Each drill bit for metal hole alloy processing costs

Each hole machining productivity or cost is the most important factor in drilling impact. To improve productivity, the carbide drill bits manufacturers are working on a variety of operations can be integrated step processing method, and developing high feed, high speed processing of the drilling tool. The newly developed replaceable carbide drill crown has excellent machining economy. Carbide crown replacement easy and high repeatability, processing workshops available drill body with a plurality of teeth crowns, to the processing of different pore sizes of holes. This modular drilling system can reduce 12 ~ 20mm diameter drill bit manufacturing costs and administrative expenses, while also saving the cost of backup tool when welding or solid carbide drills were reground needed. When considering the cost of processing each hole, should also be taken into account the total life of the core drill bit. In general, a solid carbide drill regrinding only 7 to 10 times, a welded carbide drill regrinding only 3 to 4 times, and replaceable carbide drill crown in the processing of steel material , its steel hammer drill bits body can be replaced at least 20 to 30 times the tooth crown.

Features and choice of solid carbide drills

Solid carbide drill bits is a complete carbide rods, use grinder processing. High strength, high hardness properties, fast cutting speed, wear resistance, red hardness and good, suitable for processing a variety of materials components. By cooling structure can be divided into non-cooling holes and there are two types of cooling holes. 1. Characteristics and uses (1) rigid, high strength, easy access to high precision core drill bit. (2) the material can be suitable for more complex drilling, selects a higher cutting speed. (3) effective to reduce chipping, has good wear resistance. (4) multi-layer geometry cutting tip edge, improving chip performance, maintain a smaller cutting resistance. (5) In addition to commonly used rectangular handle, the wide range of handles, suitable for a variety of drills, drilling machines equipped with. (6) compared with indexable insert drills, solid carbide hammer drill bits grinding times can be 7-10 times.

Twist drill bits

Twist is the most widely-processing tool. Typically diameter range of 0.25 to 80 mm. It mainly consists of
Bit working portion and the 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 electroplated core drill bit intramural friction, twist since the direction of the drill bits 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 bits 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 sds max drill bits. 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 drill bits group). Shank twist drill bits with and handle the form of two straight shank taper, when caught in the drill bits 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 core drill bit for machining small parts and printed circuit boards and other instruments.