Internal thread copper tube structure size optimization method, system, equipment and storage medium

Abstract

The present invention relates to the technical field of copper tube optimization, and in particular to a method, system, equipment and storage medium for optimizing the structural dimensions of an internally threaded copper tube. The method comprises: determining a transformation relationship fitting curve, a heat transfer coefficient variation law curve and a meter-gram weight variation law curve of an internally threaded tube, adjusting geometric parameters according to the above curves, and forming a parameter optimization scheme; according to the parameter optimization scheme, establishing a three-dimensional model corresponding to the internally threaded tube and performing quantitative solution calculations; according to the quantitative solution calculation results, when it is determined that the design requirements can be met, loading the three-dimensional model to form a corresponding forming mold; simulating a ball spinning process for the three-dimensional model and the forming mold and performing finite element analysis; adjusting the design parameters of the forming mold according to the analysis results until it is determined that the forming design requirements can be met; being able to simulate and optimize the structural dimensions of the internally threaded copper tube, and predicting the product performance of the optimization scheme, obtaining the best optimization scheme, and reducing the debugging requirements in actual production.

Description

Technical Field

[0001] The present invention relates to the technical field of copper tube optimization, and in particular to a method, system, equipment and storage medium for optimizing the structural dimensions of an internally threaded copper tube. Background Art

[0002] Internally threaded copper tube is a kind of pipe widely used in the air-conditioning and refrigeration industry. Its inner surface has a certain number of regularly arranged threads, which can increase the heat exchange area, improve the thermal conductivity of the refrigerant side, and thus effectively improve the heat exchange. It is widely used in the air-conditioning and refrigeration industry, evaporator heat exchange components and connecting pipes.

[0003] Meter weight is of great significance for the selection of internally threaded copper tubes, which can reduce the amount of material used and directly reduce the overall weight of the product. The basic parameters of internally threaded copper tubes have a significant impact on the heat exchange performance, such as outer diameter, bottom wall thickness, tooth height, helix angle, tooth top angle and number of teeth. In actual application, it is necessary to comprehensively consider the requirements of cost, performance and processing technology, and optimize the structural dimensions of the internally threaded copper tubes, so as to reduce the meter weight while ensuring that the energy efficiency of the internally threaded copper tubes is not reduced, so as to improve the competitive advantage of the product. In related technologies, the method of optimizing the basic parameters of internally threaded copper tubes by actual production equipment debugging not only requires additional raw materials and energy consumption, affecting production efficiency and output, but is also affected by equipment accuracy and manual operation, and it is difficult to ensure that the basic parameters of the optimized internally threaded copper tubes are the best solution.

[0004] The information disclosed in this background technology section is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art known to those skilled in the art. Summary of the invention

[0005] The technical problem to be solved by the present invention is: to provide a method, system, equipment and storage medium for optimizing the structural dimensions of an internally threaded copper tube, to simulate and optimize the structural dimensions of the internally threaded copper tube, and to predict the performance of the internally threaded copper tube of the optimization scheme, to obtain the best internally threaded copper tube parameter optimization scheme, and to reduce the debugging requirements in actual production.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is: a method for optimizing the structural size of an internally threaded copper tube, comprising the following steps:

[0007] Determine the mass flow rate range and the corresponding calculation model of the internally threaded pipe, and obtain a transformation relationship fitting curve corresponding to any mass flow rate value within the mass flow rate range according to the calculation model;

[0008] Determine the influence of heat transfer coefficient and meter weight on the correlation coefficient of internal threaded pipe teeth, and obtain the heat transfer coefficient change law curve and meter weight change law curve respectively;

[0009] According to the transformation relationship fitting curve, the heat transfer coefficient variation law curve and the meter-gram weight variation law curve, the relevant geometric parameters of the internally threaded pipe are adjusted to form a parameter optimization scheme for the internally threaded pipe;

[0010] According to the parameter optimization scheme, a three-dimensional model corresponding to the internally threaded pipe is established, and based on the three-dimensional model, the heat transfer coefficients of the bare pipe, the internally threaded pipe before optimization, and the internally threaded pipe after optimization at the same level are quantitatively solved and calculated to obtain the heat transfer change relationship of the pipe and the change relationship of the heat transfer coefficient of each type of pipe with the mass flow rate;

[0011] According to the quantitative solution calculation results, when it is analyzed and determined that the parameter optimization scheme of the internal threaded pipe can meet the design requirements, the internal threaded pipe three-dimensional model is loaded to form a corresponding forming die according to the parameter optimization scheme of the internal threaded pipe;

[0012] Simulating a ball spinning process on the three-dimensional model and the forming die, and performing finite element analysis;

[0013] The design parameters of the forming die are adjusted according to the finite element analysis results until it is determined that the forming die can meet the forming design requirements of the internal threaded pipe parameter optimization solution.

[0014] Furthermore, the method of determining the mass flow rate range of the internally threaded pipe and the corresponding calculation model, and obtaining the transformation relationship fitting curve corresponding to any mass flow rate value within the mass flow rate range according to the calculation model includes the following steps:

[0015] Determine the mass flow rate range and corresponding calculation model of the internal threaded pipe, and determine the critical values ​​of the transformation of several internal threaded pipes corresponding to the two mass flow rate endpoints according to the calculation model

[0016] Extraction of critical value of transformation of internal thread pipe Perform data fitting to obtain the transformation relationship fitting curves corresponding to the two mass flow rate endpoint values;

[0017] The transformation relationship fitting curves corresponding to the two mass flow rate endpoint values ​​are linearly interpolated to obtain the transformation relationship fitting curve corresponding to any mass flow rate value within the mass flow rate range.

[0018] Furthermore, when adjusting the relevant geometric parameters of the internal threaded pipe, it is necessary to comprehensively consider the reduction of meter weight, maintenance of heat transfer coefficient, pressure drop during the use of the pipe, the impact of subsequent secondary processing such as bending and expansion, and the difficulty of processing and manufacturing based on the transformation relationship fitting curve, the heat transfer coefficient change law curve and the meter weight change law curve.

[0019] Furthermore, the finite element analysis performed on the three-dimensional model includes spinning metal deformation analysis, die stress analysis, forming defect analysis, plastic strain analysis and metal flow analysis.

