EP0668811B1 - Method of cooling parts of surfaces - Google Patents
Method of cooling parts of surfaces Download PDFInfo
- Publication number
- EP0668811B1 EP0668811B1 EP93919125A EP93919125A EP0668811B1 EP 0668811 B1 EP0668811 B1 EP 0668811B1 EP 93919125 A EP93919125 A EP 93919125A EP 93919125 A EP93919125 A EP 93919125A EP 0668811 B1 EP0668811 B1 EP 0668811B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- flexible
- cooled
- cooling
- painted
- part areas
- 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.)
- Expired - Lifetime
Links
- 238000001816 cooling Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000007788 liquid Substances 0.000 claims description 13
- 239000003973 paint Substances 0.000 claims description 11
- 230000000694 effects Effects 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 239000008187 granular material Substances 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 238000010422 painting Methods 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 239000012267 brine Substances 0.000 claims description 2
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 2
- 239000001110 calcium chloride Substances 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 238000007654 immersion Methods 0.000 claims description 2
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 239000004411 aluminium Substances 0.000 claims 1
- 229910052782 aluminium Inorganic materials 0.000 claims 1
- 239000007789 gas Substances 0.000 description 13
- 238000005498 polishing Methods 0.000 description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 4
- 239000004744 fabric Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000007591 painting process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000003618 dip coating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000004922 lacquer Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000009958 sewing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 239000002966 varnish Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/007—After-treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B29/00—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
- B24B55/02—Equipment for cooling the grinding surfaces, e.g. devices for feeding coolant
Definitions
- the invention relates to methods for cooling partial areas of larger, painted areas for subsequent processing.
- Cooling partial areas of the surface of a workpiece, in particular also at temperatures below the ambient temperature, in an energetically favorable, quick and low-effort manner is a task that at first glance appears to be very simple.
- this task has been occurring more and more frequently recently, since components of all kinds - for example in the automotive industry - are coated with special, highly elastic paints, and punctual paintwork defects that occur repeatedly in the painting process are not readily caused by well-known ones Polishing can be touched up because these varnishes do not allow satisfactory polishing at normal temperatures. In these cases, effective and clean polishing is only possible when the said defects have cooled significantly below ambient temperature.
- the object of the present invention is therefore to provide an advantageous possibility for cooling partial areas of painted surfaces, which is particularly suitable even if the surface area to be cooled is permanently moved with a workpiece - for example in a continuous production.
- contour-flexible elements are cooled to cryogenic temperatures with the help of cryogenic liquid gases, for example by immersion and / or spraying, liquid nitrogen preferably being used for reasons of cost and manageability.
- cryogenic liquid gases for example by immersion and / or spraying
- liquid nitrogen preferably being used for reasons of cost and manageability.
- other cryogenic liquid gases for example liquid argon or liquid air, can also be used.
- cooling the cooling elements using CO 2 ice or snow.
- the objective can be to cool a part coming directly from a painting process - for example dip coating - back to about room temperature, and on the other hand
- further cooling of a paint spot is necessary for subsequent processing, such as sanding or polishing.
- Temperatures of below 0 ° to -150 ° C., preferably -20 to -60 ° C., are advantageously produced for preparation of processing for highly elastic paints.
- a favorable embodiment of the invention with regard to the contour-flexible element consists in that as such one with small-sized solid bodies, preferably with metal balls or metal granules - e.g. bags filled with steel, copper or aluminum granules. Cloth bags made of silk, felt and other cold-flexible materials can be used as bags. Bag-like containers made of soft wire mesh are also possible.
- a flexible container that is filled with a liquid that remains liquid in the relevant temperature range, e.g. Calcium chloride brine, filled, is used.
- a particularly advantageous possibility in the case of magnetic substrates for fastening the cooling elements according to the invention to the surface parts to be cooled is that they are attached by means of magnets.
- the magnets can be arranged on or in the cooling bag, for example in corresponding pockets.
