US Pat. No. 9,491,810

INDUCTOR FOR SINGLE-SHOT INDUCTION HEATING OF COMPLEX WORKPIECES

INDUCTOHEAT, INC., Madis...

1. A single-shot inductor for an induction heat treatment of a complex workpiece comprising an at least partially cylindrical
component with its central axis coincident with the central axis of a circular component, the at least partially cylindrical
component connected at one end to the circular component and the circular component having a circular component diameter larger
than a cylindrical component diameter of the at least partially cylindrical component, the single-shot inductor comprising:
a crossover inductor section, the crossover inductor section comprising a supply crossover section and a return crossover
section, the supply crossover section having a power source supply end and a supply leg crossover section end, the supply
leg crossover section end opposing the power source supply end, the return crossover section having a power source return
end and a return leg crossover section end, the return leg crossover section end opposing the power source return end, the
supply crossover section and the return crossover section electrically isolated from each other between the power source supply
end and the power source return end, the power source supply end and the power source return end located adjacent to each
other and separated by a dielectric;

a collar inductor section, the collar inductor section comprising a first collar section and a second collar section, the
first collar section having a first collar section supply leg end and a first collar section return leg end, the first collar
section return leg end opposing the first collar section supply leg end, the second collar section having a second collar
section supply leg end and a second collar section return leg end, the second collar section return leg end opposing the second
collar section supply leg end;

a supply longitudinal leg inductor section having a supply leg crossover end and a supply leg collar end, the supply leg collar
end opposing the supply leg crossover end, the supply leg crossover end connected to the supply leg crossover section end,
and the supply leg collar end connected between the first collar section supply leg end and the second collar section supply
leg end; and

a return longitudinal leg inductor section having a return leg crossover end and a return leg collar end, the return leg collar
end opposing the return leg crossover end, the return leg crossover end connected to the return leg crossover section end,
and the return leg collar end connected between the first collar section return leg end and the second collar section return
leg end to form a continuous electrical conductor from the first collar section and the second collar section around the supply
leg collar end of the supply longitudinal leg inductor section and the return leg collar end of the return longitudinal leg
inductor section whereby when the at least partially cylindrical component of the complex workpiece is situated between the
supply longitudinal leg inductor section and the return longitudinal leg inductor section and the circular component is situated
adjacent to the exterior face of the collar inductor section, and an alternating current power source is connected between
the power source supply end of the supply crossover section and the power source return end of the return crossover section,
the complex workpiece is inductively heat treated.

US Pat. No. 9,121,081

MULTI-FREQUENCY HEAT TREATMENT OF A WORKPIECE BY INDUCTION HEATING

INDUCTOHEAT, INC., Madis...

1. An apparatus for induction heat treatment of a workpiece, the apparatus comprising:
an induction coil at least partially surrounding the workpiece;
a generally C-core inductor comprising a first core segment and a second core segment, the workpiece disposed in a gap between
the first core segment and the second core segment to form a magnetic circuit with the generally C-core inductor;

a solenoidal coil wound around a section of the first core segment;
a first power supply providing a first ac current to the induction coil to induce a first ac magnetic field around the induction
coil, the first ac magnetic field coupling with the workpiece to inductively heat the workpiece; and

a second power supply providing a second ac current to the solenoidal coil to induce a second ac magnetic field in the magnetic
circuit to heat the workpiece by the Joule effect, the frequency of the second ac current lower than the frequency of the
first ac current.

US Pat. No. 9,084,297

INDUCTION HEAT TREATMENT OF AN ANNULAR WORKPIECE

INDUCTOHEAT, INC., Madis...

1. A method of electric induction heat treatment of at least one circular surface of an annular workpiece, the method comprising
the steps of:
positioning side-by-side a first and a second inductor at an initial position adjacent to the at least one circular surface,
the initial position located within an oscillatory arc zone of the at least one circular surface, the oscillatory arc zone
having a first and a second arc boundary;

supplying an oscillatory zone alternating current to the first and second inductors while circumferentially moving side-by-side
the first and second inductors repeatedly between the first and second arc boundaries for a pre-heat period of time while
adjacent to the at least one circular surface;

supplying a steady state heat treatment power having a steady state power magnitude and frequency to the first and second
inductors while separating the first and the second inductors in the oscillatory arc zone by moving the first inductor in
a first circumferential direction adjacent to the at least one circular surface to a first inductor end steady state heat
treatment position less than 180 degrees opposite the initial position at a steady state scan rate, and by moving the second
inductor in a second circumferential direction adjacent to the at least one circular surface to a second inductor end steady
state heat treatment position at the steady state scan rate, the second circumferential direction opposite to the first circumferential
direction;

