Transparent single-point turning of optical glass:

Brehm, Ruud; Dun, K. van; Teunissen, Joerg; Haisma, J.

doi:10.1016/0141-6359(79)90101-6

Cited by 38 publications

(8 citation statements)

References 3 publications

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“…In accordance with this fact, investigations on the heat-assisted cutting of glasses were conducted. Brehm et al (1979) applied a slit-burner and a point burner as heaters to elevate the workpiece temperature as shown in figure 14. The slit burner has a slit which is at least as long as the workpiece.…”

Section: Heat Assisted Cuttingmentioning

confidence: 99%

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Micro-machining of optical glasses — A review of diamond-cutting glasses

Liu

Lee

2003

Sadhana

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In order to diamond-turn optical glasses to a nanometric surface finish, it is critical to determine the transition point from brittle mode to ductile mode. This paper presents various experimental techniques to study this transition and discusses the mechanism of the surface generation. It has been recognized that tool wear is a serious issue in diamond turning of glasses. Thus, research in future should be concentrated on this field to enable the technology to be applied in commercial production.

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Section: Heat Assisted Cuttingmentioning

confidence: 99%

“…At elevated temperatures, however, diamond transforms into graphite. Brehm et al (1979) conducted experimental studies on various tool materials. Among them, hafnium nitride was found to be by far the best tool material for this application due to its properties maintained in high temperatures.…”

Section: Heat Assisted Cuttingmentioning

confidence: 99%

Micro-machining of optical glasses — A review of diamond-cutting glasses

Liu

Lee

2003

Sadhana

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“…Initial studies used the increased plasticity of glass at elevated temperature. 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.…”

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%

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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Transparent single-point turning of optical glass:

Cited by 38 publications

References 3 publications

Micro-machining of optical glasses — A review of diamond-cutting glasses

Micro-machining of optical glasses — A review of diamond-cutting glasses

Ultraprecision ductile mode machining of glass by micromilling process

An experimental study of optical glass machining

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