Kinetic analysis method, device and equipment for middle planing table type boring and milling machine and medium

Abstract

The invention relates to a kinetic analysis method, device, equipment and medium for a centrally-mounted planing table type boring and milling machine, and belongs to the technical field of machine tools. The kinetic analysis method for the centrally-mounted planing table type boring and milling machine comprises the steps that a three-dimensional solid model of the centrally-mounted planing table type boring and milling machine is constructed, and static analysis is conducted on the three-dimensional solid model of the centrally-mounted planing table type boring and milling machine; stress distribution of the middle planing table type boring and milling machine under the gravity load is obtained, the safety coefficient of the middle planing table type boring and milling machine is calculated based on the stress distribution, dynamic characteristic analysis is conducted on the three-dimensional solid model of the middle planing table type boring and milling machine, and the first six-order inherent frequency of the middle planing table type boring and milling machine under the free vibration environment is calculated; and the machining precision of the boring-milling machine is improved.

Description

Technical Field

[0001] The invention relates to the technical field of machine tools, and in particular to a dynamics analysis method, device, equipment and medium for a center-mounted planer-type boring and milling machine. Background Art

[0002] As an important mechanical processing equipment, the boring and milling machine combines the processing functions of boring machines and milling machines. It can complete the processing of complex features of parts such as drilling, milling, and milling grooves at one time. Therefore, the boring and milling machine is widely used in aerospace, national defense and military manufacturing, shipbuilding, petroleum machinery and other industries.

[0003] The static and dynamic characteristics of boring and milling machines are one of the important factors affecting machining accuracy and stability. The main factors of the static and dynamic characteristics of boring and milling machines come from the key components of boring and milling machines, including: column, spindle box, spindle and bed, etc. The existing technology mainly focuses on the research of key components of boring and milling machines, including static and dynamic characteristics analysis of spindle and spindle box, structural optimization of beam, etc., but there is less research on the overall structure of boring and milling machines.

[0004] However, static and dynamic research on the key components of boring and milling machines cannot fully reflect the actual working status of boring and milling machines, resulting in low machining accuracy and stability of boring and milling machines. Summary of the invention

[0005] In view of this, it is necessary to provide a dynamic analysis method, device, equipment and medium for a center-mounted planer-type boring and milling machine to solve the technical problem that there is little research on the overall structure of the boring and milling machine, resulting in low machining accuracy and stability of the boring and milling machine.

[0006] In order to solve the above problems, the present invention provides a dynamic analysis method for a center-mounted planer-type boring and milling machine, comprising: Construct a 3D solid model of a center-mounted planer-type boring and milling machine; Performing static analysis on the three-dimensional solid model of the center-mounted planer-type boring and milling machine to obtain the stress distribution of the center-mounted planer-type boring and milling machine under gravity load, and calculating the safety factor of the center-mounted planer-type boring and milling machine based on the stress distribution; The dynamic characteristics of the three-dimensional solid model of the center-mounted planer-type boring and milling machine are analyzed, and the first six natural frequencies of the center-mounted planer-type boring and milling machine under a free vibration environment are calculated.

[0007] In a possible implementation, the construction of a three-dimensional solid model of a center-mounted planer-type boring and milling machine includes: Determine the components of a center-mounted planer-type boring and milling machine, wherein the components at least include a column, a bed, a slide, a spindle box, a worktable, and a saddle, the column adopts a center-mounted double-layer six-guide structure, and the six guides are four-wire and two-hard composite guides; Establishing a three-dimensional solid model of the center-mounted planer-type boring and milling machine component, and obtaining the component properties of the center-mounted planer-type boring and milling machine, wherein the component properties include physical properties, material constitutive properties, friction equations, and dynamic properties; The three-dimensional solid model of the assembled center-mounted planer-type boring and milling machine components is imported into the finite element analysis software, and after the component attributes are assigned to the corresponding components, the components are simplified to generate the three-dimensional solid model of the center-mounted planer-type boring and milling machine.

[0008] In a possible implementation manner, simplifying the components includes: The internal bearing, spacer and nut of the main shaft are simplified into hollow cylinders; The parts and structure of the saddle are simplified.

