Device and method for measuring geometric parameter of superplastic non-spherical free bulge

Abstract

The invention relates to a device and a method suitable for measuring a geometric parameter of a superplastic non-spherical free bulge in a superplastic non-spherical free bulge experiment and also suitable for measuring a shape change geometric parameter of an axisymmetric rotating curved surface. The device comprises a measured bulging part, an annular light source, a video camera, a PC machineand an adjustable holder, wherein the annular light source is coaxial with a lens of the video camera and is positioned between the measured bulging part and the video camera; the annular light sourceand the video camera are arranged on the adjustable holder; and the PC machine controls the video camera to continuously acquire images of the measured bulging part and processes the acquired imagesto measure and calculate the geometric parameter of the measured bulging part. Compared with other measuring methods, the measuring method takes the measured bulging part images as information carriers and extract available information by analyzing and processing the measured bulging part images, thereby achieving the purpose of measurement; in addition, the invention has the advantages of non-contact, abundant obtained information, high measuring precision and measuring speed and the like; and the invention can realize on-line real-time measurement.

Description

Technical field: [0001] The patent of the present invention belongs to the technical field of modern advanced manufacturing instruments, and specifically relates to a device especially suitable for measuring the geometric parameters of bulging parts in the free bulging experiment of superplastic aspheric surfaces, and is also suitable for measuring the geometric parameters of the shape change of axisymmetric rotating surfaces Measurement. technical background: [0002] Superplastic bulging is one of the important processes of superplastic forming, and it plays an important role in the theoretical research and application development of superplasticity. The real geometric shape of the superplastic free bulging is an axisymmetric rotating surface. In order to establish an accurate mechanical analysis theory, it is necessary to accurately measure the contour of the rotating surface of the bulging part. However, during the bulging process, the temperature of the specimen is hig...

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Problems solved by technology

Using this instrument, there is no need to cut the specimen, as long as the data of any two points are measured along the warp and latitude, the corresponding warp curvature radius and latitude curvature radius can be obtained, but this method must be compatible with the specimen Contact, there must be random errors in human measurement, and it cannot be measured online

Using a three-coordinate measuring instrument to measure, although it is a non-contact measurement, and the data obtained is relatively accurate, but the cost of the equipment is high, the space is large, and it is not easy to measure online

Use a three-dimensional structured light scanner (such as 3DSS) to scan the contour of the bulging part first, and then measure its warp curvature radius and latitudinal curvature radius, but the price of the 3DSS scanner is also high, and the real-time performance cannot be achieved. Meet the requirements of the measurement in the experiment

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