An apparatus for magnetic induction hardening of a workpiece includes a magnetic tool having a body portion formed of a generally non-magnetic material. The body portion has a surface configured to be positioned in close proximity to the workpiece being hardened. The apparatus further includes a mag
An apparatus for magnetic induction hardening of a workpiece includes a magnetic tool having a body portion formed of a generally non-magnetic material. The body portion has a surface configured to be positioned in close proximity to the workpiece being hardened. The apparatus further includes a magnetic arrangement coupled to the body portion at or adjacent the surface of the body portion and configured to provide regions of alternating polarity. A workpiece holder is configured to support the workpiece in close proximity to the surface of the magnetic tool. A drive arrangement for rotating the magnetic tool relative to the workpiece holder about an axis of rotation is provided to induce heating of the workpiece to achieve a temperature in the austenitic range of the workpiece resulting in hardening of the workpiece through a microstructural transformation.
대표청구항▼
1. An apparatus for magnetic induction hardening of an annular workpiece, the apparatus comprising: a magnetic tool having a body portion formed of a generally non-magnetic material, the body portion having a surface configured to be positioned in close proximity to the annular workpiece being harde
1. An apparatus for magnetic induction hardening of an annular workpiece, the apparatus comprising: a magnetic tool having a body portion formed of a generally non-magnetic material, the body portion having a surface configured to be positioned in close proximity to the annular workpiece being hardened, the surface of the body portion being a radially outwardly-facing circumferential surface configured for induction hardening an inner surface of the annular workpiece; anda magnetic arrangement coupled to the body portion at or adjacent the surface of the body portion and configured to provide regions of alternating polarity;a workpiece holder configured to support the annular workpiece in close proximity to the surface of the magnetic tool such that the magnetic arrangement is received within a bore defined by the inner surface of the annular workpiece; anda drive arrangement for rotating the magnetic tool relative to the workpiece holder about an axis of rotation to induce heating of the annular workpiece to achieve a temperature in the austenitic range of the annular workpiece for hardening of the annular workpiece through a microstructural transformation. 2. The apparatus of claim 1, further comprising a quenching system operable to quench the heated workpiece while it is supported by the workpiece holder. 3. The apparatus of claim 2, wherein the magnetic tool and the workpiece holder are movable relative to one another in a direction parallel to the axis of rotation between a first position for heating the workpiece, and a second position for quenching the workpiece. 4. The apparatus of claim 2, wherein the quenching system includes a quench collar surrounding the workpiece for showering the workpiece with a quenching medium. 5. The apparatus of claim 2, wherein the quenching system includes a conduit coupled to the workpiece holder to be positioned at least partially within the workpiece. 6. The apparatus of claim 5, wherein the body portion of the magnetic tool includes a recess sized and configured to receive at least a portion of the conduit when the surface of the body portion is positioned in close proximity to the workpiece. 7. The apparatus of claim 2, wherein the quenching system is integrated with the magnetic tool. 8. The apparatus of claim 7, wherein the body portion of the magnetic tool defines a conduit through which quenching medium flows. 9. The apparatus of claim 1, wherein the magnetic arrangement includes a plurality of permanent magnets coupled to the body portion at or adjacent the surface and configured to provide the regions of alternating polarity. 10. The apparatus of claim 9, wherein the body portion includes a plurality of pockets formed therein and spaced from the surface such that a wall portion of the body portion is defined between the surface and each of the plurality of pockets, and wherein each of the plurality of magnets is positioned in a respective one of the plurality of pockets. 11. The apparatus of claim 10, wherein the wall portion is less than 0.05 inches thick. 12. The apparatus of claim 11, wherein the wall portion is about 0.02 inches thick. 13. The apparatus of claim 9, wherein the body portion includes a plurality of pockets formed therein, and wherein each of the plurality of magnets is positioned in a respective one of the plurality of pockets such that a surface of each of the plurality of magnets is exposed to at least partially define the surface of the body portion. 