Surface heat treatment for inner face of tube

Abstract

Abstract PURPOSE:To uniformly execute heat treatment in inner face of a tube by using conical type reflecting mirror spreading a beam with a concave lens to uniformly apply the beam on the circumference in inner face of a tube and shifting the tube or optical system to axial direciton. CONSTITUTION:The inner surface of the tube 9 is heat-treated with a laser beam. In this case, the laser beam 1 is generated from the oscillator 3, stopped down with an incident optical system 4 and sent to the concave lens 7 through an optical fiber 5 and outgoing optical system 6. After spreading the beam 1 with the concave lens 7, by using the conical reflecting mirror 8, the circumference in inner face of the tube 9 is irradiated by the beam, heated and heat- treated. In there, the tube 9 or the optical system composing of the concave lens 7 and the conical reflecting mirror 8 is shifted. By this method, the heat treatment can be uniformly executed to the inner face of the tube.

Inventors

• 👤 Genta Takano
• 👤 高野　元太

Bibliographic Details