[0020] Furthermore, the spinning metal deformation analysis is to determine the position distribution and deformation amount of the deformation area of ​​the threaded copper tube tooth structure by finite element simulation of the stress distribution of the tube blank during the ball spinning process, and the deformation area includes the formed area, the deformation area and the area to be deformed.

[0021] Furthermore, the mold force analysis is to determine the radial load distribution change curve and the axial load distribution change curve of the forming mold by simulating the load change of the core head and the steel ball during the deformation process during the ball spinning process through finite element analysis.

[0022] Furthermore, the forming defect analysis is to determine the location and causes of surface defects on the internally threaded copper tube during the forming process by finite element simulation of the tube cross-section tooth forming process during the ball spinning process.

[0023] Furthermore, the plastic strain analysis is to simulate the strain distribution of the internal threaded copper tube during the ball spinning process by finite element method, and determine the stress distribution change process formed by the tooth structure of the internal threaded copper tube during the spinning of the forming mold.

[0024] Furthermore, the metal flow analysis is to determine the flow rate and direction of the metal in the tooth structure of the internal threaded copper tube by finite element simulation of the flow vector distribution of the metal during the ball spinning process, and to determine the folding area of ​​the inner surface of the internal threaded copper tube.

[0025] The present invention also provides a system for optimizing the structural dimensions of an internally threaded copper tube, comprising:

[0026] The parameter analysis module is used to determine the mass flow rate range of the internally threaded pipe and the corresponding calculation model, and obtain the transformation relationship fitting curve corresponding to any mass flow rate value within the mass flow rate range according to the calculation model; determine the influence of the heat transfer coefficient and the meter weight on the internally threaded pipe tooth correlation coefficient, and obtain the heat transfer coefficient change law curve and the meter weight change law curve respectively;

[0027] A scheme forming module, used to adjust the relevant geometric parameters of the internally threaded pipe according to the transformation relationship fitting curve, the heat transfer coefficient variation law curve and the meter-gram weight variation law curve, so as to form a parameter optimization scheme for the internally threaded pipe;

[0028] A model analysis module is used to establish a three-dimensional model corresponding to the internally threaded pipe according to the parameter optimization scheme, and based on the three-dimensional model, quantitatively solve and calculate the heat transfer coefficients of the bare pipe, the internally threaded pipe before optimization, and the internally threaded pipe after optimization at the same level, to obtain the heat transfer change relationship of the pipe and the change relationship of the heat transfer coefficient of each type of pipe with the mass flow rate;

[0029] The mold loading module is used to analyze and determine that the parameter optimization scheme of the internal threaded pipe can meet the design requirements based on the quantitative solution calculation results. According to the parameter optimization scheme of the internal threaded pipe, the internal threaded pipe three-dimensional model is loaded to form a corresponding forming mold;

[0030] A finite element analysis module, simulating a ball spinning process on the three-dimensional model and the forming die, and performing finite element analysis;

[0031] The mold optimization module adjusts the design parameters of the molding mold according to the finite element analysis results until it is determined that the molding mold can meet the molding design requirements of the internal thread pipe parameter optimization solution.

[0032] The present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of the internal threaded copper tube structural size optimization method as described above are implemented.

[0033] The present invention also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the internal threaded copper tube structure size optimization method as described above are implemented.

[0034] The beneficial effects of the present invention are as follows: the present invention reduces the need for equipment debugging in actual production by simulating and optimizing the structural dimensions of the internally threaded copper tube, optimizes the basic parameters of the internally threaded copper tube, can reduce the meter weight while ensuring that the energy efficiency is not reduced, reduces the amount of material used, and directly reduces the overall weight of the product, thereby reducing the material cost; the performance of the internally threaded copper tube of the optimization scheme can be predicted, reducing the trial and error cost, and through finite element analysis and simulated ball spinning process, the mold structure parameters can be adjusted in advance before actual production to ensure the design quality of the molding mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 It is a schematic flow chart of a method for optimizing the structural dimensions of an internally threaded copper tube according to an embodiment of the present invention;

[0037] Figure 2 In the embodiment of the present invention, J G -X tt Relational data and extraction diagram;

[0038] Figure 3 The mass flow rate value G in the embodiment of the present invention is 200 kg / (m 2 ·s) condition J G Schematic diagram of the fitting curve of the experimental values;

[0039] Figure 4 The mass flow rate value G in the embodiment of the present invention is 400 kg / (m 2 ·s) condition J G Schematic diagram of the fitting curve of the experimental values;

[0040] Figure 5 A schematic diagram of a curve showing the influence of tooth-related parameters on the heat transfer coefficient in an embodiment of the present invention;

[0041] Figure 6 A schematic diagram of a curve showing the influence of tooth-related parameters on meter weight in an embodiment of the present invention;

[0042] Figure 7 Schematic diagram of strain distribution of a tube blank in the spinning metal deformation analysis in an embodiment of the present invention;

[0043] Figure 8 Schematic diagram of the contact area between the inner surface teeth of the copper tube and the core head in the spinning metal deformation analysis in an embodiment of the present invention;

[0044] Fig. 9 Schematic diagram of the metal flow velocity field distribution in the tube cross section in the spinning metal deformation analysis in the embodiment of the present invention;

[0045] Fig.10 A schematic diagram of tool load curve variation during the spinning process in the die force analysis in an embodiment of the present invention;

[0046] Fig.11 It is a cross-sectional view of the spinning process in the forming defect analysis in the embodiment of the present invention;

[0047] Fig.12 is the inner surface folding defect simulated in the forming defect analysis in the embodiment of the present invention;

[0048] Fig.13 A diagram showing the folding of a cross section during a spinning process in a forming defect analysis in an embodiment of the present invention;

[0049] Fig.14It is a schematic diagram of the handover situation after the whole is restored in the forming defect analysis in the embodiment of the present invention;

[0050] Fig.15 Schematic diagram of strain distribution of two-dimensional ball spinning simulation in plastic strain analysis in an embodiment of the present invention;

[0051] Fig.16 It is a metal flow vector diagram of a two-dimensional rolling spinning process in the metal flow analysis in an embodiment of the present invention;

