[논문]Study on the Production of Aluminum Components by Direct Rheo Die Casting with Electromagnetic Stirrer

Roh, Joong-Suk; Heo, Min; Jin, Chul-Kyu; Park, Jin Ha; Kang, Chung-Gil

doi:10.21289/ksic.2020.23.4.541

[국내논문] Study on the Production of Aluminum Components by Direct Rheo Die Casting with Electromagnetic Stirrer 원문보기

한국산업융합학회 논문집 = Journal of the Korean Society of Industry Convergence, v.23 no.4/1, 2020년, pp.541 - 547

Roh, Joong-Suk (School of Mechanical Engineering, Kyungnam University) , Heo, Min (School of Mechanical Engineering, Kyungnam University) , Jin, Chul-Kyu (School of Mechanical Engineering, Kyungnam University) , Park, Jin Ha (School of Mechanical Engineering, Kyungnam University) , Kang, Chung-Gil (School of Mechanical Engineering, Kyungnam University)

Abstract ▼ AI-Helper

This paper relates a rheo die casting using electromagnetic force, which is one of the representative semi-solid methods for aluminum. The most important factors in electromagnetic stirring would be the melt temperature, sleeve temperature, electromagnetic force, and input time. The effect of the temperature of molten alloy on the direct rheo-casting is assessed in this study. The temperature of the molten alloy is set to 590 ℃ with a solidification of 40%, 600 ℃ with 30%, and 610℃ with less than 20%. Under the condition of 590 ℃ with a solidification of 40%, the whole molten alloy is solidified, causing non-forming during forming process. Meanwhile, under the condition of 600 ℃, where the solidification was 30%, appropriate amount of molten alloy is solidified, filled well into the mold, resulting in good forming, while at 610 ℃ with the solidification of 20%, the molten alloy is not sufficiently solidified and scattered away. The investigation of the defects inside the product with the help of the X-ray equipment shows that the electromagnetic stirring at 590 ℃ with a solidification of 30% produces many air-pores inside the product.

Keyword

표/그림 (5)

그림 Fig. 1 Process of direct rheo die casting using EMS
표 Table 1. Chemical composition of A356 alloy (wt %)
그림 Fig. 2 The appearance of the product
표 Table 2. The mechanical properties of product
그림 Fig. 3 The pictures by X-ray of product

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제안 방법

However, in manufacturing semi-melt slurry, the industry is demanding the development of a new concept of rheology forming process due to increased production cycle time, excessive production cost, liquid segregation, and increased initial investment cost. Therefore, in this study, rheo-casting, in which the A356 alloy in a strongly stirred semi-solid state was directly filled into the cavity, was carried out by the use of electromagnetic stirring instead of slurry preparation.
To investigate the cause of the poor physical properties of the electronically formed product, the inner part of the product was examined through X-ray equipment. The internal inspection of the product was conducted by X-Ray transmission test with the Toshiba Tosray-150 HS equipment, and the final filled portion, which would have defects, was intensively examined. Figure 3 shows the photographs of defects observed inside the product using X-ray equipment.
A study on formability was conducted through a direct rheo-casting process using electromagnetic stirring. The experimental results are as follows.

대상 데이터

This work was supported by the World Class 300 Project R&D (No. S2640396) of the MOTIE, MSS (Korea).

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