Numerical simulation of low pressure die casting of magnesium wheel

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.

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Numerical Simulation for Low Pressure Die Casting of Al-Alloy Motor Enclosure and Technology Improvement

Materials Science Forum ◽

10.4028/www.scientific.net/msf.575-578.1389 ◽

2008 ◽

Vol 575-578 ◽

pp. 1389-1395 ◽

Cited By ~ 1

Author(s):

Guo Fa Mi ◽

Xiang Yu Liu ◽

Kuang Fei Wang ◽

Ji Tai Niu

Keyword(s):

Numerical Simulation ◽

Cooling System ◽

Die Casting ◽

Low Pressure ◽

Simulation Software ◽

Al Alloy ◽

Distribution Rule ◽

Technology Improvement ◽

Low Pressure Die Casting ◽

Pressure Die Casting

The FDM numerical simulation software, View-Cast system, was employed to simulate the mould-filling and solidification process in low pressure die casting (LPDC) of Al-alloy motor enclosure. The distribution of liquid fraction, temperature field and the solidification pattern of casting were revealed and the formation mechanism as well as distribution rule of the potential defects, namely gas pores and shrinkage pores, were predicted. Furthermore the solutions to eliminate them were presented. By reducing the pouring rate, the turbulent flow at the corner of casting had eased, so the gas pores could be eliminated. Then the force-cooling system was installed on the top of mould, which could reduce the volume of liquid islands efficiently so that the shrinkage defects can be decreased to its limit.

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.706-708.1063 ◽

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.

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.308-310.785 ◽

2011 ◽

Vol 308-310 ◽

pp. 785-789 ◽

Cited By ~ 4

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.

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