Manufacturing process and selection techniques of diamond thin-walled drill bits

Introduction to the manufacturing process of diamond thin-walled drill bits

 

1 raw material preparation

• Diamond: Choose diamonds with appropriate particle size, crystal structure, and strength according to the requirements of the drill bit.
• Tire body material: Metal powders such as iron, copper, tin, cobalt, nickel, and their alloy powders are usually selected as the main components of the tire body. Nowadays, a small amount of non-metallic materials are also added to obtain special properties.
• Matrix: Select seamless steel pipes or other steel materials of appropriate specifications and process them into the matrix structure of the drill bit, ensuring dimensional accuracy and surface quality, especially dynamic balance.

 

2 Mixing diamond with matrix material

• Mix the selected diamond and metal powder evenly in a certain proportion. In order to improve the adhesion between diamond and the matrix, surface treatments such as metal plating and etching are sometimes applied to diamond particles.

 

3 pressing

• Place the mixed powder into a mold and press it under a certain pressure to preliminarily shape the powder into a compact with a certain density and strength. During the pressing process, it is necessary to control parameters such as pressure and holding time to ensure the quality of the billet.

 

4 sinter

• Place the pressed billet into a high-temperature furnace for sintering. During the sintering process, metal powder melts at high temperatures and combines with diamond particles to form drill teeth with high hardness and wear resistance. The sintering temperature, insulation time and other parameters are precisely controlled according to the composition and performance requirements of the matrix material.

 

5 welding

• Welding: Welded diamond thin-walled drill bits require the sintered drill teeth to be welded to the substrate. Usually, high-frequency brazing and laser welding processes are used.
• Electroplating and vacuum brazing are used for some diamond thin-walled drill bits, and in recent years, vacuum brazing technology has also become quite popular.

 

6 Post processing

• In order to facilitate identification, transportation, and rust prevention, it is necessary to treat the appearance of the drill bit accordingly.

 

Selection techniques for diamond thin-walled drill bits:

• If there are no strict requirements for aperture, choose the diameter one size larger.
• Use a high-speed drilling rig for small-sized drill bits, and a low-speed drilling rig for large-sized drill bits. Adjust the speed control drilling rig accordingly.
• There are different types of drill bits corresponding to glass, stone, brick walls, reinforced concrete, etc., and their mutual substitutability is not strong. If the reinforced concrete drill bit cannot hit the glass, pay attention to the product manual.
• It is generally not necessary to use a drill bit that is too long when drilling deep holes. If it is possible to take cores in sections, connecting an extension rod is an option.
• In terms of length selection, thick can choose long, thin should choose short, and the aspect ratio is generally below 10:1.