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Rapid calculation method for mold water heating and mold temperature controller parameter calculation method

A fast calculation and mold heating technology, applied in design optimization/simulation, etc., to achieve fast solution, efficient mold temperature machine parameter calculation, and strong adaptability

Pending Publication Date: 2020-07-28
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the water heating simulation of injection molds, the research is still blank
Since water heating relies on flowing hot water to heat the mold, and the flow rate of the hot water is relatively fast, it encountered insurmountable problems when using CFD software

Method used

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  • Rapid calculation method for mold water heating and mold temperature controller parameter calculation method
  • Rapid calculation method for mold water heating and mold temperature controller parameter calculation method
  • Rapid calculation method for mold water heating and mold temperature controller parameter calculation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0130] Embodiment 1: 267 mold heating.

[0131] It is known that the ambient temperature is 25°C, the initial mold temperature is 25°C, the hot water temperature is 90°C, the water flow velocity is 2.7m / s, the heating time □=1800s, find the mold temperature after the heating time □.

[0132] The steps that adopt fast algorithm of the present invention to calculate are as follows:

[0133] Step 1: Perform similarity transformation on heating water attributes.

[0134] According to the selection requirements of the conversion coefficient α, that is, the water velocity should be less than 1, and the similar conversion coefficient α=1 / 6 is taken, then the heating time of the similar model is αβ=1800 / 6=300, and the similar transformation of the heating water speed and density is as follows: ( Water density before transformation is ρ f =1))

[0135] ρ f1 = ρ f / α=6ρ f =6×10 -9 kg / m 3 ;

[0136] u 1 =αu=u / 6=0.45m / s.

[0137] Step 2: Perform a similarity transformation on t...

Embodiment 2

[0143] Embodiment 2: 295 mold heating.

[0144] It is known that the ambient temperature is 25°C, the initial mold temperature is 25°C, the hot water temperature is 90°C, the water flow velocity is 3.68m / s, and the heating time□=1800s.

[0145] Adopt its calculation steps of fast algorithm of the present invention as follows:

[0146] Step 1: Perform similarity transformation on heating water attributes.

[0147] Get similar transformation coefficient α=1 / 6, then the heating time of similar model is αβ=1800 / 6=300, and heating water velocity and density similar transformation are as follows: (ρ before transformation f =1))

[0148] ρ f1 = ρ f / α=6ρ f =6×10 -9 kg / m 3 ;

[0149] u 1 =αu=u / 6=0.45m / s.

[0150] Step 2: Perform a similarity transformation on the mold solid properties.

[0151] Transform with the same similarity conversion coefficients as in step 1, where the similarity specific heat capacity parameter for solids is calculated as:

[0152] c 1 =c / 6.

[0...

Embodiment 3

[0156] Embodiment 3: Calculation of the parameters of the water heating mold temperature machine.

[0157] The 295 mold is known, the ambient temperature is 25°C, the initial mold temperature is 25°C, the heating water temperature is 90°C, the heating time □=1800s, and the cross-sectional area of ​​the water outlet of the known mold temperature controller is A=π×25mm 2 .

[0158] Requirements: Heat the mold temperature to 88°C within the specified heating time □, that is, T m =88°C, T in Kelvin temperature unit m =361.15K, find the required heating water flow.

[0159] Analysis steps:

[0160]1) Calculate the length of the mold waterway as 2.2m, round it up to 2m, and give the range of the hot water flow rate according to the range of the hot water flow rate of the mold temperature controller [u a ,u b ]=[1,4]m / s, allowable error ε=0.1;

[0161] Select a measuring point on the mold, that is, the temperature of the point represents the mold temperature, and the coordinate...

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Abstract

The invention discloses a rapid calculation method for mold water heating and a mold temperature controller parameter calculation method. The method comprises the following steps: the step 1) carryingout heating water motion similarity transformation, i.e., converting an actual mold heating time domain into a heating time domain and a heating space domain of the similar model and keeping unchanged, and carrying out similarly transformation on the heating water density and heating water speed by using a transformation coefficient alpha in the time domain transformation at the same time; the step 2) carrying out similarity transformation of the heated mold, i.e., keeping the space domain unchanged by using the transformation coefficient alpha of the same time domain transformation in the step 1), and meanwhile, enabling the specific heat capacity of the solid to be subjected to similarity transformation through the transformation coefficient in the time domain transformation in the step1); and the step 3) carrying out simulation solution on the similar models obtained by transformation in the step 1) and the step 2) by adopting CAE simulation analysis software which is the same asthe original model. According to the method, the similarity model of the original model of the water heating mold is constructed by adopting a similarity transformation method, simulation is performedon the similarity model compared with direct simulation on the original model, and the simulation time is greatly shortened on the premise of ensuring the precision.

Description

technical field [0001] The invention relates to the technical field of injection mold water heating simulation calculation, in particular to a fast algorithm for mold water heating and an algorithm for calculating parameters of a mold temperature controller. Background technique [0002] Injection molds need to be heated to a certain temperature of 80-90°C before injection molding production, and the common methods of heating molds include electric heating, oil heating and water heating. Considering the factors of safety and environmental protection, water heating has become the mainstream in recent years, and the water heating equipment mold temperature controller is an ideal equipment for mold heating water circulation. The parameters of the water heating mold include water temperature, water flow rate and cross-sectional area of ​​the water outlet of the mold temperature controller. To heat a specific mold with water, it is necessary to determine the flow rate and heating...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20B29C45/73B29C45/17
CPCB29C45/73B29C45/17B29C2045/1784
Inventor 刘红陈飞陈豪杰
Owner ZHEJIANG UNIV OF TECH
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