Effect of Slurry Temperature Distribution on Semi-Solid Die Casting

2016 ◽  
Vol 256 ◽  
pp. 107-112 ◽  
Author(s):  
Wen Ying Qu ◽  
Fan Zhang ◽  
Jiao Jiao Wang ◽  
Xiao Gang Hu ◽  
Qiang Zhu
Keyword(s):  
Temperature Distribution ◽  
Die Casting ◽  
Casting Process ◽  
Flow Patterns ◽  
Solid Alloy ◽  
Filling Process ◽  
Air Entrapment ◽  
Die Filling ◽  
Die Casting Process ◽  
Semi Solid

Semi-solid alloy slurries with different temperature distributions have diverse flow patterns of the slurries during die casting filling process. This different flow patterns can lead to various degrees of front separation of the slurry metal from the die cavity during die filling process. This separation can result in air entrapment, which is one of the origins for gas porosities and blisters occurred during followed heat treatment. Therefore, in this paper, the effects of slurry temperature distribution on filling patterns during die casting process were investigated. Based on partial filling experiments, positive and negative gradient temperature distribution, together with two homogeneous conditions 575°C, 579°C were compared by computer simulation. The results indicate that the positive gradient temperature condition of 357.0 slurry is more suitable for the semi-solid die casting of the connector, and 7 °C temperature gradient in slurry is appropriate for good filling.

Numerical Simulation of Semi-Solid Die Casting Process of Magnesium Alloy

2011 ◽  
Vol 474-476 ◽  
pp. 255-259 ◽  
Author(s):  
Ya Ping Hu ◽  
Yong Hu
Keyword(s):  
Numerical Simulation ◽  
Die Casting ◽  
Flow Characteristics ◽  
Casting Process ◽  
Die Design ◽  
Filling Process ◽  
Die Filling ◽  
Gas Cavity ◽  
Die Casting Process ◽  
Semi Solid

Numerical simulation can be used to predict die filling, and hence to optimize the die design. In the study, the flow characteristics of liquid filling comparing with those of semi-solid filling were analyzed. The results indicated that the liquid filling turned out to be turbulent, while the semi-sold filling had laminar flow characteristics which could reduce the foundry defects such as gas cavity and oxidation mixture. The distribution of pressure reduced gradually in the filling direction during semi-solid filling process which would generate back pressure that was favorable for filling process.

Numerical Simulation on the Filling Process of Rheological Die Casting and Forming Defects Analysis

2012 ◽  
Vol 192-193 ◽  
pp. 293-298 ◽  
Author(s):  
Fan Zhang ◽  
Nan Nan Song ◽  
Jun Zhang ◽  
Yong Lin Kang ◽  
Qiang Zhu
Keyword(s):  
Numerical Simulation ◽  
Die Casting ◽  
A356 Alloy ◽  
Casting Process ◽  
Solid Particles ◽  
Filling Process ◽  
Die Casting Process ◽  
Defects Analysis ◽  
Semi Solid ◽  
Forming Defects

According to semi-solid slurry rheological behavior, an apparent viscosity model of A356 alloy developed based on the Carreau model was established to simulate filling process of rheo-diecasting about automobile shock absorber parts and to compare with conventional liquid filling process. Numerical simulation results showed that the filling process of rheo-diecasting was smooth but difficult to splash, which reduced the tendency of the alloy oxidation and inclusion. Meanwhile, a certain percentage of the primary solid particles precipitated before filling and solidification shrinkage of semi-solid slurry were small. This benefited to reduce or eliminate shrinkage defects of the castings. Compared with conventional liquid die casting process, rheo-diecasting process had unique advantages in reducing the internal defects and improving mechanical properties of castings.

Development of Semi-Solid Die Casting Product Design and Die Design Technology for Aluminium Alloy Clamp

2016 ◽  
Vol 256 ◽  
pp. 334-339 ◽  
Author(s):  
Song Chen ◽  
Fan Zhang ◽  
You Feng He ◽  
Da Quan Li ◽  
Qiang Zhu
Keyword(s):  
Product Design ◽  
Die Casting ◽  
Casting Process ◽  
Die Design ◽  
Thick Wall ◽  
Thin Wall ◽  
Gating System ◽  
Cross Sectional ◽  
Die Casting Process ◽  
Semi Solid

Semi-solid slurry has significantly higher viscosity than liquid metal. This character of fluidity makes product design and die design, such as gating system, overflow and venting system, be different between these two die casting processes. In the present paper, taking a clamp product as an example, analyses the product optimization and die design by comparing the experimental and computational numerical simulation results. For the clamp, product structure is designed to be suitable for characters of SSM die casting process. The gating system is designed to be uniform variation of thickness, making the cross-sectional area uniformly reduce from the biscuit to the gate. This design ensures semi-solid metal slurry to fill die cavity from thick wall to thin wall. Gate position is designed at the thickest location, the gate shape of semi-solid die casting is set to be much bigger than traditional liquid casting. A good filling behaviour can be achieved by aforementioned all these design principles and it will be helpful to the intensification of pressure feeding after filling.

