Compensation method for measuring pitch diameter of thread through machine vision
A technology of machine vision measurement and thread pitch diameter, which is applied in the direction of measuring devices, instruments, and optical devices, etc., can solve the problem that it is difficult to obtain accurate thread pitch diameter parameters, and achieve the effect of improving accuracy
Active Publication Date: 2020-02-28
SHAANXI SCI TECH UNIV
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[0003] The purpose of the present invention is to provide a compensation method for machine vision to measure thread pitch diameter, which solves the problem that it is difficult to accurately obtain thread pitch diameter parameters in current machine vision thread measurement
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[0058] The invention relates to a method for compensating the pitch diameter of a thread measured by machine vision, which relates to a method for realizing pitch diameter compensation by using the fluctuating amount after obtaining the tooth flank angle variation amount through a comparison method on the thread profile image of the machine vision.
[0059] As shown in Figure 1, due to the influence of the helix angle of the thread flank, the thread image obtained by using the beam perpendicular to the thread axis will be distorted, and the degree of distortion of the tooth profiles on both sides of the thread is not the same.
[0060] Such as figure 1 As shown in , let the relative tooth profile (that is, the tooth profile of the thread ring groove surface without helix angle) be the tooth profile P 1 A 1 ,P 1 B 1 , and P 1 A 1 slope is K L1 , P 1 B1 slope is K R1 , A 1 A 2 In order to compare the position of the median diameter of tooth 1 and tooth 2, that is, A 1...
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The invention discloses a compensation method for measuring a pitch diameter of thread through machine vision. The compensation method specifically comprises the following steps of: the step 1, obtaining a left flank angle [beta]0 and a right flank angle [gamma]0 of a thread to be measured; the step 2, acquiring a left flank angle [beta]1 and a right flank angle [gamma]1 of the thread to be measured by adopting an image measuring instrument of a machine vision method; the step 3, solving a right flank angle variable quantity and a left flank angle variable quantity of the thread; the step 4, calculating the total compensation amount of the left side edge and the right side edge of the pitch diameter of the thread at the upper side and the total compensation amount of the left side edge andthe right side edge of the pitch diameter of the thread at the lower side; the step 5, calculating the corrected pitch diameter total compensation amount [delta]d2 of the left flank angle and the right flank angle of the upper side and the lower side of the thread; the step 6, compensating the pitch diameter d2C of a single thread measured by the image measuring instrument or the machine vision method to obtain the pitch diameter d2 of the thread; and the step 7, recursively obtaining respective compensation amounts of the pitch diameters of the threads of the n teeth. The problem that threadpitch diameter parameters are difficult to obtain accurately in existing machine vision thread measurement is solved.
Description
technical field [0001] The invention belongs to the technical field of thread measurement and relates to a compensation method for measuring the pitch diameter of a thread by machine vision. Background technique [0002] The thread pitch diameter is defined as the diameter of an imaginary cylinder whose tooth width is equal to the tooth socket width on the thread shaft section, and its accurate measurement has always been a difficult problem in thread measurement. The traditional method uses the three-needle method to approximate the measurement of the pitch diameter of the thread. During the measurement, it is necessary to select the measuring needle for different pitches, and the measurement process is completed manually, and the measurement efficiency is low. Using the backlight machine vision method to detect threads can easily obtain the thread profile, and then obtain the parameters of the thread, which has been widely used in recent years. The slope on both sides of ...
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Login to View More IPC IPC(8): G01B11/08G01B11/26
CPCG01B11/08G01B11/26
Inventor 陈曼龙
Owner SHAANXI SCI TECH UNIV