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Assembly parameter optimization method in a shaft hole dynamic assembly process

A technology of dynamic assembly and optimization method, applied in electrical digital data processing, special data processing applications, constraint-based CAD, etc., can solve the problem that the optimal assembly scheme cannot be solved, the detailed geometric features of the shaft hole cannot be characterized, and the assembly features cannot be characterized. And other issues

Active Publication Date: 2019-04-12
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0003]At present, in domestic and foreign research, the only method is based on the traditional tolerance method, grouping tolerance grades, shaft hole tolerance grades, and group selection to improve assembly accuracy. It cannot characterize the detailed geometric features of the shaft hole, so this method cannot characterize the actual assembly features, cannot express the actual assembly state, and cannot solve the optimal assembly scheme

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  • Assembly parameter optimization method in a shaft hole dynamic assembly process
  • Assembly parameter optimization method in a shaft hole dynamic assembly process
  • Assembly parameter optimization method in a shaft hole dynamic assembly process

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Embodiment Construction

[0028] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0029] Such as figure 1 As shown, the geometric appearance of the shaft and the hole is not ideal, so the present invention proposes an assembly method considering the actual part features based on the mathematical expression of the actual geometric features of the shaft and the hole. Through the precise geometric model of the actual features of the part, the actual model of the part is parameterized, and the mathematical model of the spatial geometric relationship of the shaft hole assembly is established. The optimal assembly position is used as the basis for calculating the assembly index, and the space non-interference is used as the calculation constraint to calculate the assembly. Pose, providing process guidance for actual assembly, in which the assembly index provides quantitative indicators for judging the assembly effect, and provides an evaluati...

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Abstract

The invention discloses an assembly parameter optimization method in a shaft hole dynamic assembly process. The assembly parameter optimization method comprises the following steps that 1, parametricrepresentation is conducted on the geometrical morphology of a shaft and a hole to be assembled; step 2, setting shaft and hole assembly evaluation indexes; step 3, setting constraint conditions of shaft hole assembly according to the geometrical morphology of the shaft and the hole; and step 4, taking the evaluation index as an objective function of the optimization problem, and solving the optimal assembly parameter under the constraint condition of shaft hole assembly, so that the assembly pose, the assembly angle and the assembly direction can be accurately and quantitatively calculated according to the local morphology of the shaft hole, and the actual assembly process guidance is given.

Description

technical field [0001] The invention belongs to the technical field of assembly parameter optimization, and in particular relates to an assembly parameter optimization method in the dynamic assembly process of shaft holes. Background technique [0002] Shaft-hole connection is a commonly used connection method in mechanical systems. The object of shaft-hole assembly is shaft-hole parts. The typical feature of shaft-hole parts is a cylinder. The current Geometric Dimensioning and Tolerance (GD&T) standard stipulates that the geometry of cylindrical manufactured parts Shapes should be characterized in terms of their roundness, straightness, cylindricity and diameter. However, this standard uses the maximum peak-to-valley value to define the form error, which is a very simple geometric description and cannot truly represent the real geometric shape of the part, so there are many problems in the shaft hole assembly process under this standard. For example, the shaft hole assemb...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F2111/04G06F30/17
Inventor 金鑫刘志华张之敬王子夫张棋荣尚可
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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