Injection molding impeller warping defect detection method based on point cloud feature comparison

Abstract

The invention discloses an injection molding impeller warping defect detection method based on point cloud feature comparison. The method includes registering the two groups of point clouds on the basis of the actual measurement point clouds of the injection molding impeller and the template point clouds of the impeller model, and unifying the two groups of point clouds into one coordinate system;comparing the spatial positions of the two groups of point clouds to obtain a dangerous area where warping defects may occur, and extracting actual measurement point clouds and template point cloudsof the dangerous area; performing segmentation, and whether warping occurs in the dangerous area is judged according to the obtained number of the point cloud clusters; performing impeller blade suction surface point cloud extraction on all the warped actual measurement point cloud clusters and template point cloud clusters; matching the actual measurement point cloud cluster and the template point cloud cluster which are warped at each position; and calculating the warping degree of each warpage. Whether the warping defect exists in the injection molding impeller or not can be detected through comparison of the spatial positions of the three-dimensional point clouds, quantitative detection of the warping defect of the impeller is achieved by calculating the warping degree, and a rapid andconvenient mode is provided for warping detection of the impeller.

Description

technical field [0001] The invention relates to a method for detecting warping defects of injection molding impellers based on point cloud feature comparison, in particular to a method for detecting warping defects of injection molding impellers based on point cloud feature comparison. Background technique [0002] Thin-wall injection molding technology is a new technology developed on the basis of traditional injection molding for the production of thin-wall products. Due to its unique advantages, it is more and more used in actual production. However, due to the thin wall thickness of thin-walled injection molded parts, the polymer melt cools rapidly in the cavity, making molding more difficult, which brings great difficulties to the quality control of plastic parts. main flaw. [0003] Many impellers are currently manufactured by injection molding. Since the impeller blades are generally thin-walled, warping and deformation are prone to occur during the actual manufactur...

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Problems solved by technology

[0005] In order to solve the technical problem of the present invention, the purpose of the present invention is to overcome the difficulties in the detection of impeller warpage defects in the prior art, and it is difficult to obtain suitable quantitative detection, etc., and to provide a warpage defect detection of injection molded impeller based on point cloud feature comparison method

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