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Friction stir processing method for marine propeller

A marine propeller and friction stir technology, which is applied in friction stir processing and friction stir processing of marine propellers, can solve the problems of high process requirements and easy fracture, and achieve smooth workpiece surface, improved performance, and good apparent quality of weld seams Effect

Inactive Publication Date: 2017-10-31
ZHENJIANG TONGZHOU PROPELLER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The marine propellers in the prior art are mostly manufactured by casting. Since the thickness of the blades changes, the casting process is relatively strict. The blades are also relatively easy to break during use. If stainless steel is used for casting, the process more demanding

Method used

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  • Friction stir processing method for marine propeller

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A friction stir processing method for a marine propeller, comprising the steps of:

[0023] A. Select the nickel-aluminum bronze material to design the shape of the blade and blade cover according to the propeller;

[0024] B. Grinding and polishing the blade and blade cover;

[0025] C. Clamp and position the polished and polished blades and blade sleeves, and connect them into one body through friction stir welding. During friction stir welding, the rotating speed of the stirring head is 1220rpm; The heating temperature is 640°C, and the temperature is maintained until the end of processing; at the same time, cooling water with a temperature of -5°C is sprayed on the welding part of the blade and the blade sleeve, and ultrasonic waves are emitted to the blade and the blade sleeve. The power is 4000W, 50Khz.

Embodiment 2

[0027] A friction stir processing method for a marine propeller, comprising the steps of:

[0028] A. Select the nickel-aluminum bronze material to design the shape of the blade and blade cover according to the propeller;

[0029] B. Grinding and polishing the blade and blade cover;

[0030] C. Clamp and position the polished and polished blades and blade sleeves, and connect them into one body through friction stir welding. During friction stir welding, the rotating speed of the stirring head is 1100rpm; Heat the cover at a temperature of 560°C, and maintain this temperature until the end of processing; at the same time, spray cooling water with a temperature of -5°C on the welding joints of the paddle and the cover, and send out ultrasonic waves to the paddle and the cover. The power is 4000W, 50Khz.

Embodiment 3

[0032] A friction stir processing method for a marine propeller, comprising the steps of:

[0033] A. Select the nickel-aluminum bronze material to design the shape of the blade and blade cover according to the propeller;

[0034] B. Grinding and polishing the blade and blade cover;

[0035] C. Clamp and position the polished and polished blades and blade sleeves, and connect them into one body through friction stir welding. During friction stir welding, the rotating speed of the stirring head is 1180rpm; The heating temperature is 260°C, and the temperature is maintained until the end of processing; at the same time, cooling water with a temperature of -5°C is sprayed on the welding joints of the blade and the blade sleeve, and ultrasonic waves are emitted to the paddle blade and the blade sleeve. The power is 4000W, 50Khz.

[0036] To sum up, this processing technology makes the processed material undergo severe plastic deformation, mixing, and crushing through the strong ...

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Abstract

The invention discloses a friction stirring machining method of a marine propeller. The method comprises the following steps: firstly selecting a nickel aluminum bronze material to design the shape of paddles according to the propeller; then grinding and polishing the paddles; next clamping and positioning the ground and polished paddles and a paddle sleeve, and integrally connecting through a friction stirring welding process. The paddles and the paddle sleeve are heated in the friction stirring welding process, and cooling water is sprayed, so the fluidity and the plastic deformation capacity of the copper alloy material are improved, and the microstructure of the material is refined, homogenized and compacted; thus the performance of the marine propeller is greatly improved, the surface hardness of the propeller is improved by 20 percent, the yield performance of the material is improved by 50 percent, the tensile strength of the material is improved by 20 percent, and the elongation of the material is improved by 30 percent.

Description

technical field [0001] The invention relates to a friction stir processing method, in particular to a friction stir processing method for a marine propeller, and belongs to the technical field of marine propeller processing. Background technique [0002] my country has already become the world's largest shipbuilding country, and is developing into a shipbuilding power. At present, the total tonnage of my country's shipbuilding ranks first in the world. With the advent of the ocean age, the shipping industry is in an important stage of leapfrog development, requiring a large number of high-performance ships, and the requirements for the quality of ships and their parts are getting higher and higher. Therefore, the importance of the mechanical properties and cavitation resistance performance of propeller materials is becoming more and more obvious. During the propulsion process of the ship, the propeller continuously generates cavitation, and the negative pressure burst gene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/12B23K20/24B23K20/26B23K103/12
CPCB23K20/122B23K20/127B23K20/22B23K20/24B23K20/26B23K2103/12
Inventor 徐高峰陈志国梅斌贤宋佩学王湘来
Owner ZHENJIANG TONGZHOU PROPELLER
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