• Kennametal India Limited

Shrink-Fit Toolholding System

As part of its complete tooling solution from the spindle face to the cutting edge, Kennametal has announced a new Shrink-Fit Toolholding System for machining centres and multi-tasking machines. The new shrink-fit programme is split in two lines. With the GP (General Purpose) line, carbide, HSS, and steel shanks can be accommodated with clamping torques suitable for most general engineering, die and mould, automotive, and other machining tasks. For heavy roughing operations requiring a higher clamping torque level, or for machining difficult-to-cut materials such as those found in the aerospace industry, the HT (High Torque) line is recommended. The HT line has a 30% to 50% higher clamping torque compared to GP line. The results are improved chip removal, faster performance, and increased productivity for the end user. For tolerancing hollow-shank (HSK) tool holders, taper is much tighter than that of any conventional 7/24 taper shanks. For example, with an HSK63A, the taper tolerance is in the neighbourhood of several microns, or roughly one and a half ten-thousandths of an inch. Due to the trend towards higher cutting speeds, all HSK-shrink fit toolholders of the new design have balancing quality of G2.5 at 25,000 RPM. In addition, the new Kennametal shrink-fit programme also accommodates steep taper, BT, CV, and DV back-ends. Key benefits are: a very rigid and accurate connection to the tool holder; a shrinking and cooling process that will not last more than 30 seconds; very precise concentricity (3µm); major process advantages in milling operations; slim profile for chucks for milling deep cavities; through-hole for coolant; axial adjustment/ backstop; and accommodates roughing, semi-finishing and finishing operations.