| Thread Rolling Types |
Code |
Conditions and Notes |
Illustration |
| In-Feed |
IF |
Applicable to thread length of the working pieces not exceeding the length of the rolling machine. |
 |
The working piece is conveyed between the two thread rollers, where the rollers press and eject along the radial direction of the working piece. This accomplishes the cold forging threading process of the screw product.
(The axis of the two thread rollers are at angles of zero degrees; without machined angle) |
| Retreat-Feed |
RF |
Applicable to thread length of the working pieces longer than the rolling machine, and the entire piece is not rolled. |
 |
The two rollers comprise a fixed roller at the left and a movable roller at the right. The working piece is placed in between the two rollers and the movable roller presses and grabs the working piece for rolling. After the required length has been achieved, the movable roller ejects it and the piece is completed.
(The axis of the two thread rollers are at the lead angle; machined angle = lead angle) |
| Thru-Feed |
TF |
Applicable to thread length of the working pieces longer than the rolling machine, and the entire piece is rolled regardless of the outer diameter. |
 |
The working piece is placed in-between the two thread rollers, where the working piece is rolled and completed.
(The axis of the two thread rollers are at the lead angle; machined angle = lead angle) |
| Thrust-Rolling |
TR |
Applicable to higher precision screws and tight fittings |
 |
The working piece is placed in between the two thread rollers, where the working piece is rolled and completed.
(The axis of the two thread rollers are at an angle; machined angle < lead angle) |
