一种大长径比小孔的轴线直线度测量方法

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中图分类号：TB9;TH711 文献标志码：A文章编号：1674-5124（2025）08-0047-07

Abstract： In order to realize high-precision measurement of the straightnessof the axis of small holes with large aspect ratio， this paper proposes a method of measuring the straightness of the axis by light bar graphic projection. Using the principle of optical axis linear propagation and optical lever amplification in the inspection system，combined with the correlation of the remote projection surface type，the method of graphic contour extraction and center coordinate calculation is used to determine the position of the axis on the remote projection screen.The extracted center point coordinates are corrected according to the pixel coordinate transformation and spatialcoordinate conversion methods，so as to obtain the axial straightness of small holes with large aspect ratio.Through the development of the principle prototype and the test of related performance， the axis straightness of the deep hole parts with an inner diameter of 8mm and a length of 300mm with a superlarge L/D ratio （ L/D ratios greater than 5 to 1O are considered to be deep holes，and those greater than 20 are considered tobe holeswithlarge L/D ratios）hasbeentested，andthismethodachievesrepeatabledetection accuracy within 5μm

Keywords： deep holes; axis; light lever amplification; straightness; image processing

0 引言

随着现代装备制造业的快速发展，高精度深孔零件已广泛应用于各大领域。（剩余8600字）