JP2006130384A - Coating and drying method of aqueous paint and apparatus therefor - Google Patents

Coating and drying method of aqueous paint and apparatus therefor Download PDF

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JP2006130384A
JP2006130384A JP2004319901A JP2004319901A JP2006130384A JP 2006130384 A JP2006130384 A JP 2006130384A JP 2004319901 A JP2004319901 A JP 2004319901A JP 2004319901 A JP2004319901 A JP 2004319901A JP 2006130384 A JP2006130384 A JP 2006130384A
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drying
coating
coated
frequency induction
preheating
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Hidehiro Yamazaki
秀廣 山崎
Katsuhiko Kubota
勝彦 窪田
Toshiaki Kiuchi
利明 木内
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Asama Giken Co Ltd
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Asama Giken Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a coating and drying method of aqueous paint and apparatus therefor capable of shortening required time from coating to drying. <P>SOLUTION: A disc roller 1 is carried to a preheating high frequency induction heating coil 4 by a roller conveyer 2, and is locally preheated to 70-100°C by the preheating high frequency induction heating coil 4. The surface to be coated of the preheated disc roller 1 is coated by a coating robot 5 in the downstream. The coated disc roller 1 is carried to a drying and heating high frequency induction heating coil 7 through a setting process for curing, and heated there for drying the coated film. The disc roller 1 with the coating film formed thereon is recovered as a product 15. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、塗装対象物に水性塗料を塗布し、加熱装置を用いて強制的に乾燥させる水性塗料の塗布乾燥方法及び装置に関する。   The present invention relates to a method and an apparatus for applying and drying a water-based paint by applying a water-based paint to an object to be coated and forcibly drying it using a heating device.

塗装方法又は塗装装置に関する従来技術として、例えば特開2003−340361号公報、特開2002−126625号公報、特開2002−33324号公報、特開2001−96215号公報等が挙げられる。   Examples of conventional techniques relating to a coating method or a coating apparatus include JP-A No. 2003-340361, JP-A No. 2002-126625, JP-A No. 2002-33324, JP-A No. 2001-96215, and the like.

特開2003−340361号公報(特許文献1)には、乾燥時間の短縮、膨れ、ワキ等の欠陥の発生を防止することを目的とし、塗料工程、常温放置セッティング工程、プレヒート工程(35〜60℃、3〜5分)及び加熱乾燥工程(80〜120℃)を有する塗膜乾燥方法が開示されている。   Japanese Patent Application Laid-Open No. 2003-340361 (Patent Document 1) discloses a coating process, a room temperature standing setting process, a preheating process (35 to 60) for the purpose of shortening the drying time, preventing the occurrence of defects such as blistering and flaming. C., 3-5 minutes) and a coating drying method having a heat drying step (80-120.degree. C.) is disclosed.

また、特開2002−126625号公報(特許文献2)には、黄変することなく、優れた外観を有する塗膜形成方法を提供することを目的とし、鋼板に特定のカチオン塗料及び中塗り塗料を塗布し、特定条件で焼き付け処理した後、この塗装鋼板上に、水性中塗り塗料を塗布し、プレヒート又は焼付工程を経た後、水性ベース塗料を塗布し、その後、プレヒート工程を経て得られた塗装表面に、クリヤ塗料を塗布し、焼付(180℃、60分)を行う塗膜形成方法が開示されている。   JP 2002-126625 A (Patent Document 2) aims to provide a method of forming a coating film having an excellent appearance without yellowing, and a specific cationic paint and intermediate coating paint on a steel sheet. After coating and baking under specific conditions, a water-based intermediate coating was applied on the coated steel sheet, followed by a preheating or baking process, followed by a water-based base coating, and then obtained through a preheating process. A coating film forming method is disclosed in which a clear paint is applied to a painted surface and baking (180 ° C., 60 minutes) is performed.

更に、特開2002−33324号公報(特許文献3)には、水性分散塗料における割れのない、平滑性に優れた塗膜形成方法を提供することを目的として、特定方法で製造した水性分散塗料の塗布工程、常温における水分蒸発工程、塗料樹脂粒子の形成工程及び塗料樹脂粒子の溶融、融着工程(100〜160℃)を有する塗膜形成方法が開示されている。   Furthermore, JP 2002-33324 A (Patent Document 3) discloses an aqueous dispersion paint produced by a specific method for the purpose of providing a coating film forming method having no cracks in the aqueous dispersion paint and excellent in smoothness. A coating film forming method having a coating step, a water evaporation step at room temperature, a coating resin particle forming step, and a coating resin particle melting and fusing step (100 to 160 ° C.) is disclosed.

また、特開2001−96215号公報(特許文献4)には、たれ、たるみ、ワキ等の欠陥を生じない水性塗料の塗装方法を提供することを目的として、水性塗料の塗布工程、加熱乾燥工程(45〜60℃)及び乾燥空気(温度30℃、湿度30%)吹付け工程とを有する塗装方法が開示されている。   In addition, JP 2001-96215 A (Patent Document 4) discloses an aqueous paint application process and a heat drying process for the purpose of providing a coating method of an aqueous paint that does not cause defects such as sagging, sagging, and armpits. (45-60 degreeC) and the coating method which has a dry air (temperature 30 degreeC, humidity 30%) spraying process are disclosed.

