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Lost foam casting vibration clotting method

A technology of lost foam casting and vibrating table, which is applied in the field of precision casting, can solve the problems of mold damage and expensive equipment, and achieve the effects of improving casting performance, low cost and obvious refinement effect

Inactive Publication Date: 2008-05-21
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method of vibratory solidification to refine grains has not been applied in practice because it will cause damage to the mold or expensive additional equipment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: Lost Foam Casting of AZ91D Magnesium Alloy Castings

[0021] AZ91D magnesium alloy, after melting, refining, standing still and reaching the casting temperature, the metal melt is poured into the compact lost foam casting mold; after the pouring is completed, the vibration is immediately carried out according to the set process parameters: vibration The motor speed is 3000rpm, the vibration frequency is 100Hz, and the vibration amplitude is 1.0-2.0mm. The speed and vibration frequency of the vibration motor are constant. After vibrating until the casting is solidified, the sand box and the casting enter the next process.

[0022] In the absence of mechanical vibration, the primary phase in the lost foam casting AZ91D magnesium alloy microstructure grows in the form of dendrites, with large grains and well-developed secondary dendrites; when the set parameters are used for vibration solidification, most of the dendrites are Fragmentation occurs and secondar...

Embodiment 2

[0023] Embodiment 2: Lost Foam Casting of Aluminum Alloy Castings

[0024] ZL101 aluminum alloy, after melting, refining, standing still and reaching the casting temperature, pour the melt into the compact lost foam casting mold, start to vibrate before pouring and stop vibrating after solidification, the vibration process parameters are: vibration motor The speed is 750-1500rpm, the vibration frequency is 10-50Hz (the vibration frequency varies from small to large), and the vibration amplitude is 0.1-3.0mm. The sand box and castings enter the next process. After the castings are further cooled to the unpacking temperature, the castings are removed from the sand box out.

Embodiment 3

[0025] Embodiment 3: Lost Foam Casting of Ductile Iron Parts

[0026] After adjusting the chemical composition of the ductile iron and reaching the casting temperature at rest, pour the melt into the compact lost foam casting mold; after the pouring is completed, immediately follow the set process parameters: speed 750rpm, vibration frequency 10Hz, Vibrate with an amplitude of 0.5-1.0 mm until the sample is completely solidified and stop the vibration, and the sand box and castings enter the next process. After the casting is further cooled to the temperature out of the box, the casting is taken out of the sand box.

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PUM

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Abstract

The invention relates to a vibration solidification method of lost mold casting, pertaining to the precision casting field, which aims at fining the organization of castings of the lost mold casting, reducing the cost and enhancing the performance of castings. The invention comprises three steps of: production of foamy mold, imbedding the foamy mold into a casting box for filling and compacting sand as well as casting of molten metal; the invention is characterized in that: before and during the period of casting molten metal, during the solidification period, or the solidification period after the period of casting molten metal, casting box filled with foamy mold and scattered sand is vibrated at the frequency ranging from 10 to 100Hz and the amplitude ranging from 0.1 to 3.0mm, and rotation speed of a vibration motor that drives the vibration is 750 to 3000 rpm, and the vibration is stopped after the solidification of casting is completed. The invention has the advantages of low cost, easy operation and control, obvious fining effect of casting organizations, greatly improving performance and no environmental pollution, which is both suitable for the casting of the lost molds of nonferrous metals components, such as aluminum alloy, magnesium alloy, copper alloy, etc., and is also suitable for the casting of the lost mold of ferrous metal components, such as cast iron, cast steel and so on.

Description

technical field [0001] The invention belongs to the field of precision casting, and in particular relates to a casting method for refining the structure of lost foam castings and improving the performance of lost foam castings. Background technique [0002] Lost foam casting is a new type of casting technology with nearly no allowance and precise forming. It is known as "green engineering in casting". However, due to the coarse structure and low performance under ordinary gravity lost foam casting conditions, see Tian Xuefeng, Fan Zitian, Huang Naiyu. The effect of mechanical vibration on the microstructure and mechanical properties of lost foam casting magnesium alloys [J]. Chinese Journal of Nonferrous Metals, 2006, 16(11): 1838-1844, which limits the further expansion of the scope of application. [0003] Previous experimental studies have shown that the grain size has an important influence on the mechanical properties of metal materials. The finer the grain size of the ...

Claims

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Application Information

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IPC IPC(8): B22D27/08
Inventor 樊自田李继强田学锋董选普吴和保赵忠
Owner HUAZHONG UNIV OF SCI & TECH
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