Fast registration of 3D point clouds with offset surfaces in precision grinding of free-form surfaces

Chen, Shanyong; Wu, Chuanchao; Xue, Shuai; Li, Zheng Jian

doi:10.1007/s00170-018-2203-7

Cited by 9 publications

(6 citation statements)

References 23 publications

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“…Indicated points are the center points of a measuring stylus tip. There are many works by various authors, e.g., [39,40], dealing with the problem of the probe radius correction process. The system supporting the user in the selection of the number of measurement points examines the accuracy of two selected methods of the probe radius correction.…”

Section: New Methods Of the Distribution Of Measurement Points On Amentioning

confidence: 99%

A New Method of Distribution of Measurement Points on Curvilinear Surfaces of Products

Magdziak

2019

Sensors

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The article presents the method of selecting scanning lines along which coordinate measurements, performed by using, e.g., a coordinate measuring machine working in the single point probing mode, of free-form surfaces of measured workpieces may be conducted. Additionally, the proposed method supports the user of a coordinate measuring system during defining the number of measurement points distributed along selected scanning lines, thus deciding on the final distribution of measurement points on a measured surface of a product. The proposed method enables distributing measurement points in the parts of a measured product characterized by the worst quality of manufacturing. Moreover, the new method is very automated, therefore it affects the increase in the efficiency of coordinate measurements. The effect of using the new method is the non-uniform distribution of measurement points located on free-form surfaces. The presented algorithm takes into account the lengths of selected cross-sections of a measured curvilinear surface of an object, its geometrical complexity and the accuracy of the probe radius correction process. The decision regarding the number of measurement points is made on the basis of the accuracy analysis of the calculations of the corrected measurement points obtained during the probe radius correction process and the accuracy of the substitute model representing a measured curvilinear surface. Two methods of the correction process were used. The accuracy of the applied methods of the probe radius compensation process was estimated on the basis of the deviations calculated between corrected measurement points and scanning lines. The selection of scanning lines and the number of measurement points was realized by using the expert system based on the fuzzy logic. The paper presents the results of both simulation and experimental investigations. The numerical calculations were performed for two selected free-form surfaces. The verification of the developed algorithm was carried out during experimental investigations based on a measurement of a selected free-form surface. The conducted research was aimed at verifying the correctness of the distribution of measurement points generated using the proposed method. In the case of real measurements, measurement points should be located in the places of surfaces of products characterized by the largest deviations of manufacturing. The results of the conducted investigations confirm the usefulness of the developed algorithm for defining the distribution of measurement points on curvilinear surfaces in the coordinate measuring technique. Moreover, the way of implementation of the developed method of the distribution of measurement points in selected commercial measurement software is presented, thus enabling the use of the new method in the industry.

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Section: New Methods Of the Distribution Of Measurement Points On Amentioning

confidence: 99%

A New Method of Distribution of Measurement Points on Curvilinear Surfaces of Products

Magdziak

2019

Sensors

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“…It is based on the point-to-triangle distance, which involves only Delaunay triangulation of a two-dimensional dataset. Probe radius compensation is realized by registering the probe center points with the offset surface [21].…”

Section: Least-squares Model Of Global Stitching Optimizationmentioning

confidence: 99%

“…The normal deviation of the measurement point is used to evaluate the surface error. Registering the probe center points with the offset surface realizes probe radius compensation [21]. When the nominal motion is used without error compensation, the wrong surface error is obtained, as shown in figure 17.…”

Section: Coordinate Stitching Measurement Of Steep Freeform Surfacementioning

confidence: 99%

Coordinate stitching measurement of highly steep freeform surfaces

Chen

Zhai

2020

Meas. Sci. Technol.

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A coordinate measuring machine (CMM) is widely used for surface measurement during milling and grinding of workpieces. However, the measurement uncertainty increases with the surface slope for highly steep freeform surfaces. In addition, local features sometimes exist on the surface out of the accessible space of the CMM. This study presents a coordinate measurement method based on stitching multiple subpatches. The complex freeform surface of a large slope is first divided into subpatches which are individually tilted and measured with smaller uncertainty due to reduced slopes. A global stitching algorithm is then proposed to compensate the motion error and stitch all the subpatches together simultaneously, based on configuration optimization to minimize the overlap inconsistency. The coordinate stitching measurement method is first validated through simulation, which shows that the motion error of the order of 0.05°/0.5 mm is tolerable for a highly steep surface. It is then experimentally verified using the stitching measurement of an optical spherical surface and a steep freeform surface. An ordinary multi-axis adjustment stage is suitable for subpatch repositioning because the stitching algorithm compensates the motion error to a level lower than the CMM uncertainty.

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“…In the coordinate measuring technique, the probe radius correction process has a significant impact on the coordinate measurement results [ 33 ]. There are many works, e.g., [ 34 , 35 ], dealing with the problem of the probe radius correction process.…”

Section: Introductionmentioning

confidence: 99%

Estimating Time of Coordinate Measurements Based on the Adopted Measurement Strategy

Magdziak

2022

Sensors

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This article concerns coordinate metrology and contact coordinate measurements which are conducted using a coordinate measuring machine. The paper presents the results of experimental investigations, based on which a model to calculate the time needed to conduct coordinate measurements to determine the flatness deviation of a selected surface of a machined product was developed. The time taken and the accuracy of the coordinate measurements influence the effectiveness of coordinate measurements of geometrical quantities of products and the productivity of the entire manufacturing process. Therefore, when planning a strategy for the coordinate measurement process, apart from considering the measurement uncertainty, the duration of individual measurement tasks should also be taken into account. A coordinate measurement time model was developed by use of response surface methodology (RSM). Experimental research was carried out using an ACCURA II coordinate measuring machine equipped with a VAST XXT measuring probe and cooperating with Calypso inspection software. The coordinate measurement time model which was developed was implemented in the selected metrology software of the coordinate measuring machine. The purpose of the implementation was to enable application of the mathematical model created into industrial practice.

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Fast registration of 3D point clouds with offset surfaces in precision grinding of free-form surfaces

Cited by 9 publications

References 23 publications

A New Method of Distribution of Measurement Points on Curvilinear Surfaces of Products

A New Method of Distribution of Measurement Points on Curvilinear Surfaces of Products

Coordinate stitching measurement of highly steep freeform surfaces

Estimating Time of Coordinate Measurements Based on the Adopted Measurement Strategy

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