Measuring method of diameter and cylindricity of slender inner hole based on error separation of dual sensors

Abstract

The present invention discloses a long and thin bore diameter and cylindricity measurement method based on dual-sensor error separation. A standard ring gauge is taken as a calibrating device to sleeve a dual-sensor measuring head, a first harmonic elimination approach method is employed to calibrate the dual-sensor measuring head, the dual-sensor measuring head is sleeved with the bore of a measured workpiece, the complete cycle scanning measurement is performed section by section along the axial direction and the circumferential direction of the bore, the distance measurement data of each section of the two sensors are employed to obtain average values and perform difference to realize calculation and separation of line feed errors of each section and the eccentricity error of each section is separated to convert the finally processed measurement data to a rectangular coordinate system and add the eccentricity error of the corresponding section in the data points of each section so as to restore the contour of the measured bore, the least square method is employed to obtain the diameter of the bore contour, and the cylindricity evaluation method is employed to perform cylindricity calculation. The long and thin bore diameter and cylindricity measurement method based on the dual-sensor error separation can realize calibration of an unidirectional electronic measurement head so as to effectively separate the line feed errors of a guide rail and the eccentricity error of each section of the bore of the workpiece so as to greatly improve the detection precision of the long and thin bore diameter and the cylindricity.

Description

technical field [0001] The invention belongs to the technical field of on-line measurement, in particular to a method for measuring the diameter and cylindricity of an elongated inner hole based on error separation of double sensors. Background technique [0002] In the honing process of the slender inner hole, the diameter and cylindricity error of the inner hole are important performance indicators of the honing process. In order to ensure the honing quality, it is necessary to carry out online detection of the cylindricity error of the inner hole. Due to the small diameter of the slender inner hole, conventional testing instruments cannot penetrate into the inner hole, so it has always been a technical problem in the engineering field. [0003] At present, the cylindricity test of the slender inner hole mostly adopts a cylindricity meter or a pneumatic measuring instrument. However, the cylindricity meter is often used for cylindricity detection in the laboratory, and ca...

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Problems solved by technology

[0005] In the measurement of the cylindricity error of some inner holes, two electronic displacement sensors are symmetrically arranged in the three cross-sections distributed along the axial direction of the measuring head. The linear motion error of the guide rail introduced, but due to the small number of sections, the measurement accuracy is affected to a certain extent, and it cannot adapt to various inner holes of different lengths

[0006] In addition, the cylindricity error measurement of the inner hole uses two mutually perpendicular photoelectric sensors to detect the offset of the collimated laser spot position, and separates the translation and tilt of the double probe caused by the straightness error and motion error of the guide rail, and then measures the measurement. This measurement method is based on photoelectric detection technology and can achieve high measurement accuracy through error compensation. However, due to the complexity of the measurement implementation principle and device, it is only suitable for large-scale Bore measurement

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