Numerical Modeling of Microstructure Evolution and Dendrite Growth for Al-Si Alloy Casting during Low Pressure Die Casting

2007 ◽  
Vol 561-565 ◽  
pp. 1787-1792 ◽  
Author(s):  
Bin Li ◽  
Qing Yan Xu ◽  
Bai Cheng Liu
Keyword(s):  
Die Casting ◽  
Grain Morphology ◽  
Low Pressure ◽  
Solute Concentration ◽  
Dendritic Microstructure ◽  
Turbine Wheel ◽  
Alloy Casting ◽  
Low Pressure Die Casting ◽  
Wheel Casting ◽  
Pressure Die Casting

A modified Cellular Automaton model was presented to simulate the evolution of dendritic microstructure in low pressure die casting of Al-Si Alloy, which accounted for the heterogeneous nucleation, the solute redistribution both in liquid and solid, the interface curvature and the growth anisotropy during solidification. The free growth of single equiaxed dendrite and the evolution of multi dendrites with various crystallographic orientations were predicted. The variation of the dendrite tip velocity and local solute concentration at the solid/liquid interface were analyzed. The grain morphology of aircraft turbine wheel casting at different specimen points were predicted and compared with experimental results.

The Liquid Surface Pressure Control System for Low Pressure Die Casting Based on Fuzzy PID

2013 ◽  
Vol 706-708 ◽  
pp. 1063-1067
Author(s):  
Hai Feng Lin ◽  
Liu Qing Du ◽  
Li Ping Xiong
Keyword(s):  
Control System ◽  
Surface Pressure ◽  
Liquid Surface ◽  
Die Casting ◽  
Pressure Control ◽  
Low Pressure ◽  
Fuzzy Pid ◽  
Low Pressure Die Casting ◽  
Pressure Control System ◽  
Pressure Die Casting

The Liquid Surface Pressure Control is the key factor for the guarantee of Low Pressure Die Casting Quality. Regarding to the disadvantages of conventional PID Control such as pressure fluctuation, poor repeatability of the pressure curve, and so on, we propose Liquid Surface Pressure Control System (LSPCS) based on Fuzzy Adaptive PID. Design method of Fuzzy PID Controller has been discussed, and the realization methods of the hardware and software in this system are developed. This proposed system has a good performance in practice.

Application of Automobile Lightweight Alloys and the Development of its Die-Casting Technology

2011 ◽  
Vol 308-310 ◽  
pp. 785-789 ◽  
Author(s):  
De Fang Liu ◽  
Jie Tao
Keyword(s):  
Automotive Industry ◽  
Die Casting ◽  
Low Pressure ◽  
Development Trend ◽  
Casting Technology ◽  
Low Pressure Die Casting ◽  
Lightweight Alloys ◽  
Semi Solid ◽  
Pressure Die Casting ◽  
The Development Trend

With the development of lightweight vehicles, lightweight alloy materials has been increasingly used in automotive industry, automobile manufacturers are therefore looking for thinner and stronger materials so that the higher requirements has became a challenge to lightweight alloy die-casting technology. The paper summarized the applications of lightweight alloys in the automotive industry, and the new advances of lightweight alloys die-casting technology, such as low pressure die-casting, semi-solid die casting, oxygenation die-casting and the combination of different die-casting technologies, and discussed the development trend of the lightweight alloy die-casting technology.

Numerical Simulation of Filling for 7075 Alloy and TiB2/7075 Composites Wheel Prepared by Low Pressure Die Casting

2014 ◽  
Vol 904 ◽  
pp. 173-179
Author(s):  
Qian Gao ◽  
Bin Yang ◽  
Gui Sheng Gan ◽  
Huan Chun Wu
Keyword(s):  
Numerical Simulation ◽  
Die Casting ◽  
Mold Temperature ◽  
Low Pressure ◽  
Shrinkage Porosity ◽  
Physical Parameters ◽  
Pouring Temperature ◽  
Low Pressure Die Casting ◽  
7075 Alloy ◽  
Pressure Die Casting

Based on the experimental and calculation results between the reinforcing particles content and thermal physical parameters, low pressure die casting of wheels was taken as an example to study the casting property of the 7075 alloy and TiB2/7075 composites. The influences of die temperature, pouring pressure, pouring temperature and TiB2 content on the filling of 7075 alloy and TiB2/7075 composites wheels are studied by numerical simulation. Shrinkage porosity appears both in the spoke and rim of the wheel. The shrinkage porosity of the 7075 alloy decreases from 2.089% to 1.622% with mold temperature increasing from 100°C to 400°C. The shrinkage porosity of wheel decreases from 1.630% to 1.598% and 1.583% in the composite with 3 and 6wt.% TiB2 particles. Besides, shrinkage porosities decrease with increasing pouring temperature.

Numerical simulation of low pressure die casting of magnesium wheel

2006 ◽  
Vol 32 (3-4) ◽  
pp. 257-264 ◽  
Author(s):  
Ying-chun Wang ◽  
Da-yong Li ◽  
Ying-hong Peng ◽  
Xiao-qin Zeng
Keyword(s):  
Numerical Simulation ◽  
Die Casting ◽  
Low Pressure ◽  
Low Pressure Die Casting ◽  
Pressure Die Casting
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