[0052] Fig.17 Schematic diagram of the structure of the internal thread copper tube structure size optimization system in an embodiment of the present invention. DETAILED DESCRIPTION

[0053] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0054] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0056] like Figures 1 to 6 The method for optimizing the structural dimensions of an internally threaded copper tube shown comprises the following steps:

[0057] Determine the mass flow rate range and the corresponding calculation model of the internally threaded pipe, and obtain the transformation relationship fitting curve corresponding to any mass flow rate value within the mass flow rate range according to the calculation model;

[0058] Determine the influence of heat transfer coefficient and meter weight on the correlation coefficient of internal threaded pipe teeth, and obtain the heat transfer coefficient change law curve and meter weight change law curve respectively;

[0059] According to the transformation relationship fitting curve, the heat transfer coefficient change law curve and the meter-gram weight change law curve, the relevant geometric parameters of the internal threaded pipe are adjusted to form a parameter optimization plan for the internal threaded pipe;

[0060] According to the parameter optimization plan, a three-dimensional model corresponding to the internal threaded pipe is established. Based on the three-dimensional model, the heat transfer coefficients of the bare pipe, the internal threaded pipe before optimization, and the internal threaded pipe after optimization at the same level are quantitatively solved and calculated to obtain the heat transfer change relationship of the pipe and the change relationship of the heat transfer coefficient of each type of pipe with the mass flow rate.

[0061] According to the quantitative solution calculation results, when it is analyzed and determined that the parameter optimization scheme of the internal threaded pipe can meet the design requirements, the internal threaded pipe three-dimensional model is loaded to form a corresponding forming die according to the parameter optimization scheme of the internal threaded pipe;

[0062] Simulate the ball spinning process and perform finite element analysis on the 3D model and forming die;

[0063] The design parameters of the forming die are adjusted according to the finite element analysis results until it is determined that the forming die can meet the forming design requirements of the internal thread pipe parameter optimization solution.

[0064] The present invention reduces the need for equipment debugging in actual production by simulating and optimizing the structural dimensions of the internally threaded copper tube, and optimizes the basic parameters of the internally threaded copper tube. This can reduce the meter weight while ensuring that the energy efficiency is not reduced, reduce the amount of material used, and directly reduce the overall weight of the product, thereby reducing the material cost; the performance of the internally threaded copper tube of the optimization scheme can be predicted, reducing the cost of trial and error, and through finite element analysis and simulated ball spinning process, the mold structure parameters can be adjusted in advance before actual production to ensure the design quality of the molding mold.

[0065] Through the above-mentioned digital simulation method, the tooth structure and size of the internal threaded pipe can be optimized to form a product that is highly compatible with customer requirements. In addition, while ensuring the reasonable matching of tooth parameter changes and no reduction in energy efficiency, the weight per meter of the internal threaded copper pipe can be significantly reduced, thereby effectively reducing the usage of copper pipes per machine and reducing the processing and manufacturing costs of customer products, thus having a greater competitive advantage.

[0066] On the basis of the above-mentioned embodiment, determining the mass flow rate range of the internally threaded pipe and the corresponding calculation model, and obtaining the transformation relationship fitting curve corresponding to any mass flow rate value within the mass flow rate range according to the calculation model includes the following steps:

[0067] Determine the mass flow rate range and corresponding calculation model of the internal threaded pipe, and determine the critical values ​​of the transformation of several internal threaded pipes corresponding to the two mass flow rate endpoints according to the calculation model

[0068] Extraction of critical value of transformation of internal thread pipe Perform data fitting to obtain the transformation relationship fitting curves corresponding to the two mass flow rate endpoint values;

[0069] The transformation relationship fitting curves corresponding to the two mass flow rate endpoint values ​​are linearly interpolated to obtain the transformation relationship fitting curve corresponding to any mass flow rate value within the mass flow rate range.

[0070] First, it is necessary to determine the minimum and maximum mass flow rates that the internally threaded pipe may encounter in actual applications; this range is determined based on customer needs, such as the design parameters of the air conditioning and refrigeration system, operating conditions, and the physical properties of the internally threaded pipe. In this embodiment, the mass flow rate range can be selected to be 200-400 kg / (m 2 ·s); According to the relevant dimension data of the internally threaded copper tube product to be optimized, the corresponding calculation model can be determined. For example, in this embodiment, the tooth height to diameter ratio of the internally threaded tube product is about 0.02, which meets the condition of being less than 0.04 and is suitable for the calculation condition of the Cavallini model. Therefore, the Cavallini model can be selected as the calculation model corresponding to the internally threaded tube. G The dimensionless gas velocity is obtained by considering the wavy-to-annular transition between the smooth tube and the threaded tube. The critical value of the transition is expressed as It can be calculated by the following formula:

[0071]

[0072] Among them, X tt The expression is:

[0073] X tt =(μ L / μ G ) 0.1 (ρ G / ρ L ) 0.5 [(1-x) / x] 0.9

[0074] Among them, ρ L and ρ G Respectively represent the density of liquid and gaseous media, unit: kg / m 3 ;μ L and μ G They represent the dynamic viscosity of liquid and gaseous media respectively, unit: kg / (m·s); x represents the thermal steam mass.

[0075] For J G The corresponding data were extracted and curve fitting was performed to determine J G -X ttThe relationship diagram was drawn and data was extracted to obtain the J under the conditions of G = 200 kg / (m2·s) and G = 400 kg / (m2·s). G The result data, relationship data and extraction results are as follows Figure 2 shown.

[0076] By fitting and analyzing the extracted data, it is found that J G The change satisfies the power function trend. By fitting the extracted result data, we get G = 200 kg / (m 2 ·s) and G = 400kg / (m 2 ·s) condition J G The fitting curve of the experimental value is as follows Figure 3 As shown, for J under other G values G Data can be obtained by using linear interpolation method between the transformation relationship fitting curves corresponding to the two endpoint values ​​to generate the corresponding transformation relationship fitting curve for any mass flow rate value within the mass flow rate range; that is, the transformation relationship fitting curve of 200-400 kg / (m 2 ·s) range, any value J G data.

