NL2019444B1 - Heat treatment apparatus - Google Patents

Heat treatment apparatus Download PDF

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Publication number
NL2019444B1
NL2019444B1 NL2019444A NL2019444A NL2019444B1 NL 2019444 B1 NL2019444 B1 NL 2019444B1 NL 2019444 A NL2019444 A NL 2019444A NL 2019444 A NL2019444 A NL 2019444A NL 2019444 B1 NL2019444 B1 NL 2019444B1
Authority
NL
Netherlands
Prior art keywords
heat treatment
sheet
gas bearing
treatment device
blade
Prior art date
Application number
NL2019444A
Other languages
Dutch (nl)
Inventor
Kaper Gerard
Rudolf Zijlmans Wiro
Original Assignee
Smit Thermal Solutions B V
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 Smit Thermal Solutions B V filed Critical Smit Thermal Solutions B V
Priority to NL2019444A priority Critical patent/NL2019444B1/en
Priority to PCT/NL2018/050553 priority patent/WO2019039943A1/en
Application granted granted Critical
Publication of NL2019444B1 publication Critical patent/NL2019444B1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/28—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity for treating continuous lengths of work
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/63—Continuous furnaces for strip or wire the strip being supported by a cushion of gas

Abstract

1 1 Abstract The invention relates to a heat treatment apparatus for thermal treatment of a sheet, the heat treatment apparatus comprising a chamber provided with an input port for receiving the sheet; an output port for releasing the sheet; transport means arranged 5 to move the sheet from the input port to the output port in a first direction; a gas bearing positioned between the input port and the output port and arranged to guide the sheet from the input port to the output port; and heating elements near the gas bearing arranged to heat the gas when provided to the gas bearing; wherein the gas bearing; the input port and the output port are arranged in a triangle; when viewed in 10 an operation position. Fig. l

