Ultrasonic surface rolling process nanoparticlization method and apparatus

A nanometerization and ultrasonic technology, applied in the field of metal surface treatment, can solve the problems of easy wear of the working head, low life, and the improvement of the service life can not meet the practical requirements of long-term continuous work, so as to improve the comprehensive mechanical properties and improve the The effect of service life

Inactive Publication Date: 2008-07-16
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the processing method of fixing the working head, that is, the working head is rigidly connected with the output end of the horn, makes the working head and the surface of the mechanical parts in a sliding friction mode during the processing, which makes the working head extremely easy to wear and shorten the life. Very low fatal flaw
Even if the working head is made of hard alloy materials, the improvement of the service life still cannot meet the practical requirements of long-term continuous work

Method used

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  • Ultrasonic surface rolling process nanoparticlization method and apparatus
  • Ultrasonic surface rolling process nanoparticlization method and apparatus
  • Ultrasonic surface rolling process nanoparticlization method and apparatus

Examples

Experimental program
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Effect test

Embodiment 1

[0039] The quenched and tempered 40Cr shaft with a diameter of 60mm is surface-treated by ultrasonic surface rolling nano-processing method. The main technical parameters are as follows:

[0040] The spindle speed of the machine tool is 255r / min; the feed rate of the working head of the impact gun is 0.07mm / r; the static pressure is 400N; the processing is 15 times; the emulsified coolant is used as the lubricant; the working head is made of hard alloy material, and the spherical radius is 5mm; The ultrasonic amplitude at the output of the working head is 10 microns.

[0041] Experimental results: As shown in Figures 4 to 6, an amorphous nanocrystalline layer of nearly 100 microns was formed on the surface of the sample after USRP processing. The grains on the outermost surface are equiaxed, with an average grain size of about 3-7nm, which is about 2000 times finer than the original grain size (about 10μm); the hardness of the treated sample increases significantly, compared w...

Embodiment 2

[0043] The R-arc workpiece of 45 steel, as shown in Figure 2, is surface treated by ultrasonic surface rolling nano-processing method. The main technical parameters are as follows:

[0044] The spindle speed of the machine tool is 225r / min; the axial feed of the working head of the impact gun is 0.07mm / r, the longitudinal feed of the R arc is 0.01mm / r, the fixture deflection is 30°; the static pressure is 150N; The emulsified cooling liquid is used as the lubricating liquid; the working head is made of hard alloy material, and the spherical radius is 5mm; the ultrasonic amplitude at the output end of the working head is 10 microns.

[0045] Experimental results: the grains on the outermost surface are equiaxed, with an average grain size of about 7nm, as shown in Figures 7 and 8; the surface roughness is Ra 0.11.

Embodiment 3

[0047] The ZLD201A cast aluminum shaft with a diameter of 60mm is surface treated by ultrasonic surface rolling nano-processing method. The main technical parameters are as follows:

[0048] The spindle speed of the machine tool is 405r / min; the feed rate of the working head of the impact gun is 0.25mm / r; the static pressure is 50N; the machining goes back and forth 3 times; the emulsified coolant is used as the lubricant; the working head is made of hard alloy material, and the spherical radius is 5mm; the ultrasonic amplitude at the output end of the working head is 10 microns.

[0049] Experimental results: the grains on the outermost surface are equiaxed, the average grain size is about 7nm, as shown in Figures 9 and 10, and the surface roughness Ra is 0.65.

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Abstract

The invention provides an ultrasonic surface rolling process nanostructure device and method, belonging to the mental surface process technical field, which comprises an ultrasonic generator and an executive mechanism. The executive mechanism consists of an ultrasonic transducer, an ultrasonic horn and an ultrasonic working joint, which is characterized in that the ultrasonic working joint is a rolling ball body. The method includes two steps: (1) the choice of the parameters is that the rotary speed of the Machine Tool Spindle is 200r to 700r per min; the axial direction feeding quantity of the working joint is 0.02mm to 0.1mm per r; the static pressure of the executive mechanism is 50N to 500N; the output terminal swing of the working joint is 5mm to 25 mm; (2) the reciprocating process is 2 times to 15 times. By adopting the device to carry out the nanostructure, the working life of the working joint can be prolonged and the crystal fineness of the same depth from the area closer to the surface is ensured to be more strict and even, thus obtaining the ideal surface finish. The surface can form noncrystalline nanometer crystal layer of about 100 mm depth.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and relates to a nanometerization method and device for ultrasonic surface rolling processing. Background technique [0002] Mechanical components and structures are widely used in important fields such as ships, pressure vessels, vehicles, bridges, marine engineering, engineering machinery, aerospace, electric power, metallurgy, etc. However, these important mechanical structures and components are often damaged due to fatigue, creep, corrosion , brittle fracture, wear and other problems cause premature failure, among which fatigue damage, wear and corrosion problems are more common. For example, due to the speed increase, the fatigue problem of mechanical parts has become an important damage mechanism affecting the safety of railway traffic and the service life of rails; another example is the problem of contact fatigue damage of cold rolls in steel rolling equipment has not bee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D7/04
Inventor 王东坡刘刚王婷邓彩艳吴良晨龚宝明尹丹青宋宁霞
Owner TIANJIN UNIV
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