Method for producing a dimensionally accurate honeycomb body
View Patent ↗A method for producing a honeycomb body having a honeycomb structure disposed in a housing, includes at least forming a honeycomb structure, inserting the honeycomb structure into a housing, carrying out a heat treatment operation on the honeycomb structure having the housing, contacting outer regions with a molding, at least during the inserting step or the heat treatment step, and reproducing a desired outer contour of the housing with contact faces of the molding. A molding and an exhaust gas treatment unit produced with a thin housing in a dimensionally accurate manner, are also provided.
1. A method for producing a honeycomb body having a honeycomb structure disposed in housing, the method comprising the following steps:
a) forming a honeycomb structure;
b) inserting the honeycomb structure into a housing;
c) coating the honeycomb body and/or forming sintered, brazed and/or welded connections within the honeycomb structure by carrying out a heat treatment operation on the honeycomb structure having the housing;
d) contacting outer regions of the housing with a single molding, at least during steps b) and c); and
e) ensuring dimensional accuracy of the honeycomb body by reproducing a desired outer contour of the housing with contact faces of the molding.
2. The method according to claim 1 , which further comprises producing a non-circular cross section of the housing of the honeycomb body during step c).
3. The method according to claim 1 , which further comprises placing the molding in contact with the outside of the housing before step b), and removing the molding after step c).
4. The method according to claim 1 , which further comprises carrying out the step of contacting outer regions of the housing with the molding during at least one of the following processing steps:
providing brazing material to the honeycomb body;
coating the honeycomb body; and
transporting the honeycomb body.
5. A method for producing a honeycomb body having a honeycomb structure disposed in housing, the method comprising the following steps:
a) forming a honeycomb structure;
b) inserting the honeycomb structure into a housing;
c) coating the honeycomb body and forming sintered, brazed and/or welded connections within the honeycomb structure by carrying out a heat treatment operation on the honeycomb structure having the housing;
d) contacting outer regions of the housing with a single molding, at least during steps b) and c); and
e) ensuring dimensional accuracy of the honeycomb body by reproducing a desired outer contour of the housing with contact faces of the molding.
6. The method according to claim 1 , wherein the housing is closed in a peripheral direction.
7. The method according to claim 1 , which further comprises maintaining a desired shape or configuration of the housing with the molding in step e).