Neturen Co., Ltd.

Takashi Horino

Hiroki Inoue

Fumiaki Ikuta

Hidehiro Yasutake

Hiroshi Yoshida

Yoshimasa Tanaka

Yutaka Kiyosawa

Akira Terajima

Takeshi Endoh

Masayuki Komatsu

Jun Fujie

Takeshi Yoshikawa

A cooling jacket includes a coolant supply member that circulates a coolant, and a coolant injection member to which the coolant is supplied from the coolant supply member, the coolant injection member provided with multiple injection holes through which the coolant is injected. The coolant injection surface of the coolant injection member opposing the workpiece has an upper region, a central region, and a lower region arranged along a vertical direction. An area of each injection hole provided in the central region is larger than an area of each injection hole provided in the upper region and an area of each injection hole provided in the lower region. The coolant injection member moves relative to a workpiece in a horizontal direction. A densest direction in which the multiple injection holes are arranged at the shortest intervals is inclined with respect to both the horizontal direction and the vertical direction.

Cooling jacket and quenching apparatus

A heating coil includes a plurality of loop portions disposed coaxially along an axis, a first lead portion and a second lead portion which electrically connect to a power source, and a connection portion which connects the plurality of loop portions, the first lead portion, and the second lead portion in series.

Heating coil and heating method

Rectifier

A direct resistance heating simulation method is provided. In this method, a welding region and its peripheral region of steel sheets to be welded by a pair of electrodes are divided into a plurality of elements. A coupled analysis is performed such that a temperature, a metal structure, stress and strain at each element are determine in a mutually associated manner based on Joule loss obtained through a current analysis and a magnetic field analysis for each element. The coupled analysis is repeated to predict an effect of one or more parameters, including at least one of a frequency, a magnitude and an application time of electric current to be applied to the electrodes, a cooling time, a pressure applied from the electrodes to the steel sheets and a shape of the electrodes, on welding quality after a post-heating by direct resistance heating and to improve weld strength.

Direct resistance heating simulation method

A wire heating system includes an induction heating apparatus having a power supply and an induction coil arranged to heat a wire rod by an induction heating using current supplied from the power supply, and a controller configured to control the current to be supplied to the induction coil based on a feeding speed of the wire rod. The induction heating apparatus has a heating section in which the wire rod is heated by the induction heating using the induction coil, and a soaking section located downstream of the heating section to homogenize the temperature distribution of the induction-heated wire rod. The controller is configured to control the current to be supplied to the induction coil such that a temperature of the wire rod at a downstream end of the soaking section becomes a target temperature.

Wire heating system and wire heating method

In an induction heating coil for heating a shaft member having multiple steps, annular conductors are separately disposed in the axis direction, the annular conductors having inner diameters so as to form predetermined gaps with outer peripheries of heating portions of the shaft member, the lengths of annular conductors (and) are set so that the areas of the respective heating portions are approximately equal to each other, and the annular conductors are connected to each other in series, so that the respective step shaft portions of the shaft member are uniformly heated. The annular conductors described above may be formed to have shapes in conformity with the shapes of the heating portions of the shaft member and may be formed to have a step shape corresponding to steps of the shaft member having different outer diameters. In addition, at least one annular protrusion is provided for at least one of the annular conductors at a place corresponding to a root of a step of the shaft member so as to heat the root of the shaft.

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Tokyo, Japan

Takashi Horino