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grinding process aspheric

A study on optimum grinding factors for aspheric convex ...

01/03/2007  Aspheric lens can be manufactured by various methods: deterministic micro-grinding and magneto-rheological finishing, electrolytic in-process dressing grinding, mechanical micro-machining and plastic molding. But ultra-precision grinding still remains a major research topic because of the need to develop a grinding system that can provide stable, high accuracy of aspheric parts on the

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Efficient grinding and polishing processes for asphere ...

30/09/2020  In the process of large aspheric optical surfaces fabrication, the distortion of the removal function is a big problem that affects the producing efficiency and accuracy, due to the misfit between ...

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Three-Linear-Axis Grinding of Small Aperture Aspheric

In other aspheric grinding methods, the grinding . point trajectory is usually a meridian of the aspheric surface. Howev er, determining the wheel path for a space curve is . more difficult in X ...

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Fabrication of small aspheric moulds using single point ...

01/01/2015  Han et al. specially designed an evolutionary grinding process for the fabrication of aspheric surfaces of a glass ceramic substrate . Kim ... Cylindrical grinding wheels of 2 mm and 6 mm in diameter were selected for grinding the aspheric surfaces with apertures of 2 mm and 6 mm, respectively. Diamond wheels of with cast iron bond of #325 and resin bond of #2000 were employed

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Arc Envelope Grinding of Sapphire Steep Aspheric Surface ...

15/05/2020  In order to improve the grinding wheel wear during the sapphire steep aspheric surface grinding process, a SiC-reinforced resin-bonded hemispherical diamond wheel was used and the arc envelope grinding performance was investigated. Firstly, the mapping relationship between the contours of the grinding wheel and the aspheric surface was established based on the grinding conditions.

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Novel automated process for aspheric surfaces —

We report on the development of a novel industrial process, embodied in a new robotic polishing machine, for automatically grinding and polishing aspheric optics. The machine is targeted at meeting the growing demand for inexpensive axially symmetric but aspherical lenses and mirrors for industry and science, non-axisymmetric and conformal optics of many kinds, the planarization of silicon ...

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Profile error compensation in precision grinding of ...

In the process of aspheric grinding, there are many errors that affect the profile accuracy, such as workpiece and wheel setting error, tool path error, machine positioning error, wheel wear error, wheel size and section profile errors. Among them, the effect of the tool path and machine positioning errors can be partly masked out when machining with an ultra-precision machine tool. The wheel ...

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Aspheric lens at the highest level

Various grinding tools and technologies are used for this complex process. The ability to simulate the individual process steps using asphericon's unique CNC control software allows for an unprecedented realization, for high flexibility and reliability during the entire process. In the following, the polishing process is an important part in the production of an aspheric lens. Step by step ...

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Dressing Process - an overview ScienceDirect Topics

09/12/2012  ELID aspheric grinding has been investigated for optical lenses and molds. ELID technique has even been extended to face grinding and double-side grinding. Finally, ELID lab grinding is similar to ELID double-side grinding except that it uses one wheel and a spindle. This operation is the main focus of this project and will be explained extensively later [51]. View chapter

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Grinding Model of Processing Aspheric Parts by

A new method of processing optical aspheric parts by of bending and forming is presented, and the processing is line contact. The grinding principle is given of the bending and forming method. Based on the Preston equation, the grinding conditions is put forward to the bending and forming method. The function of the pressure and the relative velocity on the any point of at the processing ...

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A Study of Micro-Grinding and Inspection for Aspheric ...

A window interface was designed by using Borland C++ Builder for optical glass design. The aspheric design parameters were substituted in it to obtain the machining path. In terms of Taguchi method optimization, the performance of electroformed grinding rod was compared with that of resin grinding rod. Taguchi method was used to look for ...

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Asphere Manufacturing - CNC Asphere Grinding Sub ...

For generating the aspheric surface, Vertex counts on the OptiPro eSX 150 CNC optical grinding machine. With 5-axes of computer-controlled motion and generous machine travels, Vertex is able to generate rough and fine grind surfaces for aspheres up to 150mm in diameter. For aspheres up to 300mm, Vertex has the capability of the OptiPro OptiSonic 550X ultrasonic machining center at our

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Novel automated process for aspheric surfaces —

We report on the development of a novel industrial process, embodied in a new robotic polishing machine, for automatically grinding and polishing aspheric optics. The machine is targeted at meeting the growing demand for inexpensive axially symmetric but aspherical lenses and mirrors for industry and science, non-axisymmetric and conformal optics of many kinds, the planarization of silicon ...

More

Kinematics of material removal process in aspheric surface ...

The kinematics of the grinding process, characterised by the study of topography of grinding wheel surface and mechanism of material removal, taking into account conformity between grinding wheel and glass mould have been described for aspheric surface generation on glass moulds. The grit depth of cut analysis explains the influence of the geometry of the conformity between wheel and glass ...

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OSA Off-spindle-axis spiral grinding of aspheric ...

The contour grinding, such as cross grinding and parallel grinding , is generally employed to fabricate the symmetric aspheric surfaces. However, it fails to manufacture the AMLA because the axis of work spindle cannot be aligned to each symmetric axis of the lens-let in a single workpiece installation. The OSA spiral grinding provides a new perspective that constructs a spiral wheel path for ...

