Rotary bending tool and method of manufacture
A rotary bending tool having a series of graphite plugs mounted in a saddle recess engaging a rocker surface to lubricate the same. The rocker is machined in an unhardened state and thereafter heat treated to be hardened, with reverse bending of the rocker thereafter carried out to correct any warpage.
1. A rotary bending tool, comprising:
a saddle comprised of an elongated member formed with a partially cylindrical open recess extending lengthwise along said saddle;
a rocker comprised of an elongated member having a partially cylindrical outer surface fit to said partially cylindrical portion of said saddle recess, said saddle recess to allow relative rotation therein, said saddle partially encircling said rocker to capture the same;
said rocker having a V-shaped recess extending lengthwise along said rocker, said V-shaped recess positioned to face away from said saddle recess with said cylindrical saddle recess and said partially cylindrical surface of said rocker interfit together;
a series of pins each received in respective one of a series of holes in said saddle and entering a respective one of a series of pockets formed into said cylindrical surface of said rocker;
a spring associated with each pin holding said pin in said respective pocket of said rocker;
a series of oil impregnated graphite plugs mounted in a respective one of a series of pockets formed into a surface defining said saddle recess, said plugs each having an end engaging said rocker cylindrical surface, said series of plugs distributed along the length of said saddle recess, thereby lubricating said rocker cylindrical surface.
2. The rotary bending tool according to claim 1 wherein said series of graphite plugs are arranged in two side by side rows extending along said saddle recess.
3. The rotary bending tool according to claim 1 wherein each of said graphite plugs have an arcuately contoured end in engagement and conforming with said rocker cylindrical surface.