[0009] In a possible implementation, the static analysis of the three-dimensional solid model of the center-mounted planer-type boring and milling machine to obtain the stress distribution of the center-mounted planer-type boring and milling machine under gravity load includes: Based on the three-dimensional solid model of the center-mounted planer-type boring and milling machine, multiple groups of finite element models are established according to the spindle position and spindle overhang of the center-mounted planer-type boring and milling machine, wherein the spindle position includes the bottom, the middle and the top, and the spindle overhang includes the first spindle overhang, the second spindle overhang and the third spindle overhang; The boundary conditions of the center-mounted planer-type boring and milling machine are set, and based on the multiple sets of finite element models and boundary conditions, linear elastic statics are used to perform static analysis on the three-dimensional solid model of the center-mounted planer-type boring and milling machine with a gravity load applied to obtain the stress distribution of the center-mounted planer-type boring and milling machine.

[0010] In a possible implementation, the calculating of the safety factor of the center-mounted planer-type boring and milling machine based on the stress distribution includes: Determining the maximum stress of the center-mounted planer-type boring and milling machine based on the stress distribution; The yield strength of the material of the center-mounted planer-type boring and milling machine is obtained, and the safety factor of the center-mounted planer-type boring and milling machine is calculated based on the yield strength and the maximum stress.

[0011] In a possible implementation, the dynamic characteristics analysis of the three-dimensional solid model of the center-mounted planer boring and milling machine is performed to calculate the first six natural frequencies of the center-mounted planer boring and milling machine in a free vibration environment, including: Based on the multiple sets of finite element models and boundary conditions, the dynamic characteristics of the three-dimensional solid model of the center-mounted planer table boring and milling machine are analyzed, the natural frequency of the center-mounted planer table boring and milling machine under a free vibration environment is calculated, and the first six natural frequencies of the center-mounted planer table boring and milling machine are determined based on the natural frequency.

[0012] In a possible implementation, the safety factor is calculated as follows: , in, is the safety factor, is the yield strength of the boring and milling machine material, is the maximum stress; The calculation formula of the natural frequency is: , in, is the stiffness matrix, is the mass matrix, For the The natural frequencies of the finite element model, is the frequency vector.

[0013] On the other hand, the present invention also provides a dynamic analysis device for a center-mounted planer-type boring and milling machine, comprising: The boring and milling machine model building module is used to build a 3D solid model of a center-mounted planer-type boring and milling machine; A statics analysis module, used for performing statics analysis on the three-dimensional solid model of the center-mounted planer-type boring and milling machine, obtaining the stress distribution of the center-mounted planer-type boring and milling machine under gravity load, and calculating the safety factor of the center-mounted planer-type boring and milling machine based on the stress distribution; The dynamic characteristic analysis module is used to perform dynamic characteristic analysis on the three-dimensional solid model of the center-mounted planer-type boring and milling machine, and calculate the first six natural frequencies of the center-mounted planer-type boring and milling machine under a free vibration environment.

[0014] In another aspect, the present invention further provides an electronic device, comprising: a processor and a memory; The memory stores a computer-readable program executable by the processor; When the processor executes the computer-readable program, the steps in the dynamic analysis method of the center-mounted planer-type boring and milling machine as described above are implemented.

[0015] On the other hand, the present invention also provides a computer-readable storage medium, which stores one or more programs, and the one or more programs can be executed by one or more processors to implement the steps in the dynamic analysis method of the center-mounted planer table boring and milling machine as described above.

