Simulating calculation method for tolerance of automotive sub assembly

Abstract

The invention discloses a simulating calculation method for the tolerance of an automotive sub assembly. The method comprises the following steps: S1, workpiece models are established for parts and tools of the automotive sub assembly, and a measuring point and a part standard are established for the shape feature of each part; S2, the parts are assembled on the tools according to an assembling sequence, and the automotive sub assembly is formed; S3, a frame model is established according to standard technological parameters of the automotive sub assembly, and the automotive sub assembly is mounted into the frame model; S4, dimension measurement is performed on the measuring points of the parts in the frame model on the basis of the part standards, and the tolerance of an automotive sub assembly is calculated according to measurement results. According to the method, the models of the parts and the tools of the automotive sub assembly are established with three-dimensional simulating software, then simulating assembly is performed, the tolerance is measured and calculated finally on the frame model of the automotive sub assembly, factors such as positioning, tolerance and the like after tolerance assembly of each link are considered sufficiently, and the manufacturing standard is met better.

Description

technical field [0001] The invention relates to the technical field of vehicle engineering and production technology, in particular to a method for simulating and calculating tolerances of automobile sub-assemblies. Background technique [0002] With the development of China's machinery industry, the automobile industry as its pillar industry has matured day by day. [0003] There are thousands of parts in a car, and there are various mechanisms and systems, such as crank linkages, starting systems, and so on. In order to ensure the quality of the whole car, every part of the car needs to ensure the manufacturing accuracy, and at the same time, the dimensional chain accuracy may be guaranteed after the parts of the assembly, mechanism or system are assembled. [0004] At present, in the existing technology, various computer simulation techniques can be used to help dimension engineers to conduct feasibility analysis of dimension technical specifications and functional dimen...

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Problems solved by technology

[0005] However, after the tolerance design of a single part is complete, it does not necessarily meet the manufacturing standards - because the tolerance design of a single part does not take into account the tolerance targets that need to be considered when each link of the car is spliced ​​into a sub-assembly

In the prior art, it is difficult to design the tolerances of multiple parts assembled into one or more subassemblies. At present, the tolerance design of the subassemblies is mainly based on past experience, based on subjective feelings and general evaluation. This often leads to the tolerance of the subassemblies The design does not meet its design goals, and it is not conducive to the process control of production

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