[0077] On the basis of the above embodiments, in the process of obtaining the heat transfer coefficient variation curve and the meter weight variation curve, the fixed heat transfer coefficient automatic calculation program and the meter weight automatic calculation program can be used to calculate the influence of relevant parameters on the heat transfer coefficient and meter weight of the internal threaded pipe respectively, and automatically generate the corresponding variation curve.

[0078] The heat transfer coefficient variation curve shows that the heat transfer coefficient of the internal threaded pipe increases linearly with the increase of the number of thread teeth and the thread tooth height. The rate of increase of the heat transfer coefficient gradually increases with the increase of the helix angle, and the heat transfer coefficient decreases with the increase of the tooth top angle. For details, refer to Figure 5 (a) and 5(c), with the increase of thread teeth number and thread tooth height, the heat transfer coefficient of the pipe also shows an increasing trend as a whole, among which the increase of thread teeth number and thread tooth height has a linear effect on the heat transfer coefficient as a whole; refer to Figure 5 (b) As the helix angle increases, the rate of increase of the heat transfer coefficient gradually increases, that is, it shows an overall nonlinear increase trend, indicating that increasing the helix angle can effectively improve the heat transfer performance of the pipe; in addition, referring to Figure 5 (d) As the tooth top angle increases, the heat transfer performance of the pipe shows a linear downward trend as a whole, and the overall decline is relatively small. Therefore, from the perspective of increasing the heat transfer coefficient, the tooth top angle should be controlled as small as possible.

[0079] The curve of the change law of meter weight shows that the meter weight of internal threaded pipe increases linearly with the increase of thread teeth number, and increases nonlinearly with the increase of tooth height and tooth top angle, and the meter weight does not change with the increase of helix angle; for details, refer to Figure 6 (a), 6(c) and 6(d), the weight increases with the increase of the number of thread teeth, tooth height and tooth top angle of the pipe. Among them, the increase of the number of thread teeth on the weight shows a linear trend. This is mainly because the number of thread teeth mainly increases the cross-sectional area of ​​the pipe. The increase of the cross-sectional area shows a linear change, so the effect on heat transfer also shows a linear trend. The increase of tooth height and tooth top angle on the weight has a slight nonlinear characteristic, but it is not obvious. In addition, referring to Figure 6 (b), The helix angle has no effect on the Mickel weight.

[0080] On the basis of the above embodiments, according to the analysis of the transformation relationship fitting curve, the heat transfer coefficient change law curve and the meter weight change law curve, it is determined that increasing the tooth height, increasing the helix angle and the number of teeth will increase the heat transfer coefficient in the tube, but the pressure drop will also increase accordingly, while reducing the tooth top angle will improve the overall heat transfer performance and reduce the pressure loss. According to the above analysis results, the relevant geometric parameters of the internal threaded pipe can be adjusted multiple times to form a parameter optimization plan for the internal threaded pipe.

[0081] When adjusting the relevant geometric parameters of the internally threaded pipe, it is necessary to comprehensively consider the reduction of meter weight, maintenance of heat transfer coefficient, pressure drop during the use of the pipe, the influence of subsequent secondary processing such as bending and expansion, and the difficulty of processing and manufacturing based on the transformation relationship fitting curve, the heat transfer coefficient change law curve and the meter weight change law curve; to ensure that the relationship between the tooth correlation coefficient, meter weight and heat transfer coefficient can be balanced, and to ensure that the pipe can still meet the performance requirements such as strength and heat transfer efficiency in the subsequent processing.

[0082] It should be noted that after determining the parameter optimization scheme, it is necessary to determine whether the internal threaded pipe corresponding to the parameter optimization scheme can meet the design requirements. At this time, a three-dimensional model corresponding to the internal threaded pipe can be established according to the parameter optimization scheme, and based on the three-dimensional model, the heat transfer coefficients of the bare pipe, the internal threaded pipe before optimization, and the internal threaded pipe after optimization at the same level are quantitatively solved and calculated to obtain the heat transfer change relationship of the pipe and the change relationship of the heat transfer coefficient of each type of pipe with the mass flow rate. According to the quantitative solution calculation results, the heat dissipation performance improvement rate, heat exchange area, weight reduction, etc. of the existing internal threaded pipe and the internal threaded pipe corresponding to the parameter optimization scheme compared with the bare pipe are analyzed and determined, so that it can be determined that the internal threaded pipe corresponding to the parameter optimization scheme can meet the weight reduction requirements while ensuring the heat exchange area and heat dissipation performance, and at each mass flow rate, the increase in heat transfer coefficient is kept in a stable range, verifying that the parameter optimization scheme of the internal threaded pipe meets the design requirements.

[0083] When the parameter optimization scheme of the internal threaded pipe can meet the design requirements, according to the parameter optimization scheme of the internal threaded pipe, based on the parameters obtained from the pipe blank test at different stages of the production process, the three-dimensional model of the internal threaded pipe is loaded to automatically form the corresponding forming mold, so as to facilitate the subsequent simulation of the specific conditions of the actual processing process.

[0084] On the basis of the above-mentioned embodiment, the finite element analysis performed on the three-dimensional model includes spinning metal deformation analysis, die stress analysis, forming defect analysis, plastic strain analysis and metal flow analysis.

[0085] Spinning metal deformation analysis can simulate the deformation behavior of metal during the spinning process, which helps to optimize the spinning process parameters, ensure uniform metal flow, and improve product quality; mold force analysis can simulate the complex forces that the mold will be subjected to during the spinning process. Through finite element analysis, the stress and strain distribution of the mold under different working conditions can be evaluated, so that the structure and parameters of the mold can be adjusted to ensure that the mold is more durable and reliable; forming defect analysis can predict the defects that may occur in the forming process, such as shrinkage, cracks, folding, etc., and the process can be adjusted before actual production to reduce or eliminate defects that may affect product quality; plastic strain analysis can determine the deformation behavior of the material during the forming process, so as to ensure that the load strength of the mold and the formed product meets the requirements; metal flow analysis can simulate the flow path and speed of the material during the forming process, which helps to optimize the forming process and ensure that the material can fill the mold evenly while avoiding excessive thinning or folding.

[0086] Based on the above embodiments, the spinning metal deformation analysis is to simulate the stress distribution of the tube blank during the ball spinning process through finite element simulation to determine the position distribution and deformation amount of the deformation area of ​​the threaded copper tube tooth structure. The deformation area includes the formed area, the deformation area and the area to be deformed.

