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Analiza trwałości wkładek matrycowych do kucia na gorąco widłaka wykonanych ze stali 1.2343 i UNIMAX

Gronostajski Z., Widomski P., Kaszuba M.

Rudy i Metale Nieżelazne Recykling

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2018

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R. 63, nr 8

9--18

PL

Artykuł dotyczy zagadnienia trwałości narzędzi kuźniczych stosowanych w przemysłowym procesie kucia na gorąco. W pracy opisano próbę poprawy trwałości narzędzi przez dobór materiału narzędziowego. W pierwszej kolejności dokonano dokładnej analizy warunków pracy badanych narzędzi. W tym celu wykonano pomiary termowizyjne oraz przeprowadzono modelowanie numeryczne analizowanego procesu. Następnie przeprowadzono szczegółową analizę zużytych narzędzi wykonanych z obecnie stosowanej stali 1.2343. Na podstawie uzyskanych wyników i obserwowanego zużycia, podjęto decyzję o doborze innej stali narzędziowej o handlowej nazwie UNIMAX. W czasie testów eksploatacyjnych narzędzia wykonane ze stali UNIMAX umożliwiły kucie dwukrotnie większej liczby odkuwek. Ostatecznie efekt zwiększenia trwałości zweryfikowano przez przeprowadzenie kompleksowych badań narzędzi po ich eksploatacji. Badania te obejmowały: pomiar geometrii zużycia przez skanowanie 3D, badania mikroskopowe optyczne i SEM oraz badania mikrotwardości.

EN

This manuscript covers the results of the tool durability test performed to evaluate the tool’s material impact on the wear resistance of die inserts used in industrial hot forging process. First, the parameters of the forging process were measured and determined by FEM simulations to identify the working conditions of tools in the selected forging process. Next, the commonly used tools made 1.2343 steel were analyzed, because of its too low durability. For the purpose of comprehensive analysis of tool wear the 3D measurement was done using the measuring arm Romer Absolute 7520SI with RS3 laser scanner. Authors performed microscopic and SEM wear analysis to understand the reason of occurring wear. Base on the obtained results, the original steel material was replaced by different tool steel with the name Unimax, being produced by Böhler Uddeholm. Tools made of new material allowed to produce double number of forgings (16 000 pcs.), thanks to much higher durability. This effect was tested on many tools, from which one representative was selected for detailed investigations. Ultimately, the effect of increased durability was verified by carrying out comprehensive testing of selected tool made of Unimax and comparing it to the tool made of 1.2343 steel after finishing their exploitation. These tests included measurements of geometric wear by 3D scanning, optical and SEM microscopy and microhardness tests. The study explained the reasons for the increase in durability due to the material properties of the tool steels as well as the effectiveness of the applied heat treatments.

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Foresight methods application for evaluating laser treatment of hot-work steels

Dobrzańska-Danikiewicz A. D., Jonda E., Labisz K.

Journal of Achievements in Materials and Manufacturing Engineering

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2010

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Vol. 43, nr 2

750--773

EN

Purpose: The purpose of this article is to evaluate the strategic growth perspectives of laser treatment of X40CrMoV5-1 and 32CrMoV12-28 hot-work alloy tool steels using NbC, TaC, TiC, VC and WC carbide powders. The criterion assumed for dividing the technologies into groups was the powder type; thus, five groups were selected to realised researches. Design/methodology/approach: As a part of the foresight-materials science researches, a dendrological matrix of technology value, a meteorological matrix of environment influence, and a matrix of strategies for technologies were elaborated, the strategic development tracks were determined, and materials science experiments were conducted using a scanning electron microscope, an optical microscope, a transmission electron microscope, a microhardness tester, a scratch tester, an X-ray diffractometer, an electron microprobe X-ray analyzer and a device for testing of heat fatigue and abrasive resistance. Also, technology roadmaps were prepared. Findings: The researches conducted demonstrated huge potential and attractiveness of the analyzed technologies, compared to others, and the promising properties improvement of the tested surface layers, as a result of laser surface treatment. Research limitations/implications: Researches concerning laser treatment of hot-work alloy tool steels constitute a part of a larger research project aimed at identifying, researching, and characterizing the priority innovative technologies in the field of materials surface engineering. Practical implications: The presented results of experimental materials science researches prove the significant positive impact of laser treatment on the structure and the properties of hot-work alloy tool steels, which justifies including them in the set of priority innovative technologies recommended for use in small and medium enterprises and in other business entities. Originality/value: The value of this article lies in the fact that it determines the value of laser treatment of hot-work alloy tool steels compared to other technologies and identifies the recommended strategic development tracks and technology roadmaps for them, taking into account the impact of such treatment on hardness, abrasion resistance, and coarseness of the tested surface layers.

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Możliwości podwyższania właściwości eksploatacyjnych stali narzędziowych przy wykorzystaniu procesów nawęglania

Babul T., Nakonieczny A., Senatorski J.

Inżynieria Powierzchni

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2006

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nr 2

3-8

PL

W artykule przedstawiono wyniki pomiarów zużycia przez tarcie stali narzędziowych do pracy na gorąco 4H5W2FS, AMS 6437E oraz stali do pracy na zimno ASTM A681, Ch12FS z umocnioną warstwą wierzchnią przez zastosowanie technologii nawęglania (Carbo). Proces nawęglania prowadzono w proszkach w czasie 6h przy zastosowaniu różnych temperatur procesu. Badania zużycia prowadzono stosując metodę trzy wałeczki-stożek. Prędkość tarcia wynosiła 0,58 m/s, stosowano obciążenia 50 MPa i 400 MPa, drogę tarcia 3470 m. W trakcie badań dozowano olej SAE30 w ilości 30 kropli na minutę. Badania obejmowały również: budowę warstwy, jej grubość, rozkład mikrotwardości oraz skład fazowy.

EN

The paper presents results of wear tests of hot-work steels 4H5W2FS, AMS 6437E and cold- work steels ASTM A681, Ch 12FS, with surface hardened by Carbo carburizing process. The carburizing process was carried out in powder pack during for 6 h. Wear tests were made by the three cylinders-cone method. Wear velocity was 0.58 m/s, unit bad was 50 MPa and 400 MPa, wear path was 3470 m. SAE30 oil was applied at the rate of 30 drops per minute. Investigated factors were: morphology, depth and microhardness of obtained cases, their microstructure, as well as phase composition.