- the contour-flexible element can be attached with the aid of suction cups - that is to say under negative pressure - with or adhesive elements at the location of the cooling effect to be exerted.
- the cooling element is attached or held at the location of its cooling effect with the aid of additional tools, for example clamps.
- cooling of a partial area with a defect has hitherto often been accomplished by inflating cold gas.
- a cloth bag filled with steel grains - diameter of the grains advantageously about 1 mm - is applied to the flaw to be polished.
- This bag was previously cooled in a liquid nitrogen bath and is now to be left on the partial surface to be cooled for about 5 to 30 seconds.
- An advantageously designed bag has a flat outer shape, which can be obtained by appropriate sewing of corresponding fabric parts forming several chambers, this bag design also ensuring a uniform distribution of the filling.
- Favorable external dimensions of this cooling element are about 10 to 30 cm side length and 1 to 2 cm thickness.
- the pouch can be attached to the paint at the desired location, for example with suction cups attached to the pouch, and an orientation of the pouch and component which increases the pouch pressure is also favorable with respect to gravity.
- the bag can also be held and pressed onto the respective component with various types of clamps, so that there is no constraint with regard to the orientation of the component to be processed.
- a magnetic adhesive mechanism is particularly advantageous.
- a corresponding cooling bag can also be pressed onto a point to be cooled by hand or lie on it following gravity.
- the surfaces underneath the cooling bags are cooled as required and can be polished perfectly, and the fault is then usually corrected in a polishing phase until they are reheated.
- the procedure according to the invention is - as can be easily understood - particularly advantageous in assembly line production, since the corresponding cooling elements only have to be fitted once, then move with the component until they can finally be removed again at the processing point. If necessary, the cooling and polishing process can also be repeated more often.
- the proposal according to the invention thus provides a further possibility for the partial cooling of surface areas of workpieces or components, which has particular advantages in a number of applications.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Blast Furnaces (AREA)
Abstract
Description
Die Erfindung betrifft Verfahren zum Abkühlen von Teilflächen von größeren, lackierten Flächen für eine nachfolgende Bearbeitung.The invention relates to methods for cooling partial areas of larger, painted areas for subsequent processing.
Die Abkühlung von Teilbereichen der Oberfläche eines Werkstücks, insbesondere auch auf Temperaturen unterhalb der Umgebungstemperatur energetisch günstig, schnell und aufwandsarm durchzuführen ist eine, nur auf den ersten Blick sehr einfach erscheinende Aufgabe. Diese Aufgabe tritt zudem in jüngerer Zeit immer häufiger auf, da Bauteile verschiedenster Art - z.B. in der Autoindustrie - mit speziellen, hochelastischen Lacken lackiert werden und dabei im Lackierungsprozeß immer wieder auftretende, punktuelle Lackierungsfehler nicht ohne weiteres durch altbekanntes Polieren ausbesserbar sind, weil diese Lacke bei Normaltemperaturen kein befriedigendes Polieren zulassen. Erst wenn die besagten Fehlstellen deutlich unter Umgebungstemperatur abgekühlt sind, ist in diesen Fällen ein wirksames und sauberes Polieren möglich.Cooling partial areas of the surface of a workpiece, in particular also at temperatures below the ambient temperature, in an energetically favorable, quick and low-effort manner is a task that at first glance appears to be very simple. In addition, this task has been occurring more and more frequently recently, since components of all kinds - for example in the automotive industry - are coated with special, highly elastic paints, and punctual paintwork defects that occur repeatedly in the painting process are not readily caused by well-known ones Polishing can be touched up because these varnishes do not allow satisfactory polishing at normal temperatures. In these cases, effective and clean polishing is only possible when the said defects have cooled significantly below ambient temperature.
