EP1843874A1 - Vorrichtung und verfahren zum reinigen, aktivieren oder vorbehandeln von werkstücken mittels kohlendioxidschnee-strahlen - Google Patents
Vorrichtung und verfahren zum reinigen, aktivieren oder vorbehandeln von werkstücken mittels kohlendioxidschnee-strahlenInfo
- Publication number
- EP1843874A1 EP1843874A1 EP05822749A EP05822749A EP1843874A1 EP 1843874 A1 EP1843874 A1 EP 1843874A1 EP 05822749 A EP05822749 A EP 05822749A EP 05822749 A EP05822749 A EP 05822749A EP 1843874 A1 EP1843874 A1 EP 1843874A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- carbon dioxide
- mixing chamber
- gas
- chamber
- gas flow
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C5/00—Devices or accessories for generating abrasive blasts
- B24C5/02—Blast guns, e.g. for generating high velocity abrasive fluid jets for cutting materials
- B24C5/04—Nozzles therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/003—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods using material which dissolves or changes phase after the treatment, e.g. ice, CO2
Definitions
- the invention relates to an apparatus and a method for cleaning, activating or pretreating workpieces by means of carbon dioxide snow blasting generated from pressurized CO2 fluids and at least one carrier pressure gas accelerated by an outlet nozzle, wherein a two-phase carbon dioxide mixture consisting of carbon dioxide gas and carbon dioxide particles in an agglomeration chamber is generated by agglomeration and compression of carbon dioxide snow crystals and mixed with the carrier gas.
- the document US-A 4962891 describes an apparatus for producing a mixture of CO2 particles and CO2 gas from liquid CO2 and their acceleration to high speeds through a narrow slot nozzle for removing contaminants from a substrate material such as optical apparatus or wafers. Naturally, in such applications, the surface to be cleaned may only be subjected to a low energy density.
- the patent US-A 5616067 a method and an apparatus for cleaning pressure-sensitive surfaces with relatively low energy is described in the liquid CO2 in a centric air flow, for special purposes, a nitrogen flow, metered and accelerated according to the injector principle.
- the conversion into abrasive CO2 particles of very small dimension takes place in the gas flow itself, a relaxation or agglomeration chamber for a CO2 snow formation is not disclosed. It is proposed a nozzle in the manner of known convergent divergent cross-sectional shapes in the longitudinal direction (axial direction) with variable oval or square outlet cross-section. CO2 is admitted tangentially into the divergent outlet cross-section.
- US-A-5405283 discloses a method and apparatus for cooling low pressure compressed air with nitrogen and passing the resulting gas into a chamber along with expanded CO2 fluid. Through a jet nozzle with convergent and divergent section for transporting, mixing and accelerating the CO2 particles at supersonic speed, the gas mixture is directed to substrates with strongly adhering impurities for cleaning.
- WO 03/022525 describes a blasting method and a blasting apparatus for cleaning surfaces.
- an additional abrasive blasting agent or liquid from a pressure source can be added to a blasting medium with a blasting medium, such as a blasting medium. Dry ice, to be dosed. It should be achieved with the arrangement a high beam power and / or a wide fanning of the beam.
- Document WO 00/74897 A1 describes a jet tool for generating a beam of CO2 snow with a first nozzle and a second nozzle for generating a support beam which encloses the first beam. At the nozzle exit of the first nozzle, the phase transformation takes place from liquid CO2.
- Document WO2004 / 033154 A1 describes a blasting method and a blasting device for cleaning surfaces. To a centrifuge in a tube supplied carrier gas pressurized CO2 gas is converted in a flash room in dry snow or liquid CO2, partly in dry ice particles, and fed at an acute angle to the jet pipe. The carrier gas stream acts as an injector.
- the carrier gas volume or the liquid CO2 can be metered by throttle valves; the jet mixture is then directed, preferably at the speed of sound, via the Laval nozzle onto the substrate to be cleaned.
- the cleaning effect should be increased by supplying water drops and / or ice pellets.
- the invention is based on the problem of providing a method and a device for cleaning by means of carbon dioxide snow blasting, with low investment and operating costs and without damaging the processed substrate surfaces high beam powers, measured as a surface effect per Time unit during cleaning / pretreatment / activation of Surfaces, is possible.
