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Thermal treatment process for propeller shaft

A technology for propeller shafts and propellers, which is applied in the field of heat treatment of propeller shafts, can solve problems such as corrosion, and achieve the effects of improving sealing performance, enhancing hardness and strength, and ensuring sealing performance.

Inactive Publication Date: 2020-05-12
杭州大路金属热处理有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The above-mentioned existing technical solutions have the following defects: the propellers used for ships have serious corrosion problems due to long-term immersion in seawater and being surrounded by waves and a large amount of seawater splashing and mist

Method used

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Embodiment Construction

[0033] The present invention will be described in further detail below.

[0034] A heat treatment process for a propeller shaft, comprising the steps of:

[0035] Step S1, quenching, heating the propeller to 500°C in a solid solution box and keeping it warm for 30 minutes;

[0036] Step S2, cooling, the heated workpiece is rapidly cooled, and the propeller is rapidly cooled at a high temperature, which can increase the hardness and strength of the propeller; and when cooling here, quickly put the high-temperature propeller into cold water, and simultaneously pass it Nitrogen;

[0037] Step S3, tempering, reheating the propeller to 200°C through an intermediate frequency furnace;

[0038] Step S4, homogenizing annealing, the propeller is cooled in the intermediate frequency furnace, and the propeller is taken out after the propeller is cooled to 40-50°C;

[0039] Step S5, anti-corrosion treatment. When the propeller is taken out and cooled to 25-35°C in the air, the blade is...

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Abstract

The invention relates to a thermal treatment process for a propeller shaft. The thermal treatment process comprises the following steps: S1, quenching is conducted, specifically, a propeller is placedin a solid solution box to be heated to reach 500 DEG C and subjected to heat preservation for 30 min; S2, cooling is conducted, specifically, a heated workpiece is cooled quickly; S3, tempering is conducted, specifically, the propeller is reheated to reach 200 DEG C through an intermediate frequency furnace; S4, homogenizing annealing is conducted, specifically, the propeller is subjected to furnace cooling in the intermediate frequency furnace, and taken out after cooled to reach 40-50 DEG C; S5, anti-corrosion treatment is conducted, specifically, when the propeller is taken out and cooledto reach 25-35 DEG C in air, the surfaces of blades are coated with aliphatic polyurethane; and S6, the surface of a propeller hub is plated with chromium, the propeller is reheated, and when the temperature of the propeller is increased to 40-45 DEG C, the surface of the propeller hub is coated with high-performance anti-corrosion coating. The thermal treatment process has the effect of improving anti-corrosion performance of the propeller.

Description

technical field [0001] The invention relates to the technical field of metal heat treatment, in particular to a heat treatment process for a propeller shaft. Background technique [0002] With the continuous development of China's transportation industry, propellers, as the propellers of aircraft and ships, have attracted the attention of various countries. The working conditions of propellers have high requirements for their own materials. The research and development of performance materials never stops. [0003] The Chinese patent with the publication number CN108914003A discloses a heat treatment method that can improve the mechanical properties of the carbon-manganese steel propeller shaft dagger. First, the carbon-manganese steel propeller shaft forging that meets the requirements of the melting analysis chemical composition is heated to 600-650°C for heat preservation, and then Heat up to 840-860°C and then keep it warm, then quench and cool it with water cooling, ai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D1/26C21D9/28C25D11/34C09D175/04C09D5/08
CPCC09D5/08C09D175/04C21D1/18C21D1/26C21D9/28C25D11/34
Inventor 费张兴
Owner 杭州大路金属热处理有限公司
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