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Online since: September 2013
Authors: Panphot Ruethaitananon, Tawinun Isariyamateekun, Kageeporn Wongpreedee
The temperatures had been specified for two factors including casting temperature at X1, X2 and flasking temperature at Y1, Y2.
This research had been studied and characterized the temperatures of casting effecting to physical properties of fusing metal such as thickness of interface layers and porosities.
Two types of aluminium metal interfaces at various flasking 230 °C and 250°C and casting temperatures factors 720°C and 750°C were selected.
Shows the thickness of the interface layers of the silver and aluminum from different factors Work piece No.
Ni: Structure and mechanical properties of aluminium alloy/Ag interlayer/steel non-centered electron beam welded joints, Transaction of nonferrous metals society of chaina, (2011) [5] F.B.
This research had been studied and characterized the temperatures of casting effecting to physical properties of fusing metal such as thickness of interface layers and porosities.
Two types of aluminium metal interfaces at various flasking 230 °C and 250°C and casting temperatures factors 720°C and 750°C were selected.
Shows the thickness of the interface layers of the silver and aluminum from different factors Work piece No.
Ni: Structure and mechanical properties of aluminium alloy/Ag interlayer/steel non-centered electron beam welded joints, Transaction of nonferrous metals society of chaina, (2011) [5] F.B.
Online since: November 2014
Authors: Mohd Faris Khamidi, Nadzhratul Husna Ahmad Puad, Syed Ahmad Farhan, Khairun Azizi Azizli
Reinforcement of Aerogel with binding materials can improve its mechanical and thermal properties to overcome its brittleness.
Table 1 below shows the comparison of physical properties between Aerogel and Maerogel.
The density of xonotlite-type calcium silicate is the main factor affecting the effective thermal conductivity of xonotlite–Aerogel composite insulation material, and the density of Aerogel has little influence.
Polymer crosslinking on a lower density silica framework was used in order to improve the mechanical properties.
Hyun, Effect of mixing on thermal and mechanical properties of Aerogel-PVB composites, Journal of Materials Science, 38 (2003) 1961-1966
Table 1 below shows the comparison of physical properties between Aerogel and Maerogel.
The density of xonotlite-type calcium silicate is the main factor affecting the effective thermal conductivity of xonotlite–Aerogel composite insulation material, and the density of Aerogel has little influence.
Polymer crosslinking on a lower density silica framework was used in order to improve the mechanical properties.
Hyun, Effect of mixing on thermal and mechanical properties of Aerogel-PVB composites, Journal of Materials Science, 38 (2003) 1961-1966
Online since: June 2012
Authors: Zhi Wei Han, Ke Feng, Jian Feng Cao, Yi Wen Kong, Shui Gen Wang
Therefore, it is not difficult to recognize that the process parameters and steel properties, which can be analyzed and considered by the two models described above, are the main influencing factors for slab quality.
Quality loss factors are obtained according to process parameters, which are related with slab quality.
A total of 18 quality loss factors are calculated in this model, including Loss Factor of Shell Stress at Mold Exit, Loss Factor of the Straightening Area Temperature, Loss Factor of Steel Crack Sensitivity, Loss Factor of Composition of Mold Powder and so on.
Based on the calculation characteristics, the quality loss factors are divided into three groups, which are named ETA loss factor, STA loss factor and LTA loss factor respectively.
Some affect the total strand, others only affect the slab in special region.
Quality loss factors are obtained according to process parameters, which are related with slab quality.
A total of 18 quality loss factors are calculated in this model, including Loss Factor of Shell Stress at Mold Exit, Loss Factor of the Straightening Area Temperature, Loss Factor of Steel Crack Sensitivity, Loss Factor of Composition of Mold Powder and so on.
Based on the calculation characteristics, the quality loss factors are divided into three groups, which are named ETA loss factor, STA loss factor and LTA loss factor respectively.
Some affect the total strand, others only affect the slab in special region.
Online since: April 2005
Authors: Kyoung Nam Kim, Yong Keun Lee, Kwang Mahn Kim, J.K. Kang
Introduction
The accuracy and dimensional stability of dental impression materials are important factors in a fit of
dental castings with abutment teeth.
Filler contents and compositions are affected in mechanical properties of hydrophilic addition silicone impression materials.
When the content of silica increased, consistency should be fall off, nevertheless the mechanical properties improved.
In order to improve the mechanical properties of MAS glass, calcium is replaced magnesium with various molar ratio.
