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External gas assisted injection molding method based on ultrasonic measurement and molding equipment

An external gas and ultrasonic measurement technology, applied in the field of external gas-assisted injection molding, can solve the problems of complex judgment methods for external auxiliary molding equipment, the inability to prepare and judge the timing of gas injection, and the inability to significantly eliminate sink marks, etc., to achieve simple and fast gas injection time , improve product quality, and remove sink marks on the surface of plastic parts

Active Publication Date: 2017-06-13
ZHEJIANG UNIV OF TECH
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

It can solve the problem that the existing equipment cannot be prepared to judge the reasonable gas injection timing and the judgment method is too complicated, and the problem that the external auxiliary molding equipment is prone to gas breakdown of the plastic part or cannot significantly eliminate the sink marks

Method used

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  • External gas assisted injection molding method based on ultrasonic measurement and molding equipment
  • External gas assisted injection molding method based on ultrasonic measurement and molding equipment
  • External gas assisted injection molding method based on ultrasonic measurement and molding equipment

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Experimental program
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Embodiment 1

[0052] Such as figure 2 As shown, the schematic diagram is a graph of the relationship between the thickness of the condensed layer and the time during the pressure holding and cooling stage without the intervention of external air. At this time, the injection molding of the melt 15 in the cavity completes the mold filling, the melt in the cavity begins to cool and shrink, and the condensation layer begins to form, while the distance between the inner wall of the mold cavity and the condensation layer begins to generate and gradually increases. In the figure, t0-t5 represents the early stage of pressure-holding cooling, and the control device divides the early stage of pressure-holding cooling according to the time interval of ultrasonic emission, that is, t0-t1; t1-t2; t2-t3; t3-t4; t4-t5; A total of 5 time intervals, t6 means that the melt is basically solidified and not shrinking in the later stage of pressure holding and cooling. At this time, the distance between the mol...

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Abstract

The invention discloses an external gas assisted injection molding method based on ultrasonic measurement and molding equipment. The equipment comprises an injecting mold; the injecting mold is provided with a pouring gate, a cavity, a gas needle, a gas inlet channel, a material pulling rod and an ultrasonic probe; the ultrasonic probe is connected with a signal processing device; the signal processing device is connected with a control device and a gas assisted control device in sequence; the gas assisted control device is connected with the gas needle through the gas inlet channel; and compressed air in the gas assisted control device enters the cavity through the gas needle. According to the external gas assisted injection molding method based on the ultrasonic measurement and the molding equipment, an ultrasonic detection technology is reasonably used for external assisted molding equipment, proper gas injection time is simply and rapidly judged and the production efficiency is improved; and meanwhile, shrink marks on the surface of a molded part can also be effectively removed and the product quality is improved.

Description

technical field [0001] The invention belongs to the technical field of external gas-assisted injection molding, and in particular relates to an external gas-assisted injection molding method and molding equipment based on ultrasonic measurement. Background technique [0002] With the rapid development of the plastic industry and injection molding technology, plastic products are gradually developing towards lighter, thinner, more personalized, and more complex directions. This requires injection molding products to meet certain strength and stiffness requirements. surface quality and precision. However, defects such as surface sink marks and overall shape warping due to shrinkage of plastic parts will seriously affect the quality and precision of the product's molding surface. In the traditional process, the method of increasing the holding pressure and holding time can reduce the shrinkage of the product to a certain extent, but at the same time increasing the holding pres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/17B29C45/76
CPCB29C45/174B29C45/76B29C2945/76551B29C2945/76779B29C2945/76839B29C2945/76973
Inventor 李吉泉贾亚东鲁聪达赵朋姜少飞赵佳伟
Owner ZHEJIANG UNIV OF TECH
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