JP2000005645A - Rotary atomizing electrostatic coating method and machine - Google Patents
Rotary atomizing electrostatic coating method and machineInfo
- Publication number
- JP2000005645A JP2000005645A JP10176991A JP17699198A JP2000005645A JP 2000005645 A JP2000005645 A JP 2000005645A JP 10176991 A JP10176991 A JP 10176991A JP 17699198 A JP17699198 A JP 17699198A JP 2000005645 A JP2000005645 A JP 2000005645A
- Authority
- JP
- Japan
- Prior art keywords
- atomizing head
- air
- center
- atomizing
- head
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
- B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
- B05B3/10—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces
- B05B3/1064—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces the liquid or other fluent material to be sprayed being axially supplied to the rotating member through a hollow rotating shaft
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
- B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
- B05B5/04—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces
- B05B5/0403—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces characterised by the rotating member
- B05B5/0407—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces characterised by the rotating member with a spraying edge, e.g. like a cup or a bell
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
- B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
- B05B3/10—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces
- B05B3/1092—Means for supplying shaping gas
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
- B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
- B05B5/04—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces
- B05B5/0426—Means for supplying shaping gas
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Electrostatic Spraying Apparatus (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、回転霧化静電塗装
方法および回転霧化静電塗装機に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary atomizing electrostatic coating method and a rotary atomizing electrostatic coating machine.
【０００２】[0002]
【従来の技術】従来、回転霧化静電塗機を用いた静電塗
装方法では、塗装時に、霧化頭の先端外周面側に向け
て、霧化頭から飛散する塗粒の塗装パターンを成形する
ためのシェーピングエアが吹き出される。シェーピング
エアが捩じり方向に吹き出されると、塗装パターン幅が
拡がることが知られている。2. Description of the Related Art Conventionally, in an electrostatic coating method using a rotary atomizing electrostatic coating machine, at the time of coating, a coating pattern of coating particles scattered from the atomizing head toward the outer peripheral side of the tip of the atomizing head is formed. Shaping air for molding is blown out. It is known that when the shaping air is blown out in the twisting direction, the width of the coating pattern is increased.
【０００３】[0003]
【発明が解決しようとする課題】捩じり方向に吹き出さ
れたシェーピングエアの風速を、霧化頭（ベル）近傍と
被塗物面付近の２箇所で、アネモマスターを用いて測定
した。測定により得られた風速分布を、図８に示す。図
８に示すように、風速分布はいずれの箇所においても不
均一で、とくに、霧化頭の中心部に当たる部分には負圧
の領域があることがわかった。風速分布が不均一である
と、霧化頭から飛散した塗粒の飛行スピードが異なり、
被塗物面に塗粒が塗着した時点での塗粒の溶剤の渇き具
合および被塗物面への塗粒の衝突スピードが異なる。そ
のため、塗装面の明度などがばらつく。また、塗膜厚さ
も不均一になることから、安定した仕上がり品質を有す
る塗膜が形成されない。したがって、シェーピングエア
の風速分布は均一であることが望まれる。本発明の目的
は、良好な塗膜品質を安定して得ることができる回転霧
化静電塗装方法および回転霧化静電塗装機を提供するこ
とにある。The velocity of the shaping air blown in the torsional direction was measured at two locations near the atomizing head (bell) and near the surface of the workpiece using an anemomaster. FIG. 8 shows the wind speed distribution obtained by the measurement. As shown in FIG. 8, it was found that the wind speed distribution was non-uniform at any point, and in particular, there was a negative pressure area at the part corresponding to the center of the atomization head. If the wind speed distribution is non-uniform, the flying speed of the coating particles scattered from the atomization head will differ,
The degree of dryness of the solvent of the coating particles at the time when the coating particles are applied to the surface of the substrate and the speed of collision of the particles with the surface of the substrate differ. Therefore, the brightness of the painted surface varies. Further, since the thickness of the coating film becomes non-uniform, a coating film having stable finish quality is not formed. Therefore, it is desired that the wind speed distribution of the shaping air be uniform. An object of the present invention is to provide a rotary atomizing electrostatic coating method and a rotary atomizing electrostatic coating machine capable of stably obtaining good coating film quality.
