Patent ID: 9714708
Date: 2017-07-25
CPC Classifications: F01N,F16J,F16L,Y10T

Claim:
1. A method of manufacturing a cylindrical gasket for use in an insertion-type exhaust pipe joint, comprising the steps of: (1) compounding a graphite powder, an inorganic binder, and distilled water at a predetermined ratio and compounding them to fabricate a wet heat-resistant material containing the graphite powder and the inorganic binder; (2) passing a tubular metal wire net obtained by weaving a fine metal wire between a pair of rollers so as to be compressed in a radial direction to fabricate a belt-shaped metal wire net; (3) supplying the heat-resistant material to both surfaces of the belt-shaped metal wire net and rolling the heat-resistant material by the rollers to fill meshes of the belt-shaped metal wire net with the heat-resistant material, and subsequently drying the heat-resistant material filled in the meshes of the belt-shaped metal wire net to remove water in the heat-resistant material, to thereby form a composite belt-shaped member in which the heat-resistant material is filled and held in the meshes of the belt-shaped metal wire net; (4) convoluting the composite belt-shaped member into a cylindrical shape by at least two turns to fabricate a tubular base member; and (5) inserting the tubular base member into a cylindrical hollow portion of a die and subjecting the tubular base member to compression forming in the die in an axial direction thereof, wherein the cylindrical gasket includes: a reinforcing member made from the compressed belt-shaped metal wire net; the heat-resistant material filled in the meshes of the belt-shaped metal wire net of said reinforcing member and containing the graphite powder and the inorganic binder which are compressed; and pores which are dispersedly distributed in the reinforcing member and the heat-resistant material, and wherein said reinforcing member and said heat-resistant material are intertwined with each other so as to be provided with structural integrity, and with respect to a total volume of the cylindrical gasket, said reinforcing member occupies a volume of 32 to 60%, the heat-resistant material occupies a volume of 5 to 58%, and the pores occupy a volume of 10 to 35%.