WO2007093213A1 - Verfahren zum induktiven erwärmen eines werkstücks - Google Patents
Verfahren zum induktiven erwärmen eines werkstücks Download PDFInfo
- Publication number
- WO2007093213A1 WO2007093213A1 PCT/EP2006/012402 EP2006012402W WO2007093213A1 WO 2007093213 A1 WO2007093213 A1 WO 2007093213A1 EP 2006012402 W EP2006012402 W EP 2006012402W WO 2007093213 A1 WO2007093213 A1 WO 2007093213A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- axis
- magnetic field
- workpiece
- rotation
- coil
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000010438 heat treatment Methods 0.000 title claims abstract description 16
- 230000001939 inductive effect Effects 0.000 title claims abstract description 7
- 230000005291 magnetic effect Effects 0.000 claims abstract description 67
- 230000004907 flux Effects 0.000 claims abstract description 26
- 238000004804 winding Methods 0.000 claims description 4
- 230000005294 ferromagnetic effect Effects 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
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
-
- 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
- H05B6/102—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces the metal pieces being rotated while induction heated
Definitions
- the invention relates to a method for inductively heating an electrically conductive workpiece by rotating the workpiece in the magnetic field of a superconducting windings comprising DC-conducting coil arrangement about an axis of rotation which forms an angle with the main axis of the magnetic field.
- the flux density of the magnetic field passing through the workpiece is set differently along the axis of rotation.
- the workpiece may in particular be a block or billet, for example of aluminum, copper or corresponding alloys. Usual diameters are between 50 mm and 400 mm, usual lengths between 20mm and 1,000 mm.
- the axis of rotation of the workpiece makes an angle with the major axis of the magnetic field of 90 °. According to the known law of induction, the temperature increase per unit of time is greater, the higher the flux density of the magnetic field and the higher the speed of the workpiece.
- an alternating field generating coil arrangement block is for this purpose by uniform heating to a basic temperature is additionally cost-intensive by switching on partial coils in the desired regions, which is cost-intensive, inter alia because of the ohmic losses in the coil arrangement and the control engineering effort.
- a method for inductive heating of an electrical workpiece in the interior of an AC-powered induction coil is known, which in turn is surrounded by at least one electrical shorting ring.
- the diameter of the short-circuit ring By changing the diameter of the short-circuit ring, its reactive power consumption can be regulated in order to achieve a steady, localized change in the specific heating power of the induction coil.
- the invention has for its object to provide a technical realization of this method, so that the temperature of the usually cylindrical workpiece along its coincident with the axis of rotation center axis a desired course, ie a non-zero, however does not necessarily have constant temperature gradient.
- the flux density of the magnetic field passing through the workpiece is adjusted differently along the axis of rotation. This can be done either by targeted influencing of the local flux density and / or by suitable positioning of the rotating workpiece relative to the always inhomogeneous magnetic field.
- areas of lower flux density are referred to as (relatively) weaker magnetic fields, and conversely, areas of higher flux density are referred to as (relatively) stronger magnetic fields.
- the magnetic field generating coil arrangement is preferably high-temperature superconducting. It can in particular consist of one or more, in the latter case mechanically parallel to each other, an approximately oval space enclosing and a dipole magnetic field generating coils, so-called race-track coils exist.
- the workpiece rotates about an axis of rotation approximately coincident with the long axis of the oval.
- a specifically different flux density along the axis of rotation can be generated, for example, by means of a magnetic short circuit introduced into a partial region of the magnetic field.
- the magnetic short circuit may consist of a ferromagnetic body. Near this body, the magnetic field is weaker. The area of the workpiece lying in this magnetic field is accordingly heated to a lesser extent.
- the different flux density along the axis of rotation can also be generated by means of an additional coil.
- This auxiliary coil may e.g. be positioned parallel axis offset from the superconducting coil assembly.
- the auxiliary coil may e.g. be positioned laterally adjacent to the coil assembly in the amount of one or the other end of the oval space in order to reinforce the already stronger in this area anyway stronger magnetic field. The part of the rotating workpiece located in this area is then heated more strongly.
- Another possibility is to position the additional coil coaxially with the axis of rotation and concentrically surrounding the workpiece in a partial region of the magnetic field.
