EP3576884B1 - Applikationssystem zum beschichten von bauteilen und beschichtungseinrichtung - Google Patents

Applikationssystem zum beschichten von bauteilen und beschichtungseinrichtung Download PDF

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Publication number
EP3576884B1
EP3576884B1 EP18700646.5A EP18700646A EP3576884B1 EP 3576884 B1 EP3576884 B1 EP 3576884B1 EP 18700646 A EP18700646 A EP 18700646A EP 3576884 B1 EP3576884 B1 EP 3576884B1
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EP
European Patent Office
Prior art keywords
coating agent
coating
nozzle
valve
application system
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP18700646.5A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3576884A1 (de
Inventor
Gunter BÖRNER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ABB Schweiz AG
Original Assignee
ABB Schweiz AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ABB Schweiz AG filed Critical ABB Schweiz AG
Priority to EP21201268.6A priority Critical patent/EP3957404A1/de
Publication of EP3576884A1 publication Critical patent/EP3576884A1/de
Application granted granted Critical
Publication of EP3576884B1 publication Critical patent/EP3576884B1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/02—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling time, or sequence, of delivery
    • B05B12/04—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling time, or sequence, of delivery for sequential operation or multiple outlets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
    • B05B13/04—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation
    • B05B13/0447—Installation or apparatus for applying liquid or other fluent material to conveyed separate articles
    • B05B13/0452—Installation or apparatus for applying liquid or other fluent material to conveyed separate articles the conveyed articles being vehicle bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor
    • B41J2/17596—Ink pumps, ink valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
    • B05B15/58—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter preventing deposits, drying-out or blockage by recirculating the fluid to be sprayed from upstream of the discharge opening back to the supplying means

