Diamond Turning of Brittle Materials for Optical Components

Nakasuji, Tomoaki; Kodera, Sunao; Hara, Seiichiro; Matsunaga, H.; Ikawa, Naoya; Shimada, Shoichi

doi:10.1016/s0007-8506(07)61009-9

Cited by 238 publications

(111 citation statements)

References 2 publications

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“…Many studies have been developing into understanding the brittle-ductile transition phenomenon and revealing their mechanism. One view of brittle-ductile transition is based on cleavage fracture due to pre-existing flaws [28]. Also, a larger DoC would definitely result in a larger UCT, which may cause the material removal in the brittle-ductile transition manner.…”

Section: Ductile Mode Cutting Mechanismmentioning

confidence: 99%

“…Also, a larger DoC would definitely result in a larger UCT, which may cause the material removal in the brittle-ductile transition manner. Nakasuji et al [28] and Shimada et al [22] proposed a possible material removal mechanism, which can be classified into two modes in cutting of brittle materials. One is due to plastic deformation in the characteristic slip direction and another is due to brittle fracture on the characteristic cleavage plane.…”

Section: Ductile Mode Cutting Mechanismmentioning

confidence: 99%

“…9 [57]. Nakasuji et al [28] achieved a surface roughness value of less than 20 nm on optical materials by diamond turning. The surface roughness R max of 20 nm was achieved at a DoC of 100 nm in cutting of silicon using a large negative rake angle [58].…”

Section: Surface Finishmentioning

confidence: 99%

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A review on ductile mode cutting of brittle materials

2018

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Brittle materials have been widely employed for industrial applications due to their excellent mechanical, optical, physical and chemical properties. But obtaining smooth and damage-free surface on brittle materials by traditional machining methods like grinding, lapping and polishing is very costly and extremely time consuming. Ductile mode cutting is a very promising way to achieve high quality and crack-free surfaces of brittle materials. Thus the study of ductile mode cutting of brittle materials has been attracting more and more efforts. This paper provides an overview of ductile mode cutting of brittle materials including ductile nature and plasticity of brittle materials, cutting mechanism, cutting characteristics, molecular dynamic simulation, critical undeformed chip thickness, brittle-ductile transition, subsurface damage, as well as a detailed discussion of ductile mode cutting enhancement. It is believed that ductile mode cutting of brittle materials could be achieved when both crack-free and no subsurface damage are obtained simultaneously.

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Section: Ductile Mode Cutting Mechanismmentioning

confidence: 99%

Section: Ductile Mode Cutting Mechanismmentioning

confidence: 99%

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A review on ductile mode cutting of brittle materials

2018

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“…Moreover, single point diamond turning, which is flexible to make precise and complex micro/nano features on a lens surface, is not suitable for the most needed optical material, the Sibased optical glass. This is because silicate optical glass can easily produce severe cleavages and microchipping on a diamond tool surface and therefore bring about tool wear [34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Precision glass molding: Toward an optimal fabrication of optical lenses

Zhang

Liu

2017

Front. Mech. Eng.

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It is costly and time consuming to use machining processes, such as grinding, polishing and lapping, to produce optical glass lenses with complex features. Precision glass molding (PGM) has thus been developed to realize an efficient manufacture of such optical components in a single step. However, PGM faces various technical challenges. For example, a PGM process must be carried out within the super-cooled region of optical glass above its glass transition temperature, in which the material has an unstable non-equilibrium structure. Within a narrow window of allowable temperature variation, the glass viscosity can change from 10 5 to 10 12 Pa$s due to the kinetic fragility of the super-cooled liquid. This makes a PGM process sensitive to its molding temperature. In addition, because of the structural relaxation in this temperature window, the atomic structure that governs the material properties is strongly dependent on time and thermal history. Such complexity often leads to residual stresses and shape distortion in a lens molded, causing unexpected changes in density and refractive index. This review will discuss some of the central issues in PGM processes and provide a method based on a manufacturing chain consideration from mold material selection, property and deformation characterization of optical glass to process optimization. The realization of such optimization is a necessary step for the Industry 4.0 of PGM.

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“…Entretanto materiais frágeis têm sido usados por uma variedade de equipamentos em que são incorporados produtos ópticos, onde freqüentemente são exigidas formas anesféricas (NAKASUJI et al, 1990). Porto et al (2004), apresenta na Tabela 4 uma lista de materiais frágeis que podem ser usinados com ferramenta de diamante, onde são incorporados novos materiais que estão relacionados principalmente à óptica de transmissão.…”

Section: Fonte: Taniguchi (1994)unclassified

Avaliação da integridade superficial do polimetilmetacrilato (PMMA) no torneamento com ferramenta de diamante

Granado¹

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Diamond Turning of Brittle Materials for Optical Components

Cited by 238 publications

References 2 publications

A review on ductile mode cutting of brittle materials

A review on ductile mode cutting of brittle materials

Precision glass molding: Toward an optimal fabrication of optical lenses

Avaliação da integridade superficial do polimetilmetacrilato (PMMA) no torneamento com ferramenta de diamante

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