A method for analyzing interference risk between fasteners and working heads

Abstract

The present invention mainly relates to the technical field of structural part simulation. The present invention provides an interference risk analysis method between fasteners and working heads, simulates the possible interference between the working head and the fasteners, and avoids the quality problems caused by the interference of fasteners in the first production link due to the interference between the working head and the fasteners. The core idea is: cut the fasteners after extrusion molding, measure the assembly parameters of the fasteners, and establish a three-dimensional model of the fasteners based on the measured assembly parameters of the fasteners; simulate the installation of the fastener three-dimensional model established based on the connector according to the process digital model and the assembly parts; simulate the interference risk of the fasteners and the assembly parts according to the set offline CNC program, simulation elements and interference analysis requirements, and adjust the path in advance to avoid interference, which can avoid the quality problems caused by the interference between the working head and the fasteners in the first production link.

Description

Technical Field

[0001] The invention mainly relates to the technical field of structural component simulation, and in particular to an interference risk analysis method between a fastener and a working head. Background Art

[0002] Automatic drilling and riveting refers to the process of using an automatic drilling and riveting machine to complete the process of hole countersinking, glue injection, inserting connectors or installing connectors on pre-connected parts; the automatic drilling and riveting machine is mainly used in the manufacture of aviation and aerospace parts. The equipment uses machines to complete the process of hole making and installing connectors that could only be done manually. In the offline programming simulation based on digital models, programmers set the riveting sequence, riveting area, riveting parameters and riveting environment according to the set three-dimensional digital model to complete the simulation and generate the NC program. NC program compilation requires comprehensive consideration of product design and manufacturing requirements, process planning, interference collision, logical motion instructions and other issues to improve the quality and efficiency of program compilation. Taking the assembly of aircraft wall panels as an example, there are many frame and beam structures. When planning and simulating the offline programming process path, the interference risk between each component must be considered. However, the current offline programming process path and simulation mainly consider the interference between components, equipment working heads, brackets, and process equipment, but lack the interference analysis between the working head and fasteners. The interference between the working head and fasteners can only be discovered in the production link. Summary of the invention

[0003] Technical Problems to be Solved by the Invention

[0004] A method for analyzing the interference risk between fasteners and working heads is provided to simulate the possible interference between the working heads and fasteners, so as to avoid quality problems caused by fastener interference in the first piece production process due to the interference between the working heads and fasteners.

[0005] The technical solution adopted by the present invention to solve the above technical problems

[0006] A method for analyzing interference risk between a fastener and a working head, comprising:

[0007] cutting the fastener after extrusion forming, measuring assembly parameters of the fastener, and establishing a three-dimensional model of the fastener based on the measured assembly parameters of the fastener;

[0008] The three-dimensional model of the fastener established based on the connector is simulated and installed according to the process digital model and assembly parts;

[0009] According to the set offline NC program, simulation elements and interference analysis requirements, the interference risk of fasteners and assembly parts can be simulated.

[0010] Furthermore, when establishing the fastener three-dimensional model, the three-dimensional models of different types of fasteners are distinguished by different colors.

[0011] Furthermore, the set off-line numerical control program specifically includes the selection of fastener types, the installation sequence of fasteners, the working position of the working head of the equipment, the motion control of the equipment and the selection of equipment functions.

[0012] Furthermore, the simulation elements include simulating the wall panel assembly processing equipment after the fasteners are installed, the working head on the bracket and the equipment, and the wall panel assembly processing equipment after the fasteners are installed, and the working head under the wall panel and the equipment.

[0013] Furthermore, the interference analysis requirements are specifically as follows: during the entire process of simulating the physical movement and fastener installation with the program, not only does the upper working head of the equipment not have interference, but also the lower working head of the equipment does not have interference collision.

[0014] Beneficial Effects of the Invention

[0015] The interference risk analysis method of a fastener and a working head described in the present invention is to avoid the interference risk between the fastener and the working head in the production process in advance. The fastener after riveting is cut to measure the actual assembly molding parameters, and three-dimensional software is used to complete the modeling. The fastener is simulated and assembled based on the established three-dimensional model of the fastener. The interference risk situation of the fastener and the assembly is simulated according to the set offline CNC program, simulation elements and interference analysis requirements to directly judge whether there is interference in the riveting path or the working head angle adjustment. The path is adjusted in advance to avoid interference, which can avoid quality problems caused by the interference between the working head and the fastener in the first production link. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is the offline programming simulation effect diagram. DETAILED DESCRIPTION

[0017] Due to the extrusion forming process of fasteners such as aircraft rivets before and after installation, there are size differences in the fasteners installed on each device. Therefore, the actual fasteners formed after extrusion by the equipment are taken out, the fasteners are sectioned, the assembly parameters of the sectioned fasteners are measured, and three-dimensional models of different types of fasteners are established based on the measured fastener assembly parameters; in order to facilitate the distinction and planning of different fasteners, different fastener three-dimensional models are marked with different colors when establishing the three-dimensional model of the fastener.

