Matching error calculation method for error transfer modeling of precision mechanical system

A system error and precision mechanical technology, applied in the field of manufacturing quality prediction and control, can solve the problems of non-uniform stress and strain of parts, deformation error, and the error of unconsidered matching surface shape, and achieve the effect of improving accuracy

Active Publication Date: 2012-04-25
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0005] In summary, all current error transfer models do not take into account the shape error of mating surfaces
In addition, due to the shape e

Method used

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  • Matching error calculation method for error transfer modeling of precision mechanical system
  • Matching error calculation method for error transfer modeling of precision mechanical system
  • Matching error calculation method for error transfer modeling of precision mechanical system

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Embodiment Construction

[0035] by image 3 The assembly shown is an embodiment. Part one 7 and part two 8 in the assembly are parts of a revolving body, and the two cooperate at circular end faces. The end face is the mating surface 2; the two parts are respectively provided with two radially symmetrical pin holes 9 and four screw holes 10 evenly distributed in the circumferential direction on the circumference of the end face; the establishment is as follows image 3 In the measurement coordinate system shown, the origin o of the coordinate system is located on the center of rotation of the assembly, the line connecting the centers of the two pin holes 9 is used as the x-axis, the plane where the mating surface is located is used as the xoz plane, and the y-axis is determined according to the right-hand rule.

[0036] In this embodiment, the nominal matching surfaces of the matching surface 1 and the matching surface 2 are located in the xoz plane, and all the data and coordinates measured below are...

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Abstract

The invention discloses a matching error calculation method for error transfer modeling of a precision mechanical system. The method comprises the following steps of: measuring shape errors D1 and D2 of two matching surfaces by applying a three-coordinate measuring machine to obtain data of a difference surface, and determining a contact point according to the data of the difference surface; calculating deformation errors delta 1 and delta 2 of the two matching surfaces of a part according to the contact point and assembly force applied to the two matching surfaces, thereby obtaining actual matching surface data D1+delta 1 and data D2+delta 2 considering the shape errors and the deformation errors of the two matching surfaces of the part; and calculating matching error component of the two actual matching surface to obtain matching error so as to be used for error transfer modeling of the precision mechanical system. In the method, the shape errors of the matching surfaces and the part deformation errors produced under the action of the assembly force are considered, a more accurate error transfer model can be established for the precision mechanical system on the basis, and the accuracy for the manufacturing quality prediction and control is improved.

Description

technical field [0001] The invention relates to a matching error calculation method for precision mechanical system error transmission modeling, which belongs to the field of manufacturing quality prediction and control. Background technique [0002] A common problem in the manufacture of precision mechanical systems is that when the components are qualified, the accuracy of the assembled system cannot meet the design requirements, and the assembly yield is low. One of the main reasons is that the influence of factors such as part processing error, surface quality, assembly error and assembly process parameters in the precision mechanical system on the system assembly accuracy is not clear in theory, and the assembly process is blind. The invention is proposed in the process of constructing an error transfer model expressing the relationship between the processing error of a precision mechanical system part and the system precision. [0003] In the manufacture of products w...

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Application Information

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IPC IPC(8): G06F17/50
Inventor 金鑫张之敬左富昌叶鑫
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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