Tungsten Carbide Thread Machining

The external threads of tungsten carbide are processed using CNC turning or precision grinding machines, while the internal threads of tungsten carbide are processed using CNC milling, EDM (Electrical Discharge Machining), or tapping. The tools used are Cubic Boron Nitride (CBN) or Polycrystalline Diamond (PCD). The appropriate processing technique is generally selected based on the accuracy requirements or the product batch size. Internal tungsten carbide threads processed through EDM can have a minimum diameter of 1.5mm or M2 threads, with tolerances controlled within 0.01mm. Generally, the accuracy requirements for thread processing are not high, except for those requiring higher precision on product forming surfaces, such as the threaded joints of water pipes or the threads on cosmetic bottles.

Techniques for Tungsten Carbide Thread Machining

1. Internal Threading

• EDM (Electrical Discharge Machining):
  • Application: Best suited for creating precise internal threads in tungsten carbide, especially for diameters as small as 1.5mm or M2 thread.
  • Precision: Achieves high accuracy with a tolerance of up to 0.01mm, making it ideal for applications requiring meticulous detail.
  • Cost: While highly accurate, EDM is more expensive due to its slow rate and the specialized equipment required.
• Milling Machines:
  • Application: Effective for cutting larger internal threads.
  • Advantages: Offers versatility and ease of machining, which is advantageous for less precision-critical applications.

2. External Threading

• Precision Grinding Machines:
  • Application: Utilized primarily for high-precision external threads on hard alloys.
  • Features: Grinding machines provide a smoother finish and high precision, often used in settings like mold factories where utmost accuracy is required.
• CNC Turning:
  • Application: Suitable for both internal and external threading with moderate precision.
  • Efficiency: CNC machines offer high-speed production, making them better suited for larger production volumes where time efficiency is critical.
  • Limitations: May not be ideal for very small or highly precise internal threads.

Our factory business: We design, develop and produce powder metallurgy moulds, carbide parts, powder injection moulds, stamping toolings and precision mould parts. Whatsapp:+8618638951317. Email: [email protected], 

Choosing the Right Method

The selection of a thread machining technique for tungsten carbide depends on several factors:

• Thread Size and Complexity: Smaller, more complex threads may necessitate the use of EDM, while larger threads can be effectively machined using CNC or milling methods.
• Precision Requirements: High-precision threads, such as those used in aerospace or luxury goods, might require grinding or EDM.
• Production Volume and Cost Efficiency: High-volume orders where cost and time efficiency are paramount might benefit from CNC machining.

Additional Considerations

• Surface Treatment: Post-machining treatments can enhance the corrosion resistance and mechanical properties of tungsten carbide threads.
• Quality Control: Rigorous inspection processes are critical due to the precision required in thread machining. Techniques such as optical measuring and laser scanning provide accurate assessments of thread quality and dimensions.

Conclusion

Tungsten carbide thread machining requires careful consideration of the machining method based on the application’s specific requirements. Each technique offers distinct advantages, whether it’s the precision of EDM or the efficiency of CNC turning. For comprehensive solutions in tungsten carbide machining, collaboration with experienced technicians and the use of advanced equipment are essential to meet the demanding specifications of today’s industries.