How to use carbide drill correctly

Carbide drill bits can be used in CNC machine tools, machining centers and other machine tools with strong machining capacity and good rigidity, and the tip run-out TIR should be ensured to be less than 0.02. The material of carbide drill bit is a commonly used alloy material, which is characterized by high hardness and good wear resistance. In terms of composition, cemented carbide is made of tungsten powder and titanium powder and other main components, cobalt powder, nickel powder, etc., as a binder of one or more refractory carbides, the alloy is made of powder metallurgy. The material is made by adding metal powder as a binder. Tungsten carbide is commonly used in the manufacture of cutting tools, cold working molds and high wear resistant parts. Carbide has high hardness and wear resistance. At room temperature, its hardness can reach 69 ~ 81HRC, and the wear resistance is also very good. In this way, the cutting speed of the tool made of this material can be 4 to 7 times the cutting speed of the high-speed steel tool, and its service life is not less than the high-speed steel tool, and it can also be 5 to 80 times longer than the high-speed steel tool ten times. Can be used for cutting. High hardness material with a hardness of 50HRC. Cemented carbide has good corrosion resistance, oxidation resistance and high temperature resistance. Tools made of cemented carbide are usually resistant to corrosion caused by atmosphere, acid, alkali, etc., are not easy to oxidize, and can maintain their hardness at high temperatures of 900 to 1000 degrees. Carbide materials can be made into a variety of tools, such as turning tools, milling cutters, planers, drills, etc., suitable for different processing technologies and workpiece materials. Among these types, tungsten cobalt carbide is suitable for short chip processing of iron and ferrous metals and processing of non-metallic materials, while tungsten titanium cobalt carbide is more suitable for long chip processing of ferrous metals such as iron and iron. Steel. Similar alloys with high cobalt content are more suitable for roughing, and similar alloys with low cobalt content are more suitable for finishing.

In the past, it was thought that drilling should be done at lower feed and cutting speeds. This view has been confirmed in the processing conditions of ordinary drill bits. Now, with the advent of carbide drill bits, the concept of drilling has also changed. In fact, a reasonable choice of carbide drill bits can greatly improve drilling productivity and reduce the cost of processing each hole.

Carbide bit

Due to the high price of carbide drill bits, it is the responsibility of every machining worker to use it properly and make the most of it. The rational use of carbide bits mainly includes the following aspects:

1. Choose the right machine tool.

Carbide drill bits can be used on CNC machines, machining centers and other machine tools, and ensure that the tip of the tool pulsates. 0.02. However, machines such as radial drills and milling machines have low power and low spindle accuracy, which can lead to premature bit damage and should be avoided whenever possible.

2. Select the correct handle.

Tool store, side press tool holder, hydraulic tool holder, thermal expansion tool holder, etc., can be used, but because the clamping force of the quick change drill chuck is insufficient, it is easy to lead to the skid of the carbide drill bit and failure, so it should be avoided.

3. Proper cooling.

External cooling of carbide drill bits should pay attention to the combination of cooling directions to form a trapezoidal structure and minimize the Angle with the tool. Secondly, the internally cooled alloy bit should pay attention to pressure and flow, and should prevent cooling.