Description

Heat treatment apparatus
Field of the invention
The present invention relates to a heat treatment apparatus for thermal processing of a sheet wherein a part of the sheet is temporary heated and cooled according to a predetermined temperature profile, when the sheet is passed through the heat treatment apparatus.
Background art
Such a heat treatment apparatus is known from US 4,401,484. In the known heat treatment apparatus a metal strip is moved through the heat treatment apparatus in a floating manner.
Thereto the known apparatus comprises a first and second plenum chambers opposite to each other. Furthermore, the known heat treatment is provided with device strip curving means in the wall of each of the plenum chambers adjacent to the metal strip and arranged over the entire length of the strip passage within the heat treatment apparatus. A disadvantage of the known device is that the substrate is heated at both sides, where in some heat treatments it is desired that substrates provide with one or more thin film layer of an additional material are thermally treated only at the side of the sheet opposite to that whereon the thin film layers are provided. The sheet can be a metal sheet, a ceramic or glass sheet.
Summary of the invention
It is an object of the invention to provide a heat treatment apparatus where a more accurate temperature profile can be obtained. This object can be achieved by the heat treatment apparatus in accordance with the invention, and is characterized in that the heat treatment apparatus comprises a chamber provided with an input port for receiving the sheet; an output port for releasing the sheet, transport means arranged to move the sheet from the input port to the output port in a first direction; a gas bearing positioned between the input port and the output port and arranged to guide the sheet from the input port to the output port, heating elements near the has bearing arranged to heat the gas when provided to the gas bearing, wherein the input port, the gas bearing and the output port are arranged in a triangle, when viewed in an operation position.
The invention is based on the recognition that heating one side of the substrate may introduce buckles in the moving substrate, for example, a metal sheet. In the new arrangement, the gas bearing is arranged between the input port and the output port, wherein the gas bearing is positioned in a top angle of the triangle formed between the input port and the output port, when viewed in an operation position. Due to the bend induced by the gas bearing in a transverse direction with respect to the moving direction of the substrate buckle forming in the substrate is prevented. Furthermore, the gas flow through the gas bearing towards the sheet provides a counter force to balance a force induced by the tension in the sheet, when moving around the gas bearing. In this way a small distance can be adjusted between a supporting surface of the gas bearing and the sheet. This small distance induces a turbulent flow of gas to the sheet. This turbulent heated gas flow provides an efficient heat transfer to the sheet and enables contactless one-side heating of the sheet.
In a particular advantageous embodiment of the heat treatment apparatus, the gas bearing is provided with a bar directed in a direction transverse to the first direction, the bar is provided with a channel having an inlet for receiving the heated gas and orifices for venting the gas to the sheet.
The bar provides a supporting surface to carry the moving sheet.
In a further embodiment of the heat treatment apparatus the face of the bar directed to the sheet has a rounded shape, when viewed in a second direction transverse to the first direction. The rounded shape provides a smooth, contactless transport of the moving sheet along the air bearing.
In a further embodiment of the heat treatment apparatus a part of the orifices are positioned along a straight line at the face directed to the sheet.
In another embodiment of the heat treatment apparatus, the bar consist of porous material. An advantage of the porous material is that the bar can be manufactured in a simple way. The porous material can comprise stainless steel, ceramics or graphite.
In a still further embodiment of the heat treatment apparatus, the heat treatment apparatus comprises a gas flow controller connected to the gas bearing for adjusting the gas flow through the gas bearing.
In a further embodiment of the heat treatment apparatus the heat treatment apparatus comprises a channel to connect the gas flow controller to the inlet and the heating element is arranged around the channel. In this arrangement the gas flowing to the gas bearing can be heated in an efficient manner.
In a still further embodiment of the heat treatment apparatus, the transport means comprises an input reel positioned near the inlet port and arranged to roll off the sheet and an output reel positioned at the output port and arranged to wind up the sheet. The input reel and the output reel enables processing of a rolled sheet.
In a still further embodiment of the heat treatment apparatus, the transport means comprises a first motor arranged to drive the input reel and a second motor arranged the output reel to move the sheet at a predetermined speed.
In a still further embodiment of the heat treatment apparatus, the heat treatment apparatus further comprises a controller connected to the gas flow controller and the first and second motors, the controller is configured to adjust a gas flow and a speed of the moving sheet. The moving speed can be adjusted in the range between 0.1 m and 6 m per min.
In a still further embodiment of the heat treatment apparatus, the gas bearing comprises a second bar positioned parallel to first bar. In this arrangement a wished temperature change can be imposed on a moving part of the sheet when passing through the gas bearing along the adjacent bars.
In a further embodiment wherein a cross-section of adjacent faces of the first and second bar directed to the sheet are conforming a circle segment. This shape provides a smooth transport of the sheet from one bar to the next bar in the gas bearing.
In a further different embodiment of the heat treatment apparatus, the heat treatment comprises a further gas bearing positioned between the input reel and the gas bearing or the gas bearing and the output reel.
Short description of drawings
The present invention will be discussed in more detail below, with reference to the attached drawings, in which
Fig. 1 schematically shows schematically an embodiment of the heat treatment apparatus according to the invention;
Fig. 2 schematically shows a first embodiment of the gas bearing provided in the heat treatment apparatus according to the invention;
Fig. 3 schematically shows a front view in the longitudinal direction of the bar in a first embodiment of the invention;
Fig. 4 schematically shows a front view in the longitudinal direction of the bar provided in a second embodiment of the invention; and
Fig. 5 schematically shows an example of a graph representing a temperature variation of a sheet passing the heat treatment apparatus.
In the figures like reference numbers indicate like parts.
Description of embodiments
