US20240141539A1 - Method for operating a treatment system, treatment system, and computer program product - Google Patents
Method for operating a treatment system, treatment system, and computer program product Download PDFInfo
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- US20240141539A1 US20240141539A1 US18/557,388 US202218557388A US2024141539A1 US 20240141539 A1 US20240141539 A1 US 20240141539A1 US 202218557388 A US202218557388 A US 202218557388A US 2024141539 A1 US2024141539 A1 US 2024141539A1
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- 238000000034 method Methods 0.000 title claims abstract description 47
- 238000004590 computer program Methods 0.000 title claims abstract description 10
- 239000003973 paint Substances 0.000 claims abstract description 44
- 238000003618 dip coating Methods 0.000 claims abstract description 24
- 238000010422 painting Methods 0.000 claims abstract description 13
- 239000002184 metal Substances 0.000 claims abstract description 11
- 230000033228 biological regulation Effects 0.000 claims description 146
- 239000011248 coating agent Substances 0.000 claims description 66
- 238000000576 coating method Methods 0.000 claims description 66
- 230000001105 regulatory effect Effects 0.000 claims description 31
- 230000000694 effects Effects 0.000 claims description 9
- 239000012530 fluid Substances 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 8
- 239000003792 electrolyte Substances 0.000 claims description 5
- 230000003044 adaptive effect Effects 0.000 claims description 4
- 239000002904 solvent Substances 0.000 claims description 4
- 239000011230 binding agent Substances 0.000 claims description 3
- 239000000049 pigment Substances 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 238000007598 dipping method Methods 0.000 abstract description 3
- 230000002349 favourable effect Effects 0.000 description 30
- 210000000746 body region Anatomy 0.000 description 8
- 239000010410 layer Substances 0.000 description 8
- 230000006978 adaptation Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 230000002950 deficient Effects 0.000 description 4
- 239000011247 coating layer Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000001652 electrophoretic deposition Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000001962 electrophoresis Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 239000003232 water-soluble binding agent Substances 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D13/00—Electrophoretic coating characterised by the process
- C25D13/12—Electrophoretic coating characterised by the process characterised by the article coated
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D13/00—Electrophoretic coating characterised by the process
- C25D13/18—Electrophoretic coating characterised by the process using modulated, pulsed, or reversing current
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D13/00—Electrophoretic coating characterised by the process
- C25D13/22—Servicing or operating apparatus or multistep processes
Definitions
- Examples disclosed herein relate to a method for operating a treatment plant for the electrophoretic dip painting of a metal workpiece, in particular a vehicle body, and to a treatment plant and a computer program product for carrying out the method.
- electrophoretic dip coating plants for instance cathodic dip coating plants (CDC plants)
- vehicle bodies are for example pretreated and/or painted by immersing them in dip baths in which paint is applied by means of electrophoresis.
- Electrophoretic deposition is a widespread industrial process in which colloidal particles are deposited on a workpiece as an electrode under the influence of an electric field.
- the workpiece for example a vehicle body, is immersed in an electrically conductive aqueous dipping paint and a DC voltage field is applied between the workpiece and a counterelectrode.
- the basic principle of electrodip painting consists in precipitating water-soluble binders on the surface of the workpiece connected as an electrode, and thus generating a continuous adhering paint film.
- the object of examples disclosed herein is to provide a method for operating a treatment plant for the electrophoretic dip coating of a metal workpiece, in particular a vehicle body, with which a better coating outcome can be achieved.
- a further object consists in providing a treatment plant for electrophoretic dip coating, with which a better coating outcome can be achieved.
- a further object consists in providing a computer program product with which the improved method can be carried out.
- the busbar is subdivided into individual busbar sections. On each busbar section, there is only ever one body, the length of each busbar section being less than the cycle distance of the successive bodies.
- each busbar section is determined by a corresponding measuring device of a current supply unit.
- the workpiece is thus respectively arranged during the treatment only in the region of one busbar section.
- the busbar section may be longer or shorter than the workpiece, although it is expediently always shorter than the cycle distance between the workpieces.
- the electrophoretic dip coating may be cathodic dip coating, in which the workpiece to be coated is connected as a cathode, or anodic dip coating, in which the workpiece to be coated is connected as an anode.
- cathodic dip coating the electrodes are filled with an anolyte as electrolyte fluid.
- anodic dip coating a separate anolyte system is not required as in the case of cathodic dip coating.
- regulation of the electrical current supplied to the workpiece may be carried out.
- the electrical current for the current regulation may favorably be determined in each busbar section.
- the current regulation advantageously also allows simple specification of the desired coating current for each busbar section in the case of a current supply unit having modular rectifier modules. In this way, a better coating outcome may be achieved on the treated vehicle body.
- an electrical voltage may be applied to the workpiece by means of at least two electrically equivalent electrodes arranged in the dip bath in the region of action of the at least one busbar section, at least one rectifier module being connected to at least one of the electrodes, the current supplied to the workpiece forming a sum of the partial currents supplied by the individual rectifier modules, and a jointly regulated voltage setpoint value for the individual rectifier modules in the region of the workpiece being derived from a specified current setpoint value of the total current supplied to the workpiece and being specified to the individual rectifier modules.
- each of these rectifier modules may be electrically connected to an electrode or a group of electrodes, or a plurality of rectifier modules may be connected to a common electrode.
- the voltage in the dip baths may be controlled or regulated very accurately.
- a body treatment section which also corresponds to a busbar section
- a plurality of electrodes are used, which may be arranged on both sides of the body in order to achieve a favorable treatment outcome.
- a body treatment section which also corresponds to a busbar section
- electrodes are typically used, which may be arranged on both sides of the body in order to achieve a favorable treatment outcome.
- flat or semi-round electrodes from ten to sixteen electrodes may be provided. In the case of round electrodes, up to forty electrodes may be provided. Depending on the plant, more or fewer electrodes may of course be provided.
- All the rectifier modules have a common pole, in the case of cathodic coating a common negative pole and in the case of anodic coating a common positive pole, which is connected to the bodies via a busbar having individual busbar sections.
- a total current for the treatment of the body may thus be specified and regulated, which is made up of the sum of the individual partial current values of the at least one electrode and of their at least one supplying rectifier module. Particularly in the case of a plurality of rectifier modules, these may be controlled and/or regulated independently of one another.
- a current-led operating mode of the treatment unit may therefore advantageously be set up and implemented.
- an equal average voltage setpoint value may be specified for the rectifier modules and the voltage at the rectifier modules may be regulated so that the respectively specified total current setpoint value is reached.
- the body is connected via the busbar to the common pole of the rectifier modules.
- the flow of current to the busbar is measured and corresponds to the current consumption of the body.
- the voltage regulation is switched over to current regulation.
- the average voltage of all the electrodes in the region of a body, without a run-in and run-out of the treatment, may for example be calculated in a PLC program of a control unit and assigned to the currently occupied busbar section.
- all the electrodes in the treatment region including the run-in and run-out, receive the same voltage setpoint value.
- the voltage is regulated so that the desired current setpoint value is reached.
- the voltage may in this case vary between two setpoint values, namely a minimum voltage of the current regulation and a maximum voltage of the current regulation.
- PID regulation may be used for each busbar section, an average voltage of the respectively preceding busbar section being used as a start value for the PID regulation.
- each busbar section separate PID regulation may thus be used and adapted according to requirements.
- the so-called Y offset value an average voltage of the preceding busbar section may for example always be adjusted. It is therefore possible to ensure that the voltage is regulated constantly over the entire feed path and voltage jumps can be avoided.
- a lower limit voltage and an upper limit voltage may be specified for the current regulation.
- the voltage may thus vary during the current regulation between two setpoint values, namely a minimum voltage of the current regulation and a maximum voltage of the current regulation.
- the voltage is specified and the partial current varies between 0 A and the maximum possible partial current per rectifier module.
- the voltage is increased via an adjustable ramp from 0 V to the desired setpoint value.
- the treatment of the workpiece may be carried out by means of charge quantity regulation, by regulating the current through the busbar section so that a specified charge setpoint value is reached.
- the total charge quantity represents a measure of the coating thickness of the coating material deposited, for example the paint deposited.
- charge quantity regulation may ensure that the same charge quantity, i.e. amount of coating material from the paint, is always deposited for each body.
- a fluctuation in the paint temperature may for example be compensated for automatically by means of a charge quantity regulator, so that all the coated, in particular painted, vehicle bodies have a favorable coating outcome. In this way, the paint consumption and the coating quality may be optimized.
- the charge quantity regulation may favorably be activated.
- a charge quantity still required in order to reach the desired charge setpoint value and a residual coating time until the body starts to be extracted from the paint may be determined.
- the charge quantity delivered by the rectifier modules may thus be kept constant during the coating. In this way, it is possible to ensure that a favorable coating outcome is guaranteed for all the bodies.
- the coating layer thickness may be optimized and kept constant. During the coating, material costs may therefore be saved and quality problems due to defective coating may be avoided.
- the current setpoint value for the charge quantity regulation is determined as a quotient of a charge quantity still required and a remaining treatment time.
- the coating current is regulated.
- the current setpoint value is calculated continuously in order to reach the desired charge quantity:
- the charge quantity regulation When the charge quantity regulation is active, the total current through the body is regulated to the calculated setpoint value.
- the voltage varies automatically between the adjustable minimum and maximum.
- the charge reached is checked and compared with the specified limit values. If the limits are exceeded or fallen below, corresponding warning or fault messages may be output.
- the charge setpoint value may be adapted during the charge quantity regulation by means of adaptive regulation, the regulation being carried out as a function of treatment parameters.
- the regulation may be carried out as a function of at least one of the following parameters: paint parameters, in particular a binder content, pigment content, solvent content, pH, electrical conductivity of the electrolyte fluid, in particular the anolyte fluid, of the treatment process.
