SU1328737A1 - Device for investigating properties of surface layers of materials - Google Patents

Abstract

The invention relates to a test apparatus, in particular to devices for examining the properties of materials in hardness. The aim of the invention is to expand the operational capabilities by increasing the ranges of workloads. The device. contains the indenter 3, the loading device in the form of bellows 4, the sensors 16 and 17, respectively, of the load and the depth of the indenter. The mandrel is mounted coaxially on the bellows 4 with the possibility of fixation along it, and the matching surface of the mandrel is identical to the shape of the corrugation of the bellows 4. 1 Cp f-ly, -2 ill. (n. i

Description

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The invention relates to testing equipment, in particular to devices for studying the properties of materials by hardness.

The purpose of the invention is to expand the operational capabilities by increasing the ranges of workloads.

. FIG. Figure 1 shows the kinematic diagram of the instrument; in fig. 2 - loading node.

The device for studying the properties of the surface layers of materials contains a two-coordinate rotary table 1 for installing the sample 2 indenter 3 rigidly connected to the thin-walled bellows 4, which is housed in the housing 5. The bellows 4 is clamped around the circumference by a split mandrel 6 fixed by the shoulder 7 and two locking screws 8, and the shape of the mating surface of the mandrel 6 is identical to the shape of the corrugation sill background 4.

The pneumatic actuator of the device contains a micropneumatic engine 9, leak valves 10 and 11, electropneumatic valves 12 and 13, a reducer 14, a high-pressure cylinder 15. The load on the indenter 3 is measured by the sensor 16, and the depth of its introduction is determined by the sensor 17 of the depth of penetration, which is set in height by the slatted pair 18. Both sensors are balanced by screws 19 by turning them around the trunnions 20. The sensors 16 and 17 are electrically connected to the recorder 21. Place on sample

2d prints are selected using a microscope (not shown).

The device works as follows: The test sample 2 by turning the table 1 is placed under the lens of the microscope. After selecting the location of the imprint, the sample is returned under the indenter 3. The indenter 3 is brought to sample 2 by means of a slat pair, which is then locked with a lock. After installing the indenter

3, a coarse installation is made yes, the depth depth sensor 17 of the height 17 using a lath pair, which is also locked with a lock (not shown).

The screws 19 mechanically balance the sensors 16 and 17, turning them around the trunnions 20. The pneumatic motor is turned on by opening the electropneumatic valve 13,

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at the same time, compressed air through an injector 11 nocTynaijT into the working chamber of the engine. only the indenter reaches the sample surface, the bellows 4 will begin to deform in proportion to the load on the indenter 3. Sensors 16 and 17 are then fed to the input of the recording device 21, pro Q are the proportional deformations of the bellows 4 and the movement of the indenter 3, respectively. According to the diagram thus obtained, the mechanical properties of the materials are judged.

The indentation process is stopped by closing the electropneumatic valve 13. The indenter is unloaded by opening the electropneumatic valve 12. The indentation speed is adjusted.

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the indenter is carried out by changing

pressure on the top: ode gas gear 14 (roughly) and leak detector 11 (thin). Adjustment of the indenter unloading speed is carried out on the

5 Lem 10.

The design of the drive allows for separate control of the speed of indentation and unloading at any time at the command of the operator. The range of working loads on the indenter is controlled by changing the rigidity of the bellows 4 by changing the surface of fixing it in the split mandrel 6. To do this, locking screws 8 and the mandrel 6 together with the bellows 4 and the indenter 3 are loosened from the housing 5. Semi-rings. 6, they are inserted into the fold of one of the bellows of the bellows 4, depending on the required stiffness, until the mating surfaces fit snugly. Then the entire assembly is inserted into the housing 5 up to the stop of the side surface of the mandrel 6 in the flange 7 and pressed by locking screws 8, the ends of which abut against the surface of an annular conical groove made on the outer surface of the mandrel 6. Compressing the bellows 4 circumferentially increases its lateral rigidity, which further increases the accuracy of the device.

The design of the loading device, equipped with a split mandrel 6, allows to obtain a set of applied load ranges using a single bellows by changing its rigidity, which expands the operational capabilities of the device.

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Claims (2)

1. An instrument for examining the properties of surface layers of materials, including a pneumatic actuator, a housing, a loading device in the form of a bellows, an indenter associated with it, load sensors and indenter insertion depths, a microscope for selecting the location of the prints, and a recording device load and depth of indentation, associated with the sensors, about t characterized in that, with the aim of expanding operational capabilities by increasing the ranges of working loads, it is equipped with a split mandrel mounted coaxially on the bellows with the possibility of movement and fixation along it. 2. An apparatus according to claim 1, characterized in that the shape of the mating surface of the mandrel is identical to the shape of the bellows.  I Compiled by S. Barabanov Editor P. Gereshi Tehred M, Hodanich Proofreader M. Demchik Order 3479/47 Edition 776 Subscription VNIIPI USSR State Committee for Inventions and Discoveries 4/5, Moscow, Zh-35, Raushsk nab. 113035 Production and printing company, Uzhgorod, st. Project, 4 .2