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CN-121980693-A - Screw assembly connection process parameter optimization method and monitoring device based on accurate digital twin

CN121980693ACN 121980693 ACN121980693 ACN 121980693ACN-121980693-A

Abstract

The application discloses a screw assembly connection process parameter optimization method and a monitoring device based on accurate digital twinning, and relates to the field of intelligent manufacturing. The method comprises the steps of constructing a geometric distribution error model of a thread assembly contact surface based on thread assembly contact surface point cloud data, integrating the geometric distribution error model of the thread assembly contact surface with an assembled three-dimensional model to obtain a solid model with three-dimensional geometric errors, constructing a bolt three-dimensional model with three-dimensional geometric distribution errors based on bolt point cloud data, virtually assembling the two solid models and the bolt three-dimensional model to obtain an accurate geometric digital twin model of a thread assembly connection structure, bringing physical condition data into the accurate geometric digital twin model to obtain an accurate physical digital twin model, and optimizing thread assembly connection process parameters by taking the accuracy and performance of a physical system after thread fastening as optimization targets. The application can improve the accuracy of the technological parameters of the screw assembly connection and obtain a high-precision and high-performance product.

Inventors

  • ZHANG ZHIJING

Assignees

  • 张之敬

Dates

Publication Date
20260505
Application Date
20251210

Claims (10)

