EP1930482A2 - Heated electric polishing device - Google Patents

Heated electric polishing device Download PDF

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Publication number
EP1930482A2
EP1930482A2 EP07120055A EP07120055A EP1930482A2 EP 1930482 A2 EP1930482 A2 EP 1930482A2 EP 07120055 A EP07120055 A EP 07120055A EP 07120055 A EP07120055 A EP 07120055A EP 1930482 A2 EP1930482 A2 EP 1930482A2
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EP
European Patent Office
Prior art keywords
bath
heating
current
polishing
electropolishing
Prior art date
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Granted
Application number
EP07120055A
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German (de)
French (fr)
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EP1930482B1 (en
EP1930482A3 (en
Inventor
Erfindernennung liegt noch nicht vor Die
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Bego Bremer Goldschlagerei Wilh Herbst & Co KG GmbH
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Bego Bremer Goldschlagerei Wilh Herbst & Co KG GmbH
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Priority to DE200620017090 priority Critical patent/DE202006017090U1/en
Application filed by Bego Bremer Goldschlagerei Wilh Herbst & Co KG GmbH filed Critical Bego Bremer Goldschlagerei Wilh Herbst & Co KG GmbH
Publication of EP1930482A2 publication Critical patent/EP1930482A2/en
Publication of EP1930482A3 publication Critical patent/EP1930482A3/en
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    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25FPROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F7/00Constructional parts, or assemblies thereof, of cells for electrolytic removal of material from objects; Servicing or operating
    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25DPROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D21/00Processes for servicing or operating cells for electrolytic coating
    • C25D21/02Heating or cooling

Abstract

The invention relates to an electropolishing apparatus, comprising a bath container for receiving an electrically conductive bath liquid, in which objects to be polished are immersed, a polishing current source having a first electrical electrode connection for electrical connection to one or more objects to be polished and an electrode electrically connected to the bath liquid, and a heater for heating the bath. According to the invention, the heater comprises a heating current source which supplies a heating circuit with current via two heating electrodes electrically connected to the bath liquid, the heating electrodes being arranged such that a part of the heating circuit is formed by at least a partial volume of the bath liquid when the bath liquid is in the bath container and the heating power source is an AC power source having a frequency of more than 500Hz.

Description

  • The invention relates to an electropolishing apparatus, comprising a bath container for receiving an electrically conductive bath liquid, in which objects to be polished are immersed, a polishing current source having a first electrical electrode connection for electrical connection to one or more objects to be polished and an electrode electrically connected to the bath liquid, and a heater for heating the bath.
  • Such electropolishing devices are used in a number of applications to polish products of an electrically conductive material by means of a so-called electrolytic polishing treatment. For this purpose, the objects are electrically connected as an anode to a power source and immersed in a galvanic bath. The galvanic bath may contain, for example, sulfuric acid, phosphoric acid or other acids and mixtures of these acids and is electrically conductive. The galvanic bath is electrically connected to an electrode connected as a cathode. This cathode may be through a surface electrode, a differently shaped electrode or the container for the galvanic bath itself will be presented. By the flow of a direct current or a pulsed direct current roughness peaks of the objects to be polished are removed and thereby causes the polishing process.
  • Out DE 32 10 315 C2 is a method of electrolytic Glänzbehandlung known which operates according to the principle described above and in which the bath container is equipped with cooling coils and a bath heater.
  • In the embodiment of such electropolishing with a bath heating is a training, which allows a more efficient and thus temporally shortened polishing process. Out DE 33 00 650 C2 It is known to operate an electropolishing by means of an electrolyte solution having a temperature of 70 to 80 ° C. Out DE 44 01 896 is another gleaming device of the type mentioned previously known.
  • Out EP 1 384 448 a device for the electrodeposition of metallic dental moldings is known, which comprises an anode connected to an electrical supply unit and cathode, which are immersed in a filled with an electrolyte bath beaker. This electrolyte bath is heated by means of an infrared radiator in order to achieve a favorable, elevated bath temperature.