- the workpiece is then penetrated both by the magnetic field of the coil arrangement and by the orthogonal magnetic field of the auxiliary coil fed in this case.
- a location-dependent different flux density can also be generated by means of a ferromagnetic yoke surrounding the coil arrangement outside.
- the yoke also has the advantage of shielding the magnetic field of the coil assembly to the outside and the same Amperewindungsiere to increase the flux density in the space enclosed by the coil arrangement and thus by the workpiece.
- the yoke may be similar to a torus open on the inside.
- the yoke may also have a closed or open ring or C-section with at least one pole piece on each side of the axis of rotation.
- an open cross-section at right angles to the axis of rotation
- the axis of rotation of the workpiece lies between the surfaces of the hollow cylinder defining the slot-shaped opening and forming the pole shoes or designed as pole shoes.
- the coil arrangement can sit on the yoke at any desired location.
- the magnetic field can also be generated by means of a respective superconducting coil on each shoe as a coil arrangement.
- the flux density which differs along the axis of rotation can also be generated by a spacing of the pole faces of the pole shoes of the yoke which changes along the axis of rotation.
- a flux density of the magnetic field passing through the workpiece along the axis of rotation can in particular also be adjusted by changing the angle enclosed by the axis of rotation of the workpiece and the main axis of the magnetic field. This angle then deviates from 90 °.
- the point at which the axis of rotation is tilted against the main axis of the magnetic field can be selected as a function of the temperature distribution required over the length of the workpiece. If, for example, the axis of rotation is tilted about a point lying in the region of an end face of a cylindrical workpiece, then This area of the workpiece remains in the area of the strong magnetic field, while the opposite end area is in a weaker magnetic field and therefore less heated.
- the tilt angle may be between about 2 ° and about 20 °, corresponding to an angle between about 88 ° and 70 ° included by the axis of rotation and the major axis of the magnetic field.
- FIG. 6b the same coil arrangement as in Fig. 6a, but with tilted axis of rotation of the workpiece
- FIG. 7a a superconducting coil on a leg of a C-shaped yoke in an end view and a partially cut and rotated by 90 ° view
- 7b is an end view of a C-shaped yoke with an arrangement of two superconducting coils
- FIG. 8a shows a race-track coil similar to FIG. 1, but with the axis of rotation of the workpiece tilted, FIG.
- FIG. 9 shows a race-track coil as in FIG. 1, but with a workpiece displaced linearly along its axis of rotation in the coil interior, FIG.
- 10b shows the same workpiece with an axis of rotation tilted by 6 ° with respect to an axis orthogonal to the axis of a magnetic field
- Fig. 11 is a simplified, but perspective view of a cylindrical workpiece whose longitudinal and rotational axis is tilted relative to the plane of an immediate race-track coil.
- Fig. 1 shows a superconducting race-track coil S in a schematic simplification. It includes a number of turns, not shown, and is DC-flowed to produce a dipole magnetic field. This penetrates a cylindrical workpiece W made of an electrically conductive material.
- the workpiece may be, for example, an aluminum ingot or billet.
- the workpiece W is rotationally driven about its longitudinal axis D. The drive is not shown. In this way, the workpiece W, as known, is heated inductively.
- a magnetic short circuit K is located in the upper part of the oval space, here in the form of a short cylinder made of a ferromagnetic material. In the vicinity of this short circuit K, the magnetic field B passing through the workpiece W is weakened. The upper end region of the workpiece W therefore experiences less heating than those regions of the workpiece which are penetrated by the unattenuated magnetic field of the coil S.
- Fig. 2 shows the principle the same arrangement as Fig. 1, but is offset parallel axis offset from the coil S, an additional coil Z is arranged, whose turns are also flowed through DC.
- the additional coil Z With the same winding sense of the additional coil Z and the coil S, the magnetic fields in the sense of a reinforcement of the upper part of the workpiece W passing through total magnetic field overlap. This part of the workpiece W is therefore heated more than the rest of the part. If another area of the workpiece W is to be heated more strongly than the remaining areas, then the additional coil Z is displaced in the direction of the double arrow to the desired location.
- the desired temperature difference or temperature increase can be set by changing the excitation current of the additional coil Z.
- a closed yoke J can, as shown in FIG be arranged upper short leg of the coil S.
