Technical information for thread rolling
The feasibility of this process depends mainly on four factors: the material to be rolled, the profile to be rolled, the machine and the tool to be used.
Preparation of the parts to be threaded
- Bevels: with an angle of 22º 30′ +/-2º
- Pre-rolling diameter: The one that corresponds to the piece to be rolled.
- Hardness of the piece: homogeneity in the hardness of the pieces to be laminated and hardness not higher than 30-23 HRc, always depending on the profile to be made.
If the material is very hard, it is necessary that the bevels be 15º instead of 22º. For the pre-rolling diameters of the pieces cannot prescribe absolute values but for information purposes we can quote the following formula.