特開2003−340361号公報JP 2003-340361 A 特開2002−126625号公報JP 2002-126625 A 特開2002−33324号公報JP 2002-33324 A 特開2001−96215号公報JP 2001-96215 A

しかしながら、上記従来技術は、いずれも塗装対象物全体の温度を管理して塗装、養生又は乾燥を行うものであり、塗装から乾燥までの所要時間を短縮することができないという問題点がある。   However, all of the above prior arts perform painting, curing or drying by controlling the temperature of the entire object to be painted, and there is a problem that the time required from painting to drying cannot be shortened.

本発明はかかる問題点に鑑み、塗装から乾燥までの所要時間を短縮することができる水性塗料の塗布乾燥方法及び装置を提供することを目的とする。   The present invention has been made in view of such problems, and an object thereof is to provide a method and an apparatus for applying and drying a water-based paint capable of shortening the time required from painting to drying.

本願第1発明に係る水性塗料の塗布乾燥方法は、塗装対象物を高周波誘導加熱して少なくとも表面を70乃至100℃の予熱温度まで昇温させる予熱工程と、予熱後の塗装対象物の被塗装面に水性塗料を塗布する塗布工程と、塗装対象物を前記予熱温度に保持する保持工程と、前記塗装対象物を所定の乾燥温度まで昇温させて塗装膜を乾燥させる乾燥工程と、を有することを特徴とする。   The method of applying and drying a water-based paint according to the first invention of the present application includes a preheating step of heating a coating object by high frequency induction heating to raise at least the surface to a preheating temperature of 70 to 100 ° C., and coating of the coating object after preheating An application step of applying a water-based paint to the surface; a holding step of holding the coating object at the preheating temperature; and a drying step of heating the coating object to a predetermined drying temperature to dry the coating film. It is characterized by that.

また、この場合に、前記乾燥工程においては前記塗装対象物を高周波誘導加熱することが好ましい。   In this case, it is preferable that the object to be coated be subjected to high frequency induction heating in the drying step.

更に、この場合において、前記塗装対象物は前記水性塗料の塗布により、20℃以上の温度降下を生じない熱容量を有するものであることが好ましい。   Furthermore, in this case, it is preferable that the object to be coated has a heat capacity that does not cause a temperature drop of 20 ° C. or more due to the application of the water-based paint.

本願第2発明に係る水性塗料の塗布乾燥装置は、塗装対象物を搬送するコンベアと、前記塗装対象物を高周波誘導加熱して少なくとも表面を70乃至100℃の予熱温度まで昇温させる予熱用高周波誘導加熱器と、予熱後の被塗装面に水性塗料を塗布する塗装用ロボットと、前記塗装対象物を所定の乾燥温度まで昇温させて塗装膜を乾燥させる乾燥用高周波誘導加熱器と、を有することを特徴とする。   A water-based coating application drying apparatus according to the second invention of the present application is a preheating high-frequency device that heats at least the surface to a preheating temperature of 70 to 100 ° C. by high-frequency induction heating of the coating object and a conveyor that conveys the object to be coated. An induction heater, a coating robot for applying a water-based paint to the surface to be coated after preheating, and a high-frequency induction heater for drying that dries the coating film by raising the temperature of the object to be coated to a predetermined drying temperature. It is characterized by having.

本願第1発明に係る水性塗料の塗布乾燥方法によれば、塗装対象物の被塗装面を高周波誘導加熱するようにしたので、塗装対象物の加熱時間又は塗装膜の乾燥時間を著しく短縮して水性塗料の塗布から乾燥までの所要時間を短縮することができる。   According to the application and drying method of the water-based paint according to the first invention of the present application, since the surface to be coated is subjected to high-frequency induction heating, the heating time of the coating object or the drying time of the coating film is remarkably shortened. The time required from application of the water-based paint to drying can be shortened.

本願の請求項2に係る水性塗料の塗布乾燥方法によれば、乾燥工程において前記塗装対象物を高周波誘導加熱するので、昇温時間を短縮して効率よく塗装膜を乾燥させることができる。   According to the method for applying and drying a water-based paint according to claim 2 of the present application, since the object to be coated is subjected to high frequency induction heating in the drying step, it is possible to efficiently dry the coating film by shortening the temperature raising time.

本願の請求項3に係る水性塗料の塗布乾燥方法によれば、前記塗装対象物は前記水性塗料の塗布により、20℃以上の温度降下を生じない熱容量を有するので、予熱及び乾燥温度の温度管理が容易となる。   According to the method for applying and drying a water-based paint according to claim 3 of the present application, since the object to be coated has a heat capacity that does not cause a temperature drop of 20 ° C. or more due to the application of the water-based paint, temperature control of preheating and drying temperature. Becomes easy.

本願第2発明に係る水性塗料の塗布乾燥装置によれば、水性塗料に最適条件の予熱・乾燥加熱を段階的に行うことによって乾燥時間の短縮を図り、塗装から乾燥に至る全処理時間を短縮することができる。   According to the coating and drying apparatus for water-based paints according to the second invention of the present application, the drying time is shortened by stepwise preheating and drying heating under the optimum conditions for the water-based paint, and the total processing time from coating to drying is shortened. can do.

以下、本発明の実施の形態について添付の図面を参照して詳細に説明する。図1乃至図3は本発明の実施形態に係る水性塗料の塗布乾燥装置を示す説明図であって、図1は平面図、図2は図1の乾燥用加熱器までを示す側面図、図3は図1の乾燥用加熱器よりも後流側を示す側面である。   Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 to 3 are explanatory views showing a water-based coating application drying apparatus according to an embodiment of the present invention, in which FIG. 1 is a plan view, FIG. 2 is a side view showing the drying heater of FIG. Reference numeral 3 denotes a side surface that indicates the downstream side of the drying heater of FIG.

