Manufacturers producing stepped drill bits and customized non-standard stepped drill bits
The helix angle of the twist drill mainly affects the size of the upper forward angle of the cutting edge, the strength of the blade and the chip removal performance, which is usually25°~32°。Spiral grooves can be processed by methods such as 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 a standard twist drill is118, the bevel angle of the blade is40°~60°,The rear corner is8°~20°。Due to structural reasons, the rake angle is large at the outer edge and gradually decreases towards the middle, and the rake angle is negative at the blade edge (up to-55° or so), which plays a squeezing role during drilling. In order to improve the cutting performance of twist drills, the cutting parts can be ground into various shapes (such as group drills) according to the nature of the material being processed.
There are two types of shank for twist drills: straight shank and tapered shank. During processing, the former is clamped in the drill chuck, and the latter is inserted in the tapered hole of the machine tool spindle or tailstock. General twist drills are made of high-speed steel. Twist drills with cemented carbide inserts or crowns are suitable for processing cast iron, hardened steel and non-metallic materials, etc. Solid carbide small twist drills are used for processing instrument parts and printed circuit boards.
Alloy stepped drill bits: Shuoshuo precision tools use ultra-fine carbide stepped drill bits, which are mainly used for processing stepped holes to complete drilling in one go and improve processing efficiency. We undertake various non-standard tools to be customized: double step drills, multiple step drills, tapered step drills, straight groove drills, step drill milling cutters, step drill reamers, milling cutters, reamers and other related CNC tool products.
Manufacturers producing stepped drill bits and customized non-standard stepped drill bits
The helix angle of the twist drill mainly affects the size of the upper forward angle of the cutting edge, the strength of the blade and the chip removal performance, which is usually25°~32°。Spiral grooves can be processed by methods such as 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 a standard twist drill is118, the bevel angle of the blade is40°~60°,The rear corner is8°~20°。Due to structural reasons, the rake angle is large at the outer edge and gradually decreases towards the middle, and the rake angle is negative at the blade edge (up to-55° or so), which plays a squeezing role during drilling. In order to improve the cutting performance of twist drills, the cutting parts can be ground into various shapes (such as group drills) according to the nature of the material being processed.
There are two types of shank for twist drills: straight shank and tapered shank. During processing, the former is clamped in the drill chuck, and the latter is inserted in the tapered hole of the machine tool spindle or tailstock. General twist drills are made of high-speed steel. Twist drills with cemented carbide inserts or crowns are suitable for processing cast iron, hardened steel and non-metallic materials, etc. Solid carbide small twist drills are used for processing instrument parts and printed circuit boards.
Alloy stepped drill bits: Shuoshuo precision tools use ultra-fine carbide stepped drill bits, which are mainly used for processing stepped holes to complete drilling in one go and improve processing efficiency. We undertake various non-standard tools to be customized: double step drills, multiple step drills, tapered step drills, straight groove drills, step drill milling cutters, step drill reamers, milling cutters, reamers and other related CNC tool products.
