Supermini HP and new holder variants
Horn will be showcasing 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.