[0016] The beneficial effects of the present invention are as follows: a three-dimensional solid model of a center-mounted planer-type boring and milling machine is constructed, a static analysis is performed on the three-dimensional solid model of the center-mounted planer-type boring and milling machine, the stress distribution of the center-mounted planer-type boring and milling machine under gravity load is obtained, the safety factor of the center-mounted planer-type boring and milling machine is calculated based on the stress distribution, the stress distribution of the boring and milling machine under gravity load is simulated through finite element simulation, and the safety factor is calculated, thereby improving the stability of the boring and milling machine, and a dynamic characteristic analysis is performed on the three-dimensional solid model of the center-mounted planer-type boring and milling machine, and the first six natural frequencies of the center-mounted planer-type boring and milling machine under a free vibration environment are calculated, and the first six natural frequencies of the center-mounted planer-type boring and milling machine are calculated through dynamic characteristic analysis, thereby avoiding resonance and improving the machining accuracy of the boring and milling machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A flow chart of an embodiment of a dynamic analysis method for a center-mounted planer-type boring and milling machine provided by the present invention; Figure 2 A schematic diagram of a center-mounted planer-type boring and milling machine for use in the dynamics analysis method of the center-mounted planer-type boring and milling machine provided by the present invention; Figure 3a The first group of finite element model schematic diagrams of the dynamic analysis method of the center-mounted planer-type boring and milling machine provided by the present invention; Figure 3b The ninth group of finite element model schematic diagrams of the dynamic analysis method of the center-mounted planer-type boring and milling machine provided by the present invention; Figure 4 A schematic diagram of finite element analysis results under gravity load of the dynamic analysis method of the center-mounted planer-type boring and milling machine provided by the present invention; Figure 5a A schematic diagram of the first-order dynamic characteristic analysis results of the dynamic analysis method of the center-mounted planer-type boring and milling machine provided by the present invention; Figure 5b A schematic diagram of the second-order dynamic characteristics analysis results of the dynamics analysis method of the center-mounted planer-type boring and milling machine provided by the present invention; Figure 5c A schematic diagram of the third-order dynamic characteristics analysis results of the dynamics analysis method of the center-mounted planer-type boring and milling machine provided by the present invention; Figure 5d A schematic diagram of the fourth-order dynamic characteristic analysis results of the dynamic analysis method of the center-mounted planer-type boring and milling machine provided by the present invention; Figure 5e A schematic diagram of the fifth-order dynamic characteristic analysis results of the dynamic analysis method of the center-mounted planer-type boring and milling machine provided by the present invention; Figure 5f A schematic diagram of the sixth-order dynamic characteristic analysis results of the dynamic analysis method for a center-mounted planer-type boring and milling machine provided by the present invention; Figure 6A schematic structural diagram of an embodiment of a dynamic analysis device for a center-mounted planer-type boring and milling machine provided by the present invention; Figure 7 A schematic structural diagram of an embodiment of an electronic device provided by the present invention. DETAILED DESCRIPTION

[0018] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0019] The present invention discloses a method, device, equipment and medium for dynamic analysis of a center-mounted planer type boring and milling machine, which can be used in a computer. The method, device or computer-readable storage medium involved in the present invention can be integrated with the above-mentioned device or can be relatively independent.

[0020] A specific embodiment of the present invention discloses a dynamic analysis method for a center-mounted planer-type boring and milling machine, which can be executed by a computer, specifically by one or more processors of the computer. Figure 1 As shown in the figure, the dynamic analysis method of the center-mounted planer type boring and milling machine includes: S101, constructing a three-dimensional solid model of a center-mounted planer-type boring and milling machine; S102, performing static analysis on the three-dimensional solid model of the center-mounted planer-type boring and milling machine to obtain the stress distribution of the center-mounted planer-type boring and milling machine under gravity load, and calculating the safety factor of the center-mounted planer-type boring and milling machine based on the stress distribution; S103. Perform dynamic characteristic analysis on the three-dimensional solid model of the center-mounted planer-type boring and milling machine, and calculate the first six natural frequencies of the center-mounted planer-type boring and milling machine under a free vibration environment.

[0021] Among them, the main components of the center-mounted planer type boring and milling machine include the column, bed, slide, spindle box, worktable, etc. For the schematic diagram of the center-mounted planer type boring and milling machine, please refer to Figure 2 As an important supporting part, the structural shape of the column has a great influence on the bearing capacity of the boring and milling machine. The column adopts a central double-layer six-guide structure, a double contact mode of hard rails plus linear guides, that is, a double contact mode of four-line and two-hard composite guides, which makes the boring and milling machine have high-strength and high-rigidity processing characteristics. At the same time, it provides a solid foundation for the stability of the spindle box movement and ensures the processing accuracy in large-scale processing.

