Publish Time: 2023-04-10 Origin: Site
We have learned about several common types of drill bits and have a certain understanding of drill bits. As we all know, a suitable bit can not only improve the work efficiency, but also save the engineering cost to a great extent. So, how should we choose the right bit? This article will answer for you.
The following is a list of contents
Material of drill bit
Coating of drill bit
When selecting the drill bit, we should first consider the material of the drill bit, which is the most important point. The materials commonly used to form drill bits in the market can be roughly divided into three types, namely high-speed steel, cobalt containing high-speed steel and integral cemented carbide.
Since 1910, high-speed steel has been used as cutting tools for more than a century. It is the most widely used and cheapest cutting tool material at present. High-speed steel bits can be used not only in electric hand drills, but also in drilling machines and other environments with better stability. Another reason for the durability of high-speed steel may be that the cutting tools made of high-speed steel can be polished repeatedly, and due to the low price, high-speed steel can not only be used to grind into drill bits, but also be widely used in turning tools.
Cobalt containing high-speed steel has better hardness and red hardness than high-speed steel. The improvement of hardness improves its wear resistance, but also sacrifices part of its toughness. Like high-speed steel, they can be used more often by grinding.
Cemented carbide is a metal matrix composite. Cemented carbide takes tungsten carbide as the matrix and some other materials as the binder. It is sintered by hot isostatic pressing and made by a series of complex processes. Compared with high-speed steel, cemented carbide has a great improvement in hardness, red hardness and wear resistance, but its cost is also much more expensive than high-speed steel. Cemented carbide has more advantages in tool life and processing speed than previous tool materials. In the repeated grinding of tools, professional grinding tools are needed.
According to the scope of application, the coating of drill bit can be roughly divided into the following five types: no coating, black oxide coating, titanium nitride coating, titanium carbonitride coating and aluminum titanium nitride coating.
Uncoated tools are the cheapest. They are usually used to process soft materials such as aluminum alloy and low carbon steel.
Oxidation coating can provide better lubricity than uncoated tools, better oxidation resistance and heat resistance, and can increase the service life by more than 50%.
Titanium nitride is the most common coating material, which is not suitable for processing materials with high hardness and high processing temperature.
Titanium carbonitride is developed from titanium nitride and has higher temperature resistance and wear resistance, usually purple or blue.
Aluminum titanium nitride is more resistant to high temperature than all the above coatings, so it can be used in higher cutting environment. For example, processing superalloys. It is also applicable to the processing of steel and stainless steel. However, due to the element containing aluminum, chemical reaction will occur when processing aluminum, so it is necessary to avoid processing materials containing aluminum.
Generally speaking, cobalt containing drilling plus titanium carbonitride coating or titanium nitride coating is a more economical solution.
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