directing a first quenchant spray from a first quench apparatus to impinge on a first inductor heated region of the at least
one circular surface heated by the first inductor as the first inductor moves in the first circumferential direction to the
first inductor end steady state heat treatment position after the first inductor separates from the second inductor by a spray
interference distance, and directing a second quenchant spray from a second quench apparatus to impinge on a second inductor
heated region of the at least one circular surface heated by the second inductor as the second inductor moves in the second
circumferential direction to the second inductor end steady state heat treatment position after the second inductor separates
from the first inductor by the spray interference distance;

removing the steady state heat treatment power from the first inductor and terminating the first quenchant spray after the
first inductor completes heat treatment at the first inductor end steady state heat treatment position;

moving the second inductor in the second circumferential direction after the second inductor completes heat treatment at the
second inductor end steady state heat treatment position to the end of an extended end scan region to heat treat the extended
end scan region at an end of heat treatment scan rate faster than the steady state scan rate and at an end of heat treatment
power magnitude and frequency; and

directing the second quenchant spray to impinge on the extended end spray region by alternatively repositioning the second
quench apparatus while the second inductor is at the end of the extended end scan region or moving the second quench apparatus
through the extend end spray region.

US Pat. No. 9,060,390

ELECTRIC INDUCTION HEAT TREATMENT OF WORKPIECES HAVING CIRCULAR COMPONENTS

INDUCTOHEAT, INC., Madis...

1. A method of induction heat treatment for a circular workpiece, the method comprising the steps of:
placing the circular workpiece on a horizontal and lateral support structure disposed within an induction coil with a side
wall of the circular workpiece vertically oriented to transport the circular workpiece from a coil entry position to a coil
exit position; and

contacting the side wall of the circular workpiece with a workpiece pusher element that is not directed through the central
axis of the circular workpiece the workpiece pusher element connected to a drive apparatus for moving the workpiece pusher
element through the induction coil so that contacting the side wall of the circular workpiece with the workpiece pusher element
simultaneously rotates the circular workpiece in the horizontal and lateral support structure and advances the circular workpiece
through the induction coil.

US Pat. No. 10,034,331

CONTROLLED ELECTRIC INDUCTION HEATING OF AN ELECTRICALLY CONDUCTIVE WORKPIECE IN A SOLENOIDAL COIL WITH FLUX COMPENSATORS

INDUCTOHEAT, INC., Madis...

1. A method of controlling an induced longitudinally oriented, cross sectional heating profile in an electrically conductive elongated workpiece without flux concentrators, the method comprising the steps of:positioning the electrically conductive elongated workpiece in a solenoidal type induction coil so that a coil overhang region exists adjacent to at least one end of the electrically conductive elongated workpiece;
positioning at least one flux compensator in the coil overhang region with one end of the at least one flux compensator proximate to the at least one end of the electrically conductive elongated workpiece to alter the induced longitudinally oriented, cross sectional heating profile in the at least one end of the electrically conductive elongated workpiece; and
supplying an alternating current to the solenoidal type induction coil to localize in the electrically conductive elongated workpiece or the at least one flux compensator an electromagnetic end effect zone and create the induced longitudinally oriented, cross sectional heating profile in the electrically conductive elongated workpiece.

US Pat. No. 9,693,397

INDUCTION HEAT TREATMENT OF AN ANNULAR WORKPIECE

INDUCTOHEAT, INC., Madis...

1. An apparatus for an electric induction heat treatment of at least one continuous circular surface of a bearing race, the
apparatus comprising:
a bearing race support assembly for mounting the bearing race, the bearing race support assembly comprising:
a central support beam having a longitudinal length;
a first extended arm support beam and a second extended arm support beam, the first extended arm support beam having a first
extended arm first end and a first extended arm second end, and the second extended arm support beam having a second extended
arm first end and a second extended arm second end, the first and the second extended arm first ends extending at an acute
angle from the opposing sides of the central support beam along the longitudinal length of the central support beam;

a first joining arm support beam and a second joining arm support beam, the first joining arm support beam having a first
joining arm first end and a first joining arm second end, and the second joining arm support beam having a second joining
arm first end and a second joining arm second end, the first joining arm first end connected to the first extended arm second
end, the second joining arm first end connected to the second extend arm second end, the first and second joining arm second
ends connected together on opposing sides of the central support beam to form a “V” shaped frame on each side of the central
support beam; and

a first workpiece retention element, a second workpiece retention element and a third workpiece retention element each slidably
attached respectively to the central support beam, the first joining arm support beam, and the second joining arm support
beam, the first, second and third workpiece retention elements selectively engaging an outer circumferential surface of the
bearing race, an inner circumferential surface of the bearing race, or a fixture upon which the bearing race is seated to
provide a three-point workpiece retention system;

an inductor assembly support and movement apparatus comprising an at least one inductor pair, each of the at least one inductor
pair comprising a first inductor and a second inductor, the first and the second inductors of each of the at least one inductor
pair connected to a transport apparatus comprising:

a first positioning means for linearly moving each of the first and the second inductors independently in an Y-Z plane parallel
to the central axis of the bearing race mounted on the bearing race support system;

