Deep hole straightness laser detection method based on mathematic means

Abstract

The invention discloses a deep hole straightness laser detection method based on a mathematic means. An adopted detection device is composed of parts such as a T-shaped draw bar, a sleeve, a spring, a wedge-shaped rod, a position sensitive detector, a laser emitter, an analog-digital (A / D) converter and a computer. The deep hole straightness laser detection method comprises the following steps of detecting changes of faculae through the position sensitive detector, inputting information of position changes of the faculae and displacement changes of the vertical direction of the device in the computer, obtaining space discrete points, then selecting extreme points of the space discrete points, solving the middle points or centroid of the extreme points, sequentially obtaining continuous points, enabling a connection line of the continuous points to serve as a deep hole axis, finally solving the straightness of the deep hole axis, enabling the discrete points to be connected to form a curve, according to a sampling and filtering principle, decomposing the curve into two curves with different frequencies, and finally solving the straightness of the deep hole axis. The deep hole straightness laser detection method can dynamically detect transverse amount of changes of an actual axis of the hole in the whole process, can precisely solve the straightness of the deep hole axis , and further enables the detection means to be high in precision.

Description

technical field [0001] The invention relates to a method for detecting the straightness of hole parts, in particular to a vertical laser detection method for the straightness of deep holes. Background technique [0002] Deep hole machining is complex and special, and it is difficult to observe the machining parts and tool conditions. The machining process is affected by many factors such as tool holder deformation, system chatter, workpiece material, drill parameters, cutting parameters, oil pressure, and difficulty in chip removal. The axis of deep-hole parts often deviates. Once the deviation reaches a certain level, the straightness error of the axis of the deep-hole parts will change sharply, resulting in adverse consequences such as drill bit damage, workpiece scrapping, low product accuracy, and unqualified quality. Since deep hole processing serves the equipment manufacturing industry, the quality of deep hole workpieces directly affects the development of the equipm...

AI Technical Summary

Problems solved by technology

[0004]The research on deep hole straightness detection and deviation correction technology at home and abroad continues to deepen, but compared with other measurement items, the straightness detection technology is lagging behind, especially in For the straightness detection of the hole axis of large and long workpieces, so far, there is no mature product for detecting the deviation of the straightness of the deep hole axis

In practice, workers often use calipers to measure the wall thickness along different radial directions at both ends of the hole to judge the straightness. This method cannot measure the internal axis deviation of the deep hole, that is, it cannot realize the deep hole parts The full continuous dynamic detection of straightness is very imprecise, and it is easy to fall into the misunderstanding of point-to-surface

[0005]The price of some high-precision straightness testing instruments is relatively expensive, which is unacceptable

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