- the yoke J improves the magnetic short circuit and simultaneously shields the magnetic field of the coil S at this point to the outside. Accordingly, in this embodiment as well, the upper region of the workpiece W is heated less than the remaining region.
- FIG. A yoke Jl surrounds the entire Spulenan- order and thus largely shields the magnetic field to the outside.
- the excitation power needed to generate the magnetic field with the flow direction B decreases, more specifically the excitation current through the coil S.
- the differential heating of the workpiece W i. a temperature gradient along its axis, can also be achieved in this Anorndung with the explained with reference to Figures 1 to 3 measures.
- FIG. 6a The arrangement shown in FIG. 6a is based on a closed yoke J2 with pole shoes P1 and P2, each of which carries a superconducting coil S1 or S2, which are electrically connected in series and through which DC flows.
- the different strength of the magnetic field is indicated by the line width of the arrows symbolizing the field lines.
- FIG. 6b shows a similar arrangement to FIG. 6a, but in this case the workpiece W is not achieved by displacement along the axis of rotation D but by a tilting of this axis of rotation with respect to the long axis of the coil arrangement S1, S2, J. This is due to the semi-perspective shown in the end view of Fig. 6b.
- Fig. 7a shows an arrangement in which a superconducting coil S3 encloses the long leg of a C-shaped yoke J3, between which pole pieces P3 and P4 the workpiece rotates.
- the cut and rotated plan view illustrates that the pole shoes P3 and P4 delimit a space wedge-shaped from right to left around the workpiece W, so that the workpiece W progressively heats progressively from right to left in accordance with the decreasing air gap.
- This arrangement has the advantage of an over the length of the workpiece approximately constant temperature gradient.
- FIG. 7b operates, with the only difference that instead of a coil here two superconducting coils S4 and S5 are used, each of which surrounds a pole piece P5 and P6.
- Fig. 8a operates with a race-track coil S analogous to FIG. 1, but the different heating of the workpiece W along its axis of rotation D is achieved in that this axis of rotation relative to the median plane of the coil S by an angle ⁇ to a point lying on the central axis M is tilted.
- the flux density B decreases from the lower to the upper end of the workpiece W, so that the upper end of the workpiece is heated less than the remaining portion thereof.
- FIG. 8b operates, however, with two coaxially adjacent or behind one another, superconducting coils S6 and S7, whereby a higher flux density B is achieved.
- FIG. 9 also shows a race-track coil S which carries the work W encloses.
- the workpiece is shifted from its symmetrical position in the space enclosed by the coil S space along the axis of rotation D upwards.
- the upper part of the workpiece W is in a region of higher flux density B than the rest of the workpiece, so it is heated more.
- the workpiece can, if desired, additionally be tilted out of the median plane of the coil S by a point expediently located in the region of the upper end face (not shown).
- the following table illustrates on a numerical example the achievable temperatures and temperature differences.
- the workpiece consists of a billet with a length of 800mm and a diameter of 250mm.
- “compensation” denotes a waiting time after completion of the inductive heating and before determination of the temperatures at the points shown in FIG. 10a.
- the tilt angle o; in the first column is defined as in Figs. 8a and 10b.
- the linear displacement in the second column refers to the displacement along the axis of rotation D of the workpiece explained with reference to FIG. 9.
- the entries in the last five lines show that it may be advantageous to apply the two fundamentally separately applicable measures of displacement of the workpiece and the tilting of the axis of rotation combined.
- Figure 11 illustrates in perspective but schematically simplified a billet with tilted axis of rotation in a race-track coil.