図1において、この塗布乾燥装置には塗装対象物1としての例えば自動車のディスクロータを搬送するローラコンベア2が塗装対象物1の搬入端から搬出端にわたって設けられている。ローラコンベア2の塗装対象物の搬入端と搬出端とは例えば隣接しており、ローラコンベア2は塗装対象物の搬入端から搬出端に至る中間点で「U」字状に湾曲している。   In FIG. 1, this coating / drying apparatus is provided with a roller conveyor 2 that conveys, for example, a disk rotor of an automobile as a coating object 1 from the carry-in end to the carry-out end of the paint object 1. For example, the carry-in end and the carry-out end of the painting object of the roller conveyor 2 are adjacent to each other, and the roller conveyor 2 is curved in a “U” shape at an intermediate point from the carry-in end to the carry-out end of the painting object.

ローラコンベア2の前記「U」字状に湾曲するまでの間の上方には、塗装対象物1の搬入端から塗装対象物1の搬送方向に沿って順次予熱用高周波誘導加熱コイル4、水性塗料用塗装ロボット5及び乾燥用高周波誘導加熱コイル7が配置されている。予熱用高周波誘導加熱コイル4は高周波誘導加熱機本体3に接続されており、乾燥用高周波誘導加熱コイル7は乾燥用高周波誘導加熱機本体6に接続されている。   Above the roller conveyor 2 until it is curved in the “U” shape, a preheating high-frequency induction heating coil 4 and a water-based paint are sequentially provided from the carry-in end of the painting object 1 along the conveying direction of the painting object 1. A coating robot 5 for drying and a high-frequency induction heating coil 7 for drying are arranged. The preheating high-frequency induction heating coil 4 is connected to the high-frequency induction heating body 3, and the drying high-frequency induction heating coil 7 is connected to the drying high-frequency induction heating body 6.

水性塗料の塗装ロボット5と乾燥用高周波誘導加熱コイル7に接続された高周波誘導加熱機本体6との間には、予熱用高周波誘導加熱コイル4によって予熱された後、塗装ロボット5によって水性塗料が塗布された塗装対象物1を予熱温度のまま保持するための時間を確保する所定の間隙が設けられている。従って、ローラコンベア2がこの間隙内を移動する間が予熱温度保持工程となる。   The water-based paint is preheated by the preheating high-frequency induction heating coil 4 between the water-based paint painting robot 5 and the high-frequency induction heating body 6 connected to the drying high-frequency induction heating coil 7, and then the water-based paint is applied by the painting robot 5. A predetermined gap is provided to secure a time for holding the applied object 1 to be applied at the preheating temperature. Accordingly, the preheating temperature maintaining process is performed while the roller conveyor 2 moves in the gap.

ローラコンベア2には、例えば部分的にローラの中央部分が切除された間隙を有するローラ2aが配置されている。例えば間隙のない通常のローラ2bを2本配置し、その後流に間隙を有するローラ2aを3本を配置し、以下、2本の間隙のないローラ2bと3本の間隙のあるローラ2aが交互に配置されている。   On the roller conveyor 2, for example, a roller 2 a having a gap in which a central portion of the roller is partially cut is disposed. For example, two normal rollers 2b without a gap are arranged, and three rollers 2a having a gap in the downstream are arranged, and thereafter, two rollers 2b without a gap and three rollers 2a with a gap are alternately arranged. Is arranged.

ローラコンベア2の下方には、ローラコンベア2によって搬送される塗装対象物1を上方に押し上げ、加熱器内に挿入したり、塗装ロボットの塗装ノズルの噴射領域に搬入させるシリンダー12が、各加熱器及び塗装ロボットに対向するように配置されている。シリンダー12はローラコンベア2の間隙のあるローラ2aの前記間隙内を上昇して塗装対象物1を各加熱器4、7内又は塗装ロボット5の塗装ノズルの噴射領域内に押し上げる。   Below the roller conveyor 2, a cylinder 12 that pushes the coating object 1 conveyed by the roller conveyor 2 upward and inserts it into the heater or carries it into the spraying area of the painting nozzle of the painting robot is provided for each heater. And it arrange | positions so as to oppose the painting robot. The cylinder 12 ascends in the gap of the roller 2 a having a gap of the roller conveyor 2 and pushes the coating object 1 into each of the heaters 4 and 7 or the spraying area of the painting nozzle of the painting robot 5.

各シリンダー12の塗装対象物1の搬送方向下流側には、塗装対象物1を一時的に停止させるストッパ16が設けられており、このストッパ16は、加熱器4若しくは7又は塗装ロボット5に対応する位置に塗装対象物を停止させる。   A stopper 16 for temporarily stopping the coating object 1 is provided on the downstream side of each cylinder 12 in the conveying direction of the coating object 1, and this stopper 16 corresponds to the heater 4 or 7 or the coating robot 5. Stop the object to be painted at the position to be applied.

ローラコンベア2は乾燥用高周波誘導加熱コイル7が配置された部分の後流で「U」字状に湾曲しており、この湾曲部分の後流部分は、冷却領域及び防錆領域となっている。冷却領域のローラコンベア2の下方には複数の冷却ファン8が配置されている。   The roller conveyor 2 is curved in a “U” shape at the wake of the portion where the drying high-frequency induction heating coil 7 is disposed, and the wake of the curved portion is a cooling region and a rust prevention region. . A plurality of cooling fans 8 are arranged below the roller conveyor 2 in the cooling region.

