0CALL US +39 0522 27 11 17

THREAD ROLLING

Thread rolling is a cold-forming process used to produce threads on screws and bolts. This method is preferred over other threading processes due to its ability to create high-quality threads with greater tensile strength and a smoother surface finish. Unlike material removal processes, thread rolling plastically deforms the material, enhancing the mechanical properties of the component.

Thread Rolling Process

The thread rolling process involves the use of profiled rollers that press against the raw material, forming the desired thread profile. This method offers several advantages over chip-removal threading:

  1. Increased Strength: Thread rolling enhances fatigue resistance by creating a compressed and burr-free surface.
  2. Smooth Surface: The produced threads are smoother and more uniform, reducing friction during screwing.
  3. Efficiency: The process is fast and can be automated, increasing productivity.
  4. Waste Reduction: No material is removed, meaning there are no chips or machining waste.

Steps of the Thread Rolling Process

  1. Material Preparation: The raw material is cut to the desired length.
  2. Rolling: Profiled rollers plastically deform the material to create the thread.
  3. Quality Control: Threads are inspected to ensure they meet required tolerances.

Improved Mechanical Properties

Property Before Rolling After Rolling
Tensile Strength 600 MPa 800 MPa
Surface Hardness 200 HV 250 HV
Fatigue Resistance 100,000 cycles 200,000 cycles

Graph: Increase in Tensile Strength

The graph illustrates the increase in tensile strength of rolled threads compared to non-rolled threads.

Applications of Thread Rolling

Thread rolling is widely used in various industries, including:

  • Automotive: Used for producing critical bolts and screws in engines and transmissions.
  • Aerospace: Used for structural components requiring high strength and reliability.
  • Construction: Used for screws and bolts in steel structures and heavy equipment.
  • Electronics: Used for small screws requiring precision and strength.

Conclusion

Thread rolling is an advanced solution for companies looking to enhance the quality and strength of their threaded components. With its ability to produce stronger and more durable threads, this process is ideal for critical applications where reliability is essential.