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A surface grinding and finishing method for nuclear power pump valves

A technology for nuclear power pump valves and finishing processing, applied in metal processing equipment, abrasives, manufacturing tools, etc., can solve problems such as high cost, complicated process, and numerous procedures, achieve high-efficiency mass production and processing, and improve processing efficiency , high precision effect

Active Publication Date: 2015-08-19
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this treatment method can achieve the effect of high-clean ultra-high-purity stainless steel surface treatment, it has many procedures, complicated process, high cost, and lack of high-efficiency surface polishing steps, so it cannot meet the requirements of high-efficiency and mass-processing. Cannot handle larger workpieces such as pump bodies and valve bodies

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Utilize the method of the present invention to polish the surface of the austenitic stainless steel nuclear main pump body used in a certain nuclear power plant, and the steps are as follows:

[0024]The first step is to use a martensitic stainless steel high-strength steel wire wheel with a steel wire diameter of 0.3-0.5mm and a hardness of 50HRC to roughly grind the surface of the pump body to be processed. The grinding speed of the steel wire wheel is 25-40m / s, and the surface removal depth is 200-300μm , During the cleaning process, it is necessary to swing the steel wire wheel quickly and ensure that the contact pressure between the steel wire wheel and the surface of the pump body is as small as possible to prevent the surface of the pump body from overheating and crack defects, which will affect the surface quality;

[0025] In the second step, the metallographic abrasive cloth wheel with a particle size range of 180-400 mesh is used to fine-grind the surface of t...

Embodiment 2

[0030] Using the method of the present invention to polish and finish the surface of the valve body of the austenitic stainless steel primary valve used in a nuclear power plant, the steps are as follows:

[0031] The first step is to use a martensitic stainless steel high-strength steel wire wheel with a wire diameter of 0.3-0.5mm and a hardness of 50HRC to perform rough grinding on the surface of the valve body to be processed. The grinding speed of the wire wheel is 25-40m / s, and the surface removal depth is 200-300μm , During the cleaning process, it is necessary to swing the steel wire wheel quickly and ensure that the contact pressure between the steel wire wheel and the valve body is as small as possible to prevent the surface of the valve body from overheating and crack defects, which will affect the surface quality;

[0032] In the second step, use a metallographic abrasive cloth wheel with a particle size range of 180-400 mesh to finely grind the surface of the valve ...

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Abstract

The invention provides a machining method for a nuclear power pump valve surface through polishing and finishing, and belongs to the technical field of material surface machining. The method includes the following steps that rough grinding is carried out on the surface to be processed of a nuclear power pump valve by means of a steel wire wheel; an abrasive cloth wheel is adopted to carry out accurate grinding on the nuclear power pump valve surface; finishing machining is conducted on the nuclear power pump valve surface through a polishing wheel; a spraying method is adopted to clean the nuclear power pump valve surface; the nuclear power pump valve surface is dried through compressed air. The method is low in cost and time consuming, machining efficiency of the nuclear power pump valve surface can be significantly improved, and production and machining with high efficiency on a large scale are achieved; surface roughness of a machined nuclear power pump valve is high in precision, no pollutants such as oxide or out-phase tissues exist, the precision of the surface roughness completely accords with regulation on surface quality of nuclear power equipment in ASME and ASTM standards, and the fact that the nuclear power pump valve can be normally used without losing efficacy and being damaged is guaranteed. The machining method can be widely applied to the five steps of the nuclear power pump valve surface, the compressed air is adopted to blow and sweep the surface of a valve body, and the surface is dry and clean after being cleaned.

Description

technical field [0001] The invention relates to a method for grinding and finishing the surface of a nuclear power pump valve, belonging to the technical field of material surface processing. technical background [0002] In the primary, secondary, and tertiary circuits of nuclear power plants and other nuclear and non-nuclear auxiliary systems, nuclear pumps including nuclear primary, secondary, and tertiary pumps are the core cycle power systems. For example, the reactor coolant pump of the first circuit, that is, the nuclear main pump, high and low pressure safety pumps, and top charging pumps; the main feed water pump and condensate water pump of the secondary circuit condensate water system; the circulating cooling pump of the three-circuit circulating cooling water system, nuclear and non-nuclear Containment spray pumps, auxiliary water feed pumps, equipment cooling water pumps, waste liquid delivery pumps, nuclear island important water pumps, conventional island cool...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B24B1/00B24D13/00B24D11/00
Inventor 雷明凯朱小鹏李昱鹏郑博聪佟硕
Owner DALIAN UNIV OF TECH
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