WO2022233362A1 - 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
- Publication number
- WO2022233362A1 WO2022233362A1 PCT/DE2022/100318 DE2022100318W WO2022233362A1 WO 2022233362 A1 WO2022233362 A1 WO 2022233362A1 DE 2022100318 W DE2022100318 W DE 2022100318W WO 2022233362 A1 WO2022233362 A1 WO 2022233362A1
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- WIPO (PCT)
- Prior art keywords
- workpiece
- current
- voltage
- treatment
- busbar
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000004590 computer program Methods 0.000 title claims abstract description 11
- 239000003973 paint Substances 0.000 claims abstract description 43
- 238000003618 dip coating Methods 0.000 claims abstract description 21
- 238000010422 painting Methods 0.000 claims abstract description 11
- 238000000576 coating method Methods 0.000 claims description 66
- 239000011248 coating agent Substances 0.000 claims description 62
- 230000033228 biological regulation Effects 0.000 claims description 60
- 239000004020 conductor Substances 0.000 claims description 28
- 230000001105 regulatory effect Effects 0.000 claims description 25
- 239000007788 liquid Substances 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 8
- 238000007654 immersion Methods 0.000 claims description 7
- 230000001276 controlling effect Effects 0.000 claims description 6
- 239000003792 electrolyte Substances 0.000 claims description 5
- 238000012545 processing Methods 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
- 238000009434 installation Methods 0.000 claims description 3
- 239000000049 pigment Substances 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 230000001419 dependent effect Effects 0.000 claims 1
- 238000007598 dipping method Methods 0.000 abstract 2
- 239000002184 metal Substances 0.000 abstract 1
- 230000002349 favourable effect Effects 0.000 description 24
- 239000010410 layer Substances 0.000 description 9
- 239000000463 material Substances 0.000 description 6
- 238000012937 correction Methods 0.000 description 4
- 230000002950 deficient Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000002203 pretreatment Methods 0.000 description 3
- 238000011217 control strategy Methods 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
- 238000001652 electrophoretic deposition Methods 0.000 description 2
- 239000004922 lacquer Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 230000007423 decrease Effects 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
- 238000004070 electrodeposition Methods 0.000 description 1
- 238000001962 electrophoresis Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 239000003232 water-soluble binding agent Substances 0.000 description 1
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
- C25D13/22—Servicing or operating apparatus or multistep processes
-
- 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
Definitions
- the invention relates to a method for operating a treatment system for the electrophoretic dip coating of a metallic workpiece, in particular a vehicle body, and a treatment system and a computer program product for carrying out the method.
- Electrophoretic dip treatment systems such as cathodic dip treatment systems (KTL systems) are used to treat vehicle bodies, in which vehicle bodies are pretreated and/or painted, for example, by being immersed in dip tanks in which paint is applied by electrophoresis.
- Electrophoretic deposition is a widely used 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 dip paint and a DC voltage field is applied between the workpiece and a counter-electrode.
- the basic principle of electrocoating consists in precipitating water-soluble binders on the surface of the workpiece connected as an electrode and thus creating a closed, adhesive paint film.
- the object of the invention is to create a method for operating a treatment system for the electrophoretic dip coating of a metallic workpiece, in particular a vehicle body, with which a better coating result can be achieved.
- Another object is to create a treatment system for electrophoretic dip coating with which a better coating result can be achieved.
- a further object is to create a computer program product with which the improved method can be carried out.
- a method for operating a treatment system for electrophoretic dip coating, in particular dip painting of a metallic workpiece, in particular a vehicle body, in a dip tank filled with a paint, with a relative movement being carried out between the workpiece and a conductor rail in the dip tank, with a electrical voltage is applied, and wherein when the workpiece is in the effective range of at least one busbar section of the busbar, an electric current is at least temporarily supplied to the workpiece by the at least one busbar section.
- the busbar is divided into individual busbar sections. There is always only one body on each conductor rail section, the length of each conductor rail section being smaller than the pitch of the successive bodies.
- the current that flows to each busbar is determined by a corresponding measuring device of a power supply unit.
- the workpiece is only arranged in the area of one conductor rail section.
- the conductor rail section can be longer or shorter than the workpiece, but is expediently always shorter than the cycle distance between the workpieces.
- Electrophoretic dip coating can be cathodic dip coating, in which the workpiece to be coated is connected as the cathode, or anodic dip coating, in which the workpiece to be coated is connected as the anode.
- cathodic dip coating the electrodes are filled with an anolyte as the electrolyte liquid.