a second positioning means for linearly moving each of the first and the second inductors in an X-Y plane perpendicular to
the central axis of the bearing race in a first orthogonal direction and a second orthogonal direction of the X-Y plane, the
linear movement in the first orthogonal direction being a joint linear movement of the first and second inductors, and the
linear movement in the second orthogonal direction being an independent movement of each of the first and second inductors;
and

a third positioning means for independently rotating the first inductor around a Z1R longitudinal axis of the first inductor and the second inductor around a Z2R longitudinal axis of the second inductor, the Z1R longitudinal axis and the Z2R longitudinal axis each being parallel to the central axis of the bearing race;

and a control system comprising:
a first control means for coordinately controlling at least the first positioning means and the linear movement in the second
orthogonal direction of the second positioning means for positioning the first and second inductors side-by-side to an initial
position for heat treatment adjacent to the at least one continuous circular surface of the bearing race;

a second control means for coordinately controlling at least the second and third positioning means to move the first inductor
and the second inductor in an oscillatory arc zone for pre-heat;

a third control means for coordinately controlling at least the second and the third positioning means to move the first inductor
and the second inductor in opposite circular heat treatment paths adjacent to the at least one continuous circular surface
to a position less than 180 degrees opposite to the initial position of the first inductor and the second inductor where the
first and second inductors are side-by-side; and

a means for coordinately controlling at least the second and the third positioning means to selectively move the first and
second inductors through an end of heat treatment process steps.

US Pat. No. 9,885,094

SINGLE SHOT INDUCTOR FOR HEAT TREATMENT OF CLOSELY SPACED MULTIPLE ECCENTRIC CYLINDRICAL COMPONENTS ARRANGED ALONG THE LONGITUDINAL AXIS OF A WORKPIECE

Inductoheat, Inc., Madis...

1. A single shot inductor for an induction heat treatment of a workpiece comprising at least one group of closely spaced multiple
eccentric cylindrical components arranged along a longitudinal axis of the workpiece for a single shot induction heat treatment
of the at least one group of closely spaced multiple eccentric cylindrical components, the single shot inductor comprising
an alternating sequential series of planar arcuate coil sections and axial coil sections, the alternating sequential series
of planar arcuate coil sections and axial coil sections comprising a first planar arcuate coil section, a second planar arcuate
coil section and a third planar arcuate coil section axially offset from each other along the length of a common coil sections
longitudinal central axis by a first and a second axial coil sections, and forming a single turn coil around the length of
the common coil sections longitudinal central axis with the axial coil sections providing an axial offset distance between
the planar arcuate coil sections where the alternating sequential series of planar arcuate coil sections are configured to
sequentially induction heat treat selected combinations of the at least one group of closely spaced multiple eccentric cylindrical
components when the at least one group of closely spaced multiple eccentric cylindrical components is inserted in the single
shot inductor and axially rotated through 360 degrees.

US Pat. No. 10,251,222

DOUBLE-SIDED FLAT INDUCTOR ASSEMBLY

Inductoheat, Inc., Madis...

1. A double-side inductor extraction assembly comprising:a stationary primary magnetic device (32a) mounted to a mounting structure, the stationary primary magnetic device (32a) having a supply primary magnetic device (32a?) and a return primary magnetic device (32a?);
a secondary magnetic device (32b) having an inductor supply secondary magnetic device (32b?) and an inductor return secondary magnetic device (32b?), the secondary magnetic device (32b) being electrically isolated from the stationary primary magnetic device (32a) and slidably mounted relative to the stationary primary magnetic device (32a) between:
a heating position when the supply primary magnetic device (32a?) is aligned with the inductor supply secondary magnetic device (32b?), and the return primary magnetic device (32a?) is aligned with the inductor return secondary magnetic device (32b?) and an alternating current source is supplied to the supply primary magnetic device (32a?) and the return primary magnetic device (32a?) to transfer flux respectively to the inductor supply secondary magnetic device (32b?) and the inductor return secondary magnetic device (32b?); and
a non-interference position when the supply primary magnetic device (32a?) is not aligned with the inductor supply secondary magnetic device (32b?) and the return primary magnetic device (32a?) is not aligned with the inductor return secondary magnetic device (32b?) to isolate the inductor supply secondary magnetic device (32b?) and the inductor return secondary magnetic device (32b?) from the alternating current source by sliding the secondary magnetic device (32b) relative to the stationary primary magnetic device (32a) to the non-interference position;
an extraction assembly supply terminal (88a) connected to the inductor supply secondary magnetic device (32b?), the extraction assembly supply terminal (88a) configured for electrical connection to a first inductor terminal section;
an extraction assembly return terminal (88b) connected to the inductor return secondary magnetic device (32b?), the extraction assembly return terminal (88b) configured for electrical connection to a second inductor terminal section; and
an extraction actuator (33) connected to the secondary magnetic device (32b) for sliding the secondary magnetic device (32b) and the extraction assembly supply and return terminals (88a and 88b) between the heating position and the non-interference position.