  • Prior art electropolishing apparatus have a heating device in the form of a heating element immersed in the bath, which is designed as a resistance heating element. Although it can be kept constant with such resistance heating once a raised bath temperature, a major disadvantage of such a heating is that the heating of the polishing bath from room temperature to the operating temperature of typically over 50 ° C takes a lot of time, typically two hours ,
  • Although the heating process can be optimized with such resistance heating elements by the contact area is increased to the polishing bath, but this leads to undesirably large dimensions of the resistance heating and consequently a low capacity for polishing objects to be polished.
  • Furthermore, the heating power of a resistance heating element can be improved by increasing the temperature of the resistance heating element itself. However, limits are set for this optimization approach, since decomposition and / or vaporization of the polishing bath take place to an undesired extent in the immediate vicinity of the surface of the resistance heating element above a certain limit temperature of the resistance heating element.
  • The invention has for its object to provide a heater which reduces the aforementioned problems and preferably avoids.
  • According to the invention, an electropolishing device of the aforementioned type is provided in which the heater comprises a heating current source which supplies a heating circuit via two heating electrodes electrically connected to the bath liquid, wherein the heating electrodes are arranged so that a part of the heating circuit through at least a partial volume Bath liquid is formed when the bath liquid is in the bath tank and the heating current source is an AC power source with a frequency of more than 500Hz.
  • The heater according to the invention thus avoids the disadvantages of known bath heaters by the polishing bath itself is integrated into a heating circuit, which serves the bath heating. This is achieved by connecting each of the two outputs of the heating current source to one electrode each and immersing these two electrodes at a distance from one another in the polishing bath. A voltage applied to these electrodes will thus cause current to flow through the polishing bath, thereby heating the bath volume between the electrodes. With the heater according to the invention can thus be applied directly to a large volume of the polishing bath without the need to use large heating elements, the heating effect.
  • A specific problem in the heating of electrically conductive baths by means of a current flowing between two electrodes through the bath current is the unwanted decomposition of the bath liquid by the heating current. This Decomposition causes a reduction in the desired functionality of the bath liquid, so for example the polishing effect, in other applications, such as a galvanic bath, but also the galvanic coating effect.
  • Although it is known that a reduction in function can be counteracted by decomposition of the bath, for example, by extending the residence time of the objects to be processed in the bathroom, or the applied polishing voltage or galvanic voltage is increased, but other disadvantages are accepted, such as For example, an extended processing time, increased bath heating and a reduced quality processing result.
  • According to the invention, these disadvantages are remedied by using an alternating current as the heating current, which has a frequency of more than 500 Hz. Surprisingly, it has been found that the decomposition can be significantly reduced or completely avoided by alternating currents with the frequency range defined in this way. AC currents having lower frequencies than the specified range are not suitable for reducing or avoiding unwanted bath degradation. In this case, it is particularly preferred if the frequency of the heating current is more than 4 kHz, in particular more than 15 kHz or 20 kHz, since this can virtually completely avoid bath decomposition.
  • The principle of the heater according to the invention is particularly suitable for electropolishing, thereby allowing a short heating of the polishing bath from room temperature to operating temperature. Thus, it is not necessary to keep the polishing bath for a long time at operating temperature, but it can cool down again after each polishing, since the long heating times of known polishing baths are shortened to a few minutes. The principle of the heater used in the electropolishing according to the invention is therefore in principle also suitable for other devices in which an electrically conductive bath must be heated, for example, for devices for electrodeposition such as electroplating baths for gold deposition and the like.
