Method for detecting roundness and straightness of large deep hole part in boring process

Abstract

The invention discloses a method for detecting the roundness and straightness of a large deep hole part in a boring process. Firstly, a system for detecting the roundness and straightness of the largedeep hole part is established; laser light emitted by a laser displacement sensor is divided into two beams of light through a reflection prism; one beam of light is returned to the laser displacement sensor along an original light path, and the other beam of light is irradiated on a position sensitive detector through a spectroscope; the laser displacement sensor and the position sensitive detector transmits collected information to a data acquisition card in real time, and the information is processed through a data storage module and a pre-machining module; and finally measured roundness and straightness errors are evaluated in an error evaluation module. According to the detection method disclosed by the invention, machining parameters can be adjusted according to a detected error signal, and feedback closed-loop control is carried out on boring machining, so that the machining quality is improved, and the machining efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of detection of roundness and straightness of large deep-hole parts, in particular to a method for detecting the roundness and straightness of large deep-hole parts during the boring process. Background technique [0002] Generally, holes with an aspect ratio greater than 10 are called deep holes. Deep hole processing accounts for more than 40% of the hole processing field, such as gun barrels, artillery barrels, large ship crankshafts, aircraft landing gear, oil drilling cylinders, and nuclear power pumps. etc. belong to the category of deep hole processing. Due to the large diameter and long aspect ratio of large deep hole parts, the internal space is relatively narrow, which brings great difficulties to the processing and measurement process. [0003] At present, there is no proprietary high-precision testing instrument for the roundness and straightness testing of large deep-hole parts. For the measure...

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Problems solved by technology

However, this measurement method has large errors and cannot meet the needs of existing machining accuracy.

[0004] Xi'an Institute of Optics and Fine Mechanics once proposed to use laser and CCD sensors to detect the roundness of large cylindrical parts. However, this method is inefficient and requires manual operation, which is difficult to automate.

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