Underwater high-precision hole forming method based on electrical discharge machining

A technology of electric discharge and hole forming, applied in the field of electric discharge machining

Active Publication Date: 2011-06-29
QINSHAN NUCLEAR POWER
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  • Abstract
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  • Application Information

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Problems solved by technology

After reviewing a large amount of literature, there is no good method to solve similar field engineering problems in China at present

Method used

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  • Underwater high-precision hole forming method based on electrical discharge machining
  • Underwater high-precision hole forming method based on electrical discharge machining
  • Underwater high-precision hole forming method based on electrical discharge machining

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Embodiment Construction

[0055] The present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

[0056] Taking the underwater EDM processing of the M20 threaded bottom hole on the outer wall of the underwater nuclear reactor basket as an example, it is necessary to process the M20 threaded bottom hole on the outer wall of the hanging basket, such as figure 1 As shown, two-pass roughing and two-pass finishing are used for forming, and the specific realization process is as follows:

[0057] Step 1. Since the processing is carried out in boron-containing water, first turn on the underwater vacuum cleaner, and if necessary, start the water circulation system of the power plant to absorb impurities that may affect the processing, so that the water quality is clear enough for EDM; at the same time, it is necessary to monitor the conductivity of the boron-containing water Rate, conductivity maintained at 4 ~ 7μS / cm (25 ℃);

[0058] Step 2. Install th...

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Abstract

The invention belongs to the technical field of electrical discharge machining, in particular to an underwater high-precision hole forming method based on electrical discharge machining, and aims to provide a method for forming a high-precision hole underwater under high irradiation conditions by electrical discharge machining, which can meet both requirements of the processing precision and processing speed. The method comprises the following steps: adjusting the process environment, setting rough processing parameters, performing rough processing twice, setting fine processing parameters, and performing fine processing twice. The invention has the advantages that: the rapid and high-precision hole processing is achieved by adopting the optimized electrical discharge machining parameters and the special design of the electrode scour hole, performing the rough processing twice and performing the fine processing twice. The processing depth of the threaded bottom hole is ensured, the degree of taper of the threaded bottom hole is reduced, and the risk that the screw tap is broken during the long-distance underwater tapping process is reduced. The smoothness of the processed surface is improved and a certain over-cut amount is provided, so that the processed threaded bottom hole can fully meet the requirement for engineering applications. The working current is increased to increase the speed of the electrical discharge machining.

Description

technical field [0001] The invention belongs to the technical field of electric discharge machining, and in particular relates to a method for forming high-precision holes by electric discharge under water in a high-radiation environment. Background technique [0002] Electrical Discharge Machining (EDM) is a process method that uses the local high temperature generated by pulse discharge to quickly melt and gasify the processed material, so as to remove the material and process it. It is the most widely used special processing method. one. [0003] In the high-radiation environment of nuclear power plants, threaded bottom holes, positioning pin holes or other shapes are formed on radioactive equipment. In order to shield radioactivity, long-distance underwater EDM is usually used. The desalted water used by nuclear power plants to shield radioactivity contains a certain concentration (2400ppm) of boric acid, and EDM must be performed in such boron-containing water. The de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23H9/14B23H1/00
Inventor 马明泽陈梁何少华戚宏昶欧卫兵
Owner QINSHAN NUCLEAR POWER
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