CN112287585B - Thermoelectric indirect coupling simulation method for thin-wall capillary tube electric-assisted drawing forming - Google Patents
Thermoelectric indirect coupling simulation method for thin-wall capillary tube electric-assisted drawing forming Download PDFInfo
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Abstract
The invention belongs to the field of metal material forming and processing, and particularly relates to a thermoelectric force indirect coupling simulation method for thin-wall capillary electrically-assisted drawing forming. The invention can improve the calculation efficiency of the simulation of the electrically-assisted drawing process by utilizing the method of the static analysis collaborative simulation in the thermoelectric coupling and forming processes under the condition of not losing the simulation precision.
Description
Technical Field
The invention belongs to the field of metal material forming and processing, and particularly relates to a thermoelectric indirect coupling simulation method for thin-wall capillary electrically-assisted drawing forming.
Background
Due to the excellent heat exchange performance, pressure resistance and heat resistance, the capillary tube type heat exchanger has important application value for reducing the inlet airflow temperature of an aircraft engine and relieving the thermal environment of each working part of the engine. However, the outer diameter of the thin-wall capillary tube used in the capillary tube type heat exchanger is 0.9mm, the wall thickness is only 0.05mm, and the requirement on the uniformity of the wall thickness is less than 5 μm, which puts extremely high requirements on the drawing forming process of the thin-wall capillary tube. The manufacturing technology of thin-walled capillaries is mainly based on two traditional process methods: a combined process of multi-pass extrusion and drawing and a dieless hot drawing process. However, the capillary tube formed by the traditional drawing process has poor dimensional accuracy, uneven wall thickness and high qualification rate, and the forming efficiency is seriously influenced.
Electrically assisted forming processes have received a great deal of attention and have gained rapid growth in recent years. The current can effectively reduce the deformation resistance of the material, improve the plastic deformation capability of the material, improve the forming quality and regulate and control the microstructure of the material. At present, current is applied to processes such as embossing, rolling, wire drawing, rolling, and the like, and exhibits a good forming effect. However, few studies have been made on the electrically assisted drawing process of the thin-walled capillary, and particularly, the influence of different process parameters on the forming quality is not clear, so that a simulation combination experiment is required to promote the maturity and progress of the electrically assisted drawing process of the thin-walled capillary.
At present, the simulation of the thin-wall capillary electric auxiliary drawing forming process has a plurality of difficulties. On one hand, the modeling is difficult by adopting a direct thermoelectric coupling simulation method, the boundary conditions are set fussy, and the situation of non-convergence is easy to occur; on the other hand, the thermo-electric-structure grid unit adopted by the thermoelectric force direct coupling simulation method can only be used for three-dimensional components, so that the axisymmetric structure cannot be modeled and analyzed by using an axisymmetric model, and the calculation efficiency is greatly reduced. Therefore, a simulation method with high calculation efficiency and high prediction precision is needed to guide the optimization design of the thin-wall capillary electric-assisted drawing forming process.
The invention patent with publication number CN106807799A 'a superplastic zinc-aluminum alloy pipe drawing forming simulation method' provides a simulation optimization method for the traditional drawing forming process of the pipe, but because current is not introduced in simulation, the simulation method cannot be applied to thin-wall capillary electric auxiliary drawing forming simulation.
Disclosure of Invention
The invention provides a thermoelectric force indirect coupling simulation method for thin-wall capillary electric auxiliary drawing forming, which adopts finite element analysis software to establish a thermoelectric coupling model and a static force general model, wherein the thermoelectric coupling model is used for obtaining the temperature of a deformation zone of the thin-wall capillary in the electric auxiliary drawing process, and the static force general model is used for analyzing the material flow and the mechanical response behavior of the thin-wall capillary in the electric auxiliary drawing process. The reason why the invention is divided into two models is that the calculation efficiency of the simulation of the electrically-assisted drawing process can be improved by utilizing the thermoelectricity coupling and forming process statics analysis collaborative simulation method under the condition of not losing the simulation precision.
In order to achieve the purpose, the invention provides a thermoelectric force indirect coupling simulation method for thin-wall capillary electrically-assisted drawing forming, which comprises the following steps:
establishing a thermoelectric coupling model to obtain the average temperature of a deformation region in the electrically-assisted drawing process of the thin-wall capillary, and then obtaining the constitutive relation of material mechanics in the electrically-assisted drawing process of the thin-wall capillary by using the average temperature of the deformation region to further obtain a stress-strain curve of the electrically-assisted drawing process of the thin-wall capillary;
and establishing a static force general model based on the obtained stress-strain curve to obtain the material flow and mechanical response behaviors in the electrically-assisted drawing process of the thin-wall capillary.
