Open Information and Computer Integrated Technologies

The article contains analysis of the uneven cemented layer effect upon the bearing capacity of the base and supporting parts of versatile prefabricated welded work tools. The issue was studied as there is a lack of data on contact deformations, which are necessary for further calculation of assembly errors due to thermal deformations. Fluctuations of the cemented layer depth along the base part surface negatively affect the contact of the tool base surfaces. This issue is especially acute when expanding the scope of application of reconfigurable reusable technological equipment, which would be cost-effective in terms of serial multi-item production of welded structures.

The relation between microhardness and the value of the polished cemented layer was determined during testing of 12 ХН3А steel samples, cemented to a depth of 2.4 mm and hardened to a hardness of HRC 60-62. Obtained relation between the microhardness and polished layer thickness has shown that with increasing polished layer, the microhardness decreases. This leads to a decrease in the critical load, under which recoverable deformations of irregularities transit into plastic deformations. The ratio of the actual planes of contact, where the recoverable deformation of microroughnesses appoears when approaching and penetration of harder irregularities into soft ones occurs, will be proportional to the ratio of the nominal planes of the cemented and raw layers.

As a result of processing the test data, the relation between critical pressure and cemented layer thickness has been got. Microroughnesses at lower loads will be deformed plastically, reducing the bearing capacity of base surfaces, which is unacceptable for parts of tools and affects their service life. It follows from the above that the unevenness of the cemented layer depth of the front surfaces of the base and supporting parts is a negative phenomenon that impairs their performance. It is necessary to use a process that ensures minimal distortion of the part during heat treatment and a stable depth of the cemented layer.

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