- paint parameters in particular a binder content, pigment content, solvent content, pH
- electrical conductivity of the electrolyte fluid in particular the anolyte fluid, of the treatment process.
- cathodic dip coating the electrodes are filled with an anolyte.
- acid is formed on the workpiece and a separate anolyte system is not required as in the case of cathodic dip coating.
- additional parameters may be taken into account.
- adaptive regulation which adapts automatically to the charge setpoint value of the body by means of external process parameters.
- External parameters may inter alia be the paint parameters, for example binder content, pigment content, solvent content, pH, electrical conductivity and electrical conductivity in the electrolyte fluid, in particular the anolyte fluid.
- the relationship between these external parameters and the charge consumption may, for example, be stored in a mathematical formula in the PLC program of a control unit of the current supply unit.
- the charge setpoint value may be reduced by a particular charge value. If the pH of the paint lies below the setpoint value, on the other hand, the charge setpoint value may be increased by a particular amount.
- the charge setpoint value may be adapted during the charge quantity regulation as a function of a measured thickness, deposited from the paint on the workpiece, of a coating, in particular a coating that comprises paint particles.
- the layer thickness of each body may be determined automatically by means of a layer thickness measurement after the electrophoretic coating. If the layer thickness is too high, the charge setpoint value is automatically reduced. If the layer thickness is too low, the charge setpoint value is automatically increased.
- the treatment may be carried out by means of voltage regulation, by the setpoint voltage of the rectifier modules being increased to a voltage setpoint value via an adjustable voltage ramp.
- the initial current which rises very steeply at the start of the treatment, may be regulated favorably.
- the applied coating in particular the paint, increasingly has an insulating effect, the current decreases. This value may be adjusted favorably by means of the voltage setpoint value.
- the treatment of the workpiece may be carried out over a specified time interval by means of voltage regulation, and may then be carried out by means of current regulation coupled with charge quantity regulation until a specified charge setpoint value is reached.
- relatively rapid coating with a first coating thickness may advantageously be achieved by means of the voltage regulation, and this may then be operated further by means of the subsequent charge quantity regulation to the desired coating thickness.
- the voltage setpoint values of the rectifier modules which supply the electrodes that are assigned to these regions along the feed direction, may be adapted.
- individual body regions may be influenced in a controlled way.
- the voltage is increased or reduced in particular body regions in order to influence the layer thickness, for example with a voltage adaptation of at most +/ ⁇ 20%.
- a body region may in this case expediently always be larger than the distance between two electrodes.
- Favorable for this operating mode are small electrodes, for example round electrodes and as many rectifier units as possible, so that the dip bath may be subdivided into many small voltage regions.
- a treatment plant is proposed for the electrophoretic dip coating, in particular dip painting, of a metal workpiece, in particular a vehicle body, in a dip bath filled with a paint, for carrying out a method as described above.
- the treatment plant comprises at least: at least two electrically equivalent electrodes, which in particular are arranged on both sides of the workpiece, a busbar, which is arranged along a feed direction of the workpiece in the dip bath and is subdivided into individual busbar sections, the busbar being electrically connected to the workpiece, and at least one current supply unit having at least one rectifier module, one pole of the at least one rectifier module being electrically connected to at least one of the at least two equivalent electrodes, and the other pole of the at least one rectifier module being electrically connected to the busbar, and the at least two electrically equivalent electrodes applying an electrical voltage to the workpiece.
- the busbar is subdivided into individual busbar sections. On each busbar section, there is respectively only one workpiece, for instance a body, during the treatment, the length of each busbar section being less than the cycle distance of successive bodies.
- the current that flows to each busbar is determined by means of a corresponding measuring device of a current supply unit. The workpiece is thus respectively arranged during the treatment only in the region of one busbar section, which is shorter than the cycle distance.
- the treatment plant may be configured for current regulation of the electrical current supplied to the workpiece.
- the electrical current is determined in each busbar section for the current regulation.
- the current regulation advantageously allows simple specification of the desired coating current for each busbar section even in the case of a current supply unit having modular rectifier modules. An improved coating outcome on the vehicle body being treated may therefore be achieved.
- the at least one current supply unit may be configured to operate the rectifier modules respectively separately by means of voltage regulation.
- the body is connected by means of the busbar to the common pole of the rectifier modules.
- the flow of current to the busbar is measured and corresponds to the current consumption of the body.
- the voltage regulation is switched over to current regulation.
- the average voltage of all the electrodes in the region of a body, without a run-in and run-out of the treatment, may for example be calculated in a PLC program of a control unit and assigned to the currently occupied busbar.
- all the electrodes in the treatment region including the run-in and run-out, receive the same voltage setpoint value.
- the voltage is regulated so that the desired current setpoint value is reached.
- the voltage may in this case vary between two setpoint values, namely a minimum voltage of the current regulation and a maximum voltage of the current regulation.
- the at least one current supply unit may be configured to operate the rectifier modules by means of current regulation coupled with charge quantity regulation by means of the current of a busbar section.
- the total charge quantity represents a measure of the coating thickness of the coating applied, in particular the coating comprising paint particles.
- charge quantity regulation may ensure that the same charge quantity is always deposited for each body.
- a fluctuation in the paint temperature may for example be compensated for automatically by means of a charge quantity regulator, so that all the coated vehicle bodies have a favorable coating outcome. In this way, the paint consumption and the coating quality may be optimized.
- the at least one current supply unit may be configured to operate the rectifier modules in a first time interval by means of voltage regulation and in a second time interval by means of current regulation coupled with charge quantity regulation until a specified charge setpoint value is reached.
- the charge quantity regulation may favorably be activated.
- a charge quantity still required in order to reach the desired charge setpoint value and a residual coating time until the body starts to be extracted from the paint of the dip bath may be determined.
- the charge quantity delivered by the rectifier modules may thus be kept constant during the coating. In this way, it is possible to ensure that a favorable coating outcome is guaranteed for all the bodies.
- the layer thickness deposited may be optimized and kept constant. During the coating, material costs may therefore be saved and quality problems due to defective coating may be avoided.
- relatively rapid coating with a first coating thickness may advantageously be achieved by means of the voltage regulation, and this may then be operated further by means of the subsequent charge quantity regulation to the desired coating thickness.
- a computer program product for carrying out the method according to examples disclosed herein, in order to operate a treatment plant for the electrophoretic dip coating, in particular dip painting, of a metal workpiece, in particular a vehicle body, in a dip bath filled with a paint, in which the workpiece is moved in a feed direction along a busbar and electrodes supplied by rectifier modules.
- the computer program product comprises at least one computer-readable storage medium having program code instructions stored thereon, wherein the effect of the program code instructions which can be executed by a data processing system is that, during the residence of the workpiece in the region of action of at least one busbar section of the busbar, an electrical current is at least temporarily supplied to the workpiece by the at least one busbar section.
- the effect of the program code instructions which can be executed by the data processing system may be that, the treatment of the workpiece is carried out at least temporarily by means of current regulation, by a current setpoint value being specified for a busbar section of the busbar, an equal regulated voltage setpoint value being specified for the rectifier modules and the voltage being regulated so that the specified current setpoint value is reached; and/or that the treatment of the workpiece is carried out by means of charge quantity regulation, by the current through the busbar section being regulated in order to reach a specified charge setpoint value; and/or that the treatment of the workpiece is carried out over a first time interval by means of voltage regulation and in a second time interval by means of current regulation coupled with charge quantity regulation until a specified charge setpoint value is reached; and/or that for controlled treatment of individual regions of the workpiece, voltage setpoint values of the rectifier modules, which supply the electrodes in these regions, are adapted.
- a total current for the treatment of the body may thus be specified and regulated, which is made up of the sum of the individual partial current values of the individual electrodes and of their supplying rectifier modules, controlled independently of one another.
- a current-led operating mode of the treatment unit may therefore advantageously be set and implemented.
- the charge quantity delivered by the rectifier modules may thus be kept constant during the coating. In this way, it is possible to ensure that a favorable coating outcome is guaranteed for all the bodies.
- the layer thickness deposited may be optimized and kept constant. During the coating, material costs may therefore be saved and quality problems due to defective coating may be avoided.
- FIG. 1 shows an exemplary embodiment of examples disclosed herein with a treatment plant
- FIG. 2 shows a schematic representation of the treatment plant with exemplary values of current regulation according to one exemplary embodiment of examples disclosed herein;
- FIG. 3 shows a schematic representation of the treatment plant with exemplary values of a setpoint value adaptation during voltage regulation in order to weight individual workpiece regions according to one exemplary embodiment of examples disclosed herein;
- FIG. 4 shows a schematic representation of the treatment plant with exemplary values of a setpoint value adaptation during current regulation in order to weight individual workpiece regions according to one exemplary embodiment of examples disclosed herein;
- FIG. 5 shows a typical voltage/current profile during the treatment in the case of a charge-regulated operating mode of the method according to one exemplary embodiment of examples disclosed herein.
- FIG. 1 shows an exemplary embodiment of examples disclosed herein with a treatment plant 100 .
- the treatment plant 100 for the electrophoretic, for example cathodic, dip painting of a metal workpiece 40 , in particular a vehicle body, in a dip bath filled with a paint comprises a multiplicity of electrodes 32 , which in particular are arranged on both sides of the workpiece 40 .
- a relative movement between the workpiece 40 and a busbar 21 is carried out in the dip bath 30 , i.e. with the busbar 21 stationary the workpiece is moved in the dip bath 30 between the likewise stationary electrodes 32 in the feed direction 42 .
- the workpiece 40 to be coated is connected as a cathode and the electrodes are filled with an anolyte.
