Kawasaki, Japan
Kawasaki, Japan

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According to an embodiment, an induction heating coil includes a heating conductor portion which is formed of a conductor member and has a zigzag shape in which a bent portion opened to one side in a first direction and a bent portion opened to the other side in the first direction are alternately continuously arranged in opposite directions along a second direction crossing the first direction


An induction heating device and an induction heating method are provided. The entire areas to be heated of the workpiece, even a large workpiece, can be readily and approximately uniformly heated to a predetermined high temperature, and uniform heating is possible even when the workpiece deforms in a non-uniform manner during heating. When areas to be heated H1, H2 are established on a workpiece W so as to extend in one direction and the areas to be heated H1, H2 are induction-heated, the deformation amount on one edge of the areas to be heated H1, H2 is different from that on the other. This induction heating device includes: heating coils 451 facing a portion of the areas to be heated H1, H2 when the workpiece W is induction-heated; and a relative transfer means for transferring the workpiece W and the heating coils 451 along one direction in a relative manner, and the heating coils 451 are disposed so as to correspond to the areas to be heated H1, H2 during the heating period.


Patent
Neturen Co. | Date: 2017-03-29

Object of the present invention is to provide a welding method prevented the fracture at the spot weld zone by recovering the strength of a spot weld zone, namely, the ductility and the toughness in the spot weld zone, and a weld structure manufactured by the method. In the welding method, the steel sheets are heat treated and spot welded and a spot weld zone composed of a weld nugget and a heat affected zone is formed at the outer periphery of the weld nugget, spot welded steel sheets are tempering treated by applying a high-frequency electrical current on the spot weld zone and a heat accumulation zone elevated a temperature is formed at the outer periphery of the weld nugget and a hardness at the weld nugget is made 150% or less of the hardness of the heat treated steel sheets and a hardness at the heat affected zone is made 30% to 90% of the hardness at the weld nugget before the tempering treatment; and the diameter of the weld nugget NR (mm) satisfies the conditional expression (1).


Patent
Neturen Co. | Date: 2017-02-08

A workpiece for an induction hardening is provided. The workpiece has a first inclined surface, a second inclined surface, and a connecting surface connecting the first inclined surface and the second inclined surface on a side toward which the first inclined surface and the second inclined surface approach each other. The connecting surface has a recessed portion. A hardened layer formed at the first inclined surface and another hardened layer formed at the second inclined surface do not overlap each other at the recessed portion.


A heating apparatus, a heating method, and a heating coil are provided by which a corner portion and a bottom portion of a recessed surface extending in a longitudinal direction of a workpiece can be heated in an equal manner. Heating coils are opposed to a portion of an annular worpiece having a continuously provided recessed surface, and the heating coils and the annular worpiece are moved relative to each other to heat the recessed surface by induction heating. The heating apparatus includes a first heating coil having a first corner conductor portion to be opposed to a first corner portion of the recessed surface and a first bottom conductor portion connected to the first corner conductor portion to be opposed to the bottom portion, and a second heating coil having a second corner conductor portion to be opposed to a second corner portion of the recessed surface and a second bottom conductor portion connected to the second corner conductor portion to be opposed to the bottom portion.


Patent
Neturen Co. | Date: 2016-05-04

Provided are: a welded structural member whose spot-welded part has both strength and ductility, and whose rupture strength proven by a rupture test such as a cross tensile test is high; and a method for welding such a structural member. The welded part 3 of the welded structural member 1 made of the above steel plates bonded by overlapping their faces and forming the welded part 3 by spot welding includes: a molten and solidified part 4; and a heat-affected zone 5 surrounding the molten and solidified part 4. The hardness on the welded surface increases to harder than the hardness of the steel plates 2 (base material) along a direction from a region outside the heat-affected zone 5 toward the heat-affected zone 5.


Patent
Neturen Co. | Date: 2016-03-11

A rack bar includes a shaft portion and a rack toothed portion provided on the shaft portion. The rack toothed portion includes a plurality of rack teeth provided side by side in an axial direction of the shaft portion to mesh with a pinion gear. Each of the rack teeth includes a tooth tip portion, a contact face arranged obliquely relative to the axial direction and configured to contact the pinion gear, and a rounded corner portion between the tooth tip portion and the contact face. A first radius defining a central area of the rounded corner portion with respect to a tooth width direction is larger than a second radius defining another area of the rounded corner portion other than the central area.


Patent
Neturen Co. and Neturen Takuto Co. | Date: 2016-01-21

A heating apparatus, a heat treatment apparatus, and a heating method are provided. The heating apparatus includes a workpiece support on which a ring-shaped workpiece is placed, a rotary drive assembly, and a heater configured to heat the workpiece. The workpiece support includes a plurality of rotating rollers arranged in a circumferential direction. The rotary drive assembly is configured to rotate the plurality of rotating rollers to rotate the workpiece placed on the workpiece support along a ring shape of the workpiece. The heater includes a heating coil configured to induction-heat the workpiece on the workpiece support at a heating position, and an actuator configured to move the heating coil at the heating position relative to the workpiece to adjust a distance between the workpiece and the heating coil.


Patent
Neturen Co. and Neturen Takuto Co. | Date: 2016-01-21

A heating apparatus, a heat treatment apparatus, and a heating method are provided. The heating apparatus includes a workpiece support on which a ring-shaped workpiece is placed, a rotary drive assembly, and a heater configured to heat the workpiece. The workpiece support includes a plurality of rotating rollers arranged in a circumferential direction. The rotary drive assembly is configured to rotate the plurality of rotating rollers to rotate the workpiece placed on the workpiece support along a ring shape of the workpiece. The heater includes a heating coil configured to induction-heat the workpiece on the workpiece support at a heating position, and an actuator configured to move the heating coil at the heating position relative to the workpiece to adjust a distance between the workpiece and the heating coil.


An induction heating coil (3) has a primary coil (4) to which electric power is supplied and a ring-shaped secondary coil (5) forming a closed circuit. The primary coil (4) has a base-side portion that covers an outer periphery of the secondary coil (5) and a distal-side portion extending from the base-side portion in the center axis direction of the secondary coil (5) in a state in which the base-side portion covers the secondary coil (5). The opening width of the base-side portion is greater than the opening width of the distal-side portion. The secondary coil (5) is provided such that it can be inserted into and removed from the inside of the primary coil (4) from the base-side portion of the primary coil (4).

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