1. Three types of drill bits are recommended, one is cobalt-containing high-speed steel drill bits, and the other is high-performance cemented carbide drill bits. Cobalt-containing high-speed steel drill bits are cheap, but have short life span, low efficiency, and poor precision. The centering drill has better effect; the special drill bit for hard alloy stainless steel is expensive, but the service life is good, the efficiency is much higher, the dimensional accuracy of the hole is also high, and the smoothness is also much higher. It does not need a centering drill to process, and can be drilled directly ; The alloy cobalt drill bit is better for comparison between the two. The stainless steel is characterized by high toughness and easy sticking to the knife.Therefore, the hardness of the drill bit is required to be high. The main components of the cemented carbide are tungsten carbide, cobalt, etc. The hardness is generally higher than HRC 90 degrees, and the cutting fluid adopts a thick emulsion. The cutting speed is as low as possible, because 304 stainless steel is easy to drill and heat, which can reduce the temperature and facilitate chip removal.

rock drill bits

2.The drill bits for high-cobalt high-speed steel processing stainless steel are: high-cobalt drill bits (m35 drill bits, m42 drill bits). Among them, the m42 bit has the best cost performance.

Violent drill fast drill

3. Alloy drill bit generally refers to hard alloy drill bit, divided into integral type, welding type, indexable blade type and replaceable head type.Alloy drill bits are generally made of tungsten steel, and there is a big difference between imported and domestic alloy drill bits..Imported alloy drill bits generally use VHM micro-grain cemented carbide (ISO K40), ultra-fine particle type (0.6¦Ìm), the surface of high-quality alloy drill bits will be treated with coatings, such as aluminum chromium nitride (AlCrN) coating, which is a single-layer coating with a thickness of 4¦Ìm and a microhardness of 3200HV, 0.35 friction coefficient, thermal stability up to 1100 degrees Celsius.The color of the drill bit after coating is blue-gray.The coated alloy drill bit can process low alloy steel and high strength steel.High-hard steel can reach 54HRC.

Quick drill

4.Compared with the integral drill, the U drill is a tool that uses a combination of a center blade (inner blade) and a peripheral blade (outer blade) for hole processing..This structure determines that the U drill has an irreplaceable advantage over other drilling tools.

1Multi-specification versatility

U drill blades are suitable for various materialswholesale drill bits4 types of chip breakers for chips, 4 types of materials suitable for processing of different materials, plus 2D-5D serialized diameter specifications, can be combined with hundreds of tool forms, which can meet more than 80% of the drilling processing requirements.

In addition, U drills are usually processed from the outside. Compared with the shape of the center, U drills are more suitable for processing conditions..(The following are common U drill applications)

2 High efficiency and low cost

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