SU742740A1 - Apparatus for endurance testing - Google Patents

Description

one

The invention relates to testing machines, in particular for testing die dies for durability.

A known installation for carrying out stochastic tests, comprising a press, the slide of which is provided with clips for the test piece, as well as a coaxially arranged hydropneumatic pad 1.

A disadvantage of the known installation is the low accuracy of the tests performed, while it is impossible to change the test program in a short time.

The purpose of the invention is to eliminate this drawback, namely, to increase the accuracy of tests.

This goal is achieved by the fact that the installation is equipped with a drive table mounted with the possibility of periodic rotation around a vertical axis offset by the relative axis of the slide, with adjustable inserts with surfaces shaped in the table evenly around the circumference.

The inserts are mounted in spring-loaded supports mounted for movement in the direction of movement of the slide.

FIG. 1 shows the installation, general view; in fig. 2 - the same, during the loading period of the test punch; in fig. 3 is a view A of FIG. one; in fig. 4 - an unintended punch with one of the installation units; in fig. 5 shows a program whereby the punch on all the inserts is loaded with a predetermined

10 by force P at a 0; in fig. 6 - on the inserts, corresponding to an odd number, and “O, and on the inserts, corresponding to an even number n and O, and the direction of the bevels is the same; in fig. 7 - on all the inserts aO, but the change in the direction of the bevel is carried out alternately in diametrically opposite directions; in fig. 8 - also on all inserts aO, but the directivity changes by 180 ° in the planes lying under the fragile

Claims (2)

20 90 ° to each other; in fig. 9 - on the inserts, the number of which is n I, 2, 3 a О, and on the other inserts n 4-8, and 0 and the direction of the rocib citoca varies uniformly within 3 angles of 180 °; in fig. 10 - on all the inserts aO the directionality of the bevel will successively vary uniformly within the bang 360. The installation is a press, on the slider 1 of which clamps are fixed for the test punch 2. In the table 3 of this press there is a hydropneumatic plate containing a cylinder 4 and a plunger 5. On the table 3, a shaft 6 is installed, on which a table 7 is mounted with the possibility of periodically turning to a predetermined angle from the drive (not shown) in the drawing. In the table 7, through holes were mounted evenly around the circumference; in KOTopbix they were mounted with The ability of the longitudinal (axial) movement of the support 8, the shoulders of which are spring-loaded with cup springs. Each support 8 is fixed against rotation around its axis with the aid of a key. In the blind hole of each support 8, an adjustable insert 9 is installed. The end of the inserts 9, which is in contact with the test punch 2 when tested, is made oblique at a given angle a) to the horizontal plane. The directivity of the bevel at an angle a, as shown by the arrows in FIG. 3, is achieved by installing an insert 9 in the support position in the support 8, which is fixed by any known means, for example, locking pins or performing a cross-section of a blind hole in the supports 8 and a cross-section of a polygon plate (for example, in the form of a hexagon, as shown in FIG. . four). Before starting the tests, the inserts are installed in blind holes and fixed in a predetermined position so that the bevel direction on the inserts corresponds to the test program determined by the operating conditions, size and technological purpose of the test punch. Part of the inserts may not have bevels (a 0). Prn each stroke of the press with a punch down the end of the punch meets the working end of insert 9. The latter together with the base plate squeezes the plunger 5, overcoming the fluid pressure in the cylinder 4. At the same time, the test punch overcomes the force P, the direction of which either coincides with its longitudinal axis at and O, or does not coincide with this axis at a 0. In the latter case, the point of application of shl p is shifted from the axis by the value of eccentricity e, depending on i from angle a, and the direction of force P p is located at an angle to the same axis. This will lead to the appearance of a horizontal component of force P, the magnitude of which depends on e and a, and thus to the modeling of the actual working conditions of the punch, characterized by its length and transverse bends. When testing the pressure in the cylinder. and, consequently, the magnitude of the force P, the course of release of the support and, consequently, the size of the gap a, the magnitude of the angle a are determined based on the specified program (mode) for testing the punch, the dimensions and material of the punch, the conditions of its operation, taking into account that the deformation of the test the punch should be in an elastic region. This allows the set test mode (program) of the punch to be as close as possible to the real mode (condition) of operation of the same punch. After raising the slider, the pressed plunger will take the upper position under the action of the pressure of the fluid in the cylinder, and the support will also return to the upper initial position under the action of the springs, as a result of which the gap between the slider and the base plate will be restored. After this gap has been formed, the table 7 is rotated by an angle until the axis of the test punch coincides with the axis of the next base plate, and thus the axis of the insert. After this, the next loading of the punch is performed. In this manner, cyclic durability tests of the punch are performed by compressing it with longitudinal and transverse bending. In this case, the test mode is as close as possible to the conditions of operation of the punch. Sequential loading of the punch is carried out with continuous press strokes or with single ones. Such a test is performed before the punch is destroyed. At the same time, the test mode is as close as possible to the conditions of operation of the punch, since in the process of operation the punch perceives both compressive and bending forces. The use of the installation allows to increase the accuracy of determining the resistance of the punches, to establish their optimal dimensions and shape, taking into account the mode of operation. Based on the test results, it is possible to make design changes and replace the material of the used punches in order to increase their durability. Claim 1. Stability test apparatus comprising a press, the slider of which is provided with clamps for the part to be tested, as well as coaxially arranged hydropneumatic cushion, characterized in that, with the purpose of increasing the accuracy of testing, it is equipped with a driving table mounted with the possibility of periodic rotation in 5 1 vertical axis, displaced relative to the axis of the slider while in the table evenly around the circumference are placed adjustable iscTSBKH with profiled working surfaces. 2. Installation according to claim 1, characterized in that the inserts are mounted in sub-spring-loaded supports mounted for movement in the direction of movement of the slide. Sources of information taken into account during the examination 1. Automotive industry, 1961, No. 3, p. 42-43.  f vz 0w. /