- the treatment plant 100 furthermore comprises a busbar 21 , which is arranged along a feed direction 42 of the workpiece 40 in the dip bath 30 and is subdivided into individual busbar sections 22 , 24 , 26 .
- the busbar sections 22 , 24 , 26 have a length 46 , which may be adapted to a length 44 of the workpiece 40 in the feed direction 42 .
- the busbar sections 22 , 24 , 26 may have the same length as, but may also be longer or shorter than the workpiece 40 , although expediently they are always shorter than the cycle distance.
- the busbar 21 is electrically connected to the workpiece 40 , for example by means of power cables. This, however, is not represented in FIG. 1 .
- each busbar section 22 , 24 , 26 there is always only one body, the length of each busbar section 22 , 24 , 26 being less than the cycle distance of the successive bodies.
- the current that flows to each busbar section 22 , 24 , 26 is determined by a corresponding measuring device 18 of a current supply unit 10 .
- the workpiece 40 is thus respectively arranged during the treatment only in the region of one busbar section 22 , 24 , 26 , which corresponds for example to a length of the workpiece 40 .
- the electrical current is determined in each busbar section 22 , 24 , 26 for the current regulation.
- the current regulation advantageously allows simple specification of the desired coating current for each busbar section 22 , 24 , 26 even in the case of a current supply unit 10 having modular rectifier modules 12 . An improved coating outcome on the vehicle body being treated may therefore be achieved.
- rectifier modules 12 may respectively expediently be used for the current supply of the electrodes 32 .
- Each of these rectifier modules 12 supplies an electrode 32 or a group of electrodes 32 with direct current.
- the voltage in the dip baths 30 may be controlled very accurately.
- a plurality of rectifier modules 12 may also be provided for an electrode 32 .
- a body treatment section which also corresponds to a busbar section 22 , 24 , 26 , from ten to sixteen flat or semi-round electrodes 32 are used, which may be arranged on both sides of the body in order to achieve a favorable treatment outcome.
- round electrodes 32 even more, for instance up to forty, may be provided. More or fewer electrodes may respectively be provided.
- All the rectifier modules 12 have a common pole 16 , which is connected to the bodies via a busbar 21 having individual busbar sections 22 , 24 , 26 .
- the common pole 16 is the negative pole, while in the case of an anodic dip coating the common pole 16 would be the positive pole.
- a total current for the treatment of the body may thus be specified and regulated, which is made up of the sum of the individual partial current values 75 of the individual electrodes 32 and of their supplying rectifier modules 12 , which may be controlled independently of one another.
- a current-led operating mode of the treatment unit 100 may therefore advantageously be set and implemented.
- two current supply units 10 have a multiplicity of rectifier modules 12 .
- a positive pole 14 of one rectifier module 12 is electrically connected to at least one electrode 32 .
- the negative poles 16 of all the rectifier modules 12 are electrically connected to the busbar 21 .
- an electrical voltage may thus be applied to the workpiece 40 .
- the workpiece 40 is respectively arranged only in the region of one busbar section 22 , 24 , 26 during the treatment.
- the treatment plant 100 is configured for current regulation of the electrical current supplied to the workpiece 40 .
- the electrical current may be determined separately in each busbar section 22 , 24 , 26 by means of current measuring units 18 .
- the negative pole 16 of the rectifier modules 12 is electrically connected to the busbar sections 22 , 24 , 26 via the current measuring units 18 , and optionally via a coupling thyristor 28 .
- the rectifier modules 12 may respectively be operated separately by means of voltage regulation.
- the rectifier modules 12 may be operated by means of current regulation coupled with charge quantity regulation via the current of a busbar section 22 , 24 , 26 .
- the current supply units 10 are configured to operate the rectifier modules 12 in a first time interval by means of voltage regulation and in a second time interval by means of current regulation coupled with charge quantity regulation until a specified charge setpoint value 80 is reached.
- the current supplied to the workpiece 40 forms the sum of the partial currents supplied by the individual rectifier modules 12 , a voltage setpoint value 71 for the rectifier modules 12 in the region of the workpiece 40 to be coated being derived from a specified current setpoint value of the total current supplied to the workpiece 40 and specified to the individual rectifier modules 12 .
- An equal average voltage setpoint value 71 (represented in FIG. 2 ) may be specified for the rectifier modules 12 and the voltage at the rectifier modules 12 may be regulated so that the respectively specified total current of the workpiece 40 is reached.
- PID regulation may for example be used for each busbar section 22 , 24 , 26 , wherein an average voltage of the respectively preceding busbar section 22 , 24 , 26 may be used as a start value for the PID regulation.
- a lower limit voltage and an upper limit voltage may be expediently specified for the current regulation.
- each busbar section 22 , 24 , 26 separate PID regulation may thus be used.
- the so-called Y offset value an average voltage of the preceding busbar section 22 , 24 , 26 may for example always be adjusted. It is therefore possible to ensure that the voltage is regulated constantly over the entire feed path and no voltage jumps occur.
- the current regulation is stopped and the electrodes 32 keep their current voltage or a special extraction voltage is applied to them.
- the body is connected via the busbar 21 to the common negative pole 16 of the rectifier modules 12 .
- the flow of current to the busbar 21 is measured and corresponds to the current consumption of the body.
- the voltage regulation is switched over to current regulation.
- the average voltage of all the electrodes 32 in the region of a body, without a run-in and run-out of the treatment, may for example be calculated in a PLC program of a control unit and assigned to the currently occupied busbar section 22 , 24 , 26 .
- all the electrodes 32 in the treatment region receive the same voltage setpoint value 71 .
- the voltage is regulated so that the desired current setpoint value is reached.
- the voltage 70 may in this case vary between two setpoint values, namely a minimum voltage of the current regulation and a maximum voltage of the current regulation.
- FIG. 2 shows a schematic representation of the treatment plant 100 with exemplary values of current regulation according to one exemplary embodiment of examples disclosed herein.
- the treatment plant 100 is represented in a schematic longitudinal section, the individual electrodes 32 being represented as vertically standing checkered rectangles.
- a transport unit 34 is arranged on a carrier 36 and carries a vehicle body as a workpiece 40 , which is immersed head-first into the dip bath 30 .
- the workpiece 40 moves in a feed direction 42 , which is indicated by the arrow.
- a run-in region 52 and a run-out region 50 and as well as a body region 54 of the treatment plant are marked.
- all the electrodes 32 receive the same voltage value 70 as the setpoint voltage.
- the voltage 70 is in this case regulated so that the desired total current 74 on the busbar 21 is obtained.
- a current setpoint value of 700 A is specified, which is given by the total of the individual current values 75 of the electrodes 32 .
- FIG. 3 shows a schematic representation of the treatment plant 100 with exemplary values of a setpoint value adaptation during voltage regulation in order to weight individual workpiece regions 56 , 58 , 60 according to one exemplary embodiment of examples disclosed herein.
- the voltage setpoint values 71 of the rectifier modules 12 which supply the electrodes 32 that are assigned to these regions 56 , 58 , 60 along the feed direction 42 , may be adapted.
- individual body regions 56 , 58 , 60 may be influenced in a controlled way.
- the voltage in particular body regions 56 , 58 , 60 is increased or decreased in order to influence the layer thickness, for example with a voltage adaptation of at most +/ ⁇ 20%.
- a body region 56 , 58 , 60 may in this case expediently be always greater than the distance between two electrodes.
- Small electrodes 32 for example round electrodes, and as many rectifier modules 12 as possible are favorable for this operating mode, so that the dip bath 30 can be subdivided into many small voltage regions.
- the voltage setpoint values 71 of electrodes 32 assigned to the regions 56 , 58 , 60 may be corrected with correction values 73 for the voltage adaptation, with which values adapted voltage setpoint values 72 are then determined.
- the treatment of the workpiece 40 may be continued and individual regions 56 , 58 , 60 may be treated in a controlled way with higher or lower deposition rates of the coating to be applied.
- FIG. 4 shows a schematic representation of the treatment plant 100 with exemplary values of a setpoint value adaptation during current regulation in order to weight individual workpiece regions 56 , 58 , 60 according to one exemplary embodiment of examples disclosed herein.
- the voltage setpoint values 71 represented in FIG. 4 with a value of xxx V come from the current regulation. These values 71 are adapted accordingly with the correction values 73 .
- the partial currents 75 thereby obtained are listed by way of example and give the specified current setpoint value of 480 A.
- FIG. 5 shows a typical voltage/current profile during the treatment in a treatment plant 100 as represented in FIG. 1 in the case of a charge-regulated operating mode of the method according to one exemplary embodiment of examples disclosed herein.
- charge quantity regulation may ensure that the same charge quantity 76 is always deposited for each body.
- a fluctuation in the paint temperature may, for example, be compensated for automatically by means of a charge quantity regulator, so that all the painted vehicle bodies have a favorable coating outcome. In this way, the paint consumption and the coating quality may be optimized.
- the charge quantity regulation may favorably be activated.
- a charge quantity ⁇ Q still required in order to reach the desired charge setpoint value 80 and a residual coating time ⁇ t until the body starts to be extracted from the paint may be determined.
- the charge quantity 76 delivered by the rectifier modules 12 may thus be kept constant during the coating. In this way, it is possible to ensure that a favorable coating outcome is guaranteed for all the bodies.
- the coating layer thickness may be optimized and kept constant. During the coating, material costs may therefore be saved and quality problems due to defective coating may be avoided.
- the current setpoint value for the charge quantity regulation is determined as a quotient of a charge quantity ⁇ Q still required and a remaining treatment time ⁇ t.
- the voltage 70 , the current 74 resulting therefrom and the charge 76 are plotted as a function of time 84 in FIG. 5 during the treatment in the treatment plant 100 .
