coating twist drill bit for power tools
A Twist Drill can drill metal. The Twist Drill Bit can drill metal concrete, wood, ceramic tile, glass, etc. To drill holes on metals such as alloy steel, cast iron, etc., a black twist Drill Bit made of high-speed steel is required, and the speed should not be too high during use. Otherwise, it is easy to burn the edge of the drill. This drill can also be used on wood, and the speed should not be too high, because the wood will also heat up. Twist drill parameters 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, the helical groove can be processed by milling, grinding, hot rolling or hot extrusion. The front end of the drill bit is formed after sharpening. cutting part. The apex angle of the cutting part of the standard ordinary twist drill, the bevel angle of the Chisel edge is the clearance angle. Due to structural reasons, the rake angle gradually decreases from the outer edge to the middle, and the chisel edge is negative. The rake angle can be left and right. extrusion. In order to improve the cutting performance of the twist drill, the cutting part can be ground into various shapes according to the properties of the material to be processed.