  • According to a first preferred embodiment, the polishing current source is a DC source or a pulsed DC source. This training is based on the recognition that the required for the electropolishing effect occurs particularly effectively with direct current. A specific problem in systems for electropolishing or other similar systems, such as galvanic systems, is that the power sources depending on the surfaces to be processed have to deliver different services. Basically, as the area of the objects to be machined increases, the resistance decreases and the current required for processing increases accordingly. Typically, however, these systems must be suitable for processing objects with very different sizes of the surfaces to be processed. It is known to design the power sources for the typical maximum area to be processed in the bathroom, but this interpretation is on the one hand costly and on the other hand does not meet the requirements, if exceptionally once polished objects with larger surfaces to be machined, galvanized or the like ,
  • This disadvantage is helped by the embodiment developed here by counteracting an overload of the current source and the concomitant reduction of the current intensity with a corresponding reduction in the quality of the work result by a pulsed operation of the current. As a result, systems for polishing treatment or galvanic deposition can advantageously be tuned to the most frequently occurring in practice operating point or the most frequently occurring in practice area sizes to operate at such area sizes in constant DC operation and only when these area sizes is exceeded switched to pulsed operation to prevent overloading the power source and ensure consistent machining quality.
  • In this case, it is particularly preferred if the polishing current source is coupled to a polishing current control unit which is designed to form the polishing current as a constant direct current or pulsed direct current as a function of the polishing current resistance. By means of such a polishing flow control unit an automatic adjustment can be achieved in such a way that the polishing current source is switched from the constant operation to the pulsed operation, if required by the size of the surface to be processed and also the pulse duration and / or pulse frequency are adapted to the load and performance of the power source , In particular, such a regulation may include switching over to pulsed operation when a certain size of the surface to be processed is exceeded, or switching to pulsed operation when a certain temperature of the bath is exceeded, and also in steps of further increasing the area to be treated or the bath temperature is adjusted in terms of pulse duration and pulse rate.
  • It is further preferred if a polishing current control unit is provided and configured to reverse-polish the polishing current at regular time intervals for a duration of a short pulse, in particular a duration of less than 50 ms. A specific problem in polishing, but also in galvanic deposition processes, is the formation of gas bubbles within the bath on the surfaces to be processed. In the area of such adhering gas bubbles there is no regular processing and this can adversely affect the quality of the processing result. According to the invention, this disadvantage is remedied with the preferred embodiment described above by reversing the machining current, ie the polishing current, at regular time intervals at regular time intervals. By this Umpolvorgang a replacement of the gas bubbles takes place and the processing result can thus be upgraded in quality. The time intervals can be constant, for example, but they can also be calculated as a function of the integrated over the processing time machining current, depending on the bath state or combinations thereof.
  • Furthermore, it is preferred that the heating current source is an alternating current source with a frequency of more than 4 kHz, preferably more than 15 kHz, in particular more than 20 kHz. This training is based on the one hand, the knowledge that by heating with an alternating current with a frequency above 4kHz can be avoided that components of the heating electrodes detach in the polishing or decomposition of the bath occurs. On the other hand, in particular frequencies above 15 kHz or even above 20 kHz are preferred, since in this frequency range no perceptible to human hearing vibrations are generated and thus an acoustic annoyance is avoided.
  • According to a further, particularly preferred embodiment, the two heating electrodes are each arranged adjacent to a wall portion of the bath container and are located opposite to the center of the bath volume. This development of the invention is based on the principle that the heater according to the invention is particularly effective especially when the largest possible volume fraction of the polishing bath between the two heating electrodes is arranged so that this large volume is traversed by the heating causing the current. In principle, the arrangement of the heating electrodes could indeed be chosen so that a central electrode is arranged in the middle of the polishing bath and the container wall itself is used as a second heating electrode. As a result, although the entire bath volume would flow through the heating current and consequently heated, however, the central electrode is unfavorable with regard to the arrangement of the objects to be polished. Alternatively, it is therefore also advantageous in certain applications to use two wall sections of the container wall as heating electrodes, wherein the entire container is designed such that a voltage applied to these two wall sections causes a flow of current through the bath and other current flows, for example via the container wall itself. prevented. In particular, however, it is preferable to use two separate electrodes and to arrange them in the vicinity of the container wall, so that the smallest possible bath volume lies between the electrodes and the container wall section and the largest possible bath volume is arranged between the two electrodes.
