A Calculation Method for Solving the Shading Amount of Axial Sectional Profile in Vertical Projection

A technology of vertical projection and calculation method, which is applied in the direction of measuring devices, instruments, optical devices, etc., can solve problems such as thread parameter measurement errors, and achieve the effect of improving accuracy

Active Publication Date: 2019-04-05
SHAANXI SCI TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a calculation method for solving the occlusion amount of the axial cross-section tooth shape in vertical projection, which solves the problem of error caused by the influence of the helix angle to the thread parameter measurement

Method used

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  • A Calculation Method for Solving the Shading Amount of Axial Sectional Profile in Vertical Projection
  • A Calculation Method for Solving the Shading Amount of Axial Sectional Profile in Vertical Projection
  • A Calculation Method for Solving the Shading Amount of Axial Sectional Profile in Vertical Projection

Examples

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Embodiment 1

[0047] Take a certain flank of a cylindrical triangular thread as an example, such as figure 2 As shown, N is the shaft section through the cylindrical thread axis OO, S i and S j is any two helical lines on the ipsilateral tooth profile (d i and d j Cylindrical helix S i and S j diameter, and d i j ), which respectively intersect A with the axial section N i and A j , due to the tooth form angle α, on the axial section N, point A i has a z-coordinate greater than point A j The z coordinate, when the helix S j Point A on the axial section j Turn along its helix angle through the extended helix angle γ angle to be B j , the helix S j up and point A i point B in the same direction as the coordinate x j It will be because its z coordinate value is greater than A i , and form a occlusion; all gyration diameters are greater than d i Helix S j can result in A i Due to the different types and sizes of thread angles α and lead angles are different, and there are man...

Embodiment 2

[0049] Take the triangular thread with straight profile as an example, such as image 3 As shown, for a flank tooth profile QP′ obtained by vertical projection, the middle point A 2 ′ and P′ at the root of the tooth extend the helical surface occlusion Δ 2 and Δ 1 , recover the real point A on the tooth profile by calculating the difference of the z coordinates 2 and P, the crown Q cannot be occluded, as long as it is simply connected to QA 2 P, the real tooth profile can be approximated.

[0050] The present invention is a calculation method for calculating the amount of tooth shape occlusion of an axial section when vertical projection is used. The method can be used to estimate the amount of tooth shape occlusion at each diameter of the thread when vertical projection is used to measure threads, and improve the accuracy of tooth shape parameters when vertical projection is used for measurement. accuracy. In particular, the estimation of the occlusion at the tooth root ...

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Abstract

The invention discloses a calculation method for calculating the tooth-shaped shielding amount of an axial section during the vertical projection. According to the technical scheme of the method, firstly, a coordinate system is established, and a shielding spiral line and a shielded spiral line, share the same starting point, are drawn into the above coordinate system. Secondly, a figure is constructed to figure out the coordinate difference between the above shielding spiral line and the above shielded spiral line, and the actual position of the shielding spiral line corresponding to the shielded spiral line is drawn according to the coordinate difference. Finally, after the shielding spiral line at the actual position is rotated at a certain angle relative to the shielded spiral line, the coordinate rising amount of the shielding spiral line is calculated. The above steps are repeated, and then the coordinate rising amount of each shielding spiral line relative to the shielded spiral line is calculated, wherein the maximum value is the obtained shielding amount. Based on the above method, the tooth-shaped shielding amount at each diameter part of a thread can be estimated during the thread measurement of the vertical projection. Meanwhile, the accuracy of tooth-shaped parameters during vertical projection measurement is improved. Especially for the estimation of the shielding amount at a tooth root, the pitch diameter of a thread and the minor diameter of the thread during vertical projection measurement can be accurately obtained through compensation.

Description

technical field [0001] The invention belongs to the technical field of thread measurement, and relates to a calculation method for solving the shielding amount of an axial section tooth shape in vertical projection. Background technique [0002] With the development of machinery manufacturing industry, the high efficiency requirements for thread measurement and the continuous improvement of image sensor resolution, the projection measurement of thread parameters has been more and more used in production practice. According to the thread specification, the standard geometric parameters of the thread refer to the profile characteristic parameters of the thread shaft section, so the profile image of the thread shaft section can be easily obtained by using vertical projection. [0003] However, due to the influence of the helix angle, the extended helical surface of the thread tooth will block the vertical projection image of the thread profile axis section during vertical proje...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/24
CPCG01B11/2425G01B11/2433
Inventor 陈曼龙
Owner SHAANXI SCI TECH UNIV
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