Die geschilderte Abkühlaufgabe ist also gerade in der heutigen Automobilfertigungstechnik, aber auch in verwandten Gebieten von nicht unerheblicher Bedeutung. Bislang wurde dieses Problem zum Teil - wie es relativ naheliegenden Überlegungen entspricht - dadurch gelöst, daß Bauteile im Ganzen in einer Kühlkammer im erforderlichen Maß abgekühlt wurden und im Anschluß daran der Polier- oder auch ein Schleifvorgang erfolgte. Das Abkühlen des gesamten Bauteils stellt aber eine aufwendige, energetisch ungünstige und zeitraubende Lösung dar.The cooling task described is therefore of considerable importance, especially in today's automotive manufacturing technology, but also in related areas. So far, this problem has been partly solved - as it corresponds to relatively obvious considerations - by cooling components as a whole in a cooling chamber to the required extent and then polishing or grinding. However, cooling the entire component is a complex, energetically unfavorable and time-consuming solution.
Eine wesentliche Verbesserung der Umstände wurde dann durch den Vorschlag gemäß der EP-A 0 332 956 erreicht, nämlich eine Abkühlung nur eines relevanten Teilbereichs eines lackierten Werkstücks dadurch zu erzielen, daß dieser mit einem sehr kalten Gas - Gastemperatur unterhalb -50°C - angeblasen wird. Diese Vorgehensweise mit dem Einsatz eines Kaltgases, welches in günstiger Weise aus tiefkalten Flüssiggasen gewonnen werden kann, bedingt zwar eine Kaltgasversorgung, sie ermöglicht jedoch eine schnelle und gezielte Abkühlung der betreffenden Flächenteile einer größeren, lackierten Fläche.A substantial improvement in the circumstances was then achieved by the proposal according to EP-A 0 332 956, namely to achieve cooling of only a relevant part of a painted workpiece by blowing it on with a very cold gas - gas temperature below -50 ° C becomes. This procedure with the use of a cold gas, which can be obtained inexpensively from cryogenic liquid gases, does indeed require a cold gas supply, but it enables the relevant parts of a large, painted surface to be cooled quickly and in a targeted manner.
Ein gewisser Nachteil bei diesem Verfahren hat sich nun allerdings dadurch ergeben, daß es mit der in der Regel aus einem fahrbaren Flüssiggasbehälter mit zugehöriger Gasentnahmevorrichtung und entsprechenden Gasleitungen aufgebauten Kaltgasversorgung zu Schwierigkeiten insofern kommt, als diese Gasversorgung im Fließbandbetrieb häufig auf Teilstücken mit den zu bearbeitenden und fortbewegten Bauteilen mitzubewegen ist und dies aufgrund von Gewicht, Größe und Aufbau solcher Versorgungseinheiten nicht ohne Probleme möglich ist.A certain disadvantage with this method has now arisen, however, that difficulties arise with the cold gas supply, which is generally constructed from a mobile liquid gas container with associated gas extraction device and corresponding gas lines, in that this gas supply in assembly line operation is often to be moved on sections with the components to be machined and moved and this is not possible without problems due to the weight, size and structure of such supply units.
Die Aufgabenstellung zu vorliegender Erfindung besteht daher darin, eine vorteilhafte Möglichkeit zur Abkühlung von Teilflächen von lackierten Flächen anzugeben, die sich insbesondere gerade auch dann eignet, wenn der abzukühlende Flächenbereich mit einem Werkstück - beispielsweise in einer Fließfertigung - permanent fortbewegt wird.The object of the present invention is therefore to provide an advantageous possibility for cooling partial areas of painted surfaces, which is particularly suitable even if the surface area to be cooled is permanently moved with a workpiece - for example in a continuous production.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß eine betreffende Teilfläche mit einem von seinen Abmessungen geeignet ausgelegten, konturflexiblen Element beaufschlagt wird, das vorausgehend abgekühlt und geeignet auf der zu kühlenden Fläche befestigt wird.This object is achieved according to the invention in that a partial area in question is acted upon by a contour-flexible element suitably designed with its dimensions, which element has previously been cooled and suitably fastened to the area to be cooled.
