GB355580A - Improvements in or relating to milling cutters - Google Patents

Abstract

355,580. Milling - cutters. BROMBACHER, H., Turbenthal, Switzerland.- (Assignee of Maschinen und Werkzeugfabrik Akt.-Ges. Turbentbal; Turbenthal, Switzerland.) Oct. 24, 1930, No. 32061. Convention date, Oct. 28, 1929. [Class 83 (iii).] In a milling cutter having detachable cylindrical cut tin g tools, the tools 2 are mounted in complementary semi - cylindrical recesses formed respectively in the cutter body 5 and a clamping member 3 and each tool is formed with a helical groove so that correct cutting and clearance angles for both the radial and the axial cutting edges may be obtained, these angles being altered according to the material being cut by rotating the tools about their axes. In one form, Figs. 1 and 2, the tools are arranged diametrically in pairs, each pair being secured by a screw 4. The tool body has extensions 6 to support the tools near the cutting points. In a modification, Fig. 3, the tools are arranged circumferentially, each pair being secured by a segmental clamping piece 3 and screw 4. In a similar modification, Fig. 6, the tools are arranged at an inclination to the cutter axis. The tools may also be inclined to planes passing through the cutter axis. In some cases the clamping pieces may be arranged on the inside instead of on the outside of the body. In a further modification, Figs. 9 and 10, the tools are arranged on three concentric circles, the outer clamping pieces 3a each being arranged to secure one tool 2a of the outer row and another tool 2b of the middle row. The inner tools 2c are secured by clamping pieces 3c and screws 4c. The cutter body and the clamping pieces are of stepped formation, Fig. 10, so as to support the tools close to the cutting points. Other modifications are shown in Figs. 12 and 14.