[0087] Finite element simulation can reflect the stress distribution of the tube blank during ball spinning, distinguish the formed area, deformation area and area to be deformed, so as to provide a basis for process optimization, help optimize the spinning process and ensure the uniform deformation of the tube and the high quality of the final product; in this embodiment, when performing the spinning metal deformation analysis, refer to Figure 7 , there is a part of the tooth formed by the previous steel ball spinning in front of the spinning deformation zone, which can explain that the ball spinning internal thread tooth forming is a local multi-pass forming process. During the spinning process, the deformation zone is mainly subjected to three-dimensional compressive stress, but the strain state is more complicated. Figure 7 (a) is the radial strain distribution of the tube blank during spinning. It can be seen that radial tensile deformation occurs on the thread teeth, and radial compression deformation mainly occurs on the tooth bottom wall. This periodic distribution of local tension and local compression shows the law of radial metal complementary flow. Figure 7(b) is the simulation result of tangential strain distribution of tube blank. Figure 7 (c) is the axial strain distribution of the tube blank. The main axial tensile deformation occurs, and the deformation of the tooth and the tooth bottom wall is very small, which is slightly larger than the bottom wall.

[0088] The deformation process of the internal thread copper tube is a multi-pass spinning tooth deformation process of multiple steel balls, such as Figure 8 It can be seen from the contact diagram shown that the tooth formed in front of the spinning deformation zone is a half tooth. In the deformation zone, the non-extrusion side of the half tooth is in contact with the core head, and the tooth top is tilted upward toward the extrusion side. The complete tooth is in contact with both sides of the core head tooth groove, so the surface quality of the tooth shape is better.

[0089] In order to better analyze the metal flow law of spinning teeth, the flow velocity distribution of the metal in the tube section can be studied by simulation, such as Fig. 9 As shown in the figure, it can be clearly seen from the cross section of the tube that the tube blank can be roughly divided into the formed area, the deformation area and the area to be deformed according to the deformation mode. The tooth shape in the formed area has been basically filled, the deformation area is in the tooth filling stage, and the area to be deformed has part of the tooth shape formed by the previous steel ball spinning process; Fig. 9 From the velocity distribution of metal flow in the deformation zone, it can be found that the metal flow is fastest in the center line of the threaded tooth, and the metal flow velocity gradually decreases from the center line of the tooth to both sides. The overall metal flow is in a bell-mouth shape, which makes the metal flow velocity at the tooth top faster than that at the tooth side, making it easier to fill the groove.

[0090] Based on the above embodiments, the mold force analysis is to simulate the load changes of the core head and the steel ball during the deformation process during the ball spinning process through finite element simulation, and determine the radial load distribution change curve and the axial load distribution change curve of the molding mold.

[0091] The mold will be subjected to complex forces during the spinning process; through finite element analysis, the load changes of the mold under different working conditions can be evaluated, which helps to identify possible weaknesses of the mold and areas that need to be strengthened, thereby ensuring the life of the mold and the reliability of its use.

[0092] like Fig.10 As shown, the loads on the core head and the steel ball during the deformation process can be calculated through finite element simulation; Fig.10 The radial load (a) is the resultant force of the load on the cross section of the tube. Fig.10(b) The axial load is the load component on the axis of the tube blank; it can be seen that steel ball 1 and steel ball 2 have the same load at the same time, that is, the two steel balls are spun to the rotational symmetry plane of the tube blank respectively; from the bite of the steel ball to the stability, the load of the steel ball and the core head gradually increases. In the steady state, the radial load of the steel ball and the core head is between 400N and 700N, while the maximum axial load is less than 70N, which is one tenth of the radial load. This shows that the deformation of the tube blank is mainly the metal flow redistribution process of the cross section, while the axial tensile deformation is very small; the large fluctuation of the mold load is caused by the uneven deformation caused by the periodic distribution of the internal thread teeth. Due to the stress state of the steel ball, the spin ring is seriously worn in actual production and is a wearing part, while the end cover is less worn and is a durable part. Therefore, in order to improve the life of the overall mold and reduce costs, it is possible to consider improving the wearing parts such as the spin ring and steel balls.

[0093] On the basis of the above-mentioned embodiment, the forming defect analysis is to simulate the tube cross-section tooth forming process during the ball spinning process by finite element method, and determine the position and formation cause of the surface defects of the internal threaded copper tube during the forming process.

[0094] Different process parameters in the ball spinning process, such as thinning rate, feed ratio, ball diameter, spindle speed, etc., have a certain influence on the spinning effect, which will cause uneven metal flow and thus lead to the formation of defects, including bulges, corrugations, expansion, cracks, etc. Through simulation, the formation conditions of these defects can be predicted and their causes can be analyzed, so that the formation of defects in the actual production process can be avoided by optimizing process parameters, improving mold design and other preventive measures.

[0095] Specifically, Fig.11 The finite element simulation of the tube cross-section tooth forming process shows that there is a gap between the tube blank bulge and the inner surface of the core head before the steel ball spinning. Fig.12 The folding defect shown; Fig.13 It can be seen that there is no folding directly below the spinning steel ball, but periodic folding marks appear before and after it. Fig.13 The cross section clearly shows the folding distribution of the tooth side; folding is the most common defect on the inner surface of the copper tube during the ball spinning process of the internal thread copper tube. It also shows that reducing the gap between the inner surface of the original tube blank and the thread core head is conducive to improving the folding problem; Fig.14 To simulate the symmetry of the interface after the one-sixth tube blank is restored to simplify the process, it can be seen that the contact surface and the axis of the tube blank are inclined at a certain angle. If there is a crack defect on the outer surface of the original tube blank, a jagged crack line will appear on the outer surface after multiple steel ball spinning.

[0096] Based on the above embodiments, the plastic strain analysis is to simulate the strain distribution of the internal threaded copper tube during the ball spinning process by finite element method, and determine the stress distribution change process formed by the tooth structure of the internal threaded copper tube during the spinning of the forming mold.

