Fixing device for use in inspection of skin parts

Abstract

The invention discloses a fixing device for use in inspection of skin parts. The fixing device is characterized in that: magnetorheological fluid(2) placed in a magnetic field source is used as support medium; the skin parts are assembled under a liquid-state condition by utilizing the physical characteristics of the magnetorheological fluid(2) that can realize solid-liquid conversion under an action of medium-strength magnetic fields; and by changing the physical environment of the phase change materials, the uniform support of the magnetorheological fluid(2) in the liquid state is realized, so that the parts are not forced to be contacted with a clamp, the influences of the forced clamping on the external shape of the parts are avoided, the original fixing device is greatly simplified, and the accuracy and the reliability of the three-dimensional measurement shape of the skin parts are guaranteed. The fixing device also has the characteristics of instantly completing the phase change with the magnetorheological fluid(2) as the support medium, using a permanent magnetic disc(1) as the magnetic field source, not needing an external power supply, saving energy, along with convenient use.

Description

technical field [0001] The invention relates to a detection and holding device for sheet metal parts, in particular to a holding device for optical three-dimensional inspection of skin-type sheet metal parts. Background technique [0002] The aircraft skin is a thin-walled sheet metal part with a curved surface that surrounds the aircraft frame. The skin usually has a free-form surface shape, with large dimensions and low stiffness. In the past, the conventional method of checking the conformity of the shape of the skin part with the theoretical shape was to manufacture a test frame, and after installing the skin on the test frame, use a feeler gauge to measure the gap between the sample and the skin in the test frame; Or place the skin on the molded tire and check the fit between the two by tapping. The inspection method needs to manufacture special tooling, and the effect has a considerable relationship with the experience of the operator. With the development of three-d...

AI Technical Summary

Problems solved by technology

Since the standard fixture and the part only contact at limited points, and the fixture is rigid, the measurement results are also easily affected by gravity, the number of clamping points and the uniformity of clamping force. The degree of influence is difficult to quantify, and the whole system is relatively complicated. In addition, the whole system is prone to shaking, which affects the accuracy of optical measurement

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