  • It is particularly preferred if the two heating electrodes are shaped so that the maximum distance between the wall portion of the bath container and the respective heating electrode is minimal. By means of a configuration of the electrodes which is chosen to be congruent with the wall sections, the distance between the electrodes and the wall section can be minimized at each point, and thus an optimum maximization of the bath volume between the two electrodes can be achieved.
  • Furthermore, it is particularly preferred if at least one of the two heating electrodes is formed flat. A flat configuration of the heating electrodes allows a uniform current flow through the bath volume portions through which the heating current flows, since the resistance in the electrodes themselves is considerably lower than the resistance in the polishing bath and thus a large bath volume can be included in the heating current flow by appropriate arrangement of the planar electrodes and at the same time can be achieved that the current paths extend through this bath volume for each area about or exactly the same length between the two electrodes.
  • A further, particularly preferred embodiment of the polishing apparatus according to the invention comprises a current-detecting device connected to the polishing current source, comprising a current measuring device and a time clock coupled thereto for cumulative measurement of the electrical energy.
  • A particular problem in connection with electropolishing of the type mentioned is the monitoring of the quality of the polishing bath. Since on the one hand decomposition and thus chemical changes take place over the service life of a polishing bath in the polishing bath and on the other hand take place evaporations and thus changes in concentration, a polishing bath can not be used indefinitely. The training described above is based on the finding that the quality of the polishing bath is not dependent solely on its operating time, but in particular on the amount of electricity, ie the integrated over the time current or the amount of electrical energy is dependent. According to the invention, therefore, a current-generating device is provided which detects this amount of current and thus makes it possible to make a statement about a degree of deterioration of the polishing bath. The training according to the invention can be used in particular to the, Assess the deterioration of a freshly filled polishing bath and replace the bathroom at a certain degree of deterioration or a certain amount of electricity detected and replace it with a fresh bath.
  • In particular, the current generation device according to the invention can be further developed by comprising: a current amount memory for storing the cumulative amount of current, a reset device, in particular a manual reset switch, for zeroing the amount of current stored in the current amount storage, a comparison device for comparing the amount of current stored in the memory with a predetermined maximum amount of current and a signal device coupled to the comparison device which generates an optical or acoustic signal when the amount of current stored in the memory reaches or exceeds the predetermined maximum current amount. This training makes it possible to carry out a largely automated bath monitoring by zeroing a stored amount of current when filling a fresh bath, this amount of current is continuously increased and stored in response to the temporally flowing currents and the stored current value is compared with a predetermined maximum value to determine whether the maximum value has already been reached or even exceeded and then a signal for replacing the polishing bath is given. The used for this purpose electricity storage unit detects the cumulative amount of electricity and must be designed to have noted this amount of electricity again after switching off and on the polishing device in the memory.
  • The comparator may for example be an optical comparison display, but preferably a comparator integrated in an electrical component, which compares two input signals with each other and outputs a difference value as an output signal, which is preferably numerically, i. executed by software in a microprocessor.
  • It is furthermore preferred if the signal device corresponds to a quantity of current stored in the memory or to the difference between the amount of current stored in the memory and the predetermined maximum amount of current Signal outputs. In this way, the user of the electropolishing device according to the invention is given an estimate of the quality of the polishing bath and the remaining operating time. For example, the display may consist of a remaining run time calculated based on an estimated average current value or an accurately calculated residual current value. In a simplified embodiment, a warning light may also be provided to indicate a spent bath.
  • Furthermore, it is preferable if the heating current source is coupled to a control device, which is coupled to a thermal sensor for detecting the temperature of the polishing bath and is designed to control the heating current so that a predetermined bath temperature is set and maintained , With this training, it is possible to keep the bath temperature in an ideal temperature range or at an ideal temperature value and to heat it up to room temperature after starting up the electropolishing unit. The heat sensor can be embodied, for example, directly as a thermal sensor immersed in the bath or as a heat sensor corresponding to the error-corrected heat sensor.
