JP2775333B2 - Electrodeposition method - Google Patents
Electrodeposition methodInfo
- Publication number
- JP2775333B2 JP2775333B2 JP2075933A JP7593390A JP2775333B2 JP 2775333 B2 JP2775333 B2 JP 2775333B2 JP 2075933 A JP2075933 A JP 2075933A JP 7593390 A JP7593390 A JP 7593390A JP 2775333 B2 JP2775333 B2 JP 2775333B2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- coating
- electrodeposition
- electrodeposition coating
- vehicle body
- 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.)
- Expired - Lifetime
Links
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、電着槽内に自動車車体を浸漬し該槽内の電
極と自動車車体との間に直流電圧を印加して塗膜を形成
する電着塗装方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention forms a coating film by immersing a car body in an electrodeposition tank and applying a DC voltage between an electrode in the tank and the car body. To an electrodeposition coating method.
（従来の技術） 従来は、自動車車体と電極との間に定電圧を印加して
電着塗装を行なうようにしている（特公昭58−33320号
公報）。(Prior Art) Conventionally, a constant voltage is applied between an automobile body and an electrode to perform electrodeposition coating (Japanese Patent Publication No. Sho 58-33320).
（発明が解決しようとする課題） 上記した従来の方法では、抵抗値が比較的小さい通電
当初に第８図で一点鎖線で示すように大きな電流が流
れ、塗料が急激に付着するため自動車車体の電極に近い
部分と遠い部分とでは電着膜厚のばらつきを生じ易く、
また車体本体とドアとの間等の隙間部分では第７図に示
す如く塗料がブリッジ状に付着する塗装欠陥を生じるこ
とがある。(Problems to be Solved by the Invention) In the above-mentioned conventional method, a large current flows as indicated by a dashed line in FIG. The electrodeposition film thickness tends to vary between the part near and far from the electrode,
Further, in a gap portion between the vehicle body and the door or the like, a coating defect may occur in which the coating material adheres in a bridge shape as shown in FIG.
本発明は、かかる問題点に鑑みてなされたものであ
り、その目的とするところは塗膜厚のばらつきや隙間部
分における塗装欠陥を阻止できるようにした電着塗装方
法を提供することにある。The present invention has been made in view of such a problem, and an object of the present invention is to provide an electrodeposition coating method capable of preventing a coating film from fluctuating in thickness and a coating defect in a gap portion.
（課題を解決するための手段） 上記目的を達成すべく、本発明では、電着槽内に自動
車車体を浸漬し該槽内の電極と自動車車体との間に直流
電圧を印加して塗膜を形成する電着塗装方法において、
自動車車体と電極との間に流れる電流値が設定値になる
ように印加電圧を制御しつつ電着塗装を行ない、印加電
圧が所定の値に達した後はこの電圧値のままで電着塗装
を行ない、且つ、これら電着塗装を自動車車体を車長方
向の軸線回りに回転しつつ行なうようにした。(Means for Solving the Problems) In order to achieve the above object, according to the present invention, an automobile body is immersed in an electrodeposition tank, and a DC voltage is applied between an electrode in the tank and the automobile body to form a coating film. In the electrodeposition coating method for forming
Electrodeposition coating is performed while controlling the applied voltage so that the current value flowing between the vehicle body and the electrode becomes a set value. After the applied voltage reaches a predetermined value, the electrodeposition coating is performed at this voltage value. And performing the electrodeposition coating while rotating the vehicle body around an axis in the vehicle length direction.
（作 用） 自動車車体と電極との間に流れる電流値が一定になる
ように印加電圧を制御して電着塗装を行なうため、通電
当初から塗料が徐々に付着するようになって、塗面の電
着膜厚のばらつきが減少され、また隙間部分における塗
装欠陥も阻止できる。(Operation) Since the electrodeposition is performed by controlling the applied voltage so that the current value flowing between the vehicle body and the electrode is constant, the paint gradually adheres from the beginning of energization. Of the electrodeposited film thickness is reduced, and coating defects in the gaps can be prevented.