Further, establishing a thermoelectric coupling model to obtain the average temperature of a deformation zone in the thin-wall capillary electrically-assisted drawing process, wherein the specific process comprises the following steps:
establishing a thermoelectric coupling model, wherein the specific process comprises the following steps:
1) setting absolute zero degree of a model physical constant and a Stefan-Boltzmann constant;
2) extracting geometric parameters of the thin-wall capillary tube electric auxiliary drawing device, and establishing an axisymmetric model of the drawing device;
3) setting material properties of the conductive material and the insulating material and giving the material properties to different parts of the drawing device;
4) assembling different parts, and establishing a thermoelectric coupling steady state analysis step;
5) defining the electric conduction between the positive and negative electrodes of the drawing device and the thin-wall capillary tube and the heat conduction between all the components of the drawing device, and setting the heat dissipation of different components in the environment;
6) defining a current density, a zero potential position and an ambient temperature at the load module;
7) designating a thermoelectric coupling unit for a conductive member, designating a heat transfer unit for an insulating member, and meshing all the members;
and carrying out simulation analysis based on the established thermoelectric coupling model to obtain the deformation zone temperature in the thin-wall capillary electrically-assisted drawing process and averaging to obtain the deformation zone average temperature.
Further, in step 3), the thermal conductivity, the electrical conductivity and the joule heat fraction are set for the conductive material, and the thermal conductivity is set for the insulating material.
Further, in the step 5), the heat dissipation of different parts in the environment comprises heat convection and heat radiation, the heat convection coefficient is set according to the air flow rate, and the emissivity of different materials is set.
Further, in step 7), mesh refinement is performed on the thin-wall capillary deformation region and the core part of the drawing die.
Further, a static force general model is established based on the obtained stress-strain curve to obtain material flow and mechanical response behaviors in the thin-wall capillary electrically-assisted drawing process, and the specific process is as follows:
establishing a static force general model, which comprises the following specific processes:
1) extracting geometric parameters of the thin-wall capillary tube electric auxiliary drawing device, and establishing an axisymmetric deformable model of the thin-wall capillary tube and an axisymmetric discrete rigid body model of a drawing die core;
2) obtaining the average temperature of a deformation area in the electrically-assisted drawing process of the thin-wall capillary according to the simulation result of the thermoelectric coupling model, obtaining the mechanical constitutive relation of the thin-wall capillary according to the average temperature of the deformation area, and setting the material property of the thin-wall capillary;
3) assembling the thin-wall capillary tube and the mold core, establishing a static force general analysis step, and starting geometric nonlinear setting;
4) setting a friction coefficient between the thin-wall capillary tube and the mold core, and establishing an interaction relation between the thin-wall capillary tube and the mold core;
5) setting drawing speed boundary conditions for the thin-wall capillary tube, and setting completely fixed boundary conditions for a die core reference point;
6) appointing an axisymmetric stress unit for the thin-wall capillary, and carrying out grid division on all parts of the drawing device;
and carrying out simulation analysis based on the established static force general model to obtain the material flow and mechanical response behaviors in the electrically-assisted drawing process of the thin-wall capillary.
Further, in the step 2), the mechanical constitutive relation of the thin-wall capillary is obtained through an interpolation method based on the electric auxiliary uniaxial tension experimental data under the average temperature of the deformation zone and different current densities.
Further, the method comprises the steps of: and comparing the obtained simulation result with the electric auxiliary drawing experiment result of the thin-wall capillary tube, and comparing the obtained simulation result with the operation result of the thermoelectric force direct coupling model, thereby verifying the effectiveness of the method.
The invention has the beneficial effects that:
1) according to the invention, a thermoelectric coupling simulation method for thin-wall capillary tube electric-assisted drawing forming thermoelectric force indirect coupling is formed by adopting a thermoelectric coupling model and a static force general model, and both models can be modeled and simulated by adopting a two-dimensional axisymmetric model, so that the improvement of the operation efficiency is facilitated;
2) according to the invention, redundant parts such as the positive and negative electrodes, the die holder and the drawing die except the die core can be deleted from the static force general model, so that the static analysis efficiency of the thin-wall capillary tube can be greatly improved on the premise of not influencing the temperature prediction precision of a deformation region;
3) the invention is beneficial to quickly and effectively carrying out optimized design of process parameters on the miniature parts with basically consistent temperature of the deformation zone and negligible influence of material thermal expansion in the electric auxiliary forming process, and saves time and cost.
