Patent ID: 8024954

Claim:
A method for making a cold-worked component for a pipe system with at least one projecting pipe branch, including the following process steps: a) cold forming a circular blank into a pot-shaped component with largely rotational-symmetrical shape; b) providing the pot-shaped component with a number of openings in its side and/or end faces; c) drawing at least one of the openings into a pipe branch by forcing at least one ball or a drawing tool with partially spherical surface in a direction outwards from an inner cavity in the pot-shaped component; wherein, before the drawing of an opening in step c), clamping of the component in a matrix tool composed of several parts including a top matrix, a bottom matrix, a first fixing mandrel and a second fixing mandrel is performed, the parts of the matrix tool being closely fit to the greater part of the external surfaces of the component to be cold-worked.