Bolt fatigue test clamping device and centering tool thereof

Abstract

The invention relates to a bolt fatigue test clamping device and a centering tool thereof. The centering tool of the bolt fatigue test clamping device comprises a polished rod section, a left arc-shaped positioning sheet and a right arc-shaped positioning sheet, wherein the axis of the polished rod section extends in the up-and-down direction and is inserted into a to-be-tested bolt when being used, and the left arc-shaped positioning sheet and the right arc-shaped positioning sheet are correspondingly arranged between the hole walls of a screw puncture hole in an upper clamp; the left arc-shaped positioning sheet and the right arc-shaped positioning have inner circumference arc faces and outer circumference arc faces, the diameter of the inner circumference arc faces is coincident with the outer diameter of the polished rod section, and the diameter of the outer circumference arc faces is coincident with the hole diameter of the screw puncture hole. The centering device capable of guaranteeing coaxiality of the bolt and the screw puncture hole in the upper clamp and the bolt fatigue test clamping device with the centering device are provided.

Description

technical field [0001] The invention relates to a clamping device for a bolt fatigue test and a centering tool thereof. Background technique [0002] With the vigorous development of the aerospace field in recent years, more and more special process bolts are used in the aerospace field, and are mainly used for core components such as engines. Due to the size and test requirements of such special process bolts It is different from ordinary fasteners, which increases the difficulty of the test and causes certain errors in the test results. Existing special bolts such as figure 1 As shown: it includes a screw whose axis extends in the up-and-down direction and a head 10 arranged on the upper end of the screw. The screw includes a polished rod section 11 and a threaded section 12 arranged up and down. The outer diameter of the threaded section is larger than that of the polished rod section. In the actual test The bolts are connected to the testing machine through the clampin...

AI Technical Summary

Problems solved by technology

[0002] With the vigorous development of the aerospace field in recent years, more and more special process bolts are used in the aerospace field, and are mainly used for core components such as engines. Due to the size and test requirements of such special process bolts It is different from ordinary fasteners, which increases the difficulty of the test and causes certain errors in the test results

Existing special bolts such as figure 1 As shown: it includes a screw whose axis extends in the up-and-down direction and a head 10 arranged on the upper end of the screw. The screw includes a polished rod section 11 and a threaded section 12 arranged up and down. The outer diameter of the threaded section is larger than that of the polished rod section. In the actual test The bolts are connected to the testing machine through the clamping device. The clamping device includes an upper clamp and a lower clamp. The lower clamp is provided with a threaded hole that matches the threaded section. The upper clamp is provided with a screw hole that is coaxial with the threaded hole. The polished rod section of the screw is installed in the screw hole, and the head of the screw is located on the upper side of the screw hole. The upper and lower clamps apply dynamic and static tension to the screw in the up and down direction to perform fatigue tests on the bolt. The existing technology The problem is: due to the requirements of the process, the hole diameter of the screw hole must be consistent with the diameter of the threaded section, that is to say, the hole diameter of the screw hole will be larger than the diameter of the polished rod section, which may cause the bolt to deviate from the axis of the bolt hole during assembly, and the bolt cannot be guaranteed The axial direction of the test machine is along the up and down direction, and the loading force of the testing machine on the bolt may have a component force in the horizontal direction, which may easily cause inaccurate test results. Inclination will lead to contact between the upper fixture and the head and the connection part of the polished rod section, which will seriously lead to inaccurate test results

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