Besonders effektiv ist es dabei, wenn die konturflexiblen Elemente mit Hilfe von tiefkalten Flüssiggasen auf tiefkalte Temperaturen beispielsweise durch Eintauchen und/oder Besprühen abgekühlt werden, wobei hierzu aus Kosten- und Handhabbarkeitsgründen bevorzugt Flüssigstickstoff zur Anwendung kommt. Es sind jedoch auch andere, tiefkalte Flüssiggase, z.B. Flüssigargon oder Flüssigluft, einsetzbar. Ebenso besteht die Möglichkeit eine Abkühlung der Kühlelemente durch CO2-Eis oder -Schnee zu bewirken.It is particularly effective if the contour-flexible elements are cooled to cryogenic temperatures with the help of cryogenic liquid gases, for example by immersion and / or spraying, liquid nitrogen preferably being used for reasons of cost and manageability. However, other cryogenic liquid gases, for example liquid argon or liquid air, can also be used. There is also the possibility of cooling the cooling elements using CO 2 ice or snow.
In der Praxis sind nun hinsichtlich der Anwendung des erfindungsgemäßen Verfahrens auf lackierte Bauteile zwei etwas unterschiedliche Fälle gegeben. Zum einen kann es die Zielsetzung sein, ein unmittelbar aus einem Lackierprozeß - z.B. einer Tauchlackierung - kommendes Teil wieder auf etwa Raumtemperatur abzukühlen, zum anderen ist gerade im Falle hochelastischer Lacke eine weitergehende Unterkühlung einer Lackstelle für eine darauf folgende Bearbeitung, z.B. ein Abschleifen oder ein Polieren, notwendig. Mit Vorteil werden zur Bearbeitungsvorbereitung bei hochelastischen Lacken Temperaturen von unter 0° bis -150°C, vorzugsweise -20 bis -60°C, hergestellt.In practice, there are two somewhat different cases with regard to the application of the method according to the invention to painted components. On the one hand, the objective can be to cool a part coming directly from a painting process - for example dip coating - back to about room temperature, and on the other hand In the case of highly elastic paints, further cooling of a paint spot is necessary for subsequent processing, such as sanding or polishing. Temperatures of below 0 ° to -150 ° C., preferably -20 to -60 ° C., are advantageously produced for preparation of processing for highly elastic paints.
Eine günstige Ausbildung der Erfindung hinsichtlich des konturflexiblen Elementes besteht darin, daß als solches ein mit kleinteiligen Festkörpern, vorzugsweise mit Metallkugeln oder Metallgranulat - z.B. mit Stahl-, Kupfer- oder Aluminiumgranulat - gefüllter Beutel angewendet wird. Als Beutel können Stoffbeutel aus Seide, Filz und anderen, kälteflexiblen Materialien zur Anwendung kommen. Ebenso sind beutelartige Behältnisse aus weichen Drahtgeweben möglich.A favorable embodiment of the invention with regard to the contour-flexible element consists in that as such one with small-sized solid bodies, preferably with metal balls or metal granules - e.g. bags filled with steel, copper or aluminum granules. Cloth bags made of silk, felt and other cold-flexible materials can be used as bags. Bag-like containers made of soft wire mesh are also possible.
Eine weitere, vorteilhafte Möglichkeit in diesem Zusammenhang besteht darin, daß als konturflexibles Element ein flexibles Behältnis, das mit einer, in dem relevanten Temperaturbereich flüssig bleibenden Flüssigkeit, z.B. Calciumchloridsole, gefüllt ist, zur Anwendung kommt.Another advantageous possibility in this connection is that as a flexible element, a flexible container that is filled with a liquid that remains liquid in the relevant temperature range, e.g. Calcium chloride brine, filled, is used.
