SU728058A1 - Device for determining friction force of materials at deformation - Google Patents

Description

The invention relates to testing materials, and in particular to devices for determining the friction force of deformable materials.

A device for testing materials during deformation, containing a cage, two punches, a node loading the punch and the node moving the cage [1].

A disadvantage of the known device is that it does not allow to measure the coefficient of friction of cylindrical samples, which ₁₀ limits the conditions for modeling the friction of real joints.

A device for determining the friction force during the deformation of materials, comprising a base _15, a holder mounted thereon - kontrobrazets installed inside the yoke and the supporting biasing the punches which form between themselves a cavity for the test material, the loading assembly _and interacting with a conductive-loaded punch minutes meter friction forces (2].

A disadvantage of the known device is that it does not allow to simultaneously study the friction of cylindrical and annular. samples from plastic materials.

The purpose of the invention is _z expansion of the range of test samples.

This is achieved by the fact that the device is equipped with an additional cage, covering the cage-sample with a gap, with additional loading and supporting annular punches installed between the cages and forming a cavity for the material under test, fixed on the base of two hydraulic cylinders, the piston cavities of which are connected by a highway with with a throttling device, one of the supporting punches is connected to the piston of one hydraulic cylinder, and the other to the piston of the other hydraulic cylinder.

In FIG. 1 shows a diagram of a device made with a ring sample located in it; in FIG. 2 is a layout diagram of a cylindrical sample in a device.

A clip — counter-sample 2 — is installed motionlessly relative to the base 1 in the device. I load J5 is installed inside the clip 2. The device is equipped with a measurement> friction, made in the form of glued onto a clip-counter works as follows.

. . ,. 3 and 3 supporting 4 punches. Clip - the counter sample covers an additional clip 5, in which additional loading 6 and supporting 7 ring punches are installed, between which the test material is installed 8. The punches 3 and 6 are affected by the loading unit (not shown in the drawing), and the supporting punches 4 and 7 are connected according to the pistons 9 and 10 of the hydraulic cylinders 11 and 12. The piston cavities of the hydraulic cylinders 11 and 12 are interconnected by a highway 13 including a throttle assembly made in the form of an adjustable relief and safety valve 14, and two Telem way valve 16 forces the load cell, the sample 2.

Device

When testing ring samples, test. The material 8 is laid between the punches 6 and 7 and a load is applied to the punch 6. Under the action of the applied load, the punch 6 moves relative to the cage - counter-sample 2, compressing the material and the punch 7 with the piston 10. At the same time, fluid from the cavity of the hydraulic cylinder 12 flows through the valve 14 in the piston cavity of the hydraulic cylinder 11, moving the piston with the punch 4 in the upper position. The force of deformation (compression) of the material 8 is controlled using the valve 14. After testing the annular sample between the punches 3 and 4, the test material 8 is installed in the form of a cylindrical sample, a load is applied to the punch 3, with which material 8 is loaded and moved relative to the counter-sample holder. In this case, the liquid from the hydraulic cylinder 11 flows into the hydraulic cylinder 12. After testing the cylindrical sample, the device is ready for testing the ring sample. Friction force both during testing of ring and when testing cylindrical specimens of the definitions of 11 and 12 .10

728058 4 is measured using a meter 16. The deformation force of a sample is determined by the readings of pressure gauges connected to the bridges of hydraulic cylinders 11 and 12.

For compactness, the hydraulic cylinders can be replaced by one double hydraulic cylinder with two floating pistons, and the piston rods can be combined with the supporting punches 4 and 7, the holder 5 can be attached to one of the punches 6 or 7, or made with them at the same time.

