Twist: Twist is the most widely-processing tool. Typically diameter range of 0.25 to 80 mm. It is mainly composed of the working portion and a shank portion. Work section has two spiral grooves, the shape of twist, hence the name. In order to reduce the guide portion of the hole when drilling intramural friction, twist since the direction of the drill tip to gradually reduce the diameter of the shank inverted cone. Twist the helix angle of the cutting edge mainly affects the size of the front corner, edge flap strength and chip performance, usually 25 ° ~ 32 °. Spiral groove available milling, grinding, hot rolling or hot extrusion methods such as processing, after the cutting portion is formed by the front end of the drill bit sharpening. Standard twist angle of the cutting portion 118, the chisel edge angle is 40 ° ~ 60 °, the clearance angle of 8 ° ~ 20 °. For structural reasons, the rake angle at the outer edge of the large decreases toward the middle, chisel at a negative rake angle (up to about -55 °), from the squeezing action when drilling. In order to improve the cutting twist, can be processed in accordance with the nature of the material will be ground into various shapes cutting part repair (such as drilling group). Shank twist drill with and handle the form of two straight shank taper, when caught in the drill chuck machining the former, the latter is inserted in the machine spindle or tailstock taper in. General manufacturing high-speed steel twist. Inserts welded carbide blade or crown of twist suitable for machining cast iron, hardened steel and non-metallic materials, solid carbide twist drills for machining small parts and printed circuit boards and other instruments.

Flat drill: flat diamond cutting part spade, simple structure, low cost, easy cutting fluid inlet ports, but cutting and chip performance is poor. Flat drill monolithic structure and assembly of two. Integral mainly for drilling diameter of 0.03 to 0.5 mm pores. Fabricated flat diamond blade can be changed, can be used to cool inside, mainly used for drilling large diameter holes 25 to 500 mm.

Deep Hole Drilling: deep hole drilling deep holes usually refers to the processing and the aperture ratio of greater than 6 hole cutter. Commonly used gun drilling, BTA deep hole drilling, injection drilling, DF deep hole drilling. Core drill also commonly used in deep processing.

Reamer: reamer 3 to 4 teeth, its rigidity than twist, to expand the existing hole and improve the precision and smoothness.

Countersink drill: countersink drill has more teeth to the hole forming method processed into the desired shape of the end for the processing of various countersunk head screws spigot, or flattened outer end of the hole.

Center Diamond: center drill for drilling shaft center hole with a piece, which is essentially a small twist by the helix angle and countersink drill composite, it is also called composite center drill.

Hollow drill: drill bit in the middle is hollow, the main material used to drill coring.

Tools Co., Ltd. Changzhou good to supply a variety of drills. Taps, milling cutters, reamers and other products for more product details, please call us, oh!

Changzhou too good tool Carbide Tool Co., Ltd. is specialized in (cutter, drill, non-standard tool) design, development, production and marketing enterprises. Our company's products are widely used in various areas of the factory machining, auto parts, aerospace, wind power transmission, such as mold. Companies with strong technology, advanced equipment, rich experience in the cutting tool industry has accumulated a good reputation, now has a number of important domestic and foreign customers, such as Volkswagen, Bosch Automotive, Shanghai General Motors, Shanghai Electric.