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Tolerance allocation method and device for flexible thin-walled structures based on deformation base

A technology of tolerance distribution and thin-walled structure, applied in geometric CAD, design optimization/simulation, special data processing applications, etc., to improve measurement efficiency and assembly quality, and solve the problem of tolerance design of flexible large thin-walled structures

Active Publication Date: 2020-07-14
CAPITAL AEROSPACE MACHINERY +1
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Problems solved by technology

These methods are mainly aimed at the 3-2-1 six-point positioning assembly of rigid parts. The large thin-walled structure has a certain degree of flexibility. In actual assembly, N-2-1 positioning is used, and the traditional tolerance distribution method is not applicable.

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  • Tolerance allocation method and device for flexible thin-walled structures based on deformation base
  • Tolerance allocation method and device for flexible thin-walled structures based on deformation base
  • Tolerance allocation method and device for flexible thin-walled structures based on deformation base

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specific Embodiment

[0159] see Figure 6-8 In this embodiment, four aluminum alloy wall panels with a thickness of 8.2 mm, a length of 727.5 mm, and a radius of 1675 mm are selected for assembly to obtain a cylindrical thin-walled structure. The tolerance requirements of the cylindrical thin-walled structure after assembly are as follows: the flatness of the two ends of the assembly is less than 2mm, the parallelism of the end surfaces is less than 2.5mm, and the distance between the end surfaces is 727.5±2mm, and the tolerance allocation is carried out for the cylindrical structure.

[0160] Such as image 3 Shown: Divide the substructure based on the topological structure of the thin-walled structure, extract the stiffness matrix and mass matrix of each component in the finite element software, and use the modal analysis method to calculate the mode shape of the component at different frequencies, select the first 8 The mode shape of the first order is used as the basic deformation basis of th...

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Abstract

The invention discloses a tolerance distribution method and device for a flexible thin-wall structure based on a deformed base, and belongs to the technical field of machine manufacturing. According to the tolerance distribution method for the flexible thin-wall structure based on the deformed base provided by the invention, a modal shape forming a basic unit of an assembly is selected as a basic deformed base, a bias field is represented by using the deformed base and a corresponding bias factor, the relevance of the bias factor of the assembly and the bias factor of the basic unit is used as one item in constraint conditions, an objective function for a tolerance allocation model is solved, and an optimal bias factor of the assembly is solved, so that prediction and control for the bias factor of each basic unit of the assembly are realized, and the tolerance design problem of the flexible large thin-film structure can be solved. Tolerance values are allocated for each basic unit, so that the measuring efficiency and the assembling quality of the product are effectively improved.

Description

technical field [0001] The invention discloses a tolerance distribution method and device of a flexible thin-walled structure based on a deformation base, and belongs to the technical field of mechanical manufacturing. Background technique [0002] Tolerance allocation technology is an important basic technology in the machinery manufacturing industry, which determines the final delivery quality of products and has an important impact on product quality and maintenance costs. Reasonable tolerance allocation can reduce assembly cost and improve production efficiency on the basis of ensuring assembly interchangeability and coordination. [0003] After searching the literature of the existing technology, it is found that the existing tolerance allocation technology establishes the tolerance analysis and calculation technology based on the error dimension chain, and uses extreme value method, statistical method, Monte Carlo method and other methods for tolerance analysis. These...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/17G06F30/23
CPCG06F30/17G06F30/23
Inventor 陈金存王贺周世杰余海东呼啸赵钺孙莹黄霞孙宏波邓向阳田志杰孙立强
Owner CAPITAL AEROSPACE MACHINERY
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