EP1134033A2 - Procédé électrostatique de revêtement et appareil pour sa mise en oeuvre - Google Patents

Procédé électrostatique de revêtement et appareil pour sa mise en oeuvre Download PDF

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Publication number
EP1134033A2
EP1134033A2 EP01101707A EP01101707A EP1134033A2 EP 1134033 A2 EP1134033 A2 EP 1134033A2 EP 01101707 A EP01101707 A EP 01101707A EP 01101707 A EP01101707 A EP 01101707A EP 1134033 A2 EP1134033 A2 EP 1134033A2
Authority
EP
European Patent Office
Prior art keywords
voltage
operating current
coating
value
workpiece
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.)
Granted
Application number
EP01101707A
Other languages
German (de)
English (en)
Other versions
EP1134033B1 (fr
EP1134033A3 (fr
Inventor
Jan Reichler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eisenmann Anlagenbau GmbH and Co KG
Original Assignee
Eisenmann Anlagenbau GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Eisenmann Anlagenbau GmbH and Co KG filed Critical Eisenmann Anlagenbau GmbH and Co KG
Publication of EP1134033A2 publication Critical patent/EP1134033A2/fr
Publication of EP1134033A3 publication Critical patent/EP1134033A3/fr
Application granted granted Critical
Publication of EP1134033B1 publication Critical patent/EP1134033B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B05B5/08—Plant for applying liquids or other fluent materials to objects
    • B05B5/10—Arrangements for supplying power, e.g. charging power