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2006338053A AU2006338053B2 (en) | 2005-12-22 | 2006-12-21 | Method for inductive heating of a workpiece |
CA002634602A CA2634602A1 (en) | 2005-12-22 | 2006-12-21 | Method for inductive heating of a workpiece |
EP06849391A EP1847157A1 (de) | 2005-12-22 | 2006-12-21 | Verfahren zum induktiven erwärmen eines werkstücks |
JP2008546266A JP4571692B2 (ja) | 2005-12-22 | 2006-12-21 | 加工物の誘導加熱方法 |
US11/767,278 US20080017634A1 (en) | 2005-12-22 | 2007-06-22 | Method for Inductive Heating of a Workpiece |
US13/272,176 US20120080424A1 (en) | 2005-12-22 | 2011-10-12 | Method for Inductive Heating of a Workpiece |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005061670A DE102005061670B4 (de) | 2005-12-22 | 2005-12-22 | Verfahren zum induktiven Erwärmen eines Werkstücks |
DE102005061670.4 | 2005-12-22 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/767,278 Continuation US20080017634A1 (en) | 2005-12-22 | 2007-06-22 | Method for Inductive Heating of a Workpiece |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2007093213A1 true WO2007093213A1 (de) | 2007-08-23 |
Family
ID=37876872
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2006/012402 WO2007093213A1 (de) | 2005-12-22 | 2006-12-21 | Verfahren zum induktiven erwärmen eines werkstücks |
Country Status (9)
Country | Link |
---|---|
US (1) | US20080017634A1 (de) |
EP (1) | EP1847157A1 (de) |
JP (1) | JP4571692B2 (de) |
KR (1) | KR100957683B1 (de) |
CN (1) | CN101347045A (de) |
AU (1) | AU2006338053B2 (de) |
CA (1) | CA2634602A1 (de) |
DE (1) | DE102005061670B4 (de) |
WO (1) | WO2007093213A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100147834A1 (en) * | 2007-10-24 | 2010-06-17 | Zenergy Power Gmbh | Method for Induction Heating of a Metallic Workpiece |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007051144B4 (de) | 2007-07-26 | 2010-06-02 | Zenergy Power Gmbh | Induktionsheizer und Verfahren zum Verstellen der Breite der Schächte eines derartigen Induktionsheizers |
DE102007034970B4 (de) * | 2007-07-26 | 2010-05-12 | Zenergy Power Gmbh | Verfahren und Vorrichtung zum induktiven Erwärmen zumindest eines Billets |
KR101387492B1 (ko) * | 2007-11-26 | 2014-04-22 | 삼성전자주식회사 | 가열 유닛, 그리고 리플로우 장치 및 방법 |
FI20095213A0 (fi) | 2009-03-04 | 2009-03-04 | Prizztech Oy | Induktiokuumennusmenetelmä ja -laitteisto |
DE102010053284A1 (de) * | 2010-12-02 | 2012-06-06 | Zenergy Power Gmbh | Verfahren und Induktionsheizer zum Erwärmen eines Billets |
DE102010053283A1 (de) * | 2010-12-02 | 2012-06-06 | Zenergy Power Gmbh | Verfahren und Induktionsheizer zum Erwärmen von Billets |
JP6100234B2 (ja) | 2011-03-28 | 2017-03-22 | バイオサーフィット、 ソシエダッド アノニマ | 液体のスイッチング、ドーシングおよびポンピング |
CN103313449B (zh) * | 2013-05-14 | 2015-09-09 | 上海超导科技股份有限公司 | 感应加热装置及其感应加热方法 |
CN103391654A (zh) * | 2013-06-28 | 2013-11-13 | 苏州科睿特能源科技有限公司 | 一种可实现固体金属材料梯度加热的装置 |
KR20160088335A (ko) * | 2013-11-22 | 2016-07-25 | 프레셔라이트(피티와이) 리미티드 | 차량 타이어의 압력 제어 장치 |
WO2017212031A1 (en) | 2016-06-09 | 2017-12-14 | Biosurfit, S.A. | Liquid handling device for rotationally driving liquid flow and method of using device |
KR101877118B1 (ko) * | 2016-06-14 | 2018-07-10 | 창원대학교 산학협력단 | 자기장 변위를 이용한 초전도 직류 유도가열 장치 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004066681A1 (en) * | 2003-01-24 | 2004-08-05 | Sintef Energiforskning As | An apparatus and a method for induction heating of pieces of electrically conducting and non-magnetic material |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1036886B (de) * | 1955-03-18 | 1958-08-21 | Deutsche Edelstahlwerke Ag | Vorrichtung zum induktiven Haerten langgestreckter Werkstuecke |
