A small-diameter deep hole coaxiality detection method and device

Abstract

The invention discloses a method for detecting the coaxiality of a small-diameter deep hole. A target coordinate acquisition device is arranged at one end of the deep hole, and a detection device is arranged in the deep hole. The detection device is provided with a plurality of targets; The hole is moved to different depth positions to stop, and the target coordinate acquisition device collects the coordinate values ​​of the target at the stop position of the detection device, and obtains the coordinate values ​​of the center of the deep hole at this place by measurement, and the center coordinate values ​​of the stop positions at different depths, The change value of the deep hole axis in the radial direction is obtained by measuring, and the change value of the deep hole diameter is obtained by measuring the target coordinate values ​​at different depth stop positions. The target coordinate acquisition equipment adopts a photogrammetric camera, and the side of the target detected by the photogrammetric camera is set on the same plane, that is, the target plane. After the detection device stops at different depth positions in the deep hole, the target plane and The deep hole axis is automatically vertical.

Description

technical field [0001] The invention relates to a method for detecting the coaxiality of a small-diameter deep hole, in particular to a method for measuring the center of a circle at different positions in the small-diameter deep hole and a method for measuring the diameter. The invention also relates to a small-diameter deep hole coaxiality detection device. Background technique [0002] The 500m aperture spherical radio telescope FAST (Five-hundred-meter Aperture Sphericalradio Telescope) will be the largest and most sensitive radio astronomy telescope in the world. Using the karst depression in Guizhou as the station site, a spherical crown reflector is laid in the depression, and a parabola is formed through active control to converge electromagnetic waves. A light steel cable is used to drag the feed platform to realize the pointing and tracking of the telescope. [0003] The reference surface of the FAST active reflector is a spherical surface with a diameter of 500m ...

AI Technical Summary

Problems solved by technology

[0006] When machining a small-diameter deep hole in the piston rod, due to the longer hole depth, the tool shake will become more and more obvious during the machining process, the axial direction of the deep hole will deviate, the diameter will also deviate, and the phenomenon of inclined hole and tapered hole will appear. If the error is large, it cannot meet the design requirements, so the coaxiality test must be carried out

There are also detection methods and devices for detecting the coaxiality of deep holes in the prior art, but the diameter range of the deep holes to be detected is relatively large, usually more than 50mm, and the structure of the detection device is relatively complicated, and it is not easy to realize miniaturization by reducing the size to adapt to small diameter deep holes. hole, and the detection device needs to be pulled to travel, it cannot be used for blind hole detection, it can only be used for through hole detection

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