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JP3743992B2 - Paint gun paint supply method and paint supply apparatus - Google Patents
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JP3743992B2 - Paint gun paint supply method and paint supply apparatus - Google Patents

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Publication number
JP3743992B2
JP3743992B2 JP02252999A JP2252999A JP3743992B2 JP 3743992 B2 JP3743992 B2 JP 3743992B2 JP 02252999 A JP02252999 A JP 02252999A JP 2252999 A JP2252999 A JP 2252999A JP 3743992 B2 JP3743992 B2 JP 3743992B2
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paint
supply amount
gun
supply
mixing ratio
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JP2000218197A (en
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越 淳 水
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Nissan Motor Co Ltd
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Nissan Motor Co Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は、例えば静電塗装において、複数色の塗料を混合して噴霧する塗装ガンに対して自動制御により塗料を供給するのに用いられる塗装ガンの塗料供給方法および塗料供給装置に関するものである。
【0002】
【従来の技術】
複数色の塗料を混合して用いる静電塗装は、例えば、特開平10−80649号公報に記載されているように、自動車製造における車体塗装の工程で行われている。この静電塗装は、回転霧化式の塗装ガンに複数の塗料流通系を設け、この塗装ガンに対して複数色の塗料を同時に供給し、これらの塗料を塗装ガンにおいて混合して噴霧するものであって、塗料の色の組合わせおよび混合比によって塗装色(明度)が決定される。このような静電塗装は、車体塗装の中塗りや上塗りで行われており、複数色の塗料を混合して用いることにより、少ない色数の塗料でも多くの塗装色が得られるようになり、しかも、塗料の色数の削減に伴って塗装設備の小型化や設備費およびコストの節減等を実現している。
【0003】
また、上記のような自動車の車体塗装では、当然のことながら車体全体を均一に塗装にするのであるが、車体の部位によって塗料の付着状態が異なるため、塗装ガンに対する各塗料の供給量を一定にして車体全体を塗装すると、塗膜の厚さにむらが生じて塗装が不均一なものとなる。そこで、自動車の車体塗装では、車体の各部位に応じて、塗料の混合比を一定に保ちつつ各塗料の供給量を変えることにより、車体全体を均一に塗装するようにしている。このような塗装ガンに対する塗料供給は、自動制御によって行われている。
【0004】
【発明が解決しようとする課題】
ところで、上記したような自動車の車体塗装は、囲まれた塗装ブース内で行っていても、温度や湿度によって塗料の付着状態が変化する。このため、従来の塗装ガンの塗料供給にあっては、温度や湿度の変化に対応して、混合比を考慮しながら各塗料の供給量を算出して供給量の設定を変更していた。しかしながら、1台の車体だけでも、その各部位によって各塗料の供給量を変化させる必要があることから、様々な塗装色が要求される自動車の車体塗装では、塗料供給全体のデータが膨大なものとなり、温度や湿度の変化に応じて各塗料の供給量の設定変更を行う際に、管理工数が非常に多くて作業が煩雑であるという問題点があり、このような問題点を解決することが課題であった。
【0005】
【発明の目的】
本発明は、上記従来の課題に着目して成されたもので、複数色の塗料を混合して噴霧する塗装ガンに対して自動制御により塗料を供給するに際し、各塗料の供給量を設定変更する場合に、その設定変更の管理工数を削減することができる塗装ガンの塗料供給方法および塗料供給装置を提供することを目的としている。
【0006】
【課題を解決するための手段】
本発明に係わる塗装ガンの塗料供給方法は、複数色の塗料を混合して被塗装物に噴霧する塗装ガンに対して自動制御により塗料を供給するに際し、塗料の混合比と混合比に応じて変化する塗装の明度との関係、及び被塗装物の塗装部位と当該塗装部位に応じた塗料の全体供給量との関係を設定し、塗装部位に応じて塗料の全体供給量を調整しつつ、被塗装物に対して予め選択した明度に対応する混合比となるように各塗料の供給量を設定する構成としており、上記の構成をもって従来の課題を解決するための手段としている。
【0007】
