Method of manufacturing control arm using variable curvature extruding process and double-hollow-typed control arm manufactured thereby

A double-hollow type control arm manufactured by variable curvature extrusion molding, comprising:

• a base plate that is connected with a bump stop cup, a lower end of a spring being positioned on the bump stop cup, by caulking;
• a body plate that integrally protrudes from the base plate and has a closed hollow profile cross section with double walls therein, the double walls being defined by a main cavity having a closed inner space and left and right cavities formed at left and right sides of the main cavity, the left and right cavities having the same width;
• a carrier fastening end that is composed of a pair of flanges that extend from the body plate and are spaced apart from each other when the base plate is not connected to another member;
• and
• a bush fastening end that is composed of a pair of flanges that are spaced apart from each other and formed by integral connection of the base plate and the body plate, at a side opposite to the carrier fastening end,
• wherein the main cavity has the same width as the width of the bush fastening end and the width between left and right cavities including the main cavity is the same as the width of the carrier fastening end.