The invention is described with reference to figs. 1 to 5. Fig. 1 shows schematically an embodiment of a heat treatment apparatus according to the invention. The heat treatment apparatus 1 comprises a frame 2 , a chamber 3 defined by a furnace wall 4 and provided with an input port 5 for receiving a sheet 7, and an output port 6 for releasing the sheet 7, wherein the frame supports the chamber. The furnace wall 4 may comprise isolating material.
The sheet can be for example, a metal plate, a ceramic or glass plate. The metal can be for example stainless steel or INOX. The thickness of the plate can be for example in the range between 0.2 and 0.6 mm. The width of the sheet can be for example 40 cm. The sheet can be a roll of metal. The metal can be steel or INOX. One side of the sheet 7 can be provided in an earlier process step with, for example, a semiconductor printed on the sheet. The semiconductor can be for example doped silicon. In the heat treatment apparatus in this description the side of the sheet opposite to that whereon the semiconductor layer is provided, can be heated.
The heat treatment apparatus 1 comprises a gas bearing 8 positioned between the input port 5 and the output port 6 and arranged to guide the sheet 7 from the input port to the output port.
Furthermore, the heat treatment apparatus comprises transport means arranged to move the sheet from the input port to the output port in a first direction. The transport means may comprise an input reel 9 positioned near the inlet port 5 and arranged to roll off the sheet and an output reel 10 positioned at the output port 6 and arranged to windup the sheet. Furthermore, the gas bearing 8 is connected to a gas flow controller 11 via a channel 23.
In this embodiment the gas bearing 8, the input port 5 and the output port 6 are arranged in a triangle, when viewing in an operation position transverse to the moving direction of the sheet. In this arrangement the gas bearing 8 is positioned in a top angle of the triangle formed with the input port 5 and the output port 6. The heat treatment apparatus is based on a flow of heated gas for heating the one side of the sheet directed to the bearing. Furthermore, the gas bearing forms a floating bed for the moving sheet 7.
Advantages of this configuration are that the bend induced by the gas bearing 8 in a transverse direction with respect to the moving direction of the sheet, prevents buckle forming, when the sheet is heated. Furthermore, the small distance in the gas bearing between the supporting surface and the moving sheet provides a turbulent gas flow to the sheet. The turbulent gas flow improves heat transfer from the heated gas to only one side of the sheet. In this configuration the force of the gas flow acting on the moving sheets counterbalances a force induced by the tension of the moving sheet. In an embodiment this force is about ION per meter width of the sheet.
Furthermore, the heat treatment apparatus may comprise a gas flow controller 11 connected to the gas bearing 8 for supplying the gas. The gas flow controller 11 may be connected to a controller 12 arranged to control the gas flow through the gas bearing.
Furthermore, the heat treatment apparatus can be provided with motors 13,14 arranged to drive respectively the input real 9 and the output reel 10. The motors can be electrically connected to the controller 12. The controller is arranged to adjust a speed of the moving sheet and a predetermined tension in the moving sheet by controlling the rotating speed and torque of the respective motors 13, 14. The gap in the gas bearing to the sheet 7 is controlled by the gas flow and the rotating speed and toque of the respective first and second motors. The distance can be smaller than 1.0 mm preferably smaller than 0.8 mm.
In order to obtain a desired temperature variation of a portion of the moving sheet, when the portion of the moving sheet is moving along the gas bearing 8 in the heat treatment apparatus, a temperature of the heating element, the gas flow through the gas bearing and speed of the moving sheet can be adjusted.
Fig. 2 schematically shows a cross-section 20 of the gas bearing 8 provided in the heat treatment apparatus 1 according to an embodiment of the invention. |The gas bearing may comprise one or more bars 21,26,27,28. The first bar 21 is provided with an inlet 24 for gas intake and venting orifices 22 in the face of the bar 21 facing the sheet 7. The venting orifices 22 are connected to the inlet 24 by an inner channel in the bar.
Furthermore, the heat treatment apparatus is further provided with a channel 23 connecting the inlet 24 of the bar 21 to the gas flow controller 11.
Fig. 2 shows also the three further bars 26,27,28 positioned parallel to the first bar 21. The further bars 26,27,28 are similar to the first bar 21.
In this embodiment the bars 26,27,28 can be arranged beside each other in the chamber 4, wherein the faces of the bars directed to the sheet 7 are conforming to a fictive segment of a circle with a predetermined radius to obtain a smooth rounded surface to support the moving sheet 7. The radius of the circle can be for example 500 mm. The apertures between the bars 20,26,27,28 can be used to drain the expelled gas redirected from the sheet.
In this arrangement the heat transport to different portions of the moving sheet can be adjusted by the respective heaters 25 along the channels 23, wherein the gas flows to the further bars 26,27,28, is flowing. So, a predetermined temperature variation in subsequent steps of a desired temperature-time trajectory of the portion of the moving sheet can be obtained.
Fig. 3 schematically a front view in the longitudinal direction of the bar 21 on the face directed to the sheet in a first embodiment of the invention. Fig. 3 shows that the orifices 22 are positioned along a fictive straight line 30 of the face of the bar 21.
Fig. 4 schematically shows a front view in the longitudinal direction of bar 21 provided in the heat treatment apparatus according to a second embodiment of the invention. The bar shown in fig. 4 comprises porous material, e.g. stainless steel, ceramics or graphite. The bar can provided with an inner channel between an inlet and the orifices formed in the face of the bar facing the moving sheet.
Fig. 5 shows an example of a graph representing a temperature time trajectory or variation of a moving sheet passing through the heat treatment apparatus according to an embodiment of the invention. In the heat treatment apparatus the sheet is heated from a first temperature e.g. 100 °C, to respectively 300 0 C and 700 0 C. According to the invention the sheet can be heated rapidly from 300 0 C and 700 0 C without introducing buckling of the sheet.
According to an embodiment the heat treatment apparatus can be provided with further gas bearings between the input reel and the inlet port and/or between the bar and output port to guide the sheet respectively from the input reel to the inlet port and from the output port to the output reel.
In the description of the figures, the invention has been described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the scope of the invention as summarized in the attached claims.
In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
In particular, combinations of specific features of various aspects of the invention may be made. An aspect of the invention may be further advantageously enhanced by adding a feature that was described in relation to another aspect of the invention.