[0097] Plastic strain analysis simulates the strain distribution of the internally threaded copper tube under the spinning action of the forming die. It can determine the stress distribution change process of the internally threaded copper tube tooth structure, as well as the stress-strain state of the material at different stages as the spinning process proceeds. The simulation results can show stress concentration areas, which may lead to premature failure of the material or the formation of defects in actual production, thereby predicting the time when the process parameters may need to be adjusted during the spinning process to avoid excessive deformation or material damage, so as to ensure the rationality of the mold design parameters and the applicability of the process parameters, and improve the service life and molding quality of the mold.

[0098] Specifically, Fig.15 (a) is the simulation of the strain distribution of the first steel ball spinning at 600 steps. It can be seen from the figure that the total equivalent plastic strain at the top fillet of the tooth groove of the thread core head is the largest, and the strain at the top fillet of the tooth groove on the upper side is greater than that on the other side, while the deformation of the copper tube tooth body is very small, and the middle position is almost not deformed. Only a part of the tooth is formed during the first steel ball spinning; Fig.15 (b)-(d) are the strain distributions of the spinning process of the second steel ball simulated from 800 to 1000 steps; Fig.15 (b) When the second steel ball is spun, a bulge appears between the two steel balls. The second steel ball is spun on the basis of the first steel ball with some teeth formed. This bulge causes the second steel ball to appear when spun. Fig.15 (b) The tooth bottom clearance and tooth side clearance shown; when the second steel ball is spun, the root metal of the partial tooth formed in the front fills the tooth bottom clearance; Fig.15 As shown in (c), the metal at the bottom of the tooth on the upper side of the root also fills into the gap at the bottom of the tooth. At this time, if the outer surface of the thread core is smooth, the metal at the root of the tooth flows faster along the core surface, and the root fillet of the previously formed part of the tooth bends under the action of compressive stress, and finally it is easy to produce folding defects at the bottom wall of the tooth. The existence of the tooth side gap makes the metal at the bottom wall of the tooth close to the notch of the thread core flow into the groove. Fig.15 (b) At the same time, most of the metal flows into the groove along the flow path during the first forming process. At this time, the root fillet of the part of the tooth formed by the first spinning process is bent under the action of compressive stress. As the spinning process continues, Fig.15 (c) and Fig.15 (d) Folding of the tooth side shown.

[0099] Based on the above embodiments, the metal flow analysis is to simulate the flow vector distribution of the metal during the ball spinning process through finite element method, determine the flow rate and direction of the metal in the tooth structure of the internal threaded copper tube, and determine the folding area on the inner surface of the internal threaded copper tube.

[0100] Metal flow analysis simulates the flow vector distribution of metal during the spinning process, which helps to confirm the behavior and deformation characteristics of the material during the forming process. According to the simulation results, it can be used to predict the metal flow trend and possible uneven deformation areas, optimize the spinning process parameters, such as spinning pressure, spinning speed, etc., to reduce the generation of defects, and predict the location of the folding area, so as to avoid or reduce the above possible defects in actual production and improve product quality and production efficiency.

[0101] Specifically, Fig.16 The flow vector distribution of metal in the spinning process simulated by finite element method. Fig.16 (a) is the distribution of metal flow during the first steel ball spinning. It can be seen that the metal flow on the upper tooth side is parallel to the groove wall of the core head, while the lower side is at a certain angle to the groove wall. Fig.16 (b) and (c), when the second steel ball is spinning, two metal flows 1 and 2 are formed at a certain angle to fill the groove with the root of the half tooth formed by the first steel ball spinning as the boundary, and the metal flow direction 1 has a higher speed than the flow direction 2. The flow direction 1 gradually becomes parallel to the tooth groove wall on the core head, while the flow direction 2 gradually becomes parallel to the groove wall below the core head. Since the flow speeds and directions of the two are different, they collide on the lower tooth side, thereby inhibiting the flow of metal at the fillet of the root of the lower side of the half tooth formed by the first steel ball spinning, and finally forming a fold on the lower tooth side; similarly, at the tooth bottom position, with the fillet of the root of the half tooth formed by the first steel ball spinning as the boundary, two metal flows 3 and 4 with different flow rates appear. At the beginning, Fig.16 In (b), the velocity of flow direction 3 is greater than that of flow direction 4. At this time, the metal along flow direction 3 will accumulate on the lower side of the metal along flow direction 4, thus forming a fold at the bottom of the tooth; therefore, refer to Fig.16 (c) and (d), if the metal flow velocity in direction 1 is greater than that in direction 2, the tooth side folding can be eliminated. If the metal flow velocity in direction 3 is less than that in direction 4, the tooth bottom folding will not occur.

[0102] According to the above analysis, the folding of the inner surface of the internally threaded copper tube in this embodiment mainly occurs at the bottom of the tooth and the side of the tooth, that is, the folding of the side of the tooth only occurs as shown in FIG. Fig.16The lower side of the middle tooth, while the folding of the tooth bottom appears at the fillet of the tooth root on the upper side of the figure; by reducing the surface roughness of the tooth groove wall of the thread core head and increasing the speed of metal flow 1, it is beneficial to suppress the occurrence of tooth side folding, and appropriately increasing the roughness of the outer surface of the thread core head can increase the shear friction of the core head on the copper tube tooth bottom metal, thereby reducing the speed of metal flow 3 and improving the tooth bottom folding problem. Therefore, the design parameters of the forming mold can be adjusted according to the above finite element analysis results until it is determined that the forming mold can meet the forming design requirements of the internal thread pipe parameter optimization scheme, and the final forming mold optimization design scheme is obtained.

