Industrial Products and Applications - archive issue - year , issue 2, april-may 2021

Supermini HP and new holder variants and new coating IG35

Versatile application
Horn showed a new variant of the successful precision tooling system at EMO 2019. The new HP geometry is suitable for drilling, boring, face turning and skimming. With this, Horn is offering a multi-functional tool for multiple applications. The new cutting geometry enables higher cutting parameters including infeed rates. When boring, this results in an accurate 90-degree shoulder at the base. The trailing cutting edge (wiper geometry) produces high surface qualities, even at high feed rates.

In addition to turning operations, the system is also suitable for drilling into solid material in diameters ranging from 3 mm (0.118") to 7 mm (0.276"). The performance data of the tool cannot compete with normal drills, but there is often a lack of locations for tools in a machine. The Supermini HP offers the option of immediately boring an inner contour after drilling, without needing to change the tool. With the single-edged version, various bore diameters can be produced using a single tool.

Horn provides tools for optimum chip control with and without a chipbreaker. For turning, the variant with a chipbreaker is recommended. The chipbreaker version is not used for drilling. The slightly twisted flute removes chips from the machining zone. The EG35 tool coating allows versatile machining of both normal and stainless steels.

As well as the new geometries, Horn has developed a new holder system for the Supermini type 105. In the new design, clamping is achieved using a tensioning wedge on the face rather than on the circumference, as was previously the case. This enables the cutting insert to be held in place with more force, which in turn makes the entire system more rigid. Moreover, the new clamping design results in a higher level of repeatability when changing inserts and allows better use to be made of the available space thanks to the face clamping concept.

This is a significant advantage when working with Swiss-type lathes, as it enables users to change the insert without removing the tool holder.

High heat resistance
The new IG35 insert coating allows Horn to offer high performance and long tool life when machining stainless steels, titanium alloys and superalloys. In combination with the 3V and FY geometries, the aluminium titanium silicon nitride coating prevents the formation of built-up edges due to the low coefficient of friction. Thanks to HiPIMS coating technology, the coating exhibits very smooth properties and high heat resistance. Furthermore, the tool coating is free from defects such as inclusions or other coating faults at the cutting edge.

Horn adapts the coating system, the chipbreaker geometries and the micro-geometries to applications such as internal and external grooving, longitudinal turning, circular interpolation milling and solid carbide milling. The user can achieve higher cutting parameters, enabling a shorter cycle time, which in turn has a positive impact on unit production costs. The use of the new coating also leads to higher surface qualities.

The IG35 coating is available for the S100, S101, S224, S229, and S274 grooving systems as well as for the circular interpolation milling and solid carbide milling systems.

Contact person for enquiries:
Hartmetall-Werkzeugfabrik Paul Horn GmbH, Christian Thiele
Horn-Straße 1, 72072 Tübingen
Tel.: +49 7071 7004-1820, Fax: +49 7071 72893