experimental design was developed and applied to the ultra-high precision grinding of BK7 glass. A high sampling acoustic emission monitoring system was implemented to monitor the process. The research tends to monitor the ultra-high precision grinding of BK7 glass using acoustic emission which has proven to be an effective sensing

ELID for SiC which enables the improvement of surface quality is put forward. ELID grinding technology is new technology of ultra-precision grinding, and the oxide film is formed on grinding wheel by electrolytic in-process technology, thus the wheel is in-process dressed. SiC material removal mechanism and ELID grinding mechanism is analyzed, the character and condition of brittle to ductile ...

Finally, the experiments of wafer grinding were carried out on an ultra-precision grinder (VG401MKII), and the developed model is verified to be correct by comparing the experiment results and ...

In this paper, the ultra-precision mirror polishing technology was adopted for mirror processing experimental study of Aluminum Alloy mobile phone shell. The experiments show that: polishing pressure, Grinding disc speed, the texture and hardness of polishing pad and abrasive particle size are the main factors to affect the surface quality.

ultra-precision grinding wheel in this study. The differ-ences in microscopic morphology, structural strength, and surface hardness between the sol-gel diamond wheel and the hot pressing diamond wheel were com-pared. The influence of grinding process parameters including grinding speed, feed rate, and grinding depth

In this study, a novel ultra-precision grinding method assisted by CeO 2 chemical reaction is proposed and its performance is experimentally evaluated. The results show that crackless surface can be successfully obtained over the entire surface at three times higher tool feed rate, compared with conventional grinding without CeO 2 assistance.

1) super high speed NC precision grinding. . 2) ultra-high speed precision grinding. . 1. Physics models of molecular dynamics simulation of ultra-high speed precision grinding process are established. , …

For a given MRR Q w, the power drawn by a nanostructured grinding wheel is a composition of the power required to cut the material, P c (which is a property of the material that signifies the onset of cutting: interaction 1.1 in Fig. 1), the friction effects caused by the grinding wheel rubbing the surface, P f (t), which generates loading of ...

In this study, a novel ultra-precision grinding method assisted by CeO2 chemical reaction is proposed and its performance is experimentally evaluated. The results show that crackless surface can be successfully obtained over the entire surface at three times higher tool feed rate, compared with conventional grinding without CeO2 assistance.

The demand for large aperture lenses with high surface quality and form accuracy used for single-lens reflex cameras has been increasing. Generally, large aperture glass lenses are produced by ultra-precision grinding. Considering the increasing global competition, the grinding process has to …

Consequently, the simulation study of roughness generated for Brass 6040 and AISI 1045 steel under a wide range of cutting conditions using the pre-developed model is discussed. After that, the optimization of the ultra- precision turning process is given. Finally, conclusion is given in the last section.

Experimental study on surface integrity and subsurface damage of fused silica in ultra-precision grinding Yaoyu Zhong,1,2 1,2, Dai,1,2,* Hang Xiao, 3 and Feng Shi1,2 1Laboratory of Science and Technology on Integrated Logistics Support, College of Intelligence Science and Technology, National University of Defense Technology, 109 Deya Road, Hunan, 410073, China

grinding process. In order to reduce the amount of polishing, ductile-mode ultra-precision grinding is demanded. In this study, The rubber-bonded wheel were employed to enhance the grinding performance. Natural rubber and chloroprene rubber bonded wheels, which have different

Ultra-precision grinding is an effective method to machine the optical micro v-groove, which is one of microstructures applied to the fiber-optics connectors, displays and other photonics devices. The ultra-precision grinding technology directly obtains high surface quality for brittle materials when the grinding process is under the ductile mode.

download case study About The Company Founded in 1972, R & L Spring Company is a manufacturer of compression springs that are used for a variety of applications from miniature springs for the medical industry, to springs for a variety of automotive applications, to large clutch and suspension springs for recreational and commercial vehicles.

A study of the ultra precision grinding process on a magnetic disk substrate-development of new bonding materials for fixed abrasives of grinding stone, Wear 195 (1996) 74-80. DOI: 10.1016/0043-1648(95)06792-2

Engineering partnerships with Cranfield Precision. Located in Bedford, UK, Cranfield Precision® teams have over 50 years of experience in precision machine design and manufacture of world-leading ultra-precision machines. The business area encompasses ultra-precision machine tools, precision measuring systems and custom designed special purpose machines.