- Anodic dip coating does not require a separate anolyte system like cathodic dip coating.
- the electrical current supplied to the workpiece can be regulated.
- the electrical current for current regulation can be conveniently determined in each conductor rail section.
- the current regulation also advantageously enables the desired coating current for each conductor rail section to be specified in a simple manner in the case of a power supply unit with modular rectifier modules. As a result, a better coating result can be achieved on the treated vehicle body.
- an electrical voltage can be applied to the workpiece via at least two electrodes arranged in the immersion tank in the effective area of the at least one busbar section, with at least one rectifier module being connected to at least one of the electrodes, with the current supplied to the workpiece forms a sum of the partial currents supplied by the individual rectifier modules, and a jointly regulated voltage setpoint for the individual rectifier modules in the area of the workpiece is derived from a specified current setpoint of the total current supplied to the workpiece and is specified for the individual rectifier modules.
- electrophoretic dip coating in particular dip painting
- separate rectifier modules can expediently be used in each case for the power supply of the electrodes which are electrically in the same direction.
- Each of these rectifier modules can be electrically connected to one electrode or a group of electrodes, or several rectifier modules can be connected to a common electrode for supplying direct current. Due to the modular design, the voltage in the dip tank can be controlled or regulated very precisely.
- a plurality of electrodes which can be arranged on both sides of the body in order to achieve a favorable treatment result, are usually used in a treatment section of a body, which also corresponds to a conductor rail section.
- a treatment section of a body which also corresponds to a conductor rail section.
- ten to sixteen electrodes may be provided for flat or semi-circular electrodes.
- Up to forty electrodes can be provided for round electrodes. Depending on the system, more or fewer electrodes can of course be provided.
- All rectifier modules have a common pole, a common negative pole in the case of a cathodic coating and a common positive pole in the case of an anodic coating, which is connected to the bodies via a busbar with individual busbar sections.
- a total current for treating the body can advantageously be specified and regulated, which is made up of the sum of the individual partial current values of the at least one electrode and the at least one rectifier module that supplies it.
- these can be controlled and/or regulated independently of one another.
- a current-controlled mode of operation of the treatment unit can thus advantageously be set and implemented.
- the same average voltage setpoint can be specified for the rectifier modules and the voltage at the rectifier modules can be regulated in such a way that the total current setpoint specified in each case is reached.
- the body is connected to the common pole of the rectifier modules via the conductor rail.
- the current flow to the conductor rail is measured and corresponds to the current consumption of the body. It is switched from voltage regulation to current regulation.
- the average voltage of all electrodes in the area of a body, without pre-treatment and post-treatment, can be calculated, for example, in a PLC program of a control unit and assigned to the currently occupied busbar section.
- all electrodes in the treatment area including pre-run and post-run, receive the same voltage setpoint.
- the voltage is regulated in such a way that the desired current setpoint is achieved.
- the voltage can vary between two desired values, namely a minimum voltage of the current control and a maximum voltage of the current control.
- a PID control can be used for each busbar section in the case of several consecutive busbar sections in the conveying direction, with an average voltage of the respectively preceding busbar section being used as the starting value for the PID controller.
- a separate PID control can be used for each busbar section and adjusted as required. For example, an average voltage of the previous busbar section can always be set as the starting value for the regulation, the so-called Y offset value. This ensures that the tension is constantly regulated over the entire conveyor section and that jumps in tension can be avoided.
- a lower limit voltage and an upper limit voltage can be specified for the current control.
- the voltage can thus vary between two desired 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 coating starts, the voltage is increased from 0 V to the desired setpoint via an adjustable ramp.
- the treatment of the workpiece can be carried out by means of a charge quantity control, in that the current through the conductor rail section is controlled in such a way that a predetermined charge setpoint is reached.
- the total amount of charge represents a measure of the coating thickness of the deposited coating material, for example the deposited paint.
- Charge amount control can advantageously ensure that the same amount of charge, i.e. the amount of coating material from the paint, is always deposited on each body.
- a fluctuation in the paint temperature for example, can be automatically compensated for using a charge quantity regulator, so that all coated, in particular painted, vehicle bodies have a favorable coating result. In this way, paint consumption and coating quality can be optimized.
- the charge quantity control can be advantageously activated. For this purpose, for example, a missing amount of charge to reach the desired charge setpoint, as well as a remaining coating time until the body begins to emerge from the paint, can be determined.
