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Influence of Grain Size and Grain Boundary of workpieceon Micro EDM Qingyu Liu1,2,a, Qinhe Zhang1,2,b*,Jianhua Zhang1,2,c, Min Zhang1,2,d 1School of Mechanical Engineering,Shandong University, Jinan,China 2Key Laboratory of High Efficiency and Clean Mechanical Manufacture of Ministry of Education, Shandong University, Jinan 250061, China aQingyu1207@126.com, bzhangqh@sdu.edu.cn, cjhzhang@sdu.edu.cn, dzhangminares@foxmail.com Keywords:MicroEDM; Material microstructure; Grain boundary;Grain size; Abstract.Micro EDM is used to machine micro features which are of the same size order as material microstructure of workpiece.
Due to the difference of the thermal properties between the crystal grain and grain boundary, the machining performance of micro EDM varies with the crystal grain sizes of workpiece.
A lot of studies demonstrate that the material microstructures, especially the grain size and grain boundary, have noticeable influence on micro EDM.The problem was encountered that material microstructure which is insignificant in macroEDM, but important in microEDM[3].It was found that a variation in grain sizes significantly influences theperformance of EDM, whichlargely related to the microstructure and the properties of the materialin micro EDM[4].
Due to its thermal material removal mechanism, performance of micro EDM has a close relationship with the thermal properties of material, especially the melting point and thermal conductivity.
Kunieda, Study on factors determining limits of minimum machinable size in micro EDM.

The study from [2] stated that sawdust briquettes as fuel have physical and mechanical properties as well as thermal.
Table 3 summarizes the interactions between the response variables and the predictive factors.
Research on the relationship between factors in the volatile matter is in line with research by [11] which explains that the decomposition of biomass structure significantly affects temperature.
Carbonization could improve the physical properties of teak sawdust.
Bakhri, The Effect of Particle Size, Pressure, Holding Time and Drying Temperature to the Physical and Mechanical Properties of Briquettes, Mater.

The green strength of a powder compact results from the mechanical interlocking of the irregularities on the particle surfaces.
This work investigates and quantitatively evaluates the factors influencing the green strength of the powder compacts.
These properties affect both the ability of the particles to deform (and therefore reduce porosity) and to mechanically lock together.
In reality, in the latter case, these two effects (density and strength) should not be considered independently as porosity will in itself markedly affect the strength.
The reason for this is currently unclear, but it is possible that any TiN layer formed on the particle surfaces acts as a lubricant and interferes with the mechanical bonding at the interfaces.

Results show that there is a close correlation between compression properties T2, T100, drape performance F0, shear stiffness G and stereotyped pleat recovery Angle.
The factors of influencing seamless sizing effect include the ironing process parameters, fabric performance, organizational structure, weaving processing parameters and many others.
Test project Mechanical properties Mechanical properties mainly include the following indicators: compression thickness T2, T100; bending length C; extensibility E5; bending rigidity B and shear stiffness G and Static drape coefficient F0.
Extensibility is too large, the fabric is easy to stretch, which affects the clothing size stability [4].
Conclusions (1)There is a strong direct correlation between compressive properties T2, T100, draping property F0, shear stiffness G and Stereotyped pleat recovery angle in 7 performances of fabrics.

Mechanical properties of the strip were investigated by tension test, bending test and deep drawing.
Mechanical properties of the strip cast by the single roll caster were as same as those made by DC casting.
The roll speed is most important factor in the roll cater.
The mechanical property of the strip with smooth scribed surface became better.
Summary Properties of a single roll caster equipped with a scraper were shown in this paper.

Each type composite is affected by factors such as fiber volume fraction and curing conditions.Each type composite is studied age (3, 7 and 28).
Fiber types Tensile strength (MPa) Aspect ratio (l/df) Elastic modulus(MPa) Length (mm) Density (g/cm3) Diameter (mm) Hooked steel fiber 1,100 60 205 30 7.85 0.5 Table 1.Mechanical properties of steel fiber Table 2.
Conclusion In this study, the mechanical properties of SFRC and AASC were evaluated and concluded.
The mechanical properties of AASC with 100% replaced cement aresimilar.
Sanjayan:Workability and mechanical properties of alkali activated slag concrete, Cement and Concrete Research 29, pp. 455-458 (1999)

The model can be used in feedback positioning control factor and develop precision high speed ball-screw system.
Measuring properties included positioning error, strain on nut, temperature rising of screw and nut.
Heat convection factor and enviroment temperature always vary with time.
In the screw side, thermal effect is the major factor for elongation of screw.
Different applied normal load will affect the straightness in the radial direction.

Exceeding the optimum amount of adhesion promoter in the solution led to a decrease in the mechanical properties of the composite.
It ensures good sliding properties of the fibre bundles due to polymer film builders.
Limiting factor of the used silane was the poor water solubility.
The mechanical properties decrease at a concentration of 9.5 %.
By means of silane-based adhesion promoter the mechanical properties of composite panels can be increased.

Precise material internal tolerances and controlled manufacturing processes are key factors for enhanced properties for direct quenched and tempered (DQ+T) steel.
Mechanical Properties The new steel, when rolled using the optimized plate rolling practices, meets or exceeds the requirements of EN 10025-6 for the S690QL grade.
Table 2 shows the mechanical properties of the newly developed steel compared to EN 10025-6 S690QL requirements.
In order to ensure excellent weldability and heat affected zone (HAZ) properties, the carbon equivalent is kept at a low level (see Table 3.).
This optimized processing resulted in a good combination of mechanical properties with exceptional increases in impact toughness and DBTT.

Introduction Titanium alloy has high strength, high temperature strength, corrosion resistance and other excellent properties, so it is widely used in the aero technology.
Therefore, by selecting the appropriate tool materials the cutting property can be improved.
The chemical elements of PCBN cutting tools and titanium alloy contact surface could spread to each other, which can change the chemical composition of the both and affecting its performance.
The hard alloy particles(Fe and Si) scratch the surface of the tool, which caused tool wear by mechanical friction is one of the most common wear and tear factor The hard particles of titanium alloy and the bonding effected will lead to PCBN tool micro-chipping.
Above all of wear factors influence each other and promote each other, such as, with the proliferation of diffusion wear and oxidation wear, and increase mechanical wear while promoting fracture wear and the generation of micro-chipping wear.