- the rectifier modules 12 and the electrodes 32 operated by the latter are operated with voltage regulation until a time point 82 , at which the charge regulation begins.
- the treatment is carried out by means of voltage regulation, by the setpoint voltage of the rectifier modules 12 being increased via an adjustable voltage ramp to a voltage setpoint value 71 .
- the treatment of the workpiece 40 is carried out for a specified time interval by means of voltage regulation, and is then carried out by means of current regulation coupled with charge quantity regulation until a specified charge setpoint value 80 is reached.
- the current 74 initially increases steeply, while the voltage 70 increases moderately. The current 74 then decreases to a medium value since the insulating effect of the paint deposited on the workpiece 40 has an effect.
- the rectifier modules 12 are operated with current regulation according to the determined charge quantity ⁇ Q still remaining for the charge setpoint value 80 , which is intended to be achieved in the time ⁇ t still remaining.
- the charge 76 therefore increases linearly on this section as far as the charge setpoint value 80 .
- the treatment of the workpiece 40 is carried out by means of charge quantity regulation, by regulating the current through the busbar section 22 , 24 , 26 so that a specified charge setpoint value 80 is reached.
- the charge setpoint value for the charge quantity regulation is determined as a quotient of a charge quantity still required and a remaining treatment time.
- the charge setpoint value 80 during the charge quantity regulation may advantageously be adapted by means of adaptive regulation.
- the regulation may, for example, be carried out as a function of treatment parameters.
- the regulation may be carried out as a function of at least one of the following parameters: paint parameters, in particular a solvent content, pH, electrical conductivity and the electrical conductivity of the electrolyte fluid, in particular the anolyte fluid, of the treatment process.
- the charge setpoint value 80 during the charge quantity regulation may, for example, also be adapted as a function of a measured thickness, deposited on the workpiece 40 from the paint, of a coating, in particular a coating comprising paint particles.
- the current supply units 10 of the treatment plant 100 are connected to a computer which implements a computer program product for carrying out the method according to examples disclosed herein for operating the treatment plant 100 for electrophoretic, for example cathodic, dip painting of a metal workpiece 40 , in particular a vehicle body, in a dip bath 30 filled with a paint, in which the workpiece 40 is moved in a feed direction 42 along a busbar 21 and electrodes 32 supplied by rectifier modules 12 , comprising at least one computer-readable storage medium having program code instructions stored thereon, wherein the effect of the program code instructions which can be executed by a data processing system is that, during the residence of the workpiece 40 in the region of action of at least one busbar section 22 , 24 , 26 of the busbar 21 , an electrical current is at least temporarily supplied to the workpiece 40 by the at least one busbar section 22 , 24 , 26 .
- the program code instructions may furthermore advantageously have the effect that the treatment of the workpiece 40 is carried out at least temporarily by means of current regulation, by a current setpoint value being specified fora busbar section 22 , 24 , 26 of the busbar 21 , an equal average voltage setpoint value 71 being specified for the rectifier modules 12 and the voltage being regulated so that the specified current threshold value is reached; and/or that the treatment of the workpiece 40 is carried out by means of charge quantity regulation, by the current through the busbar section 22 , 24 , 26 being regulated in order to reach a specified charge setpoint value 80 ; and/or that the treatment of the workpiece 40 is carried out over a first time interval by means of voltage regulation and in a second time interval by means of current regulation coupled with charge quantity regulation until a specified charge setpoint value 80 is reached; and/or that for controlled treatment of individual regions 56 , 58 , 60 of the workpiece 40 , voltage setpoint values 71 of the rectifier modules 12 , which supply the electrodes 32 in these regions 56 , 58
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Abstract
A disclosed method for operating a treatment system and to a treatment system for electrophoretic dip coating, more particularly dip painting of a metal workpiece, more particularly of a vehicle body, in a dipping tank filled with a paint, wherein: a relative movement between the workpiece and a bus bar is carried out in the dipping tank; a voltage is applied to the workpiece; and, while the workpiece is in the effective range of at least one bus bar portion of the bus bar, electric current is fed to the workpiece from the at least one bus bar portion at least some of the time. Examples disclosed herein also relate to a treatment system and to a computer program product.
Description
- Examples disclosed herein relate to a method for operating a treatment plant for the electrophoretic dip painting of a metal workpiece, in particular a vehicle body, and to a treatment plant and a computer program product for carrying out the method.
- For the treatment of vehicle bodies, electrophoretic dip coating plants, for instance cathodic dip coating plants (CDC plants), are used, in which vehicle bodies are for example pretreated and/or painted by immersing them in dip baths in which paint is applied by means of electrophoresis. Electrophoretic deposition (EPD) is a widespread industrial process in which colloidal particles are deposited on a workpiece as an electrode under the influence of an electric field. The workpiece, for example a vehicle body, is immersed in an electrically conductive aqueous dipping paint and a DC voltage field is applied between the workpiece and a counterelectrode. The basic principle of electrodip painting consists in precipitating water-soluble binders on the surface of the workpiece connected as an electrode, and thus generating a continuous adhering paint film.
- The object of examples disclosed herein is to provide a method for operating a treatment plant for the electrophoretic dip coating of a metal workpiece, in particular a vehicle body, with which a better coating outcome can be achieved.
- A further object consists in providing a treatment plant for electrophoretic dip coating, with which a better coating outcome can be achieved.
- A further object consists in providing a computer program product with which the improved method can be carried out.
- The objects are achieved by the features of the independent claims. Favorable configurations and advantages of examples disclosed herein may be found in the further claims, the description and the drawing.
- The features mentioned individually in the patent claims may be combined with one another in a technologically expedient way and may be supplemented with explanatory facts from the description and by details from the figures, further embodiment variants of examples disclosed herein being presented.
- A method is proposed for operating a treatment plant for electrophoretic dip coating, in particular dip painting, of a metal workpiece, in particular a vehicle body, in a dip bath filled with a paint, wherein a relative movement between the workpiece and a busbar is carried out in the dip bath, wherein an electrical voltage is applied to the workpiece, and wherein during the residence of the workpiece in the region of action of at least one busbar section of the busbar, an electrical current is at least temporarily supplied to the workpiece by the at least one busbar section.
- The busbar is subdivided into individual busbar sections. On each busbar section, there is only ever one body, the length of each busbar section being less than the cycle distance of the successive bodies.
- The current that flows to each busbar section is determined by a corresponding measuring device of a current supply unit. The workpiece is thus respectively arranged during the treatment only in the region of one busbar section. The busbar section may be longer or shorter than the workpiece, although it is expediently always shorter than the cycle distance between the workpieces.
- The electrophoretic dip coating may be cathodic dip coating, in which the workpiece to be coated is connected as a cathode, or anodic dip coating, in which the workpiece to be coated is connected as an anode. During cathodic dip coating, the electrodes are filled with an anolyte as electrolyte fluid. During anodic dip coating, a separate anolyte system is not required as in the case of cathodic dip coating.
- According to a favorable configuration of the method, regulation of the electrical current supplied to the workpiece may be carried out.
- The electrical current for the current regulation may favorably be determined in each busbar section. The current regulation advantageously also allows simple specification of the desired coating current for each busbar section in the case of a current supply unit having modular rectifier modules. In this way, a better coating outcome may be achieved on the treated vehicle body.
- According to a favorable configuration of the method, an electrical voltage may be applied to the workpiece by means of at least two electrically equivalent electrodes arranged in the dip bath in the region of action of the at least one busbar section, at least one rectifier module being connected to at least one of the electrodes, the current supplied to the workpiece forming a sum of the partial currents supplied by the individual rectifier modules, and a jointly regulated voltage setpoint value for the individual rectifier modules in the region of the workpiece being derived from a specified current setpoint value of the total current supplied to the workpiece and being specified to the individual rectifier modules.
- During the electrophoretic dip coating, in particular dip painting, separate rectifier modules may respectively be expediently used for the current supply of the electrically equivalent electrodes. For supply with direct current, each of these rectifier modules may be electrically connected to an electrode or a group of electrodes, or a plurality of rectifier modules may be connected to a common electrode. By the modular structure, the voltage in the dip baths may be controlled or regulated very accurately.
- Conventionally, in a body treatment section, which also corresponds to a busbar section, a plurality of electrodes are used, which may be arranged on both sides of the body in order to achieve a favorable treatment outcome. Typically, for flat or semi-round electrodes, from ten to sixteen electrodes may be provided. In the case of round electrodes, up to forty electrodes may be provided. Depending on the plant, more or fewer electrodes may of course be provided.
- All the rectifier modules have a common pole, in the case of cathodic coating a common negative pole and in the case of anodic coating a common positive pole, which is connected to the bodies via a busbar having individual busbar sections.
- Advantageously, a total current for the treatment of the body may thus be specified and regulated, which is made up of the sum of the individual partial current values of the at least one electrode and of their at least one supplying rectifier module. Particularly in the case of a plurality of rectifier modules, these may be controlled and/or regulated independently of one another. A current-led operating mode of the treatment unit may therefore advantageously be set up and implemented.
- According to a favorable configuration of the method, an equal average voltage setpoint value may be specified for the rectifier modules and the voltage at the rectifier modules may be regulated so that the respectively specified total current setpoint value is reached.
- The body is connected via the busbar to the common pole of the rectifier modules. The flow of current to the busbar is measured and corresponds to the current consumption of the body. The voltage regulation is switched over to current regulation. The average voltage of all the electrodes in the region of a body, without a run-in and run-out of the treatment, may for example be calculated in a PLC program of a control unit and assigned to the currently occupied busbar section.
- During the current regulation, all the electrodes in the treatment region, including the run-in and run-out, receive the same voltage setpoint value.
- The voltage is regulated so that the desired current setpoint value is reached.
