How to choose carbide drill bits?

At present, the use of cemented carbide drills in machining and manufacturing accounts for about 1/5 of the total processing. In addition, cemented carbide drills have high hardness, strength, wear resistance and corrosion resistance, and are favoured by processing enterprises.


carbide drill bits


How to choose carbide drill bits?


The selection of cemented carbide drill bits should be selected according to the usage scenarios. The following are some common usage scenarios.


1) Used in advanced machining centres


Select the solid carbide drill bit, which is made of fine-grained carbide material. In order to prolong the service life, it is also coated. The specially designed geometric edge shape makes the drill bit self-centring. It has good chip control and chip removal performance when working with workpiece materials.

2) Used on lathes and other rotary processing machines


Choose cemented carbide indexable insert drills, which have a wide range of machining apertures and a processing depth range of 2D to 5D (D is the aperture).


3) Machining centres, CNC lathes or other high-rigidity, high-speed machine tools


Choose between welded carbide drills or replaceable carbide crown drills, which have a solidly welded carbide crown on a steel body or a steel body with replaceable solid carbide crowns combined. Self-centring geometric edge type, small cutting force, good chip control for most workpiece materials, good surface finish of the machined holes, high dimensional accuracy and positioning accuracy, and no need for subsequent finishing.


carbide drill bits


What are the types of carbide drills?


Although there are many carbide drills, there are actually only four basic types, namely: solid carbide drills, carbide indexable insert drills, welded carbide drills and replaceable carbide crown drills.

The use of cemented carbide drills can improve tool life and cutting speed, and can significantly improve cutting efficiency when used in the processing of brittle and hard materials such as cast iron, insulating materials, and glass. Especially materials that are difficult to process, such as high manganese steel, must be processed with cemented carbide drills.


Carbide drill material


Carbide drills are mainly made of cobalt-based cemented carbide or tungsten steel, which have high hardness, high wear resistance and good cutting performance. Generally speaking, the wear resistance of cobalt-based cemented carbide drills is better, but the price is relatively higher, while the price of tungsten steel drills is relatively low, which is more suitable for general drilling.


Carbide drill diameter and length


The diameter and length of a carbide drill bit are very important parameters, the diameter is usually measured in millimetres (mm) and the length is usually measured in centimetres (cm). To choose the proper drill diameter and length, you need to consider the depth and diameter of the hole, and you need to ensure that the drill can move freely on the workpiece without excessive sticking or chattering. When determining the diameter and length, different sizes should also be selected according to different drilling tasks and requirements.


The number of edges of the carbide drill bit


The number of edges of a cemented carbide drill is usually 2-4. The more the number of edges, the faster the drilling speed, but it will also exert greater pressure on the drill, which may easily lead to breakage or damage. When selecting a cemented carbide drill bit, the appropriate number of edges should be selected according to the requirements of the drilling task and the nature of the workpiece.


Surface Coating of Carbide Drill Bits


The surface of the cemented carbide drill bit can kill insects, graphene, and various coatings such as money, oxides, nitrides, etc., which are durable, high temperature, wear-resistant, anti-fouling, and reduce friction. These coatings reduce wear and friction and improve cutting performance. When selecting cemented carbide drill bits, the appropriate surface coating should be selected according to different requirements.


Suggestions for purchasing cemented carbide drill bits


1) According to the requirements of the drilling task, select the appropriate material and the diameter, length and number of edges of the carbide drill.

2) The appearance and surface coating of the drill bit should be checked before purchasing to ensure that there are no defects and damages.

3) Before buying, you should refer to the evaluation and opinions of other users to choose high-quality carbide drill bits.

4) When using cemented carbide drills, the speed and feed rate of the tool should be properly adjusted according to different materials and precision requirements to ensure the drilling quality.

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