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Claw assembly with long service life and production process thereof

A manufacturing process and long-life technology, applied in the field of nuclear reactor control system components and component manufacturing, can solve problems such as unsatisfactory service life, and achieve the effects of high spray welding speed, large selection of alloys, and precise dimensions

Inactive Publication Date: 2015-07-01
SICHUAN HUADU NUCLEAR EQUIP MFR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Taking the 60-year design life of the hook assembly as an example, it needs to be greatly increased to more than 20 million steps. However, the service life of the hook assembly of the second-generation and third-generation PWR control rod drive mechanisms currently in operation cannot meet the requirements. The problem of this requirement, the present invention provides a kind of long-life claw assembly and its manufacturing process

Method used

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  • Claw assembly with long service life and production process thereof
  • Claw assembly with long service life and production process thereof
  • Claw assembly with long service life and production process thereof

Examples

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Embodiment 1

[0038] Such as Figure 1 to Figure 4 As shown, a manufacturing process of a long-life claw assembly for the manufacture of parts with friction between the claw assembly of the nuclear reactor control rod drive mechanism during operation, including sequential blanking, rough machining and surface The step of processing the wear-resistant layer, the blanking step is to process the blanks of each part according to the design requirements;

[0039] The step of processing the wear-resistant layer on the surface is spray-welding the wear-resistant layer on the surface of each blank, wherein the spray-welding wear-resistant layer includes the following steps carried out in sequence:

[0040] A. Preheating, the preheating is heating each blank to 300-400°C;

[0041] B. Powder spraying and remelting. The powder spraying is carried out with an oxyacetylene flame. The powder spraying includes a solder powder spraying process and a heat melting process with at least one frequency and the...

Embodiment 2

[0061] The present embodiment is further limited on the basis of embodiment 1, as Figure 1 to Figure 5 As shown, as a further implementation of Example 1, the heat source used in the remelting step is an oxyacetylene flame, and the oxyacetylene flame used in the remelting step is a neutral flame, a weak carbonization flame or a carbonization flame, and the oxyacetylene The ratio of the length of the flame core to the inner flame is between 1:1 and 1:2. In this embodiment, the length ratio between the flame core and the inner flame of the oxyacetylene flame is limited between 1:1 and 1:2. The reason is the same as that in Embodiment 1. In fact, it is to limit the mixing ratio of oxygen and acetylene as combustion gases. .

[0062] In the remelting step, the included angle between the oxygen acetylene flame and the surface of the cladding layer used in the remelting step ranges from 60° to 75°. In the process of spraying and welding the wear-resistant layer, the two-step meth...

Embodiment 3

[0070] The present embodiment is further limited on the basis of embodiment 1, as figure 1 As shown, this embodiment provides a preferred manufacturing process route of the claw assembly, and the prerequisite detection is carried out before blanking; the steps of rough machining and surface machining of the wear-resistant layer include cleaning and marking steps; pre-welding steps are carried out before the preheating step For non-destructive testing, the cooling step is thermal insulation cooling. The subsequent cooling step also includes post-welding non-destructive testing, machining, non-destructive testing after machining, finished dimension inspection, part cleaning and marking, and storage.

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Abstract

The invention discloses a claw assembly with long service life and a production process thereof, which are used for manufacturing parts with mutual friction in an operation process of the claw assembly of a nuclear reactor control rod driving mechanism. The process comprises the following steps which are carried out in sequence: discharging, roughly machining and machining a wear-resisting layer on the surface. The step of discharging is to machine blanks of all parts according to design requirements; the step of machining the wear-resisting layer on the surface is to spray and weld the wear-resisting layer on the surface of each blank; and the step of spraying and welding the wear-resisting layer comprises the following steps which are carried out in sequence: pre-heating, spraying powder and re-melting, and cooling. In the claw assembly disclosed by the invention, the sprayed and welded wear-resisting layer or the surfaced wear-resisting layer is arranged on the surface of each part with the friction in the operation process. The invention provides the claw assembly with the long service life and a corresponding manufacturing process, and the obtained claw assembly meets the requirements on the wear resistance under a high-frequency working condition within a 60-year service period.

Description

technical field [0001] The invention relates to the field of nuclear reactor control system components and component manufacturing, in particular to a long-life claw component and a manufacturing process thereof. Background technique [0002] The pressurized water reactor control rod drive mechanism is installed on the top cover of the reactor pressure vessel, which can drive the control rod assembly to move up and down in the core or quickly insert the core according to the instructions, and complete the start-up, power adjustment, power maintenance, and normal shutdown of the reactor. And emergency shutdown and other functions. At the same time, the claw assembly of the control rod drive mechanism is an action execution part to complete the above instructions, and is a vulnerable part of the control rod drive mechanism. [0003] At present, the second-generation (including the second-generation improved) pressurized water reactor nuclear power plants in service in the wor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C21/18G21C7/14
CPCG21C7/14G21C21/18Y02E30/30
Inventor 李泽文刘霞贺小刚
Owner SICHUAN HUADU NUCLEAR EQUIP MFR
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