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Large ship propeller casting technology

A casting process and propeller technology, which is applied in the field of large-scale ship propeller casting technology, can solve the problems of low yield of propeller castings, pores and wrinkles in propeller castings, improve contour accuracy and surface quality, improve finished product qualification rate, and simple process easy to control effect

Inactive Publication Date: 2015-12-30
SUZHOU JINYE MARINE MACHINERY PLANT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large area and thin blades of ship propellers, defects such as pores and wrinkles often appear on the surface of propeller castings, which makes the yield of propeller castings low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A large ship propeller casting process, comprising the following steps:

[0019] 1) Sand mold making: use silica sand as the original sand, water glass as the binder, and harden it with carbon dioxide to make a sand mold;

[0020] 2) Set riser and cold iron: set two circular risers on the upper end of the sand mold, and place an external chill iron on the lower end of the sand mold near the thick part of the slurry hub;

[0021] 3) Melting and pouring: use a large-scale double furnace medium-frequency electric furnace to melt the nickel-aluminum-copper alloy ingot into a nickel-aluminum-copper alloy liquid, wherein the melting temperature is 1220°C, and then use the bottom pouring method to pour the nickel-aluminum-copper alloy liquid. After pouring is completed, the large ship propeller casting is obtained;

[0022] 4) Mold drying and cooling: After pouring, use an electric hot air furnace to dry the large ship propeller castings, and then heat preservation and coolin...

Embodiment 2

[0025] A large ship propeller casting process, comprising the following steps:

[0026] 1) Sand mold making: use silica sand as the original sand, water glass as the binder, and harden it with carbon dioxide to make a sand mold;

[0027] 2) Set riser and cold iron: set two circular risers on the upper end of the sand mold, and place an external chill iron on the lower end of the sand mold near the thick part of the slurry hub;

[0028] 3) Smelting and pouring: use a large-scale double furnace medium-frequency electric furnace to melt the nickel-aluminum-copper alloy ingot into a nickel-aluminum-copper alloy liquid, wherein the melting temperature is 1230°C, and then use the bottom pouring method to pour the nickel-aluminum-copper alloy liquid. After pouring is completed, the large ship propeller casting is obtained;

[0029] 4) Mold drying and cooling: After the pouring is completed, the large ship propeller casting is dried with an electric hot stove, and then the mold is re...

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PUM

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Abstract

The invention discloses a large ship propeller casting technology. The technology includes the first step of sand mold manufacturing, the second step of riser and chilling block arrangement, the third step of melting and pouring, the fourth step of cast drying and cooling and the fifth step of cleaning and riser gas cutting. In the step of riser and chilling block arrangement, two round open risers are arranged at the upper end of a sand mold, and an outer chilling block is placed on the portion, close to the thick and large part of a propeller hub, at the lower end of the sand mold. In the step of melting and pouring, a large double-furnace-body medium-frequency electric furnace is adopted so that a cast alloy ingot can be melted into cast alloy melt, then the cast alloy melt is poured in a bottom injection type pouring mode, and a large ship propeller casting is manufactured after pouring is completed. In the step of cast drying and cooling, after pouring is completed, the large ship propeller casting is dried through an electric hot air furnace, and then heat preservation, cooling and demolding are carried out. In the way, the technology is simple and easy to control, the blade outline precision and the surface quality of a propeller can be improved, the defect that pores, wrinkles and the like occur in the surface of the propeller is avoided, and accordingly the finished product yield of the large ship propeller is effectively increased.

Description

technical field [0001] The invention relates to the field of casting technology, in particular to a large ship propeller casting process. Background technique [0002] In recent years, with the vigorous development of the world's shipbuilding industry, the tonnage of shipbuilding has become larger and larger, and the weight of marine propellers has also continued to increase. As a key component of a ship's power system, the propeller is usually the heaviest part on a ship. [0003] Ship propeller blades are composed of complex curved surface shapes, and usually propellers are made of blanks by casting. However, due to the large area and thin blades of ship propellers, defects such as pores and wrinkles often appear on the surface of propeller castings, which makes the yield of propeller castings low. Contents of the invention [0004] The main technical problem to be solved by the present invention is to provide a large-scale ship propeller casting process, which is simp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/22B22C9/02
Inventor 汤建明
Owner SUZHOU JINYE MARINE MACHINERY PLANT
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