくなるとスポット径ｄは小さくなり、又、噴射圧Ｐが大きくなるとスポット径ｄは小さくなり、噴射圧Ｐが小さくなるとスポット径ｄは大きくなる関係を有している。   4 and 5 show the relationship between the relative distance L between the spray gun 5 and the surfaces 1a and 1b of the cylindrical body 1, the spot diameter d, and the injection pressure P. As the relative distance L increases, the spot is increased. When the diameter d increases and the relative distance L decreases, the spot diameter d decreases. When the injection pressure P increases, the spot diameter d decreases. When the injection pressure P decreases, the spot diameter d increases. ing.

次に、上記図示例の作動を説明する。   Next, the operation of the illustrated example will be described.

図１、図３の装置によって筒体１の塗装を行うには、先ずスプレーガン５と筒体１の長手方向の表面１ａ，１ｂとの相対距離Ｌを計測する。この時、筒体１の形状寸法については製造の段階におけるデータが存在しているので、このデータに基づき、筒体１の軸線と平行に移動するスプレーガン５と表面１ａ，１ｂとの間隔位置を設定することで、相対距離Ｌは容易に求めることができる。この相対距離Ｌは図示しないパーソナルコンピュータ等の制御装置に入力する。図１の例では、スプレーガン５の噴射口５ａの位置を筒体１の軸線に一致させているが、スプレーガン５と筒体１の表面１ａ，１ｂとの間隔はスポット径ｄの大きさや噴射時の気流の乱れ等を考慮して任意に設定することができる。   In order to coat the cylinder 1 with the apparatus shown in FIGS. 1 and 3, first, the relative distance L between the spray gun 5 and the longitudinal surfaces 1a and 1b of the cylinder 1 is measured. At this time, since there is data at the manufacturing stage regarding the shape and dimensions of the cylinder 1, the position of the gap between the spray gun 5 that moves parallel to the axis of the cylinder 1 and the surfaces 1 a and 1 b based on this data. Is set, the relative distance L can be easily obtained. This relative distance L is input to a control device such as a personal computer (not shown). In the example of FIG. 1, the position of the spray port 5a of the spray gun 5 is made to coincide with the axis of the cylinder 1, but the distance between the spray gun 5 and the surfaces 1a, 1b of the cylinder 1 is the size of the spot diameter d, It can be arbitrarily set in consideration of the turbulence of the air flow during the injection.

図１における筒体１の内表面１ａを塗装する場合と、図３における筒体１の外表面１ｂを塗装する場合とは、全く同一の方法を用いて塗装することができるので、以下では、図１における筒体１の内表面１ａを塗装する場合について説明し、図３における筒体１の外表面１ｂを塗装する場合については説明を省略する。   Since the case where the inner surface 1a of the cylindrical body 1 in FIG. 1 is painted and the case where the outer surface 1b of the cylindrical body 1 in FIG. 3 is painted can be applied using exactly the same method, The case of coating the inner surface 1a of the cylinder 1 in FIG. 1 will be described, and the description of the case of coating the outer surface 1b of the cylinder 1 in FIG. 3 will be omitted.

前記スプレーガン５には、塗料供給装置９により一定量の塗料が供給され、且つ圧力調節手段１０によって噴射圧Ｐに調節された加圧空気が供給されているので、スプレーガン５からは一定量の塗料が加圧空気により円錐状に噴射され、筒体１の内表面１ａにスポット状に塗布される。ここで、図６に示すように、スプレーガン５と筒体１の内表面１ａとの相対距離Ｌが一定である平坦部においては、スポット径ｄ（図４参照）が所望の設定値になるようにスプレーガン５に供給する空気の噴射圧Ｐを一定の設定圧Ｐ1に設定する。又、スプレーガン５と内表面１ａとの相対距離Ｌが増加するコーン拡径部２ａにおいては、前記設定されたスポット径ｄと同一の径が保持されるように、相対距離Ｌの増加に応じてスプレーガン５の噴射圧Ｐを増加させる設定圧Ｐ2に設定する。 The spray gun 5 is supplied with a certain amount of paint by the paint supply device 9 and is supplied with pressurized air adjusted to the injection pressure P by the pressure adjusting means 10. Is sprayed in a conical shape by pressurized air and applied to the inner surface 1a of the cylindrical body 1 in a spot shape. Here, as shown in FIG. 6, in a flat portion where the relative distance L between the spray gun 5 and the inner surface 1a of the cylinder 1 is constant, the spot diameter d (see FIG. 4) becomes a desired set value. Thus, the injection pressure P of the air supplied to the spray gun 5 is set to a constant set pressure P 1 . Further, in the cone enlarged portion 2a where the relative distance L between the spray gun 5 and the inner surface 1a is increased, the same diameter as the set spot diameter d is maintained so that the relative distance L increases. Then, the set pressure P 2 for increasing the spray pressure P of the spray gun 5 is set.

