Developments in precision optical grinding technology

Fess, Edward; Bechtold, Mike; Wolfs, F. L. H.; Bechtold, Rob

doi:10.1117/12.2029334

Cited by 7 publications

(3 citation statements)

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“…Therefore, it can reduce the subsequent polishing time. When using a cup wheel for generating grinding of a spherical surface [ 5 ], two different cup wheels are required for the inner and outer spheres, leading to tool-setting errors. If a head wheel is used, dressing or replacement of the grinding wheel will also cause tool-setting errors [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

On-Machine Measurement of Profile and Concentricity for Ultra-Precision Grinding of Hemispherical Shells

et al. 2022

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The profile and concentricity of hemispherical shells affect the frequency split and quality factor of hemispherical resonators. To compensate for machining errors caused by tool wear and tool setting, an on-machine measurement (OMM) method for the profile and concentricity of hemispherical shells in ultra-precision grinding was developed without the removal of workpieces from the machine tool. The OMM utilizes an inductive lever probe to test the inner and outer surfaces of the shell. A standard sphere is utilized to calibrate the relative position of the inductive lever probe at the two different work positions. To enhance the test accuracy of the OMM, a zero-position trigger-sampling method for the inductive lever probe was developed. It was verified to achieve a stable repeatability accuracy of 0.04 μm when using the OMM to realize a single-point sampling. Hemispherical shells were tested using the proposed OMM method. The concentricity test’s accuracy was verified to achieve accuracy better than 1 μm using a coordinate measuring machine and a standard sphere. The accuracy was 0.26 μm for testing the profiles of the hemispherical shell. The proposed OMM system was integrated with an ultra-precision machine tool. It is hoped that this method can help realize the integration function of machining-measurement-compensation.

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Section: Introductionmentioning

confidence: 99%

On-Machine Measurement of Profile and Concentricity for Ultra-Precision Grinding of Hemispherical Shells

et al. 2022

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“…Its relatively small size, complex structure, and it being significantly hard and brittle make it difficult to manufacture. Generating grinding with a cup wheel is a common high-efficiency, highprecision, spherical forming method [5,6], by which the one-time formation of the HSR single spherical surface, support rod, and chamfer can be completed with a single-direction feeding and tool posture [7]. Studies regarding the application of this method to HSR machining are limited.…”

Section: Introductionmentioning

confidence: 99%

Geometric Error Analysis and Compensation in Spherical Generating Grinding of Hemispherical Shell Resonators

et al. 2022

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The geometric accuracy of a hemispherical shell resonator (HSR) affects the assembly accuracy and final performance of a hemispherical resonant gyroscope in many ways. During the precision grinding of a resonator, the tool-setting error and wear error affect the form and positional accuracy of the inner and outer spherical surfaces. In this study, a compensation method for generating grinding of the HSR is proposed to address this problem. The geometric errors of the inner and outer spherical surfaces are systemically analyzed and a geometric model of the tool setting and wheel wear is established for generating grinding of the HSR. According to this model, a mapping relationship between the wheel pose and size, form, and positional error of the HSR was proposed. Experiments regarding machining, on-machine measurements, and error compensation were performed using the mapping relationship. The results demonstrate that the proposed method can reduce the radius error of the inner and outer spherical surfaces from 10 μm to 1 μm, sphericity from 5 μm to 1.5 μm, and concentricity from 15 μm to 3 μm following grinding. The form and positional errors are simultaneously improved, verifying the effectiveness of the proposed method.

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“…The method of line contact spherical grinding by cup-shaped wheel with torus end, because of its high efficiency and simple processing, is widely used in the processing of sphere generation especially lens manufacturing. Grinding equipment produced by OptiPro, Satisloh AG, and so on are equipped with the grinding method and grinding wheel [9,10]. But this kind of literature for error analysis and compensation are rarely seen.…”

Section: Introductionmentioning

confidence: 99%

Error analysis and compensation of line contact spherical grinding with cup-shaped wheel

Peng

Dai

Song

et al. 2015

Int J Adv Manuf Technol

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According to forming principle of line contact spherical generating by cup-shaped wheel, the sources of grinding error were analyzed, and a new method for error analysis and compensation was proposed in this paper. In a certain grinding condition, the grinding error caused by the pose errors between wheel and workpiece was simulated, the corresponding curve fitting of grinding error was carried out, and an appropriate parametric model was established. If the actual grinding error is known, the model can identify the corresponding pose error as well as compensate the grinding error. The simulation and experiment processes of compensation validate the efficient and workability of parametric model, and improve the grinding precision.

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Developments in precision optical grinding technology

Cited by 7 publications

References 0 publications

On-Machine Measurement of Profile and Concentricity for Ultra-Precision Grinding of Hemispherical Shells

On-Machine Measurement of Profile and Concentricity for Ultra-Precision Grinding of Hemispherical Shells

Geometric Error Analysis and Compensation in Spherical Generating Grinding of Hemispherical Shell Resonators

Error analysis and compensation of line contact spherical grinding with cup-shaped wheel

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