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Ductile streaks produced during diamond grinding of hard and brittle materials have aided the subsequent process of polishing. Two novel techniques were used to study the formation of ductile …

Difference Between Ductile and Brittle | Definition ...

Ductile-regime grinding is a new technology made possible by the use of real-time control and precision engineering in the grinding process. By ensuring that the abrasive grinding forces do not exceed a threshold value, it is possible to grind materials that are normally considered "brittle" in such a way that the material removal takes place through plastic deformation rather than fracture.

Cleavage Fracture of Brittle Semiconductors from the ...

Jul 22, 2014· Introduction Background and Scope of Ductile Mode Machining of Glass Glass - a brittle material. Very difficult to machine material. Functional material for optics and electronics. Conventional grinding process causes surface damages. For better surface finish glass must be machined in ductile …

A review on the current research trends in ductile regime ...

The brittle mode or ductile mode is confirmed when a brittle material is machined. These two modes are distinguished according to whether cracks or damage occur in the machined surface. In this study, four machining types comprising subdivisions of ductile and brittle modes were defined to provide detailed descriptions of the experimental results.

Ductile

As a means to realize ductile regime grinding of an optical glass, a truncation method in which diamond cutting edges are truncated to be aligned on the grinding wheel surface is focused on in order to optimize the truncation conditions. The results are summarized as follows.1. Three-dimensional shape of diamond grain cutting edges was measured using a scanning laser microscope and it is found ...

Ductile or partial ductile mode machining of brittle materials

In ultraprecision grinding of brittle materials, the transition from ductile-regime grinding to brittle-regime grinding that results from an increasing grinding grain depth of cut is accompanied by a reduction in the specific grinding energy. Furthermore, as the grain depth of cut is increased beyond the transition point into purely

The mechanism of ductile chip formation in cutting of ...

brittle-to-ductile transition in terms of the material properties of the workpiece and the rate of material removal. In this paper, three aspects of the research are described: 9 Development of a grinding apparatus capable of ductile-regime grinding on brittle materials. The relevant design features include: — Machine configuration

Mechanism of Unstable Material Removal Modes in Micro ...

1 November 1990 Ductile regime grinding of glass and other brittle materials by the use of ultrastiff machine tools William J. Wills-Moren, Keith Carlisle, Patrick A. McKeown, Paul Shore

Effect of cutting edge truncation on ductile

Xue Li, Study of the material removal mechanism of glass-ceramics based on consecutive incremental loading in ductile-regime grinding, Nanotechnology and Precision Engineering, 10.1016/j.npe.2020.02.002, (2020).

Ultraprecision machining of micro

for ductile regime machining. 19,20. Similar results have been reported for the grinding process when machin-ing microstructured surfaces on brittle materials. 12. A45inclination angle was used successfully to machine several different surface structures in ductile mode on brittle materials…

Grinding | Fracture | Dislocation

Large aperture lenses which are used for single-lens reflex cameras and television cameras are manufactured by polishing requiring sufficient removal amount with a few micrometer depth to rid micro clacks completely after ultra-precision grinding. However, a prolonged polishing deteriorates the shape of the lens, which is accurately produced by the grinding process.

Ductile and brittle transition behavior of titanium alloys ...

Ductile-regime grinding is a new technology made possible by the use of real-time control and precision engineering in the grinding process. By ensuring that the abrasive grinding forces do not exceed a threshold value, it is possible to grind materials that are normally considered "brittle" in such a way that the material removal takes place through plastic deformation rather than fracture.

The 'skin effect' of subsurface damage distribution in ...

Jan 01, 2006· Effect of cutting edge truncation on ductile-regime grinding of hard and brittle materials Effect of cutting edge truncation on ductile-regime grinding of hard and brittle materials Kang, Xijun ; Tamaki, Jun'ichi ; Kubo, Akihiko 00:00:00 Cutting edge truncation is a micro-truing process in which the diamond cutting edges of a grinding wheel are truncated and aligned at the same height.

T. G. Bifan o Department of Aerospace and Mechanical ...

the first to propose the 'ductile-regime' machining technique for brittle materials to achieve high-quality grinding. Although 'ductile-regime' machining has received much attention, it is still controversial as it lacks both theoretical and experimental support. This technique is mainly concerned

The 'skin effect' of subsurface damage distribution in ...

tion takes place in the ductile regime, a defect-free nano-surface is possible and it completely eliminates the polishing process. ELID is one of the processes used ... Nano finish grinding of brittle materials using ELID 961 grinding wheel therefore remains constant. This cycle is repeated during the grinding …

Online force control of large optical grinding machine for ...

[1] Bifano T G, Dow T A, Scattergood R O. Ductile-regime grinding: a new technology for machining brittle materials[J]. Journal of Engineering for Industry, 1991Annals-Manufacturing Technology, (1994). DOI: 10.1115/1.

CiteSeerX — Materials

The ability to predict the critical depth for ductile-mode grinding of brittle materials is important to grinding process optimization and quality control. The traditional models for predicting the critical depth are mainly concerned with the material properties without considering the operation parameters.

Ductile regime grinding of glass and other brittle ...

A theoretical analysis for the mechanism of ductile chip formation in the cutting of brittle materials is presented in this paper. The coexisting crack propagation and dislocation in the chip formation zone in the cutting of ductile materials are examined based on an analysis of the geometry and forces in the cutting region, both on Taylor's dislocation hardening theory and the strain ...

Strain Rate Effect on the Ductile Brittle Transition in ...

Grinding characteristics in high speed grinding of. · Grinding characteristics in high speed grinding of engineering ceramics with brazed diamond wheels. in ductile regime grinding of brittle materials has shown that if the maximum undeformed chip thickness of individual abrasive grit is less than a critical depth of penetration that causes brittle fracture in a material, then the ...

Specific grinding energy as an in

the first to propose the 'ductile-regime' machining technique for brittle materials to achieve high-quality grinding. Although 'ductile-regime' machining has received much attention, it is still controversial as it lacks both theoretical and experimental support. This technique is mainly concerned

Recent developments in grinding of advanced materials

Dec 01, 2018· Ultrasonic elliptical vibration cutting (UEVC) is attracting much attention in ultra-precision machining of brittle materials as it was found be able to effectively increase the critical depth of cut (d c) of brittle materials.However, the mechanisms for the increased d c are still not fully understood. In this study, a ductile-regime machining model was developed for the UEVC of brittle ...

Specif ic grinding energy as an in

1. Introduction. Brittle–ductile cutting mode transition is an important phenomenon in the ultra-precision machining of brittle materials [1,2,3,4].Almost all the brittle materials could be machined in the ductile mode when the undeformed chip thickness (t undeformed) decreases to be sufficiently small, typically at submicron level [5,6,7].The mechanism of brittle–ductile cutting mode ...

Nano finish grinding of brittle materials using ...

3. B. K. A. Ngoi and P. S. Sreejith,"Ductile Regime Finish Machining – A Review" 4. H. Yoshikawa, Brittle–ductile behavior of crystal surface in finishing, Journal of JSPE 35 (1967) 662–667 5. Nakamura, Tsunetaka Sumomogi and Takayuki Goto, "Study on Ductile Mode Grinding of Brittle Materials using Single Abrasive Grain" 6.

Prediction of subsurface damage depth of ground brittle ...

The brittle mode or ductile mode is confirmed when a brittle material is machined. These two modes are distinguished according to whether cracks or damage occur in the machined surface. In this study, four machining types comprising subdivisions of ductile and brittle modes were defined to provide detailed descriptions of the experimental results.