冷却ファン8が配置された部分の後流には防錆槽9が設けられており、ローラコンベア2は、例えば防錆槽8の入口部分で下側に移動方向を変更し、ローラコンベア上の塗装された塗装対象物(以下、製品15という)が防錆槽8内の50℃の防錆液に浸漬するまで下降し、その後、水平に移動方向を変え、防錆槽9出口部分で更に移動方向を上側に変え、これによってコンベア上の製品15を防錆槽9から搬出し、その後、ほぼ水平に移動する。   The rust prevention tank 9 is provided in the downstream of the part where the cooling fan 8 is arranged, and the roller conveyor 2 changes the moving direction downward, for example, at the entrance part of the rust prevention tank 8, The coated object to be painted (hereinafter referred to as product 15) descends until it is immersed in a 50 ° C. rust preventive liquid in the rust preventive tank 8, and then the direction of movement is changed horizontally. The moving direction is changed to the upper side, whereby the product 15 on the conveyor is carried out from the anticorrosion tank 9 and then moved substantially horizontally.

防錆槽9の出口部分には、ローラコンベア2の上下にローラコンベア2を挟むように、ブローノズル10が配置されており、このブローノズル10によって製品に付着した余剰の防錆剤が吹き飛ばされる。ローラコンベア2のブローノズル10が設けられた部分の後流は製品15の搬出端となり、この搬出端は塗装対象物1の搬入端と隣接している。   A blow nozzle 10 is disposed at the outlet of the rust prevention tank 9 so as to sandwich the roller conveyor 2 above and below the roller conveyor 2, and excess rust preventive agent attached to the product is blown off by the blow nozzle 10. . The wake of the portion of the roller conveyor 2 where the blow nozzle 10 is provided becomes the carry-out end of the product 15, and this carry-out end is adjacent to the carry-in end of the coating object 1.

図2において、ローラコンベア2の塗装対象物1の搬入端のローラコンベア2の上方には、塗装対象物1をローラコンベア2上に載置する搬入装置11が設けられており、塗装対象物1としての例えば自動車のディスクロータは搬入装置11によってローラコンベア2上に搬入、載置される。   In FIG. 2, a carry-in device 11 for placing the painting object 1 on the roller conveyor 2 is provided above the roller conveyor 2 at the carry-in end of the painting object 1 of the roller conveyor 2. For example, a disk rotor of an automobile is loaded and placed on the roller conveyor 2 by the loading device 11.

予熱用高周波誘導加熱コイル3とローラコンベア2との間には所定の隙間が設けられており、予熱用高周波誘導加熱コイル3とローラコンベア2を挟んで対向するローラコンベア2の下方にはシリンダー12が配置されている。また、予熱用高周波誘導加熱コイル3のディスクロータ1の搬送方向後流側端部に対向するローラコンベア2の下方には塗装対象物であるディスクロータ1の位置決め用のストッパ16が設けられている。   A predetermined gap is provided between the preheating high-frequency induction heating coil 3 and the roller conveyor 2, and a cylinder 12 is disposed below the roller conveyor 2 facing the preheating high-frequency induction heating coil 3 and the roller conveyor 2. Is arranged. In addition, a stopper 16 for positioning the disk rotor 1 that is the object to be coated is provided below the roller conveyor 2 facing the upstream end of the preheating high-frequency induction heating coil 3 in the conveying direction of the disk rotor 1. .

ローラコンベア2上に搬入され、予熱用高周波誘導加熱コイル3の位置まで搬送されたディスクロータ1はストッパ16によってその搬送が停止され、ローラコンベア2の下方に設けられ間隙のあるローラ2aの前記間隙を上昇するシリンダー12によって上方に持ち上げられる。持ち上げられた塗装対象物1はその被塗装面が予熱用高周波誘導加熱コイル3内に挿入され、被塗装面が予熱される。   The disk rotor 1 carried onto the roller conveyor 2 and conveyed to the position of the preheating high-frequency induction heating coil 3 is stopped by a stopper 16, and the gap between the rollers 2a provided below the roller conveyor 2 and having a gap. Is lifted upward by a cylinder 12 that rises. The painted object 1 that has been lifted is inserted into the preheating high-frequency induction heating coil 3 so that the painted surface is preheated.

予熱用高周波誘導加熱コイル3の後流のローラコンベア2上には塗装ロボット5が配置されており、この塗装ロボット5とローラコンベア2との間にも所定の隙間が設けられている。   A painting robot 5 is disposed on the roller conveyor 2 downstream of the preheating high-frequency induction heating coil 3, and a predetermined gap is also provided between the painting robot 5 and the roller conveyor 2.

塗装ロボット5とローラコンベア2を挟んで対向するローラコンベア2の下方にはシリンダー12が配置されている。また、塗装ロボット5のディスクロータ1搬送方向後流側端部に対向するローラコンベア2の下方には塗装対象物であるディスクロータ1を停止させるための位置決め用のストッパ16が設けられている。   A cylinder 12 is disposed below the roller conveyor 2 facing the painting robot 5 with the roller conveyor 2 interposed therebetween. A positioning stopper 16 is provided below the roller conveyor 2 facing the downstream end of the coating robot 5 in the conveying direction of the disk rotor 1 to stop the disk rotor 1 that is the object to be coated.

