Four factors affecting the performance of alloy drill bits

1. Carcass performance

Carcass performance is an important indicator to measure the performance of the drill bit. The carcass should have certain strength, wear resistance and impact toughness. It can be firmly drilled with needle-shaped alloys and should have a certain adaptability to the drilled formation, such as drilling into strong abrasive stones. The hardness and wear resistance of the body should be improved. On the contrary, the soft matrix should be used to drill into the rock with weak abrasiveness. There are many factors that affect the performance of the carcass, such as the composition ratio of the iron and copper alloys that make up the carcass, sintering temperature, pressing pressure, etc.

2. Drill lips

The shape and size of the lip surface of the drill bit have a certain impact on the drilling efficiency. The flat lip surface is easy to be damaged when drilling. The resistance is large when drilling. The rounded lip shoulder should be used to facilitate breakdown, powder discharge and cooling. The center of the lip surface should be increased appropriately The number of alloys when placing the inner and outer alloys, leave them 1 rrm away from the lip surface. The shoulders are conducive to self-grinding into a round surface. The lip area of the drill bit is generally 30% of the drill bit annular area. % C#0% of the lip area is more abrasive to the down layer. 40% fb0% of the lip area should be used to improve the life of the bit

3. The distribution and quantity of needle alloys on the drill bit

The alloy on each tire block should be able to close the bottom of the hole to prevent grooving on the lip surface of the drill bit. The total number of tire blocks per scoring ring on the lip surface of the drill bit (diameter 59-110mm drill bit) is generally 4). There should be a certain amount of alloy alloy on the lip surface of the Dike stone drill bit. The cutting area is generally 12%-22% of the lip area of the drill bit. A strong abrasive layer is used. 18% 2% upper limit abrasive layer is used. Use 12% -15% lower limit

4. Reinforce the inner and outer diameter of the drill bit

In order to ensure the uniform diameter of the drill hole and prevent the drill bit's inner and outer diameter from being worn out quickly and scrapped, 3 4 pieces of 5mm x 5mm x 10mm cemented carbide blocks can be evenly welded between the inner and outer carcasses of the drill bit. The cast tungsten carbide particles (coarse grain size 0.8 1.5rrm) are evenly laid on the inner and outer sides. Good wear resistance and trimming the shoulders of the holes are beneficial to maintain uniform apertures and improve drilling efficiency.