CN-121997464-A - Frame assembly dimensional tolerance design method, electronic equipment and storage medium

CN121997464ACN 121997464 ACN121997464 ACN 121997464ACN-121997464-A

Abstract

The invention belongs to the technical field of chassis design of commercial vehicles and discloses a frame assembly size tolerance design method, electronic equipment and a storage medium, which comprises the following steps of S1, identifying size problems, namely decoupling the size problems affecting the installation and quality problems of the whole vehicle, determining the critical dimension of the whole vehicle related to the quality problems, and identifying the critical dimension of the frame assembly from the listed critical dimension of the whole vehicle; S2, design optimization of the frame assembly size precision, namely identifying the current situation of the frame assembly critical size precision, setting a frame assembly critical size precision target, and analyzing and optimizing the frame assembly critical size to achieve the precision target, and S3, finishing improvement and summarization. The invention designs a frame assembly dimensional tolerance design method which is used for solving the problems of assembly, performance and reliability caused by unreasonable traditional tolerance design, and improving the dimensional accuracy of a frame by optimizing the frame dimensional chain design and the structural performance and quality of the whole vehicle.

Inventors

WANG JIYAO
ZHOU LIBIN
ZHANG XUEBIN
XU TONG
LIU BAO

Assignees

一汽解放汽车有限公司

Dates

Publication Date: 20260508
Application Date: 20260303

Claims (10)

1. A frame assembly dimensional tolerance design method is characterized by comprising the following steps: S1, identifying size problems, namely decoupling the size problems affecting the installation and quality problems of the whole vehicle, determining the critical size of the whole vehicle related to the quality problems, and identifying the critical size of the vehicle frame assembly from the determined critical size of the whole vehicle; S2, optimizing the design of the dimensional accuracy of the frame assembly, namely identifying the current situation of the critical dimensional accuracy of the frame assembly, setting a critical dimensional accuracy target of the frame assembly, and analyzing and optimizing the critical dimension of the frame assembly to achieve the accuracy target; and S3, finishing improvement and summarizing.
2. The method for designing dimensional tolerances of a vehicle frame assembly according to claim 1, wherein step S1 includes: S11, based on a DFMEA complex problem analysis thought, finding out the problems of the whole vehicle installation and quality and analyzing the parts related to the key size chain of the whole vehicle; s12, definitely and listing all the key dimensions of the whole vehicle related to the installation and quality problems; S13, identifying the critical dimension of the frame assembly based on the listed critical dimension of the whole vehicle, classifying the critical dimension of the frame assembly, and dividing the critical dimension of the frame assembly into two main classes of A class and B class, wherein the A class is the critical dimension which needs to be further decomposed, and the B class is the critical dimension which does not need to be further decomposed.
3. The method for designing dimensional tolerances of a vehicle frame assembly according to claim 1, wherein step S2 includes: s21, identifying the critical dimension precision current situation of the frame assembly, namely acquiring the critical dimension data of the frame assembly based on the measurement of the existing production vehicle model, and comparing the critical dimension data with the theoretical dimension to obtain the dimension qualification rate current situation; S22, setting a critical dimension precision target of the frame assembly, namely setting a target of the critical dimension qualification rate of the frame according to standards, regulations, experience or benchmarks; s23, achieving the critical dimension precision target of the frame assembly, namely defining a dimension chain sealing ring, and respectively analyzing a class A critical dimension precision and a class B critical dimension precision achieving path according to experience and a standard matching means.
4. A vehicle frame assembly dimensional tolerance design method according to claim 3, wherein in step S21, the vehicle frame assembly critical dimensional accuracy status recognition includes: s2111, deriving key dimensions of the concerned class A frame assembly based on actual measurement; s2112, confirming a theoretical tolerance value of the critical dimension of the vehicle frame assembly A based on a standard comparison result, project input and the manufacturing and assembly requirements of the whole vehicle; S2113, calculating the critical dimension qualification rate of the frame assembly, namely obtaining all detected actual measurement values based on the actual measurement of the critical dimension of the A-type frame assembly of the currently-produced vehicle type frame, differencing the actual measurement values with reference values to obtain actual tolerance, comparing the actual tolerance with theoretical tolerance to obtain the data quantity meeting the theoretical tolerance, and obtaining the data quantity meeting the theoretical tolerance by a formula And calculating to obtain the qualification rate.
5. The method for designing dimensional tolerances of a vehicle frame assembly according to claim 3, wherein in step S22, the target setting of the qualification rate of the critical dimension of the vehicle frame is performed by measuring the critical dimension of the vehicle frame of the international advanced commercial vehicle enterprise by searching a gap from the target.
6. The method of claim 3, wherein in step S23, the class a critical dimension accuracy achievement path comprises: S2311, definitely affecting a size chain sealing ring with larger influence on the critical dimension of the frame assembly, namely, selecting the size chain sealing ring with larger influence on the critical dimension through ring sensitivity analysis on the size chain and sensitivity analysis results; s2312, analyzing the size chain of the frame assembly and checking tolerance distribution, namely, determining the precision requirement of a closed loop of the selected size chain, analyzing the component rings of the size chain, and checking the tolerance of the closed loop; S2313, a measure for improving the dimensional accuracy of the frame assembly is to comprehensively consider cost control and process stability in the process of achieving the tolerance of the component ring to optimize the tolerance by considering the measures of reducing the component ring, reasonable size marking, process realization capability and hole pin floating, and to verify and analyze by adopting 3DCS dimensional engineering software.
7. The method for designing dimensional tolerances of a vehicle frame assembly according to claim 3, wherein in step S23, the B-class critical dimension accuracy achievement path is based on dimension accuracy achievement measures and performs experimental verification including performing reference standardization, component dimension accuracy improvement, process tool applicability improvement and dimension accuracy maintenance.
8. The method for designing dimensional tolerances of a vehicle frame assembly according to claim 1, wherein in step S3, actual result comparison analysis is performed to complete drawing improvement and dimensional tolerance design accumulation of the vehicle frame assembly.
9. An electronic device, comprising a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface, the memory, and the communication bus are used for completing communication between each other, the memory is used for storing a computer program, and the processor is used for implementing the dimensional tolerance design method of the frame assembly according to any one of claims 1-8 when executing the program stored on the memory.
10. A storage medium having stored thereon a computer program, the program being executable by a processor for implementing the carriage assembly dimensional tolerance design method of any one of claims 1-8.

