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Comparative analysis of wear mechanism of different types of forging dies

Mazurkiewicz A., Smolik J.

Archives of Materials Science and Engineering

2011

Vol. 49, nr 1

40-45

Purpose: Hot working dies are influenced by three main factors causing their destruction: the cyclically changeable mechanical loads, intensive thermal shocks, as well as intensive friction, and erosion. The great variety of the shapes of forgings, the material they are made of (carbon steel, alloy steel, brass) and the precision of their production – whether they are supposed to undergo further treatment or are considered to be the final products – result in a variety of problems encountered in the production process. In this paper the wear mechanisms of different types of forging dies, covered by the composite layer “nitride layer / PVD coating” were analysed. Design/methodology/approach: In order to estimate the influence of the different shapes of forgings for their wear mechanism, it was decided to that maintenance tests on two series of tools with different shapes made of DIN 1.2344 steel, coated with composite layer “nitrided layer/CrN coating” needed to be taken. The first one was designed for production of gears pre-forging and the second one was designed for the production of steel synchronizer rings. Findings: The abrasive wear together with thermal-mechanical fatigue and plastic strain is a crucial factor of the process of wearing of forging dies for the production of forgings with high dimensional accuracy and not subject to further mechanical treatment. The variety of the shapes of the forging and the precision with which it is made have strong influence on the intensity of the abrasive wear of forging dies. Research limitations/implications: To ensure higher effectiveness of the application of hybrid technologies of surface treatment for the increase of the durability of forging dies, the complex analysis of the influence of such various aspects of the forging process as: surface treatment, the shape of the die and the cooling and lubricating system are necessary on the development of a new generation of dies with increased operational durability. Practical implications: The obtained results of the tests have been practically applied in the FA “Swarzędz” enterprise to increase the durability of the forging dies for steel synchronizer rings. Originality/value: In order to ensure a required level of effectiveness of the use of layered composites of the “nitrided layer/ PVD coating” type for the increase in the durability of forging dies, it is necessary to properly select the composites on the basis of the analysis of the intensity of forging dies wear mechanisms.

Podwyższanie trwałości matryc kuźniczych obróbką laserową

Panczenko W. J., Wasilcow W., Golubew W. S., Iliczew I. N., Sawenkow W. A., Sziganow I. N., Misurow A. I., Safonowa E. A., Plewiński A., Ziółkiewicz S., Gierzyńska-Dolna M., Szyndler R.

Obróbka Plastyczna Metali

2003

T. 14, nr 1

57-64

W artykule opisano wyniki badań nad podwyższeniem trwałości matryc kuźniczych, przez zastosowanie różnych metod obróbki laserowej: wstępnym hartowaniem i odpuszczaniem, napawaniem proszkami oraz stopowaniem borem amorficznym. Omówiono zastosowane metody oraz wyniki badań trwałości, badań zmęczeniowych, a także odporności na zużycie. We wniosku podkreślono wyższość stopowania borem nad innymi metodami. Badania prowadzono w jednostkach naukowo-badawczych Polski i Rosji w ramach Projektu Międzynarodowego GEFEST.

The article describes the results of investigations of forging die life extension by the use of various laser treatment methods: pre-hardening and tempering, powder pad welding and amorphous boron alloying. The application of the method , as well as the results of life examinations, fatigue tests and wear tests have been discussed. In the conclusion, superiority of boron alloying to other methods has been emphasized. The investigation has been carried out by scientific and research enterprises of Poland and Russia within the International Project, GEFEST.