Locking arm of a carrier connecting rod and method for making the same

A method for manufacturing a locking arm of a carrier connecting rod comprising the following steps:

• step S1:
• preparing a strip of metal sheet;
• step S2:
• placing the metal sheet in a first stamping die which presses the metal sheet to form a first half-finished product, the first half-finished product including a front section, a bent middle section, and a rear section, the front section having an aperture, the bent middle section having a positioning hole, and the rear section having a pivotal hole;
• step S3:
• preparing a second stamping die, the second stamping die having a circular groove which is located corresponding to the bent middle section, placing the first half-finished product in the second stamping die and pressing the first half-finished product to form a second half-finished product, the bent middle section being pressed through the circular groove of the second stamping die to form two arc-shaped portions respectively protruding from an upper side and a lower side of the bent middle section, the bent middle section being formed to include a recessed area, the positioning hole being centered formed to the recessed area, an inner periphery of the positioning hole being formed to be a conical positioning hole, a surplus material generated corresponding to the aperture, the positioning hole, and the pivotal hole during the step S2 being deburred, and
• step S4:
• placing the second half-finished product into a plastic mold, injecting plastic to cover the front section and the aperture to form an L-shaped stopper, resulting in the locking arm.