Cladding method for valve seat and production method for cylinder head

Patent metadata

Field	Value
Publication number	US-2016136758-A1
Application number	US-201414900910-A
Country	US
Kind code	A1
Filing date	May 16, 2014
Priority date	Jul 1, 2013
Publication date	May 19, 2016
Grant date	—

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.

First claim

1 - 13 . (canceled)

14 . 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,
supplying metal powder to the countersunk groove, and
providing a gas flow regulating wall which projects from the countersunk groove to an inner side of the countersunk groove and to the combustion chamber side, and
spraying gas on the metal powder and flowing the gas by the gas flow regulating wall from the inner side to an outer side of the countersunk groove, while the metal powder is irradiated with a laser beam.

15 . The cladding method for a valve seat according to claim 14 , wherein the gas is discharged from a laser machining head that emits the laser beam.

16 . The cladding method for a valve seat according to claim 15 , wherein the metal powder is discharged together with the gas from the laser machine head.

17 . The cladding method for a valve seat according to claim 15 , wherein an optical axis of the laser beam is coaxial with a discharge axis of the metal powder.

18 . The cladding method for a valve seat according to claim 14 , wherein the gas flow regulating wall is formed so as to be detachable from the cylinder head blank.

19 . The cladding method for a valve seat according to claim 14 , wherein the gas flow regulating wall is formed integrally with the cylinder head blank.

20 . 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 countersunk groove to an inner side of the countersunk groove and to the combustion chamber side; and a fourth step of forming a cladding layer for a valve seat by supplying metal powder in the countersunk groove, and spraying gas to the metal powder and flowing the gas by the gas flow regulating wall from the inner side to an outer side of the countersunk groove, while the metal powder is irradiated with a laser beam.

21 . The production method for a cylinder head according to claim 20 , wherein,
in the fourth step, the gas is discharged from a laser machining head that emits the laser beam.

22 . The production method for a cylinder head according to claim 21 , wherein,
in the fourth step, the metal powder is discharged together with the gas from the laser machining head.

23 . The production method for a cylinder head according to claim 21 , wherein
an optical axis of the laser beam is coaxial with a discharge axis of the metal powder.

24 . The production method for a cylinder head according to claim 20 , wherein
the gas flow regulating wall is formed so as to be detachable from the cylinder head blank, the gas flow regulating wall is mounted on the cylinder head blank after the second step and before the fourth step, and the gas flow regulating wall is removed from the cylinder head blank after the fourth step.

25 . The production method for a cylinder head according to claim 20 , wherein,
in the fourth step, 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.

26 . The production method for a cylinder head according to claim 20 , further comprising a fifth step of forming a valve seat by machining the cylinder head blank in which the cladding layer is formed.

Assignees

• Toyota Motor Co Ltd
• Toyota Jidosha Kabushiki Kaisa

Inventors

• Kawasaki Minoru
• Kidera Kenji
• Shoda Yoshiji

Classifications

• F01L3/24

  Safety means or accessories, not provided for in preceding sub- groups of this group · CPC title

• F01L3/22

  Valve-seats not provided for in preceding subgroups of this group; Fixing of valve-seats · CPC title

• F01L3/04

  Coated valve members or valve-seats · CPC title

• F01L3/02

  Selecting particular materials for valve-members or valve-seats; Valve-members or valve-seats composed of two or more materials · CPC title

• B23K26/34 Primary

  Laser welding for purposes other than joining · CPC title