EP2175689A1 - Verfahren und Anlage für die Reinigung von Metallteilen - Google Patents

Verfahren und Anlage für die Reinigung von Metallteilen Download PDF

Info

Publication number
EP2175689A1
EP2175689A1 EP07447063A EP07447063A EP2175689A1 EP 2175689 A1 EP2175689 A1 EP 2175689A1 EP 07447063 A EP07447063 A EP 07447063A EP 07447063 A EP07447063 A EP 07447063A EP 2175689 A1 EP2175689 A1 EP 2175689A1
Authority
EP
European Patent Office
Prior art keywords
coil
temperature
carriage
metal part
installation
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.)
Withdrawn
Application number
EP07447063A
Other languages
English (en)
French (fr)
Inventor
Paul Hacourt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to EP07447063A priority Critical patent/EP2175689A1/de
Publication of EP2175689A1 publication Critical patent/EP2175689A1/de
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/101—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/06—Control, e.g. of temperature, of power
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/07—Heating plates with temperature control means

Definitions

  • the invention relates to a method for cleaning metal parts whose surface is contaminated with an organic material. It relates more particularly to the cleaning of dies, screws and sleeves of extruders contaminated by deposits of polymeric material.
  • Extrusion is a well-known implementation technique of various materials, especially thermoplastic materials. It is based on the rotation of a worm, commonly called Archimedean screw, placed in a sheath.
  • Archimedean screw placed in a sheath.
  • the sheath is heated to a temperature above the softening temperature of the polymer to be extruded.
  • the polymer located between the screw and the sleeve is heated and softened by conduction with the sleeve and also following the shear caused by the relative movement of the screw and the sheath.
  • the softened polymer adheres to the inner surface of the sheath.
  • the rotation of the screw therefore causes a thrust on the polymer which puts it under pressure which allows its passage through the tooling implementation, such as a die, for example.
  • the aim of the invention is to provide a process for cleaning metal parts contaminated with organic materials, in particular extruder screws contaminated with polymers, which is faster and easier to implement and reduces the risk of deformation of the treated parts. .
  • the invention relates to a method for pyrolytically removing organic substances contaminating the surface of a metal part by which a coil generating a high frequency electromagnetic field is displaced relative to the metal part so as to cause induction heating. of the contaminated surface.
  • the high frequency electromagnetic field generated in the vicinity of the workpiece causes the appearance of induced currents. Following the film effect, these currents are concentrated on a thin surface layer of the workpiece. This layer is thinner as the frequency of the electromagnetic field is high. It is recommended that the frequency of the electromagnetic field be between 1 kHz, preferably 10 kHz and 1000 kHz, more preferably between 100 and 500 kHz. Dissipation induced currents cause the desired heating for pyrolysis. It is therefore not necessary to heat the entire thickness of the room. This results in a saving of time and a reduction of the risk of deformation of the workpiece.
  • the coil generating the electromagnetic field is displaced relative to the metal part during the process.
  • the coil has dimensions reduced compared to the workpiece.
  • the volume of its outer envelope (the smallest volume that contains it) is at least 5 times, preferably 10 times, more preferably 20 times smaller than the external volume of the workpiece.
  • the coil also has a structure adapted to the shape of the metal part to be cleaned, so as to generate the most appropriate electromagnetic fields. These characteristics make it possible to generate fields in a very local and precise manner, which improves the quality of the cleaning obtained.
  • Organic substances can be decomposed by pyrolysis by means of the process according to the invention.
  • the process according to the invention is particularly useful when the organic substances comprise one or more polymers.
  • Polymers which can advantageously be treated by the process according to the invention are, for example: polyvinyl chloride, polyolefins such as polyethylene, polypropylene, polyamides, fluorinated polymers, graft polymers, etc.
  • the temperature at which the surface of the workpiece is to be heated depends on the organic material and in particular its decomposition temperature by pyrolysis. It is desirable that the temperature and duration of the heating be sufficient to achieve complete decomposition, so that residues can be removed by simple brushing. It is generally recommended that this temperature is at least 400 ° C., preferably 450 ° C., more preferably 500 ° C.
  • the decomposition by pyrolysis of organic materials can generate gaseous emissions that are toxic for the environment.
  • the fumes generated by the pyrolysis are aspirated and treated before emitting them into the atmosphere.
  • the temperature of the part subjected to the electromagnetic field is measured and the magnitude of said field and / or the speed of the displacement of the coil, in function of the measured temperature.
  • the method according to the invention can be applied to the cleaning of metal parts of various shapes, provided that the shape of the coil producing the electromagnetic field, which is displaced relative to the metal part, has a suitable shape.
  • the metal part is an extrusion die.
  • the coil be of sufficiently small dimensions to be introduced into the die.
  • the coil will be thin and flat, for dies producing films and plates, or filiform, for dies producing son or profiles.
  • the metal part to be cleaned is elongate and substantially cylindrical.
  • the metal part to be cleaned is elongate and substantially cylindrical.