Eine im Falle magnetischer Untergründe besonders vorteilhafte Möglichkeit zur Befestigung der erfindungsgemäßen Kühlelemente an den zu kühlenden Flächenteilen besteht darin, daß diese mit Hilfe von Magneten angeheftet werden. Die Magnete können dabei am oder im Kühlbeutel angeordnet sein, beispielsweise in entsprechenden Taschen. In anderen, "nichtmagnetischen" Einsatzfällen kann das konturflexible Element mit Hilfe von Saugnäpfen - also unter Unterdruckanwendung - mit oder Klebeelementen am Ort der auszuübenden Kühlwirkung befestigt werden. Ebenso besteht die Möglichkeit, daß das Kühlelement mit Hilfe von zusätzlichen Werkzeugen, z.B. Klemmen, am Ort seiner Kühlwirkung befestigt oder gehalten wird.A particularly advantageous possibility in the case of magnetic substrates for fastening the cooling elements according to the invention to the surface parts to be cooled is that they are attached by means of magnets. The magnets can be arranged on or in the cooling bag, for example in corresponding pockets. In other, "non-magnetic" applications, the contour-flexible element can be attached with the aid of suction cups - that is to say under negative pressure - with or adhesive elements at the location of the cooling effect to be exerted. There is also the possibility that the cooling element is attached or held at the location of its cooling effect with the aid of additional tools, for example clamps.
Im folgenden wird beispielhaft eine Ausführungsvariante der Erfindung im Detail beschrieben.An exemplary embodiment variant of the invention is described in detail below.
Bei der Lackierung von z.B. Auto-Stoßfängern, die aus Kunststoff bestehen, werden insbesondere auch die eingangs angesprochenen, hochelastischen Lacke, beispielsweise 2K-Polyurethan-Lacke oder Lacke auf Acrylatbasis, angewendet (hochelastische Lacke kommen im Regelfall eben auch auf besonders elastischen Bauteilen zum Einsatz). Auch bei der Lackierung dieser Teile treten immer wieder kleinere Fehlstellen in den Lackierungen auf, beispielsweise aufsitzende Staubkörner oder sonstige Flecken, die nach dem Aushärten der Lackierung gewöhnlich durch eine punktuelle Behandlung beseitigbar sind. Bei den hochelastischen Lacken gelingt dies einwandfrei dadurch, daß man das gegebenenfalls vorhandene Staubkorn entfernt, dann die vorhandene Fehlstelle mit umliegendem Flächenbereich auf Temperaturen von -20 bis -60°C abkühlt und die Stelle schließlich mit einer Poliermaschine, z.B. mit einer Lammfellpoliermaschine und gegebenfalls unter Anwendung eines Poliermittels poliert.When painting e.g. Car bumpers that are made of plastic are used in particular with the highly elastic paints mentioned at the beginning, for example 2-component polyurethane paints or acrylic-based paints (highly elastic paints are usually also used on particularly elastic components). Even when painting these parts, minor flaws in the paintwork occur again and again, for example, dust particles or other stains that can usually be removed by spot treatment after the paint has hardened. In the case of the highly elastic lacquers, this is achieved perfectly by removing any dust particles that may be present, then cooling the existing defect with the surrounding surface area to temperatures of -20 to -60 ° C. and finally using a polishing machine, e.g. polished with a lambskin polishing machine and, if necessary, using a polishing agent.
