Wyniki wyszukiwania - BazTech

1

Multi-objective optimization of the rotary turning of hardened mold steel for energy saving and surface roughness improvements

Doan Tat Khoa, Nguyen Trung Thanh, Van An-Le

Journal of Machine Engineering

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2023

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Vol. 23, No. 4

101--121

EN

In this investigation, the specific cutting energy (SCE) and average surface roughness (Ra) were decreased using the hard-rotary turning (HRT) factors, including the inclined angle (I), depth of cut (D), feed rate (f), and spindle speed (S). The Bayesian regularized feed-forward neural network was applied to develop the SCE and Ra models. The entropy method and vibration and communication particle swarm optimization (VCPSO) algorithm were employed to compute the weights and determine optimal factors. The optimizing outcomes presented that the optimal I, D, f, and S were 35 deg., 0.45 mm, 0.50 mm/rev., and 1200 rpm, respectively, while the SCE and Ra were decreased by 37.4% and 6.6%, respectively. The total turning cost was saved by 7.5% at the selected solution. The valuable outcomes could be applied to the practical HRT process to decrease performance measures, while the developed HRT operation could be utilized for machining difficult-to-cut materials.

2

Sustainable manufacturing: re-contouring of laser cladding restored parts by machining method with cutting energy management

Zhang Peirong, Du Jin, Zhou Tingting, Su Guosheng, Huang Weimin, Liu Zhanqiang

Archives of Civil and Mechanical Engineering

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2020

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Vol. 20, no. 2

167--176

EN

Laser cladding has been commonly utilized for restoring high value-added parts. However, the poor surface quality becomes key technological barrier which restricts its widespread applications. In the paper, re-contouring strategies by machining method are explored for minimal energy consumption as well as required surface roughness. Firstly, the effect of structural characteristics of the laser-cladded workpiece on specific cutting energy was explored by means of layer-by-layer turning and orthogonal cutting. Results indicated that the specific cutting energy increased, and the machining chatter/vibration exacerbated with decreasing coating thickness under fixed cutting parameters. The reason can be summarized as a result of the effect of elastoplastic deformation behavior across the interface. Then, the influences of depth of cut and feed on specific cutting energy in finish turning were addressed. Results indicated that the specific cutting energy reduced with increasing depth of cut and feed in the form of power functions. In addition, energy efficiency decreased with an increase in uncut chip thickness and cutting speed. On basis of this work, large feed and low cutting speed with the adoption of wiper inserts were recommended for minimizing energy consumption within surface roughness requirement.

3

A new aspects of hard machining using CBN tools with variable tool corner radius and tool wear effect

Grzesik W., Żak K.

Advances in Manufacturing Science and Technology

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2017

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Vol. 41, nr 1

5--20

EN

In this paper some important mechanical cutting characteristics such as cutting forces, specific cutting energy and cutting power were determined when finish turning of hardened 41Cr4 alloy steel and AISI 52100 and JIS-SUJ2 bearing steels using CBN tools with variable tool corner radius based on the experimental study and literature data. The tool corner radius was varied from 400 to 2400 µm and, in addition, flank wear effect was taken into account. Moreover, surface roughness produced by CBN tools with different tool corner radius was compared and surface finish obtained was characterized in terms of potential functional performance. As a result, the changes of Ra and Rz roughness parameters and relevant material distribution curves and bearing parameters in the form of Symmetrical Curve of Geometrical Contact (SCGC) are presented.

PL

W pracy określono niektóre charakterystyki procesu skrawania m.in. składowe siły, energię właściwą i moc skrawania w wykańczającym toczeniu utwardzonej stali stopowej 41Cr4 oraz stali łożyskowej AISI 52100 i JIS-SUJ2 narzędziami z CBN o zmiennym promieniu naroża. W analizie wyników uwzględniono dane doświadczalne i literaturowe. Stosowano promień naroża w zakresie od 400 do 2400 µm. Ustalono również wpływ zużycia ostrza na powierzchni przyłożenia. Dodatkowo, porównano chropowatość powierzchni generowaną ostrzami z CBN o zmiennym promieniu naroża oraz potencjalne właściwości eksploatacyjne powierzchni. Uzyskano zmianę zależności parametrów chropowatości powierzchni Ra i Rz oraz parametrów udziału materiałowego w postaci symetrycznych krzywych kontaktu geometrycznego (SCGC) powierzchni – krzywych Kaczmarka.

4

Przykłady zastosowań systemu do pomiaru mocy zainstalowanego na tokarce CNC

Chudy R., Grzesik W.

Mechanik

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2016

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R. 89, nr 12

1866--1867

PL

W artykule zaprezentowano system do pomiaru mocy zainstalowany na tokarce CNC. Przedstawiono przykłady aplikacji systemu oraz praktyczne wykorzystanie pozyskanych danych.

EN

This paper presents a power measurement system which allows recording the power consumption profile The system is based on computer processing of signals generated by current and voltage sensors connected to spindle and axis driving electric motors By using LabVIEW data acquisition system, it is possible to record total power consumption and its components during a typical machining operation.

5

Impact of the wedge angle on the specific cutting energy of black radish during the exploitation of guillotine knife

Starek A., Kusińska E.

ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes

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2016

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Vol. 5, No 3

111-122

EN

The paper presents the influence of cutting conditions of black radish guillotine knife on specific cutting energy value. The tests were carried out using the texture meter: Texture Analyser TA.XTplus Stable Micro Systems. The structure of the black radish is heterogeneous and, therefore, in order to study the specific cutting energy of black radish its parenchyma was taken from a few specific places. The samples were cut with a longitudinal and transverse orientation of the fibers relative to movement of the working tool. The cutting process was carried at the knives wedge angles: 2.5°; 5°; 7.5°; 10°; 12.5°; 15°, the knives moved at the speed of 0.83 mm·s-1. The results were statistically analyzed using the program Statistica 8.0. The statistical analysis showed the impact of the place of sampling, direction of fibers in the black radish parenchyma samples and knife wedge angle on the specific cutting energy. The black radish parenchyma samples obtained from the core of the top layer showed the highest specific energy of cutting. Furthermore, the specific cutting energy showed higher value when the orientation of fibers was in the transverse direction rather than longitudinal. The highest value of the specific cutting energy was obtained for the cutting knife wedge angle of 15°, and the lowest for the knife with β = 2.5° wedge angle.