A Method and Device for Calibrating the Perpendicularity of Hole Extrusion Mandrel Based on Laser Measurement

Abstract

The invention provides a perpendicularity calibration method and device of a hole-extrusion mandril based on laser measurement. The device comprises three laser measuring sensors, an mounting ring and a data-processing module, wherein the three laser measuring sensors are installed at the mounting ring in a uniform distribution mode, and the mounting ring is fixed on the bottom surface of an upper beam of a pressure machine; the data-processing module receives and calculates measurement-point distance information collected by the laser measuring sensors. By fixing the laser measuring sensors on the mounting ring, the calibration method and device guarantee that the laser measuring sensors have an equidistance from each other and are located on the same plane; by utilizing measuring functions of a plurality of laser measuring sensors, the calibration method and device avoid errors brought by naked eye observation, improve data precision, guarantee smooth conducting of hole extrusion, reduce defective rates, and improve working efficiency. Due to a small size, the calibration device can be used in smaller space and horizontal tests of a smaller plane. By using the laser measuring sensors, the calibration device can achieve the function of acquiring levelness information of a tested surface without contacting the tested surface, thereby judging whether or not the mandril is perpendicular to a pressure-machine head.

Description

technical field [0001] The invention relates to the technical field of metal hole extrusion. Specifically, the present invention relates to a laser calibration method capable of checking the verticality of the mandrel in the extrusion of the tab hole. The invention also relates to a laser calibration device for the verticality of the mandrel in the extrusion of the tab hole. Background technique [0002] Parts with holes in the aircraft structure are prone to fatigue problems. In order to improve the fatigue performance of the hole structure of aircraft parts and increase its safe service life, hole extrusion strengthening, shot peening strengthening, surface chemical heat treatment and other processes are often used. Among them, the hole extrusion strengthening process is widely used because of its simplicity and effectiveness. [0003] In the hole extrusion strengthening process of the lug, the lug is first placed on the fixture under the press, and then the mandrel is i...

AI Technical Summary

Problems solved by technology

When the device measures the levelness of the plane, its base needs to be placed above the plane to be tested. However, the core rod during the hole extrusion process is not fixed and the upper surface of the core rod is too small to realize the placement of the level instrument.

In addition, the space between the mandrel and the press head is limited, which will also cause inconvenience to the operation

[0006] The verticality check system proposed in the invention patent CN105598595A avoids the naked eye observation and contact measurement methods in the prior art, but due to the angle limitation between the measurement directions of different measurement sensors in the system, the check system is only suitable for It is used for the horizontal calibration of a large plane, but the upper surface area of ​​the mandrel is too small to adopt the calibration method of this system

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