[0022] Compared with the prior art, the present embodiment provides a dynamic analysis method for a center-mounted planer-type boring and milling machine, constructs a three-dimensional solid model of the center-mounted planer-type boring and milling machine, performs static analysis on the three-dimensional solid model of the center-mounted planer-type boring and milling machine, obtains the stress distribution of the center-mounted planer-type boring and milling machine under gravity load, calculates the safety factor of the center-mounted planer-type boring and milling machine based on the stress distribution, performs dynamic characteristic analysis on the three-dimensional solid model of the center-mounted planer-type boring and milling machine, calculates the first six natural frequencies of the center-mounted planer-type boring and milling machine under a free vibration environment, simulates the stress distribution of the center-mounted planer-type boring and milling machine under gravity load through finite element simulation, calculates the safety factor, improves the stability of the center-mounted planer-type boring and milling machine, and calculates the first six natural frequencies of the center-mounted planer-type boring and milling machine through dynamic characteristic analysis, avoids resonance, and improves the machining accuracy of the boring and milling machine.

[0023] In some embodiments, in step S101, a three-dimensional solid model of a center-mounted planer-type boring and milling machine is constructed. First, the components of the center-mounted planer-type boring and milling machine are determined, wherein the components at least include a column, a bed, a slide, a spindle box, a workbench, and a saddle. The column adopts a center-mounted double-layer six-guide structure, and the six guides are four-wire and two-hard composite guides. A three-dimensional solid model of the components of the center-mounted planer-type boring and milling machine is established, that is, a three-dimensional solid model of the boring and milling machine column, bed, slide, spindle box, workbench, etc. is established in a three-dimensional modeling software. The three-dimensional solid model of the central planer boring and milling machine is used to obtain the component properties of the central planer boring and milling machine, including physical properties, material constitutive properties, friction equations, and dynamic properties. Secondly, the three-dimensional solid model of the assembled central planer boring and milling machine components is imported into the finite element analysis software, that is, after the components of the central planer boring and milling machine are assembled, they are imported into the ABAQUS finite element analysis software, and after the component properties are assigned to the corresponding components, the boring and milling machine is meshed as a whole in the finite element analysis software. The global size is 20, the mesh unit adopts tetrahedral mesh, the mesh type selects C3D4 unit, the total number of units is 4625626, and the components are simplified to generate a three-dimensional solid model of a center-mounted planer-type boring and milling machine. The simplification of the components includes: simplifying the spindle and saddle of the center-mounted planer-type boring and milling machine. In the simulation analysis, the column is an important supporting part, and its structural shape has a great influence on the bearing capacity of the boring and milling machine. Therefore, the column is not simplified. The spindle is the main bearing component, and the spindle structure should not be simplified too much. Therefore, when simplifying the spindle, the internal bearings, spacers, and nuts of the spindle are simplified into hollow cylinders, and the chamfers, fillets, threaded holes and other features of the spindle are removed; the saddle connects the column and the spindle, therefore, the saddle is greatly simplified, and the parts and structures of the saddle are simplified, that is, a large number of useless parts are deleted, and some structures are simplified, which can not only ensure the accuracy of the solution, but also reduce the solution time and improve the solution rate.

