ductile regime grinding brittle materials


Posted on December 18, 2018



Ductile-Regime Grinding: A New Technology for Machining Brittle .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 mechanism is plastic-flow and not fracture. This process is known as ductile-regime.ductile regime grinding brittle materials,Ductile-Regime Grinding Of Brittle Materials: Experimental Results .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.


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Specific grinding energy as an in-process control variable for ductile .

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 process.” A model is developed to describe the dependence of the.

Ductile-Regime Grinding: A New Technology for Machining Brittle .

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 mechanism is plastic-flow and not fracture. This process is known as ductile-regime.

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.

Ductile or Partial Ductile Mode Machining of Brittle Materials - NTU

grinding wheel [14]. When ductile mode machining of brittle materials is achieved, nanometre order surface roughness is obtained and subsurface damage . The regime in which the deformation takes place in the form of simple plastic flow is the favoured regime for ductile mode machining. [15]. The effects of the.

Specific grinding energy as an in-process control variable for ductile .

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 process.” A model is developed to describe the dependence of the.

ductile regime grinding brittle materials,

A review on the current research trends in ductile regime machining

Dec 22, 2017 . ing, lapping, and polishing, are based on grinding or abra-. sive process, which always generated microcracks and. subsurface damage. Ductile regime machining method is. an alternative method for machining of brittle materials to. obtain a high quality crack-free surface finish by a ductile or.

Surface Integrity Control During The Precision Machining Of Brittle .

AZoJomo - The AZO Journal of Materials Online - Surface and sub-surface damage on. Figure 7. Surface and sub-surface damage on ground BK7 glass showing ductile/brittle transition and zero sub-surface damage within ductile grinding regime.

Ductile and brittle transition behavior of titanium alloys in ultra .

Mar 2, 2018 . This paper aims to reveal the ductile to brittle transition regime of titanium alloys in UPM and shows the effects of depth of cut on the critical cutting distance and the ductile to brittle ... Bifano, T. G., Dow, T. A. & Scattergood, R. O. Ductile-regime grinding: a new technology for machining brittle materials.

Ductile Mode Material Removal of Ceramics and Semiconductors

their high hardness, brittle characteristics and poor machinability. However, ductile regime machining of these materials is possible due to the high-pressure phase .. 2.2: A ductile machining model of brittle materials showing. .. polishing, grinding, laser machining, and diamond turning are being used today in an.

Cost Effective Machining of Brittle Materials - Cranfield Precision

Ductile regime grinding can be used to provide a damage free surface. Cranfield. Precision carried out comprehensive grinding research on a number of different brittle materials and confirmed that there exists a transition "depth of cut' from ductile to brittle mode fracture with depths of cut of around 0.1um. This transition.

i PREDICTIVE MODELING FOR DUCTILE MACHINING OF BRITTLE .

(1991) reported ductile regime grinding results for various materials such as fused silica, soda lime glass, zerodur, quartz, zirconia, germanium, silicon and silicon carbide. Yoshino et al. (2005) developed a machining device to carry out precision machining experiments under external hydrostatic pressure. The authors.

experimental investigation of hard and brittle materials machining .

postulated a hypothesis about ductile regime grinding that all materials, regardless of their hardness or brittleness will undergo a transition from brittle machining regime to a ductile machining regime if the grinding rate is made small [42]. Figure 2.4: Ductile regime machining [43]. Figure 2.4 shows the three different zones.

Study of Ultra-precision Finishing Techniques for Brittle Materials

The advancements in grinding system include new abrasives, new bonding methods and lubricants. The mechanism of material removal is at the borderline of brittle to ductile transition. For the better quality of the product, it is very important that the ultra-precision machines should be precise, smooth, vibration and backlash.

Ductile Regime Machining of Germanium at Varying Depth of Cut .

Ductile regime machining helps to obtain a crack-free surface on brittle material i.e. germanium, silicon, silicon carbide. . C. Jiang, J. Xu, C. Wang, Experimental investigation of subsurface damage of optical glass in precision grinding using a brittle material removal fraction, The International Journal of Advanced.

MACHINING OF TRANSPARENT BRITTLE MATERIAL BY . - K-REx

In the 1970s improvements in precision grinding brought about a wide range of brittle materials machined in a ductile manner [19]. In the 1990's precision machining methods such as microturning and micromilling evolved, marking the beginning of ductile regime machining (DRM) techniques. DRM was meant to achieve.

A review on ductile mode cutting of brittle materials - Frontiers Journals

Mar 1, 2018 . 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 mode cutting is a very promising way to achieve high quality and crack-free surfaces of brittle materials. Thus the.

Analysis of the Material Behavior of Cemented Carbides (WC . - Core

When grinding multi-phase, brittle materials like cemented carbides consisting of a soft binder matrix (Co) and hard grains (WC), a transition from brittle to ductile regime grinding has been proven scientifically. The phase fractions and the mesostructure of these materials have a significant impact on the material behavior.

Brittle–ductile transition during diamond turning of single crystal .

offered by SiC resulting in the observation of significant wear marks on the cutting tool just after 1. Km of cutting length. It was found out through a DXR Raman microscope that similar to other classical brittle materials (silicon and germanium etc.) an occurrence of brittle-ductile transition is responsible for the ductile-regime.

ductile regime grinding brittle materials,

In this work a series of experiments revealed the . - CiteSeerX

4 Syn C, Taylor J, Donaldson R, Shimada S. Ductile-brittle Transition of Cutting Behavior in Diamond. Turning of Single Crystal Silicon. LLNL UCRL-98100, 1988. 5 Bifano T, Dow T, Scattergood R. Ductile-regime grinding of brittle materials: experimental results and development of a model. In: Proceedings of the SPIE:.

ductile regime grinding brittle materials,

Cost-Effective Grinding of Zirconia Using the Dense Vitreous Bond .

It could be explained by ''ductile regime'' grinding. 10 in which the brittle material grinds like ductile metals. The other three grinding conditions do not show chip formation as clearly as in Fig. 7a . Figures 7e and 7f show debris gener- ated by the diamond wheel. The two sets of process parameters are the same as those in.

Ductile Regime Machining of Silicon Nitride - Third Wave Systems

Recent research on precision machining of brittle materials has indicated that, under certain controlled conditions, ductile regime material removal of ceramics is possible at low depths of cut and high pressures [1]. An advantage of ductile machining over brittle machining is the minimal subsurface damage with a surface.

Analytical modeling of ground surface topography in .

In the model, the ductile-regime effect is considered by determining grain-workpiece interaction mode (ductile and brittle modes) at each grinding moment. . therefore is anticipated to be not only meaningful to guide and optimize the industrial silicon grinding process, but also transferable to other kinds of brittle materials.

Atomistic insights on the nanoscale single grain scratching .

The precision and crack-free surface of brittle silicon carbide (SiC) ceramic was achieved in the nanoscale ductile grinding. However, the . T. G. Bifano, T. A. Dow, and R. O. Scattergood, “Ductile regime grinding: A new technology for machining brittle materials,” Journal of Engineering for Industry 113, 184–189 (1991).

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