A review on the current research trends in ductile regime machining
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 …
Experimental investigation on materials removal mechanism …
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 …
Ductile-Regime Grinding: A New Technology for Machining Brittle Materials
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.
Predictive modeling of transition undeformed chip thickness in ductile
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 …
Micromechanics of machining and wear in hard and brittle materials …
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 …
Ductile-Regime Grinding of Brittle Materials
GRINDING OF SILICON AND GLASS USING A NEW DRESSING DEVICE AND AN IMPROVED COOLANT SYSTEM. Ductile mode machining of brittle materials such as …
Ductile-Regime Grinding: A New Materials T. G. Bifano
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.
An analytical force and energy model for ductile-brittle …
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 ...
Material removal mechanisms in precision machining of new materials
Ductile regime machining follows from the fact that all materials will deform plastically if the scale of deformation is very small. Another way of viewing the ductile regime machining problem is that described by Miyashita [17], as shown in Fig. 5.The material removal rates for grinding and polishing are compared and there is a gap in …
Ductility-oriented high-speed grinding of silicon carbide
Grinding of brittle materials is always a removal process of coexisting ductile and brittle removal modes. Ductility-oriented grinding has been regarded as a precision machining pursuit for grinding quality and efficiency. This paper is devoted to investigating ductility-oriented grinding mechanism and process design for quality …
Ductile Grinding of Brittle Materials
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,
Effect of friction coefficient on chip thickness models in ductile
The removal of material in the ductile regime while improving machining efficiency is currently the technical bottleneck in grinding zirconia ceramics. Prediction models of minimum chip thickness (hmin) and ductile–brittle transition chip thickness (hd–b) were developed according to grinding mechanism. Results showed that both …
Ductile-brittle transition mechanisms in micro …
Ductile grinding of brittle materials is essential for high precision applications and to maintain the strength and lifetime of the parts. The critical chip …
Influence of the Grinding Wheel in the Ductile Grinding of Brittle …
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, …
Ductile to brittle transition in ultra-micro-grinding (UMG) …
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 …
A predictive model of subsurface damage and material …
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
Ductile-brittle transition mechanisms in micro-grinding of …
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).
Ductile-regime grinding of brittle materials: experimental …
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 …
Ductile-Regime Grinding: A New Technology for …
Because of recent advances in precision engineering that allow controlled grinding infeed rates as small as several nanometers per grinding wheel revolution, it is possible to grind brittle materials so that the predominant material-removal …
Ductile Grinding of Brittle Materials
Ductile Grinding of Brittle Materials. January 2004. Ceramic Transactions 156:131-141. DOI: 10.1002/9781118407042.ch12. Authors: R.O. Scattergood. To read the …
Ductile-Regime Grinding of Brittle Materials | NIST
Abstract. Under appropriate conditions, brittle materials may be ground to produce surfaces with no observable fracture damage. This chapter reviews the …
Ductile-regime machining model for ultrasonic elliptical …
During ordinary cutting, if UCT is smaller than the critical value (t c), crack-free surface on brittle materials can be achieved, which is normally termed as ductile machining [14].For UEVC of brittle materials, as UCT gradually increases from zero to a maximum value (UCT m) as shown in Fig. 1, if UCT m is maintained no larger than t c …
Ductile regime turning at large tool feed
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.
Towards understanding the crack suppression mechanism in brittle …
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 …
Ductile regime grinding of silicon nitride ceramics based on …
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 ].
Ductile-Regime Grinding of Brittle Materials | NIST
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 …
Ductile-Regime Machining of Germanium and Silicon
Special attention was directed to the so-called ductile regime wherein optical quality surface finishes can be machined directly on brittle materials. A novel interrupted-cutting test and a new model of the machining process were used to measure a critical-depth parameter experimentally.
An analytical force and energy model for ductile-brittle …
Huang et al. [26] proposed a force prediction model for ductile-regime machining of brittle materials, which accounted for three material removal modes, i.e., ploughing effect, plastic deformation and brittle fracture. Zhang et al. [27] analyzed the grinding mechanism of the ductile stage, DBT stage, and brittle stage, and proposed a ...
Ductile-Regime Grinding Of Brittle Materials: …
Ductile-Regime Grinding Of Brittle Materials: Experimental Results And The Development Of A Model. Ductile-regime grinding is a new technology made possible …
An analytical force and energy model for ductile …
Abstract. The critical grinding depth of ductile-brittle transition is an important processing parameter to guarantee brittle materials machining in ductile …