Kristen + Görmann, tools systems made in Renchen

One of many reasons why the Kristen + Görmann KG carbide tool factory relies on SCHNEEBERGER technology. Around 70 employees manufacture high-precision tooling systems that are used in numerous industries around the world. The family-run innovation company headed by John Görmann is a true ‟hidden champion” in a challenging market.

The tool systems developed by K+G are made up of special tool holders that are fitted with different indexable inserts or profiled indexable inserts to meet specific requirements. The most common areas of application can be found in the synchronised, rotary machining of precise components, predominantly in the automotive industry, as well as other sectors. Special attention is paid to the requirements to the production of gearboxes. Chamfering and rounding, back tapering, notching and flute milling as well as profiling and gear cutting have to be mentioned.

The indexable inserts in the tool holders have a significant impact on the demanded quality and performance in the manufacturing and production of the parts. In fact, the more intelligent the indexable inserts are arranged in the toolholder, the more different and geometrically complex a machining processes can be reliably carried out in one single operation. This reduces machining time and consequently the production costs per part thanks to the reduced tool changeover and machining cycles.

For years, K+G has placed their trust in nine tool grinding machines from SCHNEEBERGER for the production of indexable inserts. Four siriusNGS belong to the latest generation of SCHNEEBERGER machines. Maximum mechanical and thermal stability are essential for achieving the required precision and a repeatable high production quality. The siriusNGS is able to grind high-precision profile indexable
inserts in automated mode in all three shifts. They are designed for large batch sizes at maximum automation, and also for small or very small series. Every imaginable requirement of modern production can be implemented easily and routinely.

The Qg1 CAD/CAM grinding software developed by SCHNEEBEGER supports K+G tool grinders with optimum ergonomics and efficiency. This is achieved by graphically displaying all geometry data, as well as 3D simulation of the grinding path, including collision control. All imaginable geometries and profiles of an indexable insert can be reliably ground using the Qg1

CAD/CAM grinding software and the optimally arranged six machine axes of the siriusNGS. This freedom in implementing new tool systems gives Kristen + Görmann KG a major and indispensable advantage.

A wide variety of production and machining steps are necessary before a tool system is used by K+G’s demanding customers. These include:

• In-depth production experience and engineering expertise for the design of the required turning, grooving or milling processes
• Determination of the indexable insert geometry and tool holder required for this purpose
• Surface and peripheral grinding of the indexable insert
• High-precision profile grinding of the indexable insert on SCHNEEBERGER siriusNGS
• Edge preparation of the cutting edges
• Indexable insert coating optimized for the material to be machined

SiriusNGS offers a wide range of accessories for the technology of grinding indexable inserts:

• Double ended grinding spindle for extra large grinding wheel diameters
• High-frequency spindle for highest speeds, which is necessary for geometries with small radii, pockets as well as chip breakers
• Automatic grinding wheel dresser for profiling or reconditioning grinding wheels

Capability requirements for a grinding machine at K+G:

• Quick changeover
• Simple programming
• High process stability and rigidity
• Individual part production and smallest batch sizes
• Automated production of series with 6-axis robot

Holger Joswig, J. SCHNEEBERGER Maschinen GmbH