本発明に係わる塗装ガンの塗料供給装置は、複数色の塗料を混合して被塗装物に噴霧する塗装ガンに対して自動制御により塗料を供給する装置であって、塗装ガンに対して各塗料を供給する塗料供給手段と、塗料供給手段に対して各塗料の供給量を設定する制御手段を備え、制御手段は、塗料の混合比と混合比に応じて変化する塗装の明度との関係を設定した混合比テーブルと、被塗装物の塗装部位と当該塗装部位に応じた塗料の全体供給量との関係を設定した全体供給量テーブルを備えると共に、塗装部位に応じて全体供給量テーブルの塗料の全体供給量を調整しつつ、混合比テーブルに基づいて被塗装物に対して予め選択した明度に対応する混合比となるように塗料供給手段に対する各塗料の供給量を設定する構成としており、上記の構成をもって従来の課題を解決するための手段としている。
【0008】
なお、上記請求項1および2の構成において、塗料の混合比と塗装の明度との関係は、予め実験を行い、その結果を重回帰分析することにより変換式として表すことができる。この変換式は複数になる場合もある。
【0009】
【発明の作用】
本発明に係わる塗装ガンの塗料供給方法では、複数色の塗料を混合して被塗装物に噴霧する塗装ガンに対して自動制御により塗料を供給するに際し、塗料の混合比と混合比に応じて変化する塗装の明度との関係、及び被塗装物の塗装部位と当該塗装部位に応じた塗料の全体供給量との関係を設定しておき、塗装部位に応じて塗料の全体供給量を調整する。つまり、所定の明度が選択され、その明度に応じた混合比で各塗料を塗装ガンに供給している状態において、被塗装物の塗装部位によって塗料の付着状態に変化が生じ、各塗料の供給量を変更したい場合には、混合比と明度との関係及び塗装部位と全体供給量との関係が予め設定されているので、被塗装物に対して予め選択した明度に対応する混合比となるように塗料の全体供給量だけを調整すれば、明度に対応した混合比を維持しつつ各塗料の供給量が新たに設定されることとなる。
【0010】
本発明に係わる塗装ガンの塗料供給装置では、複数色の塗料を混合して被塗装物に噴霧する塗装ガンに対して自動制御により塗料を供給する装置において、所定の明度を選択すると、制御手段が、塗料の混合比と混合比に応じて変化する塗装の明度との関係を設定した混合比テーブルを備えているので、この混合比テーブルに基づいて選択明度に対応する混合比となるように各塗料の供給量を設定し、これを塗料供給手段に入力することにより、塗料供給手段から各塗料を設定した供給量で塗装ガンに供給する。ここで、被塗装物の塗装部位によって塗料の付着状態に変化が生じ、各塗料の供給量を変更したい場合には、制御手段の全体供給量テーブルに設定されている塗装部位に応じた塗料の全体供給量を調整する。つまり、制御手段が、混合比と明度との関係を予め設定した混合比テーブルを備えているので、全体供給量テーブルの塗装部位に応じた塗料の全体供給量だけを調整すれば、混合比テーブルに基づいて明度に対応した混合比を維持しつつ各塗料の供給量が新たに設定される。これにより、被塗装物に対して予め選択した明度に対応する混合比となるように塗料供給手段から塗装ガンへの各塗料の供給量が変更される。
【0011】
【発明の効果】
本発明に係わる塗装ガンの塗料供給方法によれば、複数色の塗料を混合して被塗装物に噴霧する塗装ガンに対して自動制御により塗料を供給するに際し、塗料の混合比と塗装の明度との関係、及び被塗装物の塗装部位と当該塗装部位に応じた塗料の全体供給量との関係が予め設定されていることから、被塗装物の塗装部位に応じて各塗料の供給量を変更する場合には、塗料の全体供給量だけを調整すれば良く、設定変更の作業の簡略化を実現することができる。したがって、例えば自動車の車体塗装のように、車体の各部位によって塗料の全体供給量が異なり、しかも、様々な塗装色が要求される状況であって、その膨大な塗料供給のデータにおいて、温度や湿度により塗料の付着状態が変化するのに応じて各塗料の供給量を変更する場合に、塗料の全体供給量だけを調整すれば良いので、設定変更の管理工数を大幅に削減することができる。さらに、自動車の車体塗装においては、上記の設定変更に限らず、車体の各部位に対応した塗料の全体供給量の初期設定も容易に行うことができる。
【0012】
本発明に係わる塗装ガンの塗料供給装置によれば、複数色の塗料を混合して被塗装物に噴霧する塗装ガンに対して自動制御により塗料を供給する装置において、制御手段の混合比テーブルに塗料の混合比と塗装の明度との関係が予め設定され、制御手段の全体供給量テーブルに被塗装物の塗装部位と当該塗装部位に応じた塗料の全体供給量との関係が設定されていることから、被塗装物の塗装部位に応じて各塗料の供給量を変更する場合には、全体供給量テーブルに設定されている塗料の全体供給量だけを調整すれば良く、つまり、全体供給量テーブルの書き換えだけを行えば良く、設定変更の作業の簡略化を実現することができる。したがって、請求項1と同様に、例えば自動車の車体塗装において、温度や湿度により塗料の付着状態が変化するのに応じて各塗料の供給量を変更する場合に、設定変更の管理工数を大幅に削減することができ、また、車体の各部位に対応した塗料の全体供給量の初期設定も容易に行うことができる。
【0013】
【実施例】
以下、図面に基づいて、本発明に係わる塗装ガンの塗料供給方法および塗料供給装置の一実施例を説明する。この実施例では、自動車の車体塗装において、中塗りに用いられる塗料供給を示している。
【0014】
図1は、塗装装置の全体を概略的に示すブロック図である。塗装ガンGは、回転霧化式の静電塗装ガンであって、高速回転するカップCに対して2つの塗料流通路A1,A2を備え、図示は省略したが、塗料粒子に高電圧を印荷する電極や塗料粒子を吹き飛ばすシェービングエアの噴射手段などを備えている。この塗装ガンGは、アースされた車体Bに対向した状態にして、各塗料流通路A1,A2を介して所定の混合比で2色の塗料をカップCに供給し、これらの塗料をカップCで混合して噴霧し、その塗装粒子を車体Bに付着させるものである。
【0015】
