![]() High Speed Steel (HSS) is the most popular material for drill bits particularly for its ability to withstand high temperatures while maintaining its structural integrity during drilling at these high speeds. ![]() This below guide will help you understand the different type of materials and coatings typically used and what they are best suited for. In the diameter range from 26.00 to 40.00 mm, the inserts can also be reground.Modern Drills come in a number of different Styles, Materials and Coatings to best suit different applications and provide solutions at every budget. The indexable inserts can be used in the standard holders 1xD, 1.5xD, 3xD, 5xD, 7xD and 10xD. This means that the HT 800 achieves holes of the same quality as a solid carbide drill with an optimised flute profile. The cutting material, geometry and surface of the interchangeable inserts are perfectly matched to the respective area of application. There is no need to change tools or reconfigure the machine afterwards. The modular system makes it easy to change inserts directly in the machine. The innovative clamping principle achieves the highest process reliability for holes up to 10 x D. Thanks to the pin and fitting hole, the interchangeable insert has minimal play and sits firmly in the carrier. The HT 800 consists of a wear-resistant steel beam, the replaceable cutting body and a locking screw with clamping principle. These carbide special drilling tools are based on the HT 800 WP tool system. The concave-shaped cutting edge ensures optimal chip breakage of long-chipping steels. Their stable cutting wedge ensures high wear resistance without increasing the process forces. Gühring has also expanded its range of indexable inserts for machining C-steels. ![]() The high point angle in the outer area of the indexable inserts guarantees minimised burr formation. ![]() The point geometry of these indexable inserts ensures optimum centring properties and thus compensates for the unstable machining conditions. Gühring offers interchangeable inserts that are specially designed for processing steel beams. This places particularly high demands on the drilling tools. The clamping conditions on these machines are usually unstable. Steel beams are usually prepared for assembly on special drilling/sawing machines. This grinding is used for thin-walled workpieces, sheets and soft materials. This geometry offers excellent centring properties and an accurate bore with low burr formation. With form E, a so-called centring point is ground. This grinding is mainly used in metal processing for grey cast iron, malleable iron and forgings. This makes the tool less sensitive to shocks and increases its tool life. It removes the cutting corner, creating two new, less sharp cutting corners. Form D is a combination of form A and an additional point angle, which is usually 90°. This means that the split point grinding can be used to create more precise hole diameters and a perfect round hole. This ensures excellent centring properties and lower feed forces. In this type of grinding, two surfaces are ground to each other so that they cross in the area of the transverse cutting edge. Chip packages form on the corrected surface, which are broken and transported away via the flutes.įorm C corresponds to split point grinding. This increases resistance to chips when drilling into solid material. The positive rake angle is corrected and the cutting wedge is ground “blunt”. It is a combination of form A and a main cutting edge correction. This means that the transverse cutting edge is reduced at defined angles in additional operation with a grinding disc.įorm B is suitable for long-chipping materials such as structural steel and high-strength steel. With form A, the transverse cutting edge is sharpened to reduce the axial forces. The enormous range of materials to be machined requires a wide variety of point grinds.
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