Definitions

  • the electrostatic coating of Workpieces with colored powder powders found that the Achieve a desired color, brilliance, effect and gloss effect both from the operating current and from the voltage between the application device and the Workpiece depends. Only if relatively narrow limits are observed for both the operating current and the voltage an efficient and at the same time homogeneous coating possible, which has the desired properties.
  • the distance A I between the application device and the workpiece is brought into play as an additional control parameter.
  • the operating current is not only dependent on the voltage but also on this distance.
  • the distance control therefore makes it possible to keep both the operating current and the voltage within predetermined limits and thereby achieve the desired coating result if a mere change in voltage is not sufficient for this.
  • Such a method can easily be converted into a digital one Control program, e.g. for a data acquisition card with appropriate control inputs and outputs.
  • the detection of the distance ensures that the application device does not take an impermissible distance from the workpiece when the coating is carried out. If the distance becomes too large, there is a risk that the accuracy of the job will be too low. However, there is a greater danger if the distance between the application device and the workpiece becomes too small. In the worst case, a short circuit is possible, which must be avoided. If the regulation is omitted due to an impermissible recorded actual distance value A I , the coating process does not continue and measures can be taken to avert potential dangers.
  • the voltage source and the application device can preferably be deactivated if the actual distance value A I is not within predetermined limits for the distance.
  • Such deactivation is a safe means of countering problems that can be caused when an impermissible distance is reached.
  • a preferred method for a Initialization coating pass the operating parameters the coating device and places it in a cooperating with the tracking device Memory from, during coating runs, the follow the initialization coating pass, the application device according to those stored in the memory Operating parameters are tracked and operated.
  • An operating parameter change as part of the operating current control, during a coating run the initialization coating pass succeeds, can be recorded, stored in memory and for the one following this coating pass Coating passage are taken into account.
  • Such changes in operating parameters in the following Coating processes can be determined by statistical Tolerances of the workpiece or the relative position between Application device and workpiece, but also through Drift effects caused by the coating device become. Knowing the operating parameters in the current coating pass previous coating passes can be used to reduce from for the reasons mentioned above be used.
  • the consideration can take place in such a way that when saving the by in the running coating run changed operating parameters corresponding to these old operating parameters are overwritten.
  • Such a procedure is recommended for long-term Drift processes of the coating device, at knowledge of the operating parameters of each last coating pass is sufficient to for a to avoid future regulatory interventions for a longer period of time.
  • the consideration can take place by that from those changed in the current coating run Operating parameters and the corresponding old operating parameters an operating parameter for the following coating run calculated and saved becomes. Such a procedure is recommended with the statistical sources of error mentioned above. By the averaging here will be the number of those required in the future Control interventions minimized.
  • the calculation can be done by weighted averaging respectively. Such a calculation is simple, needed only a small computing capacity and is for the sufficient for most applications.
  • the object of the present invention is further a To further develop the device of the type mentioned at the beginning, that they keep operating current at the same time and tension within given limits enables.
  • the tracking device cooperates with the control device and can be used to change the distance between the application device and the workpiece, if the function of the voltage control alone cannot keep the actual operating current value I I within the predetermined limits without a predetermined one Leave the voltage range.
  • the coating device shown schematically in FIG. 1 has an application device 1, by means of which electrically charged coating powder 2 (represented by the dash-dotted lines in FIG. 1), for example a paint powder, is applied to a workpiece 3, for example a body element of a vehicle.
  • the flow of the charged coating powder 2 delivered by the application device 1 to the workpiece 3 specifies an instantaneous operating current I I.
  • the application device 1 is a well-known rotary atomizer that doesn't work with one shown storage container for the coating powder communicates.
  • the application device 1 is connected via a high-voltage line 5 to a high-voltage source 6, which is connected to the workpiece 3 via a ground line 7.
  • the high voltage source 6 works together with a high voltage controller 8.
  • the instantaneous actual value of the set voltage at the high voltage source 6 is denoted by U I.
  • the application device 1 for coating the surface of the workpiece 3 can be moved relative to the latter via a guide element 9.
  • the guide element 9 of the application device 1 grants five degrees of freedom of movement. These are the degrees of translational freedom in the directions of the axes X, Y and Z and the degrees of rotational freedom about the axes X and Y.
  • the movement of the application device 1 via the guide element 9 is controlled by a tracking device 10 connected to it.
  • the instantaneous distance of the dispensing element 4 of the application device 1 from the workpiece 3 is denoted by A I.
  • the tracking device 10 and the high-voltage control 8 are of a total of 11 designated control device, which is now based on of Figure 2 is described:
  • the tracking device 10 is connected via a control line 12 to the output of a differential voltage control computer 13.
  • the differential voltage control computer 13 receives the measurement signal of a current measuring device 15 via a measurement data line 14 for measuring the actual current value I I.
  • the differential voltage control computer 13 can a data line 16 preset values from a memory 17 recall.
  • the differential voltage control computer 13 is coupled via a bidirectional data line 18 to a central control computer 19, which in turn is connected via a measurement data line 20 to a high-voltage measuring device 21 for measuring the actual voltage value U I and via a data line 22 to a memory 23 with preset values .
  • the control computer 19 has two output data lines 24, 25 on:
  • the output data line 24 is connected to the High voltage control 8, and the output data line 25 connected to a distance calculator 26.
  • the latter is to a distance measuring device 27 via a measurement data line 28 and to a memory 29 with default values via a Data line 30 coupled.
  • Via an output data line 31 is the distance calculator 26 with an emergency stop circuit 32 connected, the a mechanically operated emergency stop switch 33 has.
  • a control line 39 connects the distance computer 26 to the control line 12 between the differential voltage control computer 13 and the tracking device 10.
  • the distance calculator is via a second output data line 34 26 connected to a distance coordinate calculator 35.
  • the latter is via a bidirectional data line 36 in connection with a coordinate control computer 37. This can be via a bidirectional data line 38 Write coordinates into or from a memory 40 read out.
  • The is via a further bidirectional data line 41 Coordinate control computer 37 with the tracking device 10 coupled.
  • the coating device works during coating of workpieces as follows:
  • the application device 1 follows a tracking program that is in the tracking device 10 is implemented, the surface of the workpiece 3. By a position control that is not of interest here it is ensured that the longitudinal axis of the application device 1 perpendicular to the surface of the workpiece 3, which is to be coated, is aligned.
  • the tracking program ensures the maintenance of one certain distance between the application device 1 and the workpiece 3, unless described below Way to regulate the operating current in a different way intervenes in the tracking program.
  • the high voltage source 6 ensures that the electrodes the application device 4 with respect to the workpiece 3 are at high voltage potential.
