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Method for improving metal solidification structure through multi-dimensional mechanical vibration

A technology of mechanical vibration and metal solidification, which is applied in the field of improving metal solidification structure by using multi-dimensional mechanical vibration, which can solve problems such as coarse grains, inclusions, loose shrinkage cavity segregation, etc., to expand equiaxed crystal regions, eliminate segregation, and control columnar crystals. The effect of growth

Active Publication Date: 2018-06-29
江苏环宇冶金科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for improving the metal solidification structure by using multi-dimensional mechanical vibration, so as to solve the defect problems such as coarse crystal grains, large-size precipitates, inclusions, loose shrinkage cavity segregation, etc. existing in the current control of metal solidification structure

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  • Method for improving metal solidification structure through multi-dimensional mechanical vibration
  • Method for improving metal solidification structure through multi-dimensional mechanical vibration
  • Method for improving metal solidification structure through multi-dimensional mechanical vibration

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Example 1: Solidification of Aluminum Alloy

[0030] The experimental process is as follows:

[0031] Melt preparation: 1kg of 6063 aluminum alloy, 99.7wt% melted at 720°C;

[0032] Metal forming mold: Electrode graphite material, baked to 400°C, the size of the graphite mold is Φ160×150mm;

[0033] Solidification process:

[0034] After the aluminum alloy melt is degassed, when the temperature drops to 700°C, the aluminum alloy melt is cast into the metal forming mold 3, and the vibration is started after pouring.

[0035] In the present embodiment, the elastic coefficients of the eight elastic steel wires of the fixed metal forming die 3 are exactly the same, and the vibration dimension of the metal forming die 3 is three-dimensional, and the vibration frequency in each dimension direction is all at 900Hz. The vibration amplitudes are all 5 microns.

[0036] After solidification completely, close the first vibration motor 4 and the second vibration motor 5.

[00...

Embodiment 2

[0041] Embodiment 2: Solidification of AZ91 magnesium alloy in copper mold

[0042] The experimental process is as follows:

[0043] Metal forming mold: copper casting mold, the size is Φ280×250mm;

[0044] Solidification process:

[0045] After the magnesium alloy melt is degassed, when the temperature drops to 600° C., the aluminum alloy melt is cast into the metal forming mold 3 , and the vibration is started after pouring.

[0046] In this embodiment, the elastic coefficients of the eight elastic steel wires that fix the metal forming die 3 are not completely the same, and due to the different resonance frequencies, the vibration dimension of the metal forming die 3 is more than three-dimensional, and the vibration frequency in each dimension is 800 Hz , with a vibration amplitude of 10 microns in each dimension.

[0047] After solidification completely, close the first vibration motor 4 and the second vibration motor 5.

[0048] After cooling, the section of the sampl...

Embodiment 3

[0053] Example 3: Solidification of steel

[0054] Melt preparation: 1kg of 40Cr alloy steel was melted at 1580°C.

[0055] Metal forming mold: inside a sand mold with a size of Φ280×250mm, protected by a graphite mold.

[0056] Solidification process:

[0057] After the molten steel is refined, when the temperature drops to 1520°C, it is poured into the metal forming mold 3, and the vibration is started after pouring.

[0058] In this embodiment, the coefficients of elasticity of the eight elastic steel wires that fix the metal forming die 3 are not completely the same. Due to the different resonance frequencies, the vibration dimension of the metal forming die 3 is more than three-dimensional, and the vibration frequency in each dimension is 100 Hz. , with a vibration amplitude of 2 microns in each dimension.

[0059] After solidifying completely, close vibration excitation motor 4 and vibration excitation motor 5.

[0060] After cooling, the cross-section of the sample ...

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Abstract

The invention provides a method for improving a metal solidification structure through multi-dimensional mechanical vibration, and belongs to the technical field of metal solidification control. The method is mainly characterized in that molten metal and a casting mold generate multi-dimensional high-frequency micro-amplitude vibration during the solidification process of metal melt, the solidification structure of metal is improved, and the comprehensive performance of a metal casting is improved. According to the method, the crystal grains and the precipitation phase in the solidification structure of the metal can be simultaneously refined, and the large-size inclusions, pores, looseness and the like in a casting can be reduced; and in addition, the method does not pollute the metal, and is wide in applicability, simple in equipment and low in cost.

Description

technical field [0001] The invention relates to the field of metal solidification, in particular to a method for improving metal solidification structure by using multi-dimensional mechanical vibration. Background technique [0002] The solidification structure of metal materials has a decisive impact on the properties of materials. Improving the solidification structure of metal materials is regarded as one of the most important means to improve material performance; the current solidification structure defects of metal materials mainly include: coarse grains and precipitated phases, equiaxed The scope of the crystal region is small and the columnar crystals are too developed, large inclusions of slag and pores are loose; these solidification structure defects become the main cause of reducing the performance of the material. Therefore, in order to improve the performance of the material, efforts must be made to improve the solidification structure of the material. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D27/08
CPCB22D27/08
Inventor 王宏明李桂荣赵玉涛
Owner 江苏环宇冶金科技有限公司