同時に、スプレーガン５と内表面１ａとの相対距離Ｌが一定の平坦部においては、図７に示すように前記設定されたスポット径ｄによる塗布パターン１３が相互に所要の間隔を保持して（塗布パターン１３が相互に一定の重なり幅ａでラップして）設定された膜厚になるようにスプレーガン５の移動速度と筒体１の回転速度とを設定する。一方、スプレーガン５と内表面１ａとの相対距離Ｌが増加するコーン拡径部２ａにおいては、前記一定の重なり幅ａを保持し且つ設定された膜厚になるように図６に示す如くスプレーガン５の移動速度と筒体１の回転速度を相対距離Ｌに応じて減少させるように制御する。   At the same time, in the flat portion where the relative distance L between the spray gun 5 and the inner surface 1a is constant, the coating pattern 13 with the set spot diameter d maintains a predetermined distance from each other as shown in FIG. The moving speed of the spray gun 5 and the rotational speed of the cylinder 1 are set so that the coating pattern 13 has a set film thickness (wrapped with a constant overlap width a). On the other hand, in the cone enlarged portion 2a where the relative distance L between the spray gun 5 and the inner surface 1a increases, spraying is performed as shown in FIG. 6 so as to maintain the constant overlap width a and to have a set film thickness. Control is performed so that the moving speed of the gun 5 and the rotational speed of the cylinder 1 are decreased according to the relative distance L.

上記スプレーガン５の移動速度と筒体１の回転速度の関係については、図８を参照して行う以下の方法によって設定することができる。図８中、太い矢印は前回と今回の塗布パターンの方向を示す軌跡であり、Ｖｓはスプレーガン５の移動速度、Ｖｐはスポットが筒体１の内表面１ａを移動する塗装速度、Ｓ１はピッチ周期、θはピッチ角、ｄはスポット径、ａはスポット径の重なり幅である。   The relationship between the moving speed of the spray gun 5 and the rotational speed of the cylinder 1 can be set by the following method performed with reference to FIG. In FIG. 8, thick arrows are trajectories indicating the direction of the previous and current coating patterns, Vs is the moving speed of the spray gun 5, Vp is the coating speed at which the spot moves on the inner surface 1a of the cylinder 1, and S1 is the pitch. The period, θ is the pitch angle, d is the spot diameter, and a is the overlapping width of the spot diameters.

先ず、塗装速度Ｖｐを一定とするためには、筒体１の回転速度をωとすると

Figure 0005251233
ｒ：筒体１の半径
である。 First, in order to make the coating speed Vp constant, the rotational speed of the cylinder 1 is ω.
Figure 0005251233
 r: radius of the cylinder 1

又、塗布パターンの重なり幅ａを一定にするためには

Figure 0005251233
Ｓ０＝ｄ−ａ
Figure 0005251233
 である。 In order to make the overlap width a of the coating pattern constant,
Figure 0005251233
 S0 = da
Figure 0005251233
 It is.

上記式をスプレーガン５の移動速度Ｖｓと筒体１の回転速度ωについて解くと、

Figure 0005251233
Figure 0005251233
 となる。 Solving the above equation for the moving speed Vs of the spray gun 5 and the rotational speed ω of the cylinder 1,
Figure 0005251233
Figure 0005251233
 It becomes.