Silane-treated filler did not represented any improved properties than before silane-treatment.
Filler contents and compositions are affected in mechanical properties of hydrophilic addition silicone impression materials.
When the content of silica increased, consistency should be fall off, nevertheless the mechanical properties improved.
In order to improve the mechanical properties of MAS glass, calcium is replaced magnesium with various molar ratio.
Silane-treated filler did not represented any improved properties than before silane-treatment.
Online since: January 2017
Authors: Qing Bin Liu, Da Wei Yao, Gang Lee, Heng Zhao
Other factors, such as μ phase and σ phase, reduce creep strength and toughness.
For the mechanical properties, the Tensile Test Machine (EMT 2000-B) is used to test the mechanical strength of INCONEL 718 alloy.
Results and Discussion Nb Segregation and Mechanical Properties.
Shirai, Characteristics of heat affected zone cracking in Inconel 718 cast alloy.
Shirai, Effect of homogenization heat treatment on heat affected zone cracking suspectibility.
For the mechanical properties, the Tensile Test Machine (EMT 2000-B) is used to test the mechanical strength of INCONEL 718 alloy.
Results and Discussion Nb Segregation and Mechanical Properties.
Shirai, Characteristics of heat affected zone cracking in Inconel 718 cast alloy.
Shirai, Effect of homogenization heat treatment on heat affected zone cracking suspectibility.
Online since: May 2011
Authors: Kai Wang, Lian Yu Wei, Shi Ning Li, Shi Bin Ma, Yang Feng Wu
Temperature is one of the most important factors affecting the design and performance of both flexible and rigid pavements.
Finite Element Model Of Cement Concrete Layer Overlay On Old asphalt Pavement By establishing three-dimensional finite element model ,the paper calculated parameter that affect mechanical properties of pavement structure, in which ANSYS software was adopted, pavement structure layers deadweight was ignored and assuming that earth subgrade bottom is fixed and four edges is free.
Finite Element Model Of Cement Concrete Layer Overlay On Old asphalt Pavement By establishing three-dimensional finite element model ,the paper calculated parameter that affect mechanical properties of pavement structure, in which ANSYS software was adopted, pavement structure layers deadweight was ignored and assuming that earth subgrade bottom is fixed and four edges is free.
Online since: April 2016
Authors: Adam Barylski, Norbert Piotrowski
Lapping is a very complicated and random process with the main outcomes, such as stock removal, roughness and flatness, as a result of numerous variables affecting the process quality.
It can be observed that grain E does not stick to the affecting partner and remains passive.
All the factors which influence lapping process are related of time.
Changes of factors as velocities, pressure or properties of the abrasive during machining can be repeatable and predictable.
However, some of factors can change random.
It can be observed that grain E does not stick to the affecting partner and remains passive.
All the factors which influence lapping process are related of time.
Changes of factors as velocities, pressure or properties of the abrasive during machining can be repeatable and predictable.
However, some of factors can change random.
Online since: June 2014
Authors: Doru Bardac, Constantin Dogariu
The proposed method can predict the regular pattern in which bearing stiffness and bearing span affect natural frequency and harmonic response.
The spindle system is one of the most important parts of the turning centre; its dynamic characteristics directly affect the cutting ability.
In this study, structural factors which influenced the critical speed of the spindle system were mainly discussed, and the analysis is shown as follows [9].
These modes are mainly affected by structural stiffness of the spindle head stock, which are further determined by the interface properties of linear components in the feeding mechanism of the head stock.
[7]- Ṧooṧ L’ - Contribution to the research of static and dynamic properties of CNC turning machine - STROJNỈCKY ĈASOPIS, 59, 2008, no. 5–6, pp. 231-239
The spindle system is one of the most important parts of the turning centre; its dynamic characteristics directly affect the cutting ability.
In this study, structural factors which influenced the critical speed of the spindle system were mainly discussed, and the analysis is shown as follows [9].
These modes are mainly affected by structural stiffness of the spindle head stock, which are further determined by the interface properties of linear components in the feeding mechanism of the head stock.
