For parting off at high feed rates, Horn has introduced the new EH geometry, a development based on the manufacturer’s S100 grooving system. The single-edged insert is available in widths of 3 mm and 4 mm. The stable cutting edge enables feed rates in the range f = 0.25 to 0.4 mm/rev during grooving and parting, leading to fast cycle times. Reliable swarf control and evacuation are ensured by special formation of the chips.
High infeed requires a stable machine as well as secure clamping of the workpiece. From a feed rate of 0.3 mm/rev, Horn recommends reducing the infeed for the first 3 to 4 mm during grooving and parting off.
Due to their stability, S100 holders and cassettes for grooving along the Y-axis are the first choice when machining at these elevated feed rates. The process enables high-performance, vibration-free parting with high cutting values, leading to short machining times.
Especially when parting off workpieces of larger diameter, high moments of force are generated. The space available in a machine often does not allow the use of tools of larger cross section. With the new arrangement of the insert in the tool holder, the cutting forces are absorbed by the main cross section of the parting tool holder, resulting in greater overall rigidity for a given tool width and hence higher feed rates. Alternatively, a narrower holder may be used to achieve the same system rigidity.