Definitions

  • the invention relates to an application system for coating components according to the preamble of claim 1 and a coating device.
  • a coating device includes a robot on which at least the application device is accommodated.
  • the application device is usually attached to the robot at the so-called Tool Center Point, TCP for short.
  • the DE102014013158 A1 shows a free-jet device for contactless dispensing of liquids onto the surface of a body.
  • the DE 10 2008 053 178 A1 shows a coating device for coating, in particular painting, of motor vehicle body components.
  • the motor vehicle body components to be painted are transported on one through a painting booth, in which the motor vehicle body components are then painted by painting robots.
  • the painting robots have one or more swiveling robot arms and each have an application device on their TCP via a multi-axis robot hand axis.
  • the application device is designed here as a print head that ejects the coating agent from several coating agent nozzles, and the coating agent nozzles of the print head are jointly connected to a coating agent supply line, via which the coating agent to be applied is supplied.
  • Paint by means of such a print head is advantageous if, for example, a vehicle body is to be painted in multiple colors, if different colors are to be applied at different points on the body. Paint with a print head applicator enables sharp-edged painting of different zones on the workpiece, e.g. the body, without further additional precautions, in particular without masking off areas of a different color.
  • the coating material is usually metered by means of a pressure regulator for the coating material.
  • a pressure regulator for the coating material.
  • This dosing by means of a pressure regulator has a number of disadvantages, in particular when painting automobile bodies or body parts in an automobile painting line. Namely, the flow rate of a paint used as a coating material in automotive painting depends on viscosity and pressure.
  • the viscosity of the coating material can differ greatly with different paint materials.
  • Some paint materials used are thixotropic, which means they have a pressure-dependent viscosity. This significant dependency of the viscosity of the coating agent on the type of material and the pressure often leads to non-uniform droplet sizes during coating and thus to great difficulties in ensuring a homogeneous coating.
  • this object is achieved with an application system having the features of claim 1.
  • the object is achieved with a coating device having the features of claim 2.
  • the application system further comprises a pump, by means of which the coating agent to be applied is fed to the coating agent nozzles via the coating agent supply line, and the application system is set up in such a way that the pump operates with a constant flow rate of coating agent during coating, and that the pressure at each nozzle when the valve is opened is the same as when that valve was previously opened.
  • the valve control is set up so that a constant number of nozzle valves of a print head are always open during coating.
  • FIG 1 shows schematically and by way of example a print head 1 for use in an application device according to the invention.
  • the print head 1 is shown here schematically and by way of example as a cuboid structure.
  • it has ten coating agent nozzles 2, which are arranged in a line one behind the other on a narrow side of the print head, the line extending approximately perpendicular to the direction of movement of the application device during coating, see here figure 3 .
  • the arrow D indicates the direction of ejection of the coating agent droplets.
  • FIG figure 2 shows a schematic and exemplary print head 3 with thirty-two coating agent nozzles 4, which are essentially identical in construction to the coating agent nozzles 2 according to FIG figure 1 embodiment shown.
  • a valve 5 is attached to each coating agent nozzle 4 and the coating agent nozzles 4 are connected in common to a coating agent feed line 6 .
  • the valves can be switched with a switching frequency in the range of a few kHz, typically in the range of 3 kHz.
  • left in figure 2 an embodiment is shown in which the coating agent is only supplied from one side, here from above.
  • Right in the figure 2 an embodiment is shown in which the coating agent is supplied from two sides, here from above and below, with the coating agent supply line 6 dividing into an upper and a lower partial arm 7, 8 for this purpose.
  • figure 3 shows a schematic and exemplary embodiment of an application system 9 in which three print heads 10, 11, 12, each with thirty-two coating agent nozzles 13, are lined up in order to increase the coating performance.
  • the direction of movement of the application system 9 during coating is indicated by the arrow P; it can be seen that this runs approximately perpendicular to the line in which the coating agent nozzles 13 in each of the three print heads 10, 11, 12 are arranged.
  • the distance between adjacent coating agent nozzles 13 is denoted by a. This distance cannot be made arbitrarily small for structural reasons.
  • the coating agent nozzles 13 of the three print heads 10, 11, 12 lined up next to one another are offset by an amount of a/3 in each case arranged staggered, as in the in the right part of the figure 3 illustrated detail enlargement of a portion 14 of the coating agent nozzle field is shown.
  • figure 4 12 shows, schematically and by way of example, the operating mode 16 of the coating agent nozzles of a print head, as is customarily used in accordance with the prior art.
  • a print head 15 with six operating fluid nozzles D1-D6 is assumed here for the exemplary explanation.
  • the horizontal bars, with the alternating black and white fields, indicate the switching status of the respective valves when the print head 15 is moved for coating.
  • a dark field indicates that the corresponding valve is open during this time. During this time, a drop of coating agent emerges from the respective nozzle.
  • a bright field indicates that the corresponding valve is closed during this time, during this time no drop of coating agent exits through the corresponding nozzle.
  • all the valves are opened and closed simultaneously. This is often done to get a sharp start and finish line of the coating.
  • a total of eight switching periods T1 - T8 are shown lined up in their chronologically consecutive order.
  • figure 5 shows in partial figure 5a schematically and by way of example an application system 17 with a print head 18 which has thirty-two coating agent nozzles 19, a valve 20 being attached to each coating agent nozzle 19 and assigned to it.
  • a pump 21 which pumps the coating medium through the coating medium supply line 22 to the print head 18 at a constant flow rate.
  • the pump 21 can be designed, for example, as a gear pump or as a piston pump, both types of pumps that can generate a constant flow rate even with varying pressure.
