Measurement of the ballscrew contact angle by using the photoelastic effect and image processing

Chen, Terry Yuan-Fang; Hou, P. H.; Chiu, J. Y.

doi:10.1016/s0143-8166(01)00159-2

Cited by 11 publications

(7 citation statements)

References 1 publication

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“…Yao et al [15] used optical fiber to scan along the normal section in the ball-nut, on the basis that the optical fiber feed and the nut rotation should be synchronized. Chen et al [16] developed a novel measuring method for the contact angle of a ballscrew raceway, by means of the photoelastic effect, together with digital image-processing techniques. Chen et al [17] combined a traditional profile projector and a digital camera to construct a specific measurement system, in which the standard deviation of measuring results was about 0.05 • for a single raceway.…”

Section: Introductionmentioning

confidence: 99%

Optimization measurement for the ballscrew raceway profile based on optical measuring system

Wang

Feng

Zhou

et al. 2020

Meas. Sci. Technol.

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Given that the ballscrew raceway profile directly affects the service characteristics and precision retention of ball screws, this paper proposes an optimized continuous measuring method for the ballscrew raceway profile, without the need to adjust the sensor for the measurement of each raceway. Based on a comparison with existing measuring methods and principles, an optical measuring system is constructed, in which installation errors in the LED sensor and the linear calibration system, together with the straightness of the mobile platform, are obtained and analyzed. More importantly, in this work, we propose a transformation algorithm for the helix angle as well as an arc-selecting principle. Compared to the measurment results and time consumption of the profilometer, the maximum error for the measured radius and contact angle of the system proposed in this paper is 1.5 μm and 35′, and the measuring efficiency is increased by 15.8%, 58.6%, and 67.5% for 1, 5, and 20 continuous raceways, respectively, indicating effective performance in terms of accuracy, repeatability, and efficiency. Moreover, the system is also capable of measuring the pitch diameter and lead error of the ballscrew, which is significant in regard to classifying the accuracy of the ballscrew raceway profile, and improving machining precision.

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Section: Introductionmentioning

confidence: 99%

Optimization measurement for the ballscrew raceway profile based on optical measuring system

Wang

Feng

Zhou

et al. 2020

Meas. Sci. Technol.

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“…However, the method of data pre-processing requires manual removal of unavailable data. Chen et al (2002) developed a measurement method for the contact angle of ball screws by using the photo elastic effect and digital image processing techniques. Experimental results showed that this method was more accurate.…”

Section: Introductionmentioning

confidence: 99%

A novel non-contact measuring system for the thread profile of a ball screw

2018

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Abstract. In order to meet the demand of high position accuracy, many methods have been developed for measuring the thread profile features of ball screws. However, most of these efforts are limited to measuring a small number of ball screw features and therefore less efficient. In this study, an automatic, non-contact measuring system for the thread profile of a ball screw was developed. It is capable of measuring most common features of the ball screw thread profile and can measure ball screws of different sizes and lengths. The main part of the system is the light curtain which has a high-resolution line-scan CCD camera to measure the projected outer contour of the target. Data points from the thread profile of a ball screw were collected by the measuring system and data pre-processing was performed. Then, the proposed method was used to calculate the most important geometric parameters and errors of the thread profile. The accuracy of the measuring system was verified by testing and evaluating four sets of ball screws from different manufacturers.

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“…With the development of full-field optical metrology, the photoelastic method [9,10] and pseudo-caustics method [11,12] have become the two major optical methods applied in contact problems. Both methods are based on the stress-optical law exhibited in a small number of transparent materials.…”

Section: Introductionmentioning

confidence: 99%

Multiscale segmentation-aided digital image correlation for strain concentration characterization of a turbine blade fir-tree root

Sun

Zhou

Yang

et al. 2018

Meas. Sci. Technol.

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In this paper, a multiscale segmentation-aided digital image correlation method is proposed to characterize the strain concentration of a turbine blade fir-tree root during its contact with the disk groove. A multiscale approach is implemented to increase the local spatial resolution, as the strain concentration area undergoes highly non-uniform deformation and its size is much smaller than the contact elements. In this approach, a far-field view and several near-field views are selected, aiming to get the full-field deformation and local deformation simultaneously. To avoid the interference of different cameras, only the optical axis of the far-field camera is selected to be perpendicular to the specimen surface while the others are inclined. A homography transformation is optimized by matching the feature points, to rectify the artificial deformation caused by the inclination of the optical axis. The resultant genuine near-field strain is thus obtained after the transformation. A real-world experiment is carried out and the strain concentration is characterized. The strain concentration factor is defined accordingly to provide a quantitative analysis.

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Measurement of the ballscrew contact angle by using the photoelastic effect and image processing

Cited by 11 publications

References 1 publication

Optimization measurement for the ballscrew raceway profile based on optical measuring system

Optimization measurement for the ballscrew raceway profile based on optical measuring system

A novel non-contact measuring system for the thread profile of a ball screw

Multiscale segmentation-aided digital image correlation for strain concentration characterization of a turbine blade fir-tree root

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