  • the electrically charged Coating powder 2 is therefore attracted to the workpiece 3, whereby the latter is coated without becoming a noteworthy amount of not adhering to the workpiece 3 Coating powder overspray that comes with recycling or would have to be disposed of.
  • the actual operating current value I I and the actual voltage value U I are set to a predetermined value by means of the control device 11 regulated within certain limits.
  • the actual value of these parameters is queried at periodic intervals.
  • the part of the coating process that takes place between two queries is referred to below as the "coating step”.
  • the differential voltage control computer 13 of the control device 11 detects the actual operating current value I I via the coupled current measuring device 15 and compares it with an operating current target value I S stored in the memory 17. If the actual operating current value I I lies within the limit values of the operating current tolerance range, which are predetermined by the minimum or maximum values for the operating current likewise stored in the memory 17, readjustment is not carried out and the differential voltage control computer 13 controls the tracking device 10 via the control line 12 which then initiates the next preprogrammed movement step of the guide element 9 according to the tracking program, the distance between the application device 1 and workpiece 3 remaining unchanged.
  • the differential voltage control computer 13 calculates a differential voltage dU by forming the difference between the actual operating current value I I and the target operating current value I S and multiplies this by a negative proportionality factor c 1 likewise stored in the memory 17.
  • the differential voltage control computer 13 passes this voltage difference dU on to the control computer 19 via the data line 18.
  • the control computer 19 adds the differential voltage dU obtained to the actual voltage value U I , which it retrieves from the high-voltage measuring device 21, and thus calculates a new voltage value U N , which theoretically leads back into the permissible range of the actual operating current value I I. If the actual discharge current value I I is too great (cf. the example above), the new voltage value U N is lower than the actual voltage value U I.
  • the control computer 19 transmits the new voltage value U N via the data line 24 to the high voltage controller 8 further. This then sets the actual voltage value U I to the new voltage value U N.
  • the differential voltage control computer 13 receives an OK signal from the high-voltage control 8 about the voltage adjustment carried out.
  • the differential voltage control computer 13 then again performs the comparison between the actual operating current value I I and the target operating current value I S described above.
  • the reduction of the high voltage to the new, lower voltage value U N has led to a sufficient decrease in the actual operating current value I I in the permissible voltage range. If, however, the comparison in the control computer 19 shows that the calculated new voltage value U N , which would lead to a sufficient change in the actual operating current value I I , lies outside the permissible voltage range, the actual operating current value I I is regulated by the control device 11 not by tracking the voltage U I , but by tracking the distance A I between the application device 1 and workpiece 3. This ensures that the actual voltage value U I can be kept within the permissible voltage range.
  • the voltage U I can also be changed first, which leads to the edge of the permissible voltage range. The then required further change in the operating current takes place via a change in the distance A I between the application device 1 and the workpiece 3.
  • the control computer 19 forwards the actual operating current value I I and the desired operating current value I S to the distance computer 26 via the data line 25.
  • the difference between the actual operating current value I I and the desired operating current value I S which is multiplied by a positive proportionality factor c 2 stored in the memory 29, is used to calculate a distance difference dA.
  • the distance calculator then calculates a new distance A N by adding the distance difference value dA to the actual distance value A I retrieved by the distance measuring device 27.
  • the then calculated new distance AN is greater than the actual distance value A I.
  • the distance computer 26 actuates the emergency stop circuit 32 via the control line 31, which deactivates the coating device.
  • the distance computer 26 transmits the new distance value A N to the via the data line 34 Distance coordinate computer 35, which calculates the coordinate correction to be set for the application device 1 from the new distance A N. This coordinate correction is transmitted to the coordinate control computer 37 via the data line 36.
  • the coordinate control computer 37 calculates the new position which the application device 1 is to assume in the current coating step, so that the operating current I I during this coating step reaches the predetermined operating current setpoint I S reached.
  • Coordinates are sent to the tracking device via the data line 41 10 to control a corresponding one Transfer tracking step.
  • differential voltage control computer 13 receives an OK signal about the distance tracking.
  • the differential voltage control computer 13 then makes the comparison between the actual operating current value I I and the operating current target value I S again described in the next query.
  • the current operating parameters are stored in the memory during each coating step 40 filed. If there is no coating step, as described above, a follow-up step is required so the current coordinates from the tracking device 10 via the coordinate adventure calculator and the current operating current and voltage values in the memory 40 saved.
  • the new operating parameters resulting from the control processes are also stored in the memory 40 recorded and implemented in a change in the tracking program for the distance A I and in a corresponding adjustment of the voltage U I.
  • these new operating parameters can overwrite the corresponding old operating parameters, so that each new coating pass for a workpiece the previous one as "starting point" for the "Fine control" has.
  • Such an approach is particularly useful if only slow Drift effects of the coating device are to be expected are that a small adjustment of the distance in longer Require intervals.
  • the new operating parameters can be saved in separate storage locations of the memory 40 are stored.
  • the operating parameters for a particular coating step can within the coating pass.
  • Conclusions about future drift behavior can be drawn become.
  • the memory 40 can then with the coordinate control computer 37 to calculate in the next coating pass communicate the expected coordinates. These are then made in corresponding changes in the tracking program implemented for the next coating run. As a result, the distance is "kept" between the application device 1 and the workpiece 3 and the operating voltage and thus drift compensation, the frequency and size of the rule interventions reduced.
  • the readjustments are mainly due to design tolerances of the workpiece caused, coordinate control computers 37 and memory 40 in the context of a possibly weighted averages work together, so that operating parameters are obtained, which one average dimensioned workpiece, whereby again the number of required control steps is minimized.
  • the absolute value of the proportionality factor c 2 for calculating the change in distance in the distance computer 26 can be chosen such that the change in distance overcompensates for the deviation of the actual discharge current value I I.
  • the distance A I would be increased so that this would result in an actual operating current value I I that would be smaller than the target operating current value I S. So that the correct actual operating current value I I is nevertheless achieved, the distance calculator gives a voltage correction value U K which is determined by means of a third proportionality factor c 3 and the difference between the actual operating current value I I and the target operating current value I S was calculated in the distance computer 26, via a data line 41 (shown in broken lines in FIG. 2) to the high-voltage controller 8.
  • U K is chosen so that on the one hand the operating current reaches the nominal operating current value I S and on the other hand the new actual voltage value U I set by the high-voltage control is as central as possible within the permissible voltage range.
  • the coating device can also learn this in an "initialization pass" on a "master" piece. Within these ranges, the tracking of the operating current I I is interrupted in a permissible range during the subsequent coating processes; if necessary, the entire application device 1 is taken out of operation.

