a machine used to produce springs, spring washers, and collar springs from wire and rods. There are both automatic and semiautomatic machines. Helical, cylindrical, conical, and contoured springs are made by either hot or cold coiling on spring-coiling machines.
The major units of a spring-coiling machine include the drive, which is usually electric, the straightening and coiling units, and the pitch and cutting mechanisms. Cold coiling on automatic spring-coiling machines is most commonly found. These machines are characterized by discontinuous wire feed from two or three pairs of rollers driven by a gear sector or engaged by a friction clutch. The springs are cut off when the rollers stop. There are also spring-coiling machines with continuous wire feed in which the springs are cut without stopping the rollers, which results in an increased output.
In addition to its basic mechanisms, a spring-coiling machine may also have various attachments and monitoring and adjustment devices. Spring-coiling machines are used mainly in series and mass production. Automatic spring-coiling machines produce up to 250 springs or 2,200 spring washers per minute.
E. G. BELKOV and G. A. NAVROTSKII