図６の原点Ｏを始点として塗装を開始し、予め求められているスプレーガン５と筒体１の内表面１ａとの相対距離Ｌに基づいて、前記噴射圧Ｐと、スプレーガン５の移動速度Ｖｓと、筒体１の回転速度ωを自動的に制御すると、筒体１の内表面１ａには、図７、図８に示すように一定幅の塗布パターン１３が一定の塗布パターン間隔Ｓ０を有して（塗布パターン１３が円の場合には塗布パターン１３が相互に一定の重なり幅ａでラップして）一定の膜厚を有する螺旋状の塗装膜が形成されるようになる。   Coating is started with the origin O in FIG. 6 as a starting point, and the spray pressure P and the moving speed of the spray gun 5 are determined based on the relative distance L between the spray gun 5 and the inner surface 1a of the cylindrical body 1 obtained in advance. When Vs and the rotational speed ω of the cylinder 1 are automatically controlled, the application pattern 13 having a constant width is formed on the inner surface 1a of the cylinder 1 with a constant application pattern interval S0 as shown in FIGS. Thus, when the coating pattern 13 is a circle, the coating pattern 13 wraps around each other with a certain overlapping width a, and a spiral coating film having a certain film thickness is formed.

上記したように、筒体１の内表面１ａに塗布されるスポット径ｄがスプレーガン５と内表面１ａとの相対距離Ｌの変化に応じて常に一定に保持されるよう噴射圧Ｐを調整した状態において、前記相対距離Ｌの減少時には、スプレーガン５の移動速度を増加させると同時に筒体１の回転速度を増加させる制御を行う。 As described above, the injection pressure P is adjusted so that the spot diameter d applied to the inner surface 1a of the cylinder 1 is always kept constant according to the change in the relative distance L between the spray gun 5 and the inner surface 1a. In the state, when the relative distance L is decreased, control is performed to increase the rotational speed of the cylinder 1 at the same time as increasing the moving speed of the spray gun 5.

又、前記相対距離Ｌの増加時には、スプレーガン５の移動速度を減少させると同時に筒体１の回転速度を減少させる制御を行う。 Further, when the relative distance L is increased, control is performed to decrease the moving speed of the spray gun 5 and at the same time decrease the rotational speed of the cylinder 1.

このように、筒体１の内表面１ａに塗布されるスポット径ｄが常に一定になるように噴射圧Ｐを調整した状態において、スプレーガン５と内表面１ａとの相対距離Ｌに応じてスプレーガン５の移動速度Ｖｓと筒体１の回転速度ωとを制御することにより、筒体１の断面形状が変化しても内表面１ａに一定の塗布パターン幅で且つ塗布パターン１３が互いに一定の重なり幅ａでラップした一定膜厚の塗装膜を精度良く形成することができる。   As described above, in a state where the spray pressure P is adjusted so that the spot diameter d applied to the inner surface 1a of the cylindrical body 1 is always constant, spraying is performed according to the relative distance L between the spray gun 5 and the inner surface 1a. By controlling the moving speed Vs of the gun 5 and the rotational speed ω of the cylinder 1, the application pattern 13 has a constant application pattern width and a constant application pattern 13 on the inner surface 1 a even if the cross-sectional shape of the cylinder 1 changes. A coating film having a constant film thickness that is wrapped with the overlap width a can be formed with high accuracy.

この時、前記塗布パターン１３が楕円の場合には、塗布パターン間隔Ｓ０を一定にすると、塗布パターン１３の重なり幅ａが変化することになるため、この場合には塗布パターン１３の重なり幅ａが一定になるように、スプレーガン５の移動速度Ｖｓと、筒体１の回転速度ωを補正するようにしてもよい。   At this time, when the coating pattern 13 is an ellipse, the overlapping width a of the coating pattern 13 changes if the coating pattern interval S0 is constant. In this case, the overlapping width a of the coating pattern 13 is The moving speed Vs of the spray gun 5 and the rotational speed ω of the cylinder 1 may be corrected so as to be constant.

又、上記したように筒体１の内表面１ａに形成した塗装膜上に、更に塗装膜を形成する際には、図９に示すように、前回の塗布パターン１３ａに対して位相をずらした塗布パターン１３ｂ，１３ｃで塗布することが好ましい。図９では塗布パターン１３ａの１ピッチの中に更に２つの塗装膜が形成されるように位相を１／３ずつずらして重ね塗りした場合を示しているが、位相をずらす回数は重ね塗りの回数に応じて任意に設定することができる。又、位相をずらす方法としては、塗装作業の始点を図６の原点０からずらすことで行うことができる。   Further, when a coating film is further formed on the coating film formed on the inner surface 1a of the cylindrical body 1 as described above, the phase is shifted with respect to the previous coating pattern 13a as shown in FIG. It is preferable to apply with the application patterns 13b and 13c. FIG. 9 shows a case where the phase is shifted by 1/3 so that two more coating films are formed in one pitch of the coating pattern 13a, and the number of times of shifting the phase is the number of times of repeated coating. It can be arbitrarily set according to. As a method of shifting the phase, it is possible to shift the starting point of the painting work from the origin 0 in FIG.

