Cross Drill Bit
2.It has extremely strong resistance to radial abrasion, is not sensitive to whether the rock is homogeneous or has fractures, and performs stably in complex rock formations.
3.Suitable for medium-hard to hard rocks (Protodyakonov's hardness coefficient f≥8), especially suitable for hard, highly abrasive, and fissure-developed rock formations.
4.Tapered connection or threaded connection, used in conjunction with tapered drill rods or threaded drill rods.
Product introduction
Cross Drill Bit is a core tool specifically designed for mine excavation and rock drilling. It is used in conjunction with conical drill rods or threaded drill rods through its conical hole or thread at the tail end. It is a rock drilling tool with four hard alloy blades embedded and welded on the top in a cross arrangement.
Cross Drill Bit product Parameter (specification)
|
Parameter Name |
Connection method |
Unit |
Tungsten carbide bit diameter |
|
Cross-shaped |
Tapered connection |
mm |
Φ38- Φ45 |
|
Cross-shaped |
Waveform Threaded Connection R32 t=12mm |
mm |
Φ50- Φ65 |
|
Cross-shaped |
Waveform Threaded Connection R32 t=12.7mm |
mm |
Φ48- Φ64 |
Product feature and application
Structural features:
Alloy Blade: Four pieces of hard alloy are arranged in a cross shape and welded to the front end of the carbide body, forming multiple cutting edges.
Tungsten carbide tip: Made from high-quality alloy steel through precision forging, it has high strength and strong impact resistance.
Application fields:
Mining: Drilling and blasting holes in metal mines (such as iron ore, copper ore) and non-metallic mines (such as limestone, granite).
Infrastructure Engineering: Excavation for railways, highways, and subway tunnels, as well as basic construction and rock anchoring for water conservancy projects such as dams and reservoirs.
Quarrying and Geological Exploration: Used for rock fragmentation in quarries and sampling of hard rock formations in geological drilling.
Production details
Powder Discharge Structure: The powder discharge holes are arranged at the center or side of the head body, connected to the rock drill's compressed air system. High-pressure airflow is used to discharge rock powder out of the hole, preventing drill jamming.
Mechanical Advantages of a Cross-shaped Layout: Four alloy teeth are evenly distributed, which can evenly disperse the impact force transmitted by the rock drill to multiple contact points. This design not only reduces the load on individual cutting edges, making them more durable when working in hard rock, but also better balances circumferential forces during drilling, effectively reducing钎头 (drill bit) deviation and ensuring the straightness of the borehole. It is particularly suitable for operation in rock formations with developed fractures or uneven hardness.
Why choose us
1.Outstanding durability
It has extremely strong radial abrasion resistance. The four-flute design evenly distributes impact force, reducing the load on individual cutting edges and thus extending service life.
2.Broad adaptability
It is not sensitive to whether the rock is homogeneous or has fractures, maintains stable performance under complex and variable geological conditions, and has a wide range of applications.
3.Higher stability
The cross-shaped structure can better balance the forces during drilling, effectively reduce the deviation of the drill bit, and help ensure the straightness of the borehole.
FAQ
Q: In what situations should a cross drill bit be preferred over a flathead or ball-tipped drill bit?
A: 1.Complex and fragmented rock formations: When rock has developed fractures and uneven hardness, the four-blade design of the cross-shaped drill bit can better balance the force, is less likely to get stuck, and has significantly higher drilling stability compared to the single-blade drill bit.
2.High-abrasive rocks: Their structure provides excellent resistance to radial abrasion, resulting in a longer service life in highly abrasive rocks.
3.Pursuing Comprehensive Stability: Compared to some tungsten carbide buttons, cross-shaped bits have a wider range of adaptability and are less sensitive to rock conditions, making them a more reliable choice in unknown or complex geological conditions.
Q: What are the essential operational points to note when using it?
A: 1.Drilling Tips: When starting to drill, the impact energy of the rock drill should be set low. Once the drill bit has smoothly penetrated the rock, gradually increase it to the normal parameters. This can prevent the alloy teeth from chipping due to excessively high local stress.
2.Abnormal Handling: If encountering abnormally hard foreign objects (such as steel bars) or a sudden increase in resistance during drilling, stop the operation immediately for inspection. Forcing through would cause severe damage to the drill bit.
3.Maintain smooth powder discharge: Ensure sufficient air pressure or water pressure for powder discharge. Inadequate powder discharge will cause rock powder to be repeatedly ground against the drill bit, leading to excessive wear and drill jamming.
Q: How to determine if a cross drill bit needs resharpening or replacement?
A: 1.When the platform width of the alloy tooth edge wear reaches a certain limit (for example, about 3 millimeters), it must be removed in time for sharpening. Continuing to use it will sharply reduce the rock drilling speed and increase energy consumption.
2.If the bit shows obvious conical wear (i.e., the head diameter is smaller than the root), or if the alloy teeth are chipped, broken, or severely fragmented, the cutting structure is damaged, the bit body is swollen and cracked, or the bit steel body is damaged, it should be replaced immediately and not reground for further use.
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