- the amount of charge emitted by the rectifier modules during the coating process can advantageously be kept constant. This ensures that a favorable coating result is guaranteed for all bodies.
- the thickness of the coating layer can be optimized and kept constant by controlling the amount of charge. In this way, material costs can be saved during the coating and quality problems due to defective coating can be avoided.
- the current setpoint for the regulation of the amount of charge can be determined as the quotient of a missing amount of charge and a remaining treatment time.
- the coating current is controlled.
- the current setpoint is continuously calculated to achieve the desired amount of charge:
- the charge quantity control is active, then the total current through the body is controlled to the calculated target value.
- the voltage varies automatically between the adjustable minimum and maximum.
- the charge achieved is checked and compared with the specified limit values. If the limits are exceeded or not reached, corresponding warnings or error messages can be issued.
- the charge set value can be adjusted by means of an adaptive control during the charge amount control, the control taking place as a function of treatment parameters.
- the regulation can take place depending on at least one of the following parameters: paint parameters, in particular a binder content, pigment content, solvent content, pH value, electrical conductivity of the electrolyte liquid, in particular the anolyte liquid of the treatment process.
- paint parameters in particular a binder content, pigment content, solvent content, pH value
- electrical conductivity of the electrolyte liquid in particular the anolyte liquid of the treatment process.
- cathodic dip coating the electrodes are filled with an anolyte. Anodic dip creates acid on the workpiece and does not require a separate anolyte system as with cathodic dip.
- additional parameters can be taken into account.
- an adaptive control can be used, which automatically adjusts the charge target value of the body via external process parameters.
- External parameters can include the paint parameters, such as binder content, pigment content, solvent content, pH value, electrical conductivity and electrical conductivity in the electrolyte liquid, in particular the anolyte liquid.
- the connection between these external parameters and the charge acceptance can be stored, for example, in a mathematical formula in the PLC program of a control unit of the power supply unit.
- the charge target value can be reduced by a specific charge value.
- the charge target can be increased by a certain amount.
- the charge set value can be adjusted in the charge amount control as a function of a measured thickness of a coating deposited from the paint on the workpiece, in particular a coating comprising paint particles.
- the layer thickness of each body can be determined automatically by means of a layer thickness measurement after the electrophoretic coating. If the layer thickness is too high, the charging setpoint is automatically reduced. If the layer thickness is too low, the charging setpoint is automatically increased.
- the treatment when the treatment of the workpiece starts, can be carried out by means of voltage regulation, in that the nominal voltage of the rectifier modules is increased to a nominal voltage value via an adjustable voltage ramp.
- the initial current which rises very steeply at the beginning of the treatment, can be conveniently regulated.
- the current decreases with increasing coating thickness, when the applied coating, in particular the lacquer, has an increasingly insulating effect.
- This value can be conveniently set via the voltage setpoint.
- the treatment of the workpiece can be carried out over a predetermined time interval by means of a voltage regulation and then by means of a current regulation coupled with a charge amount regulation until a predetermined charge setpoint is reached.
- a relatively quick coating with a first coating thickness can advantageously be achieved via the voltage control, which can then be further operated via the subsequent charge amount control up to the desired coating thickness.
- the voltage setpoints of the rectifier modules that supply the electrodes that are assigned to these areas along the conveying direction can be adjusted for the targeted treatment of individual areas of the workpiece.
- individual body areas can be specifically influenced.
- the tension in certain areas of the body is increased or reduced in order to influence the layer thickness, for example with a maximum tension adjustment of +/- 20%.
- a body area can expediently always be larger than the distance between two electrodes.
- Small electrodes such as round electrodes and as many rectifier modules as possible are favorable for this mode of operation, so that the immersion tank can be divided into many small voltage ranges.
- a treatment system for electrophoretic dip coating, in particular dip painting, of a metallic workpiece, in particular a vehicle body, in a dip tank filled with paint is proposed for carrying out a method as described above.
- the treatment system comprises at least: at least two electrically identical electrodes, which are arranged in particular on both sides of the workpiece, a busbar, which is arranged along a conveying direction of the workpiece in the immersion tank and is divided into individual busbar sections, the busbar being electrically connected to the workpiece, and at least one power supply unit with 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 electrodes in the same direction, and the other pole of the at least one rectifier module being electrically connected to the busbar and the at least two electrodes in the same direction being electrically connected Apply an electrical voltage to the workpiece.
- the busbar is divided into individual busbar sections. Only one workpiece, for example a body, is located on each conductor rail section during the treatment, with the length of each conductor rail section being smaller than the cycle distance of the successive bodies.
