Hot melting cutter structure design method based on multi-pass extrusion principle, product, medium and equipment

Abstract

The invention discloses a hot melting cutter structure design method based on the multi-pass extrusion principle, a product, a medium and equipment, and relates to the technical field of plastic machining cutters, the method comprises the steps that linear load warm extrusion simulation is conducted on a machined material, a strain curve graph is obtained, fitting processing and size transformation are conducted, and a corresponding contour curve is obtained; feature clustering analysis is conducted on the contour curve, a contour model of the machined material is determined, and geometric constraint conditions of the cutter contour are constructed; according to geometric constraint conditions, determining a radial stress-strain model of the processed material in the extrusion processing process of the hot melting drill; a multi-pass extrusion principle is adopted to design the contour of a working cone of the hot-melt drill, and contour analysis and an elastic-plastic mechanics principle are adopted to design the contour of a press-in cone of the hot-melt drill; and the design of the hot melting cutter structure is completed by combining the contour design of a hot melting drill working cone and the contour design of a hot melting drill press-in cone. The machining surface quality and the production efficiency of the hot melting cutter can be effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of plastic processing tools, and in particular to a hot melt tool structure design method, product, medium and equipment based on the multi-pass extrusion principle. Background Art

[0002] The melt drill process is to use a high-speed rotating melt drill to contact the surface of the product and apply downward axial pressure. The melt drill head rubs against the metal and generates high temperature, which quickly softens the processed material in the vicinity. While the melt drill squeezes and penetrates, the softened material is partially stretched into a boss, which can be tapped or drilled on the surface of the hole wall to complete the filling or connection function.

[0003] The current hot melt drill design generally adopts a simple single-stage conical drill tip design, which does not take into account the elastic-plastic properties of the processed material. Therefore, the hole wall will rebound and uneven after processing, and the surface finish and roughness will be greatly affected. In addition, because the hot melt drill process is a high-temperature chipless hole forming process, the processing is accompanied by severe extrusion pressure and friction heat, which causes a great change in the surface structure of the processed material, and there is uneven surface residual stress, which leads to a decrease in the quality and efficiency of subsequent machining.

[0004] In summary, in response to the problems of the current hot melt drilling process, it is necessary to propose a hot melt tool structure design method that can perform standardized design according to the characteristics of different processed materials, so as to improve the processing surface quality of the hot melt tool and improve production efficiency. Summary of the invention

[0005] The purpose of this application is to provide a hot melt tool structure design method, product, medium and equipment based on the multi-pass extrusion principle, which can effectively improve the processing surface quality and production efficiency of the hot melt tool.

[0006] To achieve the above objectives, this application provides the following solutions:

[0007] In a first aspect, the present application provides a method for designing a hot melt tool structure based on the multi-pass extrusion principle, comprising:

[0008] Conduct linear load warm extrusion simulation on the processed material to obtain the strain curve diagram;

[0009] After fitting and size transformation based on the strain curve diagram, the corresponding contour curve is obtained;

[0010] Perform feature cluster analysis on the contour curve to determine the contour model of the processed material;

[0011] Based on the geometric profile characteristics of the profile model, the geometric constraints of the tool profile are constructed;

[0012] According to the geometric constraints, a radial stress-strain model of the processed material during the hot melt drilling extrusion process is determined; the radial stress-strain model includes a radial stress model and a radial strain model;

[0013] Based on the radial stress-strain model, the working cone profile of the hot melt drill is designed using the multi-pass extrusion principle.

[0014] Based on the radial stress-strain model, contour analysis and elastic-plastic mechanics principles are used to design the hot melt drill press cone profile.

[0015] The design of the hot melt tool structure is completed by combining the hot melt drill working cone profile design and the hot melt drill pressing cone profile design.

[0016] Optionally, performing a linear load warm extrusion simulation on the processed material to obtain a strain curve diagram specifically includes:

[0017] The processed material is subjected to linear load warm extrusion simulation. During the linear load warm extrusion simulation, multiple groups of experiments are carried out by changing the load feed speed and deformation temperature to obtain the deformation and strain of the processed material under different experimental conditions, and the strain conditions at different distances from the extrusion processing surface are extracted to draw strain curves.

