Process for intensifying ultrasonic vibration assisted electric spark pulse discharging surface

A technology of ultrasonic vibration and surface strengthening, which is applied in the field of surface treatment of materials, and can solve problems such as limited application and uneven distribution of strengthening layers

Inactive Publication Date: 2011-02-09
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Studies have shown that the microhardness, wear resistance and corrosion resistance of the strengthened workpiece surface have been greatly improved, but the strengthening layer is unevenly distributed on the workpiece surface, which greatly limits the application of this technology

Method used

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  • Process for intensifying ultrasonic vibration assisted electric spark pulse discharging surface
  • Process for intensifying ultrasonic vibration assisted electric spark pulse discharging surface
  • Process for intensifying ultrasonic vibration assisted electric spark pulse discharging surface

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Experimental program
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Effect test

Embodiment 1

[0022] The workpiece electrode is 65Mn steel tempered at medium temperature after quenching, and its original structure is tempered troostite, with a size of 100mm×12mm×0.5mm. The tool electrode is made of single crystal Si with a content of 99.999%, and the size is 12mm×12mm×20mm. The experimental machine tool is Beijing AgieCharmilles SF201 electric discharge precision forming machine tool, and the positive polarity electric spark surface strengthening is carried out on 65Mn steel in kerosene. The tool electrode is installed at the end of the ultrasonic horn of the ultrasonic generator, and is closely combined with the horn to ensure that it can resonate with the vibration frequency of the ultrasonic transducer. The ultrasonic generator, ultrasonic transducer, horn, and tool electrode form a mechanical resonance system. The ultrasonic transducer, horn and tool electrode are combined to form an ultrasonic vibration device installed on the spindle of the precision electric di...

Embodiment 2

[0024] The workpiece electrode is 65Mn steel tempered at medium temperature after quenching, and its original structure is tempered troostite, with a size of 100mm×12mm×0.5mm. The tool electrode is made of single crystal Si with a content of 99.999%, and the size is 12mm×12mm×20mm. The experimental machine tool is Beijing AgieCharmilles SF201 electric discharge precision forming machine tool, and the positive polarity electric spark surface strengthening is carried out on 65Mn steel in kerosene. The tool electrode is installed at the end of the ultrasonic horn of the ultrasonic generator, and is closely combined with the horn to ensure that it can resonate with the vibration frequency of the ultrasonic transducer. The ultrasonic generator, ultrasonic transducer, horn, and tool electrode form a mechanical resonance system. The ultrasonic transducer, horn and tool electrode are combined to form an ultrasonic vibration device installed on the spindle of the precision electric di...

Embodiment 3

[0026] The electric discharge machine tool is the SF201 precision electric discharge forming machine produced by Beijing AgieCharmilles. The ultrasonic generator is manufactured by Shanghai Ultrasonic Equipment Factory. The maximum output power is 150W and the maximum amplitude is 12μm. It can realize the output power and frequency. manual adjustment. The workpiece is made of 65Mn steel quenched and tempered at medium temperature, and the size is 100mm×12mm×0.5mm. The tool electrode is made of single crystal Si with a content of 99.999%, and the size is 12mm×12mm×20mm. The electrical parameters were set as follows: positive polarity processing, pulse width 4.2μs, pulse interval 18μs, peak current 5.6A, strengthening time 15min. The tool electrode is installed at the end of the ultrasonic horn and is closely combined with the horn to ensure that it can resonate with the vibration frequency of the ultrasonic transducer. The ultrasonic generator, ultrasonic transducer, horn and ...

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Abstract

The invention discloses a process for intensifying an ultrasonic vibration assisted electric spark pulse discharging surface, comprising the following steps of: selecting 65Mn steel subjected to medium temperature tempering treatment after quenching, as a workpiece electrode and a monocrystal Si as a tool electrode; additionally arranging an ultrasonic vibration device on the tool electrode to assist the electric spark surface intensification; and with coal oil as a working solution, carrying out positive electrode electric spark surface intensification on the 65Mn steel by utilizing an electric spark processing machine tool, wherein the intensifying electricity parameters are that the pulse width is more than or equal to 4.2 mu s and less than 7.5mu s, the pulse width intrapulse ratio is between 0.21 and 0.56, a peak value current is more than or equal to 3.2A and less than 14.2A, the intensifying time is between 15min and 25min, the tool electrode-assisted ultrasonic vibration amplitude range is between 1mu m and 2mu m, and the frequency range is between 15 kHz and 60kHz. The invention improves the surface topography of an intensified layer so that the thickness distribution of the intensified layer is more uniform and more compact, increases the quantity of an intensifying phase and improves microhardness, abrasive resistance and surface Si content of the intensified layer.

Description

technical field [0001] The invention relates to a material surface treatment process, in particular to an ultrasonic vibration-assisted electric spark pulse discharge surface strengthening process. Background technique [0002] The electric spark discharge surface strengthening technology based on the electric machining method is an important part of the surface strengthening technology. It has the advantages of simple equipment, easy operation, and low cost. It can be widely used in the surface strengthening of molds, tools and mechanical parts and the wear parts Repair, with a large application space. Scholars at home and abroad have conducted in-depth research on its strengthening process, selection of electrode materials and related theories. Studies have shown that the microhardness, wear resistance and corrosion resistance of the strengthened workpiece surface have been greatly improved, but the strengthening layer is unevenly distributed on the workpiece surface, whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/09C21D1/04
Inventor 董春杰张建华宋夕超张海宁
Owner SHANDONG UNIV
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