Higred® tools Co., Ltd Tel: 0086-21-6231 3633 Fax:0086-21-6231 3373 E-mail: hg@higredtools.com
solid carbide drills
Drilling is the most common type of metalworking. The shank of the drill is held by the machine tool, which in turn imparts a rotary motion. This shank may be straight or tapered. The body of the drill is typically made up of two spiral grooves known as flutes, which are defined by a helix angle that is generally about 30 degree but can vary depending on the material properties of the workpiece. The point of the drill generally form a 118＜ angle and includes a 10 degree clearance angle and chisel edge .The chisel edge is flat with web thickness of approximately 0.015 x drill diameter. This edge can cause problems in hole location owing to its ability to "walk" on a surface before engaging the workpiece. In the case of brittle materials, drill point angles of less than 118 are used, while ductile materials use larger points angles and smaller clearance angles.
Usually we use HSS or HSS-E to make drills but for some materials that are not easily drilled, tungsten carbide comes. By powder metallurgy, Higred® tools Co., Ltd can provide different kinds of drills suitable for cast iron, cast steel, carbon steel, alloy steel, quenched steel (under HRC60). The properties of materials being worked decide we choose HSS drills or solid carbide drills. Below are the major solid drills we make.
| 2007 products | Solid Carbide Drills | cutting professional |