RU32601U1 - Friction machine for wear test in sliding friction - Google Patents

Description

Friction machine for wear test in sliding friction

The invention relates to a measuring technique designed to study the processes of wear of materials under sliding friction when reproducing in laboratory conditions the most dry, natural signs of the type of wear. As applied to abrasive wear, such signs are testing on a continuously updated surface of a counterbody of constant abrasion with the possibility of realizing the corresponding; its level of power loading of the samples. Carrying out experimental studies devoted to the study of wear as a process of surface destruction of materials during sliding friction, places high demands on modeling the stochastic nature of contact interaction, on the accuracy and information content of measurements.

A laboratory facility is known from the prior art (V.P. Vinogradov, G.M. Sorokin. Mechanical wear of steels and alloys. M., Pedra, 1996, 361 pp.) (P. 50-51), intended for testing abrasive materials wear due to sliding friction over a monolithic abrasive. In this installation, the rotation of the grinding wheel is transmitted from the electric motor using an intermediate gear and a pair of bevel gears. The carriage is driven back and forth using a gearbox and a radial feed screw. The carriage drive reducer is equipped with a reverse device. In order to eliminate the directed roughness of the friction surface of the specimen, it was informed of rotation around its own axis using a radial feed screw and a pair of bevel gears. Loading of the sample is carried out by a lever with loads. The sliding speed of the sample on the grinding circle 2 О О 31

MKH G01N3 / 56

gu per test cycle is variable. Sample wear is determined by the weight loss of the sample over the test cycle.

Since the counterbody in this case is an abrasive wheel, the level of force loading of the samples can be changed over a wide range. However, the Archimedes spiral, which is the trajectory of the relative movement of the sample and the counterbody, does not provide updates to the abrasive surface.

The prior art designs of sclerometers of the “static type” for studying friction processes and measuring the strength of surface layers of materials (AS No. 111342 USSR, IPC G01 N 3/56. Abrasive wear metal testing apparatus / EA Ferrari, B .B. Afonin. Publish. 19.11.58, Bull. No. 18; AS 123744 USSR, IPC G01 N 3/46. Method and device for measuring hardness / N. A. Yashkir Publ. 1959, Bull. No. 21 ) To assess abrasion resistance, a sclerometer is proposed, the indenter of which is made in the form of a diamond cone mounted in a working head located above the surface of a movable object in the rectilinear direction for a tiled sample and connected by a lever device to a piezoelectric sensor ball, which picks up the force of scratching and directs the signal to the recording device.

As the disadvantages of the described devices can be noted a single contact of the indenter with the test surface. At the same time, it is not possible to determine the effect of multiple contact of the investigated surface and counterbody on the friction process.

The prior art machine UMT-1, which allows you to test various pairs of friction, made in the form of samples of the type of disk-finger.

significant for installing a disk sample on it. A self-aligning disk is installed on the shaft connected to the membrane pneumatic loading mechanism, which serves to fix three finger samples placed on a fixed friction radius at an angle of 120 °. The disk is connected through a flexible connection with a hollow shaft interacting with the elastic element of the force meter (Testing technique: Handbook. In 2 books / Ed. By V.V. Klyuyev, - M .: Mechanical Engineering, 1982, Book 1, p. 234) .

The described machine is characterized by a limited scope, since in such tests it is not possible to investigate abrasive wear. Tests on this machine are carried out on non-renewable friction surface.

The essence of the invention lies in the fact that the machine is equipped with a revolution counter, and the test samples are mounted in collet chucks mounted with the possibility of self-installation on the axles of the satellites rolling around the sun wheel mounted on the shaft end, rotating in a movable mandrel, and the shaft can be fixed with a locking screw, and receiving rotation through a friction gear, interact with the counterbody, and the normalization of the linear wear of the samples is achieved due to the interaction of the contacts, one of which it is mounted on a movable mandrel and insulated from the housing by means of dielectric gaskets, and the other is fixed on a control ruler, the position of which is adjusted using coarse and fine-tuning screws.

The invention is illustrated by drawings (Fig. 1,2). The machine consists of a housing 1, supports 2, a slider 3, a carriage 4, a movable mandrel 5, a counterbody drive motor 6, a gearbox 7, a bevel gear 8, an open chain gear 9, a gearbox for a linear movement of the carriage 4, a rocker mechanism 11, a drive motor rotation of the samples 12, the friction gear 13, the shaft of the load device 14, the sun wheel 15, the satellites 16, the ring gear 17, the ball bearings 18, the collet chucks 19, the samples 20, the counterbody 21, the strut 22, the upper 23 and the lower 24 contacts of the measuring device 25 , regulation screw 26, fine screws 27 and coarse 28 settings, load device 29, bearings 30, carrier 31, plan washers 32, dielectric spacers 33, bracket 34, gears 35, 36, upper 37, lower 39 and movable 38 counter contacts revolutions 40, locking screw 41, guides; there are 42.

The operation of the friction machine is as follows; Torque from the drive motor of the counterbody 6 is transmitted through the gearbox 7 and the bevel gear 8 mounted on the output shaft of the gearbox and interacting with the wheel 35 mounted on the axis of the plan washer 32, on which the counterbody 21 is mounted. From the wheel 35 through the wheel 36, open chain transmission 9, the gearbox of the drive 10 is fast; the moment is transmitted to the rocker mechanism 11, which reports linear movement to the slider 3 with respect to the supports 2. Together with the slider 3, the carriage 4, in which the frame is mounted, is linearly moved 5 and having the opportunity to move in the vertical direction under the action of its own weight and the weight of goods. The electric motor for driving the rotation of the samples 12 through the friction gear 13 transmits the rotation to the shaft of the load device 14, on the output end of which the gear wheel 15 is fixed. The satellites 16 mounted on the carrier 31, rotating around the wheel 15, move relative to the gear ring 17, providing relative rotation of the samples 20, mounted in collet chucks 19, which are mounted on ball bearings 18 mounted on the axles of the satellites 16.

23. The position of the lower contact 24 of the measuring device 25, depending on the required wear rate of the samples 20, is determined by fine screws 27 and rough 28 settings.

After turning on the electric motors 6 and 12, the samples 20 perform a complex movement with respect to the counterbody 6. At the same time, they move along the constantly updated surface of the counterbody, which is a positive factor from the point of view of the methodological support of the experiment. The wear of the samples 20 during friction in cooperation with the counterbody 6 leads to vertical mixing, shaft 14. The gap between the contacts 23 and 24 decreases and when the contacts are closed, the machine stops. In this way, rationing of linear wear is achieved.

Claims (1)

Friction machine for wear testing under sliding friction conditions, including a housing, a counterbody drive electric motor, an open bevel gear, a chain gear, a linear carriage drive gear reducer, a rocker mechanism, supports for moving a slide on which a carriage with a vertically movable mandrel is mounted and the shaft of the load device, characterized in that the machine has two independent drives of the counterbody and the shaft of the load device, is equipped with a rev counter, and the studied samples s fixed in collet chucks mounted with the possibility of self-installation on the axles of the satellites rolling around the sun wheel, mounted on the output end of the shaft of the load device rotating in a movable mandrel, the shaft can be fixed with a locking screw and receiving rotation by means of a friction gear, interact with counterbody, and the normalization of linear wear of the samples is achieved due to the interaction of contacts, one of which is mounted on a movable mandrel and isolated from Pusa by dielectric spacers, and the other is fixed on the measuring device, the position of which is adjustable by screwing the coarse and fine adjustment.