SU1415149A1 - Method and apparatus for testing materials for wear - Google Patents

Abstract

The invention relates to material testing for wear in the presence of abrasive and impact loads. The aim of the invention is to approximate the test conditions to the operating conditions of the rollers, for example, a crawler tractor. The flat sample 5 is brought into contact with the counterpiece 4, they are loaded and the holder 2 is rotated. By rotating the disk copier 7, the sleeves attached to the fingers in the holes 8 come into contact with the stop U and unload the sample 5, With the code bushings from contact with the stop 10, shock loading of sample 5 of the counterpiece 10 occurs. Thus, a cyclical measurement is carried out. loading energy and friction paths. 2 sp.f-ly, 2 ill. a and

Description

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The invention relates to the field of material testing for friction and wear, in particular to methods of testing material and coating for wear resistance under abrasive wear conditions in the presence of shock loads of a complex nature.

The purpose of the invention is to approximate usability; test it to the operating conditions of the road wheels under impact loads by adjusting the first path of friction between single shock loads.

sample 4 and sample 5, their loading unit 6, the drive (not shown) of rotation of holder 2, it is equipped with a disk copier 7 with holes 8 installed coaxially with holder 2, in which fingers are fixed (not shown by sleeves 9 mounted on fingers rotatably, a drive (not shown) of rotation of the disk-copier 7, behind the stop 10 of adjustable length fixed on the node 6 by means of the platform 11. The node 6 is made in the form of a double arm 5 levers, on one arm of which

FIG. 1 shows the device 15 Pour the weights 12, the other his shoulder

material test for wear on

1FIG. 2 is a view A of FIG. one.

 The device contains a frame 1,

I holders 2 and 3, respectively, of the contra-edge 4 and sample 5, their loading unit 6, the drive (not shown) of rotation of the holder 2, It is provided with a copier 7 installed with holes 8 in which the fingers (not shown) with sleeves 9 mounted rotatably on the fingers, a drive (not shown) of rotation of the disk-copier 7 fixed to the node 6 by the stop 10 of adjustable length by means of the platform 11. The node 6 is made in the form of a two-armed 5 levers, on which one arm weights his other shoulder

performs the role of holder 3. Abrasive 13 is brought into contact with sample 5 and counter-sample 4 from bunker 14.

The length of the stop 10 is chosen from the conditions

four

A2 + g

Max

- h2 b 1 - -J

n h -.

ma "| mi "

where A is the distance between the axis of the holder 2 and the center of rotation of the lever 6;

the distance from the axis of the holder 2 to the lever 6; distance between lever 6 and stop 10J

maximum and minimum radii of the fingers setting circles on the disk-copier 7 This condition determines the loading energy under shock load.

The required value of the friction path between two blows of the sleeves 9 on the stop 10 with a given loading energy is determined by the angle y, the minimum value of which is found from the condition

: y.2-rrnJ2tZ J5A.,

R

de oi - the angle of rotation of the finger in the period of contact with the support 10, 45 - the angle of deviation of the lever arm 6 with the weights 12 during the period of contact of the second shoulder with the finger ;,

disk copying speed

the length of the lever arm 6 from the center of rotation to the location of the weight 12;

acceleration when the lever returns to position 6. The operation of the device in carrying out the method of testing the material for wear consists in the following.

P

B „a

A1IM

- (Hh) 2,

five

0

five

0

five

,,

with

The flat sample 5 of the material is brought into contact with the counterpiece 4, they are loaded with the required number of weights 12, the bunker 14 is fed into the contact by an abrasive 13, the holder 2 with the counterpiece 4 is brought into rotation, and also with the help of a corresponding disk-copier drive As a result, sample 5 slides along counterpiece 4 through the abrasive layer 13. During rotation of the disk-copier 7, sleeves 9 come into contact with the stop 10, which causes unloading of the contact of sample 5 and the counterbaster 4, and the output of the sleeve 9 from contact with the stop 10 prosh Audit their loading and resumption of sliding friction. Thus, a cyclic change in the energy of loading and the path of friction is made, which is determined by the given conditions (the choice of the length 1 of the stop 10 and the angle).

In this case, the duration of the cycles is. The loadings are chosen non-multiple times of one revolution of the counterpiece 4, which is ensured by the use of the drives of the holder 2 of the counterpiece 4 and the disk-copier 7.

Claims (2)

1. A method of testing the material for wear, which consists in introducing a flat sample of material into contact with the counter sample, loading them, putting the counter sample in rotation and bringing an abrasive, which is in contact, into contact. Due to the fact that, in order to bring the test conditions closer to the operating conditions of the support rollers under impact loads, the loading energy and the friction path are cyclically changed, and the length of the CRC-LOB is chosen to be a multiple of one counterpart rotation time. 2. A device for testing material for wear, containing a frame, holders of a counter piece and a sample mounted on it, a loading unit made in the form of a double-arm, and a drive of the holder A2 + J.2 - h2  -Max where .A is the distance between the axis of holding - 20 the distance between the lever and the body of the counterpiece and the center of the stop turning the lever, the maximum and minimum H is the distance from the axis of the holder; the radii of the circles are set to the lever; finger ki on the disk-copier. f / / /; ten IG.2 9 counter-bite, characterized in that it is provided with a disk-copier mounted coaxially with the counter-baffle holder with holes located on concentric circumferences fixed in said holes with fingers, sleeves mounted on respective fingers rotatably, rotating the disk-copier and fixed on the load unit, an emphasis of adjustable length, designed for alternate interaction with the discs of the copier, and the length of the stop 1 is chosen, and from condition I  LAIN - (Hh) S. 35 / / / t ( // / / 7