Turning Of Optical Glasses At Room Temperature

Schinker, M. G.; Döll, W.

doi:10.1117/12.967104

Cited by 29 publications

(13 citation statements)

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“…Understanding of the effects of diamond type, crystal orientation, edge preparation and trace elements on the cutting performance was greatly advanced [29]. Important research into the diamond machining of hard and brittle materials such as silicon and germanium was undertaken by many [30][31][32][33]. Collectively, their work established today's production methods for the fabrication of infrared (IR) optics as applied in missile guidance systems, heat-seeking detection cameras and night vision sights [34].…”

Section: (A) Single-point Diamond Machiningmentioning

confidence: 99%

Ultra-precision: enabling our future

Shore

Morantz

2012

Phil. Trans. R. Soc. A.

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This paper provides a perspective on the development of ultra-precision technologies: What drove their evolution and what do they now promise for the future as we face the consequences of consumption of the Earth’s finite resources? Improved application of measurement is introduced as a major enabler of mass production, and its resultant impact on wealth generation is considered. This paper identifies the ambitions of the defence, automotive and microelectronics sectors as important drivers of improved manufacturing accuracy capability and ever smaller feature creation. It then describes how science fields such as astronomy have presented significant precision engineering challenges, illustrating how these fields of science have achieved unprecedented levels of accuracy, sensitivity and sheer scale. Notwithstanding their importance to science understanding, many science-driven ultra-precision technologies became key enablers for wealth generation and other well-being issues. Specific ultra-precision machine tools important to major astronomy programmes are discussed, as well as the way in which subsequently evolved machine tools made at the beginning of the twenty-first century, now provide much wider benefits.

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Section: (A) Single-point Diamond Machiningmentioning

confidence: 99%

Ultra-precision: enabling our future

Shore

Morantz

2012

Phil. Trans. R. Soc. A.

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“…Brehm et al [9] reported single point turning of glass enabled by thermal softening at elevated temperature to achieve transparent surfaces. Schinker and Doll [10] achieved transparent surfaces on a variety of inorganic glasses by diamond turning due to adiabatic melting and instantly annealing at higher cutting speeds. They also reported that cutting conditions to obtain transparent machining were strongly dependent on the type of glass.…”

Section: Introductionmentioning

confidence: 99%

Ultraprecision ductile mode machining of glass by micromilling process

Arif

Rahman

San

2011

Journal of Manufacturing Processes

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“…However, when the feed rate or depth of cut exceeds a critical specific value, the material in the workpiece changes from defined ductile to undefined brittle mode [4,5,6,7,8]. This means that when the undeformed chip thickness is reduced to sub-micron level, ductile machining can be achieved [3,9,10,11,12,13,14,15,16]. Using diamond tools with a negative rake angle, material can be removed through plastic shear, leaving a crack-free machined surface.…”

Section: Introductionmentioning

confidence: 99%

“…Using diamond tools with a negative rake angle, material can be removed through plastic shear, leaving a crack-free machined surface. The difference in the flow behavior of metals and glass under hydrostatic compression from the load-penetration diagrams was studied using a Vickers indenter [9]. In contrast to aluminium, which reacts to the penetration force with strong flow, the flow behavior of the glass presented here, which have extreme variations in their mechanical behaviour, is characterised by a small remaining impression depth and a high elastic recovery.…”

Section: Introductionmentioning

confidence: 99%

“…In contrast to aluminium, which reacts to the penetration force with strong flow, the flow behavior of the glass presented here, which have extreme variations in their mechanical behaviour, is characterised by a small remaining impression depth and a high elastic recovery. However, in any case, crack formation occurs during unloading even at low final loads [9]. A further study using nano-indentation showed the possibility of indenting a crack-free optical glass if the loading value is less than 0.1 N [10].…”

Section: Introductionmentioning

confidence: 99%

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An experimental study of optical glass machining

Zhang

2004

The International Journal of Advanced Manufacturing Technology

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Owing to brittleness and hardness, optical glass is one of the materials that is most difficult to cut. Nevertheless, as the threshold value of the undeformed chip thickness is reached, brittle materials undergo a transition from the brittle to the ductile machining region. Below this threshold, it is believed that the energy required to propagate cracks is larger than the energy required for plastic deformation. Thus, plastic deformation is the predominant mechanism of material removal in machining these materials in this mode. An experimental study is conducted to diamond-cut BK7 glass in ductile mode. As an effective rake angle plays a more important role than a nominal rake angle does, a discussion about this effective angle is carried out in the paper. The investigation presents the feasibility of achieving nanometric surfaces. Power spectral density (PSD) analysis on the machined surfaces shows the difference between the characteristics of the two modes. During the experiments, it is recognised that tool wear is a severe problem. Further study is in process to improve the cutting tool life.

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Turning Of Optical Glasses At Room Temperature

Cited by 29 publications

References 0 publications

Ultra-precision: enabling our future

Ultra-precision: enabling our future

Ultraprecision ductile mode machining of glass by micromilling process

An experimental study of optical glass machining

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