  • the smallest cylinder that can hold it has a length of at least 5 times, preferably 10 times, more preferably 20 times its equivalent diameter.
  • the displacement of the coil, also cylindrical is particularly easily along the part to be cleaned. Depending on whether the latter is concave or convex, the coil will enter the room or surround it.
  • the metal part is an extruder sheath.
  • the coil is advantageously compact and structured so that the electromagnetic fields it generates are maximum on its outer perimeter. The coil is then introduced into the sheath and moved along its axis.
  • the part comprises at least one extruder screw.
  • the coil is cylindrical so as to surround the screw or screws.
  • the coil is structured so that the electromagnetic fields it generates are maximum on its inner perimeter, close to the outer surface of the screw to be treated.
  • the method according to the invention allows a fast and efficient cleaning of contaminated metal parts, which reduces their downtime and therefore the cost of cleaning.
  • the carriage carries an optical pyrometer which is directed towards the center of the coil and which is connected to a device for regulating the speed of movement of the carriage.
  • the function of the pyrometer is to measure the temperature of the part in the vicinity of the coil and to control the regulating device so as to continuously adjust the forward speed of the coil to achieve on the surface of the treated part an optimum pyrolysis temperature, without overheating.
  • the optical pyrometer is advantageously an infrared pyrometer.
  • the carriage carries, further downstream of the coil, at least one brush intended to act on the part, when it is on the frame.
  • the term "downstream" is considered in relation to the direction of movement of the carriage during the implementation of the method.
  • the brush is intended to act on the surface of the part to remove the residues from the pyrolysis. Brushing is recommended before complete solidification of the residues.
  • the carriage also carries a camera which controls an angular positioner of the coil, via a regulating device.
  • This embodiment of the installation according to the invention makes it possible to optimize at any moment the orientation of the coil according to the geometric profile of the treated metal part.
  • the two screws of a counter-rotating twin-screw extruder were simultaneously cleaned by moving a spool 5 placed around the screws parallel to the direction of the length of the screws.
  • the screw surface was contaminated with polymeric deposits including polyethylene.
  • the coil was powered by a high frequency generator 2 via power cables whose length was optimized to have the best impedance matching between the transmitter (coil) and the receiver (screw), which increases the fraction of energy produced by the generator actually transmitted to the treated part.
  • the coil 5 has been surrounded by an enclosure 1 for confining the gases emitted during the pyrolysis. These fumes were sucked into a pipe 3, for their treatment and evacuation. At the end of the pyrolysis, the decomposed polymeric deposits were easily brushed by means of a wire brush 4.
  • the installation schematized at figure 2 is specially designed for cleaning, by pyrolysis, a variable pitch extrusion screw 7, of the type commonly used for the extrusion of plastics.
  • the installation comprises a frame 6 for supporting the extrusion screw 7 horizontally.
  • the frame 6 further carries a carriage 8, movable horizontally facing the screw 7.
  • the carriage 8 is moved by rotation of an Archimedean screw 9 coupled to an electric motor 12 and cooperating with a pinion (not shown ) of the carriage 8.
  • the carriage 8 carries an induction coil 5 electrically coupled to the high frequency generator 2.
  • the coil 5 is disposed on the carriage 8, so that it passes through the extrusion screw 7. It comprises for example three turns substantially contiguous. The number of turns of the coil 5 is however not critical for the definition of the invention.
  • the carriage 8 also carries a pair of rotating metal brushes 4. These are arranged downstream of the coil 5, with respect to the direction of travel of the carriage 8 during the treatment of the extrusion screw 7.
  • the two brushes 4 have the function of eliminating the organic residues resulting from the pyrolysis of the extrusion screw 7.
  • the carriage 8 also carries an infrared pyrometer 10 which is oriented towards the surface of the screw 7, so as to be constantly focused on an area of the screw 7, which is circumscribed by the turns of the coil 5.
  • the pyrometer 10 is connected to a regulating device 13, connected to the motor 12.
  • the regulating device 13 regulates the rotational speed of the motor 12 (and consequently the speed of displacement of the coil 5 along the extrusion screw 7) in response to a received signal from the pyrometer 10.
  • the regulating device can also adjust the speed rotation of the motor 14 for driving the brushes 4.
  • the installation of the figure 2 further comprises a camera 15 whose function is to measure the angle of the thread of the screw 7 in the area thereof, which is circumscribed by the coil 5.
  • the camera 15 controls, through the control device 13, an angular positioner 16 so as to orient the turns of the coil 5 substantially parallel to the thread of the screw 7.
  • This embodiment of the invention is specially adapted to the treatment of variable pitch screws.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Cleaning In General (AREA)
EP07447063A 2007-11-14 2007-11-14 Verfahren und Anlage für die Reinigung von Metallteilen Withdrawn EP2175689A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07447063A EP2175689A1 (de) 2007-11-14 2007-11-14 Verfahren und Anlage für die Reinigung von Metallteilen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07447063A EP2175689A1 (de) 2007-11-14 2007-11-14 Verfahren und Anlage für die Reinigung von Metallteilen

