How to select a twist drill for beryllium copper?

When it comes to machining beryllium copper, selecting the right twist drill is crucial for achieving optimal results. As a twist drill supplier with years of experience in the industry, I understand the challenges and requirements associated with drilling beryllium copper. In this blog post, I will share some insights on how to select a twist drill for beryllium copper, taking into account factors such as drill material, geometry, coating, and size.

Drill Material

The choice of drill material is one of the most important factors to consider when selecting a twist drill for beryllium copper. Beryllium copper is a relatively hard and tough material, so a drill with high hardness and wear resistance is required. Here are some common drill materials and their suitability for drilling beryllium copper:

• High-Speed Steel (HSS): HSS drills are a popular choice for general-purpose drilling applications. They are relatively inexpensive and offer good cutting performance. However, HSS drills may not be the best option for drilling beryllium copper, as they can wear out quickly due to the hardness of the material.
• Cobalt High-Speed Steel (Co-HSS): Co-HSS drills contain a small percentage of cobalt, which increases their hardness and heat resistance. These drills are more suitable for drilling harder materials such as beryllium copper. They offer better wear resistance and longer tool life compared to HSS drills.
• Carbide: Carbide drills are the most expensive option, but they also offer the highest performance. Carbide is extremely hard and wear-resistant, making it ideal for drilling hard materials like beryllium copper. Carbide drills can maintain their cutting edge for a longer time, resulting in higher productivity and better hole quality.

Drill Geometry

The geometry of a twist drill plays a significant role in its cutting performance. When drilling beryllium copper, it is important to choose a drill with the right geometry to ensure efficient chip removal and prevent tool breakage. Here are some key geometric features to consider:

• Point Angle: The point angle of a drill determines the shape of the cutting edge. For drilling beryllium copper, a point angle of 135° to 140° is recommended. This angle helps to reduce the cutting force and improve chip evacuation.
• Helix Angle: The helix angle of a drill affects the chip flow and the cutting force. A higher helix angle (e.g., 30° to 40°) is generally preferred for drilling beryllium copper, as it promotes better chip evacuation and reduces the risk of chip clogging.
• Flute Design: The flute design of a drill also plays a role in chip evacuation. Drills with wide and deep flutes are better at removing chips from the hole, which helps to prevent tool breakage and improve hole quality.

Drill Coating

Coating a drill can significantly improve its performance and tool life. When drilling beryllium copper, a coating can help to reduce friction, improve chip flow, and increase wear resistance. Here are some common drill coatings and their benefits:

• Titanium Nitride (TiN): TiN is a popular coating for drills. It provides a hard and wear-resistant surface, which helps to reduce friction and improve tool life. TiN-coated drills are suitable for general-purpose drilling applications, including drilling beryllium copper.
• Titanium Aluminum Nitride (TiAlN): TiAlN is a more advanced coating that offers better heat resistance and wear resistance compared to TiN. TiAlN-coated drills are ideal for high-speed drilling applications and can withstand the high temperatures generated when drilling beryllium copper.
• Diamond-Like Carbon (DLC): DLC is a super-hard coating that provides excellent wear resistance and low friction. DLC-coated drills are suitable for drilling hard and abrasive materials like beryllium copper. They can maintain their cutting edge for a longer time, resulting in higher productivity and better hole quality.

Drill Size

The size of the drill is another important factor to consider when drilling beryllium copper. The drill size should be selected based on the required hole diameter and the thickness of the material. Here are some guidelines to follow:

• Hole Diameter: The drill diameter should be slightly smaller than the required hole diameter to allow for reaming or finishing operations. This helps to ensure accurate hole size and better surface finish.
• Material Thickness: For thin materials, a shorter drill length may be sufficient. However, for thicker materials, a longer drill may be required to reach the desired depth. It is important to choose a drill with the appropriate length to avoid tool breakage.

Our Product Recommendations

As a twist drill supplier, we offer a wide range of drills suitable for drilling beryllium copper. Here are some of our recommended products:

• 12pcs Wooden Box 1/2 Shank Sliver and Deming Drill Set: This drill set includes 12 high-quality twist drills with a 1/2 shank. The drills are made of cobalt high-speed steel and are suitable for drilling a variety of materials, including beryllium copper.
• 99pcs Straight Shank Twist Drill with Iron Box: This comprehensive drill set contains 99 straight shank twist drills in various sizes. The drills are made of high-speed steel and are coated with titanium nitride for improved wear resistance. They are ideal for general-purpose drilling applications, including drilling beryllium copper.
• 13/19/25pcs Straight Shank Twist Drill with Iron Box: This drill set is available in three different configurations (13pcs, 19pcs, and 25pcs). The drills are made of high-speed steel and are designed for precision drilling. They are suitable for drilling beryllium copper and other hard materials.

Conclusion

Selecting the right twist drill for beryllium copper is essential for achieving optimal results. By considering factors such as drill material, geometry, coating, and size, you can choose a drill that offers high performance, long tool life, and excellent hole quality. As a twist drill supplier, we are committed to providing our customers with the best products and services. If you have any questions or need further assistance in selecting a twist drill for beryllium copper, please feel free to contact us. We look forward to working with you and helping you meet your drilling needs.

References

• "Machining of Beryllium Copper," ASM International Handbook, Volume 16: Machining, 2008.
• "Twist Drill Selection Guide," Kennametal Inc., 2023.
• "Drilling Beryllium Copper: Best Practices and Tips," Sandvik Coromant, 2022.