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

An electric spark and hole forming technology, applied in the field of EDM, to reduce the risk of tap breakage, reduce taper, and improve the effect of scouring

Active Publication Date: 2012-10-10
QINSHAN NUCLEAR POWER
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  • Abstract
  • Description
  • Claims
  • 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

[0073] The present invention will be further described below in conjunction with the drawings and specific embodiments:

[0074] Take the underwater EDM forming of the M20 threaded bottom hole on the outer wall of the underwater nuclear reactor basket as an example, the M20 threaded bottom hole needs to be machined on the outer wall of the basket, such as figure 1 As shown, two-pass roughing and two-pass finishing are used for forming, and the specific implementation process is as follows:

[0075] Step 1. Since the processing is carried out in boron-containing water, first turn on the underwater vacuum cleaner, if necessary, start the water circulation system of the power plant to absorb impurities that may affect the processing, and make the water clear enough for EDM; at the same time, it is necessary to monitor the conductivity of the boron-containing water The conductivity is maintained at 4~7μS / cm(25℃);

[0076] Step 2. Install the rough-machined electrode; the electrode materi...

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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 parametersand 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 spark processing, and particularly relates to a method for forming high-precision holes of underwater electric sparks in a high radiation environment. Background technique [0002] Electrical Discharge Machining (EDM) is a process that uses the local high temperature generated by pulse discharge to quickly melt and vaporize the material to be processed, 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, the radioactive equipment is formed with threaded bottom holes, positioning pin holes or other shapes. In order to shield radioactivity, long-distance underwater EDM processing methods are usually used. The demineralized water used by nuclear power plants to shield radioactivity contains a certain concentration (2400ppm) of boric acid. EDM must be carried out in such boron-containing w...

Claims

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Application Information

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Patent Type & Authority Patents(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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