図１０に示すように位相を同じくして複数の重ね塗りを行った場合には、塗装膜の膜厚に厚い部分と薄い部分が生じてしまうが、前記図９に示したように位相をずらして塗布することにより、塗装膜の膜厚が平坦化されて一定膜厚の塗装膜を精度良く形成できるようになる。   As shown in FIG. 10, when a plurality of overcoats are performed with the same phase, a thick portion and a thin portion are generated in the coating film, but the phase is shifted as shown in FIG. By coating the film, the film thickness of the coating film is flattened and a coating film having a constant film thickness can be formed with high accuracy.

又、上記形態では筒体１の内表面１ａを全長に亘って一回の操作で塗装する場合について説明したが、筒体１の内表面１ａを筒体１の長手方向で２回に分けて塗布することもできる。即ち、図１１（ａ）に示すように、筒体１の内表面１ａに筒体１の長手方向中間位置まで塗装膜を形成して塗布を停止した後、筒体１を長手方向に反転し、図１１（ｂ）に示すように、残りの内表面１ａに前記停止位置である繋ぎ部１４まで塗装膜を形成する。尚、上記塗布を停止する位置では塗り残しが無く且つ不要な重ね塗りが生じないように、スプレーガン５の移動の停止と塗料の噴射の停止を制御する。   Moreover, although the said form demonstrated the case where the inner surface 1a of the cylinder 1 was coated by one operation over the full length, the inner surface 1a of the cylinder 1 was divided into 2 times in the longitudinal direction of the cylinder 1. It can also be applied. That is, as shown in FIG. 11 (a), after a coating film is formed on the inner surface 1a of the cylinder 1 up to the middle position in the longitudinal direction of the cylinder 1 and the application is stopped, the cylinder 1 is inverted in the longitudinal direction. As shown in FIG. 11B, a coating film is formed on the remaining inner surface 1a up to the connecting portion 14 which is the stop position. It should be noted that the stop of the movement of the spray gun 5 and the stop of the spraying of the paint are controlled so that there is no remaining coating and unnecessary overcoating does not occur at the position where the application is stopped.

更に、上記したように繋ぎ部１４を有する塗装膜上に更に塗装膜を形成する際には、図１２（ａ）に示すように、前回の繋ぎ部１４とは異なる位置まで塗装膜を形成して塗布を停止した後、筒体１を長手方向に反転し、図１２（ｂ）に示すように、残りの表面に今回の停止位置である繋ぎ部１４'まで塗装膜を形成し、今回の塗装膜の繋ぎ部１４'が前回の繋ぎ部１４と重ならないように塗布する。   Furthermore, when a coating film is further formed on the coating film having the connecting portion 14 as described above, the coating film is formed to a position different from the previous connecting portion 14 as shown in FIG. After the coating is stopped, the cylinder 1 is reversed in the longitudinal direction, and as shown in FIG. 12B, a coating film is formed on the remaining surface up to the connecting portion 14 ′ which is the current stop position. It is applied so that the joint portion 14 ′ of the coating film does not overlap the previous joint portion 14.

このように、筒体１の長手方向で２回に分けて塗布を行うと、特に内表面１ａを塗布する際における図１のアーム６の長さ及びスプレーガン５の移動ストロークを短縮できるので、塗装装置を小型化することができる。   As described above, when the coating is performed twice in the longitudinal direction of the cylindrical body 1, the length of the arm 6 in FIG. 1 and the moving stroke of the spray gun 5 can be shortened particularly when the inner surface 1a is applied. The painting apparatus can be downsized.