予熱用高周波誘導加熱コイル3で塗装面が予熱されたディスクロータ1は塗装ロボット5の下方まで搬送され、ストッパ16によって停止される。塗装ロボット5の下方で停止したディスクロータ1はローラコンベア2の下方に設けられ間隙を有するローラ2aの前記間隙部分を通過して上昇するシリンダー12によって上方に持ち上げられ、予熱用高周波誘導加熱コイル3で予熱された塗装面に塗装ロボット5によって水性塗料が塗布される。   The disk rotor 1 whose coating surface has been preheated by the preheating high-frequency induction heating coil 3 is conveyed to below the coating robot 5 and stopped by a stopper 16. The disk rotor 1 stopped below the painting robot 5 is lifted upward by a cylinder 12 which is provided below the roller conveyor 2 and rises through the gap portion of the roller 2a having a gap, and is used for the preheating high frequency induction heating coil 3. A water-based paint is applied to the painted surface preheated by the painting robot 5.

塗装ロボット5の後流のローラコンベア2上には、その後流の乾燥用高周波誘導加熱コイル7との間に所定の間隔が設けられている。この間隔は塗装面が塗装されたディスクロータ1を予熱温度のまま保持し、養生(乾燥)するためのものである。この予熱温度保持のための間隔のディスクロータ1の搬送方向後流側のローラコンベア2の下方にもディスクロータ1の搬送を停止するためのストッパ16が設けられている。   On the roller conveyor 2 downstream of the painting robot 5, a predetermined interval is provided between the high-frequency induction heating coil 7 for drying downstream. This interval is for keeping the disk rotor 1 coated with the painted surface at the preheating temperature and curing (drying) it. A stopper 16 for stopping the conveyance of the disk rotor 1 is also provided below the roller conveyor 2 on the downstream side in the conveyance direction of the disk rotor 1 at an interval for maintaining the preheating temperature.

塗装ロボット5の後流には上述した養生(乾燥)のための間隔を隔てて乾燥用高周波誘導加熱コイル7が配置されており、この乾燥用高周波誘導加熱コイル7とローラコンベア2を挟んで対向するローラコンベア2の下方にはシリンダー12が配置されている。また、乾燥用高周波誘導加熱コイル7のディスクロータ1搬送方向後流側端部に対向するローラコンベア2の下方にはディスクロータ1を停止させるための位置決め用のストッパ16が設けられている。   A high-frequency induction heating coil 7 for drying is arranged behind the coating robot 5 with an interval for curing (drying) described above, and the high-frequency induction heating coil 7 for drying is opposed to the roller conveyor 2 with the roller conveyor 2 interposed therebetween. A cylinder 12 is disposed below the roller conveyor 2 to be operated. Further, a positioning stopper 16 for stopping the disk rotor 1 is provided below the roller conveyor 2 facing the end of the drying high-frequency induction heating coil 7 on the downstream side in the conveying direction of the disk rotor 1.

図3は、塗布乾燥装置の乾燥用高周波誘電加熱器7の後流部分を示す側面図であるが、乾燥用高周波誘電加熱器7の後流のローラコンベア2の下方には乾燥工程後の製品を冷却する冷却ファン8が複数設けられている。   FIG. 3 is a side view showing the downstream portion of the high-frequency dielectric heater 7 for drying of the coating and drying apparatus. The product after the drying process is provided below the roller conveyor 2 downstream of the high-frequency dielectric heater 7 for drying. A plurality of cooling fans 8 are provided for cooling the air.

冷却ファン8の後流には防錆槽9が設けられており、冷却後の製品にはここで防錆剤が塗布される。防錆剤の塗布は例えば製品を防錆槽9内の防錆剤中に浸漬するどぶ付けにより行う。防錆槽9出口部分にはローラコンベア2の上下にブローノズル10が配置されており、製品15に付着した余剰の防錆剤はブローノズル10によって除去される。余剰の防錆剤が吹き飛ばされた製品15はローラコンベア2の搬出端から次の工程に搬出される。   A rust prevention tank 9 is provided downstream of the cooling fan 8, and a rust inhibitor is applied to the cooled product here. The application of the rust preventive agent is performed by, for example, dripping by immersing the product in the rust preventive agent in the rust preventive tank 9. Blow nozzles 10 are disposed above and below the roller conveyor 2 at the exit portion of the rust prevention tank 9, and excess rust preventive agent adhering to the product 15 is removed by the blow nozzle 10. The product 15 from which excess rust preventive agent has been blown off is carried out from the carry-out end of the roller conveyor 2 to the next step.

冷却工程における冷却ファン8からの送風はフード13によって吸引され、ブローノズル10からのブローエアーとして利用される。また防錆槽8の上部空間部がフード14によって吸引され、同様にブローノズル10からのブローエアーとして利用される。   Air blown from the cooling fan 8 in the cooling step is sucked by the hood 13 and used as blow air from the blow nozzle 10. Further, the upper space portion of the rust prevention tank 8 is sucked by the hood 14 and similarly used as blow air from the blow nozzle 10.