- The voltage may in this case vary between two setpoint values, namely a minimum voltage of the current regulation and a maximum voltage of the current regulation.
- According to a favorable configuration of the method, in the case of a plurality of busbar sections following one another in the feed direction, PID regulation may be used for each busbar section, an average voltage of the respectively preceding busbar section being used as a start value for the PID regulation.
- For each busbar section, separate PID regulation may thus be used and adapted according to requirements. As a start value for the regulation, the so-called Y offset value, an average voltage of the preceding busbar section may for example always be adjusted. It is therefore possible to ensure that the voltage is regulated constantly over the entire feed path and voltage jumps can be avoided.
- When extracting the body from the paint of the dip bath, the current regulation is stopped and the electrodes keep their current voltage or a special extraction voltage is applied to them.
- According to a favorable configuration of the method, a lower limit voltage and an upper limit voltage may be specified for the current regulation. The voltage may thus vary during the current regulation between two setpoint values, namely a minimum voltage of the current regulation and a maximum voltage of the current regulation. The voltage is specified and the partial current varies between 0 A and the maximum possible partial current per rectifier module. At the start of the coating, the voltage is increased via an adjustable ramp from 0 V to the desired setpoint value.
- According to a favorable configuration of the method, the treatment of the workpiece may be carried out by means of charge quantity regulation, by regulating the current through the busbar section so that a specified charge setpoint value is reached.
- Since the coating particles to be deposited, in particular paint particles, are applied by means of current transport, the total charge quantity represents a measure of the coating thickness of the coating material deposited, for example the paint deposited.
- Advantageously, charge quantity regulation may ensure that the same charge quantity, i.e. amount of coating material from the paint, is always deposited for each body. A fluctuation in the paint temperature may for example be compensated for automatically by means of a charge quantity regulator, so that all the coated, in particular painted, vehicle bodies have a favorable coating outcome. In this way, the paint consumption and the coating quality may be optimized.
- Beyond an adjustable time point of the coating, the charge quantity regulation may favorably be activated. For this purpose, for example, a charge quantity still required in order to reach the desired charge setpoint value and a residual coating time until the body starts to be extracted from the paint may be determined.
- Advantageously, the charge quantity delivered by the rectifier modules may thus be kept constant during the coating. In this way, it is possible to ensure that a favorable coating outcome is guaranteed for all the bodies.
- By the charge quantity regulation, the coating layer thickness may be optimized and kept constant. During the coating, material costs may therefore be saved and quality problems due to defective coating may be avoided.
- According to a favorable configuration of the method, the current setpoint value for the charge quantity regulation is determined as a quotient of a charge quantity still required and a remaining treatment time.
- As soon as the charge quantity regulation is active, the coating current is regulated. The current setpoint value is calculated continuously in order to reach the desired charge quantity:
-
- current setpoint value=Δ charge/Δ time,
- or with the desired units:
- current setpoint value [A]=charge quantity still required [Amin]×60/remaining coating time [s].
- When the charge quantity regulation is active, the total current through the body is regulated to the calculated setpoint value. The voltage varies automatically between the adjustable minimum and maximum.
- At the end of the coating, the charge reached is checked and compared with the specified limit values. If the limits are exceeded or fallen below, corresponding warning or fault messages may be output.
- According to a favorable configuration of the method, the charge setpoint value may be adapted during the charge quantity regulation by means of adaptive regulation, the regulation being carried out as a function of treatment parameters. In particular, the regulation may be carried out as a function of at least one of the following parameters: paint parameters, in particular a binder content, pigment content, solvent content, pH, electrical conductivity of the electrolyte fluid, in particular the anolyte fluid, of the treatment process. During cathodic dip coating, the electrodes are filled with an anolyte. During anodic dip coating, acid is formed on the workpiece and a separate anolyte system is not required as in the case of cathodic dip coating.
- In a further step, additional parameters may be taken into account. For this purpose, it is possible to use adaptive regulation which adapts automatically to the charge setpoint value of the body by means of external process parameters.
- External parameters may inter alia be the paint parameters, for example binder content, pigment content, solvent content, pH, electrical conductivity and electrical conductivity in the electrolyte fluid, in particular the anolyte fluid. The relationship between these external parameters and the charge consumption may, for example, be stored in a mathematical formula in the PLC program of a control unit of the current supply unit.
- If the pH of the paint lies above a setpoint value, for example, the charge setpoint value may be reduced by a particular charge value. If the pH of the paint lies below the setpoint value, on the other hand, the charge setpoint value may be increased by a particular amount.
- According to a favorable configuration of the method, the charge setpoint value may be adapted during the charge quantity regulation as a function of a measured thickness, deposited from the paint on the workpiece, of a coating, in particular a coating that comprises paint particles.
- Alternatively, the layer thickness of each body may be determined automatically by means of a layer thickness measurement after the electrophoretic coating. If the layer thickness is too high, the charge setpoint value is automatically reduced. If the layer thickness is too low, the charge setpoint value is automatically increased.
- According to a favorable configuration of the method, at a start of the treatment of the workpiece, the treatment may be carried out by means of voltage regulation, by the setpoint voltage of the rectifier modules being increased to a voltage setpoint value via an adjustable voltage ramp.
- In this way, the initial current, which rises very steeply at the start of the treatment, may be regulated favorably. With an increasing coating thickness, when the applied coating, in particular the paint, increasingly has an insulating effect, the current decreases. This value may be adjusted favorably by means of the voltage setpoint value.
- According to a favorable configuration of the method, the treatment of the workpiece may be carried out over a specified time interval by means of voltage regulation, and may then be carried out by means of current regulation coupled with charge quantity regulation until a specified charge setpoint value is reached.
- By means of such a regulation strategy, relatively rapid coating with a first coating thickness may advantageously be achieved by means of the voltage regulation, and this may then be operated further by means of the subsequent charge quantity regulation to the desired coating thickness.
- According to a favorable configuration of the method, for controlled treatment of individual regions of the workpiece, the voltage setpoint values of the rectifier modules, which supply the electrodes that are assigned to these regions along the feed direction, may be adapted.
- By the modular structure of the current supply unit with individual rectifier modules, individual body regions may be influenced in a controlled way. For this purpose, the voltage is increased or reduced in particular body regions in order to influence the layer thickness, for example with a voltage adaptation of at most +/−20%.
- A body region may in this case expediently always be larger than the distance between two electrodes. Favorable for this operating mode are small electrodes, for example round electrodes and as many rectifier units as possible, so that the dip bath may be subdivided into many small voltage regions.
- According to a further aspect of examples disclosed herein, a treatment plant is proposed for the electrophoretic dip coating, in particular dip painting, of a metal workpiece, in particular a vehicle body, in a dip bath filled with a paint, for carrying out a method as described above.
- The treatment plant comprises at least: at least two electrically equivalent electrodes, which in particular are arranged on both sides of the workpiece, a busbar, which is arranged along a feed direction of the workpiece in the dip bath and is subdivided into individual busbar sections, the busbar being electrically connected to the workpiece, and at least one current supply unit having at least one rectifier module, one pole of the at least one rectifier module being electrically connected to at least one of the at least two equivalent electrodes, and the other pole of the at least one rectifier module being electrically connected to the busbar, and the at least two electrically equivalent electrodes applying an electrical voltage to the workpiece.
- The busbar is subdivided into individual busbar sections. On each busbar section, there is respectively only one workpiece, for instance a body, during the treatment, the length of each busbar section being less than the cycle distance of successive bodies. The current that flows to each busbar is determined by means of a corresponding measuring device of a current supply unit. The workpiece is thus respectively arranged during the treatment only in the region of one busbar section, which is shorter than the cycle distance.
- According to a favorable configuration of the treatment plant, the treatment plant may be configured for current regulation of the electrical current supplied to the workpiece.
- The electrical current is determined in each busbar section for the current regulation. The current regulation advantageously allows simple specification of the desired coating current for each busbar section even in the case of a current supply unit having modular rectifier modules. An improved coating outcome on the vehicle body being treated may therefore be achieved.
- According to a favorable configuration of the treatment plant, the at least one current supply unit may be configured to operate the rectifier modules respectively separately by means of voltage regulation.
- The body is connected by means of the busbar to the common pole of the rectifier modules. The flow of current to the busbar is measured and corresponds to the current consumption of the body. The voltage regulation is switched over to current regulation. The average voltage of all the electrodes in the region of a body, without a run-in and run-out of the treatment, may for example be calculated in a PLC program of a control unit and assigned to the currently occupied busbar.
- During the current regulation, all the electrodes in the treatment region, including the run-in and run-out, receive the same voltage setpoint value. The voltage is regulated so that the desired current setpoint value is reached.
- The voltage may in this case vary between two setpoint values, namely a minimum voltage of the current regulation and a maximum voltage of the current regulation.
- According to a favorable configuration of the treatment plant, the at least one current supply unit may be configured to operate the rectifier modules by means of current regulation coupled with charge quantity regulation by means of the current of a busbar section.
- Since the coating particles are applied from the paint by means of current transport, the total charge quantity represents a measure of the coating thickness of the coating applied, in particular the coating comprising paint particles.
- Advantageously, charge quantity regulation may ensure that the same charge quantity is always deposited for each body. A fluctuation in the paint temperature may for example be compensated for automatically by means of a charge quantity regulator, so that all the coated vehicle bodies have a favorable coating outcome. In this way, the paint consumption and the coating quality may be optimized.
- According to a favorable configuration of the treatment plant, the at least one current supply unit may be configured to operate the rectifier modules in a first time interval by means of voltage regulation and in a second time interval by means of current regulation coupled with charge quantity regulation until a specified charge setpoint value is reached.
