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Thread detection method based on three-dimensional modeling

A three-dimensional, detection method technology, applied in the field of thread detection and thread virtual detection, can solve the problems of inspection error, time-consuming, labor-intensive, etc., and achieve the effect of simple and tedious work, simple and easy method, and accurate detection.

Pending Publication Date: 2022-01-21
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this inspection method relies on manual labor. In the actual production process, when encountering large-scale inspections, this inspection method is time-consuming and labor-intensive.
Moreover, the thread gauge will inevitably wear out during long-term use, which brings a lot of error to the inspection

Method used

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  • Thread detection method based on three-dimensional modeling
  • Thread detection method based on three-dimensional modeling
  • Thread detection method based on three-dimensional modeling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] In this example, see Figure 1-Figure 6 , a thread detection method based on three-dimensional modeling, which establishes two triangulated models of plug gauge helicoids with different sizes, and uses these two triangulated models to detect the actual internal thread scanning point cloud in the same way as the external thread detection method. Including the following steps:

[0064] (1) Obtain the actual measured 3D scanning point cloud of the detected thread:

[0065] Through the information collection and information preprocessing of the detected thread, the actual measured 3D scanning point cloud of the detected thread is obtained as the actual measured point cloud to be matched;

[0066] (2) Establish the helicoid triangulation model of the go-gauge and the stop-gauge:

[0067] According to the use method of the go-no-go gauge used in the actual inspection, the helical surface triangulation model of the go-gauge and the no-go gauge with the tooth profile aligned ...

Embodiment 2

[0074] This embodiment is basically the same as Embodiment 1, especially in that:

[0075] In this embodiment, in the step (3), by translating the rotation matrix, the overall point cloud is translated and rotated around the axis of the CAD model or the axis of the triangulated model of the general helicoid, simulating the actual screw thread engagement The spiral progress of the process corresponds to the screwing process when the thread is actually inspected with the go-gauge and stop gauge, and is used to measure different positions of the actual measurement point cloud.

[0076] In the present embodiment, in the step (2), the positive or negative of the distance from the point of the actually measured point cloud to the triangular surface of the triangulated model is defined, and the direction of the surface of the triangulated model of the general helical surface is set to face inwards. The surface direction of the regular helical surface triangulation model is set to fac...

Embodiment 3

[0103] This embodiment is basically the same as the above-mentioned embodiment, and the special features are:

[0104] In this example,

[0105] Such as figure 2 Shown is a triangulated model of the go-no-go helicoid, with the face oriented inward and the face oriented outward. image 3 The CAD model has the same ideal tooth shape as the triangularized model of the general gauge, and the pitch diameter is between the triangularized model of the general gauge and the anti-helical surface. Figure 4 It is the actually measured and preprocessed point cloud, which contains the spatial x, y, and z coordinates of each point on the actual thread surface.

[0106] First, the actual measurement point cloud and the CAD model are registered. Firstly, rough registration is performed, and after coarse registration, fine registration randomly samples enough points on the point cloud and the surface of the CAD model. These points are not connected at first. It is necessary to find the co...

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Abstract

The invention discloses a thread detection method based on three-dimensional modeling. The method comprises the following steps: establishing two plug gauge helical surface triangulation models with different sizes; using the two triangulation models for detecting actual internal thread scanning point clouds by imitating an external thread detection mode, comprising the steps of obtaining actual measurement three-dimensional scanning point clouds of detected threads, establishing spiral surface triangulation models of the go gauge and the no-go gauge and performing a virtual measurement process. According to the method, from the perspective of virtual matching, a check method of a go-no go gauge is used for reference; for the actual measurement of a three-coordinate instrument and the like, a three-dimensional point cloud of a thread is built, and thus enabling the three-dimensional point cloud to rotate to pass through the created helicoid triangulation model of the standard go gauge and the standard no-go gauge which are coaxial; the distance from each point of the screw-in part point cloud to the two triangular surfaces is calculated through the distance from the point to the surface; and the distances are subjected to statistical analysis, so that whether the thread is qualified or not is judged, and the tedious work of actual measurement and inspection can be greatly simplified. The method is based on a go-no go gauge inspection mode, and the inspection efficiency is improved.

Description

technical field [0001] The invention relates to a thread detection method, in particular to a thread virtual detection method, which is applied in the technical field of mechanical connector detection and quality evaluation. Background technique [0002] As the most common connection in machinery, thread directly affects the assembly accuracy, reliability, and service life of mechanical products. Inaccurate thread parameters will cause problems such as loose connection, falling off, loss of torque, pre-tightening force, deformation, premature fatigue damage, and vibration relaxation. Therefore, in some special fields, especially aerospace, the high-precision machining and inspection of threads is particularly important. [0003] The main parameters of the thread are major diameter, minor diameter, pitch diameter, pitch, tooth angle, etc. Thread measurement methods include single-parameter measurement and comprehensive measurement. Among them, the most common one in compreh...

Claims

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Application Information

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IPC IPC(8): G06T7/00G06T17/00G01B21/00G01B21/20
CPCG06T7/0004G06T17/00G01B21/00G01B21/20G06T2207/10028G06T2207/30164G06T2200/08
Inventor 韦庆玥李明王辉
Owner SHANGHAI UNIV
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