Machine tool digital twinning performance evaluation method and system

Abstract

The invention discloses a machine tool digital twinning performance evaluation method and system, and the method specifically comprises the following steps: S1, obtaining the parameters of all parts of a machine tool, and building a geometric model, a mechanical kinematics model, a mechanical structure rigid-flexible coupling model and an electromechanical coupling model based on a machine tool drawing; s2, all the models in the step S1 are combined, and then a digital twin model of the numerical control machine tool is obtained; and S3, packaging the constructed machine tool digital twin model, and transmitting the collected machine tool spindle information to the machine tool spindle digital twin model. According to the machine tool digital twinning performance evaluation method and system, automatic comparison evaluation of the numerical control machine tool is realized by establishing a complete evaluation index system, a to-be-evaluated item can be determined, the evaluation precision is higher, the efficiency is higher, and the evaluation result can be visually obtained to judge the machine tool performance.

Description

Technical Field

[0001] The present invention relates to the technical field of CNC machine tools, and specifically to a method and system for evaluating the performance of a digital twin of a machine tool. Background Art

[0002] CNC machine tools are the "working mother machines" of the equipment manufacturing industry, and their processing level directly affects the level of the manufacturing industry. As a key functional component of CNC machine tools, the processing performance of the machine tool spindle directly affects the accuracy retention, stability and reliability of CNC machine tools. The machine tool spindle is a complex electromechanical product coupled by multiple subsystems, involving multiple fields such as mechanics, electrical, control, and heat transfer, and has the characteristics of multivariable, nonlinear, and strong coupling. During the operation of CNC machine tools, the quality of the spindle components and the assembly of the entire CNC machine tool directly affects the performance parameters of the spindle, such as vibration, temperature, and stiffness, thereby affecting the durability and life of the spindle. Therefore, performance evaluation of the machine tool spindle and real-time monitoring of the spindle health status are of great significance to improving the processing efficiency of CNC machine tools and extending the service life of machine tools.

[0003] Nowadays, in order to complete a comprehensive, effective and accurate performance evaluation of machine tool spindles, we must first establish a machine tool spindle performance evaluation index system, clarify the items to be evaluated, and then evaluate the machine tool performance. The existing evaluation methods mostly use manual evaluation when evaluating the performance of various machine tool parts, which has low evaluation efficiency and low accuracy.

[0004] Therefore, the present invention proposes a machine tool digital twin performance evaluation method and system to solve the above-mentioned problems. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a machine tool digital twin performance evaluation method and system, which solves the problems mentioned in the above background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a machine tool digital twin performance evaluation method, specifically comprising the following steps:

[0007] S1. Obtain the parameters of each part of the machine tool, and establish a geometric model, a mechanical kinematics model, a mechanical structure rigid-flexible coupling model, and an electromechanical coupling model based on the machine tool drawings;

[0008] S2, combining the models in step S1, and then obtaining a digital twin model of the CNC machine tool;

[0009] S3. Encapsulate the constructed machine tool digital twin model by transmitting the collected machine tool spindle information to the machine tool spindle digital twin model;

[0010] S4. Build an evaluation index system to evaluate the digital twin model;

[0011] S5. Optimize the digital twin model, use the optimized digital twin model to simulate the machine tool processing process, collect data such as processing vibration, and determine whether the processing quality meets the processing requirements.

[0012] The present invention also discloses a machine tool digital twin performance evaluation system, including a model input unit, a data processing unit, a model identification unit, a model evaluation unit, a loading unit, a display unit, a model classification unit, a data feedback unit, and a data storage unit.

[0013] Preferably, the output end of the model input unit is connected to the input end of the data processing unit, the output end of the data processing unit is connected to the input end of the model identification unit, the output end of the model identification unit is connected to the input end of the model evaluation unit, the output end of the model evaluation unit is connected to the input end of the loading unit, and the output end of the loading unit is connected to the input end of the display unit.

[0014] Preferably, the display unit includes a mechanical structure rigid-flexible coupling module, a geometric model display module, a mechanical kinematics module, an electromechanical coupling module, a summary display module, a pre-generation module, and a classification display module.

