Hydraulic Press Open Die Forging of 21CrMoV5-7 Steel CCM Roller with Flat Upper and Concave Semi-round Lower Cogging Dies

Kukhar, Volodymyr; Vasylevskyi, Oleg; Khliestova, O. A.; Berestovoi, Ivan; Balalayeva, Elena

doi:10.1007/978-3-030-91327-4_48

Cited by 2 publications

(2 citation statements)

References 24 publications

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“…The forging temperature range was chosen as 1140-850 °C, which corresponds to the recommendations for high-chromium steels [30][31][32]. The upper-temperature limit is associated with the tendency of these steels to overheat and overburn.…”

Section: Methodsmentioning

confidence: 99%

Development of Manufacturing Process for High-Chromium Steel Large Welding Roll

Kukhar,

Vasylevskyi,

Malii

et al. 2024

DDF

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Due to the operating conditions of weld and calibrating rolls used in the production processes of large electric-welded pipes, their material is subject to stringent wear and abrasion resistance requirements at high temperatures. The limited capabilities of conventional Cr-Mn-Ni tool steels and open die forging technologies with heat treatment processes do not provide the required performance properties for large welded rolls. Therefore, the material of the product was replaced with Cr12MoV high-chromium steel. This required identifying the formation patterns of the fine grain structure of high-chromium steel in order to adjust the production technology with adaptation to the unique conditions and equipment (12.5 MN hydraulic forging press, heating and thermal furnaces) of the forging shop. The technology was offered, which included the development of modes from heating to heat treatment with intermediate two-stage forging from Cr12MoV steel ingots in two sets of combined dies. At the first stage, deformation with a low reduction ratio ε = 5% and a relative feed rate of 0.4 per pass was provided to break and refine the carbide mesh, and at the second stage, intense deformation with a reduction ratio ε = 15% was performed. Further practical application has shown that the durability of weld rolls made from the new material increases by 20–30%.

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Section: Methodsmentioning

confidence: 99%

Development of Manufacturing Process for High-Chromium Steel Large Welding Roll

Kukhar,

Vasylevskyi,

Malii

et al. 2024

DDF

Self Cite

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“…The studies in [15][16][17][18][19][20] explore the dynamics of a ship's propeller when the water surface is agitated using a model that includes an increase in the rotational inertia of the propeller due to the simple addition of the water mass. The difficulty of this approach means that such studies are limited.…”

Section: Introductionmentioning

confidence: 99%

Transfer Function for a Controllable Pitch Propeller with Added Water Mass

Leshchev,

Maslov,

Palagin

et al. 2023

Polish Maritime Research

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The relevance of this study lies in the fact that it presents a mathematical model of the dynamics of the propulsion system of a ship that takes into consideration the mass of water added to it. The influence of this phenomenon on the resonant frequencies of the propeller shaft is examined, and a transfer function for a controllable-pitch propeller is obtained for various operating modes. The purpose of the study is to improve the calculation of the dynamic operating modes of a controllable-pitch propeller by examining the features of a visual models. The VisSim software package is used in the study. A visual model is developed that considers the influence of the rotational speed on the value of the rotational inertia attached to the variable-pitch screw of the mass of water, and a special transfer function is proposed. The study shows that a transfer function of this type has a loop enabling negative feedback. An analysis of the operation of the propeller shaft at its resonant frequency is conducted based on the application of frequency characteristics using the transfer functions obtained. We show that in the low-frequency region, a consideration of the added rotational inertia using the proposed transfer function leads to a significant difference compared to the result obtained with the existing calculation method.

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Hydraulic Press Open Die Forging of 21CrMoV5-7 Steel CCM Roller with Flat Upper and Concave Semi-round Lower Cogging Dies

Cited by 2 publications

References 24 publications

Development of Manufacturing Process for High-Chromium Steel Large Welding Roll

Development of Manufacturing Process for High-Chromium Steel Large Welding Roll

Transfer Function for a Controllable Pitch Propeller with Added Water Mass

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