# US 10,245,680 B2 · Cladding method for valve seat and production method for cylinder head > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,245,680 B2 - Document ID: US10245680B2 - Status: Granted - Kind: B2 - Application number: 14/900,910 - Filed: 2014-05-16 - Published: 2016-05-19 - Granted: 2019-04-02 - Earliest claimed: 2013-07-01 - Assignees: Toyota Jidosha Kabushiki Kaisha - Applicants: Toyota Jidosha Kabushiki Kaisha - Inventors: Minoru Kawasaki; Kenji Kidera; Yoshiji Shoda - Web page: https://patentgrep.com/patent/US10245680B2 ## CPC - B23K 26/34: Laser welding for purposes other than joining - B23K 26/144: the fluid stream containing particles, e.g. powder - B23K 26/1464: {Supply to, or discharge from, nozzles of media, e.g. gas, powder, wire} - F01L 3/02: Selecting particular materials for valve-members or valve-seats; Valve-members or valve-seats composed of two or more materials - F01L 3/04: Coated valve members or valve-seats - F01L 3/22: Valve-seats not provided for in preceding subgroups of this group; Fixing of valve-seats - F01L 3/24: Safety means or accessories, not provided for in preceding sub- groups of this group - F02F 1/4285: {of both intake and exhaust channel} - B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM - F01L: CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES - F02F: CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES ## Abstract A cladding method for a valve seat in a cylinder head blank includes a combustion chamber, an intake port or an exhaust port communicating with the combustion chamber, and an annular countersunk groove formed in an opening end of the port on the combustion chamber side, the method being for forming a cladding layer by irradiating metal powder supplied in the countersunk groove with a laser beam. A gas flow regulating wall is provided, which projects from the countersunk groove to an inner side of the countersunk groove and to the combustion chamber side, gas is sprayed during irradiating with the laser beam, and the gas is flown by the gas flow regulating wall from the inner side to an outer side of the countersunk groove. ## Claims ### Claim 1 A cladding method for a valve seat in a cylinder head blank provided with an intake port and an exhaust port communicating with a combustion chamber, comprising: forming an annular countersunk groove in an opening end of at least one of the intake port and the exhaust port on a combustion chamber side, providing a gas flow regulating wall which projects from the annular countersunk groove to an inner side of the annular countersunk groove and to the combustion chamber side, the gas flow regulating wall having an upper surface that faces toward the combustion chamber side and that inclines upwardly as the upper surface progresses from an edge of the annular countersunk groove toward a center of the annular countersunk groove, supplying metal powder to the annular countersunk groove, spraying gas on the metal powder and flowing the gas by the upper surface of the gas flow regulating wall from the inner side to an outer side of the annular countersunk groove, while the metal powder is irradiated with a laser beam to form a cladding layer, the flowing of the gas pushing the cladding layer in a molten state toward the outer side of the annular countersunk groove, and removing the gas flow regulating wall from the cylinder head blank after the cladding layer has been formed. ### Claim 2 (depends on 1) The cladding method according to claim 1, wherein the gas is discharged from a laser machining head that emits the laser beam. ### Claim 3 (depends on 2) The cladding method according to claim 2, wherein the metal powder is discharged together with the gas from the laser machining head. ### Claim 4 (depends on 2) The cladding method according to claim 2, wherein an optical axis of the laser beam is coaxial with a discharge axis of the metal powder. ### Claim 5 (depends on 1) The cladding method according to claim 1, wherein the gas flow regulating wall is formed integrally with the cylinder head blank. ### Claim 6 (depends on 1) The cladding method according to claim 1, wherein the gas flow regulating wall is formed so as to be detachable from the cylinder head blank. ### Claim 7 A production method for a cylinder head, comprising: a first step of forming a cylinder head blank provided with an intake port and an exhaust port communicating with a combustion chamber; a second step of forming an annular countersunk groove in an opening end of at least one of the intake port and the exhaust port on a combustion chamber side; a third step of providing a gas flow regulating wall projecting from the annular countersunk groove to an inner side of the annular countersunk groove and to the combustion chamber side, the gas flow regulating wall having an upper surface that faces toward the combustion chamber side and that inclines upwardly as the upper surface progresses from an edge of the annular countersunk groove toward a center of the annular countersunk groove; a fourth step of forming a cladding layer for a valve seat by supplying metal powder in the annular countersunk groove, and spraying gas to the metal powder and flowing the gas by the upper surface of the gas flow regulating wall from the inner side to an outer side of the annular countersunk groove, while the metal powder is irradiated with a laser beam, the flowing of the gas pushing the cladding layer in a molten state toward the outer side of the annular countersunk groove; and removing the gas flow regulating wall from the cylinder head blank after the fourth step. ### Claim 8 (depends on 7) The production method according to claim 7, wherein, in the fourth step, the gas is discharged from a laser machining head that emits the laser beam. ### Claim 9 (depends on 8) The production method according to claim 8, wherein, in the fourth step, the metal powder is discharged together with the gas from the laser machining head. ### Claim 10 (depends on 8) The production method according to claim 8, wherein an optical axis of the laser beam is coaxial with a discharge axis of the metal powder. ### Claim 11 (depends on 7) The production method according to claim 7, wherein the gas flow regulating wall is formed integrally with the cylinder head blank, and the gas flow regulating wall is removed by machining from the cylinder head blank after the fourth step. ### Claim 12 (depends on 7) The production method according to claim 7, further comprising a fifth step of forming a valve seat by machining the cylinder head blank in which the cladding layer has been formed. ### Claim 13 (depends on 7) The production method according to claim 7, wherein the gas flow regulating wall is formed so as to be detachable from the cylinder head blank, and the gas flow regulating wall is mounted on the cylinder head blank after the second step and before the fourth step.