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US 8,540,827 B2Granted
Undercut crankshaft hardening coil
AssigneeAjax Tocco Magnethermic Corporation
InventorsTom Illencik, Ronald R. Akers, Richard Mckelvey
Life of this patent
Estimating the term…
Abstract
Improved induction heating methods are presented for induction hardening undercut fillets of crankshafts or other workpiece recesses or undercuts in which an active turn is energized to induce current in a passive turn translated toward a workpiece undercut for heating the undercut.
Claims13
A method of hardening a workpiece using induction heating, the method comprising:
- translating a coil assembly toward the workpiece;
- translating a passive turn of the coil assembly relative to an active turn of the coil assembly such that a passive coupling section of the passive turn is electromagnetically coupled with an active coupling section of the active turn wherein translating the passive turn relative to the active turn comprises translating at least a portion of a passive heating section of the passive turn within an undercut area of a recess in the workpiece;
- and
- energizing the active turn with electrical power to induce electrical current in the passive turn to heat at least a portion of the workpiece using the passive heating section of the passive turn.
1 more element
A method of hardening a workpiece using induction heating, the method comprising:
- translating a coil assembly toward the workpiece;
- translating a passive turn of the coil assembly relative to an active turn of the coil assembly toward an undercut area of a recess in the workpiece wherein translating the passive turn relative to the active turn comprises translating the passive turn in a direction generally parallel to a longitudinal axis of the workpiece;
- and
- energizing the active turn with electrical power to induce electrical current in the passive turn to heat at least a portion of the workpiece using a passive heating section of the passive turn.
1 more element
A method of hardening a workpiece using induction heating, the method comprising:
- providing a coil assembly including an active turn and a passive turn electrically isolated from one another and translatable relative to one another;
- translating the coil assembly toward the workpiece while the passive turn is in a first position relative to the active turn such that at least a portion of the passive turn of the coil assembly clears a portion of the workpiece;
- translating the passive turn relative to the active turn toward at least one undercut area of the workpiece wherein the undercut area is a region that is recessed from at least one sidewall of the workpiece, the sidewall is generally parallel relative to a longitudinal axis of the workpiece;
- energizing the active turn with electrical power to induce electrical current in the passive turn to heat at least a portion of the workpiece.
1 more element
Dependencies are inferred from the claim text.