Home >Products >

Products

Case

grinding process aspheric

2018-12-09T07:12:29+00:00

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

Mar 01, 2007  Therefore, it is most important to achieve the same local removal depth over all points on the aspheric surface in the polishing process, which improves the surface roughness. Although the aspheric surface micro-lens machining has been studied, ultra-precise grinding of aspheric or mold core has not been fully studied.

Cited by: 55

Arc Envelope Grinding of Sapphire Steep Aspheric Surface ...

May 15, 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

Author: Jinhu Wang, Qingliang Zhao, Chunyu Zhang, Bing Guo, Julong Yuan

Fabrication of small aspheric moulds using single point ...

Jan 01, 2015  Han et al. specially designed an evolutionary grinding process for the fabrication of aspheric surfaces of a glass ceramic substrate . Kim et al. developed a new sub-micron control algorithm in order to interpolate tool path in grinding and polishing aspheric surfaces .

Cited by: 26

Asphere Manufacturing - Asphere Grinding Sub ...

For generating the aspheric surface, Vertex counts on the OptiPro eSX 150 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.

Estimated Reading Time: 2 mins

(PDF) Shape Adaptive Grinding of Silicon Carbide Aspheric ...

Shape adaptive grinding (SAG) is a novel process for freeform machining of difficult materials such as ceramics and hard metals. Despite low stiffness requirement from the machining equipment, due ...

Estimated Reading Time: 5 mins

The effect of grinding processing parameters on aspheric ...

The processing parameters are determined to minimize the waviness amplitude. Considering the problem of uniformity of waviness, according to the influence of grinding force on uniformity of aspheric waviness in grinding process, down-grinding grating parallel grinding method and up-grinding grating parallel grinding method are used.

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

Mar 01, 2007  Therefore, it is most important to achieve the same local removal depth over all points on the aspheric surface in the polishing process, which improves the surface roughness. Although the aspheric surface micro-lens machining has been studied, ultra-precise grinding of aspheric or mold core has not been fully studied.

How to Efficiently Manufacture an Asphere

Step 2: Rough/fine grinding of aspheric surface. The second step involves using a ring tool, ball tool, or grinding wheel to contour the aspheric deviation into the best fit sphere. The optical grinder is programmed to have the rough tool contour the aspheric surface by starting at the edge of the optic and moving toward the center.

Efficient grinding and polishing processes for asphere ...

The common manufacturing methods of small-scale aspheric lenses can be divided into three types: direct grinding and polishing [2], molding technology [3], and injection forming technology [4 ...

An investigation into parallel and cross grinding of ...

Apr 03, 2015  Cross and parallel grinding modes are two typical general grinding modes for aspheric surface in vertical wheel spindle grinding system. In this paper, roughness, surface profile, form accuracy, and wheel wear of the ground aspheric surface utilizing the cross and parallel grinding methods are compared and investigated. Firstly, the maximum undeformed chip thickness of aspheric

How an Aspheric Lens is Made Edmund Optics

Edmund Optics® manufactures thousands of precision aspheric lenses per month in our asphere manufacturing cell that operates 24 hours a day. This video shows the entire manufacturing process of an asphere including curve generation, in-process metrology, computer numerical controlled () grinding, polishing, magnetorheological finishing (MRF), centering, coating, and final inspection.

Compound Machining of Tungsten Alloy Aspheric Mould by ...

Jul 01, 2021  The grinding wheel axis and the polishing axis are in the same plane to achieve conversion freely during machining, the form of aspheric surface is created through X, Z and B three-axis linkage, and the workpiece does not need to be repeatedly installed and located, so the compound machining process can improve the processing efficiency and ...

spherical grinding quality - Nex

Aug 31, 2020  Grinding marks on ultra precision grinding spherical and. Oct 07, 2017 Grinding marks are regard as a great obstacle to manufacture spherical and aspheric surfaces with higher surface quality, lower energy and wastage. The scallop-height was studied for optimizing the grinding parameters firstly to reduce its effect on grinding marks.

Development of an intelligent grinding system for ...

Oct 12, 2020  Aspheric lens grinding process verification. An aspheric synthetic silica lens of diameter and thickness 230 and 33.86 mm, respectively, were used to evaluate the performance of the grinding machine. Figure 14 depicts the aspherization and measurement process, and Fig. 15 illustrates the measurement result. A precise profiler (Form Talysurf ...

OSA Evolutionary grinding model for nanometric control ...

A new evolutionary grinding process model has been developed for nanometric control of material removal from an aspheric surface of Zerodur substrate. The model incorporates novel control features such as i) a growing database; ii) an evolving, multi-variable regression equation; and iii) an adaptive correction factor for target surface roughness (Ra) for the next machine run.

ultra fine wire grinding machine

The aspheric glass lens mold consists of three pieces upper punch lower punch and sleeve die part. ... One of the most important process of needle manufacturing is Point Grinding Process where thousands of straight-cut wires are conveyed by feed wheel and are continuously polished by grind stones to sharpen the tips of wires and make needles ...