Description

Frame assembly dimensional tolerance design method, electronic equipment and storage medium Technical Field The invention belongs to the technical field of chassis design of commercial vehicles, and particularly relates to a frame assembly dimensional tolerance design method, electronic equipment and a storage medium. Background The frame is used as a bearing substrate and an assembly reference of the whole automobile, the assembly size precision of the frame directly determines the installation precision and the matching quality of key assemblies such as a balanced suspension, a cab, an axle, a steering system and the like, and the frame is a core element for guaranteeing the assembly consistency, the running stability and the reliability of the whole automobile. The dimensional deviation of the frame can not only cause production and manufacturing problems such as component assembly interference, difficult installation alignment, low assembly efficiency and the like, but also directly cause functional faults such as whole vehicle deviation, abnormal tire abrasion, driving vibration, cab deviation and the like, thereby obviously reducing the structural strength, durability and service life of the whole vehicle and influencing the driving safety and driving experience of the vehicle. Along with the technical development of light weight, high bearing capacity and long service life of automobiles, the frames are formed by stamping and welding high-strength steel plates, and the manufacturing links involve multiple procedures such as stamping and forming, welding deformation, tool positioning, heat treatment and machining, and the size transfer chain length and error accumulation effect are remarkable. In the current industry, aiming at the definition and distribution of the tolerance of the frame assembly and parts, historical experience, standard data or subjective judgment are generally relied on, and a systematic tolerance decomposition and optimization method matched with the actual manufacturing process, assembly constraint and the whole vehicle performance requirement is lacked. The existing tolerance design has the problems of tolerance redundancy, excessive looseness of critical dimensions, excessive strict non-critical dimensions, unreasonable closed loop of a dimension chain, mismatching with process capability and the like, is difficult to control error transmission and accumulation from the source, and cannot effectively support high-precision manufacturing and whole vehicle performance of a vehicle frame to reach the standard. Therefore, there is a need for a tolerance decomposition, distribution and optimization method to solve the assembly, performance and reliability problems caused by the unreasonable design of the conventional tolerance. Disclosure of Invention The invention provides a frame assembly dimension tolerance design method, electronic equipment and a storage medium, which are used for solving the problems of assembly, performance and reliability caused by unreasonable conventional tolerance design aiming at the frame assembly and combining process manufacturing actual conditions, and improving the frame dimension precision and the whole vehicle structural performance and quality by optimizing the frame dimension chain design. The specific scheme comprises the following steps: a frame assembly dimensional tolerance design method comprises the following steps: S1, identifying size problems, namely decoupling the size problems affecting the installation and quality problems of the whole vehicle, determining the critical size of the whole vehicle related to the quality problems, and identifying the critical size of the vehicle frame assembly from the determined critical size of the whole vehicle; S2, optimizing the design of the dimensional accuracy of the frame assembly, namely identifying the current situation of the critical dimensional accuracy of the frame assembly, setting a critical dimensional accuracy target of the frame assembly, and analyzing and optimizing the critical dimension of the frame assembly to achieve the accuracy target; and S3, finishing improvement and summarizing. Further, step S1 includes: S11, based on a DFMEA complex problem analysis thought, finding out the problems of the whole vehicle installation and quality and analyzing the parts related to the key size chain of the whole vehicle; s12, definitely and listing all the key dimensions of the whole vehicle related to the installation and quality problems; S13, identifying the critical dimension of the frame assembly based on the listed critical dimension of the whole vehicle, classifying the critical dimension of the frame assembly, and dividing the critical dimension of the frame assembly into two main classes of A class and B class, wherein the A class is the critical dimension which needs to be further decomposed, and the B class is the critical dimension which does not need to be further decomposed. F