Claims (2)

The invention relates to the testing of materials, namely, devices for determining the force of friction of deformable materials. A device for testing materials during deformation is known, comprising a holder, two punches, a loading element of the plug and a displacement unit of the holder 1. A disadvantage of the known device is the fact that it does not allow to measure the coefficient of friction of cylindrical samples, which limits the conditions for modeling the friction of real interfaces. A device for determining the force of friction of materials during deformation is known, which contains a base, a clip mounted on it — a scraper, installed inside {of the clip, loading and supporting punches forming between themselves a cavity dp of the material under test, firing unit, taking a load with a loading punch, and a measuring force of friction { 2 A disadvantage of the known device is that it does not allow simultaneously studying the friction of cylindrical and annular samples of plastic materials. The purpose of the invention is to expand the range of test samples. This is achieved by the fact that the device is equipped with an additional holder, which encloses the counter-splice holder with a gap, additional loading and supporting and annular punches installed between the holders and forming a cavity for the test material between them, fixed on the base of two hydraulic cylinders, the piston cavities of which are interconnected A line with a throttling device, one of the supporting poles, is connected to the piston of one hydraulic cylinder, and the other to the piston of another hydraulic cylinder. FIG. 1 shows a diagram of a device made with an annular sample located in it; in fig. 2 shows the layout of a cylindrical sample in the device. In the device, a holder — a coitraction piece 2 — is mounted stationary relative to the base 1. Inside the cage 2, loading 3 and supporting 4 punches are installed. The clip — a counter sample covers the additional clip 5; additional loading 6 and support 7 ring punches are installed in the broom, with which the test material B is installed. The punches 3 and 6 are affected by the loading unit (not shown), and the supporting punches 4 and 7 are connected respectively with pistons 9 and 10 of hydraulic cylinders 11 and 12. Sub-piston cavities of hydraulic cylinders 11 and 12 are interconnected by means of a line 13, which includes a throttling unit, made in the form of an adjustable release-and-safety valve 14, and two strokes howling crane J5. The device is equipped with a measurement body 16 friction force, made in the form of a strain gauge, glued to the holder-counter piece 2. The device works as follows. When testing ring specimens. The material 8 is laid between the punches 6 and 7 and a load is applied to the sleep pane 6. Under the action of the applied load, the punch 6 moves relative to the clip - counterpiece 2, the material 8 and the piston 7 with piston 10 move from the cylinder. At the same time, the fluid from the cavity of the hydraulic cylinder 12 flows through the valve 14 into the supporting cylinder of the hydraulic cylinder 11, displacing the piston 9 with the plunger 4 to the upper position. The force of deformation (compression) of the material 8 is controlled by the valve 14. After testing the ring sample between the punches 3 and 4, the test material 8 is installed as a cylindrical sample, a load is applied to the plug 3, with which it is loaded and moved relative to the holder-counterblade material 8. At the same time, the liquid from the hydraulic cylinder 11 flows into the hydraulic cylinder 12. After testing the cylindrical sample, the device is ready for testing the ring sample. The thrust force, both when testing annular and direct tests of cylindrical specimens, is determined with the aid of gauge 16. The specimen deformation force is determined by the indications of manometers connected to the holders of hydraulic cylinders I and 12. For compactness, hydraulic cylinders 11 and 12 can be Replaced with one twin hydraulic cylinder with two floating pistons, and piston rods can be combined with: supporting punches 4 and 7, the sleeve 5 can be attached to one of the punches 6 or 7, or carried out together with them. Apparatus of the Invention A device for determining the use of friction, materials during deformation, comprising a base, a counterbrack mounted on it, mounted inside the cage, a loading and supporting punch, forming between them a cavity for the test material, a loading unit that interacts with the loading punch, and a measuring force of friction , characterized in that, in order to expand the range of tested specimens, it is provided with an additional clip, covering the clip sample with a gap, additional loading and supporting annular punches installed between clips and forming between themselves a cavity for the material being tested, fixed hydraulic cylinders on a D18um base, the piston cavities of which are interconnected with each other with a throttling device, one of the supporting punches is connected to one hydraulic cylinder and the other is connected another hydraulic cylinder. Sources of information taken into account in the examination 1. The author's certificate of the USSR N «252692, cl. G 01 N 19/02, 1962. 2. USSR author's certificate N 121584, cl. GO L 1/04, 1959. (prototype).