Apparatus and method for manufacturing a socket end of a pipe part provided with a sealing ring

aaaApparatus for manufacturing a socket end which is provided with a sealing ring. The apparatus comprises an outer mould for forming the outer contour of the sealing ring and for forming the outer side of the socket end, and a core for forming the inner side of the socket end and the sealing ring. The core comprises a first core part, a sleeve-like core part which can be displaced on the first core part, for forming a front for the sealing ring, a core part which adjoins the first core part and can be contracted in the radial direction, for forming the inner contour of the sealing ring, and a second core part, which adjoins the contractable core part, for forming the inner side of the pipe part. The contractable core part has a radially innermost position with an external diameter which is smaller than the internal diameter of the sleeve -like core part.