Daido Tokushuko Kabushiki Kaisha

Toshio Endo

Katsuhiro Kojima

Ryuzo Yamada

Nobuo Ishikawa

Tomikazu Yagi

Taizo Yano

Kazuo Watanabe

The surface of the member to be inspected is covered with powder deposited by using, for example, static electricity prior to the flaw detection. The member surface is covered so as to be partly exposed by setting the average thickness of the powder layer to 0.1D-0.6D, where D is the average particle diameter of the powder, under an assumption that the powder particles in the powder layer are virtually leveled into a uniform thickness film. Subsequently, the surface region of the member is heated by high frequency induction heating, and then the temperature distribution on the surface is measured with a radiation thermometer. The part for which the temperature measured is different from the surroundings is judged as a flaw. The surface of the member is covered with the powder so that the surface emissivity becomes almost uniform, and the resulting temperature distribution measured with the radiation thermometer becomes almost equal to the real one. Therefore, flaws existing on the surface of the member are precisely detected according to the measurement with the radiation thermometer even in the case that there are parts of low emissivity, such as handling marks, on the surface.

Method and an apparatus for flaw detection

An automatic deseaming apparatus for an elongate block of metallic material comprises a defect marking detector for detecting defect markings which consist of a material containing a fluorescent pigment and have been deposited on defects in the surface of the block, a defect marking position detector for detecting the positions of the defects, a memory for storing the positions of the defect markings which are within the entire area or a predetermined one of segmented areas of the surface of the block, and a grinding controller for controlling reciprocative grinding action in the direction of the longitudinal axis of the block according to the defect marking informations stored in the memory.

Automatic deseaming apparatus for elongate block of metallic material

Growing community of inventors

Aichi-ken, Japan

Toshio Endo