電着膜が厚くなり抵抗値が大きくなると設定電流値を
維持するための印加電圧が塗膜破壊電圧値を超えてしま
うことがある。When the electrodeposition film becomes thick and the resistance value becomes large, the applied voltage for maintaining the set current value may exceed the coating film breakdown voltage value.
この場合、印加電圧が塗膜破壊電圧値を超えることが
無いように設定電流値を比較的低く設定するのでは、塗
装時間が長くかかり生産性が低下してしまうが、印加電
圧が所定の値に達した後はこの電圧値のままで電着塗装
を行なうことで、塗膜破壊を生じず塗装時間も短縮でき
る。In this case, if the set current value is set relatively low so that the applied voltage does not exceed the coating film breakdown voltage value, the coating time is long and productivity is reduced, but the applied voltage is a predetermined value. After reaching, the electrodeposition coating is performed with this voltage value kept, so that the coating film is not broken and the coating time can be shortened.
また、自動車車体は比較的大きいため、車体の側面と
ルーフとでは電着槽の側面に配置した電極までの距離が
大きく異なり塗膜厚のばらつきを生じ易いが、自動車車
体を車長方向の軸線回りに回転することで車体の側面や
ルーフの電極までの距離が経時的に均一化され、上記し
たように塗料が徐々に付着されることと相俟って均一な
厚さの電着塗装を得られる。In addition, since the car body is relatively large, the side of the car body and the roof greatly differ in the distance to the electrodes arranged on the side of the electrodeposition tank, and the coating thickness tends to vary. By rotating around, the distance to the side of the vehicle body and the electrode of the roof is made uniform over time, and as described above, the paint is gradually attached, and the electrodeposition coating of uniform thickness can get.
（実施例） 第１図は本発明電着塗装方法を実施するための電着塗
装装置の概略説明線図であり、（１）は電着槽（２）内
の左右両側及び底部に配置した電極、（３）は給電回
路、（４）は該給電回路（３）に介設したAC/DC変換器
を構成するサイリスタ、（５）は平滑回路を示し、該給
電回路（３）のプラス側は電極（１）とマイナス側は自
動車車体Ｗとに接続される。(Example) FIG. 1 is a schematic explanatory diagram of an electrodeposition coating apparatus for carrying out the electrodeposition coating method of the present invention, wherein (1) is disposed on both left and right sides and a bottom in an electrodeposition tank (2). Electrodes, (3) a power supply circuit, (4) a thyristor constituting an AC / DC converter interposed in the power supply circuit (3), (5) a smoothing circuit, and a plus of the power supply circuit (3). The negative side is connected to the electrode (1) and the negative side is connected to the vehicle body W.
（６）は電極（１）と自動車車体Ｗとの間の印加電圧
を制御する制御回路であり、該制御回路（６）はサイリ
スタ（４）に制御信号を出力するゲートドライブ回路
（７）と、給電回路（３）の電流を検出する電流検出器
（８）及びその電圧を検出する電圧検出器（９）と、電
流設定器（10）からの信号と該電流検出器（８）からの
信号との差を増幅する電流誤差増幅器（11）と、電圧リ
ミット設定器（12）からの信号と前記電圧検出器（９）
からの信号との差を増幅する電圧誤差増幅器（13）と、
該両増幅器（11）（13）からの出力信号を入力しレベル
の低い方の信号を選択して前記ゲートドライブ回路
（７）に操作信号を出力する比較選択回路（14）とから
成る。(6) is a control circuit for controlling an applied voltage between the electrode (1) and the vehicle body W. The control circuit (6) includes a gate drive circuit (7) for outputting a control signal to the thyristor (4). A current detector (8) for detecting the current of the power supply circuit (3), a voltage detector (9) for detecting the voltage thereof, a signal from the current setter (10), and a signal from the current detector (8). A current error amplifier (11) for amplifying a difference from a signal; a signal from a voltage limit setting device (12); and the voltage detector (9).
