SU914964A1 - Device for testing circular specimens for compression - Google Patents

Description

The invention relates to testing the strength of materials, namely, devices for testing the compression of ring specimens.

A device for testing ring specimens for compression, containing a support, a matrix mounted on it with a tapered bore for accommodating a test specimen inside it, and a punch is known.

The disadvantage of this device is the presence of a gap between the working surface of the punch and the conical surface of the matrix, which causes uneven compression ring shaped, due to the bending of its outer edge into the gap.

The purpose of the invention is to improve the accuracy of the test by eliminating the outer edge of the annular sample.

This goal is achieved by hem, that on the side surface of the punch at its working end are ledges, and

2

The device is equipped with sliding segments mounted on the ledges, 'spring-loaded with respect to the punch in the radial direction.

FIG. 1 shows a diagram of the device, a general view; in fig. 2 - punch with segments, bottom view.

The device contains a support I, a matrix 2 mounted on it with a tapered hole 3 to accommodate the test ring sample 4, and a punch 5, on the side surface of which, at its working thorium, steps 6 are made. The device includes sliding segments 7 mounted on the steps 6 and spring-loaded relative to the punch 5 in the radial direction with the help of springs 8, which are installed in the corresponding undercut 9, 10 of the punch 5 and segments 7. The connection of the punch 5 s. segments 7 is provided with a gap 11 and is carried out by screws 12, which pass through segments 7 and

3 91

screwed into the punch 5 until the stop of the screw head 12 into the surface of the recess 13.

To ensure a strictly radial movement of the segments 7, pins 14 are provided, one end of each of which is pressed into the punch 5, and the other moves in the guide holes 15 of the segments 7.

The device contains a stop 16 for placement of the test sample 4 and pressed by the shock absorber 17 using the pushers 18.

The device works as follows.

Sample 4 is placed in the tapered hole 3 of the matrix 2 on the anvil 16, pressed by the shock absorber 17. On top of the sample 4 set the punch 5, segments 7 which, pressing the spacer springs 8, tightly without a gap adjacent to the side surface of the tapered hole 3 of the matrix 2.

The device will be placed between the upper and lower table of the press and testing machine (not shown). The squeezing force is transmitted through the punch 5 to sample 4, which is mixed together.

the board.

16, down the matrix squeeze in cone 2, is experiencing radial on—

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FIG. one

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In this segment 7, moving

in the radial direction, tight to the side surface of the matrix and constantly in contact with the entire face -

5, the device for testing ring specimens eliminates the occurrence of bending forces along the contour of the sample and ensures uniformity of compressive forces.

Claims (1)

Claim , 5 A device for testing the compression of ring specimens, containing a support, a matrix mounted on it with a tapered hole to accommodate a test specimen of the test specimen and a sleeping pad, is different because the side surface of the punch at his worker 25 ends, ledges are made, and the device is equipped with sliding segments mounted on the ledges, spring-loaded with respect to the punch in the radial direction. thirty