14. The apparatus of claim 1, wherein the magnetic arrangement is configured to accommodate thermal expansion of the workpiece during heating. 15. The apparatus of claim 14 wherein the magnetic arrangement defines a first magnetic diameter at a first axial location, and a second, different magnetic diameter at a second axial location. 16. The apparatus of claim 14, wherein the magnetic arrangement includes a plurality of permanent magnets coupled to the body portion at or adjacent the surface and configured to provide the regions of alternating polarity, and wherein the plurality of magnets are movable in the radial direction to vary a magnetic diameter defined by the magnets. 17. The apparatus of claim 1, wherein the magnetic tool includes a mounting portion coupled to the body portion, wherein the mounting portion includes a mounting shaft sized and configured to be received in a spindle, and wherein the drive arrangement includes a drive unit operable to rotate the spindle. 18. The apparatus of claim 17, wherein the mounting shaft and the magnetic arrangement has a concentricity of about 0.004 inches or smaller. 19. The apparatus of claim 1, wherein the body portion is made of a material having low permeability. 20. The apparatus of claim 19, wherein the body portion is made of one of aluminum and austenitic stainless steel. 21. The apparatus of claim 1, wherein the magnetic tool further includes at least one flux concentrator. 22. The apparatus of claim 1, wherein the magnetic arrangement includes a plurality of regions each having a north-south axis, the magnetic arrangement being arranged such that a north-south axis of each of the plurality of regions extends in at least one of a generally radial direction and a generally axial direction. 23. The apparatus of claim 1, wherein the magnetic arrangement includes a plurality of regions each having a north-south axis, the magnetic arrangement being arranged such that a north-south axis of each of the plurality of regions extends in a generally circumferential direction. 24. The apparatus of claim 1, wherein the workpiece holder supports the workpiece with a clamping force sufficient to prevent rotation of the workpiece about the axis of rotation and to prevent the workpiece from translating along the axis of rotation. 25. The apparatus of claim 24, wherein the workpiece holder includes a plurality of pads operable to secure the workpiece to prevent rotation of the workpiece about the axis of rotation. 26. The apparatus of claim 25, wherein each of the pads includes a projection on which the workpiece rests. 27. The apparatus of claim 25, wherein engagement between each pad and the workpiece occurs at locations on the pad that are electrically non-conductive. 28. The apparatus of claim 27, wherein the locations are coated with a non-conductive material. 29. The apparatus of claim 27, wherein the locations are defined by non-conductive inserts coupled to the pad. 30. The apparatus of claim 25, wherein each of the pads is biased in a securing direction and thermal expansion of the workpiece is accommodated by the pads being permitted to move in opposition to the bias. 31. The apparatus of claim 24, wherein the workpiece holder includes a clamp operable to secure the workpiece to prevent translation of the workpiece along the axis of rotation. 32. The apparatus of claim 31, wherein engagement between the clamp and the workpiece occurs at a location on the clamp that is electrically non-conductive. 33. The apparatus of claim 32, wherein the location is coated with a non-conductive material. 34. The apparatus of claim 32, wherein the clamp is made of a non-conductive material. 35. The apparatus of claim 1, wherein the workpiece holder electrically isolates the workpiece from ground. 36. The apparatus of claim 1, wherein the workpiece holder supports the workpiece in a manner that accommodates thermal expansion of the workpiece. 37. The apparatus of claim 1, wherein the workpiece holder supports the workpiece at a distance spaced from the surface of the magnetic tool, the distance being less than about 0.07 inches. 38. The apparatus of claim 37, wherein the distance is about 0.02 inches to about 0.06 inches. 39. The apparatus of claim 1, wherein the magnetic arrangement defines a sufficient number of magnetic poles (nP) and the drive arrangement rotates the magnetic tool relative to the workpiece holder at a sufficient speed (RPM) to achieve a frequency of at least 5 kHz according to the equation Hz=(nP*RPM)/60. 40. The apparatus of claim 39, wherein the frequency is between 5 kHz and 21 kHz. 41. The apparatus of claim 1, wherein the magnetic arrangement defines a surface profile of a desired shape corresponding to a desired case hardening profile for the workpiece. 42. The apparatus of claim 1, wherein the magnetic arrangement defines a surface profile of a desired shape corresponding to a surface profile of the workpiece. 