- Beyond an adjustable time point of the coating, the charge quantity regulation may favorably be activated. For this purpose, for example, a charge quantity still required in order to reach the desired charge setpoint value and a residual coating time until the body starts to be extracted from the paint of the dip bath may be determined.
- Advantageously, the charge quantity delivered by the rectifier modules may thus be kept constant during the coating. In this way, it is possible to ensure that a favorable coating outcome is guaranteed for all the bodies.
- By the charge quantity regulation, the layer thickness deposited may be optimized and kept constant. During the coating, material costs may therefore be saved and quality problems due to defective coating may be avoided.
- By means of such a regulation strategy, relatively rapid coating with a first coating thickness may advantageously be achieved by means of the voltage regulation, and this may then be operated further by means of the subsequent charge quantity regulation to the desired coating thickness.
- According to a further aspect of examples disclosed herein, a computer program product is proposed for carrying out the method according to examples disclosed herein, in order to operate a treatment plant for the electrophoretic dip coating, in particular dip painting, of a metal workpiece, in particular a vehicle body, in a dip bath filled with a paint, in which the workpiece is moved in a feed direction along a busbar and electrodes supplied by rectifier modules. The computer program product comprises at least one computer-readable storage medium having program code instructions stored thereon, wherein the effect of the program code instructions which can be executed by a data processing system is that, during the residence of the workpiece in the region of action of at least one busbar section of the busbar, an electrical current is at least temporarily supplied to the workpiece by the at least one busbar section.
- According to a favorable configuration of the computer program product, the effect of the program code instructions which can be executed by the data processing system may be that, the treatment of the workpiece is carried out at least temporarily by means of current regulation, by a current setpoint value being specified for a busbar section of the busbar, an equal regulated voltage setpoint value being specified for the rectifier modules and the voltage being regulated so that the specified current setpoint value is reached; and/or that the treatment of the workpiece is carried out by means of charge quantity regulation, by the current through the busbar section being regulated in order to reach a specified charge setpoint value; and/or that the treatment of the workpiece is carried out over a first time interval by means of voltage regulation and in a second time interval by means of current regulation coupled with charge quantity regulation until a specified charge setpoint value is reached; and/or that for controlled treatment of individual regions of the workpiece, voltage setpoint values of the rectifier modules, which supply the electrodes in these regions, are adapted.
- Advantageously, a total current for the treatment of the body may thus be specified and regulated, which is made up of the sum of the individual partial current values of the individual electrodes and of their supplying rectifier modules, controlled independently of one another.
- A current-led operating mode of the treatment unit may therefore advantageously be set and implemented.
- Advantageously, the charge quantity delivered by the rectifier modules may thus be kept constant during the coating. In this way, it is possible to ensure that a favorable coating outcome is guaranteed for all the bodies.
- By the charge quantity regulation, the layer thickness deposited may be optimized and kept constant. During the coating, material costs may therefore be saved and quality problems due to defective coating may be avoided.
- Further advantages may be found from the following description of the drawing. Exemplary embodiments of examples disclosed herein are represented in the drawings. The drawings, the description and the claims contain numerous features in combination. A person skilled in the art will also expediently consider the features individually and combine them to form suitable further combinations.
- By way of example:
-
FIG. 1 shows an exemplary embodiment of examples disclosed herein with a treatment plant; -
FIG. 2 shows a schematic representation of the treatment plant with exemplary values of current regulation according to one exemplary embodiment of examples disclosed herein; -
FIG. 3 shows a schematic representation of the treatment plant with exemplary values of a setpoint value adaptation during voltage regulation in order to weight individual workpiece regions according to one exemplary embodiment of examples disclosed herein; -
FIG. 4 shows a schematic representation of the treatment plant with exemplary values of a setpoint value adaptation during current regulation in order to weight individual workpiece regions according to one exemplary embodiment of examples disclosed herein; and -
FIG. 5 shows a typical voltage/current profile during the treatment in the case of a charge-regulated operating mode of the method according to one exemplary embodiment of examples disclosed herein. - The figures merely show examples and are not to be interpreted as restrictive.
- Before examples disclosed herein are described in detail, it should be pointed out that it is not restricted to the respective component parts of the device and the respective method steps, since these component parts and methods may vary. The terms used herein are merely intended to describe particular embodiments and are not used restrictively. Furthermore, when the singular or indefinite article is used in the description or in the claims, this also relates to the plurality of these elements so long as the contrary is not clearly disclosed in the overall context.
- In what follows, direction terminology with terms such as “left”, “right”, “up”, “down”, “before”, “behind”, “after” and the like is used only for better understanding of the figures and is in no case intended to constitute a restriction of generality. The components and elements represented, their layout and their use may vary in the sense of the considerations of a person skilled in the art and be adapted to the respective applications.
-
FIG. 1 shows an exemplary embodiment of examples disclosed herein with atreatment plant 100. - The
treatment plant 100 for the electrophoretic, for example cathodic, dip painting of ametal workpiece 40, in particular a vehicle body, in a dip bath filled with a paint comprises a multiplicity ofelectrodes 32, which in particular are arranged on both sides of theworkpiece 40. A relative movement between the workpiece 40 and abusbar 21 is carried out in thedip bath 30, i.e. with thebusbar 21 stationary the workpiece is moved in thedip bath 30 between the likewisestationary electrodes 32 in thefeed direction 42. - During cathodic dip coating, the
workpiece 40 to be coated is connected as a cathode and the electrodes are filled with an anolyte. - The
treatment plant 100 furthermore comprises abusbar 21, which is arranged along afeed direction 42 of theworkpiece 40 in thedip bath 30 and is subdivided intoindividual busbar sections busbar sections length 46, which may be adapted to alength 44 of theworkpiece 40 in thefeed direction 42. Thebusbar sections workpiece 40, although expediently they are always shorter than the cycle distance. - The
busbar 21 is electrically connected to theworkpiece 40, for example by means of power cables. This, however, is not represented inFIG. 1 . - On each
busbar section busbar section busbar section corresponding measuring device 18 of acurrent supply unit 10. Theworkpiece 40 is thus respectively arranged during the treatment only in the region of onebusbar section workpiece 40. The electrical current is determined in eachbusbar section - The current regulation advantageously allows simple specification of the desired coating current for each
busbar section current supply unit 10 havingmodular rectifier modules 12. An improved coating outcome on the vehicle body being treated may therefore be achieved. - During the electrophoretic dip painting,
separate rectifier modules 12 may respectively expediently be used for the current supply of theelectrodes 32. Each of theserectifier modules 12 supplies anelectrode 32 or a group ofelectrodes 32 with direct current. By the modular structure, the voltage in thedip baths 30 may be controlled very accurately. Alternatively, a plurality ofrectifier modules 12 may also be provided for anelectrode 32. - Conventionally, in a body treatment section, which also corresponds to a
busbar section semi-round electrodes 32 are used, which may be arranged on both sides of the body in order to achieve a favorable treatment outcome. In the case ofround electrodes 32, even more, for instance up to forty, may be provided. More or fewer electrodes may respectively be provided. - All the
rectifier modules 12 have acommon pole 16, which is connected to the bodies via abusbar 21 havingindividual busbar sections common pole 16 is the negative pole, while in the case of an anodic dip coating thecommon pole 16 would be the positive pole. - Advantageously, a total current for the treatment of the body may thus be specified and regulated, which is made up of the sum of the individual partial
current values 75 of theindividual electrodes 32 and of their supplyingrectifier modules 12, which may be controlled independently of one another. A current-led operating mode of thetreatment unit 100 may therefore advantageously be set and implemented. - In the exemplary embodiment of
FIG. 1 , twocurrent supply units 10 have a multiplicity ofrectifier modules 12. In this case, apositive pole 14 of onerectifier module 12 is electrically connected to at least oneelectrode 32. Thenegative poles 16 of all therectifier modules 12 are electrically connected to thebusbar 21. Via theelectrodes 32, which are arranged on both sides of theworkpiece 40 in the paint of thedip bath 30, an electrical voltage may thus be applied to theworkpiece 40. - The
workpiece 40 is respectively arranged only in the region of onebusbar section - The
treatment plant 100 is configured for current regulation of the electrical current supplied to theworkpiece 40. The electrical current may be determined separately in eachbusbar section current measuring units 18. Thenegative pole 16 of therectifier modules 12 is electrically connected to thebusbar sections current measuring units 18, and optionally via acoupling thyristor 28. - Via the
current supply units 10, therectifier modules 12 may respectively be operated separately by means of voltage regulation. - The
rectifier modules 12 may be operated by means of current regulation coupled with charge quantity regulation via the current of abusbar section - The
current supply units 10 are configured to operate therectifier modules 12 in a first time interval by means of voltage regulation and in a second time interval by means of current regulation coupled with charge quantity regulation until a specifiedcharge setpoint value 80 is reached. - According to the method according to examples disclosed herein, during the residence of the
workpiece 40 in the region of action of at least onebusbar section busbar 21, regulation of the electrical current supplied to theworkpiece 40 by the at least onebusbar section - The current supplied to the
workpiece 40 forms the sum of the partial currents supplied by theindividual rectifier modules 12, avoltage setpoint value 71 for therectifier modules 12 in the region of theworkpiece 40 to be coated being derived from a specified current setpoint value of the total current supplied to theworkpiece 40 and specified to theindividual rectifier modules 12. - An equal average voltage setpoint value 71 (represented in
FIG. 2 ) may be specified for therectifier modules 12 and the voltage at therectifier modules 12 may be regulated so that the respectively specified total current of theworkpiece 40 is reached. - In the case of a plurality of
busbar sections feed direction 42, PID regulation may for example be used for eachbusbar section busbar section - A lower limit voltage and an upper limit voltage may be expediently specified for the current regulation.