Claims (15)

1. Warmtebehandelingsinrichting voor het thermisch behandelen van een blad, waarbij de warmtebehandelingsinrichting omvat: een kamer, voorzien van een ingangspoort voor het ontvangen van het blad en een uitgangspoort voor het afgeven van het blad; transportmiddelen, ingericht voor het bewegen van het blad van de ingangspoort naar de uitgangspoort in een eerste richting; een gaslager in de kamer, ingericht om het blad te geleiden van de ingangspoort naar de uitgangspoort en verwarmingselementen nabij het gaslager, ingericht om het gas te verwarmen wanneer het wordt verschaft aan het gaslager; waarbij de ingangspoort, het gaslager en de uitgangspoort zijn ingericht in een driehoek, wanneer beschouwd in een bedrijfspositie.A heat treatment apparatus for thermally treating a sheet, the heat treatment apparatus comprising: a chamber provided with an input port for receiving the sheet and an output port for dispensing the sheet; transport means adapted to move the blade from the entrance port to the exit port in a first direction; a gas bearing in the chamber adapted to guide the blade from the entrance port to the exit port and heating elements near the gas bearing adapted to heat the gas when it is supplied to the gas bearing; wherein the entrance port, the gas bearing and the exit port are arranged in a triangle when viewed in an operating position. 2. Warmtebehandelingsinrichting volgens conclusie 1, waarbij het gaslager is voorzien van een balk die gericht is in een richting welke transversaal is ten opzichte van de eerste richting, en de balk is voorzien van een inlaat voor het ontvangen van het verwarmde gas en openingen voor het naar het blad ventileren van het gas.2. The heat treatment device as claimed in claim 1, wherein the gas bearing is provided with a beam which is directed in a direction which is transversal to the first direction, and the beam is provided with an inlet for receiving the heated gas and openings for vent the gas to the blade. 3. Warmtebehandelingsinrichting volgens conclusie 1 of 2, waarbij een vlak van de balk dat naar het blad is gericht een afgeronde vorm heeft wanneer beschouwd in een tweede richting die transversaal is ten opzichte van de eerste richting.A heat treatment device according to claim 1 or 2, wherein a face of the beam facing the blade has a rounded shape when viewed in a second direction that is transversal to the first direction. 4. Warmtebehandelingsinrichting volgens conclusie 2 of 3, waarbij een gedeelte van de openingen is gelegen langs een rechte lijn op het vlak van de balk dat naar het blad is gericht.A heat treatment device according to claim 2 or 3, wherein a portion of the openings is located along a straight line on the plane of the beam that faces the blade. 5. Warmtebehandelingsinrichting volgens conclusie 2 of 3, waarbij de balk poreus materiaal omvat tussen de inlaat en een vlak van de balk dat naar het blad is gericht.A heat treatment device as claimed in claim 2 or 3, wherein the beam comprises porous material between the inlet and a face of the beam facing the blade. 6. Warmtebehandelingsinrichting volgens willekeurig welke van conclusies 1-5, verder omvattend een gasstroombesturingsorgaan dat is verbonden met het gaslager voor het besturen van de gasstroom door het gaslager.A heat treatment device according to any of claims 1-5, further comprising a gas flow controller connected to the gas bearing for controlling the gas flow through the gas bearing. 7. Warmtebehandelingsinrichting volgens willekeurig welke van de voorgaande conclusies, waarbij de warmtebehandelingsinrichting een kanaal omvat voor het verbinden van het gasstroombesturingsorgaan met de inlaat en het verwarmingselement is ingericht rond het kanaal.A heat treatment device according to any of the preceding claims, wherein the heat treatment device comprises a channel for connecting the gas flow controller to the inlet and the heating element is arranged around the channel. 