Drawings
FIG. 1 is a flow chart of an embodiment of an indirect coupling simulation method of thin-walled capillary electrically-assisted drawing forming thermoelectric force;
FIG. 2 is a schematic diagram of a thermocouple die type of embodiment;
FIG. 3 is a cloud of the deformation zone temperature profile at a maximum temperature of 600 ℃ for a thin-walled capillary tube obtained using the thermocouple die type established in the examples;
FIG. 4 is a stress-strain curve of a thin-walled capillary plastic segment at an average temperature of 423 ℃ in a deformation region according to an embodiment;
FIG. 5 is a schematic diagram of a static force generic model of an embodiment;
FIG. 6 is a graph comparing simulation results with experimental results for the examples;
FIG. 7 is a schematic diagram of a thermoelectric direct coupling model of a comparative example;
FIG. 8 is a graph comparing process optimization times of examples and comparative examples;
FIG. 9 is a graph comparing simulation results of examples and comparative examples.
Detailed Description
The present invention is further described below with reference to the accompanying drawings, examples and comparative examples, it being understood that the examples and comparative examples described below are intended to facilitate the understanding of the present invention and are not intended to limit it in any way.
Examples
As shown in fig. 1, the simulation method for indirectly coupling the thin-walled capillary with the electric-assisted drawing forming thermoelectric force provided by this embodiment includes the following steps:
step 1: and extracting geometric parameters of the thin-wall capillary tube electric auxiliary drawing device, wherein the thin-wall capillary tube electric auxiliary drawing device comprises a positive electrode, a negative electrode, a thin-wall capillary tube, a drawing die and a die holder.
Step 2: and establishing a thermoelectric coupling model by adopting finite element analysis software Abaqus to obtain the average temperature of a deformation region in the electrically-assisted drawing process of the thin-wall capillary, and then obtaining a mechanical constitutive relation in the electrically-assisted drawing process of the thin-wall capillary by using the average temperature of the deformation region so as to obtain a stress-strain curve in the electrically-assisted drawing process of the thin-wall capillary. The method specifically comprises the following steps:
step 2-1: setting the absolute zero degree of the model physical constant to-273 ℃ and the Stefan-Boltzmann constant to 5.67 multiplied by 10 - 8 W/(m 2 ·K 4 )；
Step 2-2: establishing two-dimensional axisymmetric models of a positive electrode, a negative electrode, a thin-wall capillary tube, a drawing die and a die holder; in the embodiment, the selected thin-wall capillary tube has the outer diameter of 2.1mm, the wall thickness of 0.05mm and the length of 200mm, the outer diameter of the capillary tube is drawn to 1.94mm by adopting a single pass, the taper angle of a partial lubricating area of a die core part of a drawing die is 50 degrees, the taper angle of a reducing area is 12 degrees, the length of a sizing area is 1.5mm, the angle of the reducing area is 45 degrees, and the distances from a positive electrode to the upper end and the lower end of a die seat are both 30 mm;
step 2-3: setting thermal conductivity, electrical conductivity and joule heat share for the conductive material, setting thermal conductivity for the insulating material, and assigning material properties to different components of the drawing device; in the embodiment, the anode and cathode electrodes are made of pure copper, the thin-wall capillary material is GH4169, the mold core material is made of artificial polycrystalline diamond, and other materials of the mold and the mold base material are made of stainless steel 304;
step 2-4: assembling different parts, and establishing a thermoelectric coupling steady state analysis step; in the embodiment, the positions of all parts are relatively fixed during the electric auxiliary drawing of the thin-wall capillary, so that the steady-state temperature distribution of the drawing device can be quickly obtained by adopting a thermoelectric coupling steady-state analysis step;
step 2-5: defining the electric conduction of the positive and negative electrodes and the thin-walled capillary tube and the heat conduction among all components in the interaction attribute manager and the interaction manager, and setting the heat dissipation of different components in the environment; in the embodiment, natural convection heat transfer is adopted, and the convection heat transfer coefficient is set to be 10W/(m) 2 DEG C.); the emissivity of the thin-wall capillary tube is set to be 0.7W/(m) 2 ·K 4 ) The emissivity of other components is set to 0.2W/(m) 2 ·K 4 )；
Step 2-6: defining current density, boundary conditions and ambient temperature at the load module; in the embodiment, the current density is set under the conditions that the highest temperature of the capillary is guaranteed to be 600 ℃, the zero potential position is set as the outer surface of the negative electrode under the boundary condition, and the environment temperature is set to be 25 ℃;
step 2-7: assigning a thermoelectric coupling unit DCAX4E to the conductive member, assigning a heat transfer unit DCAX4 to the insulating member, meshing all the members, and particularly, performing mesh refinement processing on a thin-walled capillary deformation region and a core portion of a drawing die;
step 2-8: and establishing a thermoelectric coupling model based on the steps, and performing simulation analysis by using a thermoelectric coupling model as shown in FIG. 2 to obtain the temperature of the deformation region in the electric auxiliary drawing process of the thin-wall capillary and averaging to obtain the average temperature of the deformation region.