また、塗装ガンGは、塗装ブース内において、マシンコントローラ1で制御される塗装ロボット等の駆動手段2によって移動可能に保持してある。これに対して、車体Bは、塗装ブース内において、図1中の矢印で示す前方向に一定の低速度で移動している。そして、当該塗装装置は、移動する車体Bを部位センサ3および部位検出手段4で検出して、部位検出手段4からマシンコントローラ1に部位信号を送り、これにより駆動手段1を駆動して、車体Bの各部位に対応して塗装ガンGを上下方向や車体左右方向に移動させるようにしている。
【0016】
塗装ガンGの塗料供給装置は、コンピュータによる自動制御を行うものであって、塗装ガンGに対して各塗料を供給する塗料供給手段5と、塗料供給手段5に対して各塗料の供給量を設定する制御手段6を備えている。塗料供給装置は、第1および第2の2色の塗料に対応して第1および第2の供給部7,8を備えている。第1および第2の供給部7,8は、例えばギアポンプおよびバルブにより構成してあると共に、図示しない色別の塗料タンクと各塗料流通路A1,A2の間に設けてあり、制御手段6からの指令により各塗料の流量を変化させる。また、この実施例の塗料供給手段5は、塗装ガンGに対して電気や空気あるいは洗浄液を供給するための第3の供給部9を備えており、この第3供給部9にあっても制御手段6により制御される。
【0017】
制御手段6は、入力した各種情報から第1および第2の塗料の供給量を設定する主制御部10と、塗料の混合比と混合比に応じて変化する塗装の明度との関係を設定した混合比テーブル11と、塗料の全体供給量を設定した全体供給量テーブル12を備えている。
【0018】
ここで、塗料の混合比と塗装の明度との関係は、予め行った実験により、例えば図2に示すものを得た。図2では横軸を第1塗料の混合比率としている。そして、実験結果を重回帰分析することにより変換式を求めた。この実施例では、混合比と明度との関係を示す曲線▲2▼から、変換式は、y=−ax3+bx2−cx+d(a〜dは定数)の3次方程式で表され、寄与率が0.95以上の高いものとなっている。混合比テーブル11には、塗装色番号(1〜8)とともに明度(20〜90)と混合比を求める変換式が設定してある。これらのデータは一度設定すれば変更する必要はない。
【0019】
また、自動車の車体塗装では、車体Bの各部位によって塗料の付着状態が異なることから、全体供給量テーブル12において、部位番号(1〜11)とともに異なる全体供給量が設定してある。この部位番号は、必ずしも車体Bの前から順に対応させる必要はなく、部位センサ3および部位検出手段4からの信号に基づいて制御手段6の主制御部10で選択すれば良い。
【0020】
上記混合比テーブル11および全体供給量テーブル12の具体例を次の表1および表2に示す。
【0021】
【表1】

Figure 0003743992
【0022】
【表2】
Figure 0003743992
【0023】
ここで、より具体的な例として、混合比テーブル11において、塗装色番号が6である明度70を選択した場合には、図2にも示すように、第1塗料の混合比率が20%となる。すなわち、第1塗料と第2塗料の比は1:4となる。また、混合比テーブル11において、塗装色番号が4である明度50を選択した場合には、同様にして、第1塗料と第2塗料の比は3:2となる。したがって、表2のように全体供給量テーブル12が設定されている場合、各部位番号に対応する個別の塗料供給量は、次の表3および表4に示すようになる。なお、表3および表4は、混合比テーブル11と全体供給量テーブル12から得られる個別の塗料供給量を示すもので、当該塗料供給装置においては、表3および表4を必ずしもテーブル化する必要は無い。
【0024】
【表3】
Figure 0003743992
【0025】
【表4】
Figure 0003743992
【0026】
上記構成を備えた塗装ガンGの塗料供給装置は、塗装ブースに搬入される車体Bの車種信号S1および塗装色信号S2が、制御手段6の主制御部10に入力されると、塗装色信号S2に基づいて、混合比テーブル11における塗装色番号および明度を選択し、その明度に対応した第1および第2の塗料の混合比を決定すると共に、車種信号S1と、部位センサ3および部位検出手段4からの部位信号に基づいて、全体供給量テーブル12における部位番号および塗料の全体供給量を決定する。そして、制御手段6の主制御部10からの指令により、塗料供給手段5の第1および第2の供給部7,8を制御し、各塗料流通路A1,A2を介して塗装ガンGに第1および第2の塗料を供給する。
【0027】
より具体的には、塗装色信号S2により、表1の混合比テーブル11において塗料色番号6である明度70が選択されると、変換式に基づいて第1および第2の塗料の混合比(1:4)を決定する。また、車種信号S1および部位信号により、表2の全体供給量テーブル12において部位番号1が選択されると、この部位番号1に対応する全体供給量200cc/minを決定する。このように、明度により混合比を決定し、且つ全体供給量を決定すれば、表3に示すように、部位番号1における各塗料の供給量が決定されることとなり、これを塗料供給手段5に指令することにより、第1塗料流通路A1には、第1塗料が20cc/minで供給され、第2塗料流通路A2には、第2塗料が80cc/minで供給される。
【0028】
そして、当該塗料供給装置では、車体Bの部位により塗料の付着状態が異なることから、車体Bの移動に伴って、これを検出した部位センサ3および部位検出手段4からの部位信号に基づいて、全体供給量テーブル12の部位番号を順次選択することにより、第1および第2の塗料の混合比を維持しつつ車体Bの各部位に応じて塗料の全体供給量を変化させる。これにより、車体Bは所定の明度で均一に塗装される。
【0029】
また、自動車の車体塗装では、温度や湿度によって塗料の付着状態が変化するので、各塗料の供給量の設定を変更する必要がある。この場合、当該塗料供給方法および塗料供給装置では、塗料の全体供給量だけを調整つまり全体供給量テーブル12を書き換えるだけで良い。
