The solid carbdie grade selection for high performance solid carbdie drills

Drilling is one of the most common operations used to make a hole in steel, stainless steel, cast iron, and non-ferrous and high-temperature materials. Fidelity tools offers a full line of versatile and material-specific solid carbide drills that are designed to perform in general-purpose, multi-purpose, and high-volume production environments.

What is solid carbide drills

Carbide drill bits are the high-end option in manufacturing and CNC (Computer Numeric Control) machining environments. Carbide drills provide faster cutting rates, longer tool life, better positional and dimensional accuracy and improved surface finish. As result, Solid carbide drills are a great option for excellent process security, manufacturing economy and good hole quality.

Solid Carbide drill bits are made from tungsten carbide, a chemical compound of carbon, tungsten and cobalt. This powder is joined by a process called sintering to form solid carbide rods. At 82 HRC, give or take, tungsten carbide is much harder than the traditional tool steel materials, like cobalt or HSS. This extremely hard and wear-resistant material provides faster cutting speed, more durability, and longevity. As a result, it’s a popular choice for tough jobs。

Why choose solid carbide for drilling application

For modern machining industry, productivity is the key for the company business success. The high productivity normally means high cutting speed and high feed rate, which is very challenging conditions for cutting tools as so much heat is generated especially for drills application. With the industry development, the industry need the increasingly efficient tools to meet the extreme demands of machining.

The cutting temperature increases with the cutting speed. Higher cutting speed and high feed rare means high material remove rate, which in will cause extremely high temperature. For drills application, the cutting temperature can reach the range from 800-1100 degree or even higher, as it is not easy to reduce the amount of heat in the hole. As we can see from the graph below, the carbides is the suitable choice to meet this challenge, which can maintain the hardness even at 1000 degree. Compared with Ceramics, the toughness of carbides is more suitable for drilling to meet the high torque force requirement.

Due to the increased cutting values, tool life and improved drilling quality, carbide tools are ideal for series and large-scale production on CNC machines with stable clamping. Solid carbide drills are suitable for particularly demanding machining tasks where high wear resistance and efficiency are required.

Why Fidelity tools choose  the special sub-micron grain carbide grade for the high performance drills

There are many different carbide grades available in the market. Different carbide carbides have different chemical contents, grain structures and grain size types and density, which will perform totally different ware resistance and toughness. So, grade selection is crucial to meeting today’s strict quality requirements and technical challenges, while maximizing productivity.

An increase in cobalt content results in increased toughness while hardness and wear resistance are reduced. This opposite development of the two desirable parameters, hardness and toughness, can be countered by reducing the carbide grain size. Form the graph below from Ultra Carbide inc, we can find out the impact of grain size and Co-content on hardness.

the properties and correlation of the Carbide grades

the properties and correlation of the Carbide grades

To balance the ware resistance(hardness) and toughness, Fidelity tools select the carbide grade with 10% cobalt content and sub-micron grain (grain size 0.5-0.8um) to achieve excellent toughness and wear resistance. The carbide has excellent wear resistance properties and therefore reduces the amount of material that needs to be removed when re-grinding. Based on many customers hands-on feedback, this carbide grade is perfect for universal application.

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