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Method for measuring shrinkage rate of injection molding product by using three-dimensional digital image technology

An image technology, three-dimensional digital technology, applied in the field of injection molding, can solve problems such as the amount of deformation of objects that cannot be characterized

Active Publication Date: 2021-06-11
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the speckle on the projector will not deform along with the object under test, and will always be in place, which cannot represent the amount of deformation of the object.

Method used

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  • Method for measuring shrinkage rate of injection molding product by using three-dimensional digital image technology
  • Method for measuring shrinkage rate of injection molding product by using three-dimensional digital image technology
  • Method for measuring shrinkage rate of injection molding product by using three-dimensional digital image technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A method for measuring the shrinkage rate of injection molded products using three-dimensional digital image technology, such as Figure 1~3 shown, including the following steps:

[0035] (1) Fix the optical path: fix two CCD cameras, adjust the angle between the two CCD cameras, fix the light source, make the measured area in the visualized mold cavity evenly illuminated, open the digital image measurement software system, and compare the collected image area on the screen To adjust the aperture and focus of the CCD camera to ensure that the speckle in the measured area captured is clear and the size is appropriate; and the optical path is calibrated to establish a virtual coordinate system in space to determine the three-dimensional geometric position of a point on the surface of a space object and the point in the The relationship between corresponding points in the image, that is, the geometric model of camera imaging is established by calibrating the optical path, ...

Embodiment 2

[0050] The difference between this example and Example 1 is that the amount of silicon carbide black particles added is different, and the amount of silicon carbide added in this example is 1 / 10,000 of the total mass of the melt.

Embodiment 3

[0052] The difference between this embodiment and Embodiment 1 is that the amount of silicon carbide black particles added is different, and the amount of silicon carbide added in this embodiment is 1 / 5000 of the total mass of the melt.

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Abstract

The invention belongs to the technical field of injection molding, and particularly relates to a method for measuring the shrinkage rate of an injection molding product by using a three-dimensional digital image technology, black solid particles are added into a melt as a mark on the basis of a visual mold, and the added black solid particles have a speckle function in two-dimensional image measurement, and real-time monitoring of the thermal residual stress change of the injection molding product to be detected is realized through the steps of optical path fixing, random speckle preparation, image information acquisition, image data storage, image matching, shrinkage rate calculation and the like.

Description

technical field [0001] The invention belongs to the technical field of injection molding, and in particular relates to a method for measuring the shrinkage rate of injection molding products by using three-dimensional digital image technology. Background technique [0002] The digital image correlation method (or called the digital speckle correlation method DICM) is a photomechanical method developed rapidly in recent years. The measurement process: the speckle images of the surface before and after the deformation of the object are collected by the CCD camera, and these speckle images are converted into digital images by the analog-to-digital converter (A / D) and stored in the image acquisition card, and the images are saved on the computer or Store directly on the computer without using a frame grabber. Finally, correlation calculations are performed on the collected speckle images to obtain the surface displacement and shrinkage rate when the object deforms. [0003] Mo...

Claims

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Application Information

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IPC IPC(8): G01B11/16
CPCG01B11/16
Inventor 侯建华刘雯雯郭攀蒋晶王志李倩裴莹
Owner ZHENGZHOU UNIV
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