【0030】
すなわち、従来では、温度や湿度によって塗料の付着状態が変化した場合、混合比を考慮しつつ表3や表4に示すような各塗料の供給量を個別に算出して、各塗料の供給量の設定を変更していたが、これに対して、当該塗料供給方法および塗料供給装置では、制御手段6において、混合比と明度との関係(変換式)を予め設定した混合比テーブル11を備えているので、全体供給量テーブル12の塗料の全体供給量だけを調整すれば、混合比テーブル11に基づいて明度に対応した混合比を維持しつつ各塗料の供給量が新たに設定される。
【0031】
したがって、当該塗料供給方法および塗料供給装置では、表3や表4に示すように、明度毎に個別の供給量をテーブル化しておく必要も無く、従来に比べて設定変更に係わる手間が大幅に削減されることとなる。
【0032】
ここで、上記の実施例では、2色の塗料を用いる場合として、表1に示す混合比テーブル11および表2に示す全体供給量テーブル12を例示したが、実際の自動車の車体塗装では、様々な塗装色が要求され、且つ車種も多様である。
【0033】
そこで、混合比テーブル11としては、表1に示すものだけではなく、様々な塗装色に対処し得るように、その他の色の組み合わせに対応したものも複数設定される。このとき、色の組み合わせによって、図2中の点線▲2▼▲3▼に示すように、塗料の混合比と明度との関係も変化する。図2中の点線▲2▼▲3▼の場合には、重回帰分析により求めた変換式として、y=ax2−bx+c▲2▼、およびy=−dx+e▲3▼の2つの式をが用いられる。このように複数の式を用いた場合には、再現性がより向上し、品質(塗装色)をより一層安定させることができる。また、全体供給量テーブル11としては、表2に示すものが1つの車種に対応するのではなく、様々な車種に対処し得るように、さらに多くの全体供給量が設定される。
【0034】
このため、自動車の車体塗装では、制御手段6において、混合比テーブル11および全体供給量テーブル12に設定されるデータがかなり多いものとなるが、先にも述べたように、一度設定した混合比テーブル11を変更する必要は全く無く、全体供給量テーブル12の全体供給量だけを調整するだけで各塗料の供給量が設定変更されるので、設定変更の管理工数は明らかに少なくなる。さらに、当該塗料供給方法および塗料供給装置では、上記の設定変更に限らず、車体Bの各部位に対応した塗料の全体供給量の初期設定つまり全体供給量テーブル12の初期設定も容易になる。
【図面の簡単な説明】
【図1】本発明に係わる塗装ガンの塗料供給方法および塗料供給装置の一実施例において、塗装装置全体を説明するブロック図である。
【図2】塗料の混合比と塗装の明度との関係を説明するグラフである。
【符号の説明】
G 塗装ガン
5 塗料供給手段
6 制御手段
11 混合比テーブル
12 全体供給量テーブル[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a paint supply method and a paint supply apparatus for a paint gun used for supplying paint by automatic control to a paint gun that mixes and sprays paints of a plurality of colors, for example, in electrostatic painting. .
[0002]
[Prior art]
Electrostatic coating using a mixture of paints of a plurality of colors is performed in a vehicle body coating process in automobile manufacture, as described in, for example, Japanese Patent Application Laid-Open No. 10-80649. In this electrostatic painting, a rotary atomizing paint gun is provided with a plurality of paint distribution systems, and a plurality of colors of paint are simultaneously supplied to the paint gun, and these paints are mixed and sprayed in the paint gun. The paint color (brightness) is determined by the combination of color of paints and the mixing ratio. Such electrostatic coating is performed by intermediate coating or top coating of car body coating, and by using a mixture of multiple colors of paint, many paint colors can be obtained even with paint with a small number of colors. Moreover, as the number of paint colors is reduced, the size of the painting equipment is reduced and the equipment costs and costs are reduced.
