Three-dimensional scanning detection method of cavity cavity structure

Abstract

The invention discloses a method for three-dimension scanning detection of an inner cavity structure of a cavity. The detection method comprises the steps that firstly, locating balls are fixed to the outer wall of the cavity; secondly, a workpiece coordinate system equal to that of a product digital analogy is established on the cavity through measuring software, each locating ball is measured, and workpiece coordinate values are recorded; thirdly, spherical coordinate values of the locating balls on a sheet body are measured through a mechanical coordinate system; fourthly, the mechanical coordinate values of the locating balls on the sheet body are manually changed into workpiece coordinate values measured before cylinder cover dissection; fifthly, an inner outline of the sheet body is scanned so that a three-dimensional model can be established and be compared with the introduced product digital analogy in a 3D mode. According to the detection method, the sheet body after dissection is compared with the product digital analogy in the 3D mode so that a color deviation diagram of the inner outline can be observed and the size deviation condition of a casting piece can be visually observed through a chromatic aberration zone in the diagram and colors on the surface of the casting piece.

Description

technical field [0001] The invention relates to the field of three-dimensional scanning, in particular to a three-dimensional scanning detection method for a cavity inner cavity structure. Background technique [0002] Three-dimensional scanning is a high-tech that integrates optical, mechanical, electrical and computer technologies. It is mainly used to scan the spatial shape and structure of objects to obtain the spatial coordinates of the object's surface. Its significance lies in the ability to convert the three-dimensional information of the object into a digital signal that can be directly processed by the computer, which provides a very convenient and quick means for the digitization of the object. [0003] As a fast three-dimensional measurement equipment, the three-dimensional scanner makes up for the existence of the three-coordinate measuring machine, which is easy to damage the probe, scratch the surface of the measured part, slow measurement speed, difficult to ...

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Problems solved by technology

[0003] As a fast three-dimensional measurement equipment, the three-dimensional scanner makes up for the existence of the three-coordinate measuring machine, which is easy to damage the probe, scratch the surface of the measured part, slow measurement speed, difficult to obtain continuous coordinate points and unable to measure fragile and fragile objects. Disadvantages of measuring deformed objects

[0007] At present, 3D scanning is used for 3D comparative analysis, which mainly scans and analyzes the outer surface contour of the product. For the inner cavity structure, it can only be scanned after dissection, but because the dissected sheet is not consistent with the product Digital models (design 3D models) have the same coordinate system, so it is difficult to compare them in 3D

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