Measuring gauge and measuring method for counterbore angle

Abstract

The invention provides a measuring gauge for the countersink angle and a measuring method thereof. The measuring gauge comprises a follow-up angle assembly and a numerical value display assembly. One end of a first measuring rod and one end of a second measuring rod in the follow-up angle assembly are hinged, and the hinged position of one end of the first measuring rod and one end of the second measuring rod is a measuring hinged point. A first passive rod is hinged to the second measuring rod and a numerical value main scale to form two first hinged points, a second passive rod is also hinged to the first measuring rod and the numerical value main scale to form two second hinged points, and the spacing of the two first hinged points is equal to the spacing of the two second hinged points. The follow-up angle assembly is connected with the numerical value main scale through the measuring hinged point. According to the measuring gauge, the numerical value display assembly and the follow-up angle assembly are matched so that the countersink angle can be measured accurately and easily, and the tedious complex working procedure is needless.

Description

technical field [0001] The invention belongs to the field of angle measurement, and in particular relates to a measurement gauge and a measurement method for counterbore angle. Background technique [0002] Countersunk holes are often provided in upsetting dies, testing tooling and many parts. The opening angle of the counterbore has a great influence on the mechanical properties of parts such as fit, pre-tightening force, and high cycle fatigue. Since the opening of the counterbore is a concave conical surface, it cannot be directly measured with an ordinary protractor and projector. [0003] In view of the above situation, the current methods for measuring the angle of the counterbore include the lead filling method, the riveting filling method, the coloring profiler method, and the three-coordinate measuring instrument method. Among them, the lead filling method and the pressure riveting filling method are to fill the counterbore cavity of the test piece with another mat...

AI Technical Summary

Problems solved by technology

Among them, the lead filling method and the pressure riveting filling method are to fill the counterbore cavity of the test piece with another material through fluid deformation or plastic deformation, and then take out the filled material forcibly, and indirectly measure the shape angle of the filling material. Obtaining the angle of the counterbore, the implementation process of this method is cumbersome and complicated, and it also requires a large temperature rise or fall or a large pressure. At the same time, when the filling material is forcibly taken out, its shape angle is easily changed again, resulting in a large measurement error. ;The coloring profilometer method is to use a cone with a known angle value, apply a coloring agent on the surface of the cone or the surface of the counterbore of the measured part, then insert the cone into the counterbore to make the two contact, and finally separate the two, through the previous The size of the dyed area on the surface of the object without dyeing agent is used to judge whether the angle of the counterbore of the measured object is consistent with that of the cone. This method can only judge whether the two angles are equal and which one is larger and which is smaller. It cannot measure the unequal situation The precise value of the angle of the countersunk hole; while the three-coordinate measuring instrument method is to use the probe of the three-coordinate measuring instrument to touch the surface of the counterbore, and calculate the angle of the counterbore after numericalizing the shape of the counterbore in three-dimensional coordinates. The method is expensive

[0004] Based on the above-mentioned several methods all fail to obtain accurate values ​​for the angle of the counterbore, and the measurement method is cumbersome or expensive, so it is necessary to propose a measuring gauge that can accurately measure the angle of the counterbore and at the same time can be used In the case of the measurement gauge, devise a method that allows the operator to quickly draw numerical conclusions

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