An Experimental Investigation of Optimal Grinding Condition for Aspheric Surface Lens Using Full Factorial Design

2007 ◽  
Vol 329 ◽  
pp. 27-32 ◽  
Author(s):  
Seung Yub Baek ◽  
Jung Hyung Lee ◽  
Eun Sang Lee ◽  
H.D. Lee
Keyword(s):  
Surface Roughness ◽  
Ground Surface ◽  
Diamond Wheel ◽  
Aspheric Surface ◽  
Precision Grinding ◽  
Spherical Lens ◽  
Ultra Precision ◽  
Ground Surface Roughness ◽  
Grinding System ◽  
Micro Lens

To enhance the precision and productivity of ultra precision aspheric surface micro lens, the development of ultra-precision grinding system and process for the aspheric surface micro lens are described. In this paper, an ultra-precision grinding system for manufacturing the aspheric surface micro lens was developed by considering the factors affecting the grinding surface roughness and profile accuracy. This paper deals with the mirror grinding of an aspheric surface micro lens by resin bonded diamond wheel and with the spherical lens of BK7. The optimization of grinding conditions with respect to ground surface roughness and profiles accuracy is investigated by design of experiments.

Dressing of Monolayer Brazed Diamond Wheel for Grinding Li-Ti Ferrite

2010 ◽  
Vol 126-128 ◽  
pp. 995-1000 ◽  
Author(s):  
Hong Hua Su ◽  
Yu Can Fu ◽  
Jiu Hua Xu ◽  
Wen Feng Ding ◽  
Hong Jun Xu
Keyword(s):  
Surface Roughness ◽  
Material Removal ◽  
Removal Rate ◽  
Ground Surface ◽  
Diamond Wheel ◽  
Substantial Improvement ◽  
Precision Grinding ◽  
High Roughness ◽  
Grinding Operations ◽  
Ground Surface Roughness

The monolayer brazed diamond tools have recently been used increasingly in hard-brittle materials grinding because of their excellent grinding performances as long tool life, high material removal rate and large inter-grit chip space, etc. However, they possess an inherent shortcoming of the high roughness of the grinding surface. This work is an attempt to reduce the over-protruded grits of the monolayer brazed diamond wheel so that precision grinding operations can be executed effectively. In this investigation, the monolayer brazed diamond wheels with regular distribution pattern of grit have been dressed by a special conditioning process and used in precision grinding experiments on Li-Ti ferrite. The outcome of this attempt appeared highly encouraging. A substantial improvement of the ground surface roughness could be achieved with the dressed monolayer brazed diamond wheels.

Development of Electroplated CBN Wheel with Cemented Carbide Base for Precision Grinding of Compressor Cylinder Vane Slot

2007 ◽  
Vol 329 ◽  
pp. 495-500
Author(s):  
Hang Gao ◽  
W.G. Liu ◽  
Y.G. Zheng
Keyword(s):  
Surface Roughness ◽  
Ground Surface ◽  
Cemented Carbide ◽  
Grinding Wheel ◽  
Precision Grinding ◽  
Base Surface ◽  
Compressor Cylinder ◽  
Cbn Wheel ◽  
Micro Holes ◽  
Ground Surface Roughness

It is experimentally found that existing micro-holes or micro-concaves on the cemented carbide base surface of electroplated CBN wheel is one of important reasons to worsen the combining intensity of the electroplated abrasives layer with the grinding wheel base. It is well solved by sealing the holes or concaves with steam sealing method. Further more the electroplated CBN wheel with cemented carbide base for precision grinding of compressor cylinder vane slot is developed by optimizing the electroplating prescription and process. Productive grinding results show that the ground surface roughness, size precision and the wheel life have reached the advanced index of the same type of wheel imported.

Research on the 3-Axis CNC Ultra-Precision Grinding of Aspheric Mould

2009 ◽  
Vol 69-70 ◽  
pp. 39-43 ◽  
Author(s):  
Li Jun Li ◽  
Fei Hu Zhang ◽  
Shen Dong
Keyword(s):  
Influence Factors ◽  
Grinding Wheel ◽  
Aspheric Surface ◽  
Precision Grinding ◽  
Form Accuracy ◽  
Form Errors ◽  
Machining Test ◽  
Ultra Precision ◽  
Grinding System ◽  
Parallel Grinding

Parallel grinding is an effective method of aspheric moulds machining which is usually made of industrial ceramic such as silicon carbide (SiC) or tungsten carbide (WC), but if the spherical grinding wheel is not being with precision truing and dressing, the roughness and form accuracy of the ground aspheric surface should get worse, for this reason, in this paper, the influence factors of thoroughness and form accuracy induced by the wheel truing and dressing are studied firstly, and a new 3-axis CNC Ultra-precision grinding system which is based on the PMAC (Programmable Multi-axes Controller) is developed, through simultaneous motion of the controlled X, Z and B axis, the form errors which is induced by the grinding wheel can be improved theoretically, and the aspheric mould machining test shown that the surface roughness of Ra 0.025μm and the form accuracy of P-V 1.15μm are achieved.

A Study on the Grinding to Improve Profile Accuracy of Aspheric Lens

2007 ◽  
Vol 364-366 ◽  
pp. 1168-1173
Author(s):  
Seung Yub Baek ◽  
Eun Sang Lee ◽  
Jong Koo Won
Keyword(s):  
Surface Roughness ◽  
Tool Path ◽  
Production Costs ◽  
Total Production ◽  
Precision Grinding ◽  
Aspheric Lens ◽  
Ultra Precision ◽  
Grinding Technique ◽  
Profile Accuracy ◽  
Grinding System

This study presents the development of an ultra-precision grinding system based on a new grinding technique called the “In-Process Grinding Method (IPGM)”. IPGM which is used for grinding aspheric lens increases both the production and grinding performance, and significantly decreases total production costs. To enhance the precision grinding productivity of ultra-precision aspheric lens, we present here an ultra-precision grinding system and process for the aspheric micro-lens. The tool path was calculated and CNC program generation and tool path compensation were performed for aspheric lens. Using this ultra-precision grinding system, aspheric lens, 4mm in diameter, were successfully performed. The profile error after the first grinding without any compensation was less than 0.6μm, and surface roughness Ra was 0.01μm. In-process grinding was performed with compensation. Results of the profile accuracy P-V 0.3μm and surface roughness Ra 0.006 μm were obtained.

