EP0063992A1 - Elektrostatisches Spritzverfahren für kleine längliche Teile gefördert auf einem omega-förmigen Fliessband - Google Patents

Elektrostatisches Spritzverfahren für kleine längliche Teile gefördert auf einem omega-förmigen Fliessband Download PDF

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Publication number
EP0063992A1
EP0063992A1 EP82400663A EP82400663A EP0063992A1 EP 0063992 A1 EP0063992 A1 EP 0063992A1 EP 82400663 A EP82400663 A EP 82400663A EP 82400663 A EP82400663 A EP 82400663A EP 0063992 A1 EP0063992 A1 EP 0063992A1
Authority
EP
European Patent Office
Prior art keywords
axis
parts
bowl
loop
paint
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.)
Ceased
Application number
EP82400663A
Other languages
English (en)
French (fr)
Inventor
Jean Morel
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.)
Sames SA
Original Assignee
Sames SA
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 Sames SA filed Critical Sames SA
Publication of EP0063992A1 publication Critical patent/EP0063992A1/de
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/08—Plant for applying liquids or other fluent materials to objects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/04—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces

Definitions

  • the invention relates to a method of electrostatic painting of parts of small dimensions extended along a main axis, where the parts are passed, in rotation about their axis on a conveyor with an almost closed loop, a bowl projector. rotating being located substantially on the axis of the loop to distribute the paint on the parts.
  • the electrostatic projectors known as rotating bowls emit, from an edge of a member rotating at high speed, on the surface of which paint is deposited, a thin blade of sprayed paint, between two cones of angle at the top very neighbors.
  • the distance between the projector and the parts to be painted is of the order of a few decimeters.
  • the projector is placed with its bowl on the axis of the loop, so that the distance to the parts is constant.
  • the parts describe around the projector the periphery of a cylinder section, limited by two coaxial circles to the loop, described by the two ends of the main axes of the parts.
  • the axis of rotation of the projector bowl makes an angle with the axis of the loop, such that the zone of intersection of the cylinder described by the axis of the parts and the blade of sprayed paint comes to tangent the two limit circles of the section described by the parts .
  • the parts can be coated with paint over their entire length.
  • some parts may have shapes such that a variation in the quantity of paint deposited along the length of the part may be desirable, but it is unfortunately rare that the desired variation corresponds to the variation actually created by the obliquity of the rotation axis.
  • the coating time is limited. If we wanted to modulate the quantities of paint emitted by controlled movement of the projector, as is done for the coating of certain large parts, it would be necessary for the displacement period to be small compared to the coating time, to uniformly affect all the parts. The corresponding orders would be complex, heavy and difficult to adjust.
  • the subject of the invention is a process for electrostatic painting of small parts where the longitudinal distribution of paint is equalized.
  • the invention also relates to a method of electrostatic painting of small parts where the longitudinal distribution of paint can be modulated relatively simply.
  • the invention provides a method of electrostatic painting of parts, extended along a main axis and of small dimensions, according to which the parts are arranged on individual rotary supports of a conveyor comprising an almost closed circular loop of parallel axis. to the axes of rotation of the support so that the parts, while rotating around their axis, describe the lateral surface of a section of cylinder limited by two circles coaxial with the loop, and a paint projector with a bowl rotating at high speed and brought to a high voltage relative to the conveyor emits a thin blade of sprayed paint, blade substantially of revolution around the axis of rotation of the bowl, this bowl being placed substantially on the axis of the loop with its axis of rotation oriented in so that the area of intersection of the spray paint blade and the cylinder described by the axes of the parts is contained between the limit circles of the cylinder section but reaches these limits, process where the projector is equipped with an annular nozzle connected to a source of gas under pressure and arranged behind the bowl so that an annular jet
  • the supply pressure modulation results in a modulation of the cone at the top of the paint slide, which reacts with reduced inertia. Everything happens, on the periphery of the cylinder section, as if the headlamp was driven by an axial reciprocating movement. It will be noted that, in addition to the displacement of the zone of intersection of the cylinder section by the sprayed paint blade, the action of the air jet blown by the nozzle on the paint blade creates turbulences which widen the blade.
  • the supply pressure is modulated by periodically connecting the nozzle to a pressure source. You get all-or-nothing modulation in a remarkably simple way.
  • the nozzle is permanently connected to a pressure source, and periodically to a higher pressure source. We then obtain a modulation by all or little, which, on the one hand allows the projector to be moved back, and on the other hand gives at any time a painting blade enlarged by turbulence.
  • each sectoral fraction defines a fractional intersection zone where the scanning regime is independent of the regime of the other zones. This allows in particular to preferentially cover certain parts of the parts.
  • an electrostatic projector 1 as a whole, with a rotating bowl 12 is arranged substantially on the axis of a loop 20 of a conveyor 2 in its together.
  • the headlamp 1 is brought to a high potential with respect to the mass of the conveyor 2, by a high voltage generator 11, and comprises a turbine enclosed in the body 10 for rapidly rotating the bowl 12 (up to 60,000 revolutions per minute). Paint injected onto the internal surface of the bowl 12, substantially frustoconical, is drawn towards the edge 12a of the bowl, from which it is projected tangentially in the form of a blade of sprayed paint 14.
  • annular nozzle 13 supplied with air under pressure, and having outlet orifices which direct air jets on the external surface of the bowl 12.
  • air jets originally intended especially to avoid spray paint return to the projector body 10 cause a deformation of the blade 14 of spray paint, which changes from a planar shape to a cone shape at an angle with a very open top.
  • Figure 4 there is shown the blade 14, seen by the edge, in planar shape.