A research on the mechanism and model of surface micro ...

Sep 02, 2021  Grinding hardening can obtain hardening effect besides fine machining effect on the surface of workpiece. A certain degree of surface micro-damage will be formed during grinding hardening process which mainly contains micro-crack, melting coating, decarburization, and

Micromachines Free Full-Text Fabrication of Multifocal ...

Microlenses can be widely used in integrated micro-optical systems. However, in some special applications, such as light field imaging systems, multifocal microlens arrays (MLA) are expected to improve imaging resolution. For the fabrication of multifocal MLA, the traditional fabrication method is no longer applicable. To solve this problem, a fabrication method of multifocal MLA by a one step ...

China 2021 High quality Brass Turning Parts Supplier - ...

Process accuracy: processing according to customer drawings, incoming materials, etc. Brand Name: Lingjun. Shaft refers to a shaft with high precision requirements such as roundness runout. Some shafts that require high precision, such as roundness runout, are also called shaft cores. Often non-standard parts, customized processing according to ...

The effect of grinding processing parameters on aspheric ...

The processing parameters are determined to minimize the waviness amplitude. Considering the problem of uniformity of waviness, according to the influence of grinding force on uniformity of aspheric waviness in grinding process, down-grinding grating parallel grinding method and up-grinding grating parallel grinding method are used.

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

Mar 01, 2007  Therefore, it is most important to achieve the same local removal depth over all points on the aspheric surface in the polishing process, which improves the surface roughness. Although the aspheric surface micro-lens machining has been studied, ultra-precise grinding of aspheric or mold core has not been fully studied.

Grinding Model of Processing Aspheric Parts by Bending ...

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 ...

Diamond Grinding of Aspheric Surfaces on a 4-Axis ...

Jan 01, 1985  Jan 01, 1985  The present trend in the manufacture of precision aspheric surfaces is the use of grinding, lapping, and polishing. Though large scale research is on the direct moulding of precision aspheric surfaces, mouldings are at present restricted to lighting, condenser lens and other non-precision optics. ... without the intermediate lapping process ...

Efficient grinding and polishing processes for asphere ...

The common manufacturing methods of small-scale aspheric lenses can be divided into three types: direct grinding and polishing [2], molding technology [3], and injection forming technology [4 ...

How to Efficiently Manufacture an Asphere

Step 2: Rough/fine grinding of aspheric surface. The second step involves using a ring tool, ball tool, or grinding wheel to contour the aspheric deviation into the best fit sphere. The optical grinder is programmed to have the rough tool contour the aspheric surface by starting at the edge of the optic and moving toward the center.

Tactile measurement of aspheric lenses

Aug 10, 2021  Aug 10, 2021  For the grinding process, it usually is sufficient in sense of the measuring technique to monitor the surface contour to optimize the next working step. The advantage of this simple measurement is, among other things, a short measuring time, which contributes to the optimization of the entire processing time.

How an Aspheric Lens is Made Edmund Optics

Edmund Optics® manufactures thousands of precision aspheric lenses per month in our asphere manufacturing cell that operates 24 hours a day. This video shows the entire manufacturing process of an asphere including curve generation, in-process metrology, computer numerical controlled () grinding, polishing, magnetorheological finishing (MRF), centering, coating, and final inspection.

An Introduction to the Optics Manufacturing Process

Oct 31, 2008  Oct 31, 2008  grinding process. As the polishing process continues, the pitch will slowly conform to the shape of the optic so that the surface of the optic is smoothed out, but its overall ... process, melted plastic is pressed into a mold (spherical or aspheric), then cooled and ejected from the mold. The injection molding process must be carefully controlled,

Metrology for the production process of aspheric lenses

Jun 01, 2016  Jun 01, 2016  In testing aspheric lenses, a linear scan is performed, and in the subsequent analysis process, the measured profile is fit to the nominal aspheric shape. The differential profile ( Figure 4 ) can then be used to correct the grinding or diamond-turning process.

Three-Linear-Axis Grinding of Small Aperture Aspheric ...

Apr 16, 2019  In this case, the contact point on the grinding wheel is kept invariant across the entire aspheric surface, which ensures that the wheel geometry imperfections do not transfer onto the part surface during the grinding process [22, 23]. Thus, this grinding process is a type of ultra-precision grinding with a single contact point between the ...

Arc Envelope Grinding of Sapphire Steep Aspheric Surface ...

May 15, 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.

Asphere Manufacturing - Asphere Grinding Sub ...

For generating the aspheric surface, Vertex counts on the OptiPro eSX 150 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.

Research on Ultra Precision Grinding Technologies of Large ...

trajectory, which scans the whole aspheric. In the grinding process, the direction of the linear velocity of wheel is parallel to the feed direction of element. The grinding points are circumferential on the wheel surface, which increases the useful width of wheel and manifolds the grinding edges.