SU836566A1 - Device for measuring material microhardness - Google Patents

Description

(54) DEVICE FOR MEASURING THE MICRO-TURNESS OF MATERIALS

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The invention relates to a device for measuring hardness by inserting an indenter.

The closest to the invention to the technical essence and the achieved effect is a device for measuring microhardness materials, containing a base, a table installed on it to accommodate the material under investigation, an indented equal arm, an indenter fixed to the base, and an indenter rigidly connected to the large arm of the rocker. and interacting with the test material in the measurement process, and the measurement system l.

However, this device has a limited range of speeds; 1: 1 load due to the complexity of the mechanism for controlling the application of the load.

The purpose of the invention is to expand the range of loads.

The goal is achieved by the fact that the device is equipped with two electric capacitors installed respectively on the arms of the rocker arm, and a hydrodynamic system connected to them.

The drawing schematically shows the proposed device. It contains a base 1, a table 2 for placing a sample 3 from a research material, a loading unit in the form of a razor arm 4, an indenter 5, a measurement system 6, two electric condensers 7 and 8 and a hydraulic system made in the form of a container 9 with fluid, hoses 10, electromagnetic valves 11 and cranes 12. Yoke 4

0 is fixed on the axis 13 with the possibility of rotation around it and in contact with the eccentric 14.

The device works as follows. Sample 3 set under.

5 an indenter 5. The eccentric 14 rotates 180, the yoke 4 rotates unbalanced clockwise around the axis 13 installed in the bearing, and the indenter 5 co0 touches the sample 3.

Since the imbalance of the rocker arm 4 is in the order of 50-100 mg, the penetration of the indenter 5 into sample 3 is small. After

5 this opens the first solenoid valve 11, and the liquid begins to flow through the hose 10 into the electrocondenser 8. The valve 12 serves to adjust the flow rate of the fluid. The liquid level in the container 9 is maintained automatically constant, as a result of which the flow rate of the liquid into the electric capacitor 8 is constant and the load on the sample 3 increases linearly with time. From the measurement system 6, the readings of the capacitive displacement sensor 15, which characterizes the depth of the indenter 5 in sample 3, and the recording of the capacitance of the electric capacitor 8, which indicates the value of the applied load, are recorded. When the set value of the load is reached, the first electromagnetic wind 11 closes and the supply of liquid to the electric capacitor 8 stops. The second electromagnetic valve 11 opens / the liquid starts to move E to the electric condenser 7. The load is gradually released. This measurement topic 6 registers the process of lifting the indenter 5 when lifting n & After unloading, the eccentric 14 returns to its original position. The liquid from the cylindrical capacitors 7 and 8 is poured into the cotainer 9. The measurement process is repeated.

Claims (1)

12 The positive effect of the invention is that the use of a hydraulic loading mechanism significantly expands the range of applied loads. Apparatus of the Invention A device for measuring the microhardness of materials, comprising a base, a table mounted on it to accommodate the material under test, a loading unit secured on the base, made in the form of a razor arm arm, an indenter rigidly connected to the large arm of the rocker arm and interacting with the material under investigation and a measurement system that, in order to expand the range of loads, it is equipped with two electrocondensators installed respectively on the arms ah rocker, and the hydraulic system connected to them. Sources of information taken into account in the examination 1. US Patent No. 3681979, cl. 73-81, 1972 (prototype).