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Better Application Of Low Air Pressure Dth Hammers Professional

2 years ago Multimedia Charlotte   156 views

$ --

  • better-application-of-low-air-pressure-dth-hammers-big-0
Location: Charlotte
Price: $ --

Low Air Pressure DTH Hammers is the most widely used hole machining tool. Usually the diameter ranges from 0.25 to 80 mm. It is mainly composed of the working part of the drill bit and the shank. The working part has two spiral grooves, which resemble twists, hence the name. In order to reduce the friction between the guide part and the hole wall during drilling, the twist drill gradually decreases in diameter from the drill tip to the shank to form an inverted cone shape. The helix angle of the twist drill mainly affects the size of the rake angle on the cutting edge, the strength of the blade and the chip removal performance, usually 25°~32°. The spiral groove can be processed by milling, grinding, hot rolling or hot extrusion, and the front end of the drill bit is sharpened to form a cutting part. The top angle of the cutting part of the standard Atlas Copco Shank Adapters is 118, the chisel edge bevel angle is 40°~60°, and the relief angle is 8°~20°. Due to structural reasons, the rake angle is large at the outer edge and gradually decreases toward the middle. The chisel edge has a negative rake angle (up to about -55°), which acts as a squeeze during drilling.