[0024] In some embodiments, in step S102, a static analysis is performed on the three-dimensional solid model of the center-mounted planer-type boring and milling machine to obtain the stress distribution of the center-mounted planer-type boring and milling machine under gravity load, and the safety factor of the center-mounted planer-type boring and milling machine is calculated based on the stress distribution. Based on the three-dimensional solid model of the center-mounted planer-type boring and milling machine, multiple groups of finite element models are established according to the spindle position and spindle overhang of the center-mounted planer-type boring and milling machine, wherein the spindle position includes the bottom, the middle and the top, and the spindle overhang includes the first spindle overhang, the second spindle overhang, and the spindle overhang. Overhang and third spindle overhang. In the actual processing of the boring and milling machine, the saddle height and spindle extension length will be increased according to the needs. After analyzing the usage of the center-mounted planer boring and milling machine, three spindle positions of the center-mounted planer boring and milling machine are set, namely bottom, middle, and top, and corresponding to three spindle overhangs, namely the first spindle overhang is 0%, the second spindle overhang is 50%, and the third spindle overhang is 100%. A total of 9 groups of finite element models are established. Please refer to the schematic diagram of the first group of finite element models. Figure 3a ,like Figure 3a As shown, the spindle of the center-mounted planer type boring and milling machine is located at the top, and the spindle overhang is 0%. For the schematic diagram of the finite element model of the 9th group, please refer to Figure 3b ,like Figure 3b As shown, the spindle of the center-mounted planer-type boring and milling machine is located at the bottom, and the spindle overhang is 100%; In finite element analysis, the analysis step uses the general statics analysis step, opens the large geometric deformation, and the initial step length is 0.01; linear elastic statics analysis is often used to calculate the strength of the structure under a fixed load, and the displacement and stress distribution of the structure can be obtained. The equation of linear elastic statics is: , in, is a constant stiffness matrix and is continuous, is the displacement vector, is a fixed load; The boundary conditions of the center-mounted planer boring and milling machine are set. Based on multiple groups of finite element models and boundary conditions, the linear elastic statics is used to perform static analysis on the three-dimensional solid model of the center-mounted planer boring and milling machine with gravity load applied, and the stress distribution of the center-mounted planer boring and milling machine is obtained. The maximum stress of the center-mounted planer boring and milling machine is determined based on the stress distribution, and the yield strength of the boring and milling machine material is obtained. The safety factor of the center-mounted planer boring and milling machine is calculated based on the yield strength and maximum stress; the boring and milling machine is analyzed under the deadweight state, and the boring and milling machine is applied as a whole. Gravity load, its boundary conditions are: since the whole parts of the center-mounted planer boring and milling machine are rigidly connected, it is only necessary to constrain the bottom of the center-mounted planer boring and milling machine to limit its rotation and movement in the X, Y, and Z directions; linear elastic statics is used to perform static analysis on the three-dimensional solid model of the center-mounted planer boring and milling machine with gravity load applied, and the stress distribution of the center-mounted planer boring and milling machine is obtained, that is, gravity load is applied to 9 groups of finite element models to analyze the stress distribution of the boring and milling machine. The finite element analysis results under gravity load can be found in Figure 4 ,like Figure 4 As shown, the main body of the gantry is the main body of the boring and milling machine, and the overall material of the planer type boring and milling machine is HT300, with a Young's modulus of 130 Gpa and a density of 7300. , Poisson's ratio is 0.25, and the calculated model is analyzed. The maximum stress results of 9 groups of simulation calculations are shown in Table 1. Table 1

[0025] Through the calculated maximum stress results, it can be found that the maximum stress of the nine groups of finite element models under gravity load is relatively consistent, and the average maximum stress of the nine groups of models is 16.65 MPa. The load is mainly concentrated on the saddle and the connection between the saddle and the main body. Among them, the saddle is subjected to the largest load, and its loaded part is located at the inner corner of the saddle, with an average stress of 12 MPa. The connection between the saddle and the main body is less stressed, with an average stress of 8.9 MPa, and the main body is subjected to the smallest stress, with an average stress of 2.5 MPa. In addition, the equivalent stress of the nodes in most areas of the boring and milling machine is in the range of 0.0004 to 15 MPa. When the yield strength of the HT300 material is 300 MPa, the calculation formula of the safety factor is: , in, is the safety factor, is the yield strength of the boring and milling machine material, is the maximum stress. The calculated safety factor is 17.2, which shows that the safety factor of the boring and milling machine is above 17, indicating that the boring and milling machine has good strength under gravity load, that is, good stability.