  • the sub-figures 5b -5d show the time curves of the valve position ( Figure 5b ), the flow of coating agent at the nozzle outlet opening of a coating agent nozzle ( Figure 5c , solid line), the flow rate of the coating agent impressed by the pump 21 ( Figure 5c , dashed line) and the pressure at the coating agent nozzle 19 of the print head 18 ( Figure 5d ) during two complete switching periods T1 and T2 and half a switching period T3. If the valves are all closed at the same time, for example in the switching period T1 at time A, the pump 21 continues to pump at a constant flow rate the coating agent into the application system 17.
  • FIG 8 illustrates this solution according to the invention by way of example and by way of example.
  • Subfigure 8a shows, schematically and by way of example, an application system 17 with a print head 18 which has thirty-two coating agent nozzles 19, with a valve 20 being attached to each coating agent nozzle 19 and assigned to it.
  • the coating medium supply line 22 there is a pump 21 which pumps the coating medium through the coating medium supply line 22 to the print head 18 at a constant flow rate.
  • the pump 21 can be designed, for example, as a gear pump or as a piston pump, both types of pumps that can generate a constant flow rate even with varying pressure.
  • Figure 8b 12 shows, schematically and by way of example, the operating mode 26 of the coating agent nozzles of the print head 18 Figure 8a with the thirty-two coating agent nozzles 1-32 according to the inventive solution described here.
  • the horizontal bars with the alternating black and white fields, indicate the switching status of the respective valves when the print head 18 is moved for coating.
  • a dark field indicates that the corresponding valve is open during this time, during which time a drop of coating agent emerges from the respective nozzle.
  • a bright field indicates that the corresponding valve is closed during this time, during this time no drop of coating agent exits through the corresponding nozzle.
  • the valve control ensures that the switching sequence of the valves 20 is set in such a way that a constant number of valves is always open.
  • valves nos. 5, 6, 7, 8, 25, 26, 27, 28 close again, valves nos. 1, 2, 3, 4, 29, 30, 31, 32 remain closed and the eight valves Nos. 9, 10, 11, 12, 21, 22, 23, 24 open.
  • the eight valves 13, 14, 15, 16, 17, 18, 19, 20 The remaining valves remain closed until the end of the second switching period B and the beginning of the third switching period C. After that, this pattern repeats itself.
  • eight valves are always open and 24 valves are closed.
  • the switching scheme ensures that each of the thirty-two valves has opened once within two switching periods.
  • the pump always works with a constant flow rate of the coating agent.
  • figure 8 The procedure shown using one printhead can also be transferred to an application system with multiple printheads.
  • figure 9 1 shows this by way of example using an exemplary operating mode 27 for an application system with three print heads, each of which has thirty-two valves.
  • the horizontal bars with the alternating black or hatched and white fields show the switching status of the respective valves when the print head is moved for coating.
  • a dark or hatched field indicates that the corresponding valve is open during this time, during which time a drop of coating agent emerges from the respective nozzle.
  • a bright field indicates that the corresponding valve is closed during this time, during this time no drop of coating agent exits through the corresponding nozzle.
  • the bars with the fields filled in black to indicate an open valve are assigned to the first print head.
  • the bars with the obliquely hatched fields to indicate an open valve are associated with the second printhead.
  • the Bars with the vertically hatched fields to indicate an open valve are associated with the third print head.
  • eight of the thirty-two valves are always open on each of the three print heads. Since three print heads are operated in parallel, coating medium is ejected from more than eight nozzles in each switching period, namely from sixteen or twenty-four coating medium nozzles, depending on the switching period. Even better layer homogeneity can be achieved in this way.
  • FIG 7 shows how the disadvantageous build-up of an ever-increasing overpressure in the system with the negative effects in terms of a non-uniform droplet size is avoided by the measure according to the invention as described above.
  • Partial figure 7a shows schematically and by way of example an application system 17 with a print head 18 which has thirty-two coating agent nozzles 19, a valve 20 being attached to each coating agent nozzle 19 and assigned to it.
  • the coating medium supply line 22 there is a pump 21 which pumps the coating medium through the coating medium supply line 22 to the print head 18 at a constant flow rate.
  • the pump 21 can be designed, for example, as a gear pump or as a piston pump, both types of pumps that can generate a constant flow rate even with varying pressure.
  • the partial figures 7b -7d show the time curves of the valve position ( Figure 7b ), the flow of coating agent at the nozzle outlet opening of a coating agent nozzle ( Figure 7c , solid line), the flow rate of the coating agent impressed by the pump 21 ( Figure 7c , dashed line) and the pressure at the coating agent nozzle 19 of the print head 18 ( Figure 7d ) during two complete switching periods T1 and T2 and half a switching period T3.
  • the individual nozzle exit openings for the coating material usually have a diameter of approx. 10 ⁇ m to 200 ⁇ m. Due to manufacturing tolerances, wear and tear or deposits, the individual nozzle outlet openings of a print head are not completely identical.
  • Each of the nozzle outlet openings controlled by a valve therefore has a different flow resistance.
  • the print head is moved at a constant speed over the surface to be coated.
  • the material properties, the layer thickness to be achieved and the distance between the outlet openings then result in an average paint flow rate, if paint is the coating agent, or an average coating agent flow rate.
  • V ⁇ m ⁇ ⁇ i.e D v a ⁇ V
  • the switching frequency or the time of a period (from opening of the valve to the next opening) T p and the time T v that the valve is open are empirical values.
  • the aim is for the same quantity of coating material to flow through all nozzle outlet openings on average over time. This can be achieved by opening the individual valves for different lengths of time.
  • the coating material is supplied via a dosing pump, for example, the following applies:
  • a metering pump in a coating device is that the fluidic conditions in the entire application system are independent of the viscosity of the coating agent and therefore parameter values do not have to be set for the coating material used in each case
  • the coating agent pressure or the paint pressure depends on how many valves are open. The fewer valves that are open, the higher the pressure. This means that the time differences between the individual valve switching times are lower than when operating with constant pressure.

