Analysis of Damaged Delimber Knives and the Possibility of Increasing their Service Life

Ťavodová, Miroslava; Vargová, Monika; Krilek, Jozef; Stančeková, Dana

doi:10.21062/mft.2022.011

Cited by 4 publications

(1 citation statement)

References 12 publications

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“…Among them, the most thoroughly analyzed is the wear mechanism, which occurs mostly in cold forging processes [ 15 , 16 ], but also in hot forging processes; although, despite common opinion, it is not a dominating destructive mechanism [ 17 ]. The literature provides many studies referring to a complex analysis of the main tool destruction mechanisms in hot die-forging processes [ 18 , 19 , 20 ]. The listed forging tool destruction mechanisms mainly refer to the tools’ surface layer.…”

Section: Introductionmentioning

confidence: 99%

Increasing the Working Time of Forging Tools Used in the Industrial Process of Producing a Disk-Type Forging Assigned for a Gearbox through the Application of Hybrid Layers

Hawryluk,

Dudkiewicz,

Borowski

et al. 2024

Materials

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The article discusses the phenomena and destructive mechanisms occurring on the surface of 1.2344 steel dies used during the hot forging of disc-type forgings. Preliminary research has shown that gas nitriding alone, used so far, is insufficient due to the occurrence of destructive mechanisms other than abrasive wear, such as thermal and thermomechanical fatigue, which cause the average durability of such tools to be approximately 5000 forgings. Analyses were also carried out to assess the load on forging tools using numerical modeling (Forge 3.0NxT), which confirmed the occurrence of large and cyclically changing thermal and mechanical loads during the forging process. Therefore, in order to increase operational durability, it was decided to use two types of hybrid layers, differing in the PVD coating used: TiCrAlN and CrN, and then subjected to gas nitriding (GN). The obtained results showed that, depending on the area of the tool and the current working conditions, the applied PVD coatings protect the surface layer of the tool against the dominant destructive mechanisms. In both cases, the strength increased to the level of 7000 forgings, the tools could continue to work, and globally, slightly better results were obtained for the GN+TiCrAlN layer. The CrN-type layer protects the tool more against thermal fatigue, while the TiCrAlN layer is more resistant to abrasive wear. In areas where the hybrid layer was worn, a decrease in hardness was observed from 1300 HV to 600–700 HV, and in places of intense material flow (front—point 2 and tool bridge—point 9) the hardness dropped to below 400 HV, which may indicate local tempering of the material. Moreover, the research has shown that each process and tool should be analyzed individually, and the areas in the tool where particular destructive mechanisms dominate should be identified, so as to further protect the forging tool by using appropriate protective coatings in these areas.

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Section: Introductionmentioning

confidence: 99%

Increasing the Working Time of Forging Tools Used in the Industrial Process of Producing a Disk-Type Forging Assigned for a Gearbox through the Application of Hybrid Layers

Hawryluk,

Dudkiewicz,

Borowski

et al. 2024

Materials

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Assessment of the chipping process of beech ( Fagus sylvatica L.) wood: knives wear, chemical and microscopic analysis of wood

Krilek,

Čabalová,

Výbohová

et al. 2023

Wood Material Science & Engineering

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The Effect of Mixing the Additive Material with the Substrate During the Renovation of the Foundry Mold by TIG Welding Hardfacing

Šutka¹,

Konar²

2023

Manufacturing Technology

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The article is focused on the effect of mixing the additional material with the substrate (base material) on the properties of the weld metal during arc welding with TIG technology. The research is aimed at the use of arc welding with TIG technology in the repair of foundry molds. These are repairs of permanent steel foundry molds. The parts of the mold in contact with the liquid metal are subjected to heatchemical-mechanical stress. This load causes mold wear, which causes a decrease in surface quality and a change in the dimensional accuracy of the casting. The main cause of wear on the functional surfaces of the mold cavity is tribological processes. From the study of professional works dealing with mold wear [5,11,22], it is clear that one of the main parameters for determining the intensity of wear is surface hardness. The theoretical part deals with wear and the factors that affect wear. The experimental part compares the properties of one, two, and three-layer TIG welds, specifically the chemical composition, hardness, and coefficient of friction determined by the "ball-on-flat" method.

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Analysis of Damaged Delimber Knives and the Possibility of Increasing their Service Life

Abstract: Analysis of damaged delimber knives and the possibility of increasing their service lifeMiroslava Ťavodová (0000-0002-7376-4189) 1 , Monika Vargová (0000-0003-0473-9032) 1 , Jozef Krilek (0000-0002-8349-5269) 1 , Dana Stančeková (0000-0003-0713-8750) 2

Cited by 4 publications

References 12 publications

Increasing the Working Time of Forging Tools Used in the Industrial Process of Producing a Disk-Type Forging Assigned for a Gearbox through the Application of Hybrid Layers

Increasing the Working Time of Forging Tools Used in the Industrial Process of Producing a Disk-Type Forging Assigned for a Gearbox through the Application of Hybrid Layers

Assessment of the chipping process of beech ( Fagus sylvatica L.) wood: knives wear, chemical and microscopic analysis of wood

The Effect of Mixing the Additive Material with the Substrate During the Renovation of the Foundry Mold by TIG Welding Hardfacing

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