[7]- Ṧooṧ L’ - Contribution to the research of static and dynamic properties of CNC turning machine - STROJNỈCKY ĈASOPIS, 59, 2008, no. 5–6, pp. 231-239
Online since: January 2014
Authors: Wei Gang Zheng, Zhi Jun Liu, Ning Yang, Chun Long Li, Xin Yang
Simulation Analysis and Studying of Die Casting Forming Process for Crankcase
Weigang Zheng1, a, Zhijun Liu2, b, Ning Yang3,c ,Chunlong Li4,d, Xin Yang5,e
1,2,3,4,5College of Mechanical Engineering , Guizhou University, China
(aweigangzheng@163.com,b237097004@qq.com,c1259896330@qq.com
d676341095@qq.com,975228727@qq.com)
Keywords: Crankcase, Die casting, Local extrusion, metallographic test
Abstract: In recent years, with the rapid development of automobile, the production of complex parts adopt the die casting process such as crankcase box. the stress of market competition make greater demand on Casting Products quality, such as the organizational structure of products has no shrinkage porosity defect and has good mechanical properties. this article’s simulation analysis of die casting forming process for Box are based on software AnyCasting, analyzing the reasons of air trapping from the filling process, Solidification sequence, Residual melt modulus. and it can conduct local
Technological parameters .The main factors influencing the forming technology are the injection speed, pouring temperature and mold preheated temperature .When the injection speed is excessive, air entrapment phenomenon increase this moment, leading to the defects of castings increase.
It is necessary to control mold preheated temperature, because mold Generate heat exchange with external, and it can reduce forming Difficulty that the excessive chilling of mold affects.
Fig.10 Equilibrium diagram of traditional die casting Fig.11 Equilibrium diagram of local extrusion-die casting Summary (1) For the complex box parts, getting the basic dimension required through reasonable designed die casting technology parameters, But the trapped gas and isolation liquid phase which lead to shrinkage porosity and cavity Phenomenon easily, it will occur oil leakage in which casting suffers oil pressure and can’t meet the technical requirements. we demonstrated the reasons of the existence of the casting defects and position, and putting forward the countermeasures through filling process, solidification sequence, residual melt modulus based on AnyCasting simulation (2) It is reliable solution to set local extrusion feeding in the die-casting molds where genenrating shrinkage cavity easily for casting, namely after the completion of a liquid metal filling mould, using local feeding device which has certain mechanical pressure to keep the casting under the effect
Technological parameters .The main factors influencing the forming technology are the injection speed, pouring temperature and mold preheated temperature .When the injection speed is excessive, air entrapment phenomenon increase this moment, leading to the defects of castings increase.
It is necessary to control mold preheated temperature, because mold Generate heat exchange with external, and it can reduce forming Difficulty that the excessive chilling of mold affects.
Fig.10 Equilibrium diagram of traditional die casting Fig.11 Equilibrium diagram of local extrusion-die casting Summary (1) For the complex box parts, getting the basic dimension required through reasonable designed die casting technology parameters, But the trapped gas and isolation liquid phase which lead to shrinkage porosity and cavity Phenomenon easily, it will occur oil leakage in which casting suffers oil pressure and can’t meet the technical requirements. we demonstrated the reasons of the existence of the casting defects and position, and putting forward the countermeasures through filling process, solidification sequence, residual melt modulus based on AnyCasting simulation (2) It is reliable solution to set local extrusion feeding in the die-casting molds where genenrating shrinkage cavity easily for casting, namely after the completion of a liquid metal filling mould, using local feeding device which has certain mechanical pressure to keep the casting under the effect
Online since: February 2013
Authors: Wen Zheng Wu, Lei Zhang, Xing Tian Qu, Wan Shan Wang, Ji Zhao, Di Zhao, Yu Zhang
The main failure mode of many mechanical components is fatigue failure [3].
The fixing of postoperative mandible directly affects the mandible bone healing and the stress distribution.
This step directly affects the time and the conclusion of the analysis process.
Fig. 8 Fatigue life on 450N Fig. 9 450N fatigue at A Fig. 10 Cloud of fatigue safe factor on 450N When the load is 100N or 200N, fatigue damage will not happen.
Fukunaga, Relationship between fatigue life, changing of mechanical properties and dislocation structure during fatigue in pure titanium.
The fixing of postoperative mandible directly affects the mandible bone healing and the stress distribution.
This step directly affects the time and the conclusion of the analysis process.
Fig. 8 Fatigue life on 450N Fig. 9 450N fatigue at A Fig. 10 Cloud of fatigue safe factor on 450N When the load is 100N or 200N, fatigue damage will not happen.
Fukunaga, Relationship between fatigue life, changing of mechanical properties and dislocation structure during fatigue in pure titanium.