Surface Integrity in Machining

Davim, J. Paulo

doi:10.1007/978-1-84882-874-2

Cited by 232 publications

(35 citation statements)

References 2 publications

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“…The t W temperature occurring there is the combined effect of the heat generated due to the friction of the flank face of the tool against the machined surface, and the plastic strains preceding the shear of workpiece material and penetrating the surface layer of the workpiece. The adverse effect of temperature in the workpiece being machined may result in the occurrence and increase of adverse internal stresses in the surface layer, or changes in linear dimensions occurring during cooling down, and by this causing errors in the quality of final products [2] and [4]. It should be noted here that the maximum values of the t W-max temperature occurring in the workpiece being machined are normally much lower than those in chips and the tool [4].…”

Section: Introductionmentioning

confidence: 87%

Application of Thermographic Measurements for the Determination of the Impact of Selected Cutting Parameters on the Temperature in the Workpiece During Milling Process

Zgórniak

Stachurski

Ostrowski

2016

SV-JME

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In this paper, the impact of selected cutting parameters (both cutting and feed speed) on the temperature generated in the workpiece being machined during milling is assessed. The investigations were carried out by milling of 41Cr4 alloy steel using disc cutter mill with F40M sintered carbide inserts with the anti-wear coating. The investigations were conducted with the dry cutting manner. During the investigations three cutting speeds and three feed speeds were applied, with a constant depth of cut. In the course of the investigations, the temperature in the machining, the zone was recorded using the Flir SC6000HS infrared camera. As a result of the measurements, the mean temperature in the defined measurement zone was determined, and, based on that, a procedure for the determination of the t W-max maximum temperature in the workpiece being machined has been proposed. Finally, on the basis of the obtained results, it has been found that the increase in cutting speed leads to the increase in the t W-max maximum temperature, whereas the increase in feed speed leads to the reduction of that temperature in the workpiece being machined. Highlights• Application of thermography measurements for the determination of the temperature produced in the workpiece being machined. • Description of the methodology of the determination of the tW-max maximum temperature in the workpiece being machined. • Determination of the impact of both cutting and feed speeds on the tW-max maximum temperature, in the workpiece being machined.

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Section: Introductionmentioning

confidence: 87%

Application of Thermographic Measurements for the Determination of the Impact of Selected Cutting Parameters on the Temperature in the Workpiece During Milling Process

Zgórniak

Stachurski

Ostrowski

2016

SV-JME

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“…Thus, the assurance of surface and subsurface integrity plays an important role in grinding [6]. There are four groups of variables that can affect the surface integrity of ground parts as follows [7]:…”

Section: Introductionmentioning

confidence: 99%

“…Among the several types of defects associated with the heat generated during grinding that can be encountered on the surface and subsurface of a ground part, the most common ones are phase precipitation, softening, phase transformations leading to rehardening, cracking, residual stress, and chemical reactions (associated with burn marks) [7].…”

Section: Introductionmentioning

confidence: 99%

Surface integrity assessment of M3 HSS cutting taps after grinding at various machining conditions

Vendrame

Silva

Machado

et al. 2018

Int J Adv Manuf Technol

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Grinding is a machining process that provides a combination of good surface finishing and tight dimensional tolerances on a machined component. Owing to these characteristics, it is employed in the finishing process of hardened parts, such as highspeed steel (HSS) cutting tools (principally drills and taps). Despite the various benefits, the specific energy in grinding is very high, resulting in high heat generated in the wheel-workpiece interface that could lead to thermal damages. To avoid such problems, aiming to maximize productivity and preserve the integrity of the machined component, a cutting fluid and cutting parameters must be properly selected. However, since the process dynamics is particular for each grinding process, especially in complex geometries, specific studies in real manufacturing conditions are required to understand the phenomena and minimize surface damages. In this context, this work aims to evaluate the surface integrity of M3 HSS cutting taps after they have been ground at various cutting conditions. Machining tests were performed in situ under controlled and variable wheel speed, depth of cut, and workpiece speed conditions. Machined surface images and microhardness below the surface were the output variables investigated. Results showed that, on average, the thickness of the affected surface layer was about 70% lower after machining at the lowest workpiece speed used. The correlation between grinding removal rates and thermal damage was also discussed.

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“…Characteristics of all machine components depend on the final surface quality 1 and surface material layers, namely the residual-stress (RS) distribution and the roughness. These properties involve functionality and durability, especially fatigue life.…”

Section: Introductionmentioning

confidence: 99%

Using the Barkhausen-noise analysis and metal-magnetic-memory method for material characteristics under fatigue damage

Kolařík¹,

Simecek²,

Kříž³

et al. 2017

Mater. Tehnol.

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The article deals with process monitoring and the subsequent diagnosis of fatigue damage during material testing of steel S355. The study was performed by means of the metal-magnetic-memory method, Barkhausen-noise analysis and X-ray diffraction. This combination could significantly enhance the inspection quality of critical mechanical-unit parts during their lifespan. X-ray diffraction was applied for the description of the state of residual stresses, in combination with the Barkhausen-noise analysis, which allows us to immediately determine the changes in the surface layer resulting from the residual-stress redistribution, hardness and potential microcracks. Additionally, a new unconventional method for the determination of the stress-concentration-zone location and