【０００４】[0004]
【課題を解決するための手段】上記目的を達成する本発
明は、つぎの通りである。 （１） 塗装時に、回転軸芯まわりに回転する霧化頭の
後方から回転軸芯に対して捩じれ方向に霧化頭の外周面
側に向けてシェーピングエアを吹き出すと同時に、霧化
頭の中心部から霧化頭の中心部前方へ向けて中央エアを
吹き出すことを特徴とする、回転霧化静電塗装方法。 （２） 回転軸芯まわりに回転する中空の回転軸と、前
記回転軸と一体に回転可能とされた霧化頭と、該霧化頭
の後方に配置され、霧化頭の外周面側に向けて前記回転
軸芯に対して捩じれ方向にシェーピングエアを吹き出す
吹き出し口を備えたシェーピングエアキャップと、前記
霧化頭内に配置され、塗装時に霧化頭の中心部から霧化
頭の中心部前方へ向けて中央エアを吹き出す中央エア噴
出ノズルと、を備える回転霧化静電塗装機。The present invention to achieve the above object is as follows. (1) At the time of coating, the shaping air is blown from the back of the atomizing head rotating around the rotation axis to the outer peripheral surface side of the atomization head in the twisting direction with respect to the rotation axis, and at the same time, the center of the atomization head A rotary atomizing electrostatic coating method, characterized in that a central air is blown from a part toward a front of a central part of an atomizing head. (2) a hollow rotary shaft that rotates around the rotary shaft center, an atomizing head that is rotatable integrally with the rotary shaft, and a rear side of the atomizing head that is disposed on the outer peripheral surface side of the atomizing head. A shaping air cap having an outlet for blowing shaping air in a twisting direction with respect to the rotation axis, and a shaping air cap disposed in the atomizing head, and a central portion of the atomizing head from a center of the atomizing head during painting. A rotary atomizing electrostatic coating machine, comprising: a central air ejection nozzle for blowing central air forward.
【０００５】上記（１）の回転霧化静電塗装方法では、
塗装時に回転軸芯まわりに回転する霧化頭の後方から回
転軸に対して捩じれ方向に霧化頭の外周面側に向けてシ
ェーピングエアを吹き出すと同時に、霧化頭の中心部か
ら霧化頭の中心部前方へ向けて中央エアを吹き出すこと
により、被塗物面付近でのエアの流速をほぼ均一にする
ことができるので、良好な塗膜品質が安定して得られ
る。上記（２）の回転霧化静電塗装機では、霧化頭の後
方に配置され、霧化頭の外周面側に向けて回転軸に対し
て捩じれ方向にシェーピングエアを吹き出す吹き出し口
を備えたシェーピングエアキャップと、霧化頭の中心部
前方へ向けて中央エアを吹き出す中央エア噴出ノズルと
を備えているので、塗装時に、シェーピングエアと中央
エアを吹き出すことができ、それにより、被塗物面付近
でのエアの流速をほぼ均一にすることができるので、良
好な塗膜品質が安定して得られる。In the rotary atomizing electrostatic coating method (1),
At the same time as blowing the shaping air from the back of the atomizing head that rotates around the axis of the rotating shaft to the outer circumferential surface side of the atomizing head in the twisting direction with respect to the rotating shaft, the atomizing head from the center of the atomizing head By blowing out the central air toward the front of the center portion, the flow velocity of the air near the surface to be coated can be made substantially uniform, so that good coating quality can be stably obtained. The rotary atomizing electrostatic coating machine according to the above (2) is provided with an outlet which is disposed behind the atomizing head and blows out shaping air in a twisting direction with respect to the rotating shaft toward the outer peripheral surface side of the atomizing head. Since it has a shaping air cap and a central air jet nozzle that blows out the central air toward the center of the atomizing head, the shaping air and the central air can be blown out at the time of painting, and thereby, Since the air flow rate near the surface can be made substantially uniform, good coating quality can be stably obtained.