A voltage error amplifier (13) for amplifying the difference from the signal from
A comparison / selection circuit (14) for receiving output signals from the amplifiers (11) and (13), selecting a signal having a lower level, and outputting an operation signal to the gate drive circuit (7).
電流検出器（８）からは出力電流Io即ち電極（１）と
自動車車体Ｗとの間に流れる電流に比例した電流フィー
ドバック信号Ifが出力され、電圧検出器（９）からは出
力電圧Voに比例した電圧フィードバック信号Vfが出力さ
れ、電流設定器（10）の設定信号Irと電流フィードバッ
ク信号Ifとの差Eiが電流誤差増幅器（11）によって増幅
され、該増幅器（11）から電流操作信号Uiが出力され
る。The current detector (8) outputs an output current Io, that is, a current feedback signal If that is proportional to the current flowing between the electrode (1) and the vehicle body W. The voltage detector (9) outputs an output voltage V voltage feedback signal V f which is proportional to o is outputted, the difference E i between the set signal I r and the current feedback signal I f current setter (10) is amplified by a current error amplifier (11), the amplifier (11 ) current steering signal U i is output from.
一方、電圧リミット設定器（12）の設定信号Vrと電圧
フィードバック信号Vfとの差Evが電圧誤差増幅器（13）
によって増幅され、該増幅器（13）から電圧操作信号Uv
が出力される。各操作信号Ui,Uvは、比較選択回路（1
4）に入力され、レベルの低い方が選択されてゲートド
ライブ回路（７）に操作信号Ｕとして出力される。On the other hand, the difference E v between the set signal V r and the voltage feedback signal V f of the voltage limit setter (12) voltage error amplifier (13)
And the voltage operation signal U v from the amplifier (13).
Is output. Each of the operation signals U i and U v is supplied to a comparison selection circuit (1
4), the lower level is selected and output as an operation signal U to the gate drive circuit (7).
かくて、第３図示の特性図のように、通電開始直後
は、塗装物の抵抗ＲがVr/Irより小さいため、出力は設
定電流値に等しく制御され、Ir≒IfとなってUiは比較的
小さな値となる。このときの出力電圧はリミット設定値
に比べ小さく、Vr＞VfであるためUvは大きな値となり、
Uv＜UiとなってUiが操作量として選択され、以後出力電
流Ioが設定電流値になるように出力電圧が制御される。And thus, as in the characteristic diagram of the third illustrated, immediately after the start of energization, since the resistance R of the coated product is less than V r / I r, output is equal control the set current value, a I r ≒ I f U i is a relatively small value. The output voltage at this time is smaller than the limit setting value, and since Vr > Vf , Uv becomes a large value,
Becomes U v <U i is selected as U i is the manipulated variable, the output voltage as hereinafter output current I o is the set current value is controlled.
電着塗膜が厚くなって塗装物の抵抗Ｒが増大し出力電
圧が上昇してリミット設定値に近ずくとUvは減少し、や
がてUiに等しくなり、さらに抵抗Ｒが増すと、出力電圧
Voがリミット設定値に等しくなり、出力電流値は減少し
始める。このときIr＞IfとなってUiは急増し、Ui＞Uvと
なってUvが操作量として選択され、以後出力電圧Voがリ
ミット設定値に制御される。When the electrodeposition coating film becomes thicker and the resistance R of the painted object increases and the output voltage rises and approaches the limit set value, U v decreases, eventually becomes equal to U i , and when the resistance R further increases, the output increases. Voltage
V o is equal to the limit set value, the output current begins to decrease. U i is increased rapidly becomes this time I r> I f, U v becomes U i> U v is selected as the operation amount, hereinafter the output voltage V o is controlled to the limit set value.
本発明方法により自動車車体Ｗの電着塗装を行なっ
た。The electrodeposition coating of the vehicle body W was performed by the method of the present invention.