8. Warmtebehandelingsinrichting volgens willekeurig welke van conclusies 1-7, waarbij de transportmiddelen een invoerrol omvatten die gelegen is nabij de inlaatpoort en geschikt is ingericht om het blad af te wikkelen en een uitvoerrol die gelegen is aan de uitgangspoort en geschikt is ingericht om het blad op te wikkelen.A heat treatment device as claimed in any one of claims 1-7, wherein the conveying means comprise an input roll located near the inlet port and adapted to unwind the blade and an output roll disposed at the exit port and suitably arranged about the blade to wind up. 9. Warmtebehandelingsinrichting volgens conclusie 8, waarbij de transportmiddelen een eerste motor omvatten die is ingericht voor het aandrijven van de invoerrol en een tweede motor die is ingericht voor het zodanig aandrijven van de uitvoerrol dat het blad wordt bewogen met een vooraf bepaalde snelheid en spanning.A heat treatment device as claimed in claim 8, wherein the conveying means comprise a first motor adapted to drive the input roll and a second motor adapted to drive the output roll such that the blade is moved at a predetermined speed and tension. 10. Warmtebehandelingsinrichting volgens conclusie 7 en 9, verder omvattend een besturingsorgaan dat is verbonden met het gasstroombesturingsorgaan en de eerste en de tweede motor, waarbij het besturingsorgaan is geconfigureerd voor het bijstellen van de gasstroom, de snelheid en de spanning van het blad.The heat treatment apparatus according to claims 7 and 9, further comprising a controller connected to the gas flow controller and the first and the second engine, the controller being configured to adjust the gas flow, speed and voltage of the blade. 11. Warmtebehandelingsinrichting volgens willekeurig welke van conclusies 1-10, waarbij het gaslager een tweede balk omvat die evenwijdig is gelegen aan de eerste balk.A heat treatment device according to any one of claims 1-10, wherein the gas bearing comprises a second beam that is parallel to the first beam. 12. Warmtebehandelingsinrichting volgens conclusie 11, waarbij de aangrenzende vlakken van de eerste en de tweede balk die naar het blad zijn gericht conform een cirkelsegment zijn.The heat treatment device of claim 11, wherein the adjacent surfaces of the first and second beams that face the blade conform to a circle segment. 13. Warmtebehandelingsinrichting volgens conclusie 12, waarbij de cirkelsegmenten het dezelfde straal hebben.The heat treatment device of claim 12, wherein the circle segments have the same radius. 14. Verwarmingsinrichting volgens willekeurig welke van conclusies 1-13, waarbij de snelheid van het blad bijstelbaar is in een gebied van 0,1-2 meter per minuut.The heater of any one of claims 1-13, wherein the speed of the blade is adjustable in a range of 0.1-2 meters per minute. 15. Warmtebehandelingsinrichting volgens willekeurig welke van conclusies 1-14, omvattend een verder gaslager dat gelegen is tussen de invoerrol en het gaslager of tussen het gaslager en de uitvoerrol.A heat treatment device according to any of claims 1-14, comprising a further gas bearing located between the input roller and the gas bearing or between the gas bearing and the output roller.
NL2019444A 2017-08-24 2017-08-24 Heat treatment apparatus NL2019444B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
NL2019444A NL2019444B1 (en) 2017-08-24 2017-08-24 Heat treatment apparatus
PCT/NL2018/050553 WO2019039943A1 (en) 2017-08-24 2018-08-24 Heat treatment apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL2019444A NL2019444B1 (en) 2017-08-24 2017-08-24 Heat treatment apparatus

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1483378B1 (en) * 1964-09-02 1969-10-23 Stein & Roubaix Societe Anonym Method for guiding metal bands in continuous ovens or the like.

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6056218B2 (en) 1980-01-18 1985-12-09 大同特殊鋼株式会社 Heat treatment method for metal strips

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1483378B1 (en) * 1964-09-02 1969-10-23 Stein & Roubaix Societe Anonym Method for guiding metal bands in continuous ovens or the like.

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