| 摘要 |
The present invention relates to a method for manufacturing an exhaust valve spindle of a marine engine, which comprises: a step of molding a head unit and a stem unit by using stainless steel as a base material; a step of forming a ring-shaped groove along the surface edge of a sheet of the head unit; a step of forming a weld region on the groove; and a step of forming a coating unit through a thermal spray coating method which has a nickel alloy applied to the bottom of the head unit. The method for manufacturing an exhaust valve spindle of a marine engine according to the present invention is provided to replace a conventional base material, a nickel alloy used to manufacture an exhaust spindle of a marine engine, with stainless steel and to prevent the nickel alloy from being excessively used according to welding methods and defects from being generated during a welding process by using a thermal spray coating method which has the nickel alloy applied to the base material of the bottom of the head unit, thereby significantly lowering defect rate, reducing production costs, and improving the wear resistance, corrosion resistance and durability of a product. [Reference numerals] (AA) Start; (BB) End; (S10) Upset stainless steel as a base material, and mold a head unit and a stem unit to be separated from each other by die-forging the head unit; (S20) Form a ring-shaped groove along the surface edge of a sheet of the head unit; (S30) Form a weld region on the groove by overlay-welding circular beads to be arranged with multiple layers and by depositing Nickel alloy on the layers; (S40) Roll and process the weld region; (S50) Form a coating unit by coating a Nickel alloy on the bottom of the head unit after performing a spherical-processing and finishing |
