SU1415117A1 - Method of testing specimen by compression - Google Patents

Abstract

The invention relates to a testing technique and can be used to select the optimal technological modes of deformation during the processing of materials pressure.m. The purpose of the invention is to expand the testing capability by determining the deformation resistance of the material of the die tool. Sample 1 of the material is set between the loading elements 2 and 3 of the test device, heated in the furnace 4 to a predetermined temperature, and deformed several times in a given temperature-strength mode with intermediate exposures. The deformation is carried out according to a program containing an alternation of static and shock effects. The impact is carried out as an additional effect on the statically loaded sample. After the impact, the deformation of the sample is kept constant. During exposure, the load on the sample is recorded and, based on its variation, it is judged on the resistance of the material to deformation. 1 il. e (L

Description

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The invention relates to a testing technique and can be used to select the optimum technological modes of deformation during the processing of materials by pressure.

The purpose of the invention is to expand the possibilities of testing by determining the deformation resistance of the material of the die tool.

The drawing shows a loading device for implementing an compression compression program.

The method is carried out as follows.

Sample 1 is installed between loading elements 2 and 3. Stamp tools are used as loading elements 2 and 3. Sample 1 and the loading elements 2 and 3 are placed in the working space of the furnace 4 and heated to predetermined high temperatures, therefore, water-cooled casings 5 are installed at the attachment points for the loading elements 2 and 3. To quickly change the sample 1, the loading element 2 is attached to plate 6 is a quick coupling 7. For measuring the loading forces, use the dose dozens 8.

Sample 1 is heated to a predetermined temperature, deformed with hardening by static compression, and kept in a compressed state until the material softening of the sample is developed. After exposure, the statically loaded sample is additionally deformed by a blow, the deformation of the sample after the impact is kept constant, and the change in the load on the sample is recorded.

The deformation is carried out through the cams 9 and 10 placed in the bores 11 and 12 of the housing 13. In the bores 11 and 12, the damper 14 and the spring-loaded cam followers 15 and 16 are also set to their original position. The axis of the loading elements 2 and 3 in the housing 13 has holes made in which the followers 17 and 18 are placed. The follower 18 is supported on the plate 19, which is connected to the plate 6 through the columns 20. On the columns 20 between the plate 19 and the case 13 installed gaskets 21.

In the initial position, the cams 9 and 10 are omitted. Static deformation is performed by the cam 9 through the pusher 18 connected to the plate 19. The plate 19 is displaced to the right and through the columns 20 moves the plate 6 with the loading element 2 installed on it. The compression force is closed through the pusher 17 supported on the body 13. The compression force transmitted via

space doses 8 are recorded. Dynamic loading is carried out with a predetermined impact energy. For this, the cam 10 is moved upwards by a hydraulic impulse and the pusher 17 transfers the impact force to the loading member 3. The impact force is closed between the plate 6, the columns 20, the plate 19, the pusher 18, the cam 9 and the body 13. After the impact, the deformation is kept to a predetermined deformation sample 1 is constant due to the self-braking of the cam 10. In the process of holding after the impact, the load on the sample 1 is recorded with the help of the masses 8 and according to its change it is judged on the resistance of the material to deformation.

The loading of sample 1 is carried out multiple times, a series of static and shock effects according to a given program. Loading options are possible when the initial loading is shock loading, i.e. the impact is carried out with zero static force.

Example. A sample of steel. ST.35 stamps with a diameter of 10 mm and a height of 10 mm were tested by compression at 1273 °. At first, the sample was precipitated with a static force of 950H with a strain rate of 0.2 ° C until deformation 01. The sample was kept at this strain. Due to the weakening of the compression force decreased to 430N. Impact loading is carried out by a impact energy of 90 J at a deformation rate of 100 ° C to a deformation of 0.1. The force reached 1500 N and decreased due to softening during subsequent exposure to 1100 N.

Claims (1)

Invention Formula The method of testing a sample of material by compression to determine the resistance of high-temperature re-deformation, according to which the sample is placed between the loading elements of the test device, heated to a predetermined temperature, repeatedly deforms the sample in a given temperature-strength mode with intermediate exposures under static load, register the load on the sample and its change is judged on the resistance of the material to deformation, characterized in that, in order to improve the possibilities and testing by determining the resistance to deformation of the material of the stamped tool; it additionally deforms the loaded specimen by impact and maintains the deformation of the specimen after the impact is constant.