SU1682880A1 - Method of testing material sample friction and wear at high slip speed - Google Patents

Abstract

The invention relates to test methods and can be used to simulate tribo processes occurring during operation of magnetic rail brakes, systems for acceleration and deceleration of airplanes. The goal is to bring the test conditions to real conditions of operation of high-speed friction friction pairs at their discrete contact by reducing the intensity of the shock-pulse loads on the sample during the test. A hard disk 1 with a wavy side surface 2 is rotated by an electric motor 9. Material sample 3 is loaded. It is brought into contact with a hard disk 1. Material sample 3 is secured on an elastic element 4. By deforming, the oscillation period of sample 3 is changed to equal to its duration of rotation of the disk 1 by an angle equal to the ratio 2 to the number of waves of the side surface of the disk 1. and the curvature R ($ the side surface of the hard disk 1 is chosen from the known ratio, 1 or 3

Description

The invention relates to research methods and can be used to simulate tribo processes occurring during operation of magnetic rail brakes, systems for acceleration and deceleration of airplanes, etc.

The purpose of the invention is to approximate the conditions of isp; Tangles to the real conditions of operation of high-speed friction pairs of friction with their discrete contact by reducing the intensity of the shock impulse loads on the sample during the test.

The drawing shows a device that implements the proposed method.

The device comprises a hard disk 1 with a wavy side surface 2, a material sample 3, an elastic material 4 associated therewith, LFM.T, i.iy. O dispute 5 with it, mounted for movement in the radial direction to the hard disk 1, intended to interact with the sample 3, the guide 6 with the fluoroplastic coating, the synchronization mechanism, made in the form of the gate frame 7 and the screw-elastic elastic element 8, the electric motor 9 with the drive mechanism 10, the measuring complex 11, made in the form of sensors 12, the power supply unit, Atele and recorders (not shown).

The method is implemented as follows.

A hard disk 1 with a wavy side surface 2 causes an electric motor to rotate 9, load material sample 3, bring it into contact with hard disk 1, fix material sample 3 on the elastic element 4. Change the sample oscillation period by deforming 3 materials until its equality is equal to the duration of the rotation of the dig. As angle C) - 2 L / i. the material sample is fixed in this position by the slide frame 7, and the curvature of the lateral surface of the hard disk 1 is chosen from the ratio

R ((p) Ro + -C- + (A - -%) sin f +

+ Ј slnJ (y.-j,

where Ro is the average radius of the disk;

And - wave height of the lateral surface of the disk;

p is the angular coordinate of the lateral surface of the disk;

I - the number of waves of the lateral surface of the disk;

f is the coefficient of friction of the sample material by the material of the guide;

g is the acceleration of free fall;

0

five

0

five

0

five

0

five

0

five

p g (M +) - oscillation frequency

ABOUT

a sample of material fixed on an elastic element;

g is the stiffness of the elastic element;

M is the mass of the sample material;

mo is the mass of the elastic element, and tribo parameters are determined.

Example. The rotation speed of the hard disk is about 6.73 1 / s. The diameter of the hard disk Ш0 0.765 m. The curvature of the side surface 2 of the hard disk 1 is chosen from the ratio

R (f) 0.765 + 0.003 sin 164 +

+ 0.001 sin 16 (p - |), m

Claims (1)

Sample mass 3 of material M is 0.0935 kg. The stiffness of the elastic element is 4g 281 N / m. The mass of the elastic element 4t0 0.075 kg, weight of the support 5Mio 0.1 kg. The stiffness of the screw elastic element 8 g0 487 N / m. The invention of the method of examining friction and wear of a sample at high sliding speeds, is that a hard disk with a wavy side surface causes rotation, loads a sample of material, brings it into contact with a hard disk, and determines triboparameters that differ that, in order to bring the test conditions to real conditions of operation of high-speed friction pairs of friction with their discrete contact, set the sample of the material in a guide, fix it to an elastic element e, by deforming the latter alter the value of the oscillation period of the sample material to a length equal to its value at the disk rotation angle 2lU1, fixed sample of material in this position, and the curvature of the side disk surface is selected from ratios of R (f) Ro + -C- + (A - -1) sin I p + 2 p2 p + Јsln (p- |, where Ro is the average radius of the disk; And - wave height of the lateral surface of the disk; p is the angular coordinate of the lateral surface of the disk; I - the number of waves of the lateral surface of the disk; f is the coefficient of friction of the sample material by the material of the guide; g is the acceleration of free fall; g - stiffness of the elastic element r-g (M + -) - oscillation frequency M - mass of the sample material; a sample of a material fixed on an elastic 5T0 is the mass of an elastic element. gom element; g is the stiffness of the elastic element, AM - the mass of the sample material;