Down Hole Hammer Drill Bit

 

 

A Down Hole Hammer Drill Bit, also known as a DTH (Down-the-Hole) hammer drill bit, is an essential component of the DTH drilling system. It's the part of the drilling tool that directly contacts and penetrates the rock or geological formation during drilling operations. DTH hammer drill bits are designed to endure the high impact and wear associated with percussive drilling.

 

 

With the rapid development of socialist modernization, the use of large bore drilling is becoming more and more extensive, such as the construction of special water conservancy and hydropower projects, pile foundation, machine and well engineering, national defense construction, mines and oil mining, and so on. The tooth insert bit realizes the low broken rock layer through a pneumatic or hydraulic impactor and adopts the way of positive circulation or reverse circulation slag discharge, which is widely recognized by the market because of its high efficiency and low cost.

 

The diameter of a large-diameter Down Hole Hammer Drill Bit is generally more than 300 mm, more of which is 500,800,1000 mm, or even more than 1500-3000. The depth of the large-diameter drilling is different depending on the application, and there is a great difference in the rock formation, and most of the requirements are very strict. The large-diameter Down Hole Hammer Drill Bit is very expensive, so it can prevent early failure, and the service life of the drill bit is the primary quality control target for the production of the Down Hole Hammer Drill Bit, and the material selection and heat treatment process are especially important. In this paper, the properties of steel for different heat treatments are compared, and the difference of the microstructure after different heat treatments is used, and the optimal material selection and heat treatment process are finally determined.

 

1. The material performance of deep hole large diameter Down Hole Hammer Drill Bit requires, that the poor working environment puts forward very high requirements for hardness, strength, toughness, impact resistance, wear resistance and fatigue resistance of drill head body. Considering the performance requirements of each part, it can be considered that the selection of drill head body material should meet the following requirements:

 

1. The surface hardness is required to enhance the wear resistance and the core toughness is better to enhance the impact resistance. In order to avoid brittle fracture and fatigue fracture, the material should have good fracture toughness, fatigue strength and fracture strength.

 

2. with high hardenability. In order to meet the different requirements of the performance of each part of the bit body, it is beneficial to improve the indicating yield strength, improve the fastening force of the tooth hole to the alloy tooth, and also improve the yield strength and toughness of the center part.

 

3. In the encounter of downhole Yanze gas-liquid can have a certain corrosion resistance.

 

4. The structure and hardness of the material are high at a certain high temperature, and the deformation and the like are not easy to be softened and the like. Good process properties, such as good forging properties, heat treatment properties and so on.

 

5. The metallurgical quality is high, the microstructure uniformity is good, the purity is high.

 

DHD Shank: DHD (Down-the-Hole) shank is a widely used bit shank configuration. It is compatible with DHD series DTH hammers and is commonly used for drilling in various rock formations.

 

SD Shank: SD (Sandvik) shank is another popular bit shank configuration. It is compatible with Sandvik's DTH hammer systems and is often used in mining and construction applications.

 

QL Shank: QL (QLite) shank is commonly associated with Atlas Copco's DTH hammer systems. It is used for drilling in a wide range of geological conditions and is known for its durability.

 

Mission Shank: Mission shank bits are designed for use with Mission series DTH hammers. They are widely used in construction and quarrying applications.

 

Numa Shank: Numa shank bits are used with Numa DTH hammers. These bits are known for their versatility and can handle various drilling conditions.

 

BR Shank: BR (Breakout) shank bits are used with breakout-type DTH hammers. These bits are suitable for drilling in hard rock formations.

CIR Shank: CIR (Concentric Impactor) shank bits are used with CIR-type DTH hammers, which are often used in water well drilling and geotechnical applications.

 

Mach44 Shank: Mach44 shank bits are designed for use with the Mach44 series DTH hammers. They are known for their high penetration rates.

 

 

Drill Bits	Diameter		Gauge Buttons (mm)	Front Buttons(mm)				Weight(KG)	Part Number
	mm	Inch		Flat Face	Convex Face	Concave Face	Face Type
	140	5 1/2	Φ18*7	Φ14*3	Φ15*4	/	Convex Face	13.7	LR-M50-140CV
	140	5 1/2	Φ16*8	Φ14*8	/	/	Flat Face	13.9	LR-M50-140FF
	146	5 3/4	Φ18*8	Φ15*8	/	/	Flat Face	14.5	LR-M50-146FF
	146	5 3/4	Φ18*8	Φ15*4	/	Φ14*3	Concave Face	14.4	LR-M50-146CC
	152	6	Φ18*8	Φ15*8	/	/	Flat Face	15.0	LR-M50-152FF
	152	6	Φ18*8	Φ16*4	/	Φ14*4	Concave Face	14.8	LR-M50-152CC