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An external gas-assisted injection molding method and molding equipment based on ultrasonic measurement

An external gas and ultrasonic measurement technology, applied in the field of external gas assisted injection molding, can solve the problems of complex judgment method of external auxiliary molding equipment, unable to prepare to judge the timing of gas injection, unable to significantly eliminate sink marks, etc., and achieve simple and fast gas injection time. , The effect of improving product quality and removing sink marks on the surface of plastic parts

Active Publication Date: 2019-12-31
ZHEJIANG UNIV OF TECH
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  • Claims
  • 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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  • An external gas-assisted injection molding method and molding equipment based on ultrasonic measurement
  • An external gas-assisted injection molding method and molding equipment based on ultrasonic measurement
  • An external gas-assisted injection molding method and molding equipment based on ultrasonic measurement

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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 condensate layer and the time in the pressure-holding cooling stage without the intervention of external air. At this time, the melt 15 in the cavity is injected to complete the mold filling, the melt in the cavity begins to cool and shrink, and the condensation layer begins to form. At the same time, the distance between the inner wall of the mold cavity and the condensation layer begins to grow and gradually increases. In the figure, t0-t5 represents the pre-stage of pressure-holding cooling. The control device divides the pre-stage of pressure-holding cooling according to the time interval of ultrasonic emission, namely 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 the pressure-holding cooling. At this time, the distance between the mold cavity and the conde...

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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 air-assisted injection molding, and specifically relates to an external air-assisted injection molding method and molding equipment based on ultrasonic measurement. Background technique [0002] With the rapid development of the plastics industry and injection molding technology, plastic products are gradually developing in a lighter, thinner, more personalized, and more complex direction. This requires injection molded products to meet certain strength and rigidity requirements while having higher The surface quality and precision. However, defects such as surface sink marks and overall shape warping caused by the shrinkage of plastic parts will seriously affect the quality and accuracy of the molded surface of the product. The traditional process uses the method of increasing the holding pressure and holding time. Although the shrinkage of the product can be reduced to a certain extent, the increas...

Claims

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Application Information

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Patent Type & Authority Patents(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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