Research on Precision Mirror Machining Technology for W-Mo Alloy

2011 ◽  
Vol 487 ◽  
pp. 303-307
Author(s):  
Jia Liang Guan ◽  
H.W. Lu ◽  
X.H. Xiao ◽  
Y.C. Wu ◽  
Z.D. Chen
Keyword(s):  
Surface Quality ◽  
Formation Mechanism ◽  
Rotational Speed ◽  
Precision Machining ◽  
Work Piece ◽  
Mirror Surface ◽  
Precision Grinding ◽  
Elid Grinding ◽  
Ultra Precision

A new way of precision machining was studied through the experiments of Electrolytic In-Process Dressing (ELID) precision grinding and ultra precision lapping and polishing for W-Mo metal alloy. First a 22nm(Ra) surface was obtained through the ELID grinding, last a 11nm(Ra) surface was obtained after the process of lapping and polishing with 0.1～0.3 N/cm2pressure, 60～100 r/min rotational speed and other optimized parameters. Meanwhile, the formation mechanism of ultra precision mirror surface of the alloy was also analyzed. 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.

The Research of ELID Grinding Effect and Surface Quality on Carbonized Cold-Rolled Steel

2012 ◽  
Vol 229-231 ◽  
pp. 542-546
Author(s):  
J.L. Guan ◽  
Li Li Zhu ◽  
H.W. Lu ◽  
Zhi Wei Wang
Keyword(s):  
Surface Roughness ◽  
Surface Quality ◽  
Grinding Wheel ◽  
Rolled Steel ◽  
Precision Grinding ◽  
Cold Rolled Steel ◽  
Elid Grinding ◽  
Peripheral Velocity ◽  
Ultra Precision ◽  
Cold Rolled

In this document, the electrolytic in-process dressing ( ELID ) grinding technique is used for ultra-precision processing experimental research on the carbonized cold-rolled steel (HRC60～80).A surface roughness of Ra6～8nm was obtained after ELID precision grinding. The results proved that adopting micro grain size (W1.5～W36) and high hardness cast iron based diamond grinding wheel, increasing the wheel peripheral velocity (18～20m/s) and reducing grinding depth can effectively improve surface quality and bring the surface roughness down. The wheel peripheral velocity, grinding depth as well as grinding fluid are the main factors during ultra-precision grinding.

Manufacturing Technology of α-Fe Bonded Grinding Wheel Free Abrasive

2018 ◽  
Vol 780 ◽  
pp. 111-115 ◽  
Author(s):  
Ji Cai Kuai ◽  
Dmitrii V. Ardashev ◽  
Jia Qi Zhang ◽  
Hua Li Zhang
Keyword(s):  
Oxide Film ◽  
High Surface ◽  
Grinding Wheel ◽  
Mirror Surface ◽  
Precision Grinding ◽  
Abrasive Particles ◽  
Elid Grinding ◽  
Abrasive Grain ◽  
Ultra Precision ◽  
Free Abrasive

ELID ultra-precision grinding mirror surface can achieve nanometer precision. However, after the grinding wheel passivates the abrasive particles in electrolysis, it is easy to scratch the ultra-precision ELID grinding surface into the grinding process. In order to solve this problem, a non-abrasive grain α-Fe bonded grinding wheel is propose, which contains no abrasive particles. After electrolysis, oxide film is formed on the surface of the wheel. In ultra-precision ELID grinding, there is no abrasive particles involved, only the polishing effect of oxide film. There is no need to worry about the scratching of exfoliated abrasive particles that have been machined on ultra-precision ELID surfaces. Thus achieving extremely high surface accuracy.

Nanoprecision Micromechanical Fabrication

2008 ◽  
Vol 2 (1) ◽  
pp. 24-33 ◽  
Author(s):  
Hitoshi Ohmori ◽  
◽  
Weimin Lin ◽  
Yoshihiro Uehara ◽  
Yutaka Watanabe ◽  
...  
Keyword(s):  
Surface Quality ◽  
High Surface ◽  
Surface Grinding ◽  
Mirror Surface ◽  
Optical Components ◽  
High Surface Quality ◽  
Elid Grinding ◽  
Grinding Method ◽  
Electrolytic Dressing

ELID grinding is a method that realizes high quality mirror surface grinding in the nanometer order by use of electrolytic dressing metal bonded wheels consisting of fine abrasives. Currently, ELID grinding is increasingly being applied as an ultraprecision grinding method to achieve desired surface roughness, high surface accuracy, high surface quality, and high grinding performance. This paper introduces the ELID grinding and discusses some applications of ELID grinding to mirror surface grinding. For ultraprecision optical components, ultra fine smooth surface quality of sub-nanometer or sub-angstrom in Ra may be required. To satisfy these requirements, ultraprecision on machine measurement system had been developed. Synergistic the nano precision mechanical method, nano precision measurement method with nano resolution machine, the ultraprecision components can successful to fabricate.