  • Furthermore, it is preferable if at least one heating electrode and one polishing electrode are formed by a single electrode. By this development, an electrode of the electropolishing device according to the invention can be saved.
  • Finally, it is preferable to train the electropolishing device according to the invention by means of a stirring device for circulating the polishing bath. This stirring device can be embodied, for example, as a magnetic stirrer or circulating pump and serves essentially to compensate for temperature gradients in the polishing bath, which may be caused by local heating processes, for example, or differences in concentration in the polishing bath, which can be caused, for example, by local evaporation processes, by continuously mixing the bath volume fractions become.
  • A further aspect of the invention is a heating device for an electrically conductive bath, comprising a heating current source, which supplies a heating circuit with current via two heating electrodes electrically connected to the bath liquid, wherein the heating electrodes are arranged so that a part of the heating circuit through at least a partial volume of Bath liquid is formed when the bath liquid is in the bath tank and the heating current source is an AC power source with a frequency of more than 500Hz.
  • The electropolishing apparatus according to the invention preferably operates according to a method for electropolishing with the following steps: heating an electrically conductive electropolishing bath to a predetermined temperature, immersing one or more objects to be polished in the electropolishing bath, applying a voltage between the object to be polished or the objects to be polished and a counterelectrode connected to the electropolishing bath, characterized in that the heating of the electropolishing bath takes place by applying an alternating voltage to two electrodes immersed in the electropolishing bath.
  • Preferred embodiments of the invention will be explained with reference to the figures. Show it:
    • Fig. 1 shows a first embodiment of an electropolishing system according to the invention, and
    • 2 shows a second embodiment of an electropolishing system according to the invention.
  • FIG. 1 shows a bath container 10 in which a polishing bath 20 is filled. In the polishing bath 20, an object to be polished 30 is immersed and is held by means of an electrically conductive support rod 31 on a device-side mounting plate 32. To the support rod 31, a power line 32 is electrically connected, which is connected to a pole of a polishing power source 40. The other pole of the polishing current source 40 is electrically connected to the bottom wall 11 of the polishing bath container 10 via a connecting line 34.
  • By this arrangement can be applied between the object to be polished 30 as the first electrode and the container wall 11, 12, 13 of the container 10 as a second electrode, a voltage that causes a current flow through the polishing bath 20, a galvanic polishing by electrolytic release of atomic or molecular components from the surface of the object 30 to be polished.
  • In the power line 34, a current generation device 50 is turned on, which includes an ammeter 51 and a timer 52. Ammeter 51 and timer 52 are coupled together to calculate a time-integrated amount of current in the current generator and to store it in memory. The thus calculated current is compared within the current generator 50 with a stored maximum value and the difference between the formulated current value and the maximum value is displayed on a display 54. In addition, a warning light (55) indicates a used up bath.
  • The accumulated current value is stored in a memory within the current generator. The stored value can be set to zero, preferably via a reset button 53.
  • On the two side walls 12 and 13 of the bath container 10 are each a surface electrode 60, 61 immersed in the polishing bath 20. The surface electrodes 60, 61 extend over the entire side wall 12, 13 of the bath container 10 and face each other. In this way, a large part of the bath volume of the polishing bath 20 is arranged between the electrodes 60, 61.
  • The electrodes 60, 61 are connected via electrical leads 62, 63 to a heating current source 70, which generates an alternating current with an AC frequency of 15 kHz.
  • On the bottom wall 11 of the container 10, a heat sensor 80 is arranged, which is connected via an electrical line 81 to a central control unit 100.
  • The central control / regulation unit 100 comprises a setting wheel 101, on which a desired value for the bath temperature can be set. Furthermore, the control / regulation unit 100 comprises a display 102, on which the actual temperature of the polishing bath 20 detected by the temperature sensor 80 is displayed. Depending on the difference between the setpoint and actual temperature, the control / regulation unit 100 regulates the heating current intensity generated by the heating current source 70 via a control line 71.
