Process and apparatus for milling saw teeth with a positive angle of rake in a metal strip, in particular in a bimetallic strip

摘要

In order to mill positive angles of rake in metal-cutting band saws, a cylindrical plain milling cutter with suitable milling teeth, the milling axis of which is arranged in the centre plane of a pack of strips, is moved by the angle of rake obliquely with respect to its axis, that is with a radial and an axial feed component. During this movement, it mills teeth gaps step by step into a section of the strips. By means of different feed displacements when travelling forwards and backwards, saw teeth back and saw teeth front can be produced with a shape other than that of the milling teeth, as shown in the drawing. On a horizontal plane, the clamping carriage with the strips can be displaced axially and the milling housing with the milling tool can be displaced radially with respect to the milling axis on guides. The two setting devices are either connected by an adjusting gear mechanism or are provided with separate drives jointly controlled on an open-loop or closed-loop basis. Adjustment and open-loop or closed-loop control are performed by preselection, sensing of a cam disc or a computer program. <IMAGE>