Fig. 3 is a cloud chart of the temperature distribution of the deformation region of the thin-walled capillary obtained by using the thermocouple mold type established in the present example, when the maximum temperature of the thin-walled capillary is 600 ℃. As can be seen from the figure, the deformation zone temperatures are substantially uniform, which indicates that a uniform mechanical constitutive relation can be adopted to represent the mechanical behavior of the deformation zone. In this example, the temperature of all nodes in the deformation zone was extracted to give an average temperature of 423 ℃.
Fig. 4 is a stress-strain curve of the plastic section of the thin-wall capillary when the average temperature of the deformation region is 423 ℃ in the embodiment, and since only the deformation region is subjected to plastic deformation and other regions are not subjected to deformation or are subjected to elastic deformation only in the drawing process of the thin-wall capillary, the plastic section constitutive response of the deformation region can be regarded as the integral plastic section constitutive response of the thin-wall capillary. In the embodiment, the plastic section constitutive response can be obtained by an interpolation method by utilizing the electric auxiliary uniaxial tension experimental data and the average temperature of the deformation area under different current densities.
And step 3: and establishing a static force general model by adopting finite element analysis software Abaqus based on the obtained stress-strain curve to obtain the material flow and mechanical response behaviors in the thin-wall capillary electrically-assisted drawing process. The method specifically comprises the following steps:
step 3-1: establishing a thin-wall capillary axis symmetric deformable model and a mold core part axis symmetric discrete rigid body model;
step 3-2: setting the material properties of the elastic section and the plastic section of the thin-wall capillary according to the obtained stress-strain curve in the electrically-assisted drawing process of the thin-wall capillary; in the embodiment, the plastic section material property is given to the thin-wall capillary in a form of directly inputting a stress-strain curve data point of the plastic section;
step 3-3: assembling the thin-wall capillary tube and the mold core, establishing a static force general analysis step, and starting geometric nonlinear setting;
step 3-4: setting the friction coefficient between the thin-wall capillary tube and the mold core; the friction coefficient was set to 0.05 in this example;
step 3-5: setting drawing speed boundary conditions for the thin-wall capillary tube, and setting completely fixed boundary conditions for a die core reference point; in the present embodiment, the drawing speed is set to 10 mm/min;
step 3-6: assigning an axisymmetric stress unit CAX4R to the thin-wall capillary, and meshing all the components;
step 3-7: establishing a static force general model based on the steps, and performing simulation analysis by using the established static force general model to obtain material flow and mechanical response behaviors in the thin-wall capillary electrically-assisted drawing process as shown in figure 5.
And 4, step 4: and comparing the obtained simulation result with the electric auxiliary drawing experiment result of the thin-wall capillary, and comparing the obtained simulation result with the operation result of the thermoelectric direct coupling model, thereby verifying the effectiveness of the simulation method of the embodiment.
The comparison graph of the simulation result of the embodiment and the result of the thin-wall capillary electric auxiliary drawing experiment is shown in fig. 6, and the result shows that the drawing force between the thin-wall capillary electric auxiliary drawing forming experiment and the simulation of the embodiment shows good consistency, and the average error is 21.2%, which confirms the effectiveness of the thermoelectric force indirect coupling simulation method provided by the invention.
