Injection compression molding optical grade transparent product quality on-line inspection method

Abstract

The invention discloses an online inspection method for the quality of an optical-grade transparent product of injection compression molding. 1. A high-speed camera and a projector are arranged at an observation port of a mold cavity of a visualized mold; the imaging objects of the high-speed camera and the projector are the mold cavity of the visualized mold; 2. The computer generates a standard sine wave grating signal and outputs it to the projector, and the projector projects it onto the cavity surface of the visualized mold; 3. The high-speed camera converts the light information of the cavity surface into analog image information, which is stored by the computer as the original phase image; 4. The plastic melt of the product test piece is injected into the cavity; the high-speed camera records the grating image generated on the surface of the cavity in real time and transmits it to the computer; 5. The computer restores the three-dimensional shape of the product test piece at different times in real time; 6. The test is qualified The three-dimensional shape of the part is used as the real-time three-dimensional shape of the standard product sample; Seventh, the phase difference images at different moments of real-time injection molding are compared with the real-time three-dimensional shape of the standard product in step six.

Description

Technical field [0001] The invention involves the online testing method of injection molding products, especially the quality of online testing methods for injection compression into optical -level transparent products. Background technique [0002] At present, injection of compression molding is no longer limited to making small -sized and high -precision optical products, and it has also begun to make large -sized transparent parts such as aviation and automobiles.When injecting compression molding, the process parameters have an important impact on the quality of the product: the unreasonable setting of the process parameters will cause the transparent product to fill the dissatisfaction, the warpan deformation, the contraction unevenness, the air bubble, the air marks, the flow pattern and other defectsThese molded defects seriously affect the final quality of the product, and these quality indicators include appearance, mechanics and functional quality indicators. [0003] S...

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Problems solved by technology

[0003] Some scholars have proposed to use the visualized mold to compare the shape of the surface pattern during the product filling process with the preset qualified product pattern, and to analyze whether the injection flow is normal by comparing the surface pattern with the set image at different times, so as to control the flow of the product. On-line monitoring of molding, but this method of processing and recognizing the surface pattern of the flow process with image pixels has low recognition accuracy, and has not yet realized real-time detection of product molding quality such as slight warpage deformation or uneven shrinkage

[0004] On-line inspection of the quality of injection compression molding optical-grade transparent products can observe the real-time flow conditions in the visualized mold cavity, provide a reliable basis for optimizing process parameters, and quickly and efficiently identify unqualified products. It has great potential in engineering applications. Huge economic value, but not yet reported on this aspect

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