ELID Assisted Grinding of Optical Glass with Fine and Coarse Grained Copper-Resin Bonded Diamond Wheels

Zhao, Qingliang; Chen, Jun Yun; Ye, Jun

doi:10.4028/www.scientific.net/amr.76-78.76

Cited by 4 publications

(2 citation statements)

References 10 publications

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“…Zhao et al 8 conditioned the electroplated diamond grinding wheel (F75 mm) using a cup-shaped conditioning wheel (F150 mm) and realized ductile grinding of BK7 with nanoscale surface roughness. Furthermore, Zhao et al 9 applied electrolytic in-process dressing (ELID) technique to precondition the copper-resin-bonded diamond wheel and then cylindrical ground BK7 glass with Ra = 38-47 nm.…”

Section: Introductionmentioning

confidence: 99%

Precision grinding of BK7 glasses using conditioned coarse-grained diamond wheel

Zhao

Jin

et al. 2013

Proceedings of the Institution of Mechanical Engineers, Part B:

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For precision machining of large-sized optical elements, more attention is being paid to the ground surface quality, the processing costs and the machining efficiency. Besides the commonly used fine-grained diamond wheels, the coarse-grained diamond wheel is now also expected to be a promising tool with lower wheel wear rate and higher efficiency. However, conditioning of this kind of wheel is always a difficult issue to deal with. In this article, the efficient conditioning of the electroplated diamond wheel and precision grinding of BK7 glasses were investigated. Through the single diamond grit wear simulation, D3 steel was chosen as the conditioning tool. The worn diamond abrasive morphology and Raman spectroscopy analysis revealed the conditioning mechanism. Under different conditioning stages, the BK7 glasses were correspondingly ground exhibiting different surface integrity and grinding forces. The experimental results indicated that the wheel’s run-out error could be rapidly reduced to 5.8 µm because of the blend graphitization, passivation, diffusion and microcrushing of the diamond abrasives. The precision ground BK7 glasses could achieve a surface roughness of Ra < 20 nm and a subsurface crack depth around 2 µm, illustrating that the electroplated coarse-grained diamond wheel could be an alternative for precision grinding large-sized optical elements in terms of high accuracy, cost-effectiveness and high efficiency.

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Section: Introductionmentioning

confidence: 99%

Precision grinding of BK7 glasses using conditioned coarse-grained diamond wheel

Zhao

Jin

et al. 2013

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…The fine and coarse grained wheels can all generated the smooth surface with a copper-resin bonded diamond wheel after truing and pre-dressing with ELID [3]. ELID can be used for efficient material removal when the wheel/workpiece contacting area is large [4]. Furthermore, optimizing machining parameters were carried out for generating "smoothed" surfaces.…”

mentioning

confidence: 99%

Single Grit Scratching and Diamond Grinding on Optical Glasses

Zhao

Guo

2011

KEM

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Based on the single diamond grit scratching and normal grinding assisted with ELID (Electrolytic in Process Dressing), the surface/subsurface integrity of machined spectrosil 2000 and BK7 glasses under various material removal modes have been investigated. In Single diamond grit scratching tests, the scratching traces display four kinds of scratch characteristics according to different material removal modes. In the diamond normal grinding, the surface/subsurface integrity analysis shows BK7 glass has a better machinability than that of spectrosil 2000. Moreover, with the increasing ae(depth of cut), these two kinds of glasses had the opposite variation trends about the Ra values and the force ratio, which is attributed to various material removal modes. While contrasting these two kinds of optical glasses ground under the same aeparameters, the smaller grinding force and grinding force ratio (Fn/Ft), as well as the more stable force curves correspond to a better surface quality.

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