SU1402838A1 - Installation for investigating electric placticity of metal specimens under impulse loads - Google Patents

Abstract

The invention relates to devices for testing samples by pulsed loads and can be used to study the plastic and electroplastic properties of materials. The aim of the invention is to improve the accuracy, which is provided by synchronizing an electric pulse with a load pulse. The test sample 6 is fixed between the fixed and movable grippers 2, 5 with insulators 4 and current lead 3 mounted on them. The movable gripper 5 is attached to a cantilever beam 7 mounted on a movable cross bar 23, which creates a static load on the sample 6 controlled by a strain gauge 24. The end of the beam 7 is in contact with the movable wedge 8 installed in the support body 9 and in contact with the eccentric 11 through the roller 10 to transfer the loading force to the sample 6 produced by the electric motor 22. The source 19 is electric Pulse delivers electrical pulses to the sample 6. Adjust the pulse magnitude of mechanical load. 2 Il. e (L

Description

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The invention relates to devices for testing specimens with pulsed loads and can be used in dgs to study the plastic and electroplastic properties of materials.

The purpose of the invention is to increase the loading accuracy due to synchronization of an electric pulse with a load pulse,

Fig, 1 shows the proposed installation, a general view; Fig, 2 - section aa in figure 1,

i The installation contains a frame 1, in the upper part of which there is a fixed- | 1dv} -Ganny grip 2 with a collector 3 and an insulator 4; A movable grip 5 with a collector 3, an insulator 4 and sample 6, is fixed on the cantilever beam t. The end of the cantilever beam interacts with the beveled part of the self-locking wedge 8 installed in the bore case 9. At the end of the wedge 8 1 through a pulley 13 with a disk 14, on the face of which the surfaces C are fixed; the programs can be moved; NEW CAMS 15 and 16; Each cam touches a corresponding switch of bodies 17 and 18, one of which is connected to a source of 19 electrical shtulsoVg-a the other - with an electromagnet - H11TNAYA Jyfty 20, is located minutes at a; shu 21, having a kinematic linkages with: an electric motor 22,

Console beam 7, support box

 9, the shaft 12 and the electric motor 22 are mounted on the movable cross member 23 p0 and are directed to the thick housing 9. On the beam 7, load-resistive strain gages 24 are installed.

The installation works as follows

Investigates a sample 6 clamped in a fixed 2 and moving 5 grippers. Set the eccentric 11 in the positions of the maximum gap between it and the roller 10 of the wedge 8.

The size of the gap is determined by the pause of the mesa (this is the switching on of the power supply source and the loading mechanism.

A static load is created by moving the cross bar 23. The static load value is chosen beyond the elastic deformation region,

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which is fixed with strain gauges 24,

The sample elongation value is fixed by the deformation of the flat cantilever springs, which contact their ends with the grippers 2 and 5 by means of glued strain gauges (a device for measuring the elongation is not shown)

The motor 22 is turned on, the shaft 21 that rotates, and then the electromagnetic clutch 20 is transmitted, which transmits the rotation to the shaft 12, the Eccentric 11 attaches the roller 10 of the wedge 8 and displaces the latter in the direction of the beam 7. - the movable gripper 5, which stretches the sample 6, is attached to it. The magnitude of the additional force is recorded with the help of strain gauges 24, and the elongation - with a device for measuring the elongation.

The rotation of the shaft 12 through the pulley 13 is transmitted to the disk 14, one of the software cams 15 of which turns on by means of the switch 18 a source 19 of electrical pulses, which, through the current leads 3, supplies pulses of electrical current to the test sample b.

Software cam 16 of the disk 14 through the switch 17 causes the shutdown of the electromagnetic clutch 20.

The moment of switching on the source 19 of electric pulses by switching the software cam 16 is changed. The duration of switching on the latter is set by a time relay.

The magnitude of the pulsed mechanical load is governed by the magnitude of the initial gap between the Kli roller 10 - 8 and the surface of the eccentric 11. The gap is changed by moving the shaft 12 along the wedge 8 movement line.

Claims (1)

Invention Formula An installation for investigating the electroplasticity of metal samples under impulsive loads, containing a movable base, a movable and stationary electrically insulated grippers with an axis perpendicular to the base, current leads, a source of electrical i-pulses with a switch and a device for creating axial load on the sample , characterized in that, in order to increase the accuracy on. loaded due to the synchronization of an electric pulse with a load pulse, the movable gripper is connected to the base by means of a cantilever mounted on the base of an elastic beam, and the installation is equipped with a wedge with the end of the beam; cams, one of which interacts with a source switch of electrical impulses and an additional switch connected clamping element, working surface with an electric coupling and connected with which is intended for the co-mods Vtor- software cam. L X