次に、上述の如く構成された本発明の水性塗料の塗布乾燥装置の動作について説明する。本実施形態においてローラコンベア2は、例えば間欠移動するものである。先ず、ローラコンベア2の搬入端側に搬入装置11によって塗装対象物としてのディスクロータ1が搬入され、ローラコンベア2上に載置される。   Next, the operation of the water-based paint coating and drying apparatus of the present invention configured as described above will be described. In this embodiment, the roller conveyor 2 moves intermittently, for example. First, the disk rotor 1 as an object to be coated is loaded onto the roller conveyor 2 by the loading device 11 and placed on the roller conveyor 2.

ディスクロータ1はローラコンベア2上を搬送方向(図2中右方向)に搬送され、高周波誘導加熱機本体3に接続された予熱用高周波誘導加熱コイル4の下方に到達した時、ストッパ16がローラコンベア2のローラ相互間の隙間を上昇し、ディスクロータ1の搬送を停止する。   When the disk rotor 1 is conveyed on the roller conveyor 2 in the conveying direction (right direction in FIG. 2) and reaches below the preheating high-frequency induction heating coil 4 connected to the high-frequency induction heater body 3, the stopper 16 is turned into a roller. The clearance between the rollers of the conveyor 2 is raised, and the conveyance of the disk rotor 1 is stopped.

図4はローラコンベア2によって搬送されるディスクロータ1と予熱用高周波誘導加熱コイル4との位置関係を示す模式図であり、図4(a)はディスクロータ1が加熱コイル4の下に到達して停止した状態を示す。   FIG. 4 is a schematic diagram showing the positional relationship between the disk rotor 1 conveyed by the roller conveyor 2 and the preheating high-frequency induction heating coil 4. FIG. 4A shows that the disk rotor 1 reaches below the heating coil 4. Indicates a stopped state.

搬送が停止したディスクロータ1は、間隙を有するローラ2aの前記間隙を通過して上昇するシリンダー12によって持ち上げられ、被塗装面が予熱用高周波誘導加熱コイル4のコイル本体内に挿入される。図4(b)は、ディスクロータ1の被塗装面が予熱用高周波誘導加熱コイル4のコイル本体内に挿入された状態を示す説明図である。予熱用高周波誘導加熱コイル4のコイル本体内に挿入されたディスクロータ1の被塗装面は所定の予熱温度、例えば70乃至100℃に予熱される。   The disk rotor 1 whose conveyance has been stopped is lifted by a cylinder 12 that rises through the gap of the roller 2a having a gap, and the surface to be coated is inserted into the coil body of the high-frequency induction heating coil 4 for preheating. FIG. 4B is an explanatory view showing a state in which the surface to be coated of the disk rotor 1 is inserted into the coil body of the preheating high-frequency induction heating coil 4. The coated surface of the disk rotor 1 inserted into the coil body of the preheating high-frequency induction heating coil 4 is preheated to a predetermined preheating temperature, for example, 70 to 100 ° C.

このとき、加熱コイル4は高周波誘導加熱コイルであるので、所定温度までの昇温時間は短く、10乃至20秒で予熱が完了する。なお、塗装対象物であるディスクロータ1は水性塗料の塗布により20℃以上の温度降下を生じない程度の熱容量を有するものであり、極端な温度低下を生じることはない。   At this time, since the heating coil 4 is a high frequency induction heating coil, the heating time to a predetermined temperature is short, and the preheating is completed in 10 to 20 seconds. The disk rotor 1 that is the object to be coated has a heat capacity that does not cause a temperature drop of 20 ° C. or more due to the application of the water-based paint, and does not cause an extreme temperature drop.

予熱されたディスクロータ1はシリンダー12の下降によってローラコンベア2上に載置され、ローラコンベア2の稼働によって水性塗料の塗装ロボット5の下方に搬送され、対応するストッパ16で前記と同様にしてその搬送が停止され、塗装ロボット5のローラコンベア2を挟んで対応する下方に設けられたシリンダー12によって持ち上げられ、塗装ロボット5の塗装ノズル5aの噴霧領域内に挿入される。   The preheated disc rotor 1 is placed on the roller conveyor 2 by the lowering of the cylinder 12, and is transported below the water paint paint robot 5 by the operation of the roller conveyor 2, and the corresponding stopper 16 is used in the same manner as described above. The conveyance is stopped, lifted by a cylinder 12 provided below corresponding to the roller conveyor 2 of the painting robot 5, and inserted into the spray region of the painting nozzle 5 a of the painting robot 5.

塗装ロボット5の塗装ノズルの噴霧領域内に挿入された予熱後のディスクロータ1の被塗装面に対して塗装ロボット5の塗装ノズルから水性塗料が吹き付けられ、塗装が完了する。塗装所要時間は例えば30秒程度である。   Water-based paint is sprayed from the painting nozzle of the painting robot 5 onto the surface to be coated of the pre-heated disc rotor 1 inserted in the spraying area of the painting nozzle of the painting robot 5, and the painting is completed. The time required for painting is, for example, about 30 seconds.

塗装が終了したディスクロータ1はシリンダー12の下降によってローラコンベア2上に載置され、ローラコンベア2の稼働によって後流の予熱温度保持のための間隙部に至り、ここで所定時間、例えば1分間予熱温度に保持され、この間に養生(塗膜が乾燥)する(後述する図5(a)参照)。   The coated disk rotor 1 is placed on the roller conveyor 2 by the lowering of the cylinder 12, and the roller conveyor 2 is operated to reach a gap for maintaining the preheating temperature of the downstream flow. Here, for a predetermined time, for example, 1 minute The preheating temperature is maintained, and curing (the coating film is dried) during this time (see FIG. 5A described later).