[0103] like Fig.17 As shown, the present invention also provides a system for optimizing the structural dimensions of an internally threaded copper tube, comprising:

[0104] The parameter analysis module is used to determine the mass flow rate range and the corresponding calculation model of the internally threaded pipe, and obtain the transformation relationship fitting curve corresponding to any mass flow rate value within the mass flow rate range according to the calculation model; determine the influence of the heat transfer coefficient and the meter weight on the internally threaded pipe tooth correlation coefficient, and obtain the heat transfer coefficient change law curve and the meter weight change law curve respectively;

[0105] A scheme forming module is used to adjust the relevant geometric parameters of the internal threaded pipe according to the transformation relationship fitting curve, the heat transfer coefficient change law curve and the meter-gram weight change law curve to form a parameter optimization scheme for the internal threaded pipe;

[0106] The model analysis module is used to establish a three-dimensional model corresponding to the internally threaded pipe according to the parameter optimization plan, and based on the three-dimensional model, quantitatively solve and calculate the heat transfer coefficient of the bare pipe, the internally threaded pipe before optimization, and the internally threaded pipe after optimization at the same level, and obtain the heat transfer change relationship of the pipe and the change relationship of the heat transfer coefficient of each type of pipe with the mass flow rate;

[0107] The mold loading module is used to analyze and determine that the parameter optimization scheme of the internal threaded pipe can meet the design requirements based on the quantitative solution calculation results. According to the parameter optimization scheme of the internal threaded pipe, the internal threaded pipe three-dimensional model is loaded to form a corresponding forming mold;

[0108] Finite element analysis module, which simulates the ball spinning process and performs finite element analysis on the 3D model and forming mold;

[0109] The mold optimization module adjusts the design parameters of the forming mold according to the finite element analysis results until it is determined that the forming mold can meet the forming design requirements of the internal thread pipe parameter optimization solution.

[0110] The present invention reduces the need for equipment debugging in actual production by simulating and optimizing the structural dimensions of the internally threaded copper tube, and optimizes the basic parameters of the internally threaded copper tube. This can reduce the meter weight while ensuring that the energy efficiency is not reduced, reduce the amount of material used, and directly reduce the overall weight of the product, thereby reducing the material cost; the performance of the internally threaded copper tube of the optimization scheme can be predicted, reducing the cost of trial and error, and through finite element analysis and simulated ball spinning process, the mold structure parameters can be adjusted in advance before actual production to ensure the design quality of the molding mold.

[0111] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the steps of the internal threaded copper tube structural size optimization method as described above are implemented, including determining the mass flow rate range of the internal threaded pipe and the corresponding calculation model, and obtaining a transformation relationship fitting curve corresponding to any mass flow rate value within the mass flow rate range according to the calculation model; determining the influence of the heat transfer coefficient and the meter-gram weight on the tooth correlation coefficient of the internal threaded pipe, and obtaining a heat transfer coefficient variation law curve and a meter-gram weight variation law curve respectively; adjusting the relevant geometric parameters of the internal threaded pipe according to the transformation relationship fitting curve, the heat transfer coefficient variation law curve, and the meter-gram weight variation law curve to form a parameter optimization scheme for the internal threaded pipe; and optimizing the parameters according to the parameter optimization. A three-dimensional model corresponding to the internally threaded pipe is established, and based on the three-dimensional model, the heat transfer coefficients of the bare pipe, the internally threaded pipe before optimization, and the internally threaded pipe after optimization at the same level are quantitatively solved and calculated, and the heat transfer change relationship of the pipe and the change relationship of the heat transfer coefficient of each type of pipe with the mass flow rate are obtained; according to the quantitative solution and calculation results, when it is analyzed and determined that the parameter optimization scheme of the internally threaded pipe can meet the design requirements, the three-dimensional model of the internally threaded pipe is loaded to form a corresponding forming mold according to the parameter optimization scheme of the internally threaded pipe; the ball spinning process is simulated for the three-dimensional model and the forming mold, and a finite element analysis is performed; the design parameters of the forming mold are adjusted according to the finite element analysis results until it is determined that the forming mold can meet the forming design requirements of the parameter optimization scheme of the internally threaded pipe.

[0112] The present invention also provides a computer-readable storage medium, which can be sold or used as an independent product. The storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the above-mentioned method for optimizing the structural size of an internally threaded copper tube are implemented, including determining the mass flow rate range of the internally threaded tube and the corresponding calculation model, and obtaining a transformation relationship fitting curve corresponding to any mass flow rate value within the mass flow rate range according to the calculation model; determining the influence of the heat transfer coefficient and the meter-gram weight on the tooth correlation coefficient of the internally threaded tube, and respectively obtaining a heat transfer coefficient variation law curve and a meter-gram weight variation law curve; adjusting the relevant geometric parameters of the internally threaded tube according to the transformation relationship fitting curve, the heat transfer coefficient variation law curve and the meter-gram weight variation law curve to form a parameter optimization scheme for the internally threaded tube; and According to the parameter optimization plan, a three-dimensional model corresponding to the internal threaded pipe is established, and based on the three-dimensional model, the heat transfer coefficients of the bare pipe, the internal threaded pipe before optimization, and the internal threaded pipe after optimization at the same level are quantitatively solved and calculated to obtain the heat transfer change relationship of the pipe and the change relationship of the heat transfer coefficient of each type of pipe with the mass flow rate; based on the quantitative solution calculation results, when it is analyzed and determined that the parameter optimization plan of the internal threaded pipe can meet the design requirements, the three-dimensional model of the internal threaded pipe is loaded to form a corresponding forming mold according to the parameter optimization plan of the internal threaded pipe; the ball spinning process is simulated for the three-dimensional model and the forming mold, and a finite element analysis is performed; the design parameters of the forming mold are adjusted according to the finite element analysis results until it is determined that the forming mold can meet the forming design requirements of the parameter optimization plan for the internal threaded pipe.

[0113] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of complete hardware embodiments, complete software embodiments, or embodiments in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code. The scheme in the embodiments of the present application can be implemented in various computer languages, for example, object-oriented programming language Java and literal scripting language JavaScript, etc.