- For each
busbar section busbar section - When extracting the body from the paint, the current regulation is stopped and the
electrodes 32 keep their current voltage or a special extraction voltage is applied to them. - The body is connected via the
busbar 21 to the commonnegative pole 16 of therectifier modules 12. The flow of current to thebusbar 21 is measured and corresponds to the current consumption of the body. The voltage regulation is switched over to current regulation. The average voltage of all theelectrodes 32 in the region of a body, without a run-in and run-out of the treatment, may for example be calculated in a PLC program of a control unit and assigned to the currently occupiedbusbar section - During the current regulation, all the
electrodes 32 in the treatment region, including the run-in and run-out, receive the samevoltage setpoint value 71. The voltage is regulated so that the desired current setpoint value is reached. - The
voltage 70 may in this case vary between two setpoint values, namely a minimum voltage of the current regulation and a maximum voltage of the current regulation. -
FIG. 2 shows a schematic representation of thetreatment plant 100 with exemplary values of current regulation according to one exemplary embodiment of examples disclosed herein. Thetreatment plant 100 is represented in a schematic longitudinal section, theindividual electrodes 32 being represented as vertically standing checkered rectangles. Atransport unit 34 is arranged on acarrier 36 and carries a vehicle body as aworkpiece 40, which is immersed head-first into thedip bath 30. Theworkpiece 40 moves in afeed direction 42, which is indicated by the arrow. - A run-in
region 52 and a run-out region 50 and as well as abody region 54 of the treatment plant are marked. - During the current regulation with voltage and current values respectively for an electrode pair of
electrodes 32 arranged on both sides of theworkpiece 40, all theelectrodes 32 receive thesame voltage value 70 as the setpoint voltage. Thevoltage 70 is in this case regulated so that the desired total current 74 on thebusbar 21 is obtained. In the exemplary embodiment represented, a current setpoint value of 700 A is specified, which is given by the total of the individualcurrent values 75 of theelectrodes 32. -
FIG. 3 shows a schematic representation of thetreatment plant 100 with exemplary values of a setpoint value adaptation during voltage regulation in order to weightindividual workpiece regions - For controlled treatment of
individual regions workpiece 40, the voltage setpoint values 71 of therectifier modules 12, which supply theelectrodes 32 that are assigned to theseregions feed direction 42, may be adapted. - By the modular construction of the
current supply unit 10 withindividual rectifier modules 12,individual body regions particular body regions - A
body region Small electrodes 32, for example round electrodes, and asmany rectifier modules 12 as possible are favorable for this operating mode, so that thedip bath 30 can be subdivided into many small voltage regions. - For this purpose, the voltage setpoint values 71 of
electrodes 32 assigned to theregions workpiece 40 may be continued andindividual regions - In
FIG. 3 , factors of between −10% and +10% are shown for theindividual regions -
FIG. 4 shows a schematic representation of thetreatment plant 100 with exemplary values of a setpoint value adaptation during current regulation in order to weightindividual workpiece regions - This is based on the same correction values 73 as in the example in
FIG. 3 . In this case, however, instead of the voltage setpoint values 71 of voltage regulation the voltage setpoint values 71 are adapted during current regulation. In this case, voltage values for theindividual electrodes 32 are specified and adapted by the current regulation so that the desired total current is obtained. - The voltage setpoint values 71 represented in
FIG. 4 with a value of xxx V come from the current regulation. Thesevalues 71 are adapted accordingly with the correction values 73. Thepartial currents 75 thereby obtained are listed by way of example and give the specified current setpoint value of 480 A. -
FIG. 5 shows a typical voltage/current profile during the treatment in atreatment plant 100 as represented inFIG. 1 in the case of a charge-regulated operating mode of the method according to one exemplary embodiment of examples disclosed herein. - Advantageously, charge quantity regulation may ensure that the
same charge quantity 76 is always deposited for each body. A fluctuation in the paint temperature may, for example, be compensated for automatically by means of a charge quantity regulator, so that all the painted vehicle bodies have a favorable coating outcome. In this way, the paint consumption and the coating quality may be optimized. - Beyond an
adjustable time point 82 of the coating, the charge quantity regulation may favorably be activated. For this purpose, for example, a charge quantity ΔQ still required in order to reach the desiredcharge setpoint value 80 and a residual coating time Δt until the body starts to be extracted from the paint may be determined. - Advantageously, the
charge quantity 76 delivered by therectifier modules 12 may thus be kept constant during the coating. In this way, it is possible to ensure that a favorable coating outcome is guaranteed for all the bodies. - By the charge quantity regulation, the coating layer thickness may be optimized and kept constant. During the coating, material costs may therefore be saved and quality problems due to defective coating may be avoided.
- According to a favorable configuration of the method, the current setpoint value for the charge quantity regulation is determined as a quotient of a charge quantity ΔQ still required and a remaining treatment time Δt.
- The
voltage 70, the current 74 resulting therefrom and thecharge 76 are plotted as a function oftime 84 inFIG. 5 during the treatment in thetreatment plant 100. - Initially, the
rectifier modules 12 and theelectrodes 32 operated by the latter are operated with voltage regulation until atime point 82, at which the charge regulation begins. - At a start of the treatment of the
workpiece 40, the treatment is carried out by means of voltage regulation, by the setpoint voltage of therectifier modules 12 being increased via an adjustable voltage ramp to avoltage setpoint value 71. - The treatment of the
workpiece 40 is carried out for a specified time interval by means of voltage regulation, and is then carried out by means of current regulation coupled with charge quantity regulation until a specifiedcharge setpoint value 80 is reached. - In the voltage-regulated phase, the current 74 initially increases steeply, while the
voltage 70 increases moderately. The current 74 then decreases to a medium value since the insulating effect of the paint deposited on theworkpiece 40 has an effect. - Beyond the
time point 82 at which the charge regulation is switched, therectifier modules 12 are operated with current regulation according to the determined charge quantity ΔQ still remaining for thecharge setpoint value 80, which is intended to be achieved in the time Δt still remaining. Thecharge 76 therefore increases linearly on this section as far as thecharge setpoint value 80. - The treatment of the
workpiece 40 is carried out by means of charge quantity regulation, by regulating the current through thebusbar section charge setpoint value 80 is reached. - The charge setpoint value for the charge quantity regulation is determined as a quotient of a charge quantity still required and a remaining treatment time.
- The
charge setpoint value 80 during the charge quantity regulation may advantageously be adapted by means of adaptive regulation. The regulation may, for example, be carried out as a function of treatment parameters. In particular, the regulation may be carried out as a function of at least one of the following parameters: paint parameters, in particular a solvent content, pH, electrical conductivity and the electrical conductivity of the electrolyte fluid, in particular the anolyte fluid, of the treatment process. - The
charge setpoint value 80 during the charge quantity regulation may, for example, also be adapted as a function of a measured thickness, deposited on the workpiece 40 from the paint, of a coating, in particular a coating comprising paint particles. - Advantageously, the
current supply units 10 of thetreatment plant 100 are connected to a computer which implements a computer program product for carrying out the method according to examples disclosed herein for operating thetreatment plant 100 for electrophoretic, for example cathodic, dip painting of ametal workpiece 40, in particular a vehicle body, in adip bath 30 filled with a paint, in which theworkpiece 40 is moved in afeed direction 42 along abusbar 21 andelectrodes 32 supplied byrectifier modules 12, comprising at least one computer-readable storage medium having program code instructions stored thereon, wherein the effect of the program code instructions which can be executed by a data processing system is that, during the residence of theworkpiece 40 in the region of action of at least onebusbar section busbar 21, an electrical current is at least temporarily supplied to theworkpiece 40 by the at least onebusbar section - The program code instructions may furthermore advantageously have the effect that the treatment of the
workpiece 40 is carried out at least temporarily by means of current regulation, by a current setpoint value being specifiedfora busbar section busbar 21, an equal averagevoltage setpoint value 71 being specified for therectifier modules 12 and the voltage being regulated so that the specified current threshold value is reached; and/or that the treatment of theworkpiece 40 is carried out by means of charge quantity regulation, by the current through thebusbar section charge setpoint value 80; and/or that the treatment of theworkpiece 40 is carried out over a first time interval by means of voltage regulation and in a second time interval by means of current regulation coupled with charge quantity regulation until a specifiedcharge setpoint value 80 is reached; and/or that for controlled treatment ofindividual regions workpiece 40, voltage setpoint values 71 of therectifier modules 12, which supply theelectrodes 32 in theseregions -
-
- 10 current supply unit
- 12 rectifier module
- 14 positive pole
- 16 negative pole
- 18 current measuring unit
- 20 connecting line
- 21 busbar
- 22 busbar section
- 24 busbar section
- 26 busbar section
- 28 coupling thyristor
- 30 dip bath
- 32 electrode
- 34 transport unit
- 36 carrier
- 40 workpiece
- 42 feed direction
- 44 length of workpiece
- 46 length of busbar
- 50 run-in
- 52 run-out
- 54 body region
- 56 region 1
- 58
region 2 - 60 region 3
- 70 voltage
- 71 voltage setpoint value
- 72 adapted voltage setpoint value
- 73 correction value
- 74 current
- 75 partial current
- 76 charge
- 80 charge setpoint value
- 82 start of charge quantity regulation
- 84 time
- 100 treatment plant
Claims (20)
1. A method for operating a treatment plant for electrophoretic dip coating, in particular dip painting, of a metal workpiece, in particular a vehicle body, in a dip bath having a paint, the method comprising:
causing relative movement between workpiece and a busbar in the dip bath,
applying an electrical voltage to the workpiece, and
supplying an electrical current to the workpiece by at least one busbar section during residence of the workpiece in the region of action of the at least one busbar section of the busbar.