- the current that flows to each busbar is determined by a corresponding measuring device of a power supply unit. During the treatment, the workpiece is only arranged in the area of a busbar section that is shorter than the cycle distance.
- the treatment system can be designed to regulate the current of the electrical current supplied to the workpiece.
- the electrical current is determined for current regulation in each busbar section.
- the current regulation also advantageously enables the desired coating current for each conductor rail section to be specified in a simple manner in the case of a power supply unit with modular rectifier modules. As a result, a better coating result can be achieved on the treated vehicle body.
- the at least one power supply unit can be designed to operate the rectifier modules separately by means of voltage regulation.
- the body is connected to the common pole of the rectifier modules via the conductor rail.
- the current flow to the conductor rail is measured and corresponds to the current consumption of the body. It is switched from voltage regulation to current regulation.
- the average voltage of all electrodes in the area of a body, without pre-treatment and post-treatment, can be calculated in a PLC program of a control unit, for example, and assigned to the currently occupied busbar.
- all electrodes in the treatment area including pre-run and post-run, receive the same voltage setpoint.
- the voltage is regulated in such a way that the desired current setpoint is achieved.
- the voltage can vary between two desired values, namely a minimum voltage of the current control and a maximum voltage of the current control.
- the at least one power supply unit can be designed to operate the rectifier modules by means of a current control coupled with a charge amount control via the current of a busbar section.
- the total amount of charge represents a measure of the coating thickness of the applied coating, in particular the coating comprising paint particles.
- a charge quantity control can advantageously ensure that the same charge quantity is always deposited on each body.
- a fluctuation in the paint temperature, for example, can be automatically compensated for using a charge quantity controller, so that all coated vehicle bodies have a favorable coating result. In this way, paint consumption and coating quality can be optimized.
- the at least one power supply unit can be designed 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 predetermined charge setpoint is reached.
- the charge quantity control can be advantageously activated. For this purpose, for example, a missing amount of charge to reach the desired charge setpoint, as well as a remaining coating time until the body begins to emerge from the paint of the dip tank, can be determined.
- the amount of charge emitted by the rectifier modules during the coating process can advantageously be kept constant. This ensures that a favorable coating result is guaranteed for all bodies.
- the deposited layer thickness can be optimized and kept constant by controlling the amount of charge. In this way, material costs can be saved during the coating and quality problems due to defective coating can be avoided.
- a relatively quick coating with a first coating thickness can advantageously be achieved via the voltage control, which can then be further operated via the subsequent charge amount control up to the desired coating thickness.
- a computer program product is proposed for carrying out the method according to the invention for operating a treatment system for electrophoretic dip coating, in particular dip painting, of a metallic workpiece, in particular a vehicle body, in a dip tank filled with paint, in which the workpiece is conveyed in a conveying direction along a Busbar and powered by rectifier modules electrodes is moved.
- the computer program product comprises at least one computer-readable storage medium with program code instructions stored thereon, the program code instructions executable by a data processing system causing an electric current to be supplied at least temporarily to the workpiece from the at least one busbar section when the workpiece is in the effective range of at least one busbar section of the busbar.
- the program code instructions that can be executed by the data processing system can cause the treatment of the workpiece to be carried out at least temporarily by means of current regulation, in that a current setpoint is specified for a busbar section of the busbar, with an identical regulated voltage setpoint being specified for the rectifier modules and the voltage is regulated in such a way that the specified current setpoint is reached; and/or that the treatment of the workpiece is carried out by means of a charge quantity control, in that the current through the busbar section is controlled in order to achieve a predetermined charge setpoint; and/or that the treatment of the workpiece is carried out over a first time interval by means of a voltage regulation, and is carried out in a second time interval by means of a current regulation coupled with a charge quantity regulation until a predetermined charge setpoint is reached; and/or that for the purposeful treatment of individual areas of the workpiece, voltage reference values of the rectifier modules, which supply the electrodes in these areas, are adjusted.
- a total current for treating the body can advantageously be specified and regulated, which is made up of the sum of the individual partial current values of the individual electrodes and their supplying rectifier modules, which are controlled independently of one another.
- a current-controlled mode of operation of the treatment unit can thus advantageously be set and implemented.
- the amount of charge emitted by the rectifier modules during the coating process can advantageously be kept constant. This ensures that a favorable coating result is guaranteed for all bodies.