Publications (1)

Publication Number Publication Date
EP2175689A1 true EP2175689A1 (de) 2010-04-14

Family

ID=40427520

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07447063A Withdrawn EP2175689A1 (de) 2007-11-14 2007-11-14 Verfahren und Anlage für die Reinigung von Metallteilen

Country Status (1)

Country Link
EP (1) EP2175689A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102564638A (zh) * 2011-12-06 2012-07-11 天津市环欧半导体材料技术有限公司 一种感应加热线圈温度分布的表征方法

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE451329A (de) *
US2376514A (en) * 1937-01-21 1945-05-22 Budd Induction Heating Inc Heat-treating apparatus
GB828761A (en) * 1957-02-26 1960-02-24 Asea Ab Induction device for heating an axially symetrical hollow cylindrical work-piece
GB2192294A (en) * 1986-06-30 1988-01-06 Electricity Council Method of heating
US5738725A (en) * 1995-05-15 1998-04-14 Fuseco., Inc. Cooling system for apparatus of coating an inside of a pipe or tube
EP1002580A2 (de) * 1998-11-18 2000-05-24 Haldor Topsoe A/S Verfahren zur Herstellung eines Gegenstandes mit katalytischer Oberflächenschicht
EP1280382A2 (de) * 2001-07-23 2003-01-29 Ken Kansa Hochfrequenz-Induktionsheizungsvorrichtung und Vorrichtung und Verfahren zur Pyrolyse von organischen Verbindungen die benützen diese Heizvorrichtung
FR2901450A1 (fr) * 2006-05-17 2007-11-23 Solvay Procede de nettoyage de pieces metalliques

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE451329A (de) *
US2376514A (en) * 1937-01-21 1945-05-22 Budd Induction Heating Inc Heat-treating apparatus
GB828761A (en) * 1957-02-26 1960-02-24 Asea Ab Induction device for heating an axially symetrical hollow cylindrical work-piece
GB2192294A (en) * 1986-06-30 1988-01-06 Electricity Council Method of heating
US5738725A (en) * 1995-05-15 1998-04-14 Fuseco., Inc. Cooling system for apparatus of coating an inside of a pipe or tube
EP1002580A2 (de) * 1998-11-18 2000-05-24 Haldor Topsoe A/S Verfahren zur Herstellung eines Gegenstandes mit katalytischer Oberflächenschicht
EP1280382A2 (de) * 2001-07-23 2003-01-29 Ken Kansa Hochfrequenz-Induktionsheizungsvorrichtung und Vorrichtung und Verfahren zur Pyrolyse von organischen Verbindungen die benützen diese Heizvorrichtung
FR2901450A1 (fr) * 2006-05-17 2007-11-23 Solvay Procede de nettoyage de pieces metalliques