[0018] Optionally, the corresponding contour curve is obtained after fitting and size transformation based on the strain curve diagram, specifically including:

[0019] Based on the strain curve diagram, the strain curve is subjected to polynomial fitting processing to obtain the strain characteristic curve of the processed material;

[0020] The strain characteristic curve is processed by coordinate transformation according to the axial length and diameter of the hot melt drill designed as needed to calculate the contour, and the corresponding contour curves under different experimental conditions are obtained.

[0021] Optionally, performing feature cluster analysis on the contour curve to determine the contour model of the processed material specifically includes:

[0022] The contour curves simulated under different experimental conditions were subjected to feature cluster analysis. The "fir tree-type" hot melt drill contour model was used to summarize the contour curve features according to the contour curve peak value, the number of contour curve peaks, and the contour curve peak spacing characteristics, and the key control parameters were determined to construct the contour model of the processed material; the key control parameters include: the number of convex hulls n, the working length L, the cone tip height h 0 , tooth lift h, taper tooth height H, tooth pitch P, drill bit radius R and drill tip blunt circle radius r.

[0023] Optionally, the geometrical contour characteristics based on the contour model are used to construct the geometrical constraints of the tool contour, specifically including:

[0024] Based on the geometric profile characteristics of the contour model, the geometric constraints of the tool contour are constructed as follows:

[0025]

[0026] Optionally, determining the radial stress-strain model of the processed material during the hot melt drilling extrusion process according to the geometric constraints specifically includes:

[0027] According to the geometric constraints, the radial stress model of the processed material during the hot melt drilling extrusion process is determined as follows: Among them, σ y is the radial stress of the processed material; q is the external load; v is the friction coefficient; α is the cone angle; ξ is the load factor.

[0028] Optionally, the step of determining the radial stress-strain model of the material being processed during the hot melt drilling extrusion process according to the geometric constraints further includes:

[0029] According to the geometric constraints, the radial strain model of the processed material during the hot melt drilling extrusion process is determined as follows:

[0030] Among them, ε y is the radial strain of the processed material; σ x is the axial stress of the processed material; y is the radial stress of the processed material; E is the elastic modulus of the processed material; μ is the Poisson's ratio of the processed material; k is the yield limit parameter; σ s is the yield limit of the processed material; v is the friction coefficient; l is the length of the extrusion area.

[0031] In a second aspect, the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the hot melt tool structure design method based on the multi-pass extrusion principle.

[0032] In a third aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the hot melt tool structure design method based on the multi-pass extrusion principle.

[0033] In a fourth aspect, the present application provides a computer device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the hot melt tool structure design method based on the multi-pass extrusion principle.

[0034] According to the specific embodiments provided in this application, this application discloses the following technical effects:

[0035] The present application provides a hot melt tool structure design method, product, medium and equipment based on the multi-pass extrusion principle. In view of the problems of existing hot melt hole processing tools, the hot melt hole processing tool structure is optimized and designed based on the multi-pass extrusion principle. By conducting a linear load temperature extrusion simulation experiment, a radial stress-strain model of the processed material is constructed, and then the multi-pass extrusion principle, contour analysis and elastic-plastic mechanics principle are used to complete the design of the hot melt tool structure. The hot melt tool structure design method based on the multi-pass extrusion principle of the present application can standardize the tool design according to the characteristics of different processed materials, improve the processing surface quality and production efficiency of the hot melt tool, and in addition, the hot melt tool structure design method, product, medium and equipment based on the multi-pass extrusion principle of the present application can also complete the processing of one-time high-temperature chipless forming holes and improve the surface integrity of the hole wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 A flow chart of the hot melt tool structure design method based on the multi-pass extrusion principle provided in this application;

[0038] Figure 2 A simulation model diagram of the load extrusion strain of the titanium alloy wire provided in this application;

[0039] Figure 3 The titanium alloy extrusion strain curve provided for this application;

[0040] Figure 4 Contour graph provided for this application;

