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The ductile micro-grinding regime and the transition between the ductile and brittle material removal mechanism were studied by the variation of the maximum uncut chip thickness from 0.4 μm to 0.7 μm (Fig. 8). Three different zones were defined on the workpiece surface by micro side grinding of the inclined sample (Fig. 1 c).
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All the above researches indicate that the ductile regime removal can be achieved in the brittle materials' grinding as in the machining of the metallic materials. For the grinding of Si 3 N 4, the material removal in the machining zone is mostly a mixed-mode of ductile and brittle [ 11, 12 ].
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Ductile removal can be achieved in the grinding of a brittle material if the grit depth of cut employed is sufficiently small. The critical DOC may be estimated using …
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Materials Science. Journal of the American Ceramic Society. 2020. Indentation fracture models of ductile machining in hard and brittle materials are critically appraised. Relations obtained in a seminal study …
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The grinding technology parameters are confirmed in the first place. The grinding wheel linear velocity is from 36m/s to 54m/s and workpiece feed velocity is from 1000mm/min to 2500mm/min. The grinding depth is from 30μm to 70μm while the ductile-brittle transition depth is 0.5μm.
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Keywords: ductile-regime grinding; microgrinding, brittle materials, real-time control; specific energy; subsurface damage Introduction For many hard materials a transition from the brittle to the ductile grinding regime can be accomplished by precisely controlling the grinding in-feed rate.1'2 Ductile-regime grinding is rapidly becoming an ...
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Ductile-Regime Grinding of Brittle Materials. Published. January 1, 1997. Author(s) Kenneth Blaedel, John S. Taylor, Christopher J. Evans. Abstract Under appropriate conditions, brittle materials may be ground to produce surfaces with no observable fracture damage. This chapter reviews the techniques for producing such …
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Ductile-Regime Grinding Of Brittle Materials: Experimental Results And The Development Of A Model. Ductile-regime grinding is a new technology made possible …
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That is because the materials removed in ductile-brittle regime grinding, the percentage of plastic deformation material removal will decrease with the increasing of a gmax. When a gmax is larger than 2 μm, the line between ground surface and subsurface were covered with cracks, demonstrating the materials were removed completely in …
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Ductile regime machining is an alternative method for polishing of brittle materials to obtain a high quality surface finish by a ductile or plastic material removal …
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Abstract. Ductile regime turning is a new technology for obtaining a crack-free surface on brittle material. However, the fundamental obstacle for industrial application of this technology is diamond tool wear. This problem is difficult to solve for existing methods of turning with round-nosed tools due to limitation on tool feed.
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Ductile Grinding of Brittle Materials. January 2004. Ceramic Transactions 156:131-141. DOI: 10.1002/9781118407042.ch12. Authors: R.O. Scattergood. To read the …
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It is difficult to inspect large machined surfaces for the purpose of 97 Blackley and Scattergood-Ductile-regime machining mode/ for diamond turning of brittle materials 0 lo -3a * 00 i- ~ i 0.4 0.6 0.8 1 .0 1.2 2 -3 7/f, x 10 0.0 0.2 Fig 4 Graph showing a plot of the mode/ using 0.762 um tools with 0 - 70and -30rake angles establishing a ...
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In this paper, the kinematics and surface formation in wheel normal grinding process were presented firstly. Then, for hard and brittle materials, the maximum uncut chip thickness and ductile/brittle regime have been addressed by analysis of grinding mode and calculation of ductile/brittle transition critical depths.
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Empirical evidence has shown that grinding wheel characteristics significantly affect performance in the grinding of brittle materials. In this research a grit depth of cut model was developed based on a kinematic simulation of the grinding process. The model describes the relationships between grinding wheel parameters (grit size, …
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Grinding of (5) brittle materials under conditions that allow predominantly Fracture Energy jzf ductile material-removal is a new technology known as ductileConsequently, as the scale of machining decreases, plastic flow regime grinding, which is the subject of this paper. becomes an energetically more favorable material-removal mechanism.
