PRODUCTION OF BUILD-UP VALVE FOR INTERNAL-COMBUSTION ENGINE

摘要

PURPOSE:To make uniform the material quality of a laser build-up part over the entire part of a valve face part by irradiating laser light on said part and spraying a cooling medium to the rear side of the irradiated part during the time when the laser light returns again to the initially irradiated part. CONSTITUTION:Laser build-up is executed by rotating gradually an exhaust valve 1 while supplying build-up alloy powder 3 from a build-up alloy powder supplying device 4 to the valve face part 2 of the valve 1, supplying at the same time a shielding gas thereto from a shielding gas supplying device and irradiating the laser light 5 on said part. A cooler 6 installed apart at a prescribed distance from a head bevel 12 is operated upon starting of the irradiation of the light 5 to spray the cooling water 11 to the head 12. The generated steam is sucked and discharged to the outside through a conduit 9 by a suction pump. The irradiated part is thus cooled during the time when the laser light 5 returns again to the part irradiated first with the laser light and therefore the heating up to the high temp. at which dilution arises is obviated and the material quality uniform over the entire build-up layer is obtd.