scholarly journals Effect of Multipoint Sequential Water Mist Cooling of Casting Die on Microstructure and Mechanical Properties of AlSi11 Alloy

2012 ◽  
Vol 12 (4) ◽  
pp. 145-150
Author(s):  
R. Władysiak
Keyword(s):  
Mechanical Properties ◽  
Cooling System ◽  
Die Casting ◽  
Computer Control ◽  
Casting Process ◽  
Water Mist ◽  
Microstructure And Mechanical Properties ◽  
Casting Cycle ◽  
Mist Cooling ◽  
Die Casting Process

Abstract The work is a continuation of research on the use of water mist cooling in order to increase efficiency of the die-casting process for aluminum alloys. The paper describes the multipoint sequential cooling system of the casting die and its computer control and monitoring. It also includes results of the tests and analysis of cooling methods during making of the casting. These methods differ from each other in the sequence of casting die cooling and cause effective changes in microstructure and mechanical properties of castings made of AlSi11 alloy. The study demonstrated that the use of multipoint sequential cooling with water mist affects the microstructure refinement and reduces the segregation in the cast as well as more than by 20% increases the mechanical properties of castings in the rough state. The study also demonstrates that the sequential cooling of casting die accelerates the cooling of the casting and shortens die-casting cycle.

Computer Control the Cooling Process in Permanent Mold Casting of Al-Si Alloy

2013 ◽  
Vol 58 (3) ◽  
pp. 977-980 ◽  
Author(s):  
R. Władysiak
Keyword(s):  
Mechanical Properties ◽  
Die Casting ◽  
Computer Control ◽  
Casting Process ◽  
Water Mist ◽  
Permanent Mold ◽  
Cooling Process ◽  
Steel Mold ◽  
Microstructure And Mechanical Properties ◽  
Casting Cycle

Abstract The paper presents the test results of a computerized control system the sequential cooling process of permanent mold with use of water mist in the gravity die casting process. It describes the process for preparing high-quality casts made of AlSi7Mg alloy that achieves enhanced mechanical properties. A scheme of developed device and drivers for selected methods of sequence cooling for manufacturing of castings made in permanent steel mold was presented here. Also the microstructure and mechanical properties of received aluminium casts were described. It was shown that the use of a computer system to control the water mist cooling point of the mold not only accelerates the cooling of the cast and the gravity die casting cycle shortens, but also it has a positive effect on the microstructure and mechanical properties of castings made of unmodified AlSi7Mg alloy in a raw state.

scholarly journals Structure of AlSi20 Alloy in Heat Treated Die Casting

2015 ◽  
Vol 15 (1) ◽  
pp. 113-118 ◽  
Author(s):  
R. Władysiak ◽  
A. Kozuń
Keyword(s):  
Cooling System ◽  
Die Casting ◽  
Computer Control ◽  
Water Mist ◽  
Research Station ◽  
Heat Treated ◽  
Wide Range ◽  
Mist Cooling ◽  
Casting Aluminum ◽  
Hypereutectic Silumins

Abstract The work is a continuation of research on the use of water mist cooling in order to increase efficiency of die-casting aluminum alloys using multipoint water mist cooling system. The paper presents results of investigation on crystallization process and microstructure of synthetic hypereutectic AlSi20 alloy. Casts were made in permanent mold cooled a with water mist stream. The study was conducted for unmodified AlSi20 alloy and a modified one with phosphorus, titanium and boron on the research station allowing sequential multipoint cooling using a dedicated program of computer control. The study demonstrated that the use of mold cooled with water mist stream and solution heat treatment allows in wide range for the formation of the microstructure of hypereutectic silumins. It leads to the growth of microstructure refinement and spheroidizing of phases in the casting.

The Effect of Stirring Current and Stirring Time on Microstructure and Mechanical Properties in Rheo Die Casting Process

2006 ◽  
Vol 116-117 ◽  
pp. 526-529
Author(s):  
P.K. Seo ◽  
C.G. Kang ◽  
Byung Min Kim
Keyword(s):  
Mechanical Properties ◽  
Die Casting ◽  
Casting Process ◽  
Solid Particles ◽  
Semisolid Processing ◽  
Experimental Conditions ◽  
Microstructure And Mechanical Properties ◽  
Stirring Time ◽  
Die Casting Process ◽  
Pressure Die Casting

Semisolid processing is now becoming of greater interest for the production of various parts than pressure die casting. In the rheo die casting process, the important thing is to control the solid particles behavior during the rheo die casting process. So, in this paper, to find out the effect of stirring current and stirring time on the microstructure and mechanical properties, rheo die casting experiments were performed according to the stirring current such as 0, 20, 40 and 60 A and the stirring time such as 20, 40 and 60 sec. The results to the experimental conditions were analyzed.

Study on Local Extrusions' Effects on Improvement of Die Casting Prismatic Parts' Forming Quality

2013 ◽  
Vol 312 ◽  
pp. 475-479
Author(s):  
Wei Gang Zheng ◽  
Cun Hong Yin ◽  
Yu Hong Yuan ◽  
Zhen Min Pan ◽  
Chao Tang
Keyword(s):  
Mechanical Properties ◽  
Die Casting ◽  
Casting Process ◽  
Extrusion Process ◽  
Shrinkage Porosity ◽  
Shrinkage Cavity ◽  
Prismatic Parts ◽  
Porosity Defects ◽  
Die Casting Process ◽  
Casting Production

This paper analyzes traditional die casting process to find out the reasons that cause shrinkage cavity and porosity defects in casting. An optimized process of die casting by using local extrusion is proposed. A device used in local extrusion which realizes forcing compensating contraction on key parts of crankcase is designed and the parameters of local extrusion process are discussed. Compared the mechanical properties and microstructure of local extrusion used in die casting production with traditional. It shows that local extrusion used in die casting production can not only achieve the aim eliminating shrinkage porosity and cavity of a casting but also can refine grain to improve the mechanical properties.

The Effect of Scandium on the Mechanical Properties of A356 Aluminium Alloy

2016 ◽  
Vol 707 ◽  
pp. 144-147
Author(s):  
Ying Pio Lim ◽  
Wei Hong Yeo ◽  
A. Masita
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Aluminium Alloy ◽  
Die Casting ◽  
A356 Alloy ◽  
Charpy Impact ◽  
Casting Process ◽  
Die Casting Process ◽  
Charpy Impact Strength ◽  
A356 Aluminium Alloy

In this project, the addition of scandium (Sc) into A356 aluminium alloy was studied for its effect on the mechanical properties after gravity die casting process. Scandium addition was administered at the weight percentages of 0.1, 0.2 and 0.3. The results obtained in this work revealed that scandium can significantly enhance the mechanical properties of A356 alloy in terms of tensile strength, hardness and charpy impact strength. In general, the addition of 0.2 wt% Sc in A356 alloy was found to be able to achieve the maximum tensile strength of 172.94MPa as compared to 136.03MPa for sample without Sc. No significant improvement in tensile strength was found when more than 0.3wt% added to the alloy. As for hardness, the sample with 0.3 wt% Sc attained the maximum Vicker’s hardness of 86.60 HV as compared to 76.48 HV for unmodified A356. Similarly, the addition of 0.3wt% Sc in A356 can achieve highest impact energy of 2.71J as compare to 1.09J for unmodified A356.

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