なお、本発明は上記形態にのみ限定されるものできなく、シャフト以外にも長手方向で断面形状が変化する種々の筒体の塗装に適用できること、その他、本発明の要旨を逸脱しない範囲内において種々変更を加え得ることは勿論である。   Note that the present invention is not limited to the above-described embodiment, and can be applied to the coating of various cylinders whose cross-sectional shape is changed in the longitudinal direction other than the shaft, and within the scope not departing from the gist of the present invention. Of course, various changes can be made.

コーン状に拡がった形状変化部を有する筒体の内表面に塗装膜を形成する場合の本発明の一例を示す側面図である。It is a side view which shows an example of this invention in the case of forming a coating film in the inner surface of the cylinder which has the shape change part expanded in cone shape. 図１のＩＩ−ＩＩ方向矢視図である。It is an II-II direction arrow line view of FIG. コーン状に拡がった形状変化部を有する筒体の外表面に塗装膜を形成する場合の本発明の一例を示す側面図である。It is a side view which shows an example of this invention in the case of forming a coating film in the outer surface of the cylinder which has the shape change part expanded in cone shape. スプレーガンと筒体の表面との相対距離と、スポット径の関係を示す側面図である。It is a side view which shows the relationship between the relative distance of a spray gun and the surface of a cylinder, and a spot diameter. 相対距離とスポット径と噴射圧の関係を示すグラフである。It is a graph which shows the relationship between a relative distance, a spot diameter, and an injection pressure. 本発明の溶接方法の原理作動を示す線図である。It is a diagram which shows the principle action | operation of the welding method of this invention. 本発明により筒体の内表面に形成された螺旋状の塗装膜の概略図である。It is the schematic of the helical coating film formed in the inner surface of a cylinder by this invention. スプレーガンの移動速度と筒体の回転速度を設定するための概念図である。It is a conceptual diagram for setting the moving speed of a spray gun and the rotational speed of a cylinder. 前回の塗布パターンに対して位相をずらして塗布した塗布パターンによる塗装膜の断面図である。It is sectional drawing of the coating film by the application pattern apply | coated with the phase shifted with respect to the last application pattern. 前回の塗布パターンに対して位相を同じくして塗布した塗布パターンによる塗装膜の断面図である。It is sectional drawing of the coating film by the application pattern apply | coated in the same phase with respect to the last application pattern. （ａ）は筒体の内表面の長手方向途中まで塗布した状態の概略図、（ｂ）は筒体を長手方向に反転し、内表面の残りを塗布して繋ぎ部を形成した状態の概略図である。(A) is a schematic diagram of a state in which the inner surface of the cylindrical body is applied halfway in the longitudinal direction, and (b) is an overview of a state in which the cylindrical body is inverted in the longitudinal direction and the remaining part of the inner surface is applied to form a joint portion. FIG. （ａ）は図１１で形成した塗装膜の上に更に前記繋ぎ部とは異なる位置まで塗布した状態の概略図、（ｂ）は筒体を長手方向に反転し、残りを塗布して前記とは異なる位置に繋ぎ部を形成した状態の概略図である。(A) is a schematic view of a state in which the coating film formed in FIG. 11 is further applied to a position different from the connecting portion, and (b) is a case where the cylindrical body is reversed in the longitudinal direction and the rest is applied. FIG. 3 is a schematic view of a state where connecting portions are formed at different positions. シャフトの一例を示す断面図である。It is sectional drawing which shows an example of a shaft.

符号の説明Explanation of symbols

１ 筒体
１ａ 内表面（表面）
１ｂ 外表面（表面）
３ 回転駆動手段
５ スプレーガン
１０ 圧力調節手段
１２ 移動手段
１３ 塗布パターン
１４ 繋ぎ部
１４' 繋ぎ部
Ａ 凹凸部
Ｌ 相対距離
Ｐ 噴射圧
Ｐ1 設定圧
Ｐ2 設定圧
ａ 重なり幅
ｄ スポット径
ω 筒体の回転速度
Ｖｓ スプレーガンの移動速度 1 cylinder 1a inner surface (surface)
1b Outer surface (surface)
DESCRIPTION OF SYMBOLS 3 Rotation drive means 5 Spray gun 10 Pressure adjustment means 12 Movement means 13 Application pattern 14 Connection part 14 'Connection part A Uneven part L Relative distance P Injection pressure P 1 setting pressure P 2 setting pressure a Overlap width d Spot diameter ω Cylindrical body Rotational speed Vs Spray gun moving speed

