| 摘要 |
PURPOSE: A method for manufacturing fitting of the end part of a refrigerant circulation pipe for automobile is provided to reduce manufacturing cost by minimizing loss of a raw material due to formation of remnant and minimize time required for manufacturing by omitting a separate heat treatment process after manufacturing. CONSTITUTION: The method for manufacturing fitting of the end part of a refrigerant circulation pipe for automobile comprises a material preparation process of cutting an aluminum pipe (P') having a desired diameter to a desired length; first drawing process of bending the one end part (P'-1) of the pipe (P') by hitting a punching head(10) on the inner side of a space part(11) of which the inclined surface(12) having a small angle is formed onto one end part (P'-1) of an aluminum pipe (P') using an instantaneous pressure; second drawing process of bending the end part (P'-1) of the pipe (P') by hitting a punching head on the inner side of the space part(11) of which the inclined surface having an intermediate angle is formed onto the end part (P'-1) of the aluminum pipe (P') that is bent to a small angle using an instantaneous pressure; a shape finishing process of bending the end part (P'-1) of the pipe (P') perpendicularly to the outer diameter of the aluminum pipe (P') by hitting a punching head having a perpendicular compression surface onto the end part (P'-1) of the aluminum pipe (P') that is bent to an intermediate angle in the second drawing process using an instantaneous pressure; and a piercing process of forming a through hole on the center of the end part (P'-1) of the aluminum pipe (P') that is perpendicularly bent using a boring machine.
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