It is believed that the drilling process must be carried out at a lower feed rate and at a cutting speed, which is correct at the processing conditions using ordinary drill bits. Nowadays, with the advent of carbide bits, the concept of drilling has changed.
In fact, by correctly selecting the right carbide bit, you can greatly improve the drilling productivity and reduce the cost per hole.
Carbide drill bit is broken by rock pressure due to the impact load and its own rotation. In the drilling drilling, the drill bit subjected to high frequency impact load, and by the reverse, bending, stretching, compression and other complex stress role in the high-speed rotation of the environment subjected to rock, rock and mineral work Wear and corrosion of media.
Domestic and foreign use of the cone bit, Ultra Coarse Carbide Drilling Insert mostly for the three cone bit. This bit is characterized by: axial pressure and impact load distribution range is large and uniform, and can make full use of effective space, drilling smooth. The size and shape of the carbide teeth for the cone bit must be applied to the characteristics of the rock, requiring good abrasion resistance, high strength, and less fragmentation and breakage. The carbide teeth used in the cone bits are: spherical teeth, conical teeth, Ultra Coarse Carbide Drilling Insert wedge teeth, side wedges, and flat top teeth for rounds and claws.
In general, the drill bit drilled with extremely hard rock is mainly used spherical teeth, the pressure is 892 ~ 1339MPa, the speed is 50 ~ 80r / min; drilling hard and medium hard rock cone bit with cone teeth, drilling Pressure is 714 ~ 1071MPa, the speed of 60 ~ 100r / min; drilling soft and medium soft rock cone bit is the use of wedge teeth or wedge teeth, the pressure is 535 ~ 803MPa, speed 80 ~ 120r / min.
Carbide drill bit is divided into four types of foundation: the overall carbide drill, carbide indexable bit drill,
Welded carbide bit and replaceable carbide crown. Ultra Coarse Carbide Drilling Insert Each drill bit has a benefit that is appropriate for a particular processing premise.
The basic types of carbide bit: solid carbide drill, carbide indexable bit drill, welded carbide bit and replaceable carbide crown.
Using fine-grained cemented carbide materials,
To extend the service life, also carried out coating treatment,
Specially designed geometric blade type to make the drill bit with self-centering function,
In the drilling of most of the workpiece material with good chip control and chip removal performance
Selection of carbide bit considerations:
1. Machining accuracy, the choice of carbide drill bit, the first need to consider the dimensional accuracy of drilling requirements.
2. Processing stability
3. Ultra Coarse Carbide Drilling Insert Chip and coolant
4. Processing costs per hole