Device for measuring thickness of any point of free-form surface and measuring method thereof

Abstract

The invention discloses a device for measuring the thickness of any point of a free-form surface and a measuring method thereof. The device comprises an ultrasonic thickness measurement main body structure, a buffer connection structure and a coupling agent supply structure. The ultrasonic thickness measurement main body structure is used for probe angle self-adaptive adjustment and probe and workpiece contact force measurement so that a measurement axis and a vector normal of a workpiece contact point are self-adaptive coincident and stable in contact; the buffer connection structure is usedfor guaranteeing coaxial connection between the thickness measurement main body structure and the tail end of an external movement mechanism and has buffer and guide effects at the same time; and thecoupling agent supply line ensures stable coupling of the probe and the workpiece. The device can solve the problem of automatic detection of the thickness of a thin-wall complex curved surface workpiece and can be installed at the tail end of the movement mechanism to achieve automatic detection of the thickness of the free curved surface workpiece and can also be installed at the tail end of a numerical control machine tool handle to achieve on-machine measurement to obtain the wall thickness of a part blank or the residual wall thickness distribution state in machining.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic measurement and detection, and in particular relates to a device and a measurement method for measuring the thickness of an arbitrary point on a free-form surface. Background technique [0002] Large-scale thin-walled parts represented by rocket tank wall panels, rocket nozzles, and aircraft skins are key parts of major aerospace equipment, and the remaining wall thickness after processing must meet the requirements of equal wall thickness or variable wall thickness according to a certain rule. Processing requirements. Measuring the wall thickness distribution of the part or the remaining wall thickness distribution state in the machine inspection process is a necessary link to judge whether the workpiece meets the requirements, and it is also the core process link to implement the redesign of the part processing target surface and the automatic compensation of the wall thickness error. Howeve...

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Problems solved by technology

[0004] The object of the present invention is to provide a device for measuring the thickness of any point on a free-form surface and its measuring method, so as to solve the problem of large structural size of parts, complex overall surface shape, many points to be measured, and low measurement accuracy in the automatic detection process of thickness of thin-walled workpieces. Low, poor repeatability, measurement of contact force can not be accurately quantified and other issues

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