A method for detecting alignment deviation on a thread-measuring instrument

Chen, Sheng; Zhao, Ding; Lü, Yonghua; Liu, Kai

doi:10.1088/0957-0233/24/8/085002

Cited by 4 publications

(3 citation statements)

References 14 publications

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“…Based on the LED sensor selected in section 2, an optical measurement system for the ballscrew raceway profile is constructed. Taking account of the fact that the performance of the measurement system is significantly influenced by the accuracy of the component assembly [19][20][21], systematic errors are then analyzed.…”

Section: Measuring System Based On the Led Sensormentioning

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: Measuring System Based On the Led Sensormentioning

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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show abstract

“…Chen, Omori, and Galestien adopted a stylus scanning method to measure parameters in the axial section. The main parameters of screw threads are extracted in a single operation [14][15][16][17]. The laser triangulation method has been applied for thread parameter detection.…”

Section: Measurement Science and Technologymentioning

confidence: 99%

Error motion analysis and design of a synthetic probe of thread functional diameter based on the compliant mechanism

Qiu¹,

Wang²,

Su³

et al. 2018

Meas. Sci. Technol.

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The role of the functional diameter is very important to the thread fitting property; however, the main feature of the thread is the spiral surface in space, which has many parameters and is difficult to measure. To obtain a thread functional diameter more in line with the definition of the standard, an approach based on a compliant mechanism theory is presented for the design of a synthetic measurement probe, and a multi-degree of freedom (DOF) movement of the sensitive probing element is realized. High stiffness and high flexibility of the probe are achieved in the undesired direction and direction of freedom, respectively. A method in which the error source is analyzed is adopted to evaluate the measurement uncertainty. The expanded uncertainty of the thread functional diameter measurement is 0.008 mm (k = 2), which is due to the probe mechanism error motions.

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“…However, in practice when the tested bolt is clamped on the thread fasteners, it is difficult to ensure that the thread axis completely aligns with the axis of the fixture on the detection platform, which causes the axis of the CCD camera not being perpendicular to the cross-section of threads through the axis. When the image taken by the CCD camera is processed, if the thread boundary is calculated according to the vertical section of the axis of the CCD camera and the thread across the axis, it would inevitably lead to some errors in the calculation results, as in [4], and the quality of the thread detected would not meet the industry requirements. Therefore, it is necessary Journal homepage: https://content.sciendo.com to research on the boundary correction algorithm for cylindrical external threads when the axis is inclined as shown in Fig.2.…”

Section: Introductionmentioning

confidence: 99%

Research on Modified Algorithms of Cylindrical External Thread Profile Based on Machine Vision

Gao

et al. 2020

Measurement Science Review

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In the non-contact detection of thread profile boundary correction, it remains challenging to ensure that the thread axis intersects the CCD camera axis perpendicularly. Here, we addressed this issue using modified algorithms. We established the Cartesian coordinate system according to the spatial geometric relationship of the thread. We used the center of the bottom of the thread as the origin, and the image of the extreme position image was replaced by the image of the approximate extreme position. In addition, we analyzed the relationship between the boundary of the theoretical thread image and the theoretical profile. We calculated the coordinate transformation of the point on the theoretical tooth profile and the coordinate function of the point on the boundary of the theoretical image. At the same time, the extreme value of the function was obtained, and the boundary equation of the theoretical thread image was deduced. The difference equation between the two functions was used to correct the boundary point of the actual thread image, and the fitting results were used to detect the key parameters of the external thread of the cylinder. Further experiment proves that the above algorithm effectively improves the detection accuracy of thread quality, and the detection error of main geometric parameters is reduced by more than 50 %.

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A method for detecting alignment deviation on a thread-measuring instrument

Cited by 4 publications

References 14 publications

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

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

Error motion analysis and design of a synthetic probe of thread functional diameter based on the compliant mechanism

Research on Modified Algorithms of Cylindrical External Thread Profile Based on Machine Vision

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