METHOD OF MANUFACTURING A VALVE WITH A HIGH MECHANICAL AND HEAT RESISTANCE, ALSO AGAINST HEAT CORROSION, FOR A COMBUSTION ENGINE USING HEAVY OIL

摘要

1. Method of manufacturing a gas exchange valve with a high heat and mechanical resistance, and protected against corrosion, for a combustion engine using heavy oil, on the valve disc (1) of which an armoured valve seat is made in such a way that armoured material (3) introduced into a circumferential depression (2) and preferably comprising a nickel- or cobalt-based superalloy is merged by a remelt process with the basic valve material, and then a valve seat surface (4) and a valve disc peripheral surface (5) are ground on this armoured layer, characterized in that after the guiding of the valve seat surface (4) and the valve disc peripheral surface (5) the externally running boundary seams (6, 7) are remelted in a locally restricted manner by directed application of heat at the transition between the basic valve material and the armoured material (3) to obtain two protective layers (8, 9) running round the valve disc (1).