Ultrasonic deep hole straightness detection method and device

Abstract

The invention relates to a deep hole straightness detection method and device, in particular to an ultrasonic deep hole straightness detection method and device. The method includes the following steps: fixing the detection frame, adjusting zero, measuring the position of the wall of the deep hole, and calculating the center of the section circle. The device adopted in the method includes a detection frame and a detection part. The detection frame includes a magnetic force adsorption device and a positioning block, and the detection part includes a digital differential head and an ultrasonic thickness gauge. The invention eliminates the principle error of the existing means of ultrasonically measuring the straightness of deep holes, and greatly improves the measurement accuracy of the straightness of deep holes. Especially for workpieces with constant wall thickness and deep hole bending, it has good discrimination. The ultrasonic probe can move along the guide rail of the machine tool with the detection frame, and can detect the straightness of the deep hole of the workpiece to be measured within the entire length range. The detection device uses the disassembly process of bolts and nuts, which greatly improves the detection efficiency.

Description

technical field [0001] The invention relates to a deep hole straightness detection method and device, in particular to an ultrasonic deep hole straightness detection method and device. Background technique [0002] Deep hole machining is complex and special. The machining process is affected by many factors such as tool holder deformation, system chatter, workpiece material, drill bit parameters, cutting parameters, oil pressure, difficulty in chip removal, etc., and deep hole parts often have axis deviation. Once the deviation is to a certain extent, the straightness error of the axis of the deep hole part will change sharply, resulting in adverse consequences such as drill bit damage, workpiece scrapping, low product accuracy, and unqualified quality. [0003] Straightness detection runs through the entire deep hole processing process. It is an important means to control product quality in the deep hole field, and it is also a basic index that must be considered in deep ho...

AI Technical Summary

Problems solved by technology

[0004] The detection methods for the straightness of the deep hole axis include wall thickness measurement method, laser measurement method, gauge measurement method, arm rod measurement method, telescope measurement method, etc. These methods either do not consider the influence of the surface quality of the inner and outer circles of the workpiece on the measurement results, or It is limited by the small hole diameter and cannot be used to measure deep hole workpieces with too small hole diameter

[0005] Some existing deep hole straightness detection devices use ultrasonic thickness gauges to determine the straightness of the deep hole of the measured workpiece only by measuring the wall thickness of the deep hole of the measured workpiece. Impact

Moreover, if this method is used to measure parts with constant wall thickness but the axis of the deep hole is curved, it is very likely that the axis of the deep hole will be misjudged as a straight line.

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