Patent ID: 9221126
Filing Date: 2015-12-29
Classification: B21C,B21D,B23K,F02B,F04F,Y10T

Abstract:
1. A method for producing a cellular wheel from metal, having sleeves which lie concentrically with respect to a rotational axis and fins, which are arranged between sleeves which follow one another, are oriented radially with respect to the rotational axis, are joined with an end edge to a sleeve, and are fixed in their angular position before the joining of the free end edges to a following sleeve, wherein (a) placing a tool onto free end edges of the fins with a cylindrical inner circumferential face, the diameter of which corresponds to the internal diameter of the following sleeve, in order to fix the fins in their angular position, (b) introducing a molding material mixture comprising a fire-resistant basic molding material and a binding agent which can be hardened and can be released from the basic molding material by thermal treatment into cells, which are delimited by the inner circumferential face of the tool and the fins, and hardening said molding material mixture, (c) after the removal of the tool, placing the following sleeve onto the free end edges of the fins which are fixed in their angular position by the hardened molding material mixture, (d) joining the free end edges of the fins to the following sleeve by welding or brazing to the cells, and (e) thermally treating the hardened molding material mixture and removing the basic molding material from the cells, wherein the tool has longitudinal grooves which emanate radially from the inner circumferential face and into which the free end edges of the fins which have an oversize are inserted before the introduction of the molding material mixture, and wherein the oversize of the fins which projects out of the hardened molding material mixture after the removal of the tool is removed before the following sleeve is placed onto the free end edges of the fins.