[0041] Figure 5 Schematic diagram of the hot melt drill tool outline provided for this application;

[0042] Figure 6 Optimization diagram of the number of convex hulls provided for this application;

[0043] Figure 7 Schematic diagram of a multi-convex hull design tool provided for this application;

[0044] Figure 8 Schematic diagram of the continuous cone design tool provided for this application;

[0045] Fig. 9 Schematic diagram of the continuous surface design tool provided for this application. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0047] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0048] The hot melt tool structure design method based on the multi-pass extrusion principle in this application includes several parts: warm extrusion stress curve simulation, tool profile curve modulation, tool profile feature summary and tool profile key feature parameter optimization. The specific design process is shown below.

[0049] like Figure 1 As shown, the present application discloses a method for designing a hot melt tool structure based on the multi-pass extrusion principle, comprising:

[0050] First, for the warm extrusion stress curve simulation part, it is necessary to perform extrusion simulation on the processed material, obtain the stress curve under warm extrusion load, and perform numerical analysis of the curve to obtain the corresponding contour curve.

[0051] Step 1: Perform linear load warm extrusion simulation on the processed material to obtain the strain curve.

[0052] The processed material is subjected to linear load and warm extrusion simulation. During the linear load and warm extrusion simulation, multiple groups of experiments are carried out by changing the load feed speed and deformation temperature to obtain the deformation and strain of the processed material under different experimental conditions, and the processing strain conditions at different distances from the extrusion processing surface are extracted to draw strain curves.

[0053] As a specific embodiment, the load feed speed can be 6mm / min, 9mm / min, and 12mm / min, the deformation temperature can be 660°C, 730°C, and 800°C, and the distance from the extrusion processing surface can be 0.1mm, 0.2mm, and 0.3mm. Through any combination of the above conditions, the deformation and strain of the processed material under different conditions can be obtained, thereby drawing a strain curve diagram.

[0054] Step 2: After fitting and size transformation based on the strain curve diagram, the corresponding contour curve is obtained.

[0055] After obtaining the strain curve diagram under different experimental conditions through step 1, the strain curve is fitted based on the strain curve diagram to obtain the strain characteristic curve of the processed material. Among them, as a preferred technical solution, the present application adopts a polynomial fitting processing method, but the fitting method is not limited to polynomial fitting.

[0056] After obtaining the strain characteristic curve of the processed material, the strain characteristic curve is processed by coordinate transformation according to the axial length and diameter of the hot melt drill to be designed, and the horizontal coordinate of the strain characteristic curve is normalized and enlarged to the axial length of the hot melt drill to complete the horizontal coordinate transformation, and the vertical coordinate is normalized and enlarged to the diameter of the hot melt drill to complete the vertical coordinate transformation, so as to obtain the corresponding hot drill contour curve (referred to as contour curve) under different experimental conditions.

[0057] Specifically, the maximum and minimum value normalization method is used to calculate the contour, and the coordinate processing formula is:

[0058]

[0059] In the formula, X represents the original coordinate value, X max is the maximum value of the original coordinate, X min is the minimum value of the original coordinate, D is the diameter of the hot melt drill, X new is the coordinate value after transformation.

[0060] Step 3: Perform feature clustering analysis on the contour curve to determine the contour model of the processed material.

[0061] The contour curves obtained by simulation under different experimental conditions are clustered and analyzed, and a "fir tree-type" hot melt drill contour model is proposed. The contour curve characteristics are summarized based on the contour curve peak value, the number of contour curve peaks, and the contour curve peak spacing characteristics. The key control parameters that can describe the above contour curve characteristics and describe the contour curve are determined, thereby constructing a contour model of the processed material. The key control parameters of the geometric contour determined in this application include: the number of convex hulls n, the working length L, and the cone tip height h. 0 , tooth lift h, taper tooth height H, tooth pitch P, drill bit radius R and drill tip blunt circle radius r and other parameters.

[0062] Step 4: Based on the geometric profile characteristics of the contour model, the geometric constraints of the tool contour are constructed.