Development of an ultra-precision grinding system for machining optical aspheric components with a large depth—diameter ratio

2002 ◽  
Vol 216 (11) ◽  
pp. 1471-1479 ◽  
Author(s):  
M Chen ◽  
Q Zhao ◽  
S Dong ◽  
D Li
Keyword(s):  
Surface Roughness ◽  
Diamond Wheel ◽  
Linear Displacement ◽  
Diameter Ratio ◽  
Large Depth ◽  
High Profile ◽  
Machining Errors ◽  
Ultra Precision ◽  
Profile Accuracy ◽  
Grinding System

When grinding a large depth—diameter ratio aspheric part of high precision and high quality, the factors influencing surface roughness and profile accuracy of machined surfaces were theoretically analysed first. Afterwards the authors designed and manufactured the ultra-precision aspheric grinding system. The workpiece spindle, transverse guideway, longitudinal guideway and the grinder spindle are in aerostatic form. Turning accuracy of the workpiece spindle is 0.05 μm, the maximum rotational speed of the grinder is 80 000 r/min and the turning accuracy is 0.1 μm, and the resolution of linear displacement of the transverse and longitudinal guideway is 4.9 nm. The accuracy of the precise adjusting mechanism is 0.1 μm. The discharge principle of the dressing mechanism was developed in order to dress the diamond wheel. The ball-headed wheel has high profile accuracy after dressing. This mechanism solved the problem of on-position dressing of the case iron bonded diamond wheels and reduced the machining errors for aspheric surface components. Finally, grinding experiments for machining aspheric components were carried out. The grinding results indicated that the achieved profile accuracy is 0.3 μm and the surface roughness is less than 0.01 μm.

A Study on the Manufacturing System of the Axes Linked Ultra-Precision Grinding of Aspheric Surface

2011 ◽  
Vol 487 ◽  
pp. 500-504
Author(s):  
Li Jun Li ◽  
Y. Jiang ◽  
Fei Hu Zhang
Keyword(s):  
High Speed ◽  
Manufacturing System ◽  
High Strength ◽  
Maximum Speed ◽  
Aspheric Surface ◽  
Precision Grinding ◽  
High Speed Grinding ◽  
Ultra Precision ◽  
Grinding System ◽  
Parallel Grinding

The manufacturing system developed in this paper is mainly used for the ultra-precision grinding of the hard-cutting materials, such as high strength steel and carbonized tungsten, which are characteristics with axisymmetric aspheric surface. Under the priority of accuracy and grinding rigidity to design the key components of multi-axis linked parallel grinding system of aspheric surface, such as high speed grinding spindle, B axis grinding rotary table, clamps and center high adjusting system. Maximum speed of the grinding spindle is 90,000rpm, spindle rotating accuracy is 0.1μm, rotation-angle-accuracy of B axis is , center height adjusting accuracy is 0.1μm, using the system can realize parallel grinding of aspheric surface[1].

Thermal Analysis of Laser Irradiation of Fused Silica

2011 ◽  
Vol 314-316 ◽  
pp. 1960-1964 ◽  
Author(s):  
Peng Yao ◽  
Ya Dong Gong ◽  
Suo Xian Yuan ◽  
Tian Feng Zhou ◽  
Ji Wang Yan ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Surface Roughness ◽  
Laser Irradiation ◽  
Fused Silica ◽  
Maximum Temperature ◽  
Precision Grinding ◽  
Micro Cracks ◽  
Ductile Mode ◽  
Ultra Precision ◽  
Simulation Results

To grind fused silica in ductile mode, surface and subsurface micro cracks (SSMC) on ground fused silica should be repaired by CO2 laser irradiation before ultra-precision grinding. In this paper, 2D thermal analysis of single pass laser irradiation of fused silica was conducted, and the simulation results were discussed by comparing with the experiment results. To repair SSMC and decrease the surface roughness of ground fused silica simultaneously, the maximum temperature on the surface during laser irradiation should be controlled higher than 3280 K and lower than 3550 K.

Polishing Characteristics of ELID-Ground Surface of Nano Precision Optical Elements

2005 ◽  
Vol 291-292 ◽  
pp. 365-370 ◽  
Author(s):  
Wei Min Lin ◽  
Hitoshi Ohmori ◽  
T. Suzuki ◽  
Yoshihiro Uehara ◽  
Shinya MORITA
Keyword(s):  
Ground Surface ◽  
Diamond Wheel ◽  
Fused Silica ◽  
Optical Elements ◽  
Form Accuracy ◽  
High Form ◽  
Ultra Precision ◽  
Fundamental Research ◽  
Aspherical Mirrors ◽  
Polishing Tool

This paper describes an ultra precision polishing method of aspherical mirrors, and the fundamental research on polishing characteristics. The aspherical mirrors with a diameter of about 30mm made by fused silica glass and CVD-SiC were ELID (electrolytic in-process dressing)-ground to high form accuracy with #4000 cast iron bonded diamond wheel, and then polished with a small polishing tool. As the result, final surface roughness of 1.4nmRa and form accuracy of 1.2 μm was obtained.

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