Search results

The experiments prove surface quality of the work piece was guaranteed by ELID grinding, and which was also greatly affected by some parameters in lapping and polishing such as pressure, rotational speed.
A precision mirror surface roughness of Ra 11nm was obtained after ELID precision grinding and traditional mechanical lapping experiments.
The temperature of grinding zone is higher than ordinary steel which is the causation of low thermal conductivity. 3) The wheel easily adhesion plug The grinding wheel abrasive wear is serious in the high temperature and big force of grinding; grindings are easy to adhere to the wheel, which make the grinding effect of abrasive incapable. 4) Difficult to guarantee the quality of grinding surface In grinding, these factors listed and the easily passivation wheel make the high-temperature alloy surface stress larger, easily burn, alligator crack, the surface integrity is difficult to guarantee[1].
The chemical constitution and mechanical property of W-Mo alloy is listed in Table 1.
Table 1 The chemical constitution and mechanical property of W-Mo alloy Material Chemical constitution Mechanical property W-Mo alloy W Mo Ni Fe σb σ0.2 HB 80 15 2.5 2.5 680N[mm2] 650N[mm2] 210 Table 2 The experimental installation ELID grinding condition Machine MSG-612CNC-FA grinding machine Wheel Cast iron bonded diamonds wheel (W36, W10, W5, W1.5) Power source Special dc pulse supply Grinding fluid Special grinding fluid［5］ Polishing condition Producing machine Conversion speed regulation optics biaxial polishing machine Polishing pad Thin blanketing or cotton fabric Polishing fluid Ⅰ White alundum(grain size W1)+40 times coal oil + little animal oil and seed oil Ⅱ Diamond(grain size W0.5)+ 45 times coal oil + lubricant grease and seed oil Measure machine HALIANG2205 surface roughness admeasuring apparatus

Supporting bearing and spindle span are the two major factors that influence the spindle's low order modal characteristics, which embody a concentrated reflection of the dynamic characteristics, and directly affect the accuracy of the whole machine accuracy.
Its material properties are shown in Fig. 5.
The material property [4] of the bearing is shown in Tab.1.
Table.1 Material Properties of bearing Material Density Elastic modulus Poisson’s ratio Bearing GCr15 steel 7800kg/m3 1.99х1011 0.269 Rolling body Si3N4 3440kg/m3 3.2х1011 0.3 By processing the holder can be seen using the cutting tool for drilling and boring compound tool.
Hand book of mechanical design [M].

Several factors complicate the specification of precise data.
The technical analysis that is required to verify these properties are very different, and further, these qualities depend on different product properties.
Sometimes a correlation between different properties is assumed, and sometimes properties are independent.
Material data The mechanical properties of most common structural materials, especially metals and unreinforced polymers, are relatively well known.
In addition, material properties have some scatter.

Valve bonnet and valve seat are the key parts of diaphragm gas meter, which compose the main factors of its metering error.
They play the role of flow seal and mechanical operation in the process of rotation, composing the main factors of metering error about diaphragm gas meter.
And there is an important relationship between surface texture and the mechanical, physical properties of workpiece.
At the same time, due to the presence of measurement error sources, there is a little deviation between the experimental value and the stylus profilometer measuring value, which does not affect the judging results whether the measured workpiece are qualified or not.
Mao, Research of air-tight property detector used in diaphragm style gas meter, Journal of China University of Metrology, 22 (2011) 15-19

Therefore it shows significant value in mechanical manufacturing field [2-4].
It is a new way of surface modification to titanium alloys, different from the popular hard coatings or films, which usually enhance wear resistance at the cost of degradation of fatigue properties.
It is known that the frictional force is affected by two factors: one is the adhesion force from the atomic interaction between two sliding surface in contact and another one is the force needed to deform the interacting asperities [9].
The combination of these two phases endowed the layer with appropriate comprehensive properties, moderate hardness, well balanced toughness and ductility.
Miyazaki, Mechanical properties of Ti–Ni shape memory thin films formed by sputtering, Materials Science and Engineering. 273-275(1999)754-757 [4] Clayton P, Tribological behavior of a titanium-nickel alloy, Wear. 162-164(1993)202-210

Introduction Surface roughness is an important property of aggregate and most of mortar properties are influenced by it.
The grain surface roughness and grain shape have impact on mortar properties.
Properties of the mortars.
SRa of gypsum plaster is primarily affected by the porosity.
Lin, Influence of aggregate surface roughness on mechanical properties of interface and concrete, Construction and Building Materials 65, 338-349 (2014)

We investigated the influence of the surface properties of a low-temperature-grown GaAs photoconductive antenna on terahertz (THz) response power.
The crystal layer is also important since it determines to a large extent the electrophysical properties of LT-GaAs.
In this paper, we investigated the correlation between THz power and the surface properties of an LT-GaAs photoconductive antenna.
The surface properties were quantified by the roughness and the grain size.
Seto, The electrical properties of polycrystalline silicon films, J.

The moisture present in the composites affects strongly their mechanical properties, which leads to necessity of studies in this area.
Composites with different fiber contents (20%, 25.5%, 37%, 44.6% and 50%)were molded by compression, and chosen the fiber content that showed better mechanical properties (44.6%).
The mechanical properties tests of the composites were conducted in accordance with ASTM D-3039 and ASTM D-256 standards for tensile test and impact test, respectively.
From these studies we can notice that moisture content and temperature up to about glass-transition temperature have provoked small effects on fiber-dominated composite properties, but significantly reduce matrix-dominated composite properties.
Ziegmann, Water absorption behavior and its influence on properties of GRP pipe, J.

Cutting parameters and tool geometry have been shown to affect the cutting energy in bone cutting processes.
The use of ultrasonic chisel and parameters affecting the cutting of bovine bone were briefly discussed, in vitro in [13].
One of the influential factors in reducing bone temperature during cutting operation is the use of saline irrigation [5,14].
A two-dimensional FE model of bone bone cutting was produced based on the mechanical properties reported in the literature [5,12].
The FE model was based on in-house mechanical properties obtained from tension and nanoindentation tests.

The construction and optimization of high-precision “standard circuit” High voltage standard capacitor filled with gas was always enabled as the high voltage part of voltage divider for power-frequency voltage measuring, whose character is higher stability capacitance and the almost negligible factor affected by environment (According to the relative regulations for standard capacitor filled with gas[4], the impact factor of temperature and voltage to capacitance is at the level of 10-5).
References [1] China mechanical industry standard, JJG1021, “Instrument Transformers in Power System”, 2007
Zajac, “Metrological Properties of High Voltage Instrument Transformers after Many Years' Service”, CIGRE session 2004, Paper A3-1 13
[3] China mechanical industry standard, JJG169,“Instrument Transformet Test Set”, 1993
[4] China mechanical industry standard, JB/T 1811, “Standard Capacitor filled with Compressed Gas”, 1992.