Numerical Simulations of Low Pressure Die-Casting for A356 Aluminum Rims

2017 ◽  
Vol 893 ◽  
pp. 276-280 ◽  
Author(s):  
Pei Hsing Huang ◽  
Wei Jen Wu ◽  
Chung Han Shieh
Keyword(s):  
Die Casting ◽  
Low Pressure ◽  
Optimization Of Process Parameters ◽  
Low Pressure Die Casting ◽  
Retained Melt Modulus ◽  
Porosity Defects ◽  
A356 Aluminum ◽  
Die Castings ◽  
Pressure Die Casting

This study conducted mold flow analyses on low pressure die-casting A356 aluminum rims to improve the shrinkage and porosity defects which usually occurs in die-castings so as to enhance the quality of die-casting wheels. We adopted different lift tube designs with cylindrical, taper opening and back taper opening structures while discussing the filling, exhaust, and solidification of molten flows and predicting the shrinkage and porosity formed based on the retained melt modulus. The study found that the configuration of lift tube as well as the optimization of process parameters such as the processing pressure and progressive time could effectively reduce the formations of shrinkage and porosity defects and improve the quality of die-castings.

Compute-Aided Design of Low Pressure Die-Casting Process of A356 Aluminum Wheels

2017 ◽  
Vol 864 ◽  
pp. 173-178 ◽  
Author(s):  
Pei Hsing Huang ◽  
Wei Jen Wu ◽  
Chung Han Shieh
Keyword(s):  
Traffic Safety ◽  
Lightweight Design ◽  
Die Casting ◽  
Casting Process ◽  
Low Pressure ◽  
Low Pressure Die Casting ◽  
Retained Melt Modulus ◽  
Porosity Defects ◽  
A356 Aluminum ◽  
Pressure Die Casting

The lightweight design of aluminum automobile wheel can easily bring about all kinds of defects during die-casting, which often causes wheel frame deformation and creep damages in the future use and in turn affects traffic safety. To understand the evolution of mold flow, temperature field, and solidification, the low pressure die-casting processes of A356 aluminum wheel were simulated by Anycasting software package. Various casting parameters combined with the designs of flow channel and overflows were adopted to reduce the defects occurred in wheel products. In addition, we adopted the retained melt modulus (RMM) to predict the position of defects to be formed as well as their distribution so as to eliminate the shrinkage voids and porosity defects during die-casting. The research findings showed that the setting up of overflow tank could effectively prevent the formation of shrinkage void and porosity of die-castings and significantly promote the quality and productivity of die-casting wheel products.

Comparison of Mechanical Properties of 357-T6 Aluminum Alloy Aast under Gravity Permanent Casting and Low Pressure Die Casting

2014 ◽  
Vol 941-944 ◽  
pp. 77-80
Author(s):  
Ping Chen ◽  
Jian Min Zeng ◽  
Wu Kui Gan ◽  
Jin Bo Liu
Keyword(s):  
Mechanical Properties ◽  
Die Casting ◽  
Solution Treatment ◽  
Low Pressure ◽  
Heat Treated ◽  
Low Pressure Die Casting ◽  
Mechanical Performances ◽  
Die Castings ◽  
Pressure Die Casting ◽  
Aging Parameter

357-T6 is an alloy that has been widely used due to excellent casting properties and mechanical performances. The aluminum wheels can be cast with both permanent and low pressure die castings. In this study, the mechanical properties of 357-T6 were compared between the gravity permanent casting (GPC) and low pressure die casting (LPDC). The specimens were cast through permanent and LPDC processes, respectively and were heat treated under T6, with different aging temperatures 155°C, 165°C, 175°C and 185°C after the solution treatment of 545°C for 9 hours. The ultimate tensile strength and elongation were tested for both processes. The results show that both tensile and elongation of low pressure die casting specimens are higher remarkably than those in gravity permanent casting. The optimized aging parameter is heating at 175°C for 4.5 hours after solution treatment.

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.

Sign in / Sign up

Export Citation Format

Share Document