[0015] Preferably, the output end of the mechanical structure rigid-flexible coupling module is connected to the input end of the summary display module, the output end of the geometric model display module is connected to the input end of the summary display module, the output end of the mechanical kinematics module is connected to the input end of the summary display module, and the output end of the electromechanical coupling module is connected to the input end of the summary display module.

[0016] Preferably, the output end of the summary display module is connected to the input end of the pre-generation module, and the output end of the pre-generation module is connected to the input end of the classification display module.

[0017] Preferably, the input end of the model classification unit is connected to the output end of the model identification unit, the input end of the data feedback unit is connected to the output end of the model classification unit, the output end of the data feedback unit is connected to the input end of the data processing unit, and the output end of the data processing unit is connected to the input end of the data storage unit.

[0018] Preferably, the model evaluation unit includes a vibration simulation module, a signal receiving module, a vibration output module, and a reference comparison module.

[0019] Preferably, the output end of the simulated vibration module is connected to the input end of the signal receiving module, the output end of the signal receiving module is connected to the input end of the vibration output module, and the output end of the vibration output module is connected to the input end of the reference comparison module.

[0020] Beneficial Effects

[0021] The present invention provides a method and system for evaluating the performance of a machine tool digital twin. Compared with the prior art, it has the following beneficial effects:

[0022] This machine tool digital twin performance evaluation method and system, by establishing a complete evaluation index system, can realize automated comparative evaluation of CNC machine tools, clearly identify the items to be evaluated, make the evaluation more accurate and efficient, and intuitively draw evaluation results to judge machine tool performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a system principle block diagram of the present invention;

[0024] Figure 2 is a principle block diagram of a display unit of the present invention;

[0025] Figure 3 It is a logic judgment block diagram of the present invention;

[0026] Figure 4 It is a principle block diagram of the model evaluation unit of the present invention.

[0027] In the figure: 1-model input unit, 2-data processing unit, 3-model identification unit, 4-model evaluation unit, 41-simulated vibration module, 42-signal receiving module, 43-vibration output module, 44-reference comparison module, 5-loading unit, 6-display unit, 61-mechanical structure rigid-flexible coupling module, 62-geometric model display module, 63-mechanical kinematics module, 64-electromechanical coupling module, 65-summary display module, 66-pre-generation module, 67-classification display module, 7-model classification unit, 8-data feedback unit, 9-data storage unit. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] See also Figure 1-4 The present invention provides two technical solutions: specifically including the following embodiments:

[0030] Example 1

[0031] The machine tool digital twin performance evaluation method specifically includes the following steps:

[0032] S1. Obtain the parameters of each part of the machine tool, and establish a geometric model, a mechanical kinematics model, a mechanical structure rigid-flexible coupling model, and an electromechanical coupling model based on the machine tool drawings;

[0033] S2, combining the models in step S1, and then obtaining a digital twin model of the CNC machine tool;

[0034] S3. Encapsulate the constructed machine tool digital twin model by transmitting the collected machine tool spindle information to the machine tool spindle digital twin model;

[0035] S4. Build an evaluation index system to evaluate the digital twin model;

[0036] S5. Optimize the digital twin model, use the optimized digital twin model to simulate the machine tool processing process, collect data such as processing vibration, and determine whether the processing quality meets the processing requirements.

[0037] The present invention also discloses a machine tool digital twin performance evaluation system, including a model input unit 1, a data processing unit 2, a model identification unit 3, a model evaluation unit 4, a loading unit 5, a display unit 6, a model classification unit 7, a data feedback unit 8, and a data storage unit 9. The data storage unit 9 is used to store model information and maintain various types of data. The model identification unit 3 is used to identify various types of models and evaluate them through the model evaluation unit 4. The display unit 6 is used to display the final evaluation result. Figure 3 As shown, the evaluation mark is loaded first, and then the evaluation mark is produced, and a comparison is made through the evaluation results. If the evaluation meets the standard, the process ends. If the evaluation does not meet the standard, a second evaluation is performed.

[0038] In the embodiment of the present invention, the output end of the model input unit 1 is connected to the input end of the data processing unit 2, the output end of the data processing unit 2 is connected to the input end of the model identification unit 3, the output end of the model identification unit 3 is connected to the input end of the model evaluation unit 4, the output end of the model evaluation unit 4 is connected to the input end of the loading unit 5, the output end of the loading unit 5 is connected to the input end of the display unit 6, the input end of the model classification unit 7 is connected to the output end of the model identification unit 3, the input end of the data feedback unit 8 is connected to the output end of the model classification unit 7, the output end of the data feedback unit 8 is connected to the input end of the data processing unit 2, and the output end of the data processing unit 2 is connected to the input end of the data storage unit 9.