Comparative example
The effectiveness of the simulation method of this embodiment is verified by using a direct thermoelectric coupling model (as shown in fig. 7), and the direct thermoelectric coupling model of this comparative example is substantially consistent with the process parameters used by the thermoelectric coupling model and the static force general model of the above embodiments, and includes the following steps:
step 1: setting the absolute zero degree-273 ℃ of the physical parameters of the model and the Stefan-Boltzmann constant of 5.67 multiplied by 10 -8 W/(m 2 ·K 4 )；
Step 2: establishing 1/4 three-dimensional models of a positive electrode, a negative electrode, a thin-wall capillary tube, a drawing die and a die holder; in the comparative example, the thermo-electric-structure grid cells adopted in the thermoelectric force direct coupling model cannot be endowed with a two-dimensional model, so that all parts in the thermoelectric force direct coupling model are three-dimensional models, and the sizes of the parts are consistent with those of the parts in the thermoelectric coupling model;
and step 3: setting various material attributes, wherein the conductive material is provided with density, elasticity, plasticity, thermal conductivity, electric conductivity and Joule heat share, and the insulating material is provided with density, elasticity and thermal conductivity, and endowing the material attributes to different parts; the material of the part is consistent with that of the part in the thermocouple mold clamping type; in the comparative example, a plastic module in the thin-wall capillary material attribute inputs electric auxiliary uniaxial tension experimental data under multiple groups of current densities, and Abaqus can automatically interpolate and solve the plastic section data according to the node temperature;
and 4, step 4: assembling different parts, and establishing two thermo-electric-structure coupling steady-state analysis steps; in the comparative example, the steady-state temperature distribution after current loading but when the thin-wall capillary is not drawn is obtained in the 1 st thermo-electric-structure coupling steady-state analysis step, and the mechanical response in the electrically-assisted drawing process of the thin-wall capillary is obtained in the 2 nd thermo-electric-structure coupling steady-state analysis step;
and 5: defining the electric conduction of the positive electrode, the negative electrode and the thin-wall capillary and the heat conduction among all components in the interaction attribute manager and the interaction manager, defining the friction coefficient between the thin-wall capillary and the mold core, and setting the heat dissipation of different components in the environment, wherein the heat dissipation setting is consistent with the thermoelectric coupling heat dissipation setting in the embodiment;
step 6: defining current density, boundary conditions and ambient temperature at the load module; in the comparative example, the current density was set under the conditions of ensuring the maximum temperature of the capillary to be 600 ℃, the drawing speed of the thin-walled capillary to be 10mm/min, the symmetric constraint boundary conditions for the thin-walled capillary, the completely fixed boundary conditions for the components other than the thin-walled capillary, the zero potential boundary conditions for the outer surface of the negative electrode, and the ambient temperature to be 25 ℃;
and 7: assigning a thermo-electric-structural unit Q3D8 to the conductive member, a temperature-displacement unit C3D8T to the insulating member, and meshing all the members, particularly, performing mesh refinement processing on the thin-walled capillary deformation region and the core portion of the drawing die;
and 8: and (4) establishing a thermoelectric force direct coupling model based on the steps 1-7, and carrying out simulation analysis to obtain a simulation result.
FIG. 8 is a graph comparing process optimization times of an example (using a thermoelectric force indirect coupling simulation method) and a comparative example (using a thermoelectric force direct coupling model). The result shows that the thermoelectric force indirect coupling simulation method provided by the invention only needs 9 minutes to complete one-time process parameter simulation, while the thermoelectric force direct coupling model only needs 340 minutes to complete one-time process parameter simulation. Therefore, the simulation method provided by the invention greatly improves the process parameter optimization efficiency.
FIG. 9 is a graph comparing simulation results of an example (simulation method using indirect coupling of thermoelectric force) and a comparative example (simulation model using direct coupling of thermoelectric force). As can be seen from the figure, the average temperature of the deformation region obtained by the method is 423 ℃, the drawing force is 43.7N, the average temperature of the deformation region obtained by the thermoelectric direct coupling model is 409 ℃, the drawing force is 41.3N, the average temperature error of the deformation region is 3.3%, and the drawing force error is 5.5%, which proves that the method can replace the thermoelectric direct coupling model to carry out process parameter optimization on the thin-wall capillary electrically-assisted drawing.
In conclusion, the invention can quickly and effectively optimize the electric auxiliary drawing process parameters of the thin-wall capillary and save the time cost.
It will be apparent to those skilled in the art that various modifications and improvements can be made to the embodiments of the present invention without departing from the inventive concept thereof, and these modifications and improvements are intended to be within the scope of the invention.
