Sharpened carbide has a cutting edge angle (or can be ground into a cutting edge angle). The cross section of the cutting edge angle gradually increases during drilling. Its geometric shape is:
(1) Thin-shaped alloy: There are three types of rectangular flakes, rhombus flakes and rectangular flakes. The commonly used types are T0, T4, S3 and S5. The thickness is generally less than 3-6mm, and it is easy to cut into rocks, but has poor strength and wear resistance. It is mostly used for drilling in grade 1-4 soft rocks or homogeneous rocks. Among them, type S3 is mostly used for scraper bits, and type S5 is mostly used for scraper bits for oil well drilling.
(2) Column-shaped alloy: There are three types: octagonal column (T1 type), square column (T3 type) and conical columnar (T5 type). When drilling, the contact surface between the columnar alloy and the rock is large, and its strength and durability are They are relatively abrasive, so they are mostly used in grade 4-7 medium-hard rock formations. Among them, T1 alloy can be used in harder rock formations, and T5 alloy is used in hydraulic impact rotary drilling. In general, octagonal column alloys have the advantages of being easier to break rocks, easier to remove rock powder, stronger in wear resistance, and easier to weld than square column alloys. The octagonal prism alloy has an advanced front edge, which has low resistance when cutting into the rock, has a grooving effect, and can discharge rock powder along both sides of the cutting tool to reduce wear; it also has a nearly arc-shaped cutting edge, which can make the wear uniform, that is to say, After wear, it returns to a curved surface and can still maintain its cutting ability. In addition, the octagonal column alloy adopts the round eye welding method, which is strong and reliable. If the square column alloy adopts the round eye welding method, the gaps will be too large, and the groove welding method will easily collapse during drilling.
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