Aktiebolaget Skf

Skf Industrie Spa

Erling Zackrisson

Franco Caldana

Adelmo Balagna

A cold rolling method and apparatus for forming an annular workpiece () with an outer surface () having a given contour and an inner surface () having a given contour, starting from an annular blank. A rotatable forming mandrel () has a working surface () with a contour corresponding to that of inner surface () to be formed. A forming die () has a cavity () with an inner working surface () in form of a surface of revolution corresponding to the outer surface () to be formed.

Cold rolling method and apparatus for forming annular pieces

A number of annular or short tubular elements are obtained from an elongate tube having a length calculated as a multiple of the length of the elements. A tube is automatically transferred into a chuck of a twin-spindle lathe to turn the inner bore of an end portion of the tube. The end portion is then cut off the tube, thereby obtaining an annular element. The element is automatically reversed and fitted to a mandrel for turning its outer surface and its end where the cutting was performed. The so finished or partly-finished element is then automatically delivered to an outfeed conveyor. Such a sequence is repeated cyclically until the last portion of the tube is processed, leaving no waste tips of the tube. A numerically controlled lathe for performing the process is also disclosed.

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Göteborg, Sweden

Erling Zackrisson