[0114] The present application is described with reference to the flowcharts and / or block diagrams of the methods, systems and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of the processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0115] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0116] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0117] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0118] Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for optimizing the structural dimensions of an internally threaded copper tube, characterized in that: The following steps are involved: Determine the mass flow rate range and the corresponding calculation model of the internally threaded pipe, and obtain a transformation relationship fitting curve corresponding to any mass flow rate value within the mass flow rate range according to the calculation model; Determine the influence of heat transfer coefficient and meter weight on the correlation coefficient of internal threaded pipe teeth, and obtain the heat transfer coefficient change law curve and meter weight change law curve respectively; According to the transformation relationship fitting curve, the heat transfer coefficient change law curve and the meter-gram weight change law curve, the relevant geometric parameters of the internal threaded pipe are adjusted to form a parameter optimization scheme for the internal threaded pipe; According to the parameter optimization scheme, a three-dimensional model corresponding to the internally threaded pipe is established, and based on the three-dimensional model, the heat transfer coefficients of the bare pipe, the internally threaded pipe before optimization, and the internally threaded pipe after optimization at the same level are quantitatively solved and calculated to obtain the heat transfer change relationship of the pipe and the change relationship of the heat transfer coefficient of each type of pipe with the mass flow rate; According to the quantitative solution calculation results, when it is analyzed and determined that the parameter optimization scheme of the internal threaded pipe can meet the design requirements, the internal threaded pipe three-dimensional model is loaded to form a corresponding forming die according to the parameter optimization scheme of the internal threaded pipe; Simulating a ball spinning process on the three-dimensional model and the forming die, and performing finite element analysis; Adjust the design parameters of the forming die according to the finite element analysis results until it is determined that the forming die can meet the forming design requirements of the internal threaded pipe parameter optimization solution; The transformation relationship fitting curve acquisition comprises the following steps: Determine the mass flow rate range and corresponding calculation model of the internal threaded pipe, and determine the critical values ​​of the transformation of several internal threaded pipes corresponding to the two mass flow rate endpoints according to the calculation model Extract the transition threshold Perform data fitting to obtain the transformation relationship fitting curves corresponding to the two mass flow rate endpoint values; The transformation relationship fitting curves corresponding to the two mass flow rate endpoint values ​​are linearly interpolated to obtain the transformation relationship fitting curve corresponding to any mass flow rate value within the mass flow rate range.

2. The method for optimizing the structural dimensions of an internally threaded copper tube according to claim 1, characterized in that: When adjusting the relevant geometric parameters of the internal threaded pipe, it is necessary to comprehensively consider the reduction of meter weight, the maintenance of heat transfer coefficient, the pressure drop during the use of the pipe, the influence of subsequent bending and expansion secondary processing, and the difficulty of processing and manufacturing based on the transformation relationship fitting curve, the heat transfer coefficient change law curve and the meter weight change law curve.

3. The method for optimizing the structural dimensions of an internally threaded copper tube according to claim 1, characterized in that: The finite element analysis performed on the three-dimensional model includes spinning metal deformation analysis, die stress analysis, forming defect analysis, plastic strain analysis and metal flow analysis.

4. The method for optimizing the structural dimensions of an internally threaded copper tube according to claim 3, characterized in that: The spinning metal deformation analysis is to determine the position distribution and deformation amount of the deformation area of ​​the threaded copper tube tooth structure by finite element simulation of the stress distribution of the tube blank during the ball spinning process. The deformation area includes the formed area, the deformation area and the area to be deformed.

5. The method for optimizing the structural dimensions of an internally threaded copper tube according to claim 4, characterized in that: The mold force analysis is to simulate the load changes of the core head and the steel ball during the deformation process during the ball spinning process through finite element simulation, and determine the radial load distribution change curve and the axial load distribution change curve of the forming mold.

6. The method for optimizing the structural dimensions of an internally threaded copper tube according to claim 5, characterized in that: The forming defect analysis is to simulate the tube cross-section tooth forming process during the ball spinning process by finite element analysis, and determine the location and formation causes of surface defects on the internal threaded copper tube during the forming process.

7. The method for optimizing the structural dimensions of an internally threaded copper tube according to claim 6, characterized in that: The plastic strain analysis is to simulate the strain distribution of the internal threaded copper tube during the ball spinning process by finite element method, and determine the stress distribution change process formed by the tooth structure of the internal threaded copper tube during the spinning of the forming mold.

8. The method for optimizing the structural dimensions of an internally threaded copper tube according to claim 7, characterized in that: The metal flow analysis is to simulate the flow vector distribution of the metal during the ball spinning process through finite element simulation, determine the flow rate and direction of the metal in the tooth structure of the internal threaded copper tube, and determine the folding area on the inner surface of the internal threaded copper tube.

9. A system for optimizing the structural dimensions of an internally threaded copper tube, using the method for optimizing the structural dimensions of an internally threaded copper tube as claimed in any one of claims 1 to 8, characterized in that: include: The parameter analysis module is used to determine the mass flow rate range of the internally threaded pipe and the corresponding calculation model, and obtain the transformation relationship fitting curve corresponding to any mass flow rate value within the mass flow rate range according to the calculation model; determine the influence of the heat transfer coefficient and the meter weight on the internally threaded pipe tooth correlation coefficient, and obtain the heat transfer coefficient change law curve and the meter weight change law curve respectively; A scheme forming module, used to adjust the relevant geometric parameters of the internally threaded pipe according to the transformation relationship fitting curve, the heat transfer coefficient variation law curve and the meter-gram weight variation law curve, so as to form a parameter optimization scheme for the internally threaded pipe; A model analysis module is used to establish a three-dimensional model corresponding to the internally threaded pipe according to the parameter optimization scheme, and based on the three-dimensional model, quantitatively solve and calculate the heat transfer coefficients of the bare pipe, the internally threaded pipe before optimization, and the internally threaded pipe after optimization at the same level, to obtain the heat transfer change relationship of the pipe and the change relationship of the heat transfer coefficient of each type of pipe with the mass flow rate; The mold loading module is used to analyze and determine that the parameter optimization scheme of the internal threaded pipe can meet the design requirements based on the quantitative solution calculation results. According to the parameter optimization scheme of the internal threaded pipe, the internal threaded pipe three-dimensional model is loaded to form a corresponding forming mold; A finite element analysis module, simulating a ball spinning process on the three-dimensional model and the forming die, and performing finite element analysis; The mold optimization module adjusts the design parameters of the molding mold according to the finite element analysis results until it is determined that the molding mold can meet the molding design requirements of the internal thread pipe parameter optimization solution.

10. An electronic device, characterized in that: The method comprises a memory, a processor and a computer program stored in the memory and executable on the processor. When the processor executes the program, the steps of the method for optimizing the structural dimensions of an internally threaded copper tube as described in any one of claims 1 to 8 are implemented.

11. A computer-readable storage medium, characterized in that: The storage medium stores a computer program, which, when executed by a processor, implements the steps of the method for optimizing the structural dimensions of an internally threaded copper tube as described in any one of claims 1 to 8.

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