Mitsubishi Hitachi Power Systems, Ltd.

Mitsubishi Heavy Industries Limited

Keiko Shishime

Koki Sato

Takeshi Kudo

Hideo Yoda

Kunio Asai

Hideyuki Nomura

Katsumi Tanaka

Yurika Nagai

Atsuya Hirano

Kazuto Mikazuki

Yasuyoshi Harashima

Takeshi Kashiwagi

Takafumi Wakasa

Masayoshi Ohhira

Shuichi Ishizawa

This high-frequency hardening apparatus is provided with: an induction heating coil which has a U-shaped part that sandwiches a turbine blade, a pair of linear parts, and a connection part connecting the U-shaped part and the linear parts; a temperature detection unit which detects, in a non-contact manner, temperature around the induction heating coil; a moving mechanism which relatively moves the turbine blade and the induction heating coil in the direction of blade height; an electrical current supply unit which supplies a high-frequency electrical current to the induction heating coil; and a control device which has an electrical current control unit that, on the basis of a detection value provided by the temperature detection unit, controls the magnitude of the high-frequency electrical current supplied from the electrical current supply unit such that the detection value will not exceed a predetermined temperature.

High-frequency hardening apparatus

A burnishing device and method are provided that enable burnishing processing to be reliably performed on a surface included in an object to be processed and having a change in height and inclination angle. The device includes a burnishing tool having a pressing unit that rotationally presses a surface of an object to be processed, the surface having a change in height and inclination angle; a tool driving device configured to move the burnishing tool; a strain sensor configured to detect the strain amount of the burnishing tool; and a computer that calculates pressing force to be applied by the pressing unit in a normal direction of the surface of the object to be processed, calculates correction amount of displacement of the tool driving device in a pressing direction based on calculated pressing force and stored pressing force in advance, and outputs the correction amount to the tool driving device.

Burnishing device and burnishing method using it

A steam turbine having a fork-type joint structure is provided that secures sufficient strength for endurance of stress corrosion cracking, low-cycle fatigue, and high-cycle fatigue, and extends an operating life while making it possible to endure long-term operation. The turbine includes a rotor having a plurality of rotor forks rowed in an axial direction; a turbine blade having blade forks arranged in the axial direction of the rotor, the blade forks engaged with the rotor forks; a plurality of pin holes whose positions are different from each other in the radial direction of the rotor; and a plurality of fork pins inserted into the plurality of pin holes in the axial direction of the rotor. A clearance exists between an inner diameter of the pin hole of the blade fork and a diameter of the fork pin, the clearance varying depending on positions in the axial direction of the turbine.

Steam turbine

Growing community of inventors

Tokyo, Japan

Keiko Shishime