[0063] According to the geometric contour characteristics of the tool contour model, the geometric constraints of the tool contour are constructed. The heights of the vertices of different convex hull contours of the hot melt drill in this application are distributed in steps, the height difference of different convex hull contours is the tooth lift h, the convex hull contour width is the tooth pitch P, and the drill radius R and the working length L of the hot melt drill are calculated as follows:

[0064]

[0065] The main working section of the hot melt drill in this application can be approximated as a right triangle, with the right angle sides being the tooth height H and the half tooth pitch P / 2, and the cone angle α is calculated as follows:

[0066]

[0067] Step 5: According to the geometric constraints, the radial stress-strain model of the processed material during the hot melt drilling extrusion process is determined.

[0068] The hole wall stress distribution model of the processed material is designed based on the plane strain condition and the fourth strength theory of material mechanics. The radial strain of the processed hole of the processed material during the hot melt drilling extrusion process can be obtained by solving the radial stress strain model. The radial stress strain model includes a radial stress model and a radial strain model.

[0069] Based on plane strain conditions, a radial stress model of the processed material during hot melt drilling extrusion processing is proposed. The radial stress-strain model proposed in this application is based on plane strain conditions and includes the following assumptions:

[0070] 1) Extrusion stress σ x and σ y are independent of the radial coordinates of the material being processed, where σ x , σ y They represent the axial and radial extrusion stresses inside the processed material respectively.

[0071] 2) During the extrusion process, the yield condition can be:

[0072] σ x -σ y = ±2k (4)

[0073] Where k is the yield limit parameter.

[0074] Combined with the tool geometry model (contour model) obtained in step 3, it can be seen that the radial stress model of the processed material during the hot melt drilling extrusion process under plane strain conditions is:

[0075]

[0076] Among them, σ y is the radial stress of the processed material; q is the external load; v is the friction coefficient; α is the cone angle; ξ is the load factor.

[0077] In the plane strain extrusion problem, the stress of the extruded material and the axial extrusion force have the following relationship:

[0078]

[0079] This application uses the fourth strength theory of material mechanics to obtain the yield limit parameter Where σ s is the yield limit of the material being processed.

[0080] According to the hot drill tool geometric model proposed in this application, the relationship between the hot drill extrusion cone angle α and the extrusion area length l can be obtained as follows:

[0081]

[0082]

[0083] Where f is the tool feed speed.

[0084] In the plane strain problem considered in this application, the relationship between stress and strain satisfies the generalized Hooke's law, that is:

[0085]

[0086] In the formula, ε x , ε y They represent the axial and radial strains of the processed material, respectively; E is the elastic modulus of the processed material; μ is the Poisson's ratio of the processed material, γ xy Represents the shear strain of the processed material in the plane perpendicular to the axial direction, τ xy It represents the shear stress of the processed material in the plane perpendicular to the axial direction, and G is the shear modulus of the processed material.

[0087] From the yield condition under plane strain conditions and the fourth strength theory, the stress relationship under material yield can be obtained as:

[0088]

[0089] Based on the material stress-strain model analysis and tool geometry model design, the radial strain model of the processed material during the melt drill extrusion process can be obtained as follows:

[0090]

[0091] Step 6: Based on the radial stress-strain model, the working cone profile of the hot melt drill is designed using the multi-pass extrusion principle.

[0092] Based on the functional characteristics of different tool positions, this application divides the melt drill design into two parts: the working cone profile design and the pressing cone profile design. The pressing cone is the part where the tip of the melt drill fully contacts the surface of the material being processed, which is used to generate heat through friction and generally has a larger taper. The working cone is the part of the pressing cone that is far away from the drill tip at the rear end, which is used to form a high-quality processing hole wall and generally has a smaller taper than the pressing cone.

[0093] The present application designs the working cone profile of a hot melt drill based on the multi-pass extrusion principle.

[0094] Specifically, the key control parameters of the working cone profile are optimized from two aspects: uniform rheological optimization design of radial stress of the processed material and bending and torsional strength verification of the working cone segment, so as to achieve the effect of uniform rheology of the processed material and reduce the thickness of the processed metamorphic layer.

