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Investigating the Possibility of Regenearation by Hardfacing for Forging Tools Based on Analysis of Tool Working Conditions and Wear Evaluationy

Widomski Paweł, Kaszuba Marcin, Krawczyk Jakub, Nowak Bartłomiej, Lange Artur, Sokołowski Paweł, Gronostajski Zbigniew

Archives of Metallurgy and Materials

2022

Vol. 67, iss. 4

1395--1410

Tests were performed on example tools applied in hot die forging processes. After withdrawal from service due to excessive wear, these tools can be regenerated for re-use through machining and hardfacing. First, analysis of worn tools was carried out for the purpose of identifying tool working conditions and wear mechanisms occurring in the surface layer of tools during forging. Testing of worn tools included observations under a microscope, surface scanning and microhardness measurement in the surface layer. The results indicate very diverse work conditions, which suggest the application of different materials and hardfacing tool regeneration technology in individual die forging processes.

The application of a new, innovative, hybrid technology combining hardfacing and nitriding to increase the durability of forging tools

Kaszuba Marcin

Archives of Civil and Mechanical Engineering

2020

Vol. 20, no. 4

354--366

The article deals with the wear of forging tools used in hot forging processes. The research presented in the work includes analysis of tool life used in a selected industrial hot die forging process. Multiple treatment variants were used to increase wear resistance, including thermo-chemical treatment (nitriding), welding methods (surfacing) and an innovative new hybrid technology combining surfacing and nitriding. First of all, the research focused on determining the impact of the phase structure of the nitrided layers used and the surfacing layer on resistance to destructive factors occurring in the analyzed process. Next, hybrid treated tools combining surfacing and nitriding were also subjected to operational tests. Each of the tools analyzed in this work was operated until it was withdrawn due to excessive wear, and then subjected to comprehensive analysis. The tests of tools after operation included: surface scanning to determine the amount of wear of the analyzed tools after work, microhardness measurement, and microscopic tests. A detailed analysis of changes in the surface layer of tools in selected areas was made using a scanning microscope. The aim of the study was to assess the effectiveness of the hybrid surface treatment process used to increase the wear resistance of the surface layer of tools and thereby improve the durability of the forged tools analyzed. The obtained research results indicate a beneficial effect of using the new technology resulting in 300% increase in the durability of the analyzed tools. The effect of improving durability confirmed by obtained results arises from the use of hybrid layers, which are more resistant to abrasive wear and to cracking due to thermo-mechanical fatigue. Moreover, the study shows that nitriding may have a beneficial influence on improving the lifetime of forging tools, under the condition that the nitrided layer has an α diffusive layer structure, without a larger amount of γ’ and ε nitride precipitates.

Badania eksploatacyjne narzędzi kuźniczych do pracy na gorąco poddanych laserowej obróbce cieplnej

Gierzyńska-Dolna M., Szyndler R., Plewiński A., Pachutko B., Ziółkiewicz S., Garczyński Z.

Problemy Eksploatacji

2005

nr 4

139--149

Referat prezentuje wyniki badań prowadzonych w Instytucie Obróbki Plastycznej, dotyczących trwałości narzędzi do obróbki plastycznej na gorąco. Trwałość narzędzi kuźniczych wykonanych ze stali do pracy na gorąco zwiększono przez uszlachetnienie powierzchni roboczych laserową obróbką cieplną. Przeprowadzono badania porównawcze wytrzymałości zmęczeniowej, udarnościowej i cieplno-mechanicznej warstwy wierzchniej, mikrostruktury i rozkładu twardości. Do badań eksploatacyjnych wytypowano wkładki matrycowe wykonane ze stali WCL, wykorzystywane w procesie kucia na gorąco w przyrządach TR odkuwek zaczepu budowlanego T-Slotanker 5T. Przeprowadzono badania przemysłowe na stanowisku produkcyjnym. W porównaniu do tradycyjnych wkładek TR uzyskano prawie trzykrotny wzrost trwałości wkładek obrabianych laserowo.

Paper presents results of tool life for hot metal forming investigation realised in Metal Forming Institute. Attempts have been made to improve the durability of forging tools by laser heat treatment of their working surfaces. The impact and thermo-mechanical testing, microstructure and hardness distribution have been carried out. For exploitation testing, die inserts of TR device for hot upsetting of the ends of the building anchor T-Slotanker 5T has been selected. Industrial test was performed on the production stand. In the case of laser hardened inserts has received around three times longer tool life comparing to traditional once.