[0039] In the embodiment of the present invention, the display unit 6 includes a mechanical structure rigid-flexible coupling module 61, a geometric model display module 62, a mechanical kinematics module 63, an electromechanical coupling module 64, a summary display module 65, a pre-generation module 66, and a classification display module 67. The mechanical structure rigid-flexible coupling module 61, the geometric model display module 62, the mechanical kinematics module 63, and the electromechanical coupling module 64 are used to display the rigidity and flexibility of the mechanical structure, the overall model display, the motion state display, and the electromechanical coupling display, respectively.

[0040] In an embodiment of the present invention, the output end of the mechanical structure rigid-flexible coupling module 61 is connected to the input end of the summary display module 65, the output end of the geometric model display module 62 is connected to the input end of the summary display module 65, the output end of the mechanical kinematics module 63 is connected to the input end of the summary display module 65, the output end of the electromechanical coupling module 64 is connected to the input end of the summary display module 65, the output end of the summary display module 65 is connected to the input end of the pre-generation module 66, and the output end of the pre-generation module 66 is connected to the input end of the classification display module 67.

[0041] In the embodiment of the present invention, the model evaluation unit 4 includes a simulation vibration module 41, a signal receiving module 42, a vibration output module 43, and a reference comparison module 44. The output end of the simulation vibration module 41 is connected to the input end of the signal receiving module 42, the output end of the signal receiving module 42 is connected to the input end of the vibration output module 43, and the output end of the vibration output module 43 is connected to the input end of the reference comparison module 44. The vibration state of the machine tool during operation can be simulated by the simulation vibration module 41, the vibration information is received by the signal receiving module 42, and the vibration information is compared with the standardized machine tool information by the reference comparison module 44.

[0042] Example 2

[0043] The machine tool digital twin performance evaluation method specifically includes the following steps:

[0044] S1. Obtain the parameters of each part of the machine tool, and establish a geometric model, a mechanical kinematics model, a mechanical structure rigid-flexible coupling model, and an electromechanical coupling model based on the machine tool drawings;

[0045] S2, combining the models in step S1, and then obtaining a digital twin model of the CNC machine tool;

[0046] S3. Encapsulate the constructed machine tool digital twin model by transmitting the collected machine tool spindle information to the machine tool spindle digital twin model;

[0047] S4. Build an evaluation index system to evaluate the digital twin model;

[0048] S5. Optimize the digital twin model, use the optimized digital twin model to simulate the machine tool processing process, collect data such as processing vibration, and determine whether the processing quality meets the processing requirements.

[0049] The present invention also discloses a machine tool digital twin performance evaluation system, including a model input unit 1, a data processing unit 2, a model identification unit 3, a model evaluation unit 4, a loading unit 5, a display unit 6, a model classification unit 7, a data feedback unit 8, and a data storage unit 9. The data storage unit 9 is used to store model information and maintain various types of data. The model identification unit 3 is used to identify various types of models and evaluate them through the model evaluation unit 4. The display unit 6 is used to display the final evaluation results.

[0050] In the embodiment of the present invention, the output end of the model input unit 1 is connected to the input end of the data processing unit 2, the output end of the data processing unit 2 is connected to the input end of the model identification unit 3, the output end of the model identification unit 3 is connected to the input end of the model evaluation unit 4, the output end of the model evaluation unit 4 is connected to the input end of the loading unit 5, the output end of the loading unit 5 is connected to the input end of the display unit 6, the input end of the model classification unit 7 is connected to the output end of the model identification unit 3, the input end of the data feedback unit 8 is connected to the output end of the model classification unit 7, the output end of the data feedback unit 8 is connected to the input end of the data processing unit 2, and the output end of the data processing unit 2 is connected to the input end of the data storage unit 9.

