US 12,075,549 B2
Heating coil, heating apparatus and manufacturing method of workpiece
Maho Hosogi, Tokyo (JP); Yoshimasa Tanaka, Tokyo (JP); Syoichiro Iwasaki, Tokyo (JP); Hideyuki Kozaki, Tokyo (JP); and Yuuji Kodama, Tokyo (JP)
Assigned to NETUREN CO., LTD., Tokyo (JP)
Appl. No. 17/058,398
Filed by NETUREN CO., LTD., Tokyo (JP)
PCT Filed May 21, 2019, PCT No. PCT/JP2019/020089
§ 371(c)(1), (2) Date Nov. 24, 2020,
PCT Pub. No. WO2019/225596, PCT Pub. Date Nov. 28, 2019.
Claims priority of application No. 2018-100577 (JP), filed on May 25, 2018.
Prior Publication US 2021/0204370 A1, Jul. 1, 2021
Int. Cl. H05B 6/36 (2006.01); H05B 6/10 (2006.01)
CPC H05B 6/36 (2013.01) [H05B 6/102 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A heating coil configured to induction heat an outer peripheral surface of a workpiece which has a cylindrical peripheral surface and which is formed with a hole extending from the cylindrical peripheral surface in a radial direction of the workpiece, the heating coil comprising:
a first heating unit including at least one conductor which is configured to extend along the outer peripheral surface of the workpiece when the workpiece is placed in the heating coil; and
a second heating unit including at least one conductor which is configured to extend along the outer peripheral surface of the workpiece when the workpiece is placed in the heating coil,
wherein the conductor of the first heating unit and the conductor of the second heating unit are configured to be symmetrically arranged and mirror images of each other in plain view with respect to a symmetry plane in which a central axis of the outer peripheral surface of the workpiece is contained when the workpiece is placed in the heating coil,
wherein the conductor of the first heating unit extends in an inclination direction intersecting an axial direction and a circumferential direction of the outer peripheral surface of the workpiece when the workpiece is placed in the heating coil,
wherein the conductor of the second heating unit extends in an inclination direction intersecting the axial direction and the circumferential direction of the outer peripheral surface of the workpiece when the workpiece is placed in the heating coil,
wherein a width of the conductor of the first heating unit is greater than a diameter of the hole in the workpiece, and
wherein a width of the conductor of the second heating unit is greater than the diameter of the hole in the workpiece.