| 摘要 |
PURPOSE:To execute junction with high strength, by making a sintered hard alloy and a steel member press-contact directly with each other, melting a press- contact surface of the steel member in the shape of a slit by a high energy beam, and depositing it onto a press-contact surface of the sintered hard alloy. CONSTITUTION:To the inside of a sintered hard alloy ring 5, a steel ring 6 is fitted and made to tightly adhere by means of cold-fitting. Subsequently, an electronic beam or a laser beam 3 is irradiated to the end part of a press- contact surface A of both, a molten layer 7 is formed on the press-contact surface A of the steel material side, and the sintered hard alloy ring 5 and the steel ring 6 are junctioned. As a result, the center part where stress is put to the maximum consists of direct junction of the sintered hard alloy and the steel material, a crack due to a junction layer is not generated, and the resistance to fatigue is raised as a whole. Also, as for the junction surface A of the steel member, a soft quality is better, and as for the quantity of carbon, <=0.5wt% is desirable, and as for the part except the junction surface A, it is preferable to increase the abrasion resistance by raising its hardness by means of carburization and quenching. |
