Fiberboard classification
Fibreboard is generally divided into two categories, non-compressed and compressed, according to product density. The non-compressed product is a soft fiberboard with a density of less than 0.4 g/cm3; the compressed product has a medium density fiberboard (or semi-hardboard, density 0.4-0.8 g/cm3) and a hardboard (density greater than 0.8 g). /cm3). According to the slab forming process, it can be classified into a wet fiberboard, a dry fiberboard, and an oriented fiberboard. According to different post-processing methods, it can be divided into ordinary fiberboard and oil-treated fiberboard. The soft fiber board is light in weight, has a large void ratio, has good heat insulation and sound absorption, and is used as a covering material inside a public building. Specially treated to obtain a light fiberboard with more pores, which has adsorption properties and can be used for purifying air.
The medium density fiberboard has a uniform structure, moderate density and strength, and good reworkability. The product has a wide range of thicknesses and has a variety of uses, such as furniture materials, housing materials for televisions, and the like. Hardboard products range in thickness from 3 to 8 mm. The high strength, 3 to 4 mm thick hard fiberboard can be used instead of 9 to 12 mm sawn timber. Used in buildings, ships, vehicles, etc.
General Introduction
Bit Face Shape Selection:
1. Drop Center Bit
For high penetration rates in soft to medium hard and fissured rock formations. Low to medium air pressures. Maximum hole deviation control.
2. Concave Face
The all-around application bit face specifically for medium hard and homogeneous rock formations.
Good hole deviation control and good flushing capacity.
3. Convex Face
For high penetration rates in soft to medium-hard with low to medium air pressures. It is the most resistance to steel wash, and may reduce theload and wear on the gauge buttons, but poor hole deviation control.
4. Flat Face Bit
This kind of face shape is suitable for hard to very hard and abrasive rock formations in applications with high air pressures. Good penetration rates an resistance to steel wash.
Carbide Button Shape Selection:
1. Semi-Ballistic Buttons
2. Ballistic Button
3. Spherical Button
4. Two-step Button
Raw Material
Steel:
First class special alloy steel with high strength, heat resistance and wearable
Carbide
The best tungsten carbides from China are commonly applied.
Tungsten carbide from European is also available.
DTH Hammer Bit
DTH Hammer Bit,DTH Hammer Drill Bit,DTH Hammers Bits for Mining,Mission Series DTH Hammer Bits
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