A drill specifically designed to machine deep holes. A hole having a hole depth to hole ratio greater than 6 is usually referred to as a deep hole in machining. When the CNC hole deep drilling machine is cut, heat dissipation and chip evacuation are difficult, and the drill pipe is slender and has poor rigidity, which is liable to cause bending and vibration. Cooling and chip removal problems are generally addressed by means of a pressure cooling system.
The deep hole drill is divided into two types: outer chip removal and inner chip removal according to the chip removal method. There are gun drills, deep hole flat drills and deep hole twist drills for external chip removal; the internal chip removal is divided into three types: BTA deep hole drill, jet drill and DF deep hole drill.
①Gun drill: There is only one cutting part, which was first used to process the barrel. During drilling, the cutting fluid enters from the middle of the drill pipe, is sprayed through the small hole in the drill head to the cutting zone, and then is discharged from the V-shaped groove of the drill bit with the chips. The gun drill is suitable for processing deep holes with a hole diameter of 2 to 20 mm and a hole depth to hole ratio greater than 100.
②BTA deep hole drilling: The cutting fluid is fed from the gap between the drill pipe and the hole wall, and the cutting fluid is discharged from the inner hole of the drill pipe by the pressure of the cutting fluid. BTA deep hole drill is suitable for drilling deep holes with a hole diameter of more than 6 mm and a hole depth to hole ratio of less than 100. Its production efficiency is more than 3 times higher than that of gun drill.
③Jet drill: CNC deep hole drilling machine for metal products, there are two layers of inner and outer drill pipes, most of the cutting fluid enters the cutting zone from the gap between the inner and outer drill pipes, and then enters the cutting zone together with the chips. The inner tube; another small part of the cutting fluid enters the inner tube through the crescent-shaped hole at the end of the inner tube, creating a jetting effect, forming a low pressure zone, which helps to suck the chips. Jet drills do not require a rigorous cutting fluid seal and are suitable for drilling deep holes with a diameter of more than 18 mm, a hole depth and an aperture ratio of less than 100.
④DF CNC hole deep drilling machine: This drill bit absorbs the advantages of BTA CNC deep hole drilling machine with rotationg drilling rig and jet drill. It adopts single pipe, and the chip discharge has the dual action of pushing and sucking, which improves the chip removal ability and can be drilled. Cut deep holes with a hole diameter of 8 mm or more.
Gun drills are usually made of high speed steel or hard alloy. Various types of internal chip removal deep hole drills can be constructed according to the size of the welded or mechanically clamped indexable carbide inserts. The guide block on the CNC hole deep drilling machine serves as a guide and centering to reduce the deflection of the borehole and the vibration during cutting. High precision The arrangement of the cutter teeth and the guide block of the cnc deep hole drilling machine mainly considers the balance of the radial force between the chip and the cutting. The body and the drill pipe can be joined by welding or square threads.
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