乾燥後のディスクロータ1はローラコンベア2の稼働によって後流の乾燥用高周波誘導加熱コイル7の下方に搬送され、対応するストッパ16でその搬送が停止され、乾燥用高周波誘導加熱コイル7とローラコンベア2を挟んで対応する下方に設けられたシリンダー12によって持ち上げられ、塗装面が乾燥用高周波誘導加熱コイル7のコイル本体内に挿入され、例えば140℃に加熱されて塗装膜が乾燥する。140℃までの昇温時間は例えば1分であり、乾燥時間は例えば30秒である。この場合に、予熱したディスクロータ1に塗装したので、70乃至100℃の予熱温度を有するディスクロータ1を乾燥すればよいので、乾燥工程も短くなる。   The dried disk rotor 1 is conveyed under the downstream high-frequency induction heating coil 7 by the operation of the roller conveyor 2, and the conveyance is stopped by the corresponding stopper 16, and the high-frequency induction heating coil 7 for drying and the roller conveyor are stopped. 2 is lifted by a corresponding cylinder 12 provided below, and the coating surface is inserted into the coil body of the high-frequency induction heating coil 7 for drying, and heated to, for example, 140 ° C. to dry the coating film. The temperature raising time up to 140 ° C. is, for example, 1 minute, and the drying time is, for example, 30 seconds. In this case, since the preheated disk rotor 1 is coated, the disk rotor 1 having a preheating temperature of 70 to 100 ° C. may be dried, and the drying process is shortened.

塗装膜の乾燥が終了した製品15としてのディスクロータ1は、後流の冷却領域に搬送され、ローラコンベア2の下方に配置された冷却ファン8によって冷却される。   The disk rotor 1 as the product 15 that has finished drying the coating film is conveyed to a downstream cooling region and cooled by a cooling fan 8 disposed below the roller conveyor 2.

冷却後のディスクロータ1は、防錆槽8の入口部分で下側に移動方向を変更するローラコンベア2によって防錆槽9内の例えば50℃の防錆液に浸漬され、その後、防錆槽9出口部分で上側に移動方向を変えるローラコンベア2によって防錆槽9から搬出され、これによって防錆剤が塗布される。   After cooling, the disk rotor 1 is immersed in a rust prevention liquid of, for example, 50 ° C. in the rust prevention tank 9 by the roller conveyor 2 that changes the moving direction downward at the entrance of the rust prevention tank 8, and then the rust prevention tank. The roller conveyor 2 that changes the moving direction upward at the 9 exit portion is carried out of the rust prevention tank 9, thereby applying a rust inhibitor.

防錆槽9の出口部分には、ローラコンベア2の上下にローラコンベア2を挟むように、ブローノズル10が配置されており、このブローノズル10によって製品としての塗装後のディスクロータ1に付着した余剰の防錆剤が吹き飛ばされる。塗装後のディスクロータ1はローラコンベア2の搬出端から次工程に搬出される。   A blow nozzle 10 is disposed at the exit of the rust prevention tank 9 so as to sandwich the roller conveyor 2 above and below the roller conveyor 2, and the blow nozzle 10 adheres to the coated disc rotor 1 as a product. Excess rust inhibitor is blown away. The coated disc rotor 1 is unloaded from the unloading end of the roller conveyor 2 to the next process.

本実施形態によれば、予熱器及び乾燥用加熱器として高周波誘導加熱コイルを用いたので、塗装対象物を迅速に予熱及び乾燥加熱することができるので、塗装対象物の全体を加熱していた従来技術に比べて塗装及び乾燥に要する時間を大幅に短縮することができる。   According to this embodiment, since the high-frequency induction heating coil is used as the preheater and the drying heater, the coating object can be quickly preheated and dried and heated, so that the entire coating object is heated. Compared with the prior art, the time required for painting and drying can be greatly reduced.

図5は、本実施形態と従来技術との塗装及び乾燥時間を比較したものであり、図5(a)が本実施形態を示し、図5(b)が従来技術を示す。図5において、本実施形態においては、乾燥工程である本加熱までに要する時間は、例えば5分であり、従来技術の30分程度に比べて著しく短縮できたことが分かる。   FIG. 5 compares the coating and drying times of the present embodiment and the prior art, FIG. 5 (a) shows the present embodiment, and FIG. 5 (b) shows the prior art. In FIG. 5, in this embodiment, it can be seen that the time required for the main heating, which is a drying process, is, for example, 5 minutes, which can be remarkably shortened compared to about 30 minutes of the prior art.

本実施形態によれば、予熱温度を70乃至100℃としたので、塗膜の乾燥が促進できる上、塗料を沸騰させることがないので、塗装面の膨れ及びワキを防止することができる。   According to the present embodiment, since the preheating temperature is set to 70 to 100 ° C., drying of the coating film can be promoted, and the paint is not boiled, so that the paint surface can be prevented from being swollen and cracked.

本実施形態によれば、水性塗料の塗装、乾燥時間を著しく短縮することができるので、塗装、乾燥工程を機械加工ラインとアッシーラインとの間に設ける等、製造ラインバリエーションが広がる。   According to this embodiment, the coating and drying time of the water-based paint can be remarkably shortened, so that the production line variations are widened such as providing a coating and drying process between the machining line and the assembly line.

