Frequency spectrum harmonic wave treatment method for improving dimensional stability of aluminum matrix composite

An aluminum matrix composite material and dimensional stability technology, applied in the field of metal matrix composite materials, can solve the problems of reducing material dimensional stability, low efficiency, long construction period, etc., and achieve a significant reduction in residual stress, low energy consumption, and low cost. Effect

Inactive Publication Date: 2014-02-26
NORTH CHINA UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main dimensional stabilization treatment method for high-volume SiCp / Al composite materials is the thermal aging method. Different thermal aging temperatures and times will affect the dimensional stability of the material, and improper treatment methods will also reduce the dimensional stability of the material. , and the common thermal aging treatment method still has disadvantages such as high energy consumption, high emission, high cost, low efficiency, and long construction period, so it is a high-body The key to popularize and even large-scale application of SiCp / Al composite materials in precision instruments and meters

Method used

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  • Frequency spectrum harmonic wave treatment method for improving dimensional stability of aluminum matrix composite
  • Frequency spectrum harmonic wave treatment method for improving dimensional stability of aluminum matrix composite
  • Frequency spectrum harmonic wave treatment method for improving dimensional stability of aluminum matrix composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The material selected in this example is a high-volume SiCp / Al (55%) composite material, the SiC particles of the reinforcement are evenly distributed in the Al matrix, and the sample is a rod with a diameter of 5 mm and a length of 25 mm.

[0030] Specific implementation method: First, carry out spectral harmonic aging treatment on a batch of samples. Specific processing steps: In the first step, select an exciter with an exciting force of 65KN, and fix the sample on a vibration exciter equipped with the exciter. on the platform. The second step is to find five optimal excitation frequencies and two alternative excitation frequencies through Fourier analysis. The vibration speeds are: 4048rpm, 4278rpm, 4408rpm, 4575rpm, 4720rpm, 4905rpm, 5134rpm. In the third step, the vibration time is 18 min, 16 min, 16 min, 14 min, 14 min, 14 min, and 12 min in sequence, and vibration treatment is performed. Another batch of samples used for comparison was not treated; secondly, th...

Embodiment 2

[0032] The material selected in this example is a high-volume SiCp / Al (45%) composite material, and the reinforcement SiC is evenly distributed in the Al matrix. For the experimental parts, see Figure 4 , Figure 5 .

Embodiment approach

[0033] Specific implementation method: first, in the part Figure 4 Select 7 points evenly distributed on the surface, and measure their residual stress; secondly, carry out harmonic aging treatment on the parts. On the vibrating platform equipped with the exciter. The second step is to find five optimal excitation frequencies and two alternative excitation frequencies through Fourier analysis. The vibration speeds are: 3000rpm, 3298rpm, 3487rpm, 3613rpm, 3852rpm, 3996rpm, 4207rpm. In the third step, the vibration time is 22min, 20min, 20min, 18min, 18min, 16min, and 16min in turn, and the vibration treatment is performed; again, the residual stress of the 7 points selected above is measured at the same position. The specific experimental data are shown in Table 1; finally, according to the data in Table 1, Figure 6 ,pass Figure 6 We can see that after spectral harmonic aging treatment, the purpose of reducing the peak residual stress and homogenizing residual stress of t...

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Abstract

The invention belongs to the field of metal matrix composite, and relates to a frequency spectrum harmonic wave treatment method for improving dimensional stability of an aluminum matrix composite. The method is characterized by comprising the following steps of carrying out frequency spectrum analysis on the aluminum matrix composite through a Fourier analysis method so as to optimize five harmonic frequencies with best effect and two alternative harmonic frequencies, applying proper energy for treatment during a proper time according to five harmonic frequencies in sequence, if resonant frequency occurs, tripping the resonant frequency to treat the next frequency, and overlapping multi-direction dynamic stresses generated by vibration and residual stress in multidimensional allocation so as to cause plastic deformation, so that the purposes of lowering peak residual stress and homogenized residual stress and improving dimensional stability are realized. According to the method, the defects of low efficiency, long days for manufacturing, large energy consumption, and high cost of the traditional thermal aging treatment are overcome sharply, and the equipment occupies small area, is light in weight, is easy to carry, and is not limited by volume of workpieces.

Description

technical field [0001] The invention belongs to the field of metal-based composite materials and relates to a spectrum harmonic processing method for improving the dimensional stability of aluminum-based composite materials. technical background [0002] The aluminum-based composite material involved in the present invention is a high-volume silicon carbide particle / aluminum-based (abbreviated as SiCp / Al) composite material, which has high specific stiffness, specific strength, elastic modulus, wear resistance, and low thermal expansion coefficient Excellent mechanical and physical properties such as high thermal conductivity and low manufacturing cost, its performance has obvious advantages compared with traditional aluminum alloys, titanium alloys and carbon steels (the specific modulus can reach three times that of aluminum alloys, and the thermal expansion coefficient is insufficient 40% of the aluminum alloy, 38% of the density of carbon steel, and nearly 40 times of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/04
Inventor 崔岩王理华刘书奎
Owner NORTH CHINA UNIVERSITY OF TECHNOLOGY
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