Hitachi-high-technologies Corporation

Nkk Corporation

Yuki Sugawara

Yuji Watanabe

Akira Sakai

Giichi Matsuo

Susumu Okawa

Koji Okushima

Fujio Onishi

Soichi Aoyama

Hiroshi Touda

Hidenori Anai

Tetsuji Osawa

Nobuyoshi Hamura

Bunnosuke Ushioda

A light signal detecting circuit, a light amount detecting device, and a charged-particle-beam device capable of discriminating the signal component of a small amount of light from the signal component of noise due to dark current. A data-processing-unit detects pulses from digital voltage signal corresponding to an amount of light obtained by an amplifier and an A-D converter, calculates a crest value as the maximum voltage value of each pulse, and stores the occurrence frequency of each calculated crest value in a frequency occurrence storage area. A data analysis unit compares a previously-determined frequency lower limit with the occurrence frequency of each crest value in ascending order of the crest values and sets a pulse determination threshold to the first crest value whose occurrence frequency is equal to or smaller than the frequency lower limit. The threshold processing unit thus outputs the digital signal higher than the pulse determination threshold.

Light signal detecting circuit, light amount detecting device, and charged particle beam device

A method for removing burrs in a continuous rolling process including the steps of joining the rear end of a preceding billet with the front end of a succeeding billet using a flash butt welding method while both billets are moving, and grinding a burr on the welded part of the joined portion using a plurality of grinders while the billets are moving and while rotating the grinders and moving the grinders synchronously with the travelling speed of the billets. A grinding machine for continuously rolling a round billet includes a travelling body shuttling along the direction of movement of the round billet, a turret ring rotatably supported by the travelling body, and a plurality of grinding devices arranged in a movable manner within a radius of the turret ring, wherein the grinding devices include grinders which are set at a tilted angle relative to the center axis of the rotatable turret ring. A grinding machine for continuously rolling a rectangular billet includes a travelling body moving along a moving direction of the rectangular billet, two pairs of grinding devices located at a front side and a rear side, respectively, of the travelling body and having grinders which rotate on a plane facing the rectangular billet and along a longitudinal direction of the rectangular billet, a moving device for moving the grinding devices in a right angle direction relative to the rectangular billet, and a device for moving the grinders to come close to and apart from the rectangular billet.

Method and apparatus for removing burrs from joined billets in a

Growing community of inventors

Tokyo, Japan

Yuki Sugawara