Landscapes

  • Coating Apparatus (AREA)
  • Spray Control Apparatus (AREA)
EP18700646.5A 2017-02-01 2018-01-10 Applikationssystem zum beschichten von bauteilen und beschichtungseinrichtung Active EP3576884B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP21201268.6A EP3957404A1 (de) 2017-02-01 2018-01-10 Applikationssystem zum beschichten von bauteilen und beschichtungseinrichtung

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017101937.5A DE102017101937A1 (de) 2017-02-01 2017-02-01 Applikationssystem zum Beschichten von Bauteilen und Beschichtungseinrichtung
PCT/EP2018/050491 WO2018141511A1 (de) 2017-02-01 2018-01-10 Applikationssystem zum beschichten von bauteilen und beschichtungseinrichtung

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP21201268.6A Division-Into EP3957404A1 (de) 2017-02-01 2018-01-10 Applikationssystem zum beschichten von bauteilen und beschichtungseinrichtung
EP21201268.6A Division EP3957404A1 (de) 2017-02-01 2018-01-10 Applikationssystem zum beschichten von bauteilen und beschichtungseinrichtung

Publications (2)

Publication Number Publication Date
EP3576884A1 EP3576884A1 (de) 2019-12-11
EP3576884B1 true EP3576884B1 (de) 2022-03-16

Family

ID=61002997

Family Applications (2)

Application Number Title Priority Date Filing Date
EP18700646.5A Active EP3576884B1 (de) 2017-02-01 2018-01-10 Applikationssystem zum beschichten von bauteilen und beschichtungseinrichtung
EP21201268.6A Pending EP3957404A1 (de) 2017-02-01 2018-01-10 Applikationssystem zum beschichten von bauteilen und beschichtungseinrichtung

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP21201268.6A Pending EP3957404A1 (de) 2017-02-01 2018-01-10 Applikationssystem zum beschichten von bauteilen und beschichtungseinrichtung

Country Status (5)

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US (1) US11524309B2 (zh)
EP (2) EP3576884B1 (zh)
CN (1) CN110248739B (zh)
DE (1) DE102017101937A1 (zh)
WO (1) WO2018141511A1 (zh)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017110316B4 (de) 2017-05-12 2021-02-25 Abb Schweiz Ag Applikationsgerät zum Beschichten von Bauteilen mit einem Beschichtungsmittel
JP2021505380A (ja) 2017-11-30 2021-02-18 アクサルタ コーティング システムズ ゲゼルシャフト ミット ベシュレンクテル ハフツング 高転写効率塗布器を利用して被覆組成物を塗布するシステムおよびその方法
DE102019003844A1 (de) * 2019-06-03 2020-12-03 Burkhard Büstgens Drop-on-Demand Beschichtung von Flächen
JP6979546B1 (ja) * 2021-10-08 2021-12-15 アーベーベー・シュバイツ・アーゲーABB Schweiz AG 塗装装置
CN116594366B (zh) * 2023-07-17 2023-09-19 苏州聚贝机械设计有限公司 一种机械设备的涂抹部件控制系统

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DE102016014956A1 (de) * 2016-12-14 2018-06-14 Dürr Systems Ag Beschichtungseinrichtung und zugehöriges Betriebsverfahren

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US4555719A (en) * 1983-08-19 1985-11-26 Videojet Systems International, Inc. Ink valve for marking systems
US5602575A (en) * 1988-11-05 1997-02-11 Rea Elektronik Gmbh Ink jet writing head
US5618347A (en) * 1995-04-14 1997-04-08 Kimberly-Clark Corporation Apparatus for spraying adhesive
JP2003033687A (ja) * 2001-07-24 2003-02-04 Sekisui House Ltd 塗料供給エアポンプの流量自動制御装置
FI115992B (fi) * 2002-04-19 2005-08-31 Marioff Corp Oy Menetelmä ja laitteisto suihkutuslaitteiston ohjaamiseksi
DE102008053178A1 (de) * 2008-10-24 2010-05-12 Dürr Systems GmbH Beschichtungseinrichtung und zugehöriges Beschichtungsverfahren
JP5488052B2 (ja) * 2010-03-01 2014-05-14 セイコーエプソン株式会社 液体噴射装置
JP5834420B2 (ja) * 2010-08-09 2015-12-24 富士ゼロックス株式会社 流量制御装置、液滴吐出装置及び流量制御プログラム
DE102012005087A1 (de) * 2011-03-28 2012-10-04 Heidelberger Druckmaschinen Aktiengesellschaft Vorrichtung zum Bedrucken von Oberflächen mit mehreren, bewegbaren Druckköpfen
US9616446B2 (en) * 2012-03-22 2017-04-11 Kabushiki Kaisha Yaskawa Denki Application apparatus for applying cohesive material to application target
US8764176B2 (en) * 2012-04-26 2014-07-01 Seiko Epson Corporation Liquid ejecting apparatus
DE102014013158A1 (de) 2014-09-11 2016-03-17 Burkhard Büstgens Freistrahl-Einrichtung
JP6252434B2 (ja) * 2014-10-28 2017-12-27 トヨタ自動車株式会社 間欠塗工装置の弁体制御方法

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DE102016014956A1 (de) * 2016-12-14 2018-06-14 Dürr Systems Ag Beschichtungseinrichtung und zugehöriges Betriebsverfahren
WO2018108562A1 (de) * 2016-12-14 2018-06-21 Dürr Systems Ag Beschichtungseinrichtung und zugehöriges betriebsverfahren

Also Published As

Publication number Publication date
EP3576884A1 (de) 2019-12-11
CN110248739A (zh) 2019-09-17
US11524309B2 (en) 2022-12-13
US20200023396A1 (en) 2020-01-23
EP3957404A1 (de) 2022-02-23
DE102017101937A1 (de) 2018-08-02
WO2018141511A1 (de) 2018-08-09
CN110248739B (zh) 2022-02-11

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