Abstract: A tool making joints of clinch type between two or several sheet formed members, which tool comprises two separate tool parts, a first tool-part with a punch and a second tool-part provided with a die which co-operate for producing said joint. The punch is arranged to be driven in a linear movement in the direction of the co-axial die provided with a die cavity at the bottom of which an anvil (3) is arranged. A spring element (5) having the general form of a cylindrical cage has a surface which has been provided with a number of slots to form a corresponding number of long elastic arms (11) partitioned around the circumference of the cage with their free ends at the upper edge of the cage.

Abstract: Cutting and skiving patterns to be used in the production of product rolls from a master roll are selected so as to optimize trim efficiency. The product rolls have widths ordered by customers. In selecting these cutting and skiving patterns, cutting patterns that can be used to trim master rolls of the same or different dimensions in order to fill customer orders for the product rolls are generated, skiving patterns for skiving auxiliary rolls that result from trimming the master roll in order to produce the product rolls according to the customer orders are generated, and those of the generated skiving and cutting patterns that optimize trim efficiency for the production of the product rolls are selected.

Abstract: An apparatus and method for forming a duct member having a plurality of adjustable sections which are rotatable relative to one another. The apparatus and method causes relative rotation between individual sections during the manufacturing process, to form a completed duct member in an automated process utilizing a rotating head assembly comprising a plurality of engagement members extendable radially outward of the rotating head body in an engagement position and retractable radially inward to a disengagement position. Accordingly, a 90 degree adjustable elbow can be produced in its 90 degree elbow configuration without requiring the machine operator to manually adjust the adjustable sections.