Wie eingangs beschrieben, wurde die Abkühlung einer Teilfläche mit einer Fehlstelle bislang häufig durch Aufblasen von Kaltgas bewerkstelligt. Demgegenüber wird jetzt - gemäß vorliegender Erfindung - beispielsweise ein mit Stahlkörnern gefüllter Stoffbeutel - Durchmesser der Körner mit Vorteil ca. 1 mm - auf die zu polierende Fehlstelle aufgebacht. Dieser Beutel wurde zuvor in einem Flüssigstickstoffbad abgekühlt und ist jetzt ca. 5 bis 30 sec. auf der zu kühlenden Teilfläche zu belassen. Ein vorteilhaft ausgebildeter Beutel besitzt eine flache Außenform, die durch entsprechende, mehrere Kammern bildende Vernähung von entsprechenden Stoffteilen erhaltbar ist, wobei mit dieser Beutelausbildung auch eine gleichmäßige Verteilung der Füllung gewährleistet wird. Günstige Außenmaße dieses Kühlelements liegen bei etwa 10 bis 30 cm Seitenlänge und 1 bis 2 cm Dicke.As described at the beginning, cooling of a partial area with a defect has hitherto often been accomplished by inflating cold gas. In contrast, according to the present invention, for example a cloth bag filled with steel grains - diameter of the grains advantageously about 1 mm - is applied to the flaw to be polished. This bag was previously cooled in a liquid nitrogen bath and is now to be left on the partial surface to be cooled for about 5 to 30 seconds. An advantageously designed bag has a flat outer shape, which can be obtained by appropriate sewing of corresponding fabric parts forming several chambers, this bag design also ensuring a uniform distribution of the filling. Favorable external dimensions of this cooling element are about 10 to 30 cm side length and 1 to 2 cm thickness.
Der Beutel kann an der gewünschten Stelle etwa mit am Beutel befestigten Saugnäpfen auf der Lackierung angeheftet werden, wobei außerdem eine, den Beutelandruck erhöhende Orientierung von Beutel und Bauteil hinsichtlich der Schwerkraft günstig ist. Andererseits kann der Beutel auch mit Klemmen verschiedenster Art auf dem jeweiligen Bauteil festgehalten und angepreßt werden, so daß keinerlei Zwang hinsichtlich der Ausrichtung des zu bearbeitenden Bauteils besteht. Im Falle von Blechbauteilen ist im übrigen ein magnetischer Haftmechanismus besonders vorteilhaft. In der einfachsten Variante kann ein entsprechender Kühlbeutel auch von Hand auf eine abzukühlende Stelle aufgepreßt werden oder der Schwerkraft folgend aufliegen.The pouch can be attached to the paint at the desired location, for example with suction cups attached to the pouch, and an orientation of the pouch and component which increases the pouch pressure is also favorable with respect to gravity. On the other hand, the bag can also be held and pressed onto the respective component with various types of clamps, so that there is no constraint with regard to the orientation of the component to be processed. In the case of sheet metal components, a magnetic adhesive mechanism is particularly advantageous. In the simplest variant, a corresponding cooling bag can also be pressed onto a point to be cooled by hand or lie on it following gravity.
Schließlich sind, nach einer geeigneten Abkühldauer, die je nach Anwendungsfall durch einige Versuche problemlos ermittelt werden kann, die unter den Kühlbeuteln befindlichen Flächen wunschgemäß abgekühlt und einwandfrei polierbar, wobei die Fehlerbeseitigung dann in aller Regel in einer Polierphase bis zur Wiedererwärmung gelingt. Das erfindungsgemäße Vorgehen ist dabei - wie ohne weiteres nachvollziehbar - insbesondere bei der Fließbandfertigung vorteilhaft, da die entsprechenden Kühlelemente nur einmal aufgesetzt werden müssen, sich dann mit dem Bauteil mitbewegen, bis sie schließlich an der Bearbeitungsstelle wieder zu entfernen sind. Falls erforderlich, kann der Kühl- und Poliervorgang auch öfter wiederholt werden.Finally, after a suitable cooling time, which can be easily determined by a few trials depending on the application, the surfaces underneath the cooling bags are cooled as required and can be polished perfectly, and the fault is then usually corrected in a polishing phase until they are reheated. The procedure according to the invention is - as can be easily understood - particularly advantageous in assembly line production, since the corresponding cooling elements only have to be fitted once, then move with the component until they can finally be removed again at the processing point. If necessary, the cooling and polishing process can also be repeated more often.