【０００６】[0006]
【発明の実施の形態】図１〜図３は本発明実施例の回転
霧化静電塗装機を示し、図４〜図６は本発明実施例の回
転霧化静電塗装機を用いて回転霧化静電塗装を行った場
合のシェーピングエアが吹き出す方向を示し、図７は本
発明実施例の回転霧化静電塗装機を用いて回転霧化静電
塗装を行った場合のエアの風速分布を示す。1 to 3 show a rotary atomizing electrostatic coating machine according to an embodiment of the present invention, and FIGS. 4 to 6 show a rotary atomizing electrostatic coating machine according to the embodiment of the present invention. FIG. 7 shows the direction in which the shaping air blows out when the atomization electrostatic coating is performed. FIG. 7 shows the wind speed of the air when the rotary atomization electrostatic coating is performed using the rotary atomization electrostatic coating machine according to the embodiment of the present invention. Shows the distribution.
【０００７】まず、本発明実施例の回転霧化静電塗装機
について、説明する。本発明実施例の回転霧化静電塗装
機は、回転軸芯まわりに回転する中空の回転軸１０と、
回転軸１０と一体に回転可能にされた霧化頭２０と、霧
化頭２０の後方に配置され霧化頭２０の外周面側の外周
端付近に向けて回転軸芯に対して捩じれ方向にシェーピ
ングエアを吹き出す吹き出し口３１を備えたシェーピン
グエアキャップ３０と、霧化頭内に配置され、塗装時に
霧化頭２０の中心部から霧化頭２０の中心部前方へ向け
て中央エアを吹き出す中央エア噴出ノズル４０と、ケー
シング５０と、を備える。First, a rotary atomizing electrostatic coating machine according to an embodiment of the present invention will be described. The rotary atomizing electrostatic coating machine according to the embodiment of the present invention includes a hollow rotating shaft 10 that rotates around a rotating shaft center,
An atomizing head 20 rotatable integrally with the rotating shaft 10, and a torsion direction with respect to the rotating shaft core toward the vicinity of the outer peripheral end of the atomizing head 20 which is disposed behind the atomizing head 20. A shaping air cap 30 having a blowing port 31 for blowing out shaping air, and a center arranged in the atomizing head and for blowing central air from the center of the atomizing head 20 toward the front of the center of the atomizing head 20 during coating. An air ejection nozzle 40 and a casing 50 are provided.
【０００８】回転軸１０は、端部の外周に、霧化頭と結
合するための、雄ネジが切られている。回転軸１０はエ
アモータ６０によって回転駆動される。The rotating shaft 10 is provided with an external thread on the outer periphery of the end for connecting with the atomizing head. The rotating shaft 10 is driven to rotate by an air motor 60.
【０００９】霧化頭２０は、ベル型であり、先端に向か
って拡開している。後端部内面には雌ネジが切られ、回
転軸１０の先端部に一体的に結合されている。霧化頭２
０の前部には円板状のハブ２１が形成されている。ハブ
２１は、後面中央が後方に向かって突出している。ハブ
２１は、外周縁部に塗料を通す塗料孔２１ａを複数備
え、中央部に中央エア噴出ノズル４０を通す孔２１ｂを
１つ備える。The atomizing head 20 is bell-shaped and widens toward the tip. A female screw is cut on the inner surface of the rear end portion, and is integrally connected to the front end portion of the rotating shaft 10. Atomization head 2
A disk-shaped hub 21 is formed at the front of the zero. The center of the rear surface of the hub 21 projects rearward. The hub 21 is provided with a plurality of paint holes 21a for passing paint on the outer peripheral edge, and one hole 21b for passing the central air ejection nozzle 40 in the center.
