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A Contact Relationship Model and Assembly Error Calculation Method Considering Deformation Error

A technology of deformation error and calculation method, which is applied in the direction of complex mathematical operations, etc., can solve the problems of slow calculation speed and failure to consider the geometric error of the assembly surface, etc., and achieve the effect of accurate solution results and fast calculation convergence

Active Publication Date: 2020-07-28
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

The geometric error of the assembly surface is not considered in the calculation of the existing assembly error, and the deformation error is calculated based on the finite element method, and the calculation speed is slow

Method used

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  • A Contact Relationship Model and Assembly Error Calculation Method Considering Deformation Error
  • A Contact Relationship Model and Assembly Error Calculation Method Considering Deformation Error
  • A Contact Relationship Model and Assembly Error Calculation Method Considering Deformation Error

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Embodiment Construction

[0032] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0033] The method of the invention regards the reference plane as an ideal rigid body, and considers the influence of the deformation of another non-rigid plane matched with it on the final assembly pose. The first step of the method of the present invention is to obtain the geometric shape information of the two mating surfaces, which can be obtained by using the detection equipment to measure the two assembly surfaces; the second step is to obtain the initial contact point and the initial contact surface equation, and the mating surface can be firstly obtained through a clustering algorithm Convex hull contour, then calculate the convex hull radius and center point, and finally calculate and obtain; the third step is to establish the contact model, that is, establish the objective function and constraint conditions, and obtain it by establishing the force...

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Abstract

The invention discloses a contact relation model considering a deformation error and an assembly error calculation method. The method comprises the following steps of step 1, obtaining parametric representation of geometric shapes of two to-be-assembled surfaces; step 2, calculating an initial contact point of the to-be-assembled surface under an undeformed condition according to the geometric shapes of the two to-be-assembled surfaces; step 3, establishing a stress balance model, a deformation and stress relation model and a geometric relation model after deformation between the two to-be-assembled surfaces according to the initial contact point; and step 4, solving the stress balance model, the deformation and stress relation model and the deformed geometric relation model to obtain an assembly pose, an assembled geometric error and a deformation error, comprehensively considering the geometric error and the deformation error of an assembly surface, and calculating to obtain a finalassembly error.

Description

technical field [0001] The invention belongs to the technical field of digital assembly and error control thereof, and in particular relates to a contact relationship model considering deformation error and an assembly error calculation method. Background technique [0002] Modern manufacturing has higher and higher requirements for assembly accuracy, and it is hoped that the final accuracy and performance of the product can be predicted in the initial stage of manufacturing, so as to improve the assembly pass rate, consistency and accuracy stability. In order to realize such a technology, an assembly error calculation method that considers the geometric error and deformation error of the assembly surface is needed. [0003] In the actual manufacturing process, there are non-uniform geometric errors on the surface of the parts, which leads to the fact that the actual contact area of ​​the mating surfaces of the two parts is much smaller than the nominal contact area, and the...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/11
Inventor 张之敬金鑫刘志华房燕尚可
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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