Product Description

Pile Foundation Carbide Mission Serise Drilling Tools MDHM4-105 DTH Hammer Bit

Product Description 

KINGDRILLING hammer bits are used with Down-the-hole hammers for drilling holes through a wide range of rocks types. In conjunction with DTH hammers, drill hammer bits are designed with a spline drive for rotating the bit in the ground. Drill bits are available in different sizes and different styles so they can drill a wide range of hole sizes.

Rock drill bits Shank type:M3,M4,M5,M6,M8,M1,M12

DTH hammer bits hole diameter: 3”, 4”, 5”, 6”, 8”(85mm-350mm).

 

Product features: 
DTH Drill Bits are produced from premium quality nickel-alloy steel for increased durability and wear characteristics. Specific heat treatment standards and special “stress relief” processes ensure consistent performance. 

Technical Date 

3 Inch Hight Air Pressure DTH bits

Model

Bit Dia.(mm)

NO. X    Button Dia.

NO.Air    Holes(PCS)

Weight(KG)

Gauge

Front

MDHM3-85

85

6*Φ13

4*Φ12

2

4.5

MDHM3-90

90

6*Φ14

4*Φ12

2

4.7

MDHM3-95

95

6*Φ14

4*Φ13

2

4.9

MDHM3-100

100

6*Φ14

5*Φ12

2

5.0

MDHM3-105

105

6*Φ14

5*Φ13

2

5.5

4 inch high air pressure DTH bits

MDHM4-105

105

6*Φ14

5*Φ13

2

6.0

MDHM4-110

110

7*Φ14

6*Φ13

2

6.2

MDHM4-115

115

7*Φ14

6*Φ13

2

6.6

MDHM4-120

120

8*Φ14

7*Φ13

2

7.0

MDHM4-127

127

8*Φ14

7*Φ13

2

7.4

5 inch high air pressure DTH bits

MDHM5-135

135

7*Φ18

6*Φ14

2

12.5

MDHM5-140

140

7*Φ18

7*Φ14

2

13.5

MDHM5-146

146

7*Φ18

7*Φ14

2

14.0

MDHM5-152

152

8*Φ18

8*Φ14

2

14.4

MDHM5-165

165

8*Φ18

8*Φ16

2

15.0

6 inch high air pressure DTH bits

MDHM6-152

152

8*Φ18

7*Φ16

2

22.0

MDHM6-165

165

8*Φ18

8*Φ16

2

23.0

MDHM6-171

171

8*Φ18

8*Φ16

2

24.0

MDHM6-190

190

9*Φ18

9*Φ16

3

25.0

MDHM6-203

203

9*Φ18

11*Φ16

3

28.0

8 inch high air pressure DTH bits

MDHM8-305

305

12*Φ18

29*Φ16

4

95.0

MDHM8-203

203

10*Φ18

10*Φ16

2

35.0

MDHM8-216

216

10*Φ18

12*Φ16

2

40.0

MDHM8-241

241

12*Φ18

18*Φ16

2

54.0

MDHM8-254

254

12*Φ18

21*Φ16

3

57.0

MDHM8-305

305

12*Φ18

29*Φ16

4

77.0

10 inch high air pressure DTH bits

MDHM10-254

254

12*Φ18

20*Φ16

3

90.0

MDHM10-305

305

12*Φ18

36*Φ16

4

102.0

MDHM10-311

311

12*Φ18

36*Φ16

4

104.0

MDHM10-318

318

12*Φ18

38*Φ16

4

106.0

MDHM10-330

330

14*Φ18

42*Φ16

4

112.0

12 inch high air pressure DTH bits

MDHM12-305

305

12*Φ18

36*Φ16

4

152.0

MDHM12-311

311

12*Φ18

36*Φ16

4

158.0

MDHM12-330

330

16*Φ18

42*Φ16

4

165.0

MDHM12-356

356

16*Φ19

48*Φ16

4

178.0

MDHM12-381

381

16*Φ19

48*Φ18

4

195.0

MDHM125-305

305

12*Φ18

36*Φ16

4

170.0

MDHM125-311

311

12*Φ18

36*Φ16

4

173.0

MDHM125-330

330

16*Φ18

42*Φ16

4

182.0

MDHM125-356

356

16*Φ19

48*Φ16

4

191.0

MDHM125-381

381

16*Φ19

48*Φ18

4

200.0

We can design and manufacture the different diameter,holes number,carbide button shape and face shape according to the customers’ requirement.
Order Xihu (West Lake) Dis.: Shank + Head Diameter + Face Design + Button Shape

How to choose the suitable head face of the DTH drill bit?

