Method of producing exhaust-gas carrying devices, in particular exhaust-gas cleaning devices

Abstract

A method of producing exhaust-gas carrying devices, in particular exhaust-gas cleaning devices, makes provision that the outer geometry of each substrate is ascertained. An outer housing with an adapted geometry is manufactured dependent on this outer geometry. The substrate, together with a compensation element, are accommodated and clamped in this outer housing.

1 . A method of producing an exhaust-gas carrying devices, in particular an exhaust-gas cleaning device, which has an outer housing with an insert piece clamped therein, the insert piece comprising a substrate, which has exhaust-gas flowing through the substrate, and an elastic compensation element that surrounds the substrate including the following steps:
 a) determining an individual outer geometry of the substrate;   b) ascertaining a geometry of the outer housing that is adapted to the individual outer geometry of the substrate to achieve a required clamping force individually adapted to, and to be exerted on, the insert piece;   c) producing the outer housing with adapted geometry; and   d) mounting and clamping the insert piece in the outer housing, with a closure of the outer housing being effected in at least one of a pressure-controlled and force-controlled manner.   
     
     
         2 . The method according to  claim 1 , wherein, in addition to the determination of the individual outer geometry of the substrate, including the step of determining an individual weight of the elastic compensation element. 
     
     
         3 . The method according to  claim 1 , including producing the adapted geometry of the outer housing by incremental deformation. 
     
     
         4 . The method according to  claim 1 , wherein the outer housing is closed in order to clamp the insert piece. 
     
     
         5 . The method according to  claim 4 , wherein suitable parameters for a closure process are ascertained prior to closing the outer housing. 
     
     
         6 . The method according to  claim 4 , including closing the outer housing in at least one of a pressure-controlled and force-controlled manner. 
     
     
         7 . The method according to any of the  claim 4 , including closing the outer housing is effected in at least one of a distance-controlled and geometry-controlled manner. 
     
     
         8 . The method according to  claim 1 , wherein the substrate is essentially cylindrical and has a base area that deviates from a circular shape. 
     
     
         9 . The method according to  claim 1 , including measuring the substrate to determine the individual outer geometry. 
     
     
         10 . The method according to  claim 1 , including feeding data ascertained for the insert piece into a control unit such that the control unit can establish an individual geometry of an associated outer housing. 
     
     
         11 . The method according to  claim 1 , wherein the exhaust-gas carrying device is at least one of an exhaust-gas catalytic converter and a diesel particle filter. 
     
     
         12 . The method according to  claim 1 , including using a sheet metal housing for the outer housing. 
     
     
         13 . The method according to  claim 1 , including producing the outer housing by wrapping the outer housing around the insert piece. 
     
     
         14 . The method according to claim, including pressing the outer housing against the insert piece in a calibration process. 
     
     
         15 . The method according to  claim 1 , wherein the outer housing is comprised of several shells that are pressed against the insert piece and fastened to each other. 
     
     
         16 . The method according to  claim 1 , including tamping the insert piece into a prefabricated cylindrical outer housing which has an adapted geometry.