MANUFACTURING METHOD OF LOW ARM

摘要

PURPOSE: A low arm manufacturing method is provided to implement a local induction heat treatment on the area on where load is concentrated in a single plate type low arm using heat-treated hardened steel, thereby improving the surface stiffness on the area with a weak structural stiffness. CONSTITUTION: A low arm manufacturing method comprises the following steps of: forming a low arm main body by the use of heat-treated hardened steel(S210); and preparing a reinforcement part by implementing a heat treatment selectively on the area of the low arm with weak structural stiffness(S220). The reinforcement part which is heat-treated has higher stiffness than other parts. [Reference numerals] (AA) Start; (BB) End; (S210) Forming a low arm body; (S220) Induction heating; (S230) Cooling;