Landscapes

  • Application Of Or Painting With Fluid Materials (AREA)
  • Electrostatic Spraying Apparatus (AREA)
EP01101707A 2000-01-27 2001-01-25 Procédé électrostatique de revêtement et appareil pour sa mise en oeuvre Expired - Lifetime EP1134033B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10003295 2000-01-27
DE2000103295 DE10003295B4 (de) 2000-01-27 2000-01-27 Verfahren zum elektrostatischen Beschichten eines Werkstücks sowie Vorrichtung zur Durchführung des Verfahrens

Publications (3)

Publication Number Publication Date
EP1134033A2 true EP1134033A2 (fr) 2001-09-19
EP1134033A3 EP1134033A3 (fr) 2003-09-17
EP1134033B1 EP1134033B1 (fr) 2006-03-29

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ID=7628768

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01101707A Expired - Lifetime EP1134033B1 (fr) 2000-01-27 2001-01-25 Procédé électrostatique de revêtement et appareil pour sa mise en oeuvre

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EP (1) EP1134033B1 (fr)
DE (2) DE10003295B4 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007003489A1 (de) * 2007-01-24 2008-07-31 LacTec Gesellschaft für moderne Lackiertechnik mbH Lackiereinrichtung
DE102009013561A1 (de) 2009-03-17 2010-10-07 Dürr Systems GmbH Überwachungsverfahren und Überwachungseinrichtung für eine elektrostatische Beschichtungsanlage

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2966880A (en) * 1956-11-23 1961-01-03 Daimler Benz Ag Control arrangement for electrostatic spray installation
DE2451818B2 (de) * 1974-10-31 1977-02-10 Robert Bosch Gmbh, 7000 Stuttgart Verfahren zum elektrostatischen aufbringen von schutzschichten auf ein werkstueck und vorrichtung zu dessen durchfuehrung
DE3709510A1 (de) * 1987-03-23 1988-10-06 Behr Industrieanlagen Verfahren zur betriebssteuerung einer elektrostatischen beschichtungsanlage
US5908162A (en) * 1998-02-25 1999-06-01 Nordson Corporation Spray gun having an anti-back-ionization probe with a control system therefor

Also Published As

Publication number Publication date
DE50109339D1 (de) 2006-05-18
EP1134033B1 (fr) 2006-03-29
DE10003295B4 (de) 2006-05-04
EP1134033A3 (fr) 2003-09-17
DE10003295A1 (de) 2001-08-09

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