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Ductile regime grinding, proposed by Bifano, is an important method for achieving high quality surfaces of hard brittle materials . Bifano also gave a theoretical description of the ductile grinding condition of different brittle materials, pointing out that ductile-regime grinding could be achieved by a .
This process is known as ductile-regime grinding. When brittle materials are ground through a process of plastic deformation, surface finishes similar to those achieved in polishing or lapping are produced. Unlike polishing or lapping, however, grinding is a deterministic process, permitting finely controlled contour accuracy and complex shapes.
May 09, 2018· Thus, the predominant material-removal mechanism is plastic-flow rather than fracture. This process is known as ductile-regime grinding. When brittle materials are ground through a process of plastic deformation, a working surface similar to .
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 ...
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 ...
For the ductile mode grinding of hard and brittle materials, the critical machining depth ranges from 50 nm to 1 m [20]. To perform ductile mode machining of brittle materials, machine tools with high-accuracy servomechanisms (resolution 1.25–10 nm), high loop stiffness, and full flood
The ductile–brittle transition temperature (DBTT), nil ductility temperature (NDT), or nil ductility transition temperature of a metal is the temperature at which the fracture energy passes below a predetermined value (for steels typically 40 J for a standard Charpy impact test). DBTT is important since, once a material is cooled below the ...
Ductile materials are those which can be drawn into wires when tension is applied, And can be drawn into sheet when compressive load is applied For the above mentioned properties the material should have a tendency to elongate i.e for lower value...
Mar 29, 2006· Diamond turning, precision grinding, ductile regime machining, surface integrity. Ductile Machining of Brittle Materials. Hard and brittle materials such as glasses and ceramics are amongst the most difficult to machine.
AbstractA mirror-like grinding of brittle materials is required in many precision engineering regions. Ductile regime grinding, a new grinding technology for brittle materials, is considered as a s...
Ductile Regime Grinding: A New Technology for Machining Brittle Materials ... Kanai, A., and Miyashita, M., 1994, "Dressing of Metal Bonded Diamond Wheel by Use of Loose Abrasive Lapping for Ductile Model Grinding of Brittle Materials—Control Technology of Active Grain Protrusion," Proceedings of the ASPE Annual Meeting, pp. 92–95. 10 ...
The ability of VAM to machine brittle materials in the ductile regime at increased depth of cut is also described. ... Surface quality of workpiece during ceramic grinding is an ever-increasing ...
This process is known as ductile-regime grinding. When brittle materials are ground through a process of plastic deformation, surface finishes similar to those achieved in polishing or lapping are produced. Unlike polishing or lapping, however, grinding is a deterministic process, permitting finely controlled contour accuracy and complex shapes.
Dec 16, 2014· Ductile regime grinding is an effective machining process that has been used for brittle materials for several years now. In ductile regime grinding, material is removed through plastic deformation, which reduces the risk of fractures and compromised materials. Regime grinding also eliminates or minimizes the need for polishing and lapping ...
Jan 18, 2018· Materials can be named as ductile materials or brittle materials based on their response to an applied stress on them. The main difference between ductile and brittle materials is that ductile materials are able to be drawn out into thin wires whereas brittle materials .
Jan 29, 2018· 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 u n d e f o r m e d ) decreases to be sufficiently small, typically at submicron level [ 5, 6, 7 ].
1 November 1990 Ductile regime grinding of glass and other brittle materials by the use of ultrastiff ... William J. Wills-Moren, Keith Carlisle, Patrick A. McKeown, and Paul Shore "Ductile regime grinding of glass and other brittle materials by the use of ... high stiffness CNC grinding machines for ductile mode grinding... Proceedings of SPIE ...
May 05, 2018· In this study, ductile to brittle transition in ultra-micro-grinding (UMG) of hard brittle material is investigated. The characteristics of UMG process are studied, and differences between UMG and micro-grinding (MG) are investigated. The grain penetration depth considering rotary deviation is calculated, grain invalid cutting phenomenon is discussed, and the critical condition for grain ...
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 2006-01-01 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.
Ductile materials deform much more than brittle materials. Brittle materials fail suddenly, usually with no prior indication that collapse is imminent. On the other hand, ductile materials, such as structural steel, normally undergo a substantial deformation called yielding before failing, thus providing a warning that overloading exists.
This article addresses the problem of monitoring the material removal regime (ductile versus brittle) that occurs during the grinding of brittle materials. Often a ductile grinding regime is desired, but currently there is no way to measure the grinding ductility .
Ductile-Regime Grinding of Brittle Materials. Published. January 1, 1997. ... Under appropriate conditions, brittle materials may be ground to produce surfaces with no observable fracture damage. This chapter reviews the techniques for producing such surfaces and the mechanisms of material removal involved. ... ductile grinding, glass ...
Effect of Cutting-Edge Shape on Ductile Regime Grinding of Optical Glass in Single-Grit Diamond Grinding p.89. Ductile Regime Machining of Single-Crystal CaF 2 for Aspherical Lenses ... Brittle Material, CaF 2, Calcium Fluoride, Diamond Turning, ...
Ductile-Regime Turning of Brittle Materials by Single Point Diamond Ichiro Ogura, Yuichi Okazaki ... Blake and Scattergood investigated the critical depth of cut for single crystals of germanium ... T. Bifano, T. Dow, and R. Scattergood: Ductile Regime Grinding: A New Technology for Machining Brittle Materials. ASME, J. Eng. Ind., 113, 5 (1991 ...
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