  • the transporter 2 has an almost closed circular loop 20, which takes the form of a capital omega. Rollers 21 and 21 'ensure the return of the conveyor from a horizontal path to the loop 20, and thus define the inlet and outlet ends of the loop 20.
  • the conveyor comprises supports for parts, mounted door-to-door. -false parallel to the axis of the loop 20. These part supports, as shown in FIG. 2, have knobs 25 at the rear which come to bear on a rail 26 concentric with the loop 20, so that the parts, in their path along the loop, are rotated around the support axis.
  • the arrangement shown is used for painting small parts compared to the normal distance at which the pieces of the bowl 12 are arranged, this distance corresponding practically to the radius of the loop 20; in addition the parts are extended along a main axis, which will coincide with the axis of the supports, this main axis being understood as the direction of the largest dimension of the part, while the dimensions along directions orthogonal to each other and with l 'main axis are significantly weaker than the large dimension.
  • the axes of the support therefore define a cylinder coaxial with the loop 20, which constitutes its director, and the main axes of the parts will describe a section 22 of this cylinder, limited by two circles 22a and 22b coaxial with the loop 20.
  • the parts will receive the paint sprayed essentially in the zone 15 formed by the intersection of the cylinder section 22 by the blade 14. As shown in FIG. 1 and especially in FIG. 4, the zone 15 comes to tangent on one side the limit circle 22a and the other the limit circle 22b, so that the parts receive paint over their entire length, while their rotation around the main axis ensures the peripheral overlap.
  • the axis of rotation of the bowl 12 is inclined on the axis of the loop 20, as clearly shown in FIG. 4. It is specified that, in the developed, the zone 15 has a sinusoidal shape with amplitudes tangent to the straight lines developed from boundary circles 22a and 22b. Furthermore, the shape of the zone 15 will be little affected by a deformation in the open cone of the blade 14 under the effect of an air blowing by the nozzle 13, insofar as, of course, the bowl 12 will have been moved back on the axis of the loop 20 to maintain the zone 15 between the limit circles 22a and 22b.
  • zone 15 corresponds to the time diagram of scanning of each of the parts by the sprayed paint blade, the amount of developed corresponding to the total time of exposure of the part to the painting. Since the press form is sinusoidal, at least approximately, the scanning speed will cancel out at the ends of the part, to be maximum in the center. Despite the corrections made both by the thickness of the blade 14 and by the returns due to the electrostatic field, the paint deposited on the parts has excess thickness at the ends.
  • Figure 5 illustrates the process by which the invention overcomes the above defect.
  • the headlight body 10 the rotating bowl 12 and the annular nozzle 13, the conveyor loop 20 and the cylinder section 22, described by the main axes of the parts, and included between the circles limits 22a and 22b.
  • the angle made by the loop 20 and rotating bowl 12 axes has been reduced so that the intersection zone of the paint blade and the cylinder section 22 occupies only about half the length. cylinder section along the axis.
  • a first blowing pressure at the nozzle 13 was determined, such that the zone 15 of intersection of the blade 14 with the cylinder section 22 is tangent to the limit circle 22a, then a second blowing pressure at the nozzle 13 , such that the intersection zone 17 of the blade 16 with the section 22 is tangent to the limit circle 22b.
  • the second pressure is less than the first, so that the angle at the top of the conical blade 16 is smaller than that of the conical blade 14.
  • the nozzle 13 is supplied with pressure alternately equal to the first and second pressures determined as explained above, the succession period being short compared to the duration of passage of a part over the loop 20.
  • the pressure diagram is shown in FIG. 7 at line 40, the levels 41 and 42 respectively representing the values of first and second pressures.
  • the strip 122 represents the section of the section 22, the lines 122a and 122b being the respective sections of the boundary circles 22a and 22b.
  • Zone 115 is the development of the intersection zone, alternately 15 and 17, as seen by a piece scrolling on the loop 20. Zone 115 results from the superposition of two harmonic movements, one at the periodicity of scrolling of a part, and the other at the periodicity of alternating succession of the first and second presses. We can clearly see, even without in-depth analysis of the distribution, that the end thicknesses are attenuated, and that the distribution along the length of the part is substantially regular.
  • the diameter of the loop 20 is approximately 0.5 m and the linear speed of the conveyor 2 is 10 meters per minute, so that a part describes the loop in approximately 9 seconds; in addition the part undergoes nine to ten rotations during its passage on the loop, that is to say 1 revolution per second.
  • the diameter of the bowl 12 is approximately 70 mm, and the high voltage supplied by the generator 11 is around 90 kV.
  • the first blowing pressure is approximately 3 bars, and the second of 1 bar, the first pressure pulses lasting 0.25 seconds and succeeding each half-second.
  • a source of pressurized air is connected to the inlet pipe 30.
  • a first reservoir 31 is supplied from the pipe 30, through a first expander 31a (set at the first press).
  • a second analogous reservoir 32 is supplied through a second pressure reducer 32a (set at the second pressure).
  • the second tank 32 is connected to an outlet pipe 36, to which the nozzle 13 will be connected, through a non-return valve 35.
  • the first tank 31 is connected to the outlet pipe 36 through a solenoid valve 33, the control winding 33a receives an appropriate signal via a line 34. It is immediately specified that the valve 33 can also be pneumatically controlled.
  • the amount of paint deposited in the region close to the limit 222a is significantly less than the amount of paint distributed over the rest of the part.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Spray Control Apparatus (AREA)
  • Nozzles (AREA)
EP82400663A 1981-04-17 1982-04-14 Elektrostatisches Spritzverfahren für kleine längliche Teile gefördert auf einem omega-förmigen Fliessband Ceased EP0063992A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8107810 1981-04-17
FR8107810A FR2504033A1 (fr) 1981-04-17 1981-04-17 Procede de peinture electrostatique de petites pieces allongees, portees par un transporteur en omega, avec un projecteur a bol tournant sur l'axe de la boucle d'omega