[0095] The uniform rheological optimization method for radial stress of the processed material is as follows: by analyzing different independent variables (convex hull number n, tooth lift h, working length L) under the same drill radius R and different extrusion area lengths l of the processed material, the strain ε is calculated. y Changes are made, and the variance differences of strain values ​​are compared to find the optimal geometric parameters that satisfy the radial uniform rheology of the processed material.

[0096] The strength check position of the working cone section is the narrowest part of the hot melt drill.

[0097] Step 7: Based on the radial stress-strain model, contour analysis and elastic-plastic mechanics principles are used to design the hot melt drill press cone contour.

[0098] Based on the contour analysis and elastic-plastic mechanics principles, the contour design of the hot melt drill pressing cone is carried out.

[0099] Specifically, the key control parameters of the press cone profile are optimized from four aspects: uniform rheological design of the hot melt drill tip, optimization of geometric equation reasoning, optimization of tool-workpiece elastic-plastic deformation, and drill tip strength verification, to ensure tool strength and life. When the hot melt drill is working, the narrowest radius, i.e., the cone tip height h 0 The torsional strength conditions of the melt drill must be met, namely:

[0100]

[0101] Among them, τ max is the maximum allowable shear stress, W t is the torsional section coefficient of the processed material, and T is the section torque.

[0102] Step 8: Combine the hot melt drill working cone profile design and the hot melt drill press cone profile design to complete the hot melt tool structure design.

[0103] Under the premise of ensuring the strength of the drill tip and the smooth transition between the drill tip and the working section, the large plastic deformation of the processed material is achieved, and the uniform rheology of the processed material during the processing is assisted, the value of the hot melt drill profile control parameter is determined, and the hot melt drill profile is optimized. On the basis of retaining key features such as the height difference of the convex hull profile (tooth lift) and the width of the convex hull profile (tooth pitch), the above design method is optimized, the hot drill profile is modified to an external convex cone surface or a continuous curved surface, and a convex structure is designed on the cone surface to achieve a multi-pass extrusion effect.

[0104] As a specific embodiment, based on the hot melt tool structure design method based on the multi-pass extrusion principle provided by the present application, the TC is completed by optimizing the tool geometry design. 4 The processing of high-temperature chipless forming holes in titanium alloy materials can improve the surface integrity of the hole wall. First, the online load temperature extrusion simulation is carried out under various working conditions for the processed titanium alloy materials, and the strain characteristic curve is extracted for feature analysis, and the different experimental strain characteristic curves are transformed in size to obtain the corresponding modulation contour curve; the obtained modulation contour curve is subjected to data fitting processing and feature clustering to obtain the titanium alloy extrusion modulation contour model, and the key parameters of the contour model are determined; based on the obtained contour model, the geometric constraints of the model parameters are established; according to the extrusion process, the stress distribution model of the titanium alloy hole wall during the extrusion process is established; the variance optimal method is used to optimize the contour geometric parameters, so that the circumferential stress of the titanium alloy hole wall is uniform, and the optimal physical solution is obtained; the hot melt drill structure for processing titanium alloy holes is determined by combining the geometric constraints, physical constraints and parameter safety verification results.

[0105] like Figure 2 The simulation model of titanium alloy wire load extrusion strain is shown, in which the connection end is a homogeneous solid material and the free end has a gap for material flow. The simulation load feed speed is 6mm / min, 9mm / min, 12mm / min, and the deformation temperature is 660℃, 730℃, 800℃.

[0106] like Figure 3 The titanium alloy extrusion strain curves obtained under different experimental environments are simulated as shown in the figure. Polynomial fitting is performed on the titanium alloy extrusion strain curves, and the contour is copied according to the hot melt drill design requirements. Figure 4 Hot drill profile curve shown.

[0107] like Figure 5 As shown in the figure, the characteristics of different hot drilling profile curves are analyzed, and a "fir tree type" tool profile is proposed. The heights of the vertices of different convex hull profiles are distributed in a stepped manner, the height difference is the tooth lift h, and the convex hull profile width is the tooth pitch P.