【００１０】シェーピングエアキャップ３０は、ケーシ
ング５０の先端に取り付けられている。シェーピングエ
ア吹き出し口３１はシェーピングエアの吹き出し向きＳ
が、図４に示すように、霧化頭２０の接線を含む面内で
回転軸芯に対して所定角度β（たとえば、３０°）捩じ
れ、かつその捩じれ方向を図５に示すように、霧化頭２
０の回転方向Ｐと反対の方向となる形状にされている。
そのため、吹き出し口３１から吹き出されたシェーピン
グエアは、図６に示すように、回転軸芯に対して捩じれ
方向に向かう。The shaping air cap 30 is attached to the tip of the casing 50. The shaping air outlet 31 has a blowing direction S of the shaping air.
However, as shown in FIG. 4, in the plane including the tangent line of the atomizing head 20, it is twisted at a predetermined angle β (for example, 30 °) with respect to the rotation axis, and as shown in FIG. Incarnation 2
It is formed in a direction opposite to the rotation direction P of 0.
Therefore, as shown in FIG. 6, the shaping air blown out from the blowout port 31 is directed in a twisting direction with respect to the rotation axis.
【００１１】中央エア噴出ノズル４０は、霧化頭２０の
中心部に配置されている。また、霧化頭２０のハブ２１
の中心に設けられた孔２１ｂに挿通され、先端は霧化頭
２０のハブ２１の前面より前に突出している。また、先
端が拡開していることが好ましい。この場合、図２に示
すように、中央エア噴出ノズル４０は前部４１が後部４
２に対して脱着可能な分割型とされる。前部ノズル４１
はその後端部外面４１ａに雄ネジが切られ、内面４１ｂ
に６角穴が設けられている。また後部ノズル４２は前端
部内面４２ａに雄ネジが切られている。６角穴に６角レ
ンチを挿通し、回動することにより前部ノズル４１は後
部ノズル４２に対して容易に脱着できる。The center air ejection nozzle 40 is arranged at the center of the atomizing head 20. The hub 21 of the atomizing head 20
Is inserted through a hole 21b provided at the center of the atomizing head, and the tip protrudes forward of the front surface of the hub 21 of the atomizing head 20. Further, it is preferable that the tip is widened. In this case, as shown in FIG.
It is a split type that can be attached to and detached from 2. Front nozzle 41
Is externally threaded on the outer surface 41a at the rear end, and the inner surface 41b
Is provided with a hexagonal hole. The rear nozzle 42 has a front end inner surface 42a with an external thread. The front nozzle 41 can be easily attached to and detached from the rear nozzle 42 by inserting a hexagon wrench through the hexagonal hole and rotating.
【００１２】回転軸１０内には少なくとも１本の塗料ノ
ズル７０が挿通されている。塗料ノズル７０は、塗装時
に霧化頭２０の後面に塗料を供給する。塗料ノズル７０
は先端部が、霧化頭２０のハブ２１後面に沿って径方向
外側に、曲げられていることが好ましい。塗料ノズル７
０は回転軸１０内に複数本配置されてもよく、たとえ
ば、中心に１本とそのまわりに複数本配置することがで
きる。また、複数本の塗料フィードノズル７０は１本の
洗浄剤ノズル８０に挿通され、先端は洗浄剤ノズル８０
から突出している。なお、回転軸１０の中心に中央エア
噴出ノズル４０が配置され、そのまわりに複数本の塗料
ノズル７０が配置されてもよい。中央エア噴出ノズル４
０は、必要に応じて周囲の塗料ノズル７０より内径が大
きくされるなど、塗料ノズル７０とは異なる種類のもの
とされる。At least one paint nozzle 70 is inserted through the rotating shaft 10. The paint nozzle 70 supplies paint to the rear surface of the atomizing head 20 during painting. Paint nozzle 70
It is preferable that the tip is bent radially outward along the rear surface of the hub 21 of the atomizing head 20. Paint nozzle 7
A plurality of 0s may be arranged in the rotating shaft 10, and for example, one can be arranged at the center and a plurality of 0s can be arranged around the center. Further, the plurality of paint feed nozzles 70 are inserted through one cleaning agent nozzle 80, and the tip thereof is the cleaning agent nozzle 80.
