Fabrication of Micro Aspheric Mould Integrated Ultra-Precision Grinding and Magnetorheological Finishing

2010 ◽  
Vol 135 ◽  
pp. 134-138 ◽  
Author(s):  
Shao Hui Yin ◽  
Heng Ning Tang ◽  
Jian Wu Yu ◽  
Kun Tang ◽  
Feng Jun Chen ◽  
...  
Keyword(s):  
Surface Quality ◽  
Magnetorheological Finishing ◽  
Precision Grinding ◽  
Form Accuracy ◽  
Ultra Precision ◽  
Glass Lens ◽  
Parallel Grinding

This paper deals with one-point parallel grinding and magnetorheological finishing (MRF) polishing of micro glass lens mould. Firstly,the analysis and experiment of one-point parallel grinding are conducted on micro-aspheric mould with 10mm in diameter , after grinding ,the results show that the form accuracy of the micro aspheric mould are 2.538 μm in PVand 0.645 μm in RMS, also the subsurface damages and residual grinding marks are left ;And then , the magnetorheological finishing experiment is counducted, the form accuracy achieves 0.892 μm in PV and 0.287 μm in RMS ,after finishing, the surface quality was improved.

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.

Basic Study on High Efficiency Ultra-Precision Grinding of the Optical Glass Lens

2014 ◽  
Vol 1017 ◽  
pp. 21-26 ◽  
Author(s):  
Rei Sekiguchi ◽  
Shun Yoshikawa ◽  
Yasuhiro Kakinuma ◽  
Katsutoshi Tanaka ◽  
Masahiko Fukuta
Keyword(s):  
Surface Quality ◽  
High Efficiency ◽  
Optical Glass ◽  
High Surface ◽  
Precision Grinding ◽  
Form Accuracy ◽  
Large Aperture ◽  
Highly Efficient ◽  
Ultra Precision ◽  
Glass Lenses

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 polishing and ultimately results in lower form accuracy. Thus in this study, aiming at the realization of highly efficient and precise grinding of glass lenses, cross grinding of optical glass BK7 is carried out. As a first step of the study, the influence of grinding conditions on the surface quality is investigated experimentally.

Optical Properties of Aspheric Glass Lens Using DLC Coating Mold

2007 ◽  
Vol 345-346 ◽  
pp. 1577-1580 ◽  
Author(s):  
Hyun Uk Kim ◽  
Sang Hwa Jeong ◽  
Hye Jeong Kim ◽  
Jeong Ho Kim
Keyword(s):  
Precision Grinding ◽  
Camera Phone ◽  
Form Accuracy ◽  
Ion Plating ◽  
Dlc Coating ◽  
Aspheric Glass Lens ◽  
Before And After ◽  
Ultra Precision ◽  
Glass Lens ◽  
Coating Mold

In this research, the optimal grinding condition has been obtained by design of experiment(DOE) for the development of aspheric lens for the 3 Mega Pixel, 2.5x optical zoom camera-phone module. Also, the WC mold was processed by the method of ultra precision grinding under this optimal grinding condition. The influence of DLC coating on form accuracy (PV) and surface roughness(Ra) of the mold was evaluated through measurements after DCL coating using ion plating on the ground mold. Also, aspheric glass lens was molded by before and after the use of the mold of DLC coating, respectively. The optical characteristics of each sample, which were molded by the different mold, were compared with each other.

Ultra-Precision Machining Technology of the Soft and Brittle Functional Crystal

2008 ◽  
Author(s):  
C. P. Lu ◽  
H. Gao ◽  
R. K. Kang ◽  
X. J. Teng ◽  
Q. G. Wang
Keyword(s):  
Surface Quality ◽  
Modern Technology ◽  
Diamond Turning ◽  
Precision Machining ◽  
Machining Efficiency ◽  
Magnetorheological Finishing ◽  
Precision Grinding ◽  
Ultra Precision ◽  
Definition Of ◽  
Important Branch

As an important branch of materials, soft and brittle functional crystals (SBFC) are widely used in the field of modern technology. However, the softness, brittleness, deliquescence, and strongly anisotropic natures of these materials present a challenge for their ultra-precision machining. The definition of SBFC is firstly given and their applications in many fields are also presented. For the ultra-precision machining technologies to satisfy the applied requirements, many methods such as single diamond turning, ultra-precision grinding, magnetorheological Finishing and so on, are successfully applied in SBFC materials, the challenges and difficulties occurred during machining these SBFC materials, such as KH2PO4, CdZnTe and CaF2, etc., are reviewed and the limits are also analyzed in detail. Moreover, many novel machining methods are suggested to achieve better surface quality and enhance machining efficiency.