即ち、日本ペイント株式会社製のユニプライム500HMF
電着塗料を用い設定電流値を500A、リミット電圧値を30
0Vとし液温30℃で170秒間通電した。In other words, Uniprime 500HMF manufactured by Nippon Paint Co., Ltd.
Set current value is 500A, limit voltage value is 30 using electrodeposition paint
The voltage was set to 0 V, and electricity was supplied at a liquid temperature of 30 ° C. for 170 seconds.
そして、本発明方法により電着塗装を行なった自動車
車体と従来の方法即ち印加電圧280Vで180秒間通電した
ものについて、第４図でＡ〜Ｊで示す自動車車体各分の
塗膜厚を測定した。この場合、本発明方法と従来の方法
とでクーロン量が同一になるように通電時間を調整し
た。尚、Ｊは自動車車体Ｗのフロアフレームを示す。Then, with respect to the vehicle body subjected to electrodeposition coating according to the method of the present invention and a conventional method, that is, a vehicle body energized with an applied voltage of 280 V for 180 seconds, the coating thickness of each of the vehicle bodies indicated by A to J in FIG. 4 was measured. . In this case, the energization time was adjusted so that the coulomb amount was the same between the method of the present invention and the conventional method. J indicates a floor frame of the vehicle body W.
その結果、第２図示の如く自動車車体Ｗのドアとの隙
間部分に塗料がブリッジ状に付着する塗装欠陥を生じず
良好な塗膜を得られた。また、第５図示の如く、実線で
示す本発明方法によるものは２点鎖線で示す従来の方法
によるものに比べ自動車車体各部の塗膜厚のばらつきが
大幅に減少した。しかも、最厚に電着された自動車車体
の膜厚と最薄に電着された自動車車体の膜厚との差、即
ち車体毎の塗膜厚のばらつき幅も大幅に減少した。As a result, as shown in FIG. 2, a good coating film was obtained without causing a coating defect in which the coating material adhered in a bridge shape to the gap between the door and the vehicle body W. Further, as shown in FIG. 5, in the method according to the present invention indicated by the solid line, the variation in the coating thickness of each part of the vehicle body was significantly reduced as compared with the method according to the conventional method indicated by the two-dot chain line. In addition, the difference between the film thickness of the thickest electrodeposited car body and the film thickness of the thinnest electrodeposited car body, that is, the variation width of the film thickness for each car body was greatly reduced.
また、自動車車体Ｗを車長方向の軸線回りに毎分１回
転で回転しつつ本発明方法により電着塗装を行なった。
その結果第６図で実線で示す如くほぼ均一な厚さの電着
塗膜を得られた。しかも同図で２点鎖線で示す自動車車
体を回転しつつ従来の方法で電着塗装を行なったものに
比べ車体毎の塗膜厚のばらつき幅も大幅に減少した。The electrodeposition coating was performed by the method of the present invention while rotating the vehicle body W at one revolution per minute around the axis in the vehicle length direction.
As a result, an electrodeposited film having a substantially uniform thickness was obtained as shown by the solid line in FIG. Moreover, the variation width of the coating film thickness for each vehicle body was greatly reduced as compared with the case where the vehicle body shown by the two-dot chain line in FIG.
（発明の効果） このように請求項１の発明によれば、自動車車体の各
部における塗膜厚のばらつきを大幅に減少できると共
に、隙間部分に塗料がブリッジ状に付着するといった塗
装欠陥や塗膜破壊を生じず、ほぼ均一な厚さの電着塗膜
を得られる効果を有する。(Effects of the Invention) As described above, according to the first aspect of the present invention, it is possible to significantly reduce the variation in the coating thickness in each part of the vehicle body, and also to prevent the coating from adhering to the gaps in the form of bridges or coating defects. This has the effect that an electrodeposition coating film having a substantially uniform thickness can be obtained without breaking.
