| 摘要 |
PURPOSE:To obtain a composite tool having high joint strength without cracking by interposing a thin metallic sheet or plating layer on the joint surface between a sintered hard alloy and a steel, pressing the same, an irradiating a high energy beam to the sintered hard side to diffuse heat energy on the steel side. CONSTITUTION:A thin metallic sheet of <=0.5mm. is sandwiched between the joint surfaces of a sintered hard alloy and a steel or a plating layer is provided on both or either of the sintered hard alloy and the steel. The assembly is set in the state of pressing the above-mentioned joint surfaces into a vacuum vessel. The above-mentioned intermediate layer is constituted of Fe, Co, Ni, Cu or the alloy thereof. Such a high energy beams as an electron beam or laser beam is irradiated to the sintered hard side in proximity to the joint surfaces to increase the temp. of the sintered hard alloy and to diffuse the heat energy thereof to the steel side, thereby diffusion-joining the sintered hard alloy and the steel. The joint part of different materials having high strength is thus obtd. and the generation of a crack in the sintered hard alloy side arising from the joining is prevented. |