[0003]
In addition, in the automobile body painting as described above, as a matter of course, the entire body is painted uniformly. However, since the state of paint adhesion varies depending on the body part, the amount of each paint supplied to the painting gun is constant. If the entire vehicle body is painted in this way, the thickness of the coating becomes uneven and the coating becomes uneven. Therefore, in the car body painting of an automobile, the whole body is painted uniformly by changing the supply amount of each paint while keeping the mixing ratio of the paint constant according to each part of the car body. The paint supply to such a paint gun is performed by automatic control.
[0004]
[Problems to be solved by the invention]
By the way, even if the above-described automobile body painting is performed in an enclosed painting booth, the adhesion state of the paint changes depending on the temperature and humidity. For this reason, in the conventional paint supply of a coating gun, the supply amount setting is changed by calculating the supply amount of each paint in consideration of the mixing ratio in response to changes in temperature and humidity. However, since it is necessary to change the supply amount of each paint depending on each part even with only one car body, the data on the entire paint supply is enormous in the car body painting of automobiles that require various paint colors. Therefore, when changing the setting of the supply amount of each paint according to changes in temperature and humidity, there is a problem that the management man-hour is very large and the work is complicated, and it is necessary to solve such problems Was an issue.
[0005]
OBJECT OF THE INVENTION
The present invention has been made paying attention to the above-mentioned conventional problems, and when supplying paint by automatic control to a paint gun that mixes and sprays paints of a plurality of colors, the supply amount of each paint is changed. It is an object of the present invention to provide a paint gun paint supply method and paint supply apparatus that can reduce the man-hours for setting changes.
[0006]
[Means for Solving the Problems]
The paint supply method of the paint gun according to the present invention is based on the paint mixture ratio and the mix ratio when supplying paint by automatic control to a paint gun that mixes paints of a plurality of colors and sprays onto the object to be coated. While setting the relationship between the changing lightness of the paint and the relationship between the painting part of the object to be coated and the total supply amount of paint according to the paint part, adjusting the overall supply amount of paint according to the painting part, The supply amount of each paint is set so as to obtain a mixing ratio corresponding to the brightness selected in advance with respect to the object to be coated, and the above configuration is used as a means for solving the conventional problems.
[0007]
A paint supply device for a paint gun according to the present invention is a device that supplies paint by automatic control to a paint gun that mixes paints of a plurality of colors and sprays them on an object to be coated. Paint supply means for supplying the paint, and control means for setting the supply amount of each paint to the paint supply means. The control means has a relationship between the paint mixing ratio and the paint brightness that changes in accordance with the mixture ratio. In addition to the set mixing ratio table and the total supply amount table that sets the relationship between the coating part of the object to be coated and the total supply amount of the paint according to the coating part, the paint of the total supply amount table according to the coating part While adjusting the overall supply amount, the configuration is such that the supply amount of each paint to the paint supply means is set so as to have a mixing ratio corresponding to the lightness preselected for the object to be coated based on the mixing ratio table, Above structure And a means for solving the conventional problems with.
[0008]
In the configurations of the first and second aspects, the relationship between the paint mixture ratio and the paint brightness can be expressed as a conversion equation by conducting an experiment in advance and performing multiple regression analysis on the result. There may be a plurality of conversion equations.
[0009]
[Effects of the Invention]
In the paint gun paint supply method according to the present invention, when supplying paint by automatic control to a paint gun that mixes paints of a plurality of colors and sprays on the object to be coated, the paint ratio depends on the paint mixture ratio and the mixture ratio. Set the relationship between the changing lightness of the coating, and the relationship between the painted part of the object to be painted and the total supply amount of paint according to the painted part, and adjust the total supply amount of paint according to the painted part . That is, in a state where a predetermined lightness is selected and each paint is supplied to the coating gun at a mixing ratio corresponding to the lightness, the paint adhesion state changes depending on the painting part of the object to be coated, and the supply of each paint When it is desired to change the amount, since the relationship between the mixing ratio and the brightness and the relationship between the coating portion and the total supply amount are set in advance, the mixing ratio corresponds to the lightness selected in advance for the object to be coated. As described above, if only the total supply amount of the paint is adjusted, the supply amount of each paint is newly set while maintaining the mixing ratio corresponding to the lightness.
[0010]
In the paint gun paint supply apparatus according to the present invention, when a predetermined lightness is selected in an apparatus for automatically supplying paint to a paint gun that mixes a plurality of colors of paint and sprays it on the object to be coated, the control means Is provided with a mixing ratio table in which the relationship between the paint mixing ratio and the paint brightness that changes in accordance with the mixing ratio is set, so that the mixing ratio corresponding to the selected brightness is set based on this mixing ratio table. By setting the supply amount of each paint and inputting this to the paint supply means, each paint is supplied from the paint supply means to the paint gun at the set supply amount. Here, when the coating state of the object to be coated changes in the coating state and it is desired to change the supply amount of each paint, the coating material corresponding to the coating site set in the overall supply amount table of the control means is changed. Adjust the total supply. That is, since the control means includes a mixing ratio table in which the relationship between the mixing ratio and the brightness is set in advance, the mixing ratio table can be obtained by adjusting only the total supply amount of the paint according to the coating portion of the total supply amount table. Based on the above, the supply amount of each paint is newly set while maintaining the mixing ratio corresponding to the lightness. Thereby, the supply amount of each coating material from the coating material supply means to the coating gun is changed so that the mixing ratio corresponding to the brightness selected in advance for the object to be coated is obtained.