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Bifano TG, Dow TA, Scattergood R O (1991) Ductile-regime grinding: a new technology for machining brittle materials. J Eng Ind 113(2):184–189. Article Google Scholar Liu Kui, Li XP, Liang SY (2007) The mechanism of ductile chip formation in cutting of brittle materials. Int J Adv Manuf Technol 33(9):875–884
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Ductile-regime machining is a promising technique for processing brittle materials. Although it has been widely investigated, there are few studies on the cutting force in the ductile-regime machining of brittle materials. This paper proposes a predictive cutting force model for ductile-regime machining of brittle materials, with an integration …
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Materials Science and Engineering Dept., North Carolina State University, Raleigh, NC 27695-7907 Search for more papers by this author Book Editor(s): Ahmad G. Solomah,
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To suppress cracks during the grinding of brittle materials, ductile‐regime grinding [1], which stems from a mechanical model based on ceramic indentation [2], is frequently employed. The concept of ductile-regime grinding indicates that there is a critical depth of cut (DOC) below which the grinding of brittle materials is similar to that …
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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 …
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The basic science of attendant deformation and removal modes in contact events is here analyzed and discussed in the context of brittle and ductile machining and severe and mild wear. Essentials of brittle–ductile transitions in micro- and nano-indentation fields are outlined, with distinctions between blunt and sharp contacts and …
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The brittle-ductile transition in the micro drill-grinding of hard brittle materials was investigated. A ductile regime propelling technology of a resin coating was proposed and successfully ...
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Ductile regime machining is an alternative method for polishing of brittle materials to obtain a high quality surface finish by a ductile or plastic material removal process. Hence, there is a growing interest to study ductile regime machining over several decades. This paper reviews current state of research and development in ductile …
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Micro grinding is catching an increasing concern in manufacturing industries from scholars all over the world. The researches on "Ductile-brittle" transition in micro-grinding of brittle materials are important to the machining results, and this transition process could be affected by various factors, such as micro grit-material interaction, …
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Abstract Indentation fracture models of ductile machining in hard and brittle materials are critically appraised. ... and of threshold grinding depths, suggest that caution should be exercised in unconditional usage. Notwithstanding these limitations, the value of the indentation fracture methodology in placing ductile machining on a sound ...
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The ductile–brittle transition and ductile-regime removal mechanisms of ZnS crystal, a typical soft-brittle infrared optical material, have remained unclear at the micro- and nanoscale. In this context, this study modeled the energies consumed in two machining modes, namely ductile deformation and brittle fracture, during the …
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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 …
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The process parameters (depth of cut, feed etc.) to achieve transition between ductile and brittle modes of material removal have been reported (Blake and Scattergood, 1990, Blackley and Scattergood, 1991, Patten et al., 2005) to be in the micrometer and nanometer regime. Hence ductile-regime machining is categorized as a precision or …
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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 …
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Subsequently, the ductile regime grinding of the microstructured surface was examined for WC cermet and BK7 optical glass. The ground surfaces mainly under the ductile regime material removal were successfully achieved, especially in the case of WC ceramic. ... The precision grinding of hard and brittle materials by a conditioned coarse …
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Ductile grinding of brittle materials is essential for high precision applications and to maintain the strength and lifetime of the parts. The critical chip …
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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.
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Grinding of brittle materials is characterized by a complex removal mechanism of both ductile and brittle removal. Therefore, the traditional force models, which are mainly targeted to metallic materials, cannot be fully applied to the force prediction of brittle materials. ... Ductile-regime grinding: a new technology for …
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The prediction of the critical depth for ductile grinding of brittle materials is of great importance for grinding process optimization and quality control. ... Predictive cutting force model for ductile-regime machining of brittle materials. Int J Adv Manuf Technol, 98 (1–4) (2018), pp. 781-790, 10.1007/s00170-018-2273-6. View in Scopus ...
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DMM can be realized in precision/ultraprecision turning, milling and grinding processes. In these processes, ductile and brittle modes may be induced in brittle materials and the transition between them can be reliably characterized by using appropriate ductile-brittle transition (DBT) mechanisms. The challenge lies in applying …
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