Tungsten Carbide Hollow Drill Description

Tungsten carbide hollow drill mainly composed of the refractory metal carbide WC and the binder phase Co, which is also called as coring drill, center drill, punch drill and so on. It is one type of tungsten carbide drills, except the hollow drill, there are cone bit, drill with indexable inserts and tungsten carbide acicular drill, etc. Tungsten carbide drill breaks the rocks through the impact load produced by the drilling pressure and rotation itself. In the process of rock drilling, the drill bit is subjected to high frequency impact load, and by twisting, bending, stretching, compression and other complex stress, and in the high-speed rotation of the environmental impact is subjected to rock, rock dust and wear and corrosion mineral water.

For the highly abrasive formations, autogenous tungsten carbide acicular drill can be used. Usually hard alloy drill drilling rock drillability is Ⅶ grade Ⅱ formation; tungsten carbide drill bits drilling Ⅵ Ⅷ stage rock. Tungsten carbide hollow drill mostly used for cutting, drilling, annular groove processing, which can be widely used in rail, construction, machinery, aerospace, bridges, ships and other processing areas. It has high drilling efficiency, flexible operation and can be used with other types of drills and achieve multifaceted process, and the drilling performance is remarkably better than the conventional twist drill.

Tungsten carbide hollow drill mainly includes the following grades:
1. YG3X HRA ≥91.5 cobalt tungsten titanium in the best wear resistance, but poor impact toughness, suitable for cast iron, nonferrous metals and alloys, broken fire steel, alloy steel small section of high-speed finishing;
2. YG3 HRA ≥90.5 wear resistance second only YG3X, more sensitive to shock and vibration, for cast iron, nonferrous metals and alloys continuous cutting of fine cars, semi-finishing and processing, fine threading and reaming;
3. YG6A HRA ≥91.5 case of fine-grained alloy, good wear resistance, suitable for cooled cast iron, nonferrous metals and other semi-finished alloy is also suitable for broken fire steel alloy steel semi-finishing and finishing;
4. YG6 HRA ≥90 high wear resistance, but less than YG3, shock and vibration is better than YG3X. For cast iron, nonferrous metals and alloys, non-metallic materials medium cutting speed semi-finishing and finishing;
5. YG8 HRA ≥89.5 use of high strength, impact resistance, shock resistance compared YG6 good, but lower wear resistance and allow the cutting speed. For cast iron, nonferrous metals and alloys, non-metallic materials at low cutting speed.

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