Development and research of thеrmоplаstiс methods for hardening details

Кальченко, В. В.; Yeroshenko, Andrii; Boyko, S.V.; Ignatenko, P.L.

doi:10.33271/nvngu/2020-2/053

Cited by 4 publications

(3 citation statements)

References 8 publications

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“…Various technological methods improve the quality of surface layers and increase the durability and reliability of machine parts in operation [3][4][5][6]. All these technological processes contribute to the formation of high-quality strengthened layers, which slow down the formation and propagation of fatigue cracks.…”

Section: Literature Reviewmentioning

confidence: 99%

Formation of Residual Stresses during Discontinuous Friction Treatment

Hurey

Gurey

Bartoszuk

et al. 2021

JES

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The tool with grooves on its working surface is used to improve the properties of the strengthened layer. This allows us to reduce the structure’s grain size and increase the thickness of the layer and its hardness. Mineral oil and mineral oil with active additives containing polymers are used as a technological medium during friction treatment. It is shown that the technological medium used during the friction treatment affects the nature of the residual stresses’ distribution. Thus, when using mineral oil with active additives containing polymers, residual compressive stresses are more significant in magnitude and depth than when treating mineral oil. The nature of the residual stresses diagram depends on the treated surface’ shape. After friction treatment of cylindrical surfaces, the highest compressive stresses near the treated surface decreases with depth. And after friction treatment of flat surfaces near the treated surface, the compressive stresses are small. They increase with depth, pass through the maximum, and then decrease to the original values. The technological medium used during friction treatment affects residual stresses in the grains and in the crystal lattice.

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Section: Literature Reviewmentioning

confidence: 99%

Formation of Residual Stresses during Discontinuous Friction Treatment

Hurey

Gurey

Bartoszuk

et al. 2021

JES

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“…The extensive utilization of thermoplastic materials is primarily attributed to their recyclability, cost-effectiveness, ease of machining with low cutting forces and temperatures, resilience to external factors, and numerous other desirable properties [ 5 , 6 ]. Operating within various temperature ranges specific to each thermoplastic ensures the prevention of excessive heating and the preservation of mechanical and other essential properties [ 1 , 7 , 8 , 9 , 10 , 11 ]. Ongoing advancements in thermoplastic materials, often termed engineering plastics, are directed towards enhancing mechanical characteristics, refining chemical compositions, and developing composites that better align with market demands.…”

Section: Introductionmentioning

confidence: 99%

Influence of Cutting Regime Parameters on Determining the Main Cutting Resistance during Polypropylene Machining

Prvulović,

Mošorinski,

Josimović

et al. 2024

Polymers

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This study examines the impact of cutting regimes on determining cutting resistance in the processing of polypropylene (PP) using the CNC lathe EMCO F5. The rationale for this research stems from polypropylene’s rarity among thermoplastics in possessing structural stability, allowing for its comparison to metals and practical application in products replacing metal parts. Leveraging its favorable mechanical properties, polypropylene finds utility in producing parts subject to dynamic loads, boasting high resistance to impact loads—particularly undesirable in machining. An advantageous characteristic of polypropylene is its affordability, rendering it an economical choice across numerous applications. Despite these merits, polypropylene’s exploration in cutting processing remains limited, underscoring the novelty of this research endeavor. The main method for determining cutting resistance involves measuring electric current strength during processing. This direct measurement, facilitated by input cutting regime parameters, is recorded by the PLC controller, with the current value extracted from the machine tool’s ammeter. The experimental approach entails varying cutting regime parameters—cutting speed (v), feed rate (s), and depth of cut (a)—across minimum and maximum values, recognized as pivotal factors influencing cutting force development and the attainment of the desired machined surface quality.

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“…The formation of reinforced surface layers on the working surfaces of machine parts and ensuring the appropriate accuracy and quality of machined surfaces are problematic tasks. For this purpose, various cutting methods are used, which provide high parameters of accuracy and quality of treated surfaces [13], the formation of a regular profile on the contacting surfaces [14], grinding with various types of abrasive wheels [15], surface plastic deformation [16], the application of various coatings [17][18][19], surfacing with alloy metal [20,21], electrophysical and electrochemical processing methods [22], etc. [23].…”

Section: Introductionmentioning

confidence: 99%

Resistance to Wear during Friction without Lubrication of Steel-Cast Iron Pairing with Nanocrystalline Structure-Reinforced Surface Layers

Hurey,

Maruschak,

Augousti

et al. 2023

Lubricants

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During the TDT of 41Cr4 steel specimens, a uniformly reinforced white layer with a nano-crystalline structure is formed in the surface layers. The wear resistance of sliding friction without the lubrication of a pair of steel 41Cr4—grey cast iron EN-GJL-200 (EN) under the face-to-face (“ring-ring”) scheme has been studied. It is revealed that when the sliding velocity changes from 0.25 m/s to 4 m/s and the unit load changes from 0.2 MPa to 1.0 MPa, a pair with a reinforced surface layer on 41Cr4 steel specimens and unreinforced specimens of EN-GJL-200 (EN) grey cast iron has a higher wear resistance than an unreinforced pair. The wear resistance increases for both reinforced and not reinforced specimens operating in a friction pair.

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Development and research of thеrmоplаstiс methods for hardening details

Cited by 4 publications

References 8 publications

Formation of Residual Stresses during Discontinuous Friction Treatment

Formation of Residual Stresses during Discontinuous Friction Treatment

Influence of Cutting Regime Parameters on Determining the Main Cutting Resistance during Polypropylene Machining

Resistance to Wear during Friction without Lubrication of Steel-Cast Iron Pairing with Nanocrystalline Structure-Reinforced Surface Layers

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