[0018] Use the connector to simulate the installation of the established three-dimensional model of the fastener according to the process digital model, and directly perform automatic drilling and riveting cycle judgment when setting the offline programming path. The process digital model mainly includes the point information of the fastener; taking the rivets installed on the aircraft skin as an example, the rivets installed on the aircraft skin are represented by points at different spatial positions in the process digital model parameters. According to the information of the normal point addition of the aircraft digital model skin, the accurate installation position of the fastener can be ensured. According to the determined accurate installation position of the fastener, the established three-dimensional model of the fastener is simulated and installed on the assembly. The path setting of offline programming is generally the shortest distance. In a relatively small area, the shortest distance is used for setting. Because of the structural differences of the wall panel components, the working head in some positions needs to avoid the product and do certain position processing. In this way, the installed fasteners under the shortest distance setting will have interference to a great extent. However, in practice, it can also be set according to the symmetrical path taken by the wall panel structure to avoid stress.

[0019] According to the set offline NC program, simulation elements and interference analysis requirements, the interference risk of fasteners and assembly parts can be simulated.

[0020] The preparation of offline CNC programs involves the selection of fasteners, the installation sequence of fasteners, the working position of the equipment's working head, the motion control of the equipment, the function selection of the equipment, etc. Figure 1 In the figure, according to the installation sequence of fasteners 1, fasteners 2, fasteners 3, fasteners 4, fasteners 5, and fasteners 6, the working position of the lower working head, and the corresponding equipment motion control and equipment function selection, the offline programming simulation effect diagram is as follows: Figure 1 As shown, fasteners 1 and 2 are fasteners of the same type with different brands, which are distinguished by dark blue and sky blue in the offline simulation programming effect diagram, fasteners 3 and 4 are fasteners of the same type with different brands, which are distinguished by brown and pink in the offline simulation programming effect diagram, and fasteners 5 and 6 are fasteners of the same type with different brands, which are distinguished by silver and yellow in the offline simulation programming effect diagram. Different types of fasteners have different diameters, shapes, and structures. The fastener model in the attached figure has been modeled according to the actual cut-out dimensions of the equipment after riveting and forming, which can truly simulate the fastener installation process. The lower working head includes the lower actuator, turntable and tools, which are necessary elements for simulation.

[0021] The simulation elements involved mainly include the wall panel component processing equipment with simulated installation of fasteners, the bracket and the working head on the equipment, and the wall panel component processing equipment with simulated installation of fasteners, the bracket and the working head under the equipment.

[0022] The specific interference analysis requirement is that during the entire process of program simulation of the physical movement and installation, not only there is no interference with the working head of the equipment, but also there is no interference and collision with the lower working head of the equipment.

Claims

1. A method for analyzing interference risk between a fastener and a working head, characterized in that: include: cutting the fastener after extrusion forming, measuring assembly parameters of the fastener, and establishing a three-dimensional model of the fastener based on the measured assembly parameters of the fastener; The three-dimensional model of the fastener established based on the connector is simulated and installed according to the process digital model and assembly parts; According to the set offline NC program, simulation elements and interference analysis requirements, the interference risk of fasteners and assembly parts can be simulated.

2. The interference risk analysis method between a fastener and a working head according to claim 1, characterized in that: When establishing the fastener 3D model, different types of fastener 3D models are distinguished by different colors.

3. The interference risk analysis method between a fastener and a working head according to claim 1, characterized in that: The set off-line numerical control program specifically includes the selection of the type of fasteners, the installation sequence of the fasteners, the working position of the working head of the equipment, the motion control of the equipment and the function selection of the equipment.

4. The interference risk analysis method between a fastener and a working head according to claim 1, characterized in that: The simulation elements include a wall panel assembly processing device after fasteners are installed, a bracket and a working head on the equipment, a wall panel assembly processing device after fasteners are installed, and a wall panel and a working head under the equipment.

5. The interference risk analysis method between a fastener and a working head according to claim 1, characterized in that: The interference analysis requirements are specifically as follows: during the entire process of simulating the physical movement and fastener installation as simulated by the program, not only will there be no interference between the upper working heads of the equipment, but there will also be no interference or collision between the lower working heads of the equipment.

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