本実施形態において、加熱温度の昇温速度は塗装の仕上がり状態に影響を与えないので、特に規定しない。また、養生(乾燥)のための予熱温度保持時間は水性塗料の乾燥状況によって適宜設定される。   In the present embodiment, the heating rate of the heating temperature is not particularly specified because it does not affect the finished state of the coating. Further, the preheating temperature holding time for curing (drying) is appropriately set depending on the drying state of the water-based paint.

上記実施形態において塗装対象物としてディスクロータを使用した場合について説明したが、本発明の水性塗料の塗布乾燥方法に適用される塗装対象物は特に限定されるものではない。   Although the case where a disk rotor is used as the coating object in the above embodiment has been described, the coating object applied to the water-based coating application drying method of the present invention is not particularly limited.

本発明は、膨れ、ワキ等の不都合を生じることなく水性塗料の塗装乾燥時間を大幅に短縮することができるものであり、水性塗料の塗膜形成の分野で特に有用である。   INDUSTRIAL APPLICABILITY The present invention can greatly reduce the coating and drying time of a water-based paint without causing inconveniences such as blistering and peeling, and is particularly useful in the field of coating a water-based paint.

本発明に係る水性塗料の塗布乾燥装置の平面図である。It is a top view of the application | coating drying apparatus of the water-based paint which concerns on this invention. 本発明に係る水性塗料の塗布乾燥装置の部分側面図である。It is a partial side view of the application | coating drying apparatus of the water-based paint which concerns on this invention. 本発明に係る水性塗料の塗布乾燥装置の部分側面図である。It is a partial side view of the application | coating drying apparatus of the water-based paint which concerns on this invention. 誘導加熱コイルと塗装対象物との位置関係を示す図である。It is a figure which shows the positional relationship of an induction heating coil and a coating target object. 本発明の効果を従来技術と比較して示す図である。It is a figure which shows the effect of this invention compared with a prior art.

符号の説明Explanation of symbols

1:塗装対象物(ディスクロータ)
2:ローラコンベア
2a:間隙のあるローラ
2b:間隙のないローラ
3:予熱用高周波誘導加熱機本体
4:予熱用高周波誘導加熱コイル
5:塗装ロボット
5a:塗装ノズル
6:乾燥用高周波誘導加熱機本体
7:乾燥用高周波誘導加熱コイル
8:冷却ファン
9:防錆槽
10:ブローノズル
11:搬入装置
12:シリンダー
13:フード
14:フード
15:製品
16:ストッパ
1: Painting object (disc rotor)
2: Roller conveyor 2a: Roller with gap 2b: Roller without gap 3: High-frequency induction heating machine body for preheating 4: High-frequency induction heating coil for preheating 5: Coating robot 5a: Coating nozzle 6: High-frequency induction heating body for drying 7: High frequency induction heating coil for drying 8: Cooling fan 9: Rust prevention tank 10: Blow nozzle 11: Loading device 12: Cylinder 13: Hood 14: Hood 15: Product 16: Stopper

Claims (4)

塗装対象物を高周波誘導加熱して少なくとも表面を70乃至100℃の予熱温度まで昇温させる予熱工程と、予熱後の塗装対象物の被塗装面に水性塗料を塗布する塗布工程と、塗装対象物を前記予熱温度に保持する保持工程と、前記塗装対象物を所定の乾燥温度まで昇温させて塗装膜を乾燥させる乾燥工程と、を有することを特徴とする水性塗料の塗布乾燥方法。   A preheating step of heating the object to be coated by high frequency induction to raise at least the surface to a preheating temperature of 70 to 100 ° C., an application step of applying a water-based paint to the surface of the object to be coated after preheating, and the object to be coated A method for applying and drying a water-based paint, comprising: a holding step for keeping the temperature at the preheating temperature; and a drying step for heating the coating object to a predetermined drying temperature to dry the coating film. 前記乾燥工程においては前記塗装対象物を高周波誘導加熱することを特徴とする請求項1に記載の水性塗料の塗布乾燥方法。   2. The method of applying and drying a water-based paint according to claim 1, wherein in the drying step, the object to be coated is subjected to high frequency induction heating. 前記塗装対象物は前記水性塗料の塗布により20℃以上の温度降下を生じない熱容量を有するものであることを特徴とする請求項1又は2に記載の水性塗料の塗布乾燥方法。   The method for applying and drying an aqueous paint according to claim 1 or 2, wherein the object to be coated has a heat capacity that does not cause a temperature drop of 20 ° C or more due to the application of the aqueous paint. 塗装対象物を搬送するコンベアと、前記塗装対象物を高周波誘導加熱して少なくとも表面を70乃至100℃の予熱温度まで昇温させる予熱用高周波誘導加熱器と、予熱後の被塗装面に水性塗料を塗布する塗装用ロボットと、前記塗装対象物を所定の乾燥温度まで昇温させて塗装膜を乾燥させる乾燥用高周波誘導加熱器と、を有することを特徴とする水性塗料の塗布乾燥装置。   A conveyor that conveys the object to be coated, a high-frequency induction heater for preheating that heats the object to be coated by high-frequency induction to raise the temperature to at least a preheating temperature of 70 to 100 ° C., and a water-based paint on the surface to be coated after preheating An aqueous paint coating and drying apparatus comprising: a coating robot for coating the coating object; and a high-frequency induction heater for drying that raises the coating object to a predetermined drying temperature to dry the coating film.
JP2004319901A 2004-11-02 2004-11-02 Coating and drying method of aqueous paint and apparatus therefor Pending JP2006130384A (en)

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