Walter Ag

Hans Peter Durr

Siegfried Bohnet

Siegfried Deiss

Thomas Schneider

Lothar Fauser

Wolfgang Votsch

To facilitate manufacture and stocking of inserts for the ball end of a ball milling cutter, identical asymmetrical cutting inserts which are of generally pointed, elongated leaf shape, define two end points or tips, with two cutting edges opposite a theoretical straight line connecting the tips. The cutting edges (14, 15) each have at least one curved portion (24, 26) and an adjoining elongated, roughly straight portion (23, 25). The lengths of the respective curved portions and straight portions on the two cutting edges are different, and the edges and their respective lengths and positions with respect to an attachment hole (17) are so arranged that the first cutting edge of one insert on one side cuts on a ball surface which extends at least up to approximately the center line of the milling tool, and the straight cutting edge merges into a cylindrical surface. The curved portion (26) of the other cutting edge (15) of a second, identical insert completes the ball cutting surface and also merges into a cylindrical surface, so that, in operation, one longer and one shorter curved portion, respectively, on both inserts are actively cutting. When the cutting edges are worn, the inserts are interchanged on the respective plate seats of the milling cutter so that the previously inactive shorter or longer curved edge, cut at the end surface.

Milling cutter, particularly for copying, and cutting insert therefor

A cutting bit, in particular an indexable cutting bit, has a polygonal base body with a flat bottom side (1), a flat or structured top side (4) spaced apart from the bottom side, and a number of side surfaces (2) adjoining one another, forming corners (3). On the top side, the base body is beveled to descend in the outward direction of the region of the chip removing surface at at least one corner (3), in such a way that at the corner a delimited region (9) is formed that is inclined with respect to the bottom side (1). In this inclined region (9), on one side of the corner (3), the main cutting edge (5a , 5b) extends to the vicinity of the corner (3), while on the other side of the corner in the inclined region a plane, or facing, cutting edge (5c) is formed, which essentially adjoins the main cutting edge, and the portion of the main cutting edge located in the inclined region (9) has essentially at most the same length as the plane cutting edge.

Cutting bit, in particular indexable cutting bit

A cutting bit formed as a round plate for a material removal tool has a base body, which is defined by a bottom face, a top opposite it and spaced apart from it, and a side face between them. The side face, with a chip face located on the top, defines a circular cutting edge. For securing the bit, a central opening which can receive a securing screw, for instance, is provided. To secure the cutting bit in a tool body in a manner fixed against relative rotation, a plurality of depressions, for instance, are provided on the top of the cutting bit and can be engaged by a clamping claw supported on the tool body. Circumferential forces engaging the cutting bit are diverted by way of these depressions, thus preventing torsion or twisting of the cutting bit.

Growing community of inventors

Gomaringen-Stockach, Germany

Hans Peter Durr