Mit dem erfindungsgemäßen Vorschlag ist also eine weitere Möglichkeit für das partielle Abkühlen von Oberflächenbereichen von Werkstücken oder Bauteilen gegeben, das in einer Reihe von Anwendungsfällen besondere Vorteile aufweist.The proposal according to the invention thus provides a further possibility for the partial cooling of surface areas of workpieces or components, which has particular advantages in a number of applications.
Claims (9)
- Method for cooling part areas of larger painted areas for subsequent processing, characterised in that the part areas concerned are subjected to the action of an element with flexible contours designed with suitable dimensions which is first cooled and suitably fixed on the area.
- Method according to claim 1, characterised in that the element with flexible contours is cooled to appropriate temperatures with the aid of a low-temperature liquid gas for example by immersion, application or spraying.
- Method according to one of claims 1 to 2, characterised in that painted part areas, in particular part areas heated by the painting operation, are cooled to a temperature in the region of ambient temperature.
- Method according to one of claims 1 to 2, characterised in that painted part areas, in particular part areas painted with highly elastic paints, are cooled to a temperature of less than 0° to -150°C, preferably to -20 to -60°C.
- Method according to one of claims 1 to 4, characterised in that a bag filled with small solids, preferably with metal balls or metal granulate - e.g. with steel, copper or aluminium granulate, is used as the element with flexible contours.
- Method according to one of claims 1 to 4, characterised in that a flexible container which is filled with a liquid which remains liquid in the relevant temperature ranges, e.g. calcium chloride brine, is used as the element with flexible contours.
- Method according to one of claims 1 to 6, characterised in that the element with flexible contours is fixed to the site of its cooling effect with the aid of magnets.
- Method according to one of claims 1 to 6, characterised in that the element with flexible contours is held at the site of its cooling effect with the aid of gravity, suction cups or adhesive elements.
- Method according to one of claims 1 to 6, characterised in that the element with flexible contours is fixed or held at the site of its cooling effect with the aid of additional implements, e.g. clips.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4238013 | 1992-11-11 | ||
| DE4238013A DE4238013A1 (en) | 1992-11-11 | 1992-11-11 | Process for cooling surface parts |
| PCT/EP1993/002241 WO1994011152A1 (en) | 1992-11-11 | 1993-08-20 | Method of cooling parts of surfaces |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0668811A1 EP0668811A1 (en) | 1995-08-30 |
| EP0668811B1 true EP0668811B1 (en) | 1996-12-11 |
Family
ID=6472588
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP93919125A Expired - Lifetime EP0668811B1 (en) | 1992-11-11 | 1993-08-20 | Method of cooling parts of surfaces |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0668811B1 (en) |
| AT (1) | ATE146110T1 (en) |
| DE (2) | DE4238013A1 (en) |
| WO (1) | WO1994011152A1 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01295751A (en) * | 1988-03-15 | 1989-11-29 | Linde Ag | Method and device for grinding and/or polishing lac coated section at temperature lower than atmospheric temperature |
| DE3819973C1 (en) * | 1988-06-11 | 1988-12-29 | Bayerische Motoren Werke Ag, 8000 Muenchen, De | |
| EP0391148B1 (en) * | 1989-04-01 | 1994-06-01 | Messer Griesheim Gmbh | Polishing or grinding device |
-
1992
- 1992-11-11 DE DE4238013A patent/DE4238013A1/en not_active Withdrawn
-
1993
- 1993-08-20 WO PCT/EP1993/002241 patent/WO1994011152A1/en active IP Right Grant
- 1993-08-20 EP EP93919125A patent/EP0668811B1/en not_active Expired - Lifetime
- 1993-08-20 DE DE59304766T patent/DE59304766D1/en not_active Expired - Fee Related
- 1993-08-20 AT AT93919125T patent/ATE146110T1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| WO1994011152A1 (en) | 1994-05-26 |
| DE4238013A1 (en) | 1994-05-19 |
| ATE146110T1 (en) | 1996-12-15 |
| EP0668811A1 (en) | 1995-08-30 |
| DE59304766D1 (en) | 1997-01-23 |
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