[0051] In the embodiment of the present invention, the display unit 6 includes a mechanical structure rigid-flexible coupling module 61, a geometric model display module 62, a mechanical kinematics module 63, an electromechanical coupling module 64, a summary display module 65, a pre-generation module 66, and a classification display module 67. The mechanical structure rigid-flexible coupling module 61, the geometric model display module 62, the mechanical kinematics module 63, and the electromechanical coupling module 64 are used to display the rigidity and flexibility of the mechanical structure, the overall model display, the motion state display, and the electromechanical coupling display, respectively.

[0052] In an embodiment of the present invention, the output end of the mechanical structure rigid-flexible coupling module 61 is connected to the input end of the summary display module 65, the output end of the geometric model display module 62 is connected to the input end of the summary display module 65, the output end of the mechanical kinematics module 63 is connected to the input end of the summary display module 65, the output end of the electromechanical coupling module 64 is connected to the input end of the summary display module 65, the output end of the summary display module 65 is connected to the input end of the pre-generation module 66, and the output end of the pre-generation module 66 is connected to the input end of the classification display module 67.

[0053] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0054] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0055] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A machine tool digital twin performance evaluation method, characterized by: The specific steps include: S1. Obtain the parameters of each part of the machine tool, and establish a geometric model, a mechanical kinematics model, a mechanical structure rigid-flexible coupling model, and an electromechanical coupling model based on the machine tool drawings; S2, combining the models in step S1, and then obtaining a digital twin model of the CNC machine tool; S3. Encapsulate the constructed machine tool digital twin model by transmitting the collected machine tool spindle information to the machine tool spindle digital twin model; S4. Build an evaluation index system to evaluate the digital twin model; S5. Optimize the digital twin model, use the optimized digital twin model to simulate the machine tool processing process, collect data such as processing vibration, and determine whether the processing quality meets the processing requirements.

2. A machine tool digital twin performance evaluation system, characterized in that: The invention comprises a model input unit (1), a data processing unit (2), a model identification unit (3), a model evaluation unit (4), a loading unit (5), a display unit (6), a model classification unit (7), a data feedback unit (8), and a data storage unit (9).

3. The machine tool digital twin performance evaluation system according to claim 2, characterized in that: The output end of the model input unit (1) is connected to the input end of the data processing unit (2), the output end of the data processing unit (2) is connected to the input end of the model identification unit (3), the output end of the model identification unit (3) is connected to the input end of the model evaluation unit (4), the output end of the model evaluation unit (4) is connected to the input end of the loading unit (5), and the output end of the loading unit (5) is connected to the input end of the display unit (6).

4. The machine tool digital twin performance evaluation system according to claim 1, characterized in that: The display unit (6) comprises a mechanical structure rigid-flexible coupling module (61), a geometric model display module (62), a mechanical kinematics module (63), an electromechanical coupling module (64), a summary display module (65), a pre-generation module (66), and a classification display module (67).

5. The machine tool digital twin performance evaluation system according to claim 4, characterized in that: The output end of the mechanical structure rigid-flexible coupling module (61) is connected to the input end of the summary display module (65), the output end of the geometric model display module (62) is connected to the input end of the summary display module (65), the output end of the mechanical kinematics module (63) is connected to the input end of the summary display module (65), and the output end of the electromechanical coupling module (64) is connected to the input end of the summary display module (65).

6. The machine tool digital twin performance evaluation system according to claim 5, characterized in that: The output end of the summary display module (65) is connected to the input end of the pre-generation module (66), and the output end of the pre-generation module (66) is connected to the input end of the classification display module (67).

7. The machine tool digital twin performance evaluation system according to claim 2, characterized in that: The input end of the model classification unit (7) is connected to the output end of the model identification unit (3), the input end of the data feedback unit (8) is connected to the output end of the model classification unit (7), the output end of the data feedback unit (8) is connected to the input end of the data processing unit (2), and the output end of the data processing unit (2) is connected to the input end of the data storage unit (9).

8. The machine tool digital twin performance evaluation system according to claim 2, characterized in that: The model evaluation unit (4) comprises a vibration simulation module (41), a signal receiving module (42), a vibration output module (43), and a reference comparison module (44).

9. The machine tool digital twin performance evaluation system according to claim 8, characterized in that: The output end of the simulated vibration module (41) is connected to the input end of the signal receiving module (42), the output end of the signal receiving module (42) is connected to the input end of the vibration output module (43), and the output end of the vibration output module (43) is connected to the input end of the reference comparison module (44).

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