Besides challenges in process control and grinding wheel preparation, there is a growing demand for machine tools with high loop stiffness and grinding spindles dedicated to ultra-precision grinding. In summary, it may be predicted, that in the future ultra-precision grinding will become even more reliable, faster and versatile and will conquer ...

The purpose of this report is to develop the new bonding resin for fixing 3–41 μm SiC abrasives in grinding stone that generates the ultra precision surface on high-purity aluminium alloy. An aluminium disk substrate is processed by a double-sided lapping machine on which the grinding stone is mounted.

Optical coherence tomography (OCT) is an imaging technique that uses low-coherence light to capture micrometer-resolution, two- and three-dimensional images from within optical scattering media (e.g., biological tissue). It is used for medical imaging and industrial nondestructive testing (NDT). Optical coherence tomography is based on low-coherence interferometry, typically employing near ...

Dear Colleagues, Ultra-precision machining is a multi-disciplinary research area that is an important branch of manufacturing technology. It targets achieving ultra-precision form or surface roughness accuracy, forming the backbone and support of today's innovative technology industries in aerospace, semiconductors, optics, telecommunications, energy, etc.

Ultra-precision grinding was introduced as a semi-finishing process before CMP of hard and brittle materials to reduce CMP polishing time, 9 Kim and Lee 10 found that a finer super-abrasive wheel could obtain the mirror-like grinding surface of MgO single crystals, Ren et al. 11 carried out a side grinding experiment of single-crystal silicon ...

The ultra-precision grinding of fused glass using a relatively big diamond grain wheel and a large grinding depth can be realized through the assisted axial-feed grinding by the pure CeO 2 atomizing liquid. Theoretical model and experimental result show that the obtained surface roughness is mainly influenced by the feed speed and is little ...

Electrorheological (ER) polishing, as a new ultra-precision super-effect polishing method, provides little damage to the workpiece surface and is suitable for polishing all kinds of small and complex curved surface workpieces. In this paper, an ER polishing tool with an annular integrated electrode is developed. The orthogonal experiments are carried out on the six influencing factors of ER ...

In the grinding experiment, the threshold values of the grinding force were 120N and 60N with 600# and 2000# diamond grinding respectively.(4) At last, in order to study the basic mechanism of the ultra precision grinding technology on silicon wafer, single diamond abrasive scratching and self rotating grinding experiment were conducted on the ...

A study of the fabrication of v-groove structure in ultra-precision milling: Authors: Wang, S To, S Chen, X Wang, H Xia, H: Issue Date: 2014: Source: International journal of computer integrated manufacturing, 2014, v. 29, no. 4, p. 764-775: Abstract: V-groove structure is the key component for the alignment of fibres in the fibre array connector.

The grinding experiments were carried out on a horizontal type ultra-precision grinding machine as shown in Fig. 2 (a) (Eda, et al., 2001). The grinding machine was equipped with two aerostatic spindles for work and wheel rotation, and had two degrees of freedom along X- and Z-axis directions. In addition, the work spindle was able to be precisely

ELSEVIER WEAR Wear 195 (1996) 74-80 A study of the ultra precision grinding process on a magnetic disk substrate-development of new bonding materials for fixed abrasives of grinding stone Y. Tomita a, H. Eda b Graduate school of lbaraki University, 4-12-I Nakanarusawa-machi -shi, Ibaraki, Japan b Department of System Engineering, Faculty of Engineering, Ibaraki …

The micro-grinding technique combines precision micro-truing and ultra-precision fine grinding. The minimum wheel tip radius of 8.2μm was achieved using the grinding wheel #4000 by the micro ...

The demand for large aperture lenses with high surface quality and form accuracy used for single-lens reflex cameras has been increasing. Generally, large aperture glass lenses are produced by ultra-precision grinding. Considering the increasing global competition, the grinding process has to be improved. However, highly efficient grinding causes worse surface quality, which leads to much ...

Cranfield Precision engineers developed a solution that takes the optical molds surface design and generates the necessary grinding operations for the freeform and complex geometries. Tooling is carefully designed, selected and then tested in our ultra-precision machining lab. The complex and freeform optical molds are ground using unique ...