- the deposited layer thickness can be optimized and kept constant by controlling the amount of charge. In this way, material costs can be saved during the coating and quality problems due to defective coating can be avoided.
- FIG. 1 shows an embodiment of the invention with a treatment plant
- FIG. 2 shows a schematic representation of the treatment plant with exemplary values of a current regulation according to a
- FIG. 3 shows a schematic representation of the treatment plant with exemplary values of a target value adjustment in a
- FIG. 4 shows a schematic representation of the treatment plant with exemplary values of a target value adjustment in a
- Figure 1 shows an embodiment of the invention with a treatment system 100.
- the treatment system 100 for the electrophoretic, for example cathodic, dip painting of a metallic workpiece 40, in particular a vehicle body, in a dip tank 30 filled with a paint comprises a multiplicity of electrodes 32 which are arranged in particular on both sides of the workpiece 40.
- a relative movement is carried out between the workpiece 40 and a busbar 21, ie when the busbar 21 is stationary, the workpiece is moved in the dip tank 30 in the conveying direction 42 between the likewise stationary electrodes 32.
- cathodic dip coating the workpiece 40 to be coated is connected as a cathode and the electrodes are filled with an anolyte.
- the treatment system 100 also includes a conductor rail 21 which is arranged in the immersion tank 30 along a conveying direction 42 of the workpiece 40 and is divided into individual conductor rail sections 22 , 24 , 26 .
- Busbar sections 22, 24, 26 have a length 46 which can be adapted to a length 44 of the workpiece 40 in the conveying direction 42.
- the conductor rail sections 22, 24, 26 can be of the same length, but also longer or shorter than the workpiece 40, but expediently always be shorter than the pitch.
- the busbar 21 is electrically connected to the workpiece 40, for example via power cables. However, this is not shown in FIG.
- each conductor rail section 22, 24, 26 There is always only one body on each conductor rail section 22, 24, 26, the length of each conductor rail section 22, 24, 26 being smaller than the pitch of the successive bodies.
- the current that flows to each busbar section 22, 24, 26 is determined via a corresponding measuring device 18 of the power supply unit 10.
- the workpiece 40 is only arranged in the area of a conductor rail section 22, 24, 26, which corresponds to a length of the workpiece 40, for example.
- the electrical current is determined in each busbar section 22, 24, 26 for current regulation.
- the current regulation also advantageously enables the desired coating current for each busbar section 22, 24, 26 to be specified in a power supply unit 10 with modular rectifier modules 12. This allows a better coating result to be achieved on the treated vehicle body.
- rectifier modules 12 can expediently be used in each case for the power supply to the electrodes 32 .
- Each of these rectifier modules 12 supplies an electrode 32 or a group of electrodes 32 with direct current. Due to the modular structure, the voltage in the dip tank 30 can be controlled very precisely.
- multiple rectifier modules 12 can also be provided for one electrode 32 .
- a treatment section of a body which also corresponds to a busbar section 22, 24, 26, ten to sixteen flat or semicircular electrodes 32 are usually used, which can be arranged on both sides of the body in order to achieve a favorable treatment result.
- more, for example up to forty can also be provided. More or fewer electrodes can also be provided in each case
- All rectifier modules 12 have a common pole 16 which is connected to the bodies via a busbar 21 with individual busbar sections 22, 24, 26. With a cathodic dip coating the common pole 16 is the negative pole, with an anodic dip coating the common pole 16 would be the positive pole.
- a total current for treating the body can advantageously be specified and regulated, which is made up of the sum of the individual partial current values 75 of the individual electrodes 32 and their supplying rectifier modules 12, which are controlled independently of one another.
- a current-controlled mode of operation of the treatment unit 100 can thus advantageously be set and implemented.
- two power supply units 10 have a large number of rectifier modules 12 .
- a positive pole 14 of a rectifier module 12 is electrically connected to at least one electrode 32 .
- the negative poles 16 of all rectifier modules 12 are electrically connected to the busbar 21 .
- An electrical voltage can thus be applied to the workpiece 40 via the electrodes 32, which are arranged on both sides of the workpiece 40 in the paint of the dip tank 30.
- the workpiece 40 is only arranged in the region of one conductor rail section 22, 24, 26.
- the treatment system 100 is designed to regulate the current of the electrical current supplied to the workpiece 40 .
- the electrical current can be determined separately via current measuring units 18 in each busbar section 22, 24, 26.
