Countersunk angle measurement method

Abstract

The invention provides a countersunk angle measurement method. Two gauge measurement heads with different diameters are used, a geometric relation is then used to obtain a countersunk angle value, during the period, an angle measurement device needs to be used for assisted measurement, a zero correction step needs to be carried out before measurement, and thus accuracy of numerical value measurement can be ensured. The angle measurement device is used for carrying out angle measurement on the countersunk, the measurement method is not only time-saving and labor-saving but also enhances the measurement precision, the two gauge measurement heads with different diameters are delicately used during the period to measure two different insertion depths, and the geometric formula is then used for calculation to accurately obtain the numerical value of the countersunk angle.

Description

technical field [0001] The invention belongs to the field of aerospace detection, and in particular relates to a method for measuring the angle of a countersunk head. Background technique [0002] A large category of aerospace fasteners is countersunk head fasteners, such as countersunk head bolts, countersunk head rivets, etc. These fasteners need to be installed and tested in the production and acceptance process. During the process and the test, a large number of mounting plates and test fixtures with countersunk holes are required. Whether the size of the countersunk hole (especially the angle of the countersunk hole) is qualified or not directly affects the use effect and detection of countersunk head fasteners. As a result, the detection of the size of countersink parts is very important. [0003] Such as figure 1 As shown, the processing and inspection of tapered countersunk hole parts generally follow three processing dimensions: bottom hole size D, countersink out...

AI Technical Summary

Problems solved by technology

[0004] The countersunk angle gauge and its measuring method disclosed now can effectively solve the problem of measuring the countersunk angle, but the premise of its realization is that the outer edge dimension Dk of the countersink needs to be measured first, using The vernier caliper has poor accuracy in measuring Dk. Although the accuracy is high when using a digital projector, the operation is cumbersome, and it is not suitable for the measurement requirements of large quantities of zero activity in the workshop.

[0005] Although the existing three-coordinate measuring instrument can directly measure the angle θ of the countersunk hole, its measurement accuracy is directly proportional to the number of sampling points. In order to obtain accurate measurement results, a large number of measurement points need to be taken, and the measurement method is cumbersome, and The efficiency is low, and it is not suitable for the large-volume and flexible measurement requirements of workshops and assembly sites

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