2. The method as defined in claim 1 , further including regulating the electrical current supplied to the workpiece.
3. The method as defined in claim 1 , wherein the electrical voltage is applied to the workpiece by at least two electrically equivalent electrodes arranged in the dip bath in the region of action of the at least one busbar section,
wherein at least one rectifier module is connected to at least one of the electrodes;
wherein the current supplied to the workpiece corresponds to a sum of partial current supplied by the individual rectifier modules, and
wherein a voltage setpoint value for the rectifier modules in the region of the workpiece to be coated is derived from a specified current setpoint value of the total current supplied to the workpiece and is specified to the individual rectifier modules.
4. The method as defined claim 3 , wherein an equal average voltage setpoint value is specified for the rectifier modules and the voltage at the rectifier modules is regulated so that ai specified total current is reached.
5. The method as defined in claim 4 , wherein for a plurality of busbar sections following one another in a feed direction, PID regulation is used for each busbar section, an average voltage of the respectively preceding busbar section being used as a start value for the PID regulation.
6. The method as defined in claim 4 , wherein a lower limit voltage and an upper limit voltage are specified for the current regulation.
7. The method as defined in claim 1 , wherein the treatment of the workpiece is carried out by charge quantity regulation, by regulating the current through the busbar section so that a specified charge setpoint value is reached.
8. The method as defined in claim 7 , wherein the current setpoint value for the charge quantity regulation is determined as a quotient of a charge quantity still required and a remaining treatment time.
9. The method as defined in claim 7 , wherein the charge setpoint value is adapted during the charge quantity regulation by adaptive regulation, the regulation being carried out as a function of treatment parameters, the regulation in particular being carried out as a function of at least one of the following parameters: paint parameters, in particular binder content of the paint, pigment content, solvent content, pH, conductivity or electrical conductivity of an electrolyte fluid, in particular an anolyte fluid, of the treatment.
10. The method as defined in claim 7 , wherein the charge setpoint value is adapted during the charge quantity regulation as a function of a measured thickness, deposited from the paint on the workpiece, of a coating, in particular a coating that includes paint particles.
11. The method as defined in claim 1 , wherein at a start of the treatment of the workpiece, the treatment is carried out by voltage regulation, by a setpoint voltage of rectifier modules being increased to a voltage setpoint value via an adjustable voltage ramp.
12. The method as defined in claim 1 , wherein the treatment of the workpiece is carried out over a specified time interval by voltage regulation, and is then carried out by current regulation coupled with charge quantity regulation until a specified charge setpoint value is reached.
13. The method as defined in claim 1 , wherein for controlled treatment of individual regions of the workpiece, voltage setpoint values of rectifier modules, which supply electrodes that are assigned to these regions along a feed direction, are adapted.
14. A treatment plant for the electrophoretic dip coating, in particular dip painting, of a metal workpiece, in particular a vehicle body, in a dip bath filled with a paint, for carrying out a method as defined in claim 1 , comprising at least
at least two electrically equivalent electrodes, which in particular are arranged on both sides of the workpiece,
a busbar, which is arranged along a feed direction of the workpiece in the dip bath and is subdivided into individual busbar sections, the busbar being electrically connected to the workpiece, and
at least one current supply unit having at least one rectifier module, one pole of the at least one rectifier module being electrically connected to at least one of the at least two equivalent electrodes, and the other pole of the at least one rectifier module being electrically connected to the busbar, and the at least two equivalent electrodes applying an electrical voltage to the workpiece (40).
15. The treatment plant as defined in claim 14 , wherein the treatment plant is configured for current regulation of the electrical current supplied to the workpiece.
16. The treatment plant as defined in claim 14 , wherein the at least one current supply unit is configured to operate the rectifier modules respectively separately by voltage regulation.
17. The treatment plant as defined in claim 14 , wherein the at least one current supply unit is configured to operate the rectifier modules by current regulation coupled with charge quantity regulation by the current of a busbar section.
18. The treatment plant as defined in claim 14 , wherein the at least one current supply unit is configured to operate the rectifier modules in a first time interval by voltage regulation and in a second time interval by current regulation coupled with charge quantity regulation until a specified charge setpoint value is reached.
19. A computer program product for carrying out the method according to claim 1 , in order to operate a treatment plant for the electrophoretic dip coating, in particular dip painting, of a metal workpiece, in particular a vehicle body, in a dip bath filled with a paint, in which the workpiece is moved in a feed direction along a busbar and electrodes supplied by rectifier modules,
comprising at least one computer-readable storage medium having program code instructions stored thereon, wherein an effect of the program code instructions which can be executed by a data processing system is that, during the residence of the workpiece in the region of action of at least one busbar section of the busbar, an electrical current is at least temporarily supplied to the workpiece by the at least one busbar section.
20. The computer program product as defined in claim 19 , wherein the effect of the program code instructions which can be executed by the data processing system is that,
the treatment of the workpiece is carried out at least temporarily by current regulation, by a current setpoint value being specified for a busbar section of the busbar, an equal average voltage setpoint value being specified for the rectifier modules and the voltage being regulated so that a specified current threshold value is reached,
and/or that the treatment of the workpiece is carried out by charge quantity regulation, by the current through the busbar section being supplied to the workpiece to reach a specified charge setpoint value;
and/or that the treatment of the workpiece is carried out over a first time interval by voltage regulation and in a second time interval by current regulation coupled with charge quantity regulation until a specified charge setpoint value is reached,
and/or that for controlled treatment of individual regions of the workpiece, voltage setpoint values of the rectifier modules, which supply the electrodes in these regions, are adapted.
Applications Claiming Priority (3)
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DE102021111415.2 | 2021-05-03 | ||
DE102021111415.2A DE102021111415A1 (en) | 2021-05-03 | 2021-05-03 | METHOD OF OPERATING A TREATMENT PLANT AND TREATMENT PLANT AND COMPUTER PROGRAM PRODUCT |
PCT/DE2022/100318 WO2022233362A1 (en) | 2021-05-03 | 2022-04-29 | Method for operating a treatment system, treatment system, and computer program product |
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US20240141539A1 true US20240141539A1 (en) | 2024-05-02 |
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US18/557,388 Pending US20240141539A1 (en) | 2021-05-03 | 2022-04-29 | Method for operating a treatment system, treatment system, and computer program product |
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US (1) | US20240141539A1 (en) |
EP (1) | EP4334512A1 (en) |
CN (2) | CN115287733A (en) |
DE (2) | DE102021111415A1 (en) |
WO (1) | WO2022233362A1 (en) |
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Publication number | Priority date | Publication date | Assignee | Title |
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DE2935061C2 (en) | 1979-08-30 | 1982-09-09 | Otto Dürr Anlagenbau GmbH, 7000 Stuttgart | System for electrophoretic surface coating |
JPH0768639B2 (en) | 1986-12-10 | 1995-07-26 | トヨタ自動車株式会社 | Electrodeposition coating method |
JP3877442B2 (en) * | 1998-08-24 | 2007-02-07 | デュポン神東・オートモティブ・システムズ株式会社 | Electrodeposition coating method and continuous electrodeposition apparatus |
DE19942556C2 (en) | 1999-09-07 | 2003-04-30 | Eisenmann Kg Maschbau | Elektrotauchlackiervorrichtung |
DE10325656C5 (en) | 2003-06-06 | 2007-12-27 | Eisenmann Anlagenbau Gmbh & Co. Kg | Electrophoretic dip painting system |
DE10326605A1 (en) * | 2003-06-13 | 2005-01-05 | Daimlerchrysler Ag | Operating method for a cathodic paint dipping plant, especially for coating auto bodies, wherein the current between the cathode car body and distributed anodes is temporally controlled during the process to ensure even coating |
DE102004061791A1 (en) | 2004-12-22 | 2006-07-06 | Dürr Systems GmbH | electrocoating |
DE102006044050A1 (en) | 2006-09-20 | 2008-04-03 | Eisenmann Anlagenbau Gmbh & Co. Kg | Process for the electrophoretic coating of workpieces and coating equipment |
DE102007006335A1 (en) | 2007-02-08 | 2007-11-22 | Daimlerchrysler Ag | Motor vehicle`s component e.g. metal structure, corrodibility predicting method, involves providing data that characterizes geometries of component of motor vehicle and reservoir, respectively |
US8313627B2 (en) * | 2008-01-24 | 2012-11-20 | GM Global Technology Operations LLC | Drag through electro-deposition system |
DE102013003377A1 (en) | 2012-03-02 | 2013-09-05 | Basf Coatings Gmbh | Method for electrophoretic coating of workpiece e.g. electrical conductive substrate with electrical dipping varnish, involves performing electrophoretic coating of workpiece according to mode change of separation voltage |
US10947636B2 (en) * | 2017-03-21 | 2021-03-16 | Rockwell Automation Technologies, Inc. | Adjustable AC/DC conversion topology to regulate an isolated DC load with low AC ripple |
-
2021
- 2021-05-03 DE DE102021111415.2A patent/DE102021111415A1/en not_active Withdrawn
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2022
- 2022-04-29 CN CN202210473299.7A patent/CN115287733A/en active Pending
- 2022-04-29 WO PCT/DE2022/100318 patent/WO2022233362A1/en active Application Filing
- 2022-04-29 CN CN202221043753.7U patent/CN219315120U/en active Active
- 2022-04-29 EP EP22722408.6A patent/EP4334512A1/en active Pending
- 2022-04-29 DE DE112022002358.9T patent/DE112022002358A5/en active Pending
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WO2022233362A1 (en) | 2022-11-10 |
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CN115287733A (en) | 2022-11-04 |
CN219315120U (en) | 2023-07-07 |
DE112022002358A5 (en) | 2024-04-04 |
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