Claims (4)

筒体の内表面に一定膜厚の塗装膜を形成する筒体の塗装方法であって、
筒体の軸線を中心に回転駆動可能に支持する回転駆動手段と、移動手段により前記筒体の軸線と平行且つ筒体の内表面と間隔を隔てて移動し筒体の内表面に錐状に塗料を噴射するようにアームの先端に固定したスプレーガンと、該スプレーガンからの塗料の噴射量及び空気の噴射圧を調整して筒体内表面に塗布されるスポット径及び塗布量を調整するようにした圧力調節手段とを設け、
スプレーガンと筒体の長手方向内表面との相対距離を予め求めておき、
筒体内表面に塗布されるスポット径が前記相対距離に応じて一定に保持されるよう噴射圧を調整して筒体の回転とスプレーガンの移動とを行うことにより螺旋状の塗布パターンを形成し、同時に、前記相対距離の減少時にはスプレーガンの移動速度の増加と筒体の回転速度の増加を行い、又、前記相対距離の増加時にはスプレーガンの移動速度の減少と筒体の回転速度の減少を行うことにより、
筒体内表面に一定の塗布パターン幅で且つ一定のパターン間隔による一定膜厚の塗装膜を形成することを特徴とする筒体の塗装方法。 A cylinder coating method for forming a coating film having a certain thickness on the inner surface of a cylinder,
A rotation driving means for rotating drivable supported around the axis of the tubular body, the conical inner surface of the moving tubular body at a inner surface and spacing of parallel and cylindrical body the axis of the cylindrical body by the moving means adjusting the spray gun was fixed to the tip of the arm so as to inject the paint, the injection quantity and the spot diameter and the coating amount is applied to the adjustment to the cylindrical body surface injection pressure of the air of the paint from the spray gun And a pressure adjusting means as described above,
Obtain the relative distance between the spray gun and the longitudinal inner surface of the cylinder in advance,
Forming a spiral application pattern by the spot diameter which is applied to the cylindrical body surface to perform the movement of rotation and the spray gun of the tube body by adjusting the injection pressure to be kept constant in accordance with the relative distance At the same time, when the relative distance decreases, the spray gun moving speed increases and the cylinder rotation speed increases . When the relative distance increases, the spray gun movement speed decreases and the cylinder rotation speed increases. By making a decrease ,
Cylindrical body methods paint and forming a coating film of uniform thickness by and constant pattern interval at a constant application pattern width tubular body surface. 螺旋状に塗布した塗装膜上に更に塗装膜を形成する際は、前回の塗布パターンに対して位相をずらした塗布パターンで塗布する請求項１に記載の筒体の塗装方法。 The cylinder coating method according to claim 1 , wherein when a coating film is further formed on the spirally coated coating film, the coating film is applied with a coating pattern whose phase is shifted from the previous coating pattern. 筒体の内表面に筒体の長手方向中間位置まで塗装膜を形成して塗布を停止した後、筒体を長手方向に反転し、残りの内表面に前記停止位置である繋ぎ部まで塗装膜を形成する請求項１又は２に記載の筒体の塗装方法。 After forming the coating film on the inner surface of the cylinder to the middle position in the longitudinal direction of the cylinder and stopping the coating, the cylinder is reversed in the longitudinal direction, and the coating film is formed on the remaining inner surface up to the connecting portion at the stop position. The cylindrical body coating method according to claim 1 or 2 , wherein: 繋ぎ部を有して形成された塗装膜上に更に塗装膜を形成する際は、前回の繋ぎ部とは異なる位置まで塗装膜を形成して塗布を停止した後、筒体を長手方向に反転し、残りの内表面に今回の停止位置である繋ぎ部まで塗装膜を形成し、塗装膜の繋ぎ部が前回と今回とで重ならないようにした請求項３に記載の筒体の塗装方法。 When further coating film is formed on the coating film formed with the joint part, the coating film is formed to a position different from the previous joint part and the application is stopped, and then the cylinder is inverted in the longitudinal direction. 4. The method of painting a cylinder according to claim 3 , wherein a coating film is formed on the remaining inner surface up to the connecting portion at the current stop position so that the connecting portion of the coating film does not overlap with the previous time and this time.
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