- the technology in continuous operation should be automated with low logistics costs.
- the first solution comprises a method for cleaning, activating or pretreating workpieces by means of carbon dioxide snow jets generated from pressurized CO2 fluids and at least one carrier pressurized gas expelled through an outlet nozzle, wherein a two-phase carbon dioxide mixture consisting of carbon dioxide gas and carbon dioxide particles in an agglomeration chamber Agglomeration and compression of carbon dioxide snow crystals produced and mixed with the carrier gas, via a metering of a mixing chamber, in which a centric gas flow of carrier gas flows, fed, the gas flow radially metered from the outside, turbulently mixed, accelerated in an outlet nozzle with the mixed turbulent gas and is directed to a workpiece.
- the admixing should preferably take place in a three-stage mixing chamber, wherein in the first region of the mixing chamber the two-phase carbon dioxide mixture flows uniformly around a jet pipe projecting into the mixing chamber, in the second region of the mixing chamber the gas flow flowing from the jet pipe into the mixing chamber, and in the third region the mixing chamber is turbulently mixed.
- turbulence formation can be promoted in the middle or rear region by means of specifically predeterminable geometry of the inner wall of the mixing chamber, by directing the CO.sub.2 mixture into the flow of the jet pipe.
- the process usually takes place with a gas flow, which is set when entering the mixing chamber to a temperature of 10 0 C to 40 0 C; This is easily achieved in compressed air generation.
- the gas flow can be adjusted to a temperature greater than 50 ° C when entering the mixing chamber, for example by arranging a heater on the jet pipe. This makes it possible to obtain condensate water neither at the outlet nozzle nor at the workpiece to be machined. Due to the resulting higher average temperature or the temperature spread between carrier gas and CO2 mixture, the cleaning shock on the workpiece is greater. Experiments have shown improved cleaning as a result.
- the mixing effect of the gases and the stabilization of the gas stream can be supported according to the invention, if the components to be mixed a swirl / helical rotation is impressed by corresponding internals in the device.
- the process becomes more energy-rich if liquid droplets, preferably water droplets, are supplied to the gas flow or to the mixing chamber according to the invention.
- inert liquid nitrogen is added.
- the second solution comprises a device for cleaning, activating or pretreating workpieces by means of carbon dioxide snow blasting, in particular for carrying out the method described, comprising a jet device with controllable feeders and pressure sources for carrier gas and carbon dioxide fluid, an agglomeration chamber for the production of carbon dioxide snow crystals and a Mixing device for the carrier gas and carbon dioxide and outlet nozzle arranged behind it, in which the carrier gas supply device is designed as a jet pipe protruding into the mixing device, the agglomeration chamber for agglomeration and compression of carbon dioxide snow crystals in a two-phase carbon dioxide mixture has a metering opening which opens into an annular space, the mixing device as a multi-part mixing chamber is formed at one end with an annular space and at the other end has an outlet opening, which opens into the outlet nozzle.
- the mixing chamber can have a constriction or internals in the rear part regions for enhancing the turbulence of the gas streams.
- the agglomeration chamber may preferably be formed as a tube with inner ribs, wherein the inner ribs of the agglomeration chamber in the flow direction of the carbon dioxide CO2 (arrow) are linear or arranged in the form of a helix on the inner circumference of the tube.
- the outlet nozzle will usually be a Laval nozzle, but according to the invention, other shapes with flat cross-section or circular or annular outlet applicable and their application according to the requirements of the workpiece offered, depending on whether large areas or holes, ribs, grooves or the like are to be cleaned. The limits of - according to previous practical experiments - useful usable nozzles with good results are determined in the dependent claims.
- the carbon dioxide particles are generated in an agglomeration chamber of carbon dioxide snow crystals by agglomeration and compression processes.
- This type of production of carbon dioxide particles compared to the prior art significantly higher beam performance in cleaning, pretreatment and activation of surfaces.
- the technology can be automated in continuous operation and operated with low logistics costs.
- the parameters pressure, volume flow and / or temperature of the fluids used in the method are sensed by a computer by means of sensors and detected and controlled after adjustment with predetermined or calculated setpoints.