Precision Grinding of Structured Tungsten Carbide Mold

2012 ◽  
Vol 497 ◽  
pp. 15-19 ◽  
Author(s):  
Hirofumi Suzuki ◽  
Tatsuya Furuki ◽  
Mutsumi Okada ◽  
Yutaka Yamagata ◽  
Shinya MORITA
Keyword(s):  
Tungsten Carbide ◽  
Power Efficiency ◽  
Fresnel Lens ◽  
Rare Metal ◽  
Diamond Wheel ◽  
Precision Grinding ◽  
Form Accuracy ◽  
Molding Method ◽  
Grinding Method ◽  
Glass Lens

Demands of glass Fresnel lens is increasing in solar panel in order to increase power efficiency. Glass lens is usually molded by glass molding method with tungsten carbide molds. In this study, large Fresnel lens molds made of tungsten carbide are tested to be ground by simultaneous 2-axis (Y, Z) controlled grinding method. The resinoid bonded diamond wheel was trued with a rare metal truer to improve the sharpness of the wheel edge. In the grinding test of the tungsten carbide mold, a form accuracy of less than 0.8 μm P-V and surface roughness of 18 nm Rz were obtained, and it is clarified that the proposed grinding method is useful for the Fresnel grinding.

The Research of ELID Grinding Effect and Surface Quality on Carbonized Cold-Rolled Steel

2012 ◽  
Vol 229-231 ◽  
pp. 542-546
Author(s):  
J.L. Guan ◽  
Li Li Zhu ◽  
H.W. Lu ◽  
Zhi Wei Wang
Keyword(s):  
Surface Roughness ◽  
Surface Quality ◽  
Grinding Wheel ◽  
Rolled Steel ◽  
Precision Grinding ◽  
Cold Rolled Steel ◽  
Elid Grinding ◽  
Peripheral Velocity ◽  
Ultra Precision ◽  
Cold Rolled

In this document, the electrolytic in-process dressing ( ELID ) grinding technique is used for ultra-precision processing experimental research on the carbonized cold-rolled steel (HRC60～80).A surface roughness of Ra6～8nm was obtained after ELID precision grinding. The results proved that adopting micro grain size (W1.5～W36) and high hardness cast iron based diamond grinding wheel, increasing the wheel peripheral velocity (18～20m/s) and reducing grinding depth can effectively improve surface quality and bring the surface roughness down. The wheel peripheral velocity, grinding depth as well as grinding fluid are the main factors during ultra-precision grinding.

Stick-Slip Simulation of Feeding System in Silicon Ultra-Precision Grinding Machine

2012 ◽  
Vol 566 ◽  
pp. 530-533
Author(s):  
Zhi Hua Sha ◽  
Shao Xing Zhang ◽  
Yi Wang ◽  
Sheng Fang Zhang
Keyword(s):  
Surface Quality ◽  
Silicon Wafer ◽  
Crystalline Silicon ◽  
Virtual Prototype ◽  
Feeding System ◽  
Precision Grinding ◽  
Stick Slip ◽  
Machining Precision ◽  
Ultra Precision ◽  
Grinding Machine

Mono-crystalline silicon is the typical substrate material in integrated circuits manufacturing, and machining precision and surface quality of the silicon wafer impacts on the quality and performance of the electronic products directly. Silicon grinding technology has high accuracy, low cost and can obtained high surface quality, which has become the mainstream of silicon ultra-precision machining. Stick-slip of feeding system in silicon ultra-precision grinding machine is an important factor which influencing the machining precision of the silicon wafer. In this paper, based on the structure analysis of feeding system in a certain type of silicon ultra-precision grinding machine, the rigid body coupling virtual prototype model of the feeding system is established using ADAMS, the factors which influencing the stick-slip is analyzed deeply via the dynamic simulation of the virtual prototype.

Research on Precision Mirror Machining Technology for W-Mo Alloy

2011 ◽  
Vol 487 ◽  
pp. 303-307
Author(s):  
Jia Liang Guan ◽  
H.W. Lu ◽  
X.H. Xiao ◽  
Y.C. Wu ◽  
Z.D. Chen
Keyword(s):  
Surface Quality ◽  
Formation Mechanism ◽  
Rotational Speed ◽  
Precision Machining ◽  
Work Piece ◽  
Mirror Surface ◽  
Precision Grinding ◽  
Elid Grinding ◽  
Ultra Precision

A new way of precision machining was studied through the experiments of Electrolytic In-Process Dressing (ELID) precision grinding and ultra precision lapping and polishing for W-Mo metal alloy. First a 22nm(Ra) surface was obtained through the ELID grinding, last a 11nm(Ra) surface was obtained after the process of lapping and polishing with 0.1～0.3 N/cm2pressure, 60～100 r/min rotational speed and other optimized parameters. Meanwhile, the formation mechanism of ultra precision mirror surface of the alloy was also analyzed. The experiments prove surface quality of the work piece was guaranteed by ELID grinding, and which was also greatly affected by some parameters in lapping and polishing such as pressure, rotational speed.

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