According to Sumitomo Electric Hardmetal, key to the capability of the Sumi Dual Mill TSX series of higher efficiency, 90° shoulder mills is the combination of fine-carbide insert press/sintering technology with precision profile-grinding techniques. This enables the periphery ground inserts used with the new tangential cutter body design, which is available in standard, medium and fine-pitch versions, to generate high levels of surface finish.

The TSX series is based on the use of tangentially mounted carbide inserts offering a choice of chip-breakers: L for low-rigidity machine set-ups, G for general purpose operations and H where a stronger insert edge is required to support tasks such as rough, heavy interrupted and hard-steel milling, for example.
Sumitomo’s TSX shoulder mills comprise shell-type bodies between 40 and 160 mm diameter, and shank-type bodies between 16 and 160 mm diameter, to support operations such as face and shoulder milling, slot milling, and side and face-milling tasks. Two sizes of insert, each with four corners, are precision ground to accommodate 8 or 12 mm depths of cut.
A recent customer trial witnessed the milling of a workpiece made from 42CrMo4 alloy steel. Using a TSX shell cutter body combined with ACP200 grade inserts and G-type chipbreaker, the process (with coolant) was run at 270 m/min cutting speed, 0.05 mm/rev feed and 8 mm depth of cut. Not only did the Sumitomo set-up improve component wall quality, it increased the number of parts produced from 135 to 220.
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