[0108] The contour of the main working section of the hot melt drill can be approximated as a right triangle, with the right-angled sides being the tooth height H and the half tooth pitch P / 2, and the cone angle α can be calculated.

[0109] According to the tool geometry model, the hot melt drill tool needs to meet the geometric constraints. When the hot melt drill is working, the narrowest radius, i.e., the cone tip height h 0 The torsional strength condition of the hot melt drill must be met, that is Among them, G is 4100MPa, W tis the torsional section coefficient, T is the section torque, and according to the simulation results and references, T is taken as 800N·mm. After calculation, the cone tip height h of the drill bit is 0 Should not be less than 0.5mm.

[0110] The strain ε is calculated by analyzing different independent variables (convex hull number n, tooth lift h, working length L) under the same drill radius R and different extrusion area lengths l of the processed material. y Changes are made, and the variance differences of strain values ​​are compared to find the optimal geometric parameters that satisfy the radial uniform rheology of the processed material.

[0111] According to the radial strain model of titanium alloy material, the number of convex hulls n is taken in the interval [1, 6] for optimization calculation, and the strain variance on the strain working length L is obtained as follows: Figure 6 As shown, it can be found that the variance is very large when n=1, and the variance is significantly reduced when n is greater than 1. Considering the drill tip processing problem, the optional convex hull number n ranges from 2, 3, and 4.

[0112] Under different convex hull numbers n, the tooth lift h is optimized and different optimal working lengths L are obtained.

[0113] The changes in radial pressure distribution caused by different drill tip blunt circles were analyzed and the drill tip blunt circle was optimized. The radial pressure distribution variance was calculated when the number of convex hulls n was 2, 3, and 4. After analysis, when the blunt circle radius r was greater than 0.11 mm, the radial stress distribution variance was small and had good uniformity. Considering the drill tip strength, the working cone tip blunt circle radius r can be taken as 0.2 mm, and the following is obtained: Figure 7 Schematic diagram of the convex hull design tool shown.

[0114] The convex hull structure was optimized and the hot drill profile was modified into a continuous cone surface, which achieved the requirement of continuous contact and continuous heating between the tool and the material. A convex structure was designed on the cone surface, and the convex hull structure design was retained, so that the tool could modulate the flow of titanium alloy material, and the following results were obtained: Figure 8 The schematic diagram of the continuous cone design tool is shown in Fig. 9 Schematic diagram of continuous surface design tool shown.

[0115] In summary, the structural design of the hot melt drill bit for processing titanium alloy materials is completed.

[0116] In some embodiments, the present application also provides a computer program product, including a computer program, which, when executed by a processor, implements the hot melt tool structure design method based on the multi-pass extrusion principle.

[0117] In some embodiments, the present application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the hot melt tool structure design method based on the multi-pass extrusion principle.

[0118] In some embodiments, the present application also provides a computer device, including a processor, a memory, an input / output interface (I / O for short), a communication interface, and a computer program stored in the memory and runnable on the processor, and the processor executes the computer program to implement the hot melt tool structure design method based on the multi-pass extrusion principle.

[0119] The processor, memory and input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store pending transactions. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, the hot melt tool structure design method based on the multi-pass extrusion principle is implemented.

[0120] It should be noted that the object information (including but not limited to object device information, object personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the object or fully authorized by all parties, and the collection, use and processing of relevant data need to comply with relevant laws, regulations and standards of relevant countries and regions.

[0121] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ReadOnlyMemory, ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0122] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0123] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A hot melt tool structure design method based on the multi-pass extrusion principle, It is characterized in that include: Conduct linear load warm extrusion simulation on the processed material to obtain the strain curve diagram; After fitting and size transformation based on the strain curve diagram, the corresponding contour curve is obtained; Perform feature cluster analysis on the contour curve to determine the contour model of the processed material; Based on the geometric profile characteristics of the profile model, the geometric constraints of the tool profile are constructed; According to the geometric constraints, a radial stress-strain model of the processed material during the hot melt drilling extrusion process is determined; the radial stress-strain model includes a radial stress model and a radial strain model; Based on the radial stress-strain model, the working cone profile of the hot melt drill is designed using the multi-pass extrusion principle. Based on the radial stress-strain model, contour analysis and elastic-plastic mechanics principles are used to design the hot melt drill press cone profile. The design of the hot melt tool structure is completed by combining the hot melt drill working cone profile design and the hot melt drill pressing cone profile design.