Claims (7)
1. A thermoelectric force indirect coupling simulation method for thin-wall capillary electrically-assisted drawing forming is characterized by comprising the following steps:
establishing a thermoelectric coupling model to obtain the average temperature of a deformation region in the thin-wall capillary electrically-assisted drawing process, and then obtaining the constitutive relation of material mechanics in the thin-wall capillary electrically-assisted drawing process by using the average temperature of the deformation region to further obtain a stress-strain curve of the thin-wall capillary electrically-assisted drawing process;
establishing a static force general model based on the obtained stress-strain curve to obtain material flow and mechanical response behaviors in the electrically-assisted drawing process of the thin-wall capillary;
the method comprises the following steps of establishing a thermoelectric coupling model to obtain the average temperature of a deformation zone in the process of electrically assisting drawing of the thin-wall capillary, wherein the specific process comprises the following steps:
establishing a thermoelectric coupling model, wherein the specific process comprises the following steps:
1) setting absolute zero degree of a model physical constant and a Stefan-Boltzmann constant;
2) extracting geometric parameters of the thin-wall capillary tube electric auxiliary drawing device, and establishing an axisymmetric model of the drawing device;
3) setting material properties of the conductive material and the insulating material and giving the material properties to different parts of the drawing device;
4) assembling different parts, and establishing a thermoelectric coupling steady state analysis step;
5) defining the electric conduction between the positive and negative electrodes of the drawing device and the thin-wall capillary tube and the heat conduction between all the components of the drawing device, and setting the heat dissipation of different components in the environment;
6) defining a current density, a zero potential position and an ambient temperature at the load module;
7) designating a thermoelectric coupling unit for a conductive member, designating a heat transfer unit for an insulating member, and meshing all the members;
and carrying out simulation analysis based on the established thermoelectric coupling model to obtain the deformation zone temperature in the electric auxiliary drawing process of the thin-wall capillary and averaging to obtain the deformation zone average temperature.
2. The method according to claim 1, characterized in that in step 3) the thermal conductivity, the electrical conductivity and the joule heat contribution are set for the electrically conductive material and the thermal conductivity is set for the insulating material.
3. The method of claim 1, wherein in step 5), the heat dissipation of the different components in the environment comprises thermal convection and thermal radiation, the convective heat transfer coefficient is set according to the air flow rate, and the emissivity of the different materials is set.
4. The method of claim 1, wherein in step 7), the thin-walled capillary deformation zone and the core portion of the drawing die are subjected to a mesh refining process.
5. The method according to claim 1, wherein a static force general model is established based on the obtained stress-strain curve to obtain material flow and mechanical response behaviors in the thin-wall capillary electrically-assisted drawing process, and the specific process is as follows:
establishing a static force general model, which comprises the following specific processes:
1) extracting geometric parameters of the thin-wall capillary tube electric auxiliary drawing device, and establishing an axisymmetric deformable model of the thin-wall capillary tube and an axisymmetric discrete rigid body model of a drawing die core;
2) obtaining the average temperature of a deformation region in the electrically-assisted drawing process of the thin-wall capillary according to the simulation result of the thermoelectric coupling model, obtaining the mechanical constitutive relation of the thin-wall capillary according to the average temperature of the deformation region, and setting the material attribute of the thin-wall capillary;
3) assembling the thin-wall capillary tube and the mold core, establishing a static force general analysis step, and starting geometric nonlinear setting;
4) setting a friction coefficient between the thin-wall capillary tube and the mold core, and establishing an interaction relation between the thin-wall capillary tube and the mold core;
5) setting drawing speed boundary conditions for the thin-wall capillary tube, and setting completely fixed boundary conditions for a die core reference point;
6) appointing an axisymmetric stress unit for the thin-wall capillary, and carrying out grid division on all parts of the drawing device;
and carrying out simulation analysis based on the established static force general model to obtain the material flow and mechanical response behaviors in the electrically-assisted drawing process of the thin-wall capillary.
6. The method as claimed in claim 5, wherein in the step 2), the mechanical constitutive relation of the thin-wall capillary is obtained by an interpolation method based on the average temperature of the deformation region and the electrically-assisted uniaxial tension experimental data under different current densities.
7. The method according to any one of claims 1 to 6, further comprising the steps of: and comparing the obtained simulation result with the electric auxiliary drawing experiment result of the thin-wall capillary, and comparing the obtained simulation result with the operation result of the thermoelectric direct coupling model to verify the effectiveness of the method.
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