  1. 1. The method for optimizing the process parameters of the screw assembly connection based on accurate digital twinning is characterized by comprising the following steps of: Acquiring point cloud data of a contact surface of the screw assembly and point cloud data of a bolt; Constructing a geometric distribution error model of the thread assembly contact surface based on the thread assembly contact surface point cloud data; Integrating the geometric distribution error model with the assembled three-dimensional model to obtain a three-dimensional entity model with three-dimensional geometric errors; constructing a three-dimensional bolt model with three-dimensional geometric distribution errors based on the bolt point cloud data; Virtually assembling the two three-dimensional solid models and the three-dimensional bolt model to obtain an accurate geometric digital twin model of the virtually assembled threaded assembly connection structure; The physical condition data is brought into the precise geometric digital twin model to obtain the precise physical digital twin model of the screw thread assembly connection structure, wherein the physical condition data comprises static and dynamic environment data, material data and nonlinear characteristic data; Adopting the accurate physical digital twin model, and optimizing the screw assembly connection process parameters by taking the accuracy and the performance of the physical system after screw fastening as optimization targets to obtain the optimal screw assembly connection process parameters; The method comprises the steps of connecting a physical system with a screw thread, wherein the spatial position and the gesture of a assembled part in the physical system after screw thread fastening represent the precision of the physical system, the uniformity of the maximum stress and stress distribution in the physical system after screw thread fastening represents the performance of the physical system, and the screw thread assembling and connecting process parameters comprise screw thread fastening force and screwing sequence.
  2. 2. The method for optimizing the process parameters of the screw fitting connection based on accurate digital twinning according to claim 1, wherein the method for constructing the geometric distribution error model of the screw fitting contact surface based on the screw fitting contact surface point cloud data specifically comprises the following steps: And constructing a geometric distribution error model of the thread assembly contact surface by adopting a surface fitting method according to the thread assembly contact surface point cloud data.
  3. 3. The method for optimizing the process parameters of the screw thread assembly connection based on the precise digital twin according to claim 1, wherein the two three-dimensional solid models and the three-dimensional bolt model are virtually assembled to obtain the precise geometric digital twin model of the screw thread assembly connection structure after virtual assembly, specifically comprising the following steps: virtually assembling the two three-dimensional solid models by adopting a three-point solving algorithm for enabling assembling resultant force to be in a triangle to obtain a virtually assembled three-dimensional solid model, wherein the triangle is formed by three contact points determined according to the minimum contact distance of the contact surfaces of the two three-dimensional solid models; And virtually assembling the virtually assembled three-dimensional entity model and the bolt three-dimensional model to obtain the precise geometric digital twin model of the virtually assembled screw thread assembly connection structure.
  4. 4. The method for optimizing the process parameters of the screw assembly connection based on the precise digital twin according to claim 1, wherein the precise physical digital twin model is adopted, the precision and the performance of a physical system after screw tightening are used as optimization targets, the process parameters of the screw assembly connection are optimized, and the optimum process parameters of the screw assembly connection are obtained, and the method specifically comprises the following steps: and the accurate physical digital twin model is adopted, the spatial position and the attitude of the assembly part determined by a user according to design and technology are used as constraint targets of accuracy, 60% -70% of the yield limit of the material is used as constraint targets of maximum stress, the uniformity requirement of stress distribution is used as constraint targets of stress distribution uniformity, and the process parameters of the threaded assembly connection are optimized, so that the optimal process parameters of the threaded assembly connection are obtained.
  5. 5. The method for optimizing the process parameters of the screw thread assembly connection based on the precise digital twin is characterized in that the static and dynamic environment data comprise temperature, load and assembly force, the material data comprise data of various material parameters in a screw thread assembly connection structure, the material parameters comprise elastic modulus, poisson's ratio and coefficient of linear expansion, and the nonlinear characteristic data comprise physical system internal stress relaxation data, structure creep data and friction data.
  6. 6. The method for optimizing threaded make-up connection process parameters based on accurate digital twinning according to claim 1, wherein after obtaining the optimal threaded make-up connection process parameters, the method for optimizing threaded make-up connection process parameters based on accurate digital twinning further comprises: and determining the number of screw threads and the diameter of the screw threads for fastening the screw assembly according to the screw fastening force in the optimal screw assembly connection process parameters.
  7. 7. The device is characterized by comprising a thread assembly process data integration processing computer system and an intelligent screwing process position and sequence real-time monitoring device, wherein a real-time data transmission function is provided between the thread assembly process data integration processing computer system and the intelligent screwing process position and sequence real-time monitoring device; the thread make-up process data integration processing computer system includes: the data acquisition module is used for acquiring the point cloud data of the contact surface of the screw assembly and the point cloud data of the bolt; The geometric distribution error model construction module is used for constructing a geometric distribution error model of the thread assembly contact surface based on the thread assembly contact surface point cloud data; The three-dimensional model integration module is used for integrating the geometric distribution error model with the assembled three-dimensional model to obtain a three-dimensional entity model with three-dimensional geometric errors; The bolt three-dimensional model construction module is used for constructing a bolt three-dimensional model with three-dimensional geometric distribution errors based on the bolt point cloud data; The virtual assembly module is used for virtually assembling the two three-dimensional entity models and the three-dimensional bolt model to obtain an accurate geometric digital twin model of the virtually assembled threaded assembly connection structure; The accurate physical digital twin model construction module is used for bringing physical condition data into the accurate geometric digital twin model to obtain an accurate physical digital twin model of the screw thread assembly connection structure, wherein the physical condition data comprises static and dynamic environment data, material data and nonlinear characteristic data; the parameter optimization module is used for optimizing the screw assembly connection process parameters by adopting the accurate physical digital twin model and taking the accuracy and the performance of the physical system after screw tightening as optimization targets to obtain the optimal screw assembly connection process parameters; The method comprises the steps of connecting a physical system with a screw thread, wherein the spatial position and the gesture of a assembled part in the physical system after screw thread fastening represent the precision of the physical system, and the uniformity of the maximum stress and stress distribution in the physical system after screw thread fastening represents the performance of the physical system; The data transmission module is used for sending the optimal screw assembly connection process parameters to the intelligent tightening process position and sequence real-time monitoring device, and simultaneously receiving feedback data of the intelligent tightening process position and sequence execution result in real time; the intelligent tightening process position and sequence real-time monitoring device is used for performing real-object assembly according to the optimal screw assembly connection process parameters.
  8. 8. The device for monitoring the position and the sequence of the thread assembly process in real time according to claim 7, wherein the device for monitoring the position and the sequence of the intelligent tightening process comprises an intelligent tightening tool, a tightening position indication laser emitting device, a tool position indication laser emitting device and a monitoring system, wherein the thread assembly process data integration processing computer system further comprises a control module, and the monitoring system and the intelligent tightening tool are connected with the control module; The intelligent screwing tool comprises a screwing position indication laser emitting device, a monitoring system and a control module, wherein the screwing position indication laser emitting device is used for emitting first indication laser to indicate a screwed hole on a assembled part, the tool position indication laser emitting device is used for emitting second indication laser to indicate the position of the intelligent screwing tool, the intelligent screwing tool is used for determining the screwing position according to the first indication laser, the monitoring system is used for determining whether the intelligent screwing tool is at the screwing position according to the second indication laser, and the control module is used for controlling the intelligent screwing tool to carry out real object assembly according to optimal screw assembly connection technological parameters when the intelligent screwing tool is at the screwing position.
  9. 9. The thread assembly process position and sequence real-time monitoring device according to claim 8, wherein the monitoring system comprises a camera and a reflecting surface, wherein the camera is connected with the control module; the intelligent screwing tool comprises an intelligent screwing tool body, a reflecting surface, a camera and a camera, wherein the intelligent screwing tool body is provided with a first indicating laser, the reflecting surface is arranged on the intelligent screwing tool, the reflecting surface is used for receiving the second indicating laser, and the camera is used for capturing light spots generated on the reflecting surface when the second indicating laser irradiates the reflecting surface and determining that the intelligent screwing tool is at a screwing position when the light spots are captured.
  10. 10. The thread make-up process position and sequence real-time monitoring device of claim 8, wherein the monitoring system comprises a sensor, wherein the sensor is connected with the control module; The sensor is used for detecting the laser energy of the second indicating laser, and when the laser energy is detected, the intelligent tightening tool is determined to be at the tightening position.