Multiphase modelling of the transient flow for Sn-15Pb and 357.0 alloys in semi-solid die casting process

2020 ◽  
Vol 278 ◽  
pp. 116534
Author(s):  
Wenying Qu ◽  
Daquan Li ◽  
Fan Zhang ◽  
Min Luo ◽  
Xiaogang Hu ◽  
...  
Keyword(s):  
Transient Flow ◽  
Die Casting ◽  
Casting Process ◽  
Die Casting Process ◽  
Semi Solid

Tensile Properties of Semi-Solid Die Cast AC4C Aluminum Alloy

2014 ◽  
Vol 680 ◽  
pp. 11-14
Author(s):  
Ke Ren Shi ◽  
Sirikul Wisutmethangoon ◽  
Jessada Wannasin ◽  
Thawatchai Plookphol
Keyword(s):  
Heat Treatment ◽  
Tensile Strength ◽  
Aluminum Alloy ◽  
Die Casting ◽  
Casting Process ◽  
Al Alloy ◽  
Die Cast ◽  
Die Casting Process ◽  
Semi Solid ◽  
Strength And Ductility

In this study, semi-solid Al-Mg-Si alloy (AC4C) was produced by using the Gas Induced Semi-Solid (GISS) die casting process. The tensile strength and ductility of the semi-solid die cast Al alloy (GISS-DC) after T6 heat treatment were investigated and compared with those of the conventional liquid die casting (CLDC). The microstructures of GISS-DC and CLDC observed by an optical microscopy were presented. The ultimate tensile strength (UTS) and yield strength (0.2% YS) of GISS-DC are compatible with those of the CLDC. However, the GISS-DC has better ductility than the CLDC, this may be due to the smaller and more globular primary α-Al phase and rounder shaped-Si particle microstructures presented in the GISS-DC. Common shrinkage pores and defects were also observed by SEM from the fracture surfaces of both alloys.

scholarly journals Study on microstructure and thermal conductivity of semi-solid die casting aluminum alloy

2021 ◽  
Vol 268 ◽  
pp. 01076
Author(s):  
Zengrong Hu ◽  
Xiaonan Wang ◽  
Xiaming Chen ◽  
Pengcheng Huan ◽  
Weihua Li ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Aluminum Alloy ◽  
Die Casting ◽  
Casting Process ◽  
Mechanical And Thermal Properties ◽  
Thin Wall ◽  
Mechanical Stirring ◽  
Die Casting Process ◽  
Casting Aluminum ◽  
Semi Solid

In order to improve the comprehensive properties of casting aluminum, and to fulfill the requirements of forming thin wall fins for communication products, mechanical stirring was employed to prepare the semi-solid aluminum alloy AlSi8. communication products were produced by the semi-solid die casting process. The microstructure and mechanical and thermal properties were studied. The test results show that the microstructure of semi-solid die-casting samples changes from dendrite to globular microstructure, and the average tensile strength, elongation and thermal conductivity are 220MPa, 7% and 170 W/(m*K), respectively, which is significantly higher than that of the common die-casting samples. It was proved that the semi-solid die casting technology can be used in actual production and improve the products quality.

Development of Horizontal Reheating System for Semi-Solid Die Casting and Its Microstructure Evaluation

2005 ◽  
Vol 475-479 ◽  
pp. 377-380
Author(s):  
P.K. Seo ◽  
Byung Min Kim ◽  
Chung Gil Kang
Keyword(s):  
Die Casting ◽  
Casting Process ◽  
Complicated Shape ◽  
Forming Process ◽  
Globular Structure ◽  
Liquid Segregation ◽  
Die Casting Process ◽  
Semi Solid ◽  
Reheating Process ◽  
High Frequency Induction

The parts manufactured by die casting process usually contain liquid segregation and porosities. To solve these problems, the semi-solid forming process has been applied. The process enables material in the semi-solid state to be completely filled, and parts with the complicated shape to be fabricated by applying relatively low pressure. This process is necessary in order to control the microstructure of the billet as well as to achieve the desired semi-solid billet state. In this study, a horizontal high-frequency induction heating device which can be fabricated by semi-solid forming irrespective of a billet's size was developed. A globular structure of the reheated billet and a billet's temperature distribution during the reheating process for A356 were investigated.

Sign in / Sign up

Export Citation Format

Share Document