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102564638A (zh) * 2011-12-06 2012-07-11 天津市环欧半导体材料技术有限公司 一种感应加热线圈温度分布的表征方法
CN102564638B (zh) * 2011-12-06 2013-05-22 天津市环欧半导体材料技术有限公司 一种感应加热线圈温度分布的表征方法

Similar Documents

Publication Publication Date Title
EP3352974B1 (de) System und verfahren zur generativen fertigung durch laserschmelzen eines pulverbetts
EP2861399B1 (de) Verfahren und vorrichtung zum vorwärmen einer form, insbesondere zum spritzgiessen
WO2005002764A1 (fr) Dispositif de realisation de couches minces de poudre notamment a hautes temperatures lors d'un procede base sur l'action d'un laser sur de la matiere
EP0104109A1 (de) Plasmabögen
FR2760680A1 (fr) Systeme d'assemblage d'elements tubulaires thermoplastiques
EP0524121A1 (de) Einrichtung zum Entmanteln der mit einem isolierendem oder schutzendem Schicht überzogener Leiteroberfläche
CN101568746A (zh) 用于处理金属条带的方法、连续金属条带和使用了该金属条带的推带
CH627668A5 (fr) Procede et dispositif de surmoulage de surfaces en materiau thermoplastique, notamment de semelles de skis.
EP3015175A1 (de) Vorrichtung zur vorbereitung der oberfläche eines werkstücks aus der ferne
EP0107747A1 (de) Verfahren zum Herstellen von zylinderförmigen keramischen Rohren mit lokalisierten Eindrücken und Vorrichtung zur Durchführung dieses Verfahrens
WO1998000284A1 (fr) Procede de traitement de surface par voie seche et dispositif pour la mise en oeuvre d'un tel procede
FR2487696A1 (fr) Appareil de traitement continu sous vide
FR2679477A1 (fr) Procede de decoupe par faisceau laser d'un materiau recouvrant un substrat et dispositifs pour sa mise en óoeuvre.
EP3488990B1 (de) Extrusionsanlage mit einem steuerungssystem zur erfassung einer anomalie und eines verfahrens
FR2901450A1 (fr) Procede de nettoyage de pieces metalliques
EP0779525A1 (de) Vorrichtung für die Einkopplung eines Leistungslaserstrahls in eine optische Faser
EP0490756B1 (de) Verfahren zur Herstellung eines aus einem bei Umgebungstemperatur nicht-schmiedbaren Material bestehenden Teiles, und entsprechendes Werkzeug
WO2002053305A1 (fr) Dispositif et procede de realisation de raccordements traversant sur des dispositifs d'echappements
EP2572821B1 (de) Vorrichtung, die die Verwendung einer Laserquelle im Innern eines begrenzten Behälters ohne Kontamination dieser Quelle durch die Verwendung eines Ärmels ermöglicht
CA2153772C (fr) Procede et installation de fabrication de rubans metalliques amorphes par hypertrempe
FR2857614A1 (fr) Procede de decoupe d'un film fonctionnel en matiere plastique, applique sur un substrat, tel qu'une plaque de verre
WO2003074199A2 (fr) Procede de photopolymerisation d'un revetement polymerisable, installation pour la mise en oeuvre de de procede et produit portant un revetement obtenu
FR2770793A1 (fr) Usinage de tole sans elevement de matiere, par etirage
EP0056541A1 (de) Messerhalter zum Bearbeiten zylindrischer Werkstücke und spanabhebende Vorrichtung mit solchem Messerhalter
WO2006097133A1 (fr) Dispositif et procede de decapage a buse par projection d'un fluide charge de particules solides formant un front de decapage optimise

Legal Events

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

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR MK RS

17P Request for examination filed

Effective date: 20101011

AKX Designation fees paid

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20120601