A METHOD FOR MANUFACTURING OF TURBO CHARGER IMPELLER USING FORGED PROCESS

摘要

The present invention relates to a method of manufacturing an impeller for a turbocharger using forging processing, and more specifically, as a method of manufacturing an impeller for a turbocharger using forging processing, comprising: (1) preparing a preform for manufacturing an impeller; (2) forming a first forging molded body through a first forging process in which a specific pressure is applied to the preform prepared through step (1) in a forging mold; (3) The first heat treatment solution treatment process and hot water after the first heat treatment solution treatment process to enhance the strength and hardness of the mechanical properties of the preliminary impeller molded into the first forged body through step (2) above? Performing a quenching treatment process; (4) Secondary forging molding by applying a specific pressure in the forging mold for the second forging of the preliminary impeller of the first forging molded body that has undergone the first heat treatment solution treatment process and the quenching treatment process through step (3) above Forming a secondary forged molded body through processing; (5) performing a secondary heat treatment solution treatment and aging treatment process on the pre-impeller of the secondary forged body formed through the secondary forging process through the step (4); And (6) processing the preliminary impeller of the secondary forged molded body subjected to the secondary heat treatment solution treatment and aging treatment through the step (5) through machining equipment to complete the manufacture of the impeller. It is characterized by its construction. According to the method of manufacturing an impeller for a turbocharger using forging processing proposed in the present invention, the first forging treatment, the first heat treatment solution treatment and quenching treatment, the second forging treatment and the , Secondary heat treatment solution treatment, aging treatment, and machining treatment are sequentially performed, but after the first heat treatment solution treatment process, the quench treatment is treated with hot water at a specific temperature instead of room temperature water, thereby precision casting Porosity, cracks, warping, dimensional deformation, hot cracks due to residual stress remaining inside the product during casting, and dimensional accuracy, etc., which may occur in the product, are effectively improved, and the S/N curve strength of the impeller is thereby improved. You can make it better. In addition, according to the method of manufacturing an impeller for a turbocharger using the forging process of the present invention, impeller products having excellent mechanical properties can be mass produced through a forging process and a heat treatment process, and thus price competitiveness can be further improved. have. In addition, according to the method of manufacturing an impeller for a turbocharger using forging processing of the present invention, manufacturing cost is reduced compared to the conventional method of manufacturing an expensive forged raw material by machining, as well as productivity and dimensions of precision casting. It is possible to solve the problem of precision and mechanical defects (strength, hardness), and make it possible to manufacture an impeller having characteristics requiring high precision and high rigidity.