Ultra-Precision Machining Technology of the Soft and Brittle Functional Crystal

2008 ◽  
Author(s):  
C. P. Lu ◽  
H. Gao ◽  
R. K. Kang ◽  
X. J. Teng ◽  
Q. G. Wang
Keyword(s):  
Surface Quality ◽  
Modern Technology ◽  
Diamond Turning ◽  
Precision Machining ◽  
Machining Efficiency ◽  
Magnetorheological Finishing ◽  
Precision Grinding ◽  
Ultra Precision ◽  
Definition Of ◽  
Important Branch

As an important branch of materials, soft and brittle functional crystals (SBFC) are widely used in the field of modern technology. However, the softness, brittleness, deliquescence, and strongly anisotropic natures of these materials present a challenge for their ultra-precision machining. The definition of SBFC is firstly given and their applications in many fields are also presented. For the ultra-precision machining technologies to satisfy the applied requirements, many methods such as single diamond turning, ultra-precision grinding, magnetorheological Finishing and so on, are successfully applied in SBFC materials, the challenges and difficulties occurred during machining these SBFC materials, such as KH2PO4, CdZnTe and CaF2, etc., are reviewed and the limits are also analyzed in detail. Moreover, many novel machining methods are suggested to achieve better surface quality and enhance machining efficiency.

Research on Cylindrical Precision Machining Adopting ELID Grinding Technology

2014 ◽  
Vol 1027 ◽  
pp. 97-100 ◽  
Author(s):  
Jia Liang Guan ◽  
Xiao Hui Zhang ◽  
Ling Chen ◽  
Xin Qiang Ma
Keyword(s):  
Wheel Speed ◽  
Process Equipment ◽  
Precision Machining ◽  
Precision Grinding ◽  
Machined Surface ◽  
Elid Grinding ◽  
Optimization Of Process Parameters ◽  
Ultra Precision ◽  
Efficient Processing ◽  
Mirror Grinding

In order to explore the new way to precision machining of the cylindrical, ELID precision mirror grinding technology are employed to precision ultra-precision grinding experiments. Given ELID precision mirror grinding technology has effectively solved the basis of many of the typical flat-precision machining difficult materials and efficient processing, through the conversion process equipment tools, and optimization of process parameters, obtained when the wheel speed in 16 ~ 20 m / s, when the grinding depth 10μm, cylindrical grinding state is best, which could obtain Ra0.025μm surface roughness of the machined surface.

Characterization of Cutting-Induced Heat Generation in Ultra-Precision Milling of Aluminium Alloy 6061

2013 ◽  
Vol 552 ◽  
pp. 201-206
Author(s):  
Su Juan Wang ◽  
Suet To ◽  
Xin Du Chen
Keyword(s):  
Surface Roughness ◽  
Surface Quality ◽  
Heat Generation ◽  
Feed Rate ◽  
Dimensional Accuracy ◽  
Precision Machining ◽  
Machined Surface ◽  
Single Crystal Diamond ◽  
Ultra Precision ◽  
Alloy 6061

The technology of ultra-precision machining with single crystal diamond tool produces advanced components with higher dimensional accuracy and better surface quality. The cutting-induced heat results in high temperature and stress at the chip-tool and tool-workpiece interfaces therefore affects the materials and the cutting tool as well as the surface quality. In the ultra-precision machining of al6061, the cutting-induced heat generates precipitates on the machined surface and those precipitates induce imperfections on the machined surface. This paper uses the time-temperature-precipitation characteristics of aluminum alloy 6061 (al6061) to investigate the effect of feed rate on the cutting-induced heat generation in ultra-precision multi-axis milling process. The effect of feed rate and feed direction on the generation of precipitates and surface roughness in ultra-precision raster milling (UPRM) is studied. Experimental results show that heat generation in horizontal cutting is less than that in vertical cutting and a larger feed rate generates more heat on the machined workpiece. A smaller feed rate produces a better surface finish and under a larger feed rate, scratch marks are produced by the generated precipitates and increase surface roughness.

A Study on Surface Quality of GaN with CMP Polishing Process

2011 ◽  
Vol 291-294 ◽  
pp. 1764-1767
Author(s):  
Wei Li ◽  
Ming Ming Ma ◽  
Bin Hu
Keyword(s):  
Surface Roughness ◽  
Particle Size ◽  
Gallium Nitride ◽  
Surface Quality ◽  
Chemical Reaction ◽  
Experimental Result ◽  
Precision Machining ◽  
Polishing Process

This paper introduced a polishing process for planarization of gallium nitride (GaN) wafer by polishing slurry that is made up by the chemical reaction with H2O2 solution and iron. Some different polishing parameters in the polishing process has been analyzed, which affect the surface quality of wafers, such as slurry particle size, polishing times, polishing slurry etc., and trying to improve the polishing process by optimization of the polishing parameters. The experimental result showed that this polishing method has an effect on the surface quality of GaN wafers, finally, the efficient and precision machining with surface roughness of GaN wafers of Ra0.81 nm has been gained by the CMP polishing process.

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