- the negative pole 16 of the rectifier module 12 is electrically connected to the busbar sections 22 , 24 , 26 via the current measuring units 18 and optionally a coupling thyristor 28 .
- the rectifier modules 12 can each be operated separately by means of voltage regulation via the power supply units 10 .
- the rectifier modules 12 can be operated via the current of a busbar section 22, 24, 26 by means of a current control coupled with a charge amount control.
- the power supply units 10 are designed 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 amount regulation until a predetermined charge setpoint 80 is reached.
- the electrical current supplied to workpiece 40 by the at least one busbar section 22, 24, 26 is regulated at least temporarily.
- the current supplied to workpiece 40 forms the sum of the partial currents supplied by the individual rectifier modules 12, a setpoint voltage value 71 for the rectifier modules 12 in the area of the workpiece 40 to be coated being derived from a specified setpoint current value of the total current supplied to the workpiece 40 and specified for the individual rectifier modules 12 becomes.
- the same average voltage setpoint 71 (shown in FIG. 2) can be specified for the rectifier modules 12 and the voltage at the rectifier modules 12 can be regulated in such a way that the total current of the workpiece 40 specified in each case is reached.
- Busbar section 22, 24, 26 PID control can be used, with an average voltage of the respective preceding busbar section 22, 24, 26 being able to be used as the starting value for the PID control.
- a lower limit voltage and an upper limit voltage can advantageously be specified for the current control.
- a separate PID control can thus be used for each busbar section 22, 24, 26.
- an average voltage of the previous busbar section 22, 24, 26 can always be set as the starting value for the regulation, the so-called Y offset value. This ensures that the tension is constantly regulated over the entire conveyor section and that there are no jumps in tension.
- the current regulation is stopped and the electrodes 32 retain their current voltage or are subjected to a special replacement voltage.
- the body is connected to the common negative pole 16 of the rectifier modules 12 via the conductor rail 21 .
- the current flow to the conductor rail 21 is measured and corresponds to the current consumption of the body. It is switched from voltage regulation to current regulation.
- the average voltage of all electrodes 32 in the area of a body, without pre-treatment and post-treatment, can be calculated, for example, in a PLC program of a control unit and assigned to the current rail section 22, 24, 26 that is currently occupied.
- all electrodes 32 in the treatment area including the pre-run and post-run, receive the same desired voltage value 71.
- the voltage is regulated in such a way that the desired desired current value is reached.
- the voltage 70 can vary between two desired values, namely a minimum voltage of the current control and a maximum voltage of the current control.
- FIG. 2 shows a schematic representation of the treatment system 100 with exemplary values of a current control according to an exemplary embodiment of the invention.
- the treatment system 100 is shown in a schematic longitudinal section, with the individual electrodes 32 being shown as vertical checkered rectangles.
- a transport unit 34 is arranged on a carrier 36 and carries a vehicle body as a workpiece 40, which is placed upside down in the plunge pool 30 is submerged.
- the workpiece 40 moves in the conveying direction 42, indicated by the arrow.
- a pre-carriage area 52 and a post-carriage area 50 as well as a body area 54 of the treatment plant are marked.
- all electrodes 32 receive the same voltage value 70 as setpoint voltage.
- the voltage 70 is regulated in such a way that the desired total current 74 on the busbar 21 results.
- a desired current value of 700 A is specified, which results from the sum of the individual current values 75 of the electrodes 32 .
- FIG. 3 shows a schematic representation of the treatment system 100 with exemplary values of a setpoint adjustment for voltage regulation for weighting individual workpiece regions 56, 58, 60 according to a
- the voltage setpoints 71 of the rectifier modules 12, which supply the electrodes 32 that are assigned to these areas 56, 58, 60 along the conveying direction 42, can be adjusted.
- individual body areas 56, 58, 60 can be influenced in a targeted manner.
- the voltage is increased or decreased in specific body areas 56, 58, 60 in order to influence the layer thickness, for example with a maximum voltage adjustment of +/-20%.
- a body area 56, 58, 60 can expediently always be larger 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 mode of operation, so that the dip tank 30 can be divided into many small voltage ranges.
- the desired voltage values 71 from the electrodes 32 assigned to the areas 56, 58, 60 can be combined with correction values 73 for voltage adjustment be corrected, with which adapted voltage setpoints 72 are then determined. With these adjusted desired voltage values 72, the treatment of the workpiece 40 can be continued and individual areas 56, 58, 60 can be treated in a targeted manner with higher or lower deposition rates of the coating to be applied.