2. According to the hot melt tool structure design method based on the multi-pass extrusion principle of claim 1, It is characterized in that The method of performing linear load warm extrusion simulation on the processed material to obtain a strain curve diagram specifically includes: The processed material is subjected to linear load warm extrusion simulation. During the linear load warm extrusion simulation, multiple groups of experiments are carried out by changing the load feed speed and deformation temperature to obtain the deformation and strain of the processed material under different experimental conditions, and the strain conditions at different distances from the extrusion processing surface are extracted to draw strain curves.

3. The hot melt tool structure design method based on the multi-pass extrusion principle according to claim 2, It is characterized in that After fitting and dimension transformation based on the strain curve diagram, the corresponding contour curve is obtained, which specifically includes: Based on the strain curve diagram, the strain curve is subjected to polynomial fitting processing to obtain the strain characteristic curve of the processed material; The strain characteristic curve is processed by coordinate transformation according to the axial length and diameter of the hot melt drill designed as needed to calculate the contour, and the corresponding contour curves under different experimental conditions are obtained.

4. The hot melt tool structure design method based on the multi-pass extrusion principle according to claim 3, It is characterized in that The characteristic clustering analysis of the contour curve to determine the contour model of the processed material specifically includes: The contour curves obtained by simulation under different experimental conditions were subjected to feature clustering analysis. The "fir tree-type" hot melt drill contour model was used to summarize the contour curve features according to the contour curve peak value, the number of contour curve peaks, and the contour curve peak spacing characteristics, and the key control parameters were determined to construct the contour model of the processed material; the key control parameters include: the number of convex hulls n, the working length L, the cone tip height h 0 , tooth lift h, taper tooth height H, tooth pitch P, drill bit radius R and drill tip blunt circle radius r.

5. The hot melt tool structure design method based on the multi-pass extrusion principle according to claim 4, It is characterized in that The geometrical contour characteristics based on the contour model are used to construct the geometrical constraints of the tool contour, which specifically include: Based on the geometric profile characteristics of the contour model, the geometric constraints of the tool contour are constructed as follows:

6. The hot melt tool structure design method based on the multi-pass extrusion principle according to claim 4, It is characterized in that Determining the radial stress-strain model of the processed material during the hot melt drilling extrusion process according to the geometric constraints specifically includes: According to the geometric constraints, the radial stress model of the processed material during the hot melt drilling extrusion process is determined as follows: Among them, σ y is the radial stress of the processed material; q is the external load; v is the friction coefficient; α is the cone angle; ξ is the load factor.

7. The hot melt tool structure design method based on the multi-pass extrusion principle according to claim 4, It is characterized in that The step of determining the radial stress-strain model of the material being processed during the hot melt drilling extrusion process according to the geometric constraints also includes: According to the geometric constraints, the radial strain model of the processed material during the hot melt drilling extrusion process is determined as follows: Among them, ε y is the radial strain of the processed material; σ x is the axial stress of the processed material; y is the radial stress of the processed material; μ is the Poisson's ratio of the processed material; E is the elastic modulus of the processed material; k is the yield limit parameter; σ s is the yield limit of the processed material; v is the friction coefficient; l is the length of the extrusion area.

8. A computer program product comprising a computer program, It is characterized in that When the computer program is executed by a processor, the hot melt tool structure design method based on the multi-pass extrusion principle described in any one of claims 1 to 7 is implemented.

9. A computer-readable storage medium having a computer program stored thereon, It is characterized in that When the computer program is executed by a processor, the hot melt tool structure design method based on the multi-pass extrusion principle described in any one of claims 1 to 7 is implemented.

10. A computer device, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the hot melt tool structure design method based on the multi-pass extrusion principle as described in any one of claims 1 to 7.

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