SU926573A1 - Device for testing materials for friction and wear - Google Patents

Description

one

This invention relates to a technique I testing materials for friction and from; Nose, in particular coatings in vacuum. A device for testing materials for friction in vacuum, containing a vacuum chamber, drive shaft and friction samples installed in it, load-measuring mechanisms placed on the shaft, and mechanisms for stopping samples 1.

The closest to the proposed technical essence and the achieved effect is a device for testing materials for friction and wear, containing a vacuum chamber, parallel shafts installed in it to place the sample and counter piece, drive the rotation of the shafts, the loading mechanism made in the form of a rod , springs and flywheel, and sample stopping mechanism 2.

A disadvantage of the prior art devices is low accuracy and efficiency, due to the fact that the samples after triggering the mechanism of their disconnection remain in contact until the end of testing other samples, and when the adhesive-adhered samples are disconnected, the state of their friction surfaces changes.

The purpose of the invention is to improve the accuracy and efficiency of testing materials for friction and wear.

ten

This goal is achieved due to the fact that the device for testing materials for friction and wear is provided with supports fixed in the chamber for the sample shaft and shaft lever

Claims (2)

IS of the counterpiece, mounted on this shaft with a friction torque meter, fixed on the lever by an electromagnet, interacting with the loading mechanism and electrically connected with an 20 meter of the moment of friction, and the mechanism of the shaft stop and the other shoulder - with a lever. FIG. 1 shows the device, a general view; in fig. 2 - the same, top view; in fig. 3 shows section A-A in FIG. 2. The device comprises a chamber 1, shafts 2 and 3 for placing the sample and contra-edge 5, a rotation drive 6, a loading mechanism made in the form of a rod 7, a spring 8 and a flywheel 9 a sample stop mechanism 10 and 5. The device is equipped with a support 11 for the shaft 2 sample C, lever 12 dl. shaft 3 of the counterpiece 5. Support 11 is rigidly attached to the bottom of chamber 1, and lever 12 is hinged. On the shaft 3, a friction torque meter 3 is installed, and on the market 12, an electromagnet 14 interacting with the rod 7 of the mechanism to be loaded. The stopping mechanism of the shaft 3 is made in the form of a pushing lever 15 pivotally fixed on the support 11. In the rod 7, there is an eyelet 16 in which a check 17 is placed, rigidly connected to the core of the electromagnet 1. The friction torque meter 13 is made in the form of a sleeve arm, acting on the strainer 18 with pasted strain gauges (not shown). The electromagnet 14 is electrically connected to a potentiometer microswitch (not shown). The device works as follows. After the test sample 4 is fixed on the shaft 2 and the counter piece 5 on the shaft 3 of the lever 12 by screwing the flywheel 9 along the thread to the rod 7, the samples 4 and 5 are loaded through the spring 8. Then, the vacuum chamber 1 is sealed and pumped out using vacuum pumps (not shown). The shaft 2 is rotated. Measurement of the friction force arising from sample sliding k relative to counterpiece 5 is performed by means of a friction torque meter 13 fixed on the shaft 3 and acting on the goggle 18 with load cells glued on it, the signal from which after amplification is recorded by a potentiometer. After abrasion of the coating material on sample 4, the threshing force increases sharply, which is fixed by a potentiometer, and when the preset value is reached, the microswitch of the potentiometer automatically triggers, closing the electromagnet circuit 14, which leads to its triggering. The core of the electromagnet 14, moving, pulls the pin 17 out of the eyelet 16 of the rod 7, which under the action of the spring 8 passes through the hole in the lever 12 and is retained in the fixed support 11, which has a smaller hole diameter. Simultaneously, when moving together with the rod 7, the flywheel 9 acts on the shoulder of the pusher lever 15 hinged on the support 11 and pre-installed in front of the flywheel 9. As a result, under the action of the lever pusher 15, the movable lever 12 moves to the extreme inoperative position ( dead center), in which the contrabe 5 remains disconnected with test sample 4 until the end of the remaining friction pairs. The positive effect of the invention is due to the increased accuracy and efficiency of testing materials for wear and tear. Claims A device for testing materials for friction and wear, containing a vacuum chamber, parallel shafts installed therein for placing a sample and a counter sample, rotating shaft drives, loading and stopping mechanisms for samples, characterized in that, in order to improve accuracy and efficiency, it is equipped with fixed in the chamber with a shaft for the sample and a lever for the shaft of the counter piece mounted on this shaft with a friction torque meter fixed on the lever with an electromagnet interacting with the load mechanism voltage and electrically associated with the friction torque meter, and stopping kontrobraztsa shaft mechanism is designed as a pusher-arm interacting with one arm of the loading mechanism, and the other arm - with the lever. Sources of information taken into account during the examination 1. USSR author's certificate No. 308978, cl. G 01 N 3/56, 1969. 2. USSR author's certificate number 1744JO, cl. 42 to 38/02, 1965 (about totigo. Fig.Z L