The main reasons for decreased service times of selected nitrided and CrN coated dies were revealed and explained. Results of analysis of wear on industrial dies were combined with results obtained in laboratory wear tests. The main influential parameters in this study refer to contact pressure, die design, length of bearing surface, quality of nitrided or CrN layer, surface preparation prior coating and maintenance. It was found that lower quality of nitrided layer in combination with short bearing surface and occurrence of increased contact pressure close to exit edge of bearing surface can considerably decrease die service time and that appropriate shaping of die contours around inlet and outlet areas of bearing surface has decisive influence on die service time.
F.05 Ability to launch new technological development cycle
COBISS.SI-ID: 1489247Exstensive development of monitoring system for the failure detection which ofen grave tool steel inserts during the injection molding cycle has been conducted aiming at optimization and improvement of this technologicaly very important process. The obtained results revealed that such a system could be used successfully as an improved tool for monitoring the integrity of an injection molding process.
F.17 Transfer of existing technologies, know-how, methods and procedures into practice
COBISS.SI-ID: 13398811The conference was divided into three sections: Section 1: Polymer Technologies Section 2: Heat Treatment Section 3: Metal Working Main objective of this international conference is provideing a platform for exchange of information and knowledge about recent developments and state-of-the-art innovations in tool manufacturing and material processing technologies.
B.01 Organiser of a scientific meeting
COBISS.SI-ID: 273093888The problem of production of gradient castings has been addressed. The technology of production is a combination of the horizontal centrifugal casting of alloyed white cast iron (two sequences) and gravity casting of cores which occurs in third sequence. Working layer of the roll is made from chromium alloyed white cast iron. The core is made by spheroidal graphite cast iron (SGI). The main focus was on intermediate layer, which is made from flake graphite cast iron. Using numerical simulations the density of each microstructural constituent was determined. It was found that austenite and M7C3 type of carbides have difference in density for approximately 0,3 kg/dm3 which influences on the distribution of microstructural constituents in roll cross-section due to centrifugal forces.
F.06 Development of a new product
COBISS.SI-ID: 1501279Cooling process of the work rolls is one of the most difficult tasks during hot rolling. Their surface is exposed to rapid temperature change due to the contact with hot rolled material and cooling with water sprays. If cooling is not intensive enough, wear of rolls and fire cracks appear. Fire cracks can appear after only a few turns of rolls, starting on the surface and grow perpendicular to the surface of the rolls. Intensity of growth and depth of cracks mostly depend on temperature gradient during alternating heating and cooling. In order to better understand the conditions leading to cracking intensive testing of materials has been employed using in house developed thermal fatigue equipment. Resulst reperesent tha basics for the development of appropriate gradation of properties of rolls.
F.07 Improvements to an existing product
COBISS.SI-ID: 1476191