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Digitalized design method of rubber product extrusion die

A rubber product and design method technology, applied in the direction of electrical digital data processing, calculation, special data processing applications, etc., can solve problems such as extrusion molding process analysis, improve product performance and quality, reduce production costs, and shorten development cycle effect

Inactive Publication Date: 2005-03-16
SAIC METZELER SEALING SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since this technique does not involve extrusion characteristics such as outlet expansion and wall surface slippage, it cannot be used to analyze the extrusion molding process of rubber products

Method used

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  • Digitalized design method of rubber product extrusion die
  • Digitalized design method of rubber product extrusion die
  • Digitalized design method of rubber product extrusion die

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] refer to image 3 Explain that the present invention calculates the shape of the extruded product according to the geometric shape of the mold, and determines the deformation law of the extruded product.

[0021] 1 Establishing a mathematical model (S61)

[0022] Usually rubber melt can be simplified as a viscoelastic incompressible fluid, and its flow governing equation can be expressed as

[0023] Mass Conservation Equation:

[0024] ·v=0

[0025] Momentum Conservation Equation:

[0026] Re dv dt = - ▿ · p + ▿ · τ + f

[0027] Where v is the velocity, Re is the Reynolds quasi-number, p is the pressure, f is the body force, and τ is the deviatoric stress when the viscoelastic fluid flows.

[0028] fluid constitutive equation

[0029] The rubber melt can be represented by the Phan-Thien-Tanner (PTT)...

Embodiment 2

[0052] refer to image 3 Description The present invention calculates the geometry of the die based on the desired shape of the extrudate (ie, the shape of the article).

[0053] The geometry of the mold is calculated according to the shape of the extrudate, and the calculation process is basically the same as that of Example 1. The calculation steps of Example 1 are S61-S65, and the calculation steps of Example 2 are increased by S66 and S67. Calculation step S66 is to judge whether the required die shape satisfies the design requirements according to the calculation results. If the requirements are met, the calculation ends; if not, the calculation parameters are corrected (S67), and S65 is repeated until the design requirements are met. Figure 7 is the die shape calculated from the shape of the extrudate.

[0054] Since the calculation purposes of Embodiment 2 and Embodiment 1 are different, their grid reset areas are different. For the area settings, see Figure 5 .

...

Embodiment 3

[0058] image 3 The setting mathematical model parameters (S61) in the description of the determination method of the constitutive model parameters of different rubber materials.

[0059] In order to determine the constitutive model parameters, the following rheological experiments are required:

[0060] (1) Capillary rheometer experiment: used to determine the relationship between shear rate and viscosity in the high shear rate range;

[0061] (2) Rotational rheometer experiment: used to determine the relationship between shear rate and viscosity in the low shear rate range;

[0062] The parameters in the constitutive model can be obtained by fitting the rheological experimental data of the rubber material. Table 1 shows the material parameters of the PTT model of EPDM and SBR, which can be used to simulate the rubber extrusion process. Figure 6 and Figure 7 is the calculation result obtained from the material parameters of EPDM in Table 1 using the PTT model.

[0063]...

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Abstract

The invention relates to a rubber product extrusion finish mold digital designing method, which inserts three steps between the finish mold designing and the finish mold elaboration based on the try and error method. The steps are the finish mold computer assisted engineering analysis, determining whether the analysis result satisfies the demand, modifying the finish mold designing. The finish mold computer assisted engineering analysis is the critical step of the invention, which is composed of the following steps. Choose a suitable flux constitutive equation. The coefficients of the equation are extracted by matching the result of the rubber material rheologic experiment. With the CAD technique, the geometrical model is setup. Proceed the grid division and determinate the end condition. Choose the finite element method and the calculating parameter. Then proceed the calculation. Proceed the deforming analysis and the stress analysis of the result to determine whether the shape of the acquired finish mold satisfies the designing demand. In this way, the modifying times of the finish mold is decreased, and the yield of the rubber product is improved.

Description

Technical field: [0001] The invention provides a mold design method, in particular to a digital design method of a rubber product extrusion die. Background technique: [0002] In the prior art, what the design processing of rubber product extrusion die adopts is trial and error method (see figure 1 ), consisting of the following steps: die design (S1), die processing (S2), product trial production (S3), checking whether the product shape meets the design requirements (S4), and correcting the die (S5). Since S1 is carried out based on experience, it needs to be repeated many times from S3 to S5, so the product trial production time is too long and the cost is high; the unreasonable S1 will also make it difficult to improve the production yield. [0003] In 1997, Xifeng Shangxiu and others used the finite element method (FEM) to simulate thermal shrinkage deformation of plastic products, and invented a metal mold design method for resin containers taken out of the metal mold ...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCB29C47/0854B29C48/251
Inventor 赵建才周持兴王刚
Owner SAIC METZELER SEALING SYST
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