[0026] In some embodiments, in step S103, a dynamic characteristic analysis is performed on the three-dimensional solid model of the center-mounted planer boring and milling machine, and the first six natural frequencies of the center-mounted planer boring and milling machine under a free vibration environment are calculated. Based on multiple sets of finite element models and boundary conditions, a dynamic characteristic analysis is performed on the three-dimensional solid model of the center-mounted planer boring and milling machine, and the natural frequencies of the center-mounted planer boring and milling machine under a free vibration environment are calculated. The first six natural frequencies of the center-mounted planer boring and milling machine are determined based on the natural frequencies. The dynamic characteristic analysis does not require the addition of force loads, and its boundary conditions are consistent with the boundary conditions in the static analysis. The bottom of the center-mounted planer boring and milling machine is constrained to limit its rotation and movement in the X, Y, and Z directions; under the constraints of the free vibration environment and boundary conditions, a dynamic characteristic analysis is performed. The dynamic characteristic analysis is used to obtain the natural frequency and vibration mode of the boring and milling machine structure under free vibration, so as to provide theoretical support for analyzing the vibration resistance of the structure. In the dynamic characteristic analysis, the calculation formula of the natural frequency and mode is: , in, is the stiffness matrix, is the mass matrix, For the The natural frequencies of the finite element model, is the frequency vector; Through dynamic characteristics analysis (modal analysis), the first six natural frequencies are extracted when the main shaft is at the top and the extension is 100%. For the first-order dynamic characteristics analysis result diagram when the main shaft is at the top and the extension is 100%, please refer to Figure 5a , the second-order dynamic characteristics analysis results are shown in Figure 2. Figure 5b , third-order dynamic characteristics analysis results diagram, please refer to Figure 5c , Four For a schematic diagram of the results of the first-order dynamic characteristics analysis, please refer to Figure 5d , fifth-order dynamic characteristics analysis results diagram, please refer to Figure 5e , please refer to the schematic diagram of the sixth-order dynamic characteristics analysis results Figure 5f , the results of the first six natural frequencies are shown in Table 2. Table 2

[0027] Its natural frequency is only related to the structure of the boring and milling machine. The external load has little effect on the natural frequency. Therefore, the influence of spindle rotation and load on the boring and milling machine is ignored. From the dynamic characteristics analysis results, it can be seen that the first-order natural frequency of the center-mounted planer boring and milling machine is only 13.71 Hz. Therefore, the external excitation frequency or the self-excitation frequency generated by the machine tool during the cutting process should be kept away from the natural frequency as much as possible to avoid resonance and affect the cutting accuracy. Modal analysis was performed on the boring and milling machine at different positions and extension lengths of 9 finite element models, and the first-order mode of each model was extracted. The results of the first-order modal analysis of the 9 positions are shown in Table 3. Table 3

[0028] When the spindle is at the bottom, its stability is the best. As the spindle rises, the first-order modal natural frequency gradually decreases, that is, it is more prone to vibration, and the extension length has a limited effect on the natural frequency of the boring and milling machine.

[0029] In order to better implement the dynamic analysis method of the center-mounted planer type boring and milling machine in the embodiment of the present invention, based on the dynamic analysis method of the center-mounted planer type boring and milling machine, correspondingly, Figure 6 As shown, the embodiment of the present invention further provides a dynamic analysis device for a center-mounted planer-type boring and milling machine, and the dynamic analysis device 600 for a center-mounted planer-type boring and milling machine includes: The boring and milling machine model building module 601 is used to build a three-dimensional solid model of a center-mounted planer-type boring and milling machine; The statics analysis module 602 is used to perform statics analysis on the three-dimensional solid model of the center-mounted planer-type boring and milling machine, obtain the stress distribution of the center-mounted planer-type boring and milling machine under gravity load, and calculate the safety factor of the center-mounted planer-type boring and milling machine based on the stress distribution; The dynamic characteristic analysis module 603 is used to perform dynamic characteristic analysis on the three-dimensional solid model of the center-mounted planer-type boring and milling machine, and calculate the first six natural frequencies of the center-mounted planer-type boring and milling machine under a free vibration environment.

[0030] like Figure 7 As shown, the present invention also provides an electronic device 700 , which can be a computing device such as a mobile terminal, a desktop computer, a notebook, a palmtop computer, a server, etc. The electronic device 700 includes a processor 701 , a memory 702 , and a display 703 . Figure 7 Only some components of the electronic device 700 are shown, but it should be understood that it is not required to implement all of the components shown, and more or fewer components may be implemented instead.