  • The control unit 100 further controls the current intensity of the polishing power source 40 via a control line 41.
  • The control unit 100 is further connected via a control line 91 with a magnetic stirrer 90, which comprises a magnetic stirring rod 92 and an electric motor 93 with a driver for the stirring rod 92.
  • FIG. 2 shows a second embodiment of the polishing installation according to the invention. The second embodiment is substantially identical in construction to the first embodiment and corresponding structures and components are designated by the same reference numerals. A description of these structures and components is omitted here.
  • The second embodiment illustrated in FIG. 2 differs from the first embodiment shown in FIG. 1 in that the polishing current source 40 is not electrically connected to the bottom wall of the polishing bath container by means of a connecting line, but rather a connecting line 134 is formed which forms the other pole of the polishing current source electrically connected to a connection point 135. The connection point 135 is electrically connected to the surface electrode 60, which thus serves for bath heating by means of alternating current and as a counterpole for the electropolishing process.
  • With the embodiment shown in Figure 2 can be dispensed with by this embodiment on the one hand to use an electrically conductive pan 11 for the polishing bath, since the tub itself no longer has an electrical function. In the second embodiment, it is provided in particular that heating and polishing process take place alternately to a mutual Preventing the influence of the two effects on the shared area electrode 60.
  • The polishing apparatus according to the invention preferably operates according to the following method:
  • First, after the polisher is started up, the polishing bath is heated by allowing the heating current source 70 to flow current through the electrodes 60, 61 through the polishing bath 20. During the entire warm-up process, the magnetic stirrer 90 is in operation. The bath temperature is continuously measured by means of the temperature sensor 80 and compared in the control unit 100 with the set target value. As soon as an ideal temperature, which is for typical polishing baths between 40 ° C and 50 ° C, is reached, the current intensity of the heating current source 70 is reduced in order to flow only so much current that is required for maintaining the temperature Electricity is reduced in the time average.
  • Either after reaching the desired temperature of the polishing bath or even before the beginning of the heating process, the object to be polished is attached to the rod 31 and lowered into the polishing bath 20. The control device 100 drives the polishing power source 40, which then applies a polishing current to the container wall as a first electrode and the object 30 to be polished as a second electrode. The current flowing between the container wall and the object to be polished is measured via the ammeter 51 and integrated over the time detected by the clock 52. The current value thus calculated is added to a stored current current value and this sum subtracted from a predetermined maximum value and the remaining amount of remaining flow until the required replacement of the polishing bath 20 on the display 54 is displayed. Alternatively, it is possible to dispense with an indication of the remaining amount of red-flow current and, instead, to signal the required replacement of the polishing bath by a warning lamp if the remaining running time is zero.
  • After the desired surface smoothness of the object to be polished has been reached, the object is removed from the bath and removed from the rod 31.

Claims (17)

  1. Electropolishing device, comprising
    - A bath container (10) for receiving an electrically conductive bath liquid (20), in which objects to be polished (30) are immersed,
    a polishing power source (40) having a first electrical electrode terminal (31) for electrically connecting to one or more objects to be polished and an electrode (11, 12, 13) electrically connected to the bath liquid, and
    a heater (60, 61, 70) for heating the bath,
    characterized in that the heater comprises a heating current source (70) which supplies power to a heating circuit (62, 63, 20) via two heating electrodes (60, 61) electrically connected to the bath liquid, the heating electrodes being arranged so that one part of the heating circuit is formed by at least a partial volume of the bath liquid (20) when the bath liquid is in the bath tank and the heating current source is an alternating current source having a frequency of more than 500Hz.
  2. Electropolishing device according to claim 1,
    characterized in that the polishing current source is a DC power source, preferably a pulsed DC power source.
  3. Electropolishing device according to claim 1 or 2,
    characterized in that the polishing power source is coupled to a polishing current control unit configured to form the polishing current as a constant direct current or pulsed direct current depending on the polishing current resistance.