- FIG. 4 shows a schematic representation of the treatment system 100 with exemplary values of a setpoint adjustment in the case of current regulation for weighting individual workpiece regions 56, 58, 60 according to an exemplary embodiment of the invention.
- the desired voltage values 71 shown in FIG. 4 with a value xxx V come from the current control. These values 71 are adjusted accordingly with the correction values 73 .
- the partial currents 75 achieved in this way are listed as examples and result in the specified current setpoint of 480 A.
- FIG. 5 shows a typical voltage/current curve during the treatment in a treatment installation 100 as shown in FIG. 1 in a charge-regulated mode of operation of the method according to an exemplary embodiment of the invention.
- a charge quantity control can advantageously ensure that the same charge quantity 76 is always deposited on each body.
- a fluctuation in the paint temperature for example, can be automatically compensated for using a charge quantity controller, so that all painted Vehicle bodies have a favorable coating result. In this way, paint consumption and coating quality can be optimized.
- the charge quantity control can be advantageously activated. For this purpose, for example, a missing charge quantity ⁇ Q to reach the desired charge setpoint 80 and a remaining coating time ⁇ t until the body begins to emerge from the paint can be determined.
- the quantity of charge 76 emitted by the rectifier modules 12 during the coating process can advantageously be kept constant. This ensures that a favorable coating result is guaranteed for all bodies.
- the thickness of the paint layer can be optimized and kept constant by controlling the amount of charge. In this way, material costs can be saved during the coating and quality problems due to defective coating can be avoided.
- the current setpoint for the charge quantity control can be determined as the quotient of a missing charge quantity ⁇ Q and a remaining treatment time ⁇ t.
- the voltage 70, the resulting current 74 and the charge 76 are plotted in Figure 5 as a function of the time 84 during the treatment in the treatment system 100.
- the rectifier modules 12 and the electrodes 32 operated with them are operated with voltage control until a point in time 82 at which charge control occurs.
- the treatment is carried out by means of voltage regulation, in that the nominal voltage of the rectifier modules 12 is increased to a nominal voltage value 71 via an adjustable voltage ramp.
- the treatment of the workpiece 40 is performed for a predetermined time interval by means of a voltage control, and thereafter by a Current control coupled with a charge amount control performed until a predetermined charge setpoint 80 is reached.
- the current 74 increases steeply at first, while the voltage 70 increases moderately. The current 74 then drops again to an average value since the insulating effect of the lacquer deposited on the workpiece 40 occurs.
- the rectifier modules 12 are operated in a current-controlled manner according to the determined charge quantity ⁇ Q that is still missing at the charge setpoint 80, which is to be reached in the time ⁇ t still available.
- the charge 76 therefore increases linearly in this section up to the charge setpoint 80.
- the treatment of the workpiece 40 is carried out by means of a charge quantity control, in that the current through the busbar section 22, 24, 26 is controlled in such a way that a predetermined charge setpoint 80 is reached.
- the desired current value for charge quantity control is determined as the quotient of a missing charge quantity and a remaining treatment time.
- the charge setpoint 80 in the charge amount control can advantageously be adjusted by means of an adaptive control.
- the regulation can take place depending on treatment parameters, for example.
- the regulation can take place depending on at least one of the following parameters: paint parameters, in particular a solvent content, pH value, electrical conductivity and the electrical conductivity of the electrolyte liquid, in particular the anolyte liquid of the treatment process.
- the charge set value 80 in the charge quantity regulation can also be adjusted, for example, as a function of a measured thickness of a coating deposited from the paint on the workpiece 40, in particular a coating comprising paint particles.
- the power supply units 10 of the treatment system 100 are advantageously connected to a computer which executes a computer program product for carrying out the method according to the invention for operating the treatment system 100 for electrophoretic, for example cathodic Dip painting of a metallic workpiece 40, in particular a vehicle body, in a dip tank 30 filled with a paint, in which the workpiece 40 is moved in a conveying direction 42 along a conductor rail 21 and electrodes 32 supplied by rectifier modules 12, comprising at least one computer-readable storage medium with program code instructions stored thereon , wherein the program code instructions executable by a data processing system have the effect that when workpiece 40 is in the effective range of at least one busbar section 22, 24, 26 of busbar 21, an electric current is at least temporarily supplied to workpiece 40 from the at least one busbar section 22, 24, 26.