[0031] In some embodiments, the memory 702 may be an internal storage unit of the electronic device 700, such as a hard disk or memory of the electronic device 700. In other embodiments, the memory 702 may also be an external storage device of the electronic device 700, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the electronic device 700. Further, the memory 702 may also include both an internal storage unit of the electronic device 700 and an external storage device. The memory 702 is used to store application software and various data installed in the electronic device 700, such as program codes installed in the electronic device 700. The memory 702 may also be used to temporarily store data that has been output or is to be output. In one embodiment, a dynamic analysis program for a center-mounted planer-type boring and milling machine is stored on the memory 702, and the dynamic analysis program for a center-mounted planer-type boring and milling machine can be executed by the processor 701, thereby realizing the dynamic analysis method for a center-mounted planer-type boring and milling machine in each embodiment of the present invention.

[0032] In some embodiments, the processor 701 may be a central processing unit (CPU), a microprocessor or other data processing chip, used to run program codes or process data stored in the memory 702, such as a dynamic analysis method for a center-mounted planer-type boring and milling machine.

[0033] In some embodiments, the display 703 may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, an OLED (Organic Light-Emitting Diode) touch device, etc. The display 703 is used to display identification information of the center-mounted planer-type boring and milling machine dynamics analysis program and to display a visual user interface. The components 701-703 of the electronic device 700 communicate with each other via a system bus.

[0034] In some embodiments, when the processor 701 executes the dynamics analysis program of the center-mounted planer-type boring and milling machine in the memory 702, the various steps in the dynamics analysis method of the center-mounted planer-type boring and milling machine described in the above embodiments are implemented. Since the dynamics analysis method of the center-mounted planer-type boring and milling machine has been described in detail above, it will not be repeated here.

[0035] Accordingly, the present invention also provides a computer-readable storage medium, which is used to store computer-readable programs or instructions. When the program or instructions are executed by a processor, it can implement the steps or functions of the dynamic analysis method of the center-mounted planer table boring and milling machine provided in the above-mentioned method embodiments.

[0036] In summary, the present invention provides a dynamic analysis method, device, equipment and medium for a center-mounted planer table boring and milling machine, constructs a three-dimensional solid model of a center-mounted planer table boring and milling machine, performs static analysis on the three-dimensional solid model of the center-mounted planer table boring and milling machine, obtains the stress distribution of the center-mounted planer table boring and milling machine under gravity load, calculates the safety factor of the center-mounted planer table boring and milling machine based on the stress distribution, performs dynamic characteristic analysis on the three-dimensional solid model of the center-mounted planer table boring and milling machine, calculates the first six natural frequencies of the center-mounted planer table boring and milling machine under a free vibration environment, and improves the machining accuracy of the boring and milling machine.

[0037] Those skilled in the art will appreciate that all or part of the processes of the above-mentioned embodiments can be implemented by instructing related hardware through a computer program, and the program can be stored in a computer-readable storage medium, wherein the computer-readable storage medium is a disk, an optical disk, a read-only storage memory, or a random access memory, etc.

[0038] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A dynamic analysis method for a center-mounted planer-type boring and milling machine, characterized in that: include: Construct a 3D solid model of a center-mounted planer-type boring and milling machine; Performing static analysis on the three-dimensional solid model of the center-mounted planer-type boring and milling machine to obtain the stress distribution of the center-mounted planer-type boring and milling machine under gravity load, and calculating the safety factor of the center-mounted planer-type boring and milling machine based on the stress distribution; The dynamic characteristics of the three-dimensional solid model of the center-mounted planer-type boring and milling machine are analyzed, and the first six natural frequencies of the center-mounted planer-type boring and milling machine under a free vibration environment are calculated.

2. The method for dynamic analysis of a center-mounted planer-type boring and milling machine according to claim 1, characterized in that: The method of constructing a three-dimensional solid model of a center-mounted planer-type boring and milling machine includes: Determine the components of a center-mounted planer-type boring and milling machine, wherein the components at least include a column, a bed, a slide, a spindle box, a worktable, and a saddle, the column adopts a center-mounted double-layer six-guide structure, and the six guides are four-wire and two-hard composite guides; Establishing a three-dimensional solid model of the center-mounted planer-type boring and milling machine component, and obtaining the component properties of the center-mounted planer-type boring and milling machine, wherein the component properties include physical properties, material constitutive properties, friction equations, and dynamic properties; The three-dimensional solid model of the assembled center-mounted planer-type boring and milling machine components is imported into the finite element analysis software, and after the component attributes are assigned to the corresponding components, the components are simplified to generate the three-dimensional solid model of the center-mounted planer-type boring and milling machine.

