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A method of estimating the non-Newtonian exponent of resin material by using injection molding machine

A non-Newtonian, resin material technology, applied in the field of injection molding, can solve the problems of high cost, complicated capillary structure and assembly, and achieve the effects of high accuracy, convenient operation and simple process flow

Active Publication Date: 2017-06-13
GUANGZHOU HKUST FOK YING TUNG RES INST
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  • Abstract
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Problems solved by technology

The disadvantage of this design is that the structure and assembly of the capillary are more complicated and the cost is higher

Method used

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  • A method of estimating the non-Newtonian exponent of resin material by using injection molding machine
  • A method of estimating the non-Newtonian exponent of resin material by using injection molding machine
  • A method of estimating the non-Newtonian exponent of resin material by using injection molding machine

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Embodiment Construction

[0034] refer to figure 1 , the present invention is a kind of method that utilizes injection molding machine to estimate non-Newton index of resin material, comprises the following steps:

[0035] 1) Record the parameters of the injection molding machine, including the inner diameter r of the barrel 1 and the structural parameters within the range from the pressure sensor 4 to the front end of the nozzle 3, including the radius R and length l of each circular pipe runner, and the radius R1 at both ends of the conical pipe runner and R2 and the convergence angle α of the conical tube flow channel;

[0036] 2) Heat the injection molding machine for a period of time, so that the temperature at the nozzle 3 and the adapter 2 on the injection molding machine is constant and evenly distributed, and the air injection experiment is started, and the temperature of the injection molding machine is still maintained during the air injection experiment. constant and uniform distribution o...

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Abstract

The invention discloses a method for estimating a non-Newtonian index of a resin material by utilizing an injection molding machine. The method comprises the following steps: arranging a pressure sensor in the injection molding machine to measure integral total pressure drop data in the injection molding machine and calculating theoretical pressure drop of each position according to the dimension of each part on the injection molding machine and an adaptor; and carrying out linear fitting to obtain the non-Newtonian index of the material. The method is convenient in operation and simple in step flow; and results obtained by virtue of the linear fitting are high in accuracy. The method is used for the field of injection molding.

Description

technical field [0001] The invention relates to the field of injection molding, in particular to a method for estimating the non-Newton index of resin materials by using an injection molding machine. Background technique [0002] During the injection molding process, understanding the flow characteristics of the molten resin in the injection molding machine and the mold is very important for judging the processing performance of the resin and the quality of the injection product. Flow properties here refer to the viscosity as well as the non-Newtonian index of the material. The flow characteristics of the resin determine its flow in the injection molding machine and the mold when it is subjected to a certain force, and it has guiding significance for parameter setting and quality control, but this data is not provided in the material supplier's manual. [0003] The commonly used method of determining material properties is realized by equipment such as capillary rheometers ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C45/76B29C45/77
CPCB29C45/76B29C45/77B29C2945/76006
Inventor 刘超姚科高福荣
Owner GUANGZHOU HKUST FOK YING TUNG RES INST
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