- the program code instructions can advantageously cause the treatment of workpiece 40 to be carried out at least temporarily by means of current regulation, in that a current setpoint is specified for a busbar section 22, 24, 26 of busbar 21, with an identical average voltage setpoint 71 being specified for rectifier modules 12 and the voltage is regulated in such a way that the predetermined desired current value is achieved; and/or that the treatment of the workpiece 40 is carried out by means of a charge quantity control, in that the current through the busbar section 22, 24, 26 is controlled in order to achieve a predetermined charge setpoint 80; and/or that the treatment of the workpiece 40 is carried out over a first time interval by means of a voltage regulation, and is carried out in a second time interval by means of a current regulation coupled with a charge quantity regulation until a predetermined charge setpoint 80 is reached; and/or that for the targeted treatment of individual areas 56, 58, 60 of the workpiece 40, voltage setpoints 71 of the rectifier modules 12, which supply the electrodes 32 in these areas 56, 58, 60, are adjusted
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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US18/557,388 US20240141539A1 (en) | 2021-05-03 | 2022-04-29 | Method for operating a treatment system, treatment system, and computer program product |
DE112022002358.9T DE112022002358A5 (en) | 2021-05-03 | 2022-04-29 | METHOD FOR OPERATING A TREATMENT PLANT AS WELL AS TREATMENT PLANT AND COMPUTER PROGRAM PRODUCT |
EP22722408.6A EP4334512A1 (en) | 2021-05-03 | 2022-04-29 | Method for operating a treatment system, treatment system, and computer program product |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE102021111415.2A DE102021111415A1 (en) | 2021-05-03 | 2021-05-03 | METHOD OF OPERATING A TREATMENT PLANT AND TREATMENT PLANT AND COMPUTER PROGRAM PRODUCT |
DE102021111415.2 | 2021-05-03 |
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WO2022233362A1 true WO2022233362A1 (en) | 2022-11-10 |
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Application Number | Title | Priority Date | Filing Date |
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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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Country | Link |
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US (1) | US20240141539A1 (en) |
EP (1) | EP4334512A1 (en) |
CN (2) | CN115287733A (en) |
DE (2) | DE102021111415A1 (en) |
WO (1) | WO2022233362A1 (en) |
Citations (5)
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JP2000064096A (en) * | 1998-08-24 | 2000-02-29 | Shinto Haabaatsu Automotive Systems Kk | Electrodeposition coating and continuous electrodeposition device |
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 |
US20090188797A1 (en) * | 2008-01-24 | 2009-07-30 | Gm Global Technology Operations, Inc. | 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 |
EP3379708A1 (en) * | 2017-03-21 | 2018-09-26 | Rockwell Automation Technologies, Inc. | Adjustable ac/dc conversion topology to regulate an isolated dc load with low ac ripple |
Family Cites Families (7)
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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 |
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 |
DE202004021146U1 (en) | 2004-12-22 | 2006-12-21 | Dürr Systems GmbH | Electrodip coating plant comprises current control units that move through the plant together with the workpieces and provide an output voltage for the workpieces |
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 |
-
2021
- 2021-05-03 DE DE102021111415.2A patent/DE102021111415A1/en not_active Withdrawn
-
2022
- 2022-04-29 DE DE112022002358.9T patent/DE112022002358A5/en active Pending
- 2022-04-29 WO PCT/DE2022/100318 patent/WO2022233362A1/en active Application Filing
- 2022-04-29 US US18/557,388 patent/US20240141539A1/en active Pending
- 2022-04-29 CN CN202210473299.7A patent/CN115287733A/en active Pending
- 2022-04-29 CN CN202221043753.7U patent/CN219315120U/en active Active
- 2022-04-29 EP EP22722408.6A patent/EP4334512A1/en active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000064096A (en) * | 1998-08-24 | 2000-02-29 | Shinto Haabaatsu Automotive Systems Kk | Electrodeposition coating and continuous electrodeposition device |
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 |
US20090188797A1 (en) * | 2008-01-24 | 2009-07-30 | Gm Global Technology Operations, Inc. | 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 |
EP3379708A1 (en) * | 2017-03-21 | 2018-09-26 | Rockwell Automation Technologies, Inc. | Adjustable ac/dc conversion topology to regulate an isolated dc load with low ac ripple |
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US20240141539A1 (en) | 2024-05-02 |
CN219315120U (en) | 2023-07-07 |
CN115287733A (en) | 2022-11-04 |
DE102021111415A1 (en) | 2022-11-03 |
EP4334512A1 (en) | 2024-03-13 |
DE112022002358A5 (en) | 2024-04-04 |
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