Types of Thread Rolling

Infeed Rolling

Infeed rolling utilizes a timed machine cycle. This is used for general rolling of parts up to the maximum length of dies, and also shouldered or headed work pieces.

In infeed rolling, the helix angle is ground into the dies. The work piece and the dies are kept parallel on the machine. The work piece rotates between the dies, but has little or no axial movement. By using a continuously timed cycle, production is greatly increased.

Thrufeed Rolling

Thrufeed rolling is used for rolling threads which exceed the maximum length of the dies. It is also used for continuous rolling of long threaded bars.

In thrufeed rolling, the most commonly used die is the annular ring type. The thread form is ground on the die in straight rings with no helix.

The helix angle is produced by tilting the spindles on the machine to the same helix as work. Both dies rotate in synchronism when rolling is being done. The work piece rides between the dies on a support blade. Multiple start threads (within range of machine) can be rolled by increasing helix angle tilt on the machine.

Multiple start high helix threads and worms can be rolled with helical slow feed dies where part of the helix is ground into the die and part is tilted on the machine spindles. Speed-up dies are used for high speed thrufeed rolling.

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