3. The method for dynamic analysis of a center-mounted planer-type boring and milling machine according to claim 2, characterized in that: The simplification of the components comprises: The internal bearing, spacer and nut of the main shaft are simplified into hollow cylinders; The parts and structure of the saddle are simplified.

4. The method for dynamic analysis of a center-mounted planer-type boring and milling machine according to claim 2, characterized in that: The static analysis of the three-dimensional solid model of the center-mounted planer-type boring and milling machine is performed to obtain the stress distribution of the center-mounted planer-type boring and milling machine under gravity load, including: Based on the three-dimensional solid model of the center-mounted planer-type boring and milling machine, multiple groups of finite element models are established according to the spindle position and spindle overhang of the center-mounted planer-type boring and milling machine, wherein the spindle position includes the bottom, the middle and the top, and the spindle overhang includes the first spindle overhang, the second spindle overhang and the third spindle overhang; The boundary conditions of the center-mounted planer-type boring and milling machine are set, and based on the multiple sets of finite element models and boundary conditions, linear elastic statics are used to perform static analysis on the three-dimensional solid model of the center-mounted planer-type boring and milling machine with a gravity load applied to obtain the stress distribution of the center-mounted planer-type boring and milling machine.

5. The method for dynamic analysis of a center-mounted planer-type boring and milling machine according to claim 4, characterized in that: The safety factor of the center-mounted planer-type boring and milling machine is calculated based on the stress distribution, including: Determining the maximum stress of the center-mounted planer-type boring and milling machine based on the stress distribution; The yield strength of the material of the center-mounted planer-type boring and milling machine is obtained, and the safety factor of the center-mounted planer-type boring and milling machine is calculated based on the yield strength and the maximum stress.

6. The method for dynamic analysis of a center-mounted planer-type boring and milling machine according to claim 5, characterized in that: The dynamic characteristics analysis of the three-dimensional solid model of the center-mounted planer type boring and milling machine is performed to calculate the first six natural frequencies of the center-mounted planer type boring and milling machine under a free vibration environment, including: Based on the multiple sets of finite element models and boundary conditions, the dynamic characteristics of the three-dimensional solid model of the center-mounted planer table boring and milling machine are analyzed, the natural frequency of the center-mounted planer table boring and milling machine under a free vibration environment is calculated, and the first six natural frequencies of the center-mounted planer table boring and milling machine are determined based on the natural frequency.

7. The method for dynamic analysis of a center-mounted planer-type boring and milling machine according to claim 6, characterized in that: The calculation formula of the safety factor is: ， in, is the safety factor, is the yield strength of boring and milling machine materials, is the maximum stress; The calculation formula of the natural frequency is: ， in, is the stiffness matrix, is the mass matrix, For the The natural frequencies of the finite element model, is the frequency vector.

8. A dynamic analysis device for a center-mounted planer-type boring and milling machine, characterized in that: include: The boring and milling machine model building module is used to build a 3D solid model of a center-mounted planer-type boring and milling machine; A statics analysis module, used for performing statics analysis on the three-dimensional solid model of the center-mounted planer-type boring and milling machine, obtaining the stress distribution of the center-mounted planer-type boring and milling machine under gravity load, and calculating the safety factor of the center-mounted planer-type boring and milling machine based on the stress distribution; The dynamic characteristic analysis module is used to perform dynamic characteristic analysis on the three-dimensional solid model of the center-mounted planer-type boring and milling machine, and calculate the first six natural frequencies of the center-mounted planer-type boring and milling machine under a free vibration environment.

9. An electronic device, characterized in that: including memory and processor; The memory stores a computer-readable program executable by the processor; When the processor executes the computer-readable program, the processor implements the steps in the dynamic analysis method of a center-mounted planer-type boring and milling machine as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores one or more programs, and the one or more programs can be executed by one or more processors to implement the steps in the dynamic analysis method of a center-mounted planer-type boring and milling machine as described in any one of claims 1-7.

Images