High speed drilling

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Under High Speed Drilling (HSD) (high-speed drilling and graters) means a drilling with an increased by a factor of two average speed over conventional methods. The aim is a better surface quality and dimensional accuracy as well as an increased metal removal rate and thus increased productivity.

In order to be able to use this process, special machines with true-running and high-speed spindles are necessary. For example, a drill with a diameter of 6 mm must reach 21,000 / min so that the desired cutting speed of 400 m / min is achieved at the cutting tips. The drills must also have a special cutting edge geometry in order to absorb the forces that arise and to be able to convey the significantly higher chip volume out of the hole. In order to guarantee a sufficient service life of the tools, the run-out error in the clamped condition must not exceed 10 µm. Finest grain carbides , cermets , cutting ceramics and polycrystalline cubic boron nitride are mainly used as cutting materials , whereby the hard metals and cermets are usually coated with a hard material.

In contrast to conventional processes, only oil is used instead of emulsion as the cooling lubricant (KSS) and pressures of up to 50 bar are used. However, the minimum quantity lubrication with the HSD can also be used economically.

literature

  • Herbert Schönherr: Machining production . Oldenbourg Wissenschaftsverlag, Munich 2002, ISBN 3-486-25045-0 .