Cost-effective for large volumes
Special profiles according to customer requirements
Thread rolling is a cost-effective production method for larger quantities or for standard threads. However, this method is often not economically viable for small quantities, because of the relatively high tooling costs. Based on chipless cold forming, it has a positive effect on the raw material’s properties. In contrast to machining methods, such as thread whirling, cutting, milling and grinding, the material’s natural grain orientation is not destroyed.
Thread rolling has a positive influence on the following physical and technical properties:
- Higher wear resistance: tensile strength and bending strength
- Higher surface quality of the burnished thread flanks
- Lower corrosion
- High profile accuracy of thread depending on the rolling tool quality
- High accuracy of flank diameter (parallelism) through high base material tolerance.
Plastic nuts are particularly well suited for rolled threads. The high flank surface quality of rolled threads and the low coefficient of friction of plastics result in a higher efficiency for the finished screw drive. According to DIN 103, the core diameter of rolled trapezoidal screws can be up to 015 x P smaller than that of machined trapezoidal screws (flow radius required on the thread-rolling tool). Rolled threads may have a “closing fold” (groove) on the outside diameter of the thread turn. This does not affect the quality or function of the thread. It is merely a criterion for assessing the rolling technology.