Projecting from. The central air ejection nozzle 40 may be arranged at the center of the rotating shaft 10, and a plurality of paint nozzles 70 may be arranged around the center air ejection nozzle 40. Central air jet nozzle 4
0 is a different type from the paint nozzle 70, for example, the inner diameter is made larger than the surrounding paint nozzle 70 as necessary.
【００１３】ハウジング５０の中もしくは外には高電圧
発生器が備えられている。高電圧発生器は高電圧を発生
させ、回転軸１０を介して霧化頭２０に供給する。霧化
頭２０に供給された高電圧は、霧化頭２０の外周端から
飛散する塗粒に帯電される。A high voltage generator is provided inside or outside the housing 50. The high voltage generator generates a high voltage and supplies it to the atomizing head 20 via the rotating shaft 10. The high voltage supplied to the atomizing head 20 is charged to the coating particles scattered from the outer peripheral end of the atomizing head 20.
【００１４】つぎに、本発明実施例の回転霧化静電塗装
機の作用を説明する。なお、この回転霧化静電塗装機の
作用は、本発明実施例の回転霧化静電塗装方法でもあ
る。塗装時、１本の塗料ノズル７０から、塗料が霧化頭
２０のハブ２１後面に吐出される。塗料ノズル７０の先
端がハブ後面に沿って径方向外側に曲げられている場合
には、塗料のはね返りが少なくてよい。また、ハブ中央
部の孔２１ｂへ塗料が入り、微粒化不良となるのを防止
する。霧化頭２０は回転軸芯まわりに回転していること
から、ハブ後面に吐出された塗料は遠心力によって、ハ
ブ外周縁部に向かって流れ、塗料孔２１ａを通り抜け、
霧化頭外周端に向かって霧化頭内面を流れる。Next, the operation of the rotary atomizing electrostatic coating machine according to the embodiment of the present invention will be described. The operation of the rotary atomizing electrostatic coating machine is also the rotary atomizing electrostatic coating method of the embodiment of the present invention. At the time of painting, the paint is discharged from one paint nozzle 70 to the rear surface of the hub 21 of the atomizing head 20. When the tip of the paint nozzle 70 is bent radially outward along the rear surface of the hub, the paint splash may be small. In addition, paint is prevented from entering the hole 21b at the center of the hub and causing poor atomization. Since the atomizing head 20 is rotating around the rotation axis, the paint discharged to the rear surface of the hub flows toward the outer peripheral edge of the hub by centrifugal force and passes through the paint hole 21a.
It flows on the inner surface of the atomizing head toward the outer edge of the atomizing head.
【００１５】塗装開始前から、霧化頭の後方に配置され
たシェーピングエアキャップ３０のシェーピングエア吹
き出し口３１からは、霧化頭２０の外周面側の外周端付
近に向けて回転軸芯Ｏに対して捩じれ方向にシェーピン
グエアが吹き出されている。また、中央エア噴出ノズル
４０からは、中央エアが霧化頭２０の中心部前方に向け
て吹き出されている。Before the start of the coating, the shaping air outlet 31 of the shaping air cap 30 disposed behind the atomizing head is connected to the rotating shaft O toward the vicinity of the outer peripheral end of the outer peripheral surface side of the atomizing head 20. On the other hand, shaping air is blown in the twisting direction. From the center air ejection nozzle 40, the center air is blown toward the front of the center of the atomization head 20.
