Plastic part pre-deformation part modeling method, system and device and storage medium

Abstract

The invention discloses a plastic part pre-deformation part modeling method, system and device and a storage medium, and the method comprises the following steps: obtaining the 3D scanning data of a test piece, and obtaining the point cloud data of the test piece according to the 3D scanning data; carrying out reverse molding on the point cloud data to obtain a test piece model; comparing the testpiece model with an originally designed plastic piece model to obtain a pre-deformation surface; acquiring a plurality of coordinate points on the pre-deformation surface; obtaining a plurality of vector values of the buckling deformation position of the test piece according to the coordinate points; performing curve fitting on the vector deviation data to obtain a buckling deformation trend anda buckling deformation starting point of the test piece; and modifying the originally designed plastic part model to obtain a 3D model of the pre-deformed part. Accurate data can be provided for plastic part pre-deformation modeling, the reliability of plastic part pre-deformation is effectively improved, and the method, system and device can be widely applied to the technical field of plastic product manufacturing.

Description

technical field [0001] The invention relates to the technical field of plastic product manufacturing, in particular to a modeling method, system, device and storage medium for pre-deformed parts of plastic parts. Background technique [0002] With the continuous development of the national economy, China has become a big country in the production and consumption of plastics. The annual consumption of plastics is as high as 90 million tons, and the market revenue has reached 2.6 trillion yuan. In the injection molding process of plastic parts, the most prominent problem is the warping and deformation of plastic parts. If the warping deformation of plastic parts is small, it is generally improved by adjusting the process parameters in the injection molding production process. However, if the warping deformation of the plastic parts is large, it is generally difficult to obtain qualified plastic parts only by modifying the process parameters in the injection molding production...

AI Technical Summary

Problems solved by technology

[0005] 1. This method does not clearly explain the method of error comparison, and it will consume a lot of time if a large number of data points are compared;

[0006] 2. No quantitative analysis was carried out when modifying the model, and the data of the surface model was directly modified;

But these two methods have the following problems: 1. For the simulation method, since the mold flow analysis software is only a simulation software, there must be some errors between the analysis results and the actual results, and according to practical experience, the errors will be Increases with the increase of the warpage deformation of the product

At the same time, in the actual analysis process, there are many parameters that cannot be obtained in the mold flow analysis, such as the material parameters and crystallization data of some enterprises, the changing water temperature and mold temperature, etc.

This will lead to further amplification of the error of the mold flow analysis results, and the expected pre-deformed part model cannot be obtained.

2. For the test mold method, this is a relatively reliable method, but because the measurement method is manually measured by a vernier caliper, certain errors will occur, and it is not suitable for products with high precision requirements

At the same time, for structures with a large span, the vernier caliper will not be able to measure, even if the three-coordinate measurement is used, there are still problems such as fixture production and some structures cannot be measured by three-coordinate

As a result, these positions can only be estimated with approximate values, and the most accurate data cannot be obtained, and thus the desired pre-deformed part model cannot be obtained

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