[0011]
【The invention's effect】
According to the paint supply method for a paint gun according to the present invention, when supplying paint by automatic control to a paint gun that mixes paints of a plurality of colors and sprays them on the object to be coated, the paint mixture ratio and paint brightness And the relationship between the painted part of the object to be painted and the total supply amount of the paint according to the painted part are set in advance. In the case of changing, it is only necessary to adjust the entire supply amount of the paint, and the setting change operation can be simplified. Therefore, for example, the overall supply amount of paint differs depending on each part of the car body, such as car body painting of an automobile, and various paint colors are required. When changing the supply amount of each paint in response to changes in the paint adhesion state due to humidity, it is only necessary to adjust the overall supply amount of the paint, so the management man-hours for setting changes can be greatly reduced. . Furthermore, in the car body painting of an automobile, not only the above setting change but also the initial setting of the total amount of paint supply corresponding to each part of the car body can be easily performed.
[0012]
According to the paint supply device for a paint gun according to the present invention, in a device for supplying paint by automatic control to a paint gun for mixing paints of a plurality of colors and spraying on an object to be coated, the mixing ratio table of the control means is used. The relationship between the paint mixture ratio and the coating lightness is set in advance, and the relationship between the coating portion of the object to be coated and the total coating amount corresponding to the coating portion is set in the total supply amount table of the control means. Therefore, when changing the supply amount of each paint according to the coating part of the object to be coated, it is only necessary to adjust the total supply amount of the paint set in the overall supply amount table, that is, the total supply amount. It is only necessary to rewrite the table, and the setting change operation can be simplified. Therefore, as in claim 1, for example, in car body painting of an automobile, when the supply amount of each paint is changed according to the change in the state of adhesion of the paint depending on the temperature or humidity, the management man-hour for changing the setting is greatly increased. In addition, it is possible to easily set the initial supply amount of the paint corresponding to each part of the vehicle body.
[0013]
【Example】
Hereinafter, an embodiment of a paint gun paint supply method and paint supply apparatus according to the present invention will be described with reference to the drawings. In this embodiment, supply of paint used for intermediate coating in car body painting of an automobile is shown.
[0014]
FIG. 1 is a block diagram schematically showing the entire coating apparatus. The coating gun G is a rotary atomizing electrostatic coating gun, and is provided with two paint flow paths A1 and A2 with respect to the cup C rotating at high speed. Although not shown, a high voltage is applied to the paint particles. It includes a loading electrode, a shaving air injection means for blowing paint particles, and the like. The coating gun G is in a state of facing the grounded vehicle body B, and supplies two colors of paint to the cup C at a predetermined mixing ratio through the paint flow passages A1 and A2, and these paints are supplied to the cup C. Are mixed and sprayed to adhere the coating particles to the vehicle body B.
[0015]
The painting gun G is movably held in a painting booth by driving means 2 such as a painting robot controlled by the machine controller 1. On the other hand, the vehicle body B is moving at a constant low speed in the forward direction indicated by the arrow in FIG. 1 in the painting booth. And the said coating apparatus detects the vehicle body B which moves by the site | part sensor 3 and the site | part detection means 4, sends a site | part signal from the site | part detection means 4 to the machine controller 1, and drives the drive means 1 by this, and drives the vehicle body The coating gun G is moved in the vertical direction or the left-right direction of the vehicle body corresponding to each part of B.
[0016]
The coating material supply device for the painting gun G performs automatic control by a computer. The coating material supply unit 5 supplies each coating material to the coating gun G, and the supply amount of each coating material to the coating material supply unit 5. Control means 6 for setting is provided. The paint supply device includes first and second supply units 7 and 8 corresponding to the first and second two-color paints. The first and second supply parts 7 and 8 are constituted by, for example, gear pumps and valves, and are provided between the paint tanks of different colors (not shown) and the paint flow passages A1 and A2, and from the control means 6 The flow rate of each paint is changed according to the command. In addition, the paint supply means 5 of this embodiment includes a third supply unit 9 for supplying electricity, air, or cleaning liquid to the coating gun G, and the third supply unit 9 is also controlled. Controlled by means 6.
[0017]
The control means 6 sets the relationship between the main control unit 10 that sets the supply amounts of the first and second paints based on the various input information, and the paint lightness that changes according to the paint mixture ratio and the paint ratio. A mixing ratio table 11 and an overall supply amount table 12 in which the overall supply amount of paint is set are provided.