  4. Electropolishing device according to claim 2 or 3,
    characterized in that a polishing current control unit is provided and adapted to reverse-polish the polishing current at regular time intervals for a duration of a short pulse, in particular a duration of less than 50 ms.
  5. Electropolishing device according to one of the preceding claims,
    characterized in that the Heizstromquelle is an AC power source having a frequency of more than 4kHz, preferably more than 15kHz, in particular more than 20kHz.
  6. Electropolishing device according to one of the preceding claims,
    characterized in that the two heating electrodes are each disposed adjacent to a wall portion of the bath tank and are opposed to each other with respect to the center of the bath volume.
  7. Electropolishing device according to the preceding claim,
    characterized in that the two heating electrodes are shaped so that the maximum distance between the wall portion of the bath container and the respective heating electrode is minimal.
  8. Electropolishing device according to one of the preceding claims,
    characterized in that at least one of the two heating electrodes is formed flat.
  9. Electropolishing device according to one of the preceding claims,
    characterized by a current measuring device (50) connected to the polishing power source, comprising a current measuring device (51) and a time clock generator (52) coupled thereto for cumulated measurement of the electrical energy.
  10. Electropolishing device according to the preceding claim,
    characterized in that the current generation device comprises:
    - an electricity storage system for storing the cumulative amount of electricity,
    a resetting device, in particular a manual resetting switch, for resetting the amount of electricity stored in the energy storage device,
    a comparison device for comparing the amount of current stored in the memory with a predetermined maximum amount of current, and
    - A signal device coupled to the comparison device which generates an optical or acoustic signal when the amount of current stored in the memory reaches or exceeds the predetermined maximum amount of current.
  11. Electropolishing device according to the preceding claim,
    characterized in that the signaling device outputs a signal corresponding to the amount of current stored in the memory or to the difference between the amount of current stored in the memory and the predetermined maximum amount of current.
  12. Electropolishing device according to one of the preceding claims,
    characterized in that the heating current source is coupled to a control device coupled to a thermal sensor for detecting the temperature of the polishing bath and adapted to control the heating current so as to set and maintain a predetermined bath temperature.
  13. Electropolishing device according to one of the preceding claims,
    characterized in that at least one heating electrode and polishing electrode are formed by a single electrode.
  14. Electropolishing device according to one of the preceding claims
    characterized by a stirring device for circulating the polishing bath.
  15. A heating device for an electrically conductive bath, comprising a heating current source (70) which, via two heating electrodes (61, 61) electrically connected to the bath liquid, supplies power to a heating circuit (62, 63, 20), the heating electrodes being arranged such that a Part of the heating circuit is formed by at least a partial volume of the bath liquid when the bath liquid is in the bath tank and the heating current source is an AC power source with a frequency of more than 500Hz.
  16. Heating device according to claim 15,
    characterized in that it is developed according to the characterizing part of one of the preceding claims 2-14.
  17. Process for electropolishing with the steps:
    Heating an electrically conductive electropolishing bath (20) to a predetermined temperature,
    Immersing one or more articles (30) to be polished into the electropolishing bath,
    Applying a voltage between the object to be polished or the objects to be polished and a counterelectrode (11, 12, 13) connected to the electropolishing bath,
    characterized in that the heating of the electropolishing bath takes place by applying to two electrodes (60, 61) immersed in the electropolishing bath an alternating voltage having a frequency of more than 500 Hz.
EP20070120055 2006-11-07 2007-11-06 Heated electric polishing device Active EP1930482B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE200620017090 DE202006017090U1 (en) 2006-11-07 2006-11-07 Heated electropolishing device

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EP1930482A2 true EP1930482A2 (en) 2008-06-11
EP1930482A3 EP1930482A3 (en) 2010-02-24
EP1930482B1 EP1930482B1 (en) 2013-01-09

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DE202006017090U1 (en) 2008-03-20
EP1930482B1 (en) 2013-01-09
EP1930482A3 (en) 2010-02-24

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