【００１６】シェーピングエアと中央エアの２種類のエ
アが吹き出された場合の、霧化頭（ベル）近傍における
エアの風速（２種類のエアが吹き出されることによって
得られるエアの風速）と、被塗物面付近におけるエアの
風速（２種類のエアが吹き出されることによって得られ
るエアの風速）を、アネモマスターを用いて測定した。
図７にはその風速分布が示されている。なお、本発明実
施例の霧化頭の外周端の内径は約７ｃｍであり、塗装の
パターン幅は約４０〜５０ｃｍであった。図７に示すよ
うに、本発明実施例のシェーピングエアと中央エアの２
種類のエアが同時に吹き出されている場合は、霧化頭２
０の近傍では、負圧領域（マイナス方向のエア流れ領
域）がなくなっている。また、被塗物面付近では、エア
の風速はほぼ均一となっている。中央エアの流量は任意
であり、シェーピングエアの流量、中央エア噴出ノズル
の形状などによって適宜決められる。流量を決める方法
としては、たとえば、シェーピングエアが予め必要量出
されている状態で、徐々に中央エアを出し、風速分布が
均一となった時点での中央エアの流量を適量とする方法
がある。中央エアの流量はシェーピングエアの流量より
は少ない。When two types of air, ie, shaping air and central air, are blown out, the air speed near the atomization head (bell) (the air speed obtained by blowing out the two types of air); The air velocity near the surface of the object to be coated (air velocity obtained by blowing two types of air) was measured using an Anemomaster.
FIG. 7 shows the wind speed distribution. In addition, the inner diameter of the outer peripheral end of the atomization head of the example of the present invention was about 7 cm, and the pattern width of the coating was about 40 to 50 cm. As shown in FIG. 7, two of the shaping air and the center air of the embodiment of the present invention are shown.
If two types of air are being blown out at the same time,
In the vicinity of 0, the negative pressure region (the air flow region in the negative direction) disappears. In the vicinity of the surface of the object to be coated, the air velocity is substantially uniform. The flow rate of the center air is arbitrary, and is appropriately determined by the flow rate of the shaping air, the shape of the center air ejection nozzle, and the like. As a method of determining the flow rate, for example, there is a method in which the central air is gradually discharged in a state where a necessary amount of the shaping air is supplied in advance, and the flow rate of the central air when the wind speed distribution becomes uniform is set to an appropriate amount. . The flow rate of the center air is smaller than the flow rate of the shaping air.
【００１７】中央エア噴出ノズル４０への中央エアの供
給流量が一定のとき、中央エア噴出ノズル４０のノズル
径が小さいほど、エア圧力が高くなり、線速が増し、周
囲のエアがまきこまれやすくなる。それに対し、図１、
図２に示すように、中央エア噴出ノズル４０の先端が拡
開していると、周囲のエアのまきこみが少なくなるの
で、エアの流速分布が均一になりやすい。When the supply flow rate of the central air to the central air ejection nozzle 40 is constant, the smaller the nozzle diameter of the central air ejection nozzle 40, the higher the air pressure, the linear velocity increases, and the surrounding air is easily swallowed. Become. In contrast, FIG.
As shown in FIG. 2, when the end of the central air ejection nozzle 40 is expanded, the amount of surrounding air is reduced, and the air flow velocity distribution is likely to be uniform.
【００１８】塗料は、霧化頭２０の外周端に達すると、
外周端から径方向外側に向かって、塗粒となって飛散す
る。霧化頭２０には回転軸１０を介して、高電圧発生器
によって高電圧が印加されていることから、塗粒は帯電
している。塗粒は、シェーピングエアの吹き出し口３１
から吹き出されたシェーピングエアと、中央エア噴出ノ
ズル４０から吹き出された中央エアの２種類のエアとに
よって、前方に吹かれる。２種類のエアは、被塗物面付
近では、図７に示すように均一な流速分布を描いている
ので、塗粒は、飛行スピードがほぼ同じ状態で、被塗物
面に塗着する。そのため、塗粒が被塗物面へ塗着した時
点での塗粒中の溶剤の渇き具合が同じで、また、被塗物
面への塗粒の衝突スピードもほぼ同じとなっている。こ
れにより、得られた塗装面の明度のばらつきなどが従来
のシェーピングエアのみが吹き出されていた場合に比べ
て少なくなる。また、塗膜厚さも一定となり、品質が良
好な塗膜が安定して得られる。When the paint reaches the outer peripheral end of the atomizing head 20,
The particles are scattered toward the outside in the radial direction from the outer peripheral end as coating particles. Since a high voltage is applied to the atomizing head 20 via the rotary shaft 10 by the high voltage generator, the coating particles are charged. Coating particles are blown out of shaping air 31
The air is blown forward by two types of air, namely, shaping air blown from the air and central air blown from the central air jet nozzle 40. Since the two types of air have a uniform flow velocity distribution near the surface of the workpiece as shown in FIG. 7, the coating particles are applied to the surface of the workpiece at substantially the same flight speed. Therefore, the degree of thirst of the solvent in the coating particles at the time when the coating particles are applied to the surface of the object to be coated is the same, and the collision speed of the particles to the surface of the object to be coated is almost the same. As a result, variations in the brightness of the obtained painted surface are reduced as compared with the case where only the conventional shaping air is blown out. In addition, the thickness of the coating film becomes constant, and a coating film of good quality can be stably obtained.
