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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 ...
Aug 07, 2013· The normal stress distribution profile associated with grinding a ductile material does not apply to grinding a brittle material like an advanced ceramic. Any induced tensile stress, which is usually caused by restricted thermal expansion at high temperatures, has already resulted in micro-cracking beneath the surface, as in a brittle material ...
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 ...
Cutting a groove with tilted angle was a common methodology for determining the deformation regime of brittle materials in ... R. O. Ductile-regime grinding: a new technology for machining brittle ...
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.
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 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...
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 ].
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 .
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 .
in the grinding of brittle materials. The results of this inves-tigation lend strong evidence in support of the ductile-regime grinding hypothesis. Also, a model is proposed, defining the brittle-to-ductile transition in terms of the material properties of the workpiece and the rate of material removal.
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 ...
Similarities and differences between ductile material and brittle material are provided in this article. At a particular temperature, a ductile material exhibits substantial plastic deformation under external loading, while a brittle material breaks with negligible plastic deformation under tensile stress.
2 Grinding of brittle materials Many advanced materials such as ceramics, silicon and optical glass are hard and brittle materials. Since 1980s, ductile regime grinding of brittle materials has been and is continuing to be an intensive research area because of its .
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 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 .
Ductile Regime Grinding Brittle Materials. Ductileregime grinding of brittle materials researchgate the compression applied on the workpiece at the shear plane if it is of the hydrostatic type the brittle material can be ground in ductile mode this also increases the depth of cut considerably.
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 ...
Feb 14, 2018· 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.
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.
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 ...
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.
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 ...
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.
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