Non-contact inner parallel plane distance measuring method for large-sized workpiece

Abstract

The invention discloses a non-contact inner parallel plane distance measuring method for a large-sized workpiece. The method comprises the following steps: rotating a measuring head around a spindle rotation axis; respectively scanning two opposite planes of a measured workpiece by using a first laser displacement sensor and a second laser displacement sensor so as to obtain a distance between a measuring axis and an intersecting point of the two opposite planes; determining the distance as a measuring line; figuring out all measuring lines in real time; obtaining a first minimum value of the measuring lines; stopping the rotation of the measuring head around the spindle rotation axis in the position where the first minimum value is obtained; rotating the measuring head, so that the measuring axis rotates around a rotating shaft; and respectively scanning the two opposite planes of the measured workpiece by using the first laser displacement sensor and the second laser displacement sensor so as to obtain a second minimum value of the measuring lines, wherein the second minimum value is the distance between the two inner parallel planes. Through the adoption of the non-contact inner parallel plane distance measuring method for the large-sized workpiece disclosed by the invention, the internal size of the large-sized workpiece is measured, the measuring precision is improved, the measuring cost is reduced and the measuring time is reduced.

Description

technical field [0001] The invention relates to the measurement of the distance between inner parallel planes, in particular to a non-contact method for measuring the distance between parallel planes inside a large workpiece. Background technique [0002] With the improvement of my country's advanced manufacturing capabilities, super-large equipment is playing an increasingly important role in the development of the national economy. The fields of aviation, aerospace, shipbuilding, turbines and generators require a large number of large-scale geometric measurement technologies as support. At present, for the measurement of large workpieces, in addition to traditional measurement techniques such as micrometers, tapes, line rulers and chord height methods, there are also many modern measurement methods, mainly including theodolite measurement, total station measurement, tracker measurement, and dual-frequency measurement. Laser interferometer measurement, articulated coordinat...

AI Technical Summary

Problems solved by technology

[0006] 2. Operation problems of measuring instruments

The time-consuming disassembly and assembly of this kind of scaffolding will cost the same as the cutting man-hours, which greatly affects the processing efficiency and cost.

[0007] 3. Handling of large workpieces

However, due to the large size and heavy weight of large workpieces, the workpieces are usually transported by cranes. The process of handling is complicated and takes up a lot of man-hours

The problem brought by the handling is not only an additional operation process, but also, if the workpiece is unqualified after the inspection, it needs to be returned to the original machine tool for repair. Yes, in this way, the whole process takes a huge amount of man-hours

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