Description

Screw assembly connection process parameter optimization method and monitoring device based on accurate digital twin Technical Field The application relates to the field of intelligent manufacturing, in particular to a method for optimizing screw assembly connection process parameters based on accurate digital twinning and a monitoring device. Background Threaded connections are one of the most widely used connection methods in the assembly of electromechanical products. The screw assembly connection process parameters such as screw tightening force, tightening connection sequence and the like are optimized, and the control method is a key process technology for ensuring the precision and performance of products. The precision of the electromechanical product refers to the geometric position and the dimensional precision of key parts in a static state or a moving state after the product is assembled. The electromechanical product performance refers to various characteristics of the product, such as motion characteristics, mechanical characteristics and the like, which meet the design function requirements of the product. For precision electromechanical products, the stability of precision and performance, i.e., the variation (particularly deterioration) of precision and performance with time, temperature, and environment. For electromechanical products of threaded connection assembly, precision and performance and stability of precision and performance are main indexes for measuring quality level of the electromechanical products at home and abroad, and the threaded connection process in the assembly process is a main factor for influencing the indexes. It is generally accepted in the art that 60% -70% of product accuracy and performance is determined by the level of assembly technology. For the screw assembly connection process, the screw fastening process of most instruments is determined by experience and feel of workers, and the precision and performance of the obtained product are required to be improved. In addition, an ideal three-dimensional design model is adopted to calculate the screw assembly connection process parameters (such as screw tightening force) through finite elements, and the screw assembly connection process parameters calculated according to the mode are used for guiding the screw assembly connection process, so that the errors between the actual precision and performance of the obtained product and the design target are large. Therefore, how to optimize the technological parameters of the threaded assembly connection so as to obtain a high-precision and high-performance product is called as a problem to be solved urgently at present. Disclosure of Invention The application aims to provide an accurate digital twin-based thread assembly connection process parameter optimization method and a monitoring device, which can improve the accuracy of the thread assembly connection process parameter, thereby obtaining a high-precision high-performance product. In order to achieve the above object, the present application provides the following solutions: In a first aspect, the application provides a method for optimizing process parameters of screw assembly connection based on accurate digital twinning, which comprises the following steps: Acquiring point cloud data of a contact surface of the screw assembly and point cloud data of a bolt; Constructing a geometric distribution error model of the thread assembly contact surface based on the thread assembly contact surface point cloud data; Integrating the geometric distribution error model with the assembled three-dimensional model to obtain a three-dimensional entity model with three-dimensional geometric errors; constructing a three-dimensional bolt model with three-dimensional geometric distribution errors based on the bolt point cloud data; Virtually assembling the two three-dimensional solid models and the three-dimensional bolt model to obtain an accurate geometric digital twin model of the virtually assembled threaded assembly connection structure; The physical condition data is brought into the precise geometric digital twin model to obtain the precise physical digital twin model of the screw thread assembly connection structure, wherein the physical condition data comprises static and dynamic environment data, material data and nonlinear characteristic data; Adopting the accurate physical digital twin model, and optimizing the screw assembly connection process parameters by taking the accuracy and the performance of the physical system after screw fastening as optimization targets to obtain the optimal screw assembly connection process parameters; The method comprises the steps of connecting a physical system with a screw thread, wherein the spatial position and the gesture of a assembled part in the physical system after screw thread fastening represent the precision of the physical system, the uniformity of the maximum stress and st