[0018]
Here, the relationship between the mixing ratio of the paints and the brightness of the paint was obtained, for example, as shown in FIG. In FIG. 2, the horizontal axis represents the mixing ratio of the first paint. And the conversion formula was calculated | required by carrying out the multiple regression analysis of the experimental result. In this embodiment, the curve (2) showing the relationship between the mixing ratio and the brightness is expressed by a cubic equation of y = −ax 3 + bx 2 −cx + d (a to d are constants), and the contribution rate Is as high as 0.95 or higher. In the mixing ratio table 11, a conversion formula for determining the lightness (20 to 90) and the mixing ratio is set together with the paint color number (1 to 8). These data do not need to be changed once set.
[0019]
Further, in the car body painting of an automobile, since the adhesion state of the paint varies depending on each part of the car body B, the whole supply amount table 12 is set with different whole supply amounts together with the part numbers (1 to 11). The part numbers do not necessarily correspond in order from the front of the vehicle body B, and may be selected by the main control unit 10 of the control means 6 based on signals from the part sensor 3 and the part detection means 4.
[0020]
Specific examples of the mixing ratio table 11 and the total supply amount table 12 are shown in Tables 1 and 2 below.
[0021]
[Table 1]
Figure 0003743992
[0022]
[Table 2]
Figure 0003743992
[0023]
Here, as a more specific example, in the mixing ratio table 11, when the brightness 70 with the paint color number 6 is selected, the mixing ratio of the first paint is 20% as shown in FIG. Become. That is, the ratio of the first paint to the second paint is 1: 4. Further, in the mixing ratio table 11, when the brightness 50 with the paint color number 4 is selected, the ratio between the first paint and the second paint is 3: 2 in the same manner. Therefore, when the total supply amount table 12 is set as shown in Table 2, the individual paint supply amounts corresponding to the respective part numbers are as shown in Tables 3 and 4 below. Tables 3 and 4 show individual paint supply amounts obtained from the mixing ratio table 11 and the total supply amount table 12. In the paint supply apparatus, Tables 3 and 4 need not necessarily be tabulated. There is no.
[0024]
[Table 3]
Figure 0003743992
[0025]
[Table 4]
Figure 0003743992
[0026]
When the vehicle type signal S1 and the paint color signal S2 of the vehicle body B carried into the paint booth are input to the main control unit 10 of the control means 6, the paint supply device for the paint gun G having the above-described configuration is used. Based on S2, the paint color number and lightness in the mixture ratio table 11 are selected, the mixture ratio of the first and second paints corresponding to the lightness is determined, the vehicle type signal S1, the part sensor 3, and the part detection Based on the part signal from the means 4, the part number in the whole supply amount table 12 and the total supply amount of paint are determined. Then, the first and second supply parts 7 and 8 of the paint supply means 5 are controlled by a command from the main control part 10 of the control means 6, and the first is applied to the paint gun G via the paint flow paths A 1 and A 2. Supply first and second paints.
[0027]
More specifically, when the lightness 70 of the paint color number 6 is selected in the mixture ratio table 11 of Table 1 based on the paint color signal S2, the mixture ratio of the first and second paints ( 1: 4) is determined. Further, when the part number 1 is selected in the whole supply amount table 12 of Table 2 by the vehicle type signal S1 and the part signal, the total supply amount 200 cc / min corresponding to the part number 1 is determined. Thus, if the mixing ratio is determined based on the lightness and the overall supply amount is determined, the supply amount of each paint at the site number 1 is determined as shown in Table 3, and this is applied to the paint supply means 5. To the first paint flow passage A1, the first paint is supplied at 20 cc / min, and the second paint is supplied to the second paint flow passage A2 at 80 cc / min.
[0028]
And in the said coating material supply apparatus, since the adhesion state of a coating material changes with the site | part of the vehicle body B, with the movement of the vehicle body B, based on the site | part signal from the site | part sensor 3 and the site | part detection means 4 which detected this, By sequentially selecting the part numbers in the overall supply amount table 12, the overall supply amount of the paint is changed according to each part of the vehicle body B while maintaining the mixing ratio of the first and second paints. Thus, the vehicle body B is uniformly painted with a predetermined brightness.
[0029]
Further, in the car body painting of an automobile, the state of paint adhesion changes depending on the temperature and humidity, so it is necessary to change the setting of the supply amount of each paint. In this case, in the paint supply method and the paint supply apparatus, only the total supply amount of the paint is adjusted, that is, the entire supply amount table 12 may be rewritten.
[0030]
That is, conventionally, when the coating state changes depending on temperature and humidity, the supply amount of each paint as shown in Tables 3 and 4 is calculated individually in consideration of the mixing ratio, and the supply amount of each paint is calculated. However, in the paint supply method and the paint supply apparatus, the control means 6 includes a mixture ratio table 11 in which the relationship between the mixture ratio and the brightness (conversion formula) is set in advance. Therefore, if only the total supply amount of the paint in the total supply amount table 12 is adjusted, the supply amount of each paint is newly set while maintaining the mixing ratio corresponding to the lightness based on the mixing ratio table 11.