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Process Mechanism in Shape Adaptive Grinding (SAG), for ...

Process Mechanism in Shape Adaptive Grinding (SAG), for Application to Aspheric X-Ray Mirror Molding Dies Yoshiharu Namba, Anthony Beaucamp Richard Freeman (Zeeko LTD) Shape Adaptive Grinding (SAG) is a novel process for freeform machining of difficult materials such as ceramics and hard metals. Despite low stiffness equipment from the machining equipment, due to the semi-elasticity

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Diamond Grinding of Optical Surfaces on Aspheric Lens ...

The process development discussed in this paper will in efficient manufacturing. concentrate on the information gathered through our previous grinding of optical (aspheric) the gathered through our previous grinding of optical (aspheric) concentrate surfaces on and silicon carbide workpieces. Determining a satisfactory satisfactory surfaces on tungsten carbide and silicon carbide workpieces ...

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Aspheric lens at the highest level

Various grinding tools and technologies are used for this complex process. The ability to simulate the individual process steps using asphericon's unique CNC control software allows for an unprecedented realization, for high flexibility and reliability during the entire process. In the following, the polishing process is an important part in the production of an aspheric lens. Step by step ...

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The study of sub-surface damage distributions during ...

The grinding process is the primary technology for curvature generation (CG) on glass optics. The higher material removal rate (MRR) leads to deeper sub-surface damage (SSD) on lens surface. The SSD must be removed by following lapping and polishing processes to ensure the lens quality. However, these are not an easy and an efficient process to remove the SSD from ground surface directly for ...

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Grinding Model of Processing Aspheric Parts by

A new method of processing optical aspheric parts by of bending and forming is presented, and the processing is line contact. The grinding principle is given of the bending and forming method. Based on the Preston equation, the grinding conditions is put forward to the bending and forming method. The function of the pressure and the relative velocity on the any point of at the processing ...

More

A Study of Micro-Grinding and Inspection for Aspheric ...

A window interface was designed by using Borland C++ Builder for optical glass design. The aspheric design parameters were substituted in it to obtain the machining path. In terms of Taguchi method optimization, the performance of electroformed grinding rod was compared with that of resin grinding rod. Taguchi method was used to look for ...

More

Asphere Manufacturing - CNC Asphere Grinding Sub ...

For generating the aspheric surface, Vertex counts on the OptiPro eSX 150 CNC optical grinding machine. With 5-axes of computer-controlled motion and generous machine travels, Vertex is able to generate rough and fine grind surfaces for aspheres up to 150mm in diameter. For aspheres up to 300mm, Vertex has the capability of the OptiPro OptiSonic 550X ultrasonic machining center at our

More

OSA Off-spindle-axis spiral grinding of aspheric ...

The contour grinding, such as cross grinding and parallel grinding , is generally employed to fabricate the symmetric aspheric surfaces. However, it fails to manufacture the AMLA because the axis of work spindle cannot be aligned to each symmetric axis of the lens-let in a single workpiece installation. The OSA spiral grinding provides a new perspective that constructs a spiral wheel path for ...

More

Process Mechanism in Shape Adaptive Grinding (SAG), for ...

Process Mechanism in Shape Adaptive Grinding (SAG), for Application to Aspheric X-Ray Mirror Molding Dies Yoshiharu Namba, Anthony Beaucamp Richard Freeman (Zeeko LTD) Shape Adaptive Grinding (SAG) is a novel process for freeform machining of difficult materials such as ceramics and hard metals. Despite low stiffness equipment from the machining equipment, due to the semi-elasticity

More

Metrology for the production process of aspheric lenses in ...

As an example, the process of the grinding and the polishing of high-precision lenses is demonstrated in principle in Figure 1. The goal of this production is to fabricate high-precision lenses. In order to obtain form deviations of a few hundred nanometers and below, the production machines have to be corrected all the time in a closed-loop process. In the first step, an aspheric contour is ...

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Grinding tool optimization in computer controlled

18/11/2014  GRINDING PROCESS OPTIMIZATION FOR ASPHERIC As the misfit model between the grinding tool and the local surface of aspheric has been established, and the detailed process of grinding tool for aspheric has also been experimentally investigated, we can set up the flow process chart of the grinding tool optimization, as shown in Fig.5. yzbNs bLocezz 1001 MG ens1nsfi foIsLsui

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Aspheric lens at the highest level

Various grinding tools and technologies are used for this complex process. The ability to simulate the individual process steps using asphericon's unique CNC control software allows for an unprecedented realization, for high flexibility and reliability during the entire process. In the following, the polishing process is an important part in the production of an aspheric lens. Step by step ...

More

Comparison of tactile measurement methods

Measurement of surface shape deviation using the example of grinding. The surface geometry of an asphere deviates from a sphere, but it is still rotationally symmetric. Through the rotation of the lens during machining (Fig.1), grinding tools leave rotationally symmetric structures on unfinished lenses. For the grinding process, it usually is ...

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The end of onion-ring bokeh? Panasonic beats the curse

02/05/2014  Previously, aspheric lenses could only be created by a very exacting, time-intensive grinding process, that was ill-suited to mass production. As you might expect, this made aspheric

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