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Method for obtaining inlet pressure loss model coefficient through metering

A technology of inlet pressure and model coefficient, applied in the direction of electrical digital data processing, design optimization/simulation, special data processing applications, etc., can solve the problems of no disclosure, achieve accurate results, simple and easy operation of data processing process, and prevent waste Effect

Pending Publication Date: 2020-07-31
KINGFA SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at present, no effective and accurate measurement of c has been disclosed 1 and c 2 Methods

Method used

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  • Method for obtaining inlet pressure loss model coefficient through metering
  • Method for obtaining inlet pressure loss model coefficient through metering
  • Method for obtaining inlet pressure loss model coefficient through metering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] The inlet pressure loss model coefficient c of embodiment 1 polybutylene terephthalate+glass fiber 1 and c 2 the acquisition of

[0079] Grade: PBT-RG301 BK016G

[0080] Manufacturer: Kingfa Technology Co., Ltd.

[0081] Material: polybutylene terephthalate + glass fiber

[0082] 1) Obtain about 100g of the material to be tested and dry it for later use, and dry it in an oven at 120°C for 4 hours. The material is taken out of the oven and the test starts within 15 minutes to prevent secondary moisture absorption from affecting the test results.

[0083] 2) Set the high-pressure capillary test temperature to the recommended injection temperature of 240°C for the material. When the instrument reaches the test temperature, wait for about 15 minutes to keep the instrument stable.

[0084] 3) Install the capillary, put the capillary into the mounting nut, then put the mounting nut into the torque wrench connector, screw in the capillary and tighten it, tighten it with a...

Embodiment 2

[0102] Inlet pressure loss model coefficient c of embodiment 2 polycarbonate 1 and c 2 the acquisition of

[0103] Grade: Panlite L-1225LM

[0104] Manufacturer: Teijin Corporation

[0105] Material: Polycarbonate

[0106] 1) Obtain about 100g of Panlite L-1225LM material to be tested and dry it for later use, and dry it in an oven at 120°C for 4 hours. The material is taken out of the oven and the test starts within 15 minutes to prevent secondary moisture absorption from affecting the test results.

[0107] 2) Set the high-pressure capillary test temperature to the recommended injection temperature of 295°C for the material. When the instrument reaches the test temperature, wait for about 15 minutes to keep the instrument stable.

[0108] 3) Install the capillary, put the capillary into the mounting nut, then put the mounting nut into the torque wrench connector, screw in the capillary and tighten it, tighten it with a torque wrench, the torque is 65Nm. Due to the high...

Embodiment 3

[0126] Inlet pressure loss model coefficient c of embodiment 3 polycarbonate+carbon black 1 and c 2 the acquisition of

[0127] Brand: JH820-M30 BK201

[0128] Manufacturer: Kingfa Technology Co., Ltd.

[0129] Material: Polycarbonate + Carbon Black

[0130] 1) Obtain about 100g of JH820-M30 BK201 material to be tested and dry it for later use, and dry it in an oven at 120°C for 4 hours. The material is taken out of the oven and the test starts within 15 minutes to prevent secondary moisture absorption from affecting the test results.

[0131] 2) Set the high-pressure capillary test temperature to the recommended injection temperature of 295°C for the material. When the instrument reaches the test temperature, wait for about 15 minutes to keep the instrument stable.

[0132] 3) Install the capillary, put the capillary into the mounting nut, then put the mounting nut into the torque wrench connector, screw in the capillary and tighten it, tighten it with a torque wrench, t...

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Abstract

The invention provides a method for obtaining an inlet pressure loss model coefficient through metering. Inlet pressure loss and real wall shear stress can be obtained through test and calculation ofa high-pressure capillary rheometer, and two parameters c1 and c2 of an inlet pressure loss model are obtained by fitting. Specifically, the inlet pressure P of a polymer melt at different shearing rates is tested by using two capillary orifice molds respectively, so that the inlet pressure loss Pe and the real wall surface shearing stress tau are calculated and substituted into the inlet pressureloss model, and two parameters c1 and c2 of the inlet pressure loss model can be obtained by fitting regression. The method has the advantages that the single-time test sample consumption is low, theinfluence of shearing heat generation does not need to be corrected, results more accurate, and data processing is simple and easy to operate. The method has guiding significance for finding out a balance point of material fluidity and mechanical properties, selecting an injection molding machine matched with required injection pressure and designing a mold runner with a proper size, and can solve the problem of pressure distortion caused by change from coarse to fine in injection molding, so that the mold opening success rate and the qualified product yield are improved.

Description

technical field [0001] The invention belongs to the field of polymer injection molding processing, in particular to simulation in this field, and more specifically to a method for measuring and obtaining inlet pressure loss model coefficients. Background technique [0002] During the injection molding process, due to the high viscosity of the material, the polymer melt will be subjected to strong viscous resistance on the wall of the mold cavity. Especially for multi-cavity small (micro) parts, the size of the flow channel is small and the flow resistance is large. If the actual injection pressure is insufficient or the decay speed is too fast, the pressure is not enough to fill all the cavities with the material, and undershoot will occur. Note the problem, can not get qualified products. In order to improve the success rate of mold opening and the output rate of qualified products, before the actual mold opening, it is necessary to use numerical simulation methods to simu...

Claims

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Application Information

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IPC IPC(8): G06F30/20G06F119/14
CPCG06F2119/14G06F30/20
Inventor 颜杨黄险波叶南飚关安南黄明瑜
Owner KINGFA SCI & TECH CO LTD
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