- a relative movement of the outlet nozzle to the workpiece to be machined can be controlled by computer and thus also any workpieces sensed by location and orientation and the surface to be treated are covered with the beam device.
- a control computer For the automation, a control computer is used, which accesses a pneumatic control via electrical actuators. The process and adjustment parameters are detected by means of sensors and fed to the control computer as electrical signals.
- the primary control of the carbon dioxide snow jet or the device is purely pneumatic, so that the method can be used without electrical connection.
- pneumatic components are significantly less susceptible to interference and maintenance compared to electrical ones.
- the cleaning and pretreatment process for carbon dioxide snow blasting can be used industrially for the automated cleaning of plastic components before painting processes.
- the aim is to completely clean the plastic surfaces before painting, ie in particular the removal of fats, oils, release agents, fingerprints, dust particles and sanding dust.
- the carrier gas used was particle, oil and water-free compressed air, which was generated by a screw compressor and then processed.
- the carbon dioxide supply was via a low-pressure tank.
- the setting parameters for the jet pressure of the compressed air were between 2 bar and 6 bar at a volume flow between 2 m 3 / min and 6 m 3 / min and for the pressure of the carbon dioxide between 18 bar and 22 bar.
- a round or flat nozzle is used.
- the nozzle was guided over the component to be cleaned with the aid of a six-axis industrial robot.
- a computer was used to control the system parameters, in this case pressures and volume flows of compressed air and CO2, as well as the speed of the relative movement of the blasting device and its position relative to the workpiece surface to be machined.
- the consumption of carbon dioxide is dependent on the nozzle used and the amount or adhesive force of the impurities of the plastic surface and is between 0.2 kg / min and 1.0 kg / min.
- the feed rate of the jet nozzle is between 200 mm / s and 600 mm / s. If a flat nozzle with a jet width of 80mm is used, a surface between 1 m 2 / min and 3 m 2 / min can be cleaned. The surface cleanliness analysis after cleaning was performed optically with a light microscope and a wipe test. In addition, analyzes of the directly applied paint system were carried out. Result:
- Cleaning large injection molds which may have a surface area of 1 m 2 to 8 m 2 , requires the removal of baked-on, highly adhesive release agent residues from these tool surfaces. It is compressed air with a jet pressure of 8 bar to 10 bar at a volume flow of 6 to 8 m 3 / min generated by a screw compressor.
- the carbon dioxide supply is carried out by means of riser bottles, preferably arranged in a bottle bundle. The pressure of the carbon dioxide is between 40 bar and 60 bar.
- the cleaning device is manually guided over the tool surface to be cleaned. Depending on the adhesive force and the amount of impurities on the mold surface, the cleaning performance is between 0.2 m 2 / min and 1, 0 m 2 / min.
- the carbon dioxide consumption when using a round nozzle with a beam diameter of 20 mm was 1 kg / min.
- the beam energy was varied on the one hand by deliberately introducing water droplets into the mixing chamber.
- a control of the jet velocity in the range of 100 m / s to 300 m / s has proven to be favorable.
- FIG. 1 shows a device according to the invention for CO2 snow blasting, wherein numerous embodiments of the device are shown together in a figure; 2 shows different embodiments A, B, C, D of an outlet nozzle for the device according to FIG. 1.
- Fig. 1 shows the apparatus for carbon dioxide snow blasting.
- a gas flow 2 is passed via the gas supply line 3 and a jet pipe 4 projecting into the mixing chamber 1.
- the gas flow is clean air generated by a compressor 5.
- inert gas such as nitrogen, which is taken from a pressure tank 6, find application.
- an agglomeration chamber 8 for CO2 snow particles Arranged transversely to the jet pipe 4 and the mixing chamber 1 is an agglomeration chamber 8 for CO2 snow particles, which encloses the jet pipe 4 on its outlet side. Via a valve (not shown), CO 2 (arrow direction) is passed in liquid form from a tank, not shown, into the agglomeration chamber 8 and is depressurized there. Via a metering opening 7 on the circumference of the mixing chamber 1, a two-phase carbon dioxide mixture 9 consisting of carbon dioxide gas and carbon dioxide particles of the mixing chamber 1 is supplied.