【００１９】[0019]
【発明の効果】請求項１の回転霧化静電塗装方法によれ
ば、塗装時に回転軸芯まわりに回転する霧化頭の後方か
ら回転軸に対して捩じれ方向に霧化頭の外周面側に向け
てシェーピングエアを吹き出すと同時に、霧化頭の中心
部から霧化頭の中心部前方に向けて中央エアを吹き出す
ことにより、被塗物面付近でのエアの流速をほぼ均一に
することができるので、良好な塗膜品質が安定して得ら
れる。請求項２の回転霧化静電塗装機によれば、霧化頭
の後方に配置され、霧化頭の外周面側に向けて回転軸に
対して捩じれ方向にシェーピングエアを吹き出す吹き出
し口を備えたシェーピングエアキャップと、霧化頭の中
心部前方へ向けて中央エアを吹き出す中央エア噴出ノズ
ルとを備えているので、塗装時に、シェーピングエアと
中央エアを吹き出し、被塗物面付近でのエアの流速をほ
ぼ均一にすることができ、それにより良好な塗膜品質が
安定して得られる。According to the rotary atomizing electrostatic coating method of the first aspect, the outer peripheral surface side of the atomizing head is twisted with respect to the rotating shaft from the back of the atomizing head rotating around the rotation axis at the time of coating. By blowing out the shaping air toward the center and simultaneously blowing out the center air from the center of the atomizing head toward the front of the center of the atomizing head, the air flow velocity near the surface of the workpiece is almost uniform Therefore, good coating quality can be stably obtained. According to the rotary atomizing electrostatic coating machine of the second aspect, an outlet is provided behind the atomizing head and blows out shaping air in a twisting direction with respect to the rotating shaft toward the outer peripheral surface side of the atomizing head. It has a shaping air cap and a central air jet nozzle that blows out the central air toward the front of the center of the atomization head. Can be made substantially uniform, so that good coating quality can be stably obtained.
【図１】本発明実施例の回転霧化静電塗装機の部分断面
図である。FIG. 1 is a partial sectional view of a rotary atomizing electrostatic coating machine according to an embodiment of the present invention.
【図２】本発明実施例の回転霧化静電塗装機の中央エア
噴出ノズルの断面図である。FIG. 2 is a sectional view of a central air ejection nozzle of the rotary atomizing electrostatic coating machine according to the embodiment of the present invention.
【図３】図２の中央エア噴出ノズルを正面から見た図で
ある。FIG. 3 is a front view of the central air ejection nozzle of FIG. 2;
【図４】本発明実施例の回転霧化静電塗装機のシェーピ
ングエアの吹き出す方向を示す図である。FIG. 4 is a view showing a blowing direction of shaping air of the rotary atomizing electrostatic coating machine according to the embodiment of the present invention.
【図５】本発明実施例の回転霧化静電塗装機のシェーピ
ングエアの吹き出す方向を示す図である。FIG. 5 is a view showing a blowing direction of shaping air of the rotary atomizing electrostatic coating machine according to the embodiment of the present invention.