Publications (1)

Publication Number Publication Date
EP0063992A1 true EP0063992A1 (de) 1982-11-03

Family

ID=9257557

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82400663A Ceased EP0063992A1 (de) 1981-04-17 1982-04-14 Elektrostatisches Spritzverfahren für kleine längliche Teile gefördert auf einem omega-förmigen Fliessband

Country Status (5)

Country Link
US (1) US4481228A (de)
EP (1) EP0063992A1 (de)
JP (1) JPS57190661A (de)
CA (1) CA1170120A (de)
FR (1) FR2504033A1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6736030B2 (en) 2002-10-16 2004-05-18 Mcluen Carl T. Champagne cork remover
US8137463B2 (en) * 2007-12-19 2012-03-20 Applied Materials, Inc. Dual zone gas injection nozzle
US9941100B2 (en) * 2011-12-16 2018-04-10 Taiwan Semiconductor Manufacturing Company, Ltd. Adjustable nozzle for plasma deposition and a method of controlling the adjustable nozzle
JP6046752B2 (ja) * 2013-01-30 2016-12-21 京セラ株式会社 ガスノズルおよびこれを用いたプラズマ装置
US10465288B2 (en) * 2014-08-15 2019-11-05 Applied Materials, Inc. Nozzle for uniform plasma processing
KR102553629B1 (ko) * 2016-06-17 2023-07-11 삼성전자주식회사 플라즈마 처리 장치

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2878143A (en) * 1953-10-12 1959-03-17 Ransburg Electro Coating Corp Electrostatic coating system with a curved article path inclined to produce a constant rate vertical movement of the article
FR2336183A1 (fr) * 1975-12-26 1977-07-22 Marchand Bernard Couronne de compensation d'air et de repulsion pour appareil d'application de peinture liquide par procede electrostatique du type a disque tournant a grande vitesse

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2884341A (en) * 1955-03-07 1959-04-28 Ransburg Electro Coating Corp Electrostatic spray coating method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2878143A (en) * 1953-10-12 1959-03-17 Ransburg Electro Coating Corp Electrostatic coating system with a curved article path inclined to produce a constant rate vertical movement of the article
FR2336183A1 (fr) * 1975-12-26 1977-07-22 Marchand Bernard Couronne de compensation d'air et de repulsion pour appareil d'application de peinture liquide par procede electrostatique du type a disque tournant a grande vitesse

Also Published As

Publication number Publication date
FR2504033B1 (de) 1983-07-01
JPS57190661A (en) 1982-11-24
FR2504033A1 (fr) 1982-10-22
CA1170120A (fr) 1984-07-03
US4481228A (en) 1984-11-06

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Inventor name: MOREL, JEAN