Filling Characteristics of Magnesium Alloy Molten Metal in Squeeze Casting

2012 ◽  
Vol 502 ◽  
pp. 335-341
Author(s):  
Yun Chen ◽  
Ding Fang Chen ◽  
Juan Du ◽  
Ji Xiang Luo
Keyword(s):  
Magnesium Alloy ◽  
Fluid Mechanics ◽  
Molten Metal ◽  
Wall Thickness ◽  
Squeeze Casting ◽  
Air Entrainment ◽  
Filling Process ◽  
Fluid Level ◽  
Filling Characteristics

Based on fluid mechanics, the filling process of magnesium alloy step-plate casting molten metal was analyzed, and the filling characteristics were studied by numerical simulating. The results show the filling velocity and the wall thickness of casting have a great effect on the filling characteristics of magnesium alloy. When the filling velocity is less than 0.3 m/s, the liquid frontier of molten metal and the fluid level of thick upper surface fluctuate greatly, and the defects of air entrainment and oxide impurities will appear. When the filling velocity is more than 0.58 m/s, the molten metal fills in turbulent way, and the defects of sputter and air entrainment will appear. The correlation between the wall thickness of casting and the critical filling velocity presented in this paper can be used for the optimization of filling velocity.

scholarly journals Extrusion of magnesium alloy hollow profiles with axial variable wall thickness

2019 ◽  
Author(s):  
Maik Negendank ◽  
Vidal Sanabria ◽  
Sören Müller ◽  
W. Reimers
Keyword(s):  
Magnesium Alloy ◽  
Wall Thickness ◽  
Variable Wall Thickness ◽  
Variable Wall

Study on Pressurizing Velocity and Model of Vacuum Counter-Pressure Filling Process

2010 ◽  
Vol 139-141 ◽  
pp. 506-509 ◽  
Author(s):  
Qing Song Yan ◽  
Huan Yu ◽  
Zhi Feng Xu ◽  
Bo Wen Xiong ◽  
Chang Chun Cai
Keyword(s):  
Molten Metal ◽  
Absolute Temperature ◽  
Original Position ◽  
Correction Coefficient ◽  
Pressure Casting ◽  
Filling Process ◽  
Gas Flux ◽  
Counter Pressure ◽  
Relationship Of

During filling process of vacuum counter-pressure casting, the pressurizing velocity is one of the most important parameters, and it affects whole filling process of molten metal and the quality of castings, the pressurizing velocity must be reasonably controlled and chosen. Through analyzing the pressurizing velocity of vacuum counter-pressure casting filling process, the results show that pressurizing velocity is related with absolute temperature of down kettle gas, radius of rising tube, initial volume of down kettle, height from original position of molten metal to top of rising tube and gas flux. When other conditions are same during filling process of vacuum counter-pressure casting, pressurizing velocity is proportional to gas flux, and it is linear. Meanwhile, through experimental verification for relationship of pressurizing velocity with gas flux, their actual relationships and mathematical models are obtained, and correction coefficient is determined at the range from 0.95 to 0.98.

Influence of Pressure Amplitude on Formability in Pulsating Hydro-Bugling of AZ31B Magnesium Alloy Sheet

2011 ◽  
Vol 128-129 ◽  
pp. 397-402
Author(s):  
Lian Fa Yang ◽  
Liang Yi ◽  
Chen Guo
Keyword(s):  
Magnesium Alloy ◽  
Wall Thickness ◽  
Room Temperature ◽  
Alloy Sheet ◽  
Pressure Amplitude ◽  
Excellent Performance ◽  
Az31b Magnesium Alloy ◽  
Stress Components ◽  
Uniform Expansion ◽  
Az31b Magnesium Alloy Sheet

The formability of the magnesium alloy sheets is poor at room temperature even though the magnesium alloy sheets are attractive because of their excellent characteristics. Application of pulsating hydroforming is a new and effective method to improve the formability. The effects of the pressure amplitude on the maximum bulging height and minimum wall thickness of the formed parts of AZ31B magnesium alloy sheets are examined using finite element simulations. It is shown that the distribution of maximum bugling height and minimum wall thickness is similar for different pressure amplitude A, and a uniform expansion in bulging region is obtained, the cause of the uniform expansion obtained may be caused by the variation of stress components. The AZ31B sheet has an excellent performance in formability when the pressure amplitude and pulsating frequency are properly selected.

Effect of spikelet removal on the grain filling of Akenohoshi, a rice cultivar with numerous spikelets in a panicle

2004 ◽  
Vol 142 (2) ◽  
pp. 177-181 ◽  
Author(s):  
T. KATO
Keyword(s):  
Grain Filling ◽  
Rice Cultivar ◽  
Grain Weight ◽  
Filling Process ◽  
The Poor ◽  
Large Yield ◽  
Sink Capacity ◽  
Single Grain ◽  
Filling Characteristics

The Japanese rice cultivar, Akenohoshi, has numerous spikelets in a panicle (extra-heavy panicle type) and achieves a large yield sink capacity. However, this cultivar, as well as other extra-heavy panicle types, does not always produce higher yields because of poor grain filling of the spikelets on the secondary branches in a panicle. To determine whether the poor grain filling found in Akenohoshi was due to source-limited or sink-limited conditions, the present study examined the responses of grain-filling characteristics to several spikelet-removal treatments immediately after heading. Only when the spikelets on secondary branches remained was a significant increase in filled grain percentage in this spikelet position observed. This increase seemed to be associated with the increases in rate and duration of the grain-filling process and in single grain weight in this spikelet position. These results clearly indicate that the poor grain filling in the spikelet on secondary branches of Akenohoshi could mainly be attributed not to sink-limited conditions, but to source-limited conditions probably at specific stages of grain filling.

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