Normal loading device of fretting fatigue test system

Abstract

The invention discloses a normal loading device of a fretting fatigue test system. The device adopts the scheme that a base is fixed on the table board of a tension torsion multi-axial fatigue tester through a thread; two transverse guide rails are fixed on the base; a nut of a lead screw is mounted at the right end of the base; a screw of the lead screw is connected with a right baffle plate of a clamping mechanism; the clamping mechanism is characterized in that a sliding block on the bottom surface of a bottom plate is matched with the guide rails on the base; a left baffle plate and a right baffle plate connected through four guide rods are fixed at the left and right ends of the bottom plate; a pressure sensor which is opposite to a pressure head of the right baffle plate is mounted in a groove on the right side of a right chuck; a right inching pad is arranged in an arc-shaped groove of the right chuck; an air cylinder is fixed on the left side of the left baffle plate; a piston rod of the air cylinder penetrates through the left baffle plate to be connected with a buffer block; the right side surface of the buffer block is opposite to the left side surface of a movement plate; the right side of the movement plate is connected with a left chuck through a three-dimensional sensor; a left inching pad is arranged in an arc-shaped groove of the left chuck. The normal load loaded by the test deice can preferably keep constant and the test result is more correct and reliable.

Description

technical field [0001] The invention relates to a test device for fretting fatigue in the field of mechanical engineering. Background technique [0002] Fretting (fretting) refers to the relative motion with extremely small amplitude ( Displacement amplitude is generally on the order of microns), that is, fretting occurs in mechanical parts that are "tightly" fitted. [0003] Fretting fatigue refers to the fatigue of the contact surface due to deformation caused by fretting. The fretting fatigue phenomenon mainly occurs in a variety of fittings with interference fit: such as the press fit of the rolling stock wheel axle, various fastening mechanisms and clamping mechanisms. These fatigue phenomena can be simplified experimental research using the contact model of horizontal cylinder (fretting pad) / vertical cylinder (sample) / horizontal cylinder (fretting pad) Two opposite extrusion lines on the sample in the interference fit). For the horizontal cylinder / vertical cylinder...

AI Technical Summary

Problems solved by technology

The problem is that during the test, the sample will alternately deform, causing the fretting pad to vibrate and the thread to loosen, resulting in a gradual decrease in the normal load, and it is difficult to maintain a constant normal load, resulting in test results Large error and low reliability

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