(1997). Grinding Characteristics of Hard and Brittle Materials by ELID-Lap Grinding Using Fine Grain Wheels. Materials and Manufacturing Processes: Vol. 12, No. 6, pp. 1037-1048.

Ultrasonic vibration assisted face grinding (UAFG) has excellent performance in hard and brittle materials processing. In order to reveal the surface generating mechanism and improve the machining quality, this study was dealing with investigation on ultrasonic energy distribution and surface generating characteristics.

The investigation focuses on the effects of wheel speed, grinding depth, and apex angle of the abrasive grain on the SSD of brittle materials. It shows that when maximum undeformed chip thickness (M-UCT) is greater than the critical thickness of brittle fracture, the material removal is mainly in the brittle mode.

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.

The key issue of grinding brittle materials is to minimize this subsurface damage by following prescribed grinding parameters that will achieve the desired material removal rates and final dimensional accuracy. Ductile-regime grinding principle. When machined, a brittle material can deform via a variety of mechanisms.

OSTI.GOV Conference: Cryogenic grinding of brittle materials. Cryogenic grinding of brittle materials. Full Record; Other Related Research; Abstract ...

Ultrasonic-vibration-assisted grinding of brittle materials: A mechanistic model for cutting force. Na Qin, Z. J. Pei, W. L. Cong, C. Treadwell, D. M. Guo. ... of brittle materials is proposed for the first time. Fundamental assumptions include: (1) brittle fracture is the dominant mechanism of material removal, and (2) the removed volume by ...

Novel Kinematics for Cylindrical Grinding of Brittle Materials P. Koshy, Y. Zhou, C. Guo, R. Chand 55th CIRP General Assembly August 2005, Antalya, Turkey Work material: fused silica rods (GE Type 214 Quartz) 100 mm long; diameter reduced from 7 to 6.5 mm Wet; down grinding No spark-out Identical grinding cycle time between processes 1A1 ...

Ductile streaks produced during diamond grinding of hard and brittle materials have aided the subsequent process of polishing. Two novel techniques were used to …

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 ...

Fig.4-Fig.8 that the surface roughness of hard and brittle materials machined by UVG is lower than that machined by conventional grinding under same machining conditions. 3.2 Material removal rate (MRR) The material removal rate is mainly related to the feed rates of tool and workpiece in the plane grinding …

Therefore, how to get high-quality processing surface is a very important research theme in the field of advanced manufacturing engineering.In this thesis the experimental research on grinding of three kinds of typical brittle materials (silicon wafer, ceramics and stone) by …

Grinding of brittle materials will inevitably cause grinding damages characterized by fracture microcracks, which will greatly affect the grinding integrity. Traditional damage models are just ...

OSTI.GOV Conference: Working with the superabrasives industry to optimize tooling for grinding brittle materials

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 …

The grinding forces in ceramic coatings depend on the ratio of critical depth of cut (d c) and maximum depth of cut (h m ). A proposed force model for coating showed good correlation with experimental force values. The material removal mechanism is mainly by micro brittle fracture owing to small critical depth of cut.

The ultra-precision grinding technology directly obtains high surface quality for brittle materials when the grinding process is under the ductile mode. This paper introduces general aspects of ultra-precision grinding technology in the fabrication of the micro v-grooves structures and introduces the essential features of ultra-precision grinding.

Material Removal Normally, making chips is not con-sidered part of the grinding process, but that is exactly what happens when grinding ductile or brittle materials. In a brittle material, the "chips" are just smaller. The removal mecha-nism for a brittle material is achieved through micro-fracture and the sub-sequent removal of the chips ...

In this keynote paper, the characteristic features of hard and brittle materials are outlined. Considering these features, a fundamental principle for grinding those materials is discussed, followed by practical examples of advanced ceramic grinding. Remarks for attaining high-efficiency grinding of hard and brittle materials are presented.

Experimental and computational studies of the effects of actively cooled coolant for grinding brittle materials are carried out. The experimental results show that the use of actively cooled coolant is able to improve surface quality for up to 13.1% on average in terms of surface roughness Ra. The results of optical and SEM examinations ...

Precision Grinding of Hard and Brittle Materials Two cup-shapedidentical size diamond-grindingwheels with metallic (D20/30 MIC­ L50M-l/4) and resinoid (SD240-RIOOB69-6mm) bonding were used. The profile of the grinding edge is circular in this case, but not restricted to this shape, thus forming a toroid.

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 mode cutting is a very promising way to achieve high ...

A method of calculation of cutting forces at diamond grinding of brittle materials is proposed in article. The cutting forces: normal, tangential and fracture, acting to single grain are calculated.

Brazed diamond grinding tool is the most promising tool, which is fitter for powerful and high-efficiency grinding and may be the substitute of plated one in the future. But the research of the tool on brittle material grinding is still few. In the paper, it has been proved that the tool can achieve much better surface quality than any other tools, though large grit size is used in the tool ...

The ductile grinding of brittle materials for the manufacturing of components was studied. Control of the subsurface damage was one of the crucial factors for the machining operation of brittle ...

for Precision Grinding Brittle Materials in a Production Environment Pete J. Davis Mark A. Piscotty Kenneth L. Blaedel This paper was prepared for submittal to the American Ceramics Society Conference Indianapolis, IN April 26-27, 1999 April 1999 This is a preprint of a paper intended for publication in a journal or proceedings. ...

Blaedel, K., Evans, C. and Taylor, J. (1998), Ductile-Regime Grinding of Brittle Materials, Marcel Dekker, Inc., New York, NY (Accessed September 29, 2021)

The high hardness of brittle materials always make it hard to machine with traditional grinding wheels. Conventionally a diamond grinding wheels was used to improve the poor processing capability. Usually the specific grinding energy had been used as an indicator of machinability. According to its definition, the specific grinding energy increases with the active contact area of the grinding ...

In the grinding of hard and brittle materials, therefore, it becomes especially important to distinctly divide the process into two stages : roughing and finishing. Grinding with a large machining unit is suggested for rough grinding to keep 2 90.0 5.0 t A 2.0 n 0 1.0 0 0.5 .- 0 *400i m=14.9 om=lOMPa A ~400~ m=14.2 om=9.6MP( 0 ~200~ m=22.3 om=7 ...

Nano finish grinding of brittle materials using electrolytic in-process dressing (ELID) technique. Sadhana, 2003. Mustafizur Rahman. Download PDF. Download Full PDF Package. This paper. A short summary of this paper. 31 Full PDFs related to this paper. Read Paper. Download PDF.

It is well known that the strength of brittle materials such as glass depends on the loading rate and loading duration. Usually, glass, when loaded at a rapid rate or forced to support a given load for short time, is relatively strong. In reverse, it is relatively weak. Indentation techniques which ...

Abstract The applications of hard and brittle materials, typically represented by advanced ceramics, for a number of high-performance components have recently generated high interest. To meet this increasing demand, high efficiency machining technologies are needed. In this keynote paper, the characteristic features of hard and brittle materials are outlined.

Supplement Vo!. 12 No.2, 2004 Precision Grinding of Hard and Brittle Materials Fig. 2: High speed jig grinding of silicon and glass Two grinding wheel bond types, metal and resinoid, each with three different grit sizes, 10-30 mm, 40-60 mm and 50-70 mm were used in generating aspheric surfaces using the grinding zone method.

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 surfaces and the ...