Determination of Optimal Temperature for Defect-Free Casting of Aluminium in the LP-LFC Process

2011 ◽  
Vol 101-102 ◽  
pp. 934-937
Author(s):  
Ji Qiang Li ◽  
Zhong Zhao ◽  
Zi Tian Fan ◽  
Zhi Xin Jia ◽  
Wen Liu ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Aluminium Alloys ◽  
Low Pressure ◽  
Experimental Results ◽  
Metal Temperature ◽  
Lost Foam Casting ◽  
Optimal Temperature ◽  
Pouring Temperature ◽  
Lost Foam

Fluidity of ZL101 aluminium alloys in the low-pressure lost foam casting (LP-LFC) process has been investigated by altering various temperature variables. The experimental results indicate that the LP-LFC process had fine fluidity, and the pouring temperature was lower than conventional lost foam casting. The effect of the metal temperature on the fluidity is marginal in the LP-LFC process. Excessive pouring temperature not only aggrandizes energy consumption but also deteriorates porosity defect. The success of casting cooling fin demonstrates the advantages of LP-EPC process in producing high-complicated castings.

Study on the Cavity Defects of Low-Pressure Lost Foam Casting for Magnesium Alloy

2012 ◽  
Vol 201-202 ◽  
pp. 1151-1154
Author(s):  
Ji Qiang Li ◽  
Zhong Zhao ◽  
Zhi Xin Jia ◽  
Yun Wei Xu ◽  
Zhi Yuan Liu
Keyword(s):  
Magnesium Alloy ◽  
Low Pressure ◽  
Lost Foam Casting ◽  
Cavity Surface ◽  
Metal Mold ◽  
Pouring Temperature ◽  
Chemical Constitution ◽  
Energy Spectrometer ◽  
Lost Foam ◽  
Slag Entrapment

Cavity defects of low-pressure lost foam casting (LP-LFC) for magnesium alloy were investigated by using ladder samples and claviform samples.The physical feature of typical cavity defects of LP-LFC for magnesium castings had been tested by optical microscopy and scanning electron microscopy. And the chemical constitution of cavity surface was also tseted by energy spectrometer. The result indicated that the cluster cavity defects were formed with the application of higher vacuum at the metal-mold interface, which caused the liquid-EPS residue in the castings. Some irregular shape cavity defects were caused by slag entrapment or coating slough. These cavity defects could be avoided through reducing pouring temperature, filling velocity and vacuum level, improving the permeability of coating.

Temperature during the vibration-assisted compression of alfalfa

BioResources ◽  
2020 ◽  
Vol 16 (1) ◽  
pp. 141-150
Author(s):  
Xiaoyu Wu ◽  
Shuai Yang ◽  
Chundong Song ◽  
Kun Ding ◽  
Chuanzhong Xuan ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Vibration Frequency ◽  
Experimental Results ◽  
Maximum Temperature ◽  
Compression Time ◽  
Vibration Parameters ◽  
Reducing Energy ◽  
Compression Temperature

Compression of alfalfa into briquettes is an effective way to solve the problem of storage and transportation. In the process of compression, heat is generated and the temperature is raised in the material. In fact, the appropriate temperature can improve the quality of alfalfa briquettes and reduce the energy consumption of densification. In this study, the effect of assisted vibration on the compression temperature was tested. The results showed that when the vibration frequency was below 15 Hz, the temperature at the center and side in compressed alfalfa increased slowly with compression time. When the vibration frequency was above 20 Hz, it increased first and then decreased with the increase of time. Moreover, the maximum temperature value increased remarkably when the frequency was above 20 Hz. In the same vibration frequency and compression time, the center temperature in the compressed alfalfa was higher than the side temperature. The experimental results provide a reference for the determination of reasonable vibration parameters, and explanation of the effect of vibration on reducing energy consumption.

MNVPCS: Multinode Virtual-Point–Based Charging Scheme to Prolong the Lifetime of Wireless Rechargeable Sensor Networks

2019 ◽  
Vol 63 (2) ◽  
pp. 283-294
Author(s):  
Hong-Yi Chang ◽  
Zih-Huan Hang ◽  
Yih-Jou Tzang
Keyword(s):  
Energy Consumption ◽  
Sensor Networks ◽  
Experimental Results ◽  
Sensor Nodes ◽  
Wireless Charging ◽  
Mobile Wireless ◽  
Wireless Rechargeable Sensor Networks ◽  
Virtual Point ◽  
Over Time

Abstract Wireless-charging technology can utilize a mobile wireless charging vehicle (WCV) to rescue dying nodes by supplementing their remaining energy, and using WCVs in this way forms wireless rechargeable sensor networks (WRSNs). However, a WCV in a WRSN encounters several challenges, collectively called the optimized charging problem. This problem involves a set of sensor nodes randomly distributed on the ground for which the WCV must determine an appropriate travel path to charge the sensor nodes. Because these sensor nodes have different workloads, they exhibit different energy consumption profiles over time. Resolving the above-mentioned problem requires the determination of the priority of charging the sensor nodes based on the order in which they are expected to die and subsequently finding the most efficient path to charge the sensor nodes such that sensor death is avoided for as long as possible. Furthermore, the most efficient placement of the charging point needs to be considered when planning the charging path. To address this, the proposed multinode virtual point-based charging scheme (MNVPCS) considers both the planning of an efficient charging and the best location for the charging point. Experimental results show that MNVPCS can improve the lifetime of the entire WRSN and substantially outperform other methods on this measure.