第１図は本発明方法を実施するための電着塗装装置の１
例を示す給電回路を含む概略説明線図、第２図は自動車
車体の隙間部分の塗装状態を示す図、第３図は本発明方
法による電着塗装における電流と電圧の特性図、第４図
は膜厚の測定箇所を示す自動車車体の展開図、第５図は
自動車車体を回転せずに本発明方法と従来の方法とで電
着塗装を行なった場合の各部の膜厚を示す図、第６図は
自動車車体を回転しつつ電着塗装を行なった場合の各部
の膜厚を示す図、第７図は従来の方法による自動車車体
の隙間部分の塗装状態を示す図、第８図は従来の方法に
よる電着塗装における電流と電圧の特性図である。 Ｗ……自動車車体 （１）……電極 （２）……電着槽FIG. 1 shows an electrodeposition coating apparatus 1 for carrying out the method of the present invention.
FIG. 2 is a schematic explanatory diagram including a power supply circuit showing an example, FIG. 2 is a diagram showing a coating state of a gap portion of an automobile body, FIG. 3 is a characteristic diagram of current and voltage in electrodeposition coating by the method of the present invention, FIG. Fig. 5 is a development view of the vehicle body showing the measurement points of the film thickness, Fig. 5 is a diagram showing the film thickness of each part when the electrodeposition coating is performed by the method of the present invention and the conventional method without rotating the vehicle body, FIG. 6 is a diagram showing the film thickness of each part when the electrodeposition coating is performed while rotating the vehicle body, FIG. 7 is a diagram showing a coating state of a gap portion of the vehicle body by a conventional method, and FIG. It is a characteristic diagram of the current and voltage in the electrodeposition coating by the conventional method. W ... Car body (1) ... Electrode (2) ... Electrodeposition tank
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) C25D 13/00 - 13/24──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. 6 , DB name) C25D 13/00-13/24
Claims (1)
極と自動車車体との間に直流電圧を印加して塗膜を形成
する電着塗装方法において、自動車車体と電極との間に
流れる電流値が設定値になるように印加電圧を制御しつ
つ電着塗装を行ない、印加電圧が所定の値に達した後は
この電圧値のままで電着塗装を行ない、且つ、これら電
着塗装を自動車車体を車長方向の軸線回りに回転しつつ
行なうことを特徴とする電着塗装方法。An electrodeposition coating method for immersing an automobile body in an electrodeposition tank and applying a DC voltage between an electrode in the tank and the automobile body to form a coating film. The electrodeposition coating is performed while controlling the applied voltage so that the current value flowing therebetween becomes a set value, and after the applied voltage reaches a predetermined value, the electrodeposition coating is performed at this voltage value, and An electrodeposition coating method comprising: performing electrodeposition coating while rotating an automobile body around an axis in a vehicle length direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2075933A JP2775333B2 (en) | 1990-03-26 | 1990-03-26 | Electrodeposition method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2075933A JP2775333B2 (en) | 1990-03-26 | 1990-03-26 | Electrodeposition method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03274300A JPH03274300A (en) | 1991-12-05 |
| JP2775333B2 true JP2775333B2 (en) | 1998-07-16 |
Family
ID=13590557
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2075933A Expired - Lifetime JP2775333B2 (en) | 1990-03-26 | 1990-03-26 | Electrodeposition method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2775333B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4623823B2 (en) * | 2000-12-26 | 2011-02-02 | 日本ペイント株式会社 | Electrodeposition coating apparatus and electrodeposition coating method for automobile body |
| DE102006044050A1 (en) | 2006-09-20 | 2008-04-03 | Eisenmann Anlagenbau Gmbh & Co. Kg | Process for the electrophoretic coating of workpieces and coating equipment |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5379932A (en) * | 1976-12-23 | 1978-07-14 | Nippon Electric Co | Electrodepositing method |
-
1990
- 1990-03-26 JP JP2075933A patent/JP2775333B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03274300A (en) | 1991-12-05 |
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