[0031]
Therefore, in the paint supply method and paint supply apparatus, as shown in Tables 3 and 4, there is no need to table individual supply amounts for each lightness, and the labor involved in changing the setting is significantly greater than in the past. It will be reduced.
[0032]
Here, in the above-described embodiment, the mixture ratio table 11 shown in Table 1 and the total supply amount table 12 shown in Table 2 are exemplified as the case where two colors of paint are used. A special paint color is required, and there are various types of vehicles.
[0033]
Therefore, as the mixing ratio table 11, not only those shown in Table 1 but also a plurality of combinations corresponding to other color combinations are set so that various paint colors can be dealt with. At this time, depending on the combination of colors, as shown by dotted lines (2) and (3) in FIG. If in Fig. 2 in dashed ▲ 2 ▼ ▲ 3 ▼ of, as a conversion formula determined by regression analysis, y = ax 2 -bx + c ▲ 2 ▼, and y = -dx + e ▲ 3 ▼ 2 two equations of Used. Thus, when a plurality of formulas are used, reproducibility is further improved, and quality (paint color) can be further stabilized. Further, as the total supply amount table 11, a larger total supply amount is set so that the table shown in Table 2 does not correspond to one vehicle type but can deal with various vehicle types.
[0034]
For this reason, in the car body painting of an automobile, the control means 6 has a large amount of data set in the mixing ratio table 11 and the total supply amount table 12, but as described above, once the mixing ratio is set. There is no need to change the table 11, and the supply amount of each paint is set and changed only by adjusting only the total supply amount of the total supply amount table 12. Therefore, the management man-hour for changing the setting is obviously reduced. Furthermore, in the paint supply method and the paint supply apparatus, not only the above setting change but also the initial setting of the total supply amount of paint corresponding to each part of the vehicle body B, that is, the initial setting of the total supply amount table 12 is facilitated.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating the entire coating apparatus in an embodiment of a coating gun paint supply method and paint supply apparatus according to the present invention.
FIG. 2 is a graph for explaining the relationship between the mixing ratio of paints and the brightness of paint.
[Explanation of symbols]
G Coating gun 5 Paint supply means 6 Control means 11 Mixing ratio table 12 Whole supply amount table

Claims (2)

複数色の塗料を混合して被塗装物に噴霧する塗装ガンに対して自動制御により塗料を供給するに際し、塗料の混合比と混合比に応じて変化する塗装の明度との関係、及び被塗装物の塗装部位と当該塗装部位に応じた塗料の全体供給量との関係を設定し、塗装部位に応じて塗料の全体供給量を調整しつつ、被塗装物に対して予め選択した明度に対応する混合比となるように各塗料の供給量を設定することを特徴とする塗装ガンの塗料供給方法。  When supplying paint by automatic control to a paint gun that mixes paints of multiple colors and sprays on the object to be coated, the relationship between the paint mixture ratio and the paint brightness that changes according to the mixture ratio, and the paint Corresponding to the pre-selected lightness for the object to be coated while setting the relationship between the painted part of the object and the total supply amount of paint according to the painted part and adjusting the total supply amount of paint according to the painted part A paint gun paint supply method, wherein a supply amount of each paint is set so as to achieve a mixing ratio. 複数色の塗料を混合して被塗装物に噴霧する塗装ガンに対して自動制御により塗料を供給する装置であって、塗装ガンに対して各塗料を供給する塗料供給手段と、塗料供給手段に対して各塗料の供給量を設定する制御手段を備え、制御手段は、塗料の混合比と混合比に応じて変化する塗装の明度との関係を設定した混合比テーブルと、被塗装物の塗装部位と当該塗装部位に応じた塗料の全体供給量との関係を設定した全体供給量テーブルを備えると共に、塗装部位に応じて全体供給量テーブルの塗料の全体供給量を調整しつつ、混合比テーブルに基づいて被塗装物に対して予め選択した明度に対応する混合比となるように塗料供給手段に対する各塗料の供給量を設定することを特徴とする塗装ガンの塗料供給装置。  A device that supplies paint by automatic control to a paint gun that mixes paints of multiple colors and sprays on the object to be coated. The paint supply means supplies paint to the paint gun, and the paint supply means Control means for setting the supply amount of each paint, and the control means is a mixture ratio table in which the relation between the paint mixture ratio and the lightness of paint that changes in accordance with the mixture ratio is set; Mixing ratio table while adjusting the total supply amount of paint in the total supply amount table according to the coating part and the total supply amount table that sets the relationship between the part and the total supply amount of paint according to the coating part A paint gun paint supply apparatus, wherein the supply amount of each paint to the paint supply means is set so as to obtain a mixing ratio corresponding to the lightness selected in advance for the object to be coated.
JP02252999A 1999-01-29 1999-01-29 Paint gun paint supply method and paint supply apparatus Expired - Fee Related JP3743992B2 (en)

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