43. The apparatus of claim 1, wherein the magnetic arrangement includes a member that is magnetized to include a plurality of magnetic regions, the magnetic regions defining the regions of alternating polarity. 44. The apparatus of claim 43, wherein the magnetized member is a ring connected to the body portion, the ring defining the surface. 45. The apparatus of claim 1, further comprising an eddy current conduit positioned adjacent the surface and configured to conduct eddy current from the magnetic tool to a surface of the workpiece. 46. The apparatus of claim 45, wherein the eddy current conduit includes a lamination of silicon steel. 47. An apparatus for magnetic induction hardening of an annular workpiece, the apparatus comprising: a magnetic tool having a body portion formed of a generally non-magnetic material, the body portion having a surface configured to be positioned in close proximity to the annular workpiece being hardened, the surface of the body portion being a radially outwardly-facing circumferential surface configured for induction hardening an inner surface of the annular workpiece; anda magnetic arrangement including a plurality of permanent magnets coupled to the body portion at or adjacent the surface and configured to provide regions of alternating polarity;a workpiece holder configured to support the annular workpiece at a distance spaced from the surface of the magnetic tool such that the magnetic arrangement is received within a bore defined by the inner surface of the annular workpiece, the distance being less than about 0.07 inches; anda drive arrangement for rotating the magnetic tool relative to the workpiece holder about an axis of rotation to induce heating of the annular workpiece to achieve a temperature in the austenitic range of the annular workpiece for hardening of the annular workpiece through a microstructural transformation;wherein the magnetic arrangement defines a sufficient number of magnetic poles (nP) and the drive arrangement rotates the magnetic tool relative to the workpiece holder at a sufficient speed (RPM) to achieve a frequency of at least 5 kHz according to the equation Hz=(nP*RPM)/60. 48. The apparatus of claim 47, wherein the distance is about 0.02 inches to about 0.06 inches. 49. The apparatus of claim 47, wherein the frequency is between 5 kHz and 21 kHz. 50. The apparatus of claim 47, wherein the body portion includes a plurality of pockets formed therein and spaced from the surface such that a wall portion of the body portion is defined between the surface and each of the plurality of pockets, and wherein each of the plurality of magnets is positioned in a respective one of the plurality of pockets. 51. The apparatus of claim 50, wherein the wall portion is less than 0.05 inches thick. 52. The apparatus of claim 51, wherein the wall portion is about 0.02 inches thick. 53. The apparatus of claim 47, wherein the magnetic tool includes a mounting portion coupled to the body portion, wherein the mounting portion includes a mounting shaft sized and configured to be received in a spindle, wherein the drive arrangement includes a drive unit operable to rotate the spindle, and wherein the mounting shaft and the plurality of magnets has a concentricity of about 0.004 inches or smaller. 54. The apparatus of claim 47, wherein each of the permanent magnets is capable of delivering a flux density of greater than 1 Tesla.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (31)
Magnusson,Niklas, Apparatus and a method for induction heating of pieces of electrically conducting and non-magnetic material.
Maurice Jean (Paris FRX) Travers Roger (Chatenay-Malabry FRX) Camus Jean-Paul (Mantes la Jolie FRX), Apparatus for the magnetic induction heating of flat, rectangular metal products traveling in their longitudinal directi.
Burger Dieter (Vaihingen DEX) Burbck Walter (Stuttgart DEX) Linden Peter (Wernau DEX), Device for the inductive heating of the inside of cylinder liners of reciprocating-piston engines for the purpose of har.
Parker Barry John ; Krinickas Alexander ; Stilwell John Douglas ; Brown Neil Leonard, Electromagnetic heating devices, particularly for ram air turbines.
Anderson, Walter James; Browning, Philip Anthony; Higgins, Barrie; Spencer, Paul John; Powell, Brian Kenneth, Induction heating device for metal pieces.
Mucha George M. (Parma Heights OH) Pfaffmann George D. (Farmington MI) Novorsky Donald E. (Pleasant Ridge MI), Method and apparatus for hardening gears.
Pfaffmann George D. (Farmington MI) Balzer Norbert R. (Troy MI) Mucha George M. (Parma Hts. MI) Novorsky Donald E. (Pleasant Ridge MI), Method and apparatus for induction heating of gear teeth.
Mucha George M. (Parma Hts. OH) Novorsky Donald E. (Pleasant Ridge MI) Pfaffmann George D. (Farmington MI), Method for hardening gears by induction heating.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.