Jakob Lach Gmbh & Co. Kg

Horst Lach

Eugen Maurer

The invention relates to a drilling tool (), in particular a dowel hole drill, for the machining of workpieces, in particular workpieces made of wood, plastics, composite materials, comprising a drill shaft () with a front surface (), and to a drill head () with at least one cutting edge (), which is firmly connected, such as soldered, to the drill shaft (). In order to make available a drilling tool of the type mentioned at the start, which has a broad range of application and is simple to produce, it is provided that the drill head () is formed from a composite material with exclusively two layers (), namely a hard metal layer () and an ultra-hard layer () which is connected to the hard metal layer () and preferably formed from polycrystalline diamond or polycrystalline boron nitride, that the ultra-hard layer () is connected directly to the front surface () of the drill shaft () and that the at least one cutting edge () is formed by the ultra-hard layer (), and a drill bit () such as a centering tip is formed by the hard metal layer ().

Method for producing a cutting tool for the machining of workpieces and cutting tool

The profile turning tool is used for rough-turning and dressing circumferential and flat surfaces, in particular of workpieces made of light metals. It consists of a holder () with a receiver () for a diamond cutting head () as well as a claw (), which is embodied as a chip breaker, engages a longitudinal groove () in the holder () and braces the cutting head () by means of a tightening screw (). The groove () is located directly behind the cutting head (). In longitudinal section, its base has an arcuate, concave shape and represents a pivot bearing for the claw () that has a correspondingly shaped underside and is guided on the lateral walls of the groove (). The tightening screw () extends in front of the center of the arc with play through a hole in the claw ().

Growing community of inventors

Hanau, Germany

Horst Lach