Weingartner Maschinenbau Gesellschaft M.b.h.

Dr. Techn. Ernst Linsinger & Co. Gmbh

Erwin Fuchs

Helmut Rungger

A multi-screw extruder consists of contra-rotating screws (20) inserted in a housing, whose flights (1) form intermeshing crests (2) and roots (3), and which have at least two axial sections (21, 22, 23) of flights each differing in number and pitch. To improve the manufacturing conditions, and to achieve uniform wear conditions over the screw length, adjacent axial sections (21, 22, 23) of a screw (20) verge into each other within an axial transition zone (24) free from annular grooves, where all roots (3) extend through the transition zone (24) while making turns (.alpha.) and forming ramifications or combinations (V), and at least one of the crests (2) begins or ends in the transition zone (24).

Twin-screw extruder

To manufacture inner and outer parts for a rotary piston machine in which said parts have parallel axes and have interengaging helical engaging surfaces having convolutions in numbers differing by one and are operable to perform relative to each other rotating and eccentric revolving movements, the helical engaging surface of at least one of said parts is machined by a cutting tool, which is rotated about an axis which is parallel to and spaced from the axis of the part that is to be machined. To permit an economical machining of said helical engaging surfaces and to achieve a very good surface finish on said engaging surfaces, a tool which is provided with teeth on an end face and on its peripheral surface is used to machine the helical engaging surface of the one part and those teeth which are provided on the peripheral surface of said tool conform as regards their arrangement and the design of their cutting edges to the profile of the helical engaging surface of the other part, that the tool and said one part are subjected to a feed movement relative to each other, which feed movement is composed of a basic feed movement, which corresponds to the relative operating movement of the inner and outer parts, and of a superposed movement, which corresponds to the desired helical shape of the engaging surface to be machined.

Process for manufacturing inner and outer parts for a rotary piston

Method and apparatus for machining the edges of sheet-like work pieces, using cutting elements disposed on rotating milling tools. The invention uses a conical tool with cutting tools on the conical jacket thereof. The active cutting tool which is closest to the work piece is located in the plane of the machining and a conical angle .alpha. in the range of about 150.degree. to about 180.degree. is utilized.

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Altmunster, Austria

Erwin Fuchs