A method of manufacturing a propeller for a ship

Abstract

The invention discloses a method for manufacturing a ship propeller. The method comprises the following steps of molding a blade part casting and a shaft hub part casting through stainless steel alloy casting, respectively; washing the surfaces of the blade part casting and the shaft hub part casting to remove greases and impurities on the surfaces; performing ultrasonic cleaning on the surfaces of the blade part casting and the shaft hub part casting; drying the surfaces of the blade part casting and the shaft hub part casting for the future use; performing electrolytic grinding on the cleaned blade part casting and the cleaned shaft hub part casting; performing passivation on the ground blade part casting and the ground shaft hub part casting for three times; precisely cleaning, drying and coloring the blade part casting and the shaft hub part casting after the blade part casting and the shaft hub part casting are dried; performing thermal spraying treatment on the blade part casting and the shaft hub part casting in two steps; finally welding and molding the blade part casting and the shaft hub part casting after the thermal spraying treatment is performed on the blade part casting and the shaft hub part casting; and slowly cooling the blade part casting and the shaft hub part casting to a room temperature. The method for manufacturing the ship propeller, disclosed by the invention, is advantaged in that the method is simple to operate and convenient to implement; and the mechanical strength and plasticity of the propeller can be obviously improved.

Description

technical field [0001] The invention relates to a manufacturing method of a ship machine tool. More specifically, the present invention relates to a method of manufacturing a ship propeller. Background technique [0002] The propeller is the main propulsion part of the ship. Its applicability, safety and reliability, and durability are closely related to the material. It has been more than 160 years since the propeller was used as the propeller of the ship. During this period, the propeller material has experienced cast iron, different cast Steel, ordinary brass, high-strength brass, nickel-aluminum bronze and other different development stages, it marks the type of propeller material has changed from singleness to diversity, and the performance of materials has developed from low-level to high-level, especially nickel-aluminum bronze, It has always been the main material of ship propellers, but with the development of large-scale and high-speed ships, the loads on the prop...

AI Technical Summary

Problems solved by technology

[0002] The propeller is the main propulsion part of the ship. Its applicability, safety and reliability, and durability are closely related to the material. It has been more than 160 years since the propeller was used as the propeller of the ship. During this period, the propeller material has experienced cast iron, different cast Steel, ordinary brass, high-strength brass, nickel-aluminum bronze and other different development stages, it marks the type of propeller material has changed from singleness to diversity, and the performance of materials has developed from low-level to high-level, especially nickel-aluminum bronze, It has always been the main material of ship propellers, but with the development of large-scale and high-speed ships, the loads on the propellers are heavier. In addition, due to the pollution of the water environment, the corrosion of the propellers is intensified. These factors lead to existing materials such as Potential disadvantages of nickel-aluminum bronze: low tensile strength (up to 800MPa), decomposition (dezincification, dealuminization) corrosion, stress corrosion, and poor erosion corrosion resistance at high flow rates (2m / s) , the shortcomings of low corrosion resistance to polluted seawater are exposed

[0004] With the increasing size of propellers, the one-time casting process is difficult and the controllability is low, and the casting cooling rate is too fast, and the strength and plasticity of the propellers are obviously reduced by using the separate casting and welding combination process. trend