US2902572A (en) * | 1957-03-05 | 1959-09-01 | Penn Induction Company | Induction heating of metal strip |
DE1215276B (de) * | 1965-10-06 | 1966-04-28 | Deutsche Edelstahlwerke Ag | Vorrichtung zur stetigen, oertlich begrenzten Veraenderung der spezifischen Heizleistung eines Induktors |
CH568661A5 (de) * | 1973-09-24 | 1975-10-31 | Varta Batterie | |
US4761527A (en) * | 1985-10-04 | 1988-08-02 | Mohr Glenn R | Magnetic flux induction heating |
US4856097A (en) * | 1988-03-29 | 1989-08-08 | Glenn Mohr | Apparatus for induction heating of electrically conductive metal wire and strip |
US5032748A (en) * | 1988-11-11 | 1991-07-16 | Sumitomo Heavy Industries, Ltd. | Superconducting DC machine |
US5251685A (en) * | 1992-08-05 | 1993-10-12 | Inland Steel Company | Apparatus and method for sidewall containment of molten metal with horizontal alternating magnetic fields |
JPH08212512A (ja) * | 1995-02-03 | 1996-08-20 | Hitachi Ltd | 磁気記憶装置及びそれに用いる薄膜磁気ヘッドとその製造方法 |
US6208497B1 (en) * | 1997-06-26 | 2001-03-27 | Venture Scientifics, Llc | System and method for servo control of nonlinear electromagnetic actuators |
US6942469B2 (en) * | 1997-06-26 | 2005-09-13 | Crystal Investments, Inc. | Solenoid cassette pump with servo controlled volume detection |
JP3582049B2 (ja) * | 1997-07-25 | 2004-10-27 | スチールプランテック株式会社 | 誘導加熱装置 |
US6602620B1 (en) * | 1998-12-28 | 2003-08-05 | Kabushiki Kaisha Toshiba | Magnetic recording apparatus, magnetic recording medium and manufacturing method thereof |
DE20023192U1 (de) * | 2000-07-26 | 2003-12-24 | Schmidt, Arno | Induktionstiegelrinnenofen |
DE20203784U1 (de) * | 2002-03-08 | 2003-07-24 | Franz Haimer Maschb Kg | Vorrichtung zum induktiven Erwärmen eines Werkzeughalters |
DE102004021818A1 (de) * | 2004-04-30 | 2005-12-08 | Alpha Ip Verwertungsgesellschaft Mbh | Energieeffiziente Erwärmungsanlage für Metalle |
-
2005
- 2005-12-22 DE DE102005061670A patent/DE102005061670B4/de not_active Expired - Fee Related
-
2006
- 2006-12-21 KR KR1020087017774A patent/KR100957683B1/ko not_active IP Right Cessation
- 2006-12-21 CA CA002634602A patent/CA2634602A1/en not_active Abandoned
- 2006-12-21 JP JP2008546266A patent/JP4571692B2/ja not_active Expired - Fee Related
- 2006-12-21 EP EP06849391A patent/EP1847157A1/de not_active Withdrawn
- 2006-12-21 CN CNA2006800487849A patent/CN101347045A/zh active Pending
- 2006-12-21 AU AU2006338053A patent/AU2006338053B2/en not_active Ceased
- 2006-12-21 WO PCT/EP2006/012402 patent/WO2007093213A1/de active Application Filing
-
2007
- 2007-06-22 US US11/767,278 patent/US20080017634A1/en not_active Abandoned
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004066681A1 (en) * | 2003-01-24 | 2004-08-05 | Sintef Energiforskning As | An apparatus and a method for induction heating of pieces of electrically conducting and non-magnetic material |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100147834A1 (en) * | 2007-10-24 | 2010-06-17 | Zenergy Power Gmbh | Method for Induction Heating of a Metallic Workpiece |
Also Published As
Publication number | Publication date |
---|---|
CA2634602A1 (en) | 2007-08-23 |
AU2006338053B2 (en) | 2010-04-15 |
CN101347045A (zh) | 2009-01-14 |
EP1847157A1 (de) | 2007-10-24 |
AU2006338053A1 (en) | 2007-08-23 |
KR100957683B1 (ko) | 2010-05-12 |
DE102005061670B4 (de) | 2008-08-07 |
US20080017634A1 (en) | 2008-01-24 |
JP2009521078A (ja) | 2009-05-28 |
KR20080090433A (ko) | 2008-10-08 |
DE102005061670A1 (de) | 2007-07-05 |
JP4571692B2 (ja) | 2010-10-27 |
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