THE SECRET OF OUR PRODUCT QUALITY LIES IN THE PRODUCTION PROCESS
Thread rolling is a cold deformation process which involves (as in any permanent deformation process) the material being stressed beyond the elastic limit, becoming plastic, and changing shape. From a technical viewpoint, rolled threads feature high-precision profiles. The pressure-polished surface also offers much better corrosion resistance.
The resistance of the raw material improves in the areas deformed by rolling and the compressive strength is much higher than that of threads made using the conventional cutting or grinding methods. A pre-load pressure system is created at the base of the thread, which improves resistance to alternating stresses, while also lengthening the product’s working life. What is more, the metal fibres have no cuts or breaks in them, instead, they follow the course of the thread itself and thereby guarantee against breakage.
ADVANTAGES OF ROLLING: IMPROVEMENT OF MECHANICAL FEATURES
Cold working of the surface increases the TENSILE STRENGTH of the material being processed, and static tension tests have frequently shown increases with respect to normal levels. Also, since instead of cutting the material’s fibres (as occurs in conventional methods), thread rolling involves the fibres being remodelled as solid lines that follow the contours of the thread, the TORSIONAL STRENGTH is SIGNIFICANTLY HIGHER THAN AVERAGE. Finally, given the greater grip guaranteed by the polished finish of rolled threads, fatigue resistance increases with respect to normal levels.
In addition to triangular threads, rolling can be employed to produce trapezoidal threads, special threads, and knurling.