Lost Foam Casting of Hydroturbine Blades Based on CAE

2011 ◽  
Vol 71-78 ◽  
pp. 694-697
Author(s):  
Jian Zhou ◽  
Li Jun Li ◽  
Jian Wen Yi ◽  
Ming Yang
Keyword(s):  
Model Material ◽  
Raw Material ◽  
Lost Foam Casting ◽  
Polystyrene Foam ◽  
Pouring Temperature ◽  
Fireproof Coating ◽  
Lost Foam ◽  
Foam Plastics ◽  
Lower Carbon ◽  
Carbon Martensite

The article studies the method which hydroturbine part is manufactured by lost foam casting for obtaining higher quality product.The lost model material is polystyrene foam plastics,the EPS diameters are selected in 0.5-0.76mm,the casting raw material is lower carbon martensite stainless steel(ZG06Cr13Ni4Mo).The style of open pouring system is adopted, ∑Fin-gate：∑Fcross-gate：∑Fdown-sprue=1：1.1：1.2, fireproof coating is mixed and coated,square sand box is used. The pouring temperature of liquid is 1600-1650°C.If the technology is strictly according to the design,good quality casting can be gotten.

scholarly journals Investigation of temperature, degree of vacuum, pattern coating thickness effects on mold filling in lost foam casting (LFC) process of A356 alloy

2015 ◽  
Vol 18 (2) ◽  
pp. 94-103
Author(s):  
Ha Ngoc Nguyen ◽  
Phong Quoc Le ◽  
Tri Nhat Nguyen ◽  
Hoai Dinh Lai
Keyword(s):  
Coating Thickness ◽  
A356 Alloy ◽  
Mold Filling ◽  
Complex Model ◽  
Production Costs ◽  
Lost Foam Casting ◽  
Pouring Temperature ◽  
Casting Technique ◽  
Lost Foam ◽  
Dipping Time

Lost foam casting (LFC) process with outstanding advantages has been known as a new casting technique in foundry engineering. Especially, the operation restricts errors of a mould because of using expanded patterns without parting line being appropriate for the complex model. Great interest in this technology of the casting manufacturers is mainly lower, compared with the traditional process, investment outlays and production costs. The use of unbounded sand also reduces its treatment cost, more friendly and simple with the environment. The study examines the simultaneous effects of pouring temperature, degree of vacuum, coating thickness (through dipping time) on mold filling in LFC. A356 aluminum alloy is used in this study. By using a full two-level factorial design of experimental technique to identify the significant manufacturing factors affecting the mold filling. Results of this investigation indicated that increasing pouring temperature, degree of vacuum and decreasing dipping time obtain casting with higher filling rate.

DOE Analysis of the Influence of Sand Size and Pouring Temperature on Porosity in LFC

2011 ◽  
Vol 121-126 ◽  
pp. 2661-2665
Author(s):  
S. Izman ◽  
Amirreza Shayganpour ◽  
M.H. Idris ◽  
Hassan Jafari
Keyword(s):  
Cast Alloy ◽  
Experimental Investigations ◽  
Lost Foam Casting ◽  
Thin Wall ◽  
Pouring Temperature ◽  
New Process ◽  
Casting Porosity ◽  
Lost Foam ◽  
Significant Factors ◽  
Sand Size

Lost foam casting is a relatively new process in commercial terms and is widely used to produce defect free castings owing to its advantages like producing complex shape and acceptable surface finish. In the present research, experimental investigations in lost foam casting of aluminium-silicon cast alloy, LM6, were conducted. The main objective of the study was to evaluate the effect of different sand sizes and pouring temperatures on the porosity of thin-wall castings. A stepped pattern was used in the study and the focus of the investigations was at the thinnest 3 mm section. A full 2-level factorial design experimental technique was employed to plan the experiment and subsequently identify the significant factors which affect the casting porosity. The result shows that increasing in the pouring temperature decreases the porosity in the thin-wall section of casting. Finer sand size is more favourable than coarse size for LFC mould making process.

Effect of Pouring Temperature and Melt Treatment on Microstructure of Lost Foam Casting of AL-Si LM6 Alloy

2011 ◽  
Vol 264-265 ◽  
pp. 295-300 ◽  
Author(s):  
Majid Karimian ◽  
Ali Ourdjini ◽  
Mohd Hasbullah Idris ◽  
M. Bsher ◽  
A. Asmael
Keyword(s):  
Cast Alloy ◽  
Eutectic Silicon ◽  
Lost Foam Casting ◽  
Grain Refiner ◽  
Pouring Temperature ◽  
Casting Quality ◽  
Melt Treatment ◽  
Different Temperatures ◽  
Lost Foam ◽  
Porosity Percentage

This paper presents the experimental investigation conducted on Al-Si cast alloy (LM6) cast using lost foam process. The main objective of the research is to investigate the effect of pouring temperature, section thickness and melt treatment on the microstructure of the lost foam casting of Al-Si alloy. Step pattern with five different sections was prepared from 20 kg/m³ density foam and poured at five different temperatures; 700, 720, 740, 760, and 780 with and without the addition of AlTiB as grain refiner. Analysis on microstructure, eutectic silicon spacing and porosity percentage were conducted to determine the effect of both parameters. The results show that pouring temperature has significant influence on the quality as well as microstructure of the lost foam casting of LM6 Al-Si alloy. Lower pouring temperature was found to produce finer microstructure casting. However, the addition of AlTiB as grain refiner did not affect the produced castings significantly whether in terms casting quality or microstructure.

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