【図６】本発明実施例の回転霧化静電塗装機のシェーピ
ングエアの吹き出す方向を示す図である。FIG. 6 is a view showing a blowing direction of shaping air of the rotary atomizing electrostatic coating machine according to the embodiment of the present invention.
【図７】本発明実施例の回転霧化静電塗装機を用いて塗
装を行った場合のエアの風速分布を示す図である。FIG. 7 is a view showing a wind speed distribution of air when coating is performed using the rotary atomizing electrostatic coating machine according to the embodiment of the present invention.
【図８】従来の回転霧化静電塗装機を用いて塗装を行っ
た場合のエアの風速分布を示す図である。FIG. 8 is a diagram showing a wind speed distribution of air when coating is performed using a conventional rotary atomizing electrostatic coating machine.
１０ 回転軸 ２０ 霧化頭 ３０ シェーピングエアキャップ ３１ 吹き出し口 ４０ 中央エア噴出ノズル DESCRIPTION OF SYMBOLS 10 Rotation axis 20 Atomization head 30 Shaping air cap 31 Outlet 40 Central air ejection nozzle
Claims (2)
化頭の後方から回転軸芯に対して捩じれ方向に霧化頭の
外周面側に向けてシェーピングエアを吹き出すと同時
に、霧化頭の中心部から霧化頭の中心部前方へ向けて中
央エアを吹き出すことを特徴とする、回転霧化静電塗装
方法。1. At the time of coating, at the same time as blowing out shaping air from the rear of the atomizing head rotating about the rotation axis toward the outer peripheral surface side of the atomization head in a twisting direction with respect to the rotation axis, the atomization head is simultaneously sprayed. A center air is blown out from the center of the spray head toward the center of the atomizing head.
と、 前記回転軸と一体に回転可能とされた霧化頭と、 該霧化頭の後方に配置され、霧化頭の外周面側に向けて
前記回転軸芯に対して捩じれ方向にシェーピングエアを
吹き出す吹き出し口を備えたシェーピングエアキャップ
と、 前記霧化頭内に配置され、塗装時に霧化頭の中心部から
霧化頭の中心部前方へ向けて中央エアを吹き出す中央エ
ア噴出ノズルと、を備える回転霧化静電塗装機。2. A hollow rotary shaft that rotates around a rotary shaft center, an atomizing head rotatable integrally with the rotary shaft, and an outer peripheral surface of the atomizing head that is disposed behind the atomizing head. A shaping air cap having an outlet for blowing shaping air in a twisting direction with respect to the rotating shaft core toward the side, disposed in the atomizing head, and the atomizing head from the center of the atomizing head during painting. A rotary atomizing electrostatic coating machine comprising: a central air ejection nozzle that blows central air toward a center forward.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10176991A JP2000005645A (en) | 1998-06-24 | 1998-06-24 | Rotary atomizing electrostatic coating method and machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10176991A JP2000005645A (en) | 1998-06-24 | 1998-06-24 | Rotary atomizing electrostatic coating method and machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000005645A true JP2000005645A (en) | 2000-01-11 |
Family
ID=16023282
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10176991A Pending JP2000005645A (en) | 1998-06-24 | 1998-06-24 | Rotary atomizing electrostatic coating method and machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000005645A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013071049A (en) * | 2011-09-28 | 2013-04-22 | Honda Motor Co Ltd | Coating apparatus and coating method using the same |
| WO2016167427A1 (en) * | 2015-04-17 | 2016-10-20 | 주식회사 에스엠뿌레 | Sprayer and spray-control apparatus |
-
1998
- 1998-06-24 JP JP10176991A patent/JP2000005645A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013071049A (en) * | 2011-09-28 | 2013-04-22 | Honda Motor Co Ltd | Coating apparatus and coating method using the same |
| WO2016167427A1 (en) * | 2015-04-17 | 2016-10-20 | 주식회사 에스엠뿌레 | Sprayer and spray-control apparatus |
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