- the two-phase carbon dioxide mixture flows around the jet pipe 4 of the gas supply line 3 projecting into the mixing chamber 1 and is radially metered into the gas flow 2 in a second region 11 of the mixing chamber 1.
- a turbulent mixing of two-phase carbon dioxide mixture 9 consisting of carbon dioxide gas and carbon dioxide particles takes place with the gas flow 2.
- a mixed gas flow with carbon dioxide particles flows into an outlet nozzle 14 and is accelerated there.
- a carbon dioxide snow jet 16 which can be used for cleaning or pretreating or activating a workpiece surface 17.
- additive components or measures can increase the degree of automation of the method or enable finer control and adaptation to the machining task.
- Control via computer is not explicitly shown; preferred is a pneumatic control, wherein sensors and actuators are attached to all in the following also in detail to be supplemented functional units.
- sensors and actuators are attached to all in the following also in detail to be supplemented functional units.
- the device at least as a basic unit, for small-area applications also be designed as a portable "backpack device" for manual applications.
- Embodiment 2 is a diagrammatic representation of Embodiment 1:
- Embodiment 3 is a diagrammatic representation of Embodiment 3
- Embodiment 6 is a diagrammatic representation of Embodiment 6
- pretreatment and / or activation directly into the mixing chamber preferably in the first region 10 and second region 11 of the mixing chamber 1, water droplets and / or corrosion-inhibiting substances, preferably Phosphates, and / or solid abrasive particles introduced via a feed system 22.
- Embodiment 7 is a diagrammatic representation of Embodiment 7:
- Embodiment 8 is a diagrammatic representation of Embodiment 8
- the biphasic carbon dioxide mixture consisting of carbon dioxide gas and carbon dioxide particles 9 before the supply via the Dosing 7 cooled in the mixing chamber 1 from the outside with a cooling system 24 with thermosensor with liquid nitrogen from the reservoir 25.
- Embodiment 9 is a diagrammatic representation of Embodiment 9:
- Another possibility for cooling is the direct metering of liquid nitrogen into the two-phase carbon dioxide mixture consisting of carbon dioxide gas and carbon dioxide particles 9 before being fed via the metering opening 7 into the mixing chamber 1 via a nitrogen metering system 26.
- the inner fin 27 serves in the agglomeration chamber 8 as an aid to increased snow formation and leads that the carbon dioxide snow crystals aggregate into larger and denser carbon dioxide particles 9.
- the inner fins of the chamber designed as a finned tube extend in the direction of flow of the CO 2 (arrow) flowing liquid from a source, which of course is in all embodiments of the device via a nozzle (not shown) with a predeterminable or adjustable cross section.
- the jet power can be additionally increased if the inner ribs 27 of the inner fin tube are formed in the form of a helix on the inner circumference of the chamber 8.
- 2 shows some embodiments A, B, C, D for the nozzle 14, from whose nozzle opening 15 the carbon dioxide snow jet 16 exits and can be used to clean, pretreat and activate a workpiece surface 17.
- 2A As the nozzle 14, a Laval nozzle 28 having a convergent section 29, a cylindrical section 30 and a divergent section 31 can be used. The geometry of the exit cross section corresponds to a circle 32.
- FIG. 2B The device for carbon dioxide snow blasting offers the possibility of application-dependent round nozzles 33 with an outlet cross-sectional area of the geometry of a circle 34.
- Fig. 2C / 2D Flat nozzles 35 with an exit cross-sectional area of the geometry of a rectangle 36 or an ellipse 37, but also annular nozzles 38 with flow fixtures 39 and an exit cross-sectional area of the geometry of a circular ring 40 to use.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cleaning In General (AREA)
- Nozzles (AREA)
- Cleaning By Liquid Or Steam (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102005005638A DE102005005638B3 (de) | 2005-02-05 | 2005-02-05 | Verfahren und Vorrichtung zum Reinigen, Aktivieren oder Vorbehandeln von Werkstücken mittels Kohlendioxidschnee-Strahlen |
| PCT/EP2005/012866 WO2006081856A1 (de) | 2005-02-05 | 2005-11-28 | Vorrichtung und verfahren zum reinigen, aktivieren oder vorbehandeln von werkstücken mittels kohlendioxidschnee-strahlen |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1843874A1 true EP1843874A1 (de) | 2007-10-17 |
| EP1843874B1 EP1843874B1 (de) | 2013-02-27 |
Family
ID=35613066
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP05822749A Expired - Lifetime EP1843874B1 (de) | 2005-02-05 | 2005-11-28 | Vorrichtung und verfahren zum reinigen, aktivieren oder vorbehandeln von werkstücken mittels kohlendioxidschnee-strahlen |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US7967664B2 (de) |
| EP (1) | EP1843874B1 (de) |
| JP (1) | JP4939439B2 (de) |
| CN (1) | CN101124065B (de) |
| CA (1) | CA2597005C (de) |
| DE (1) | DE102005005638B3 (de) |
| ES (1) | ES2409161T3 (de) |
| WO (1) | WO2006081856A1 (de) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2420353A1 (de) | 2010-08-16 | 2012-02-22 | desisa GmbH | Vorrichtung und Verfahren zur Abgabe von Trockeneisschnee |
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| US20080314513A1 (en) * | 2007-06-19 | 2008-12-25 | Achim Gauss | Device for imparting a pattern onto the surface of work pieces |
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| DE102018208753A1 (de) * | 2018-06-04 | 2019-12-05 | Bausch + Ströbel Maschinenfabrik Ilshofen GmbH + Co. KG | Verfahren und Vorrichtung zum Reinigen von Primärpackmitteln |
| DE102019108289A1 (de) * | 2019-03-29 | 2020-10-01 | acp systems AG | Vorrichtung zum Erzeugen eines CO2-Schnee-Strahls |
| CN110665667A (zh) * | 2019-11-14 | 2020-01-10 | 南京鹏昆环保科技有限公司 | 一种气粉混合的复合型喷嘴 |
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| WO2023158868A1 (en) * | 2022-02-21 | 2023-08-24 | Cold Jet, Llc | Method and apparatus for minimizing ice build up within blast nozzle and at exit |
| CN120115470B (zh) * | 2025-05-13 | 2025-07-22 | 禧玛诺(连云港)实业有限公司 | 一种鞋用模具的干冰清洗装置 |
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- 2005-02-05 DE DE102005005638A patent/DE102005005638B3/de not_active Expired - Lifetime
- 2005-11-28 ES ES05822749T patent/ES2409161T3/es not_active Expired - Lifetime
- 2005-11-28 CA CA2597005A patent/CA2597005C/en not_active Expired - Lifetime
- 2005-11-28 JP JP2007553473A patent/JP4939439B2/ja not_active Expired - Fee Related
- 2005-11-28 WO PCT/EP2005/012866 patent/WO2006081856A1/de not_active Ceased
- 2005-11-28 CN CN2005800477683A patent/CN101124065B/zh not_active Expired - Lifetime
- 2005-11-28 US US11/815,514 patent/US7967664B2/en active Active
- 2005-11-28 EP EP05822749A patent/EP1843874B1/de not_active Expired - Lifetime
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2420353A1 (de) | 2010-08-16 | 2012-02-22 | desisa GmbH | Vorrichtung und Verfahren zur Abgabe von Trockeneisschnee |
| WO2012022735A1 (de) | 2010-08-16 | 2012-02-23 | Desisa Gmbh | Vorrichtung und verfahren zur abgabe von trockeneisschnee |
| US9975216B2 (en) | 2010-08-16 | 2018-05-22 | Desisa Gmbh | Device and method for dispensing dry ice snow |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2006081856A1 (de) | 2006-08-10 |
| US20080092923A1 (en) | 2008-04-24 |
| JP2008529760A (ja) | 2008-08-07 |
| CN101124065A (zh) | 2008-02-13 |
| CA2597005C (en) | 2013-05-07 |
| CN101124065B (zh) | 2012-01-04 |
| DE102005005638B3 (de) | 2006-02-09 |
| US7967664B2 (en) | 2011-06-28 |
| CA2597005A1 (en) | 2006-08-10 |
| EP1843874B1 (de) | 2013-02-27 |
| JP4939439B2 (ja) | 2012-05-23 |
| ES2409161T3 (es) | 2013-06-25 |
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