1. Concave:

Suitable for all kinds of formation, especially for deep well drilling, perpendicularity of the hole is wonderful.

2. Convex: 

Suitable for the formation of moderate hardness stratum, drilling efficiency is good, borehole perpendicularity is moderate.

3. Flat:        

Suitable for special hard formation stratum, especially for fracture, crack spacing and complex formation drilling effect is very good, has the good perpendicularity of the borehole.

Carbide Drill Bit Advantages as below:

1. High quality steels materials. Steel is from CZPT and Tungsten carbide are YK05, or T6 from Element Six in Germany

2. Kingdrilling DTH tools are forged by advanced electron-hydraulic forging hammer.

3. Advanced heat-treatment equipment: multipurpose CZPT heat treatment.

4. Completed moulding (tooling ) departments with many molds available.

5. Professional R&D team,completed quality system.

6. Strict Quality-Check Systems.

The information you may like to know before order:
1. Methods of Payment:
T/T (Telegraphic Transfer) or Western Union or L/C at sight
2. Handling time for an order
Based on order quantity, normally it takes 25 days for production.
Only 3 or 5 days if we have stock on your request size.
3. Shipping way
Sample order: We suggest Courier express like DHL/UPS/TNT/FEDEX or by air
Bulk order: We suggest by air or by sea.
4. Quality Control
We have our own experienced QC.
There will be strict inspection and testing for each order before shipping out.
5. After Services:
1. Our sales team will response for your question within 24 hours (Holidays Excluded)
2. Technical Support will be available in any time

About our Company 
Kingdrilling Machinery Co. , Ltd is established in 2005 years. Located in HangZhou East Lake High-tech Development Zone, is 1 of the most important manufacturers specialized in researching and producing Casing drilling system, DTH hammer, DTH bit, thread DTH bits, taper DTH bits, coupling sleeve, Anchor, Shank adapter, coal picks and so on.

Relying on the university resources and talent advantages in Optical Valley region, combining with multiple laboratories in universities, we focused on developing the newest products system.

Product Application:

Transport:

Package and Delivery:
Packed by Carton or Wooden cases.

Delivery:

  1. Goods in stock can be delivered within 5 days.
  2. DTH Bits production time is about 15 days.
  3. DTH Hammer product time is about 30 days.

More products:

 

The Benefits of Spline Couplings for Disc Brake Mounting Interfaces

Spline couplings are commonly used for securing disc brake mounting interfaces. Spline couplings are often used in high-performance vehicles, aeronautics, and many other applications. However, the mechanical benefits of splines are not immediately obvious. Listed below are the benefits of spline couplings. We’ll discuss what these advantages mean for you. Read on to discover how these couplings work.

Disc brake mounting interfaces are splined

There are 2 common disc brake mounting interfaces – splined and six-bolt. Splined rotors fit on splined hubs; six-bolt rotors will need an adapter to fit on six-bolt hubs. The six-bolt method is easier to maintain and may be preferred by many cyclists. If you’re thinking of installing a disc brake system, it is important to know how to choose the right splined and center lock interfaces.
splineshaft

Aerospace applications

The splines used for spline coupling in aircraft are highly complex. While some previous researches have addressed the design of splines, few publications have tackled the problem of misaligned spline coupling. Nevertheless, the accurate results we obtained were obtained using dedicated simulation tools, which are not commercially available. Nevertheless, such tools can provide a useful reference for our approach. It would be beneficial if designers could use simple tools for evaluating contact pressure peaks. Our analytical approach makes it possible to find answers to such questions.
The design of a spline coupling for aerospace applications must be accurate to minimize weight and prevent failure mechanisms. In addition to weight reduction, it is necessary to minimize fretting fatigue. The pressure distribution on the spline coupling teeth is a significant factor in determining its fretting fatigue. Therefore, we use analytical and experimental methods to examine the contact pressure distribution in the axial direction of spline couplings.
The teeth of a spline coupling can be categorized by the type of engagement they provide. This study investigates the position of resultant contact forces in the teeth of a spline coupling when applied to pitch diameter. Using FEM models, numerical results are generated for nominal and parallel offset misalignments. The axial tooth profile determines the behavior of the coupling component and its ability to resist wear. Angular misalignment is also a concern, causing misalignment.
In order to assess wear damage of a spline coupling, we must take into consideration the impact of fretting on the components. This wear is caused by relative motion between the teeth that engage them. The misalignment may be caused by vibrations, cyclical tooth deflection, or angular misalignment. The result of this analysis may help designers improve their spline coupling designs and develop improved performance.
CZPT polyimide, an abrasion-resistant polymer, is a popular choice for high-temperature spline couplings. This material reduces friction and wear, provides a low friction surface, and has a low wear rate. Furthermore, it offers up to 50 times the life of metal on metal spline connections. For these reasons, it is important to choose the right material for your spline coupling.
splineshaft

High-performance vehicles

A spline coupler is a device used to connect splined shafts. A typical spline coupler resembles a short pipe with splines on either end. There are 2 basic types of spline coupling: single and dual spline. One type attaches to a drive shaft, while the other attaches to the gearbox. While spline couplings are typically used in racing, they’re also used for performance problems.
The key challenge in spline couplings is to determine the optimal dimension of spline joints. This is difficult because no commercial codes allow the simulation of misaligned joints, which can destroy components. This article presents analytical approaches to estimating contact pressures in spline connections. The results are comparable with numerical approaches but require special codes to accurately model the coupling operation. This research highlights several important issues and aims to make the application of spline couplings in high-performance vehicles easier.
The stiffness of spline assemblies can be calculated using tooth-like structures. Such splines can be incorporated into the spline joint to produce global stiffness for torsional vibration analysis. Bearing reactions are calculated for a certain level of misalignment. This information can be used to design bearing dimensions and correct misalignment. There are 3 types of spline couplings.
Major diameter fit splines are made with tightly controlled outside diameters. This close fit provides concentricity transfer from the male to the female spline. The teeth of the male spline usually have chamfered tips and clearance with fillet radii. These splines are often manufactured from billet steel or aluminum. These materials are renowned for their strength and uniform grain created by the forging process. ANSI and DIN design manuals define classes of fit.
splineshaft

Disc brake mounting interfaces

A spline coupling for disc brake mounting interfaces is a type of hub-to-brake-disc mount. It is a highly durable coupling mechanism that reduces heat transfer from the disc to the axle hub. The mounting arrangement also isolates the axle hub from direct contact with the disc. It is also designed to minimize the amount of vehicle downtime and maintenance required to maintain proper alignment.
Disc brakes typically have substantial metal-to-metal contact with axle hub splines. The discs are held in place on the hub by intermediate inserts. This metal-to-metal contact also aids in the transfer of brake heat from the brake disc to the axle hub. Spline coupling for disc brake mounting interfaces comprises a mounting ring that is either a threaded or non-threaded spline.
During drag brake experiments, perforated friction blocks filled with various additive materials are introduced. The materials included include Cu-based powder metallurgy material, a composite material, and a Mn-Cu damping alloy. The filling material affects the braking interface’s wear behavior and friction-induced vibration characteristics. Different filling materials produce different types of wear debris and have different wear evolutions. They also differ in their surface morphology.
Disc brake couplings are usually made of 2 different types. The plain and HD versions are interchangeable. The plain version is the simplest to install, while the HD version has multiple components. The two-piece couplings are often installed at the same time, but with different mounting interfaces. You should make sure to purchase the appropriate coupling for your vehicle. These interfaces are a vital component of your vehicle and must be installed correctly for proper operation.
Disc brakes use disc-to-hub elements that help locate the forces and displace them to the rim. These elements are typically made of stainless steel, which increases the cost of manufacturing the disc brake mounting interface. Despite their benefits, however, the high braking force loads they endure are hard on the materials. Moreover, excessive heat transferred to the intermediate elements can adversely affect the fatigue life and long-term strength of the brake system.

China high quality Pile Foundation Carbide Mission Serise Drilling Tools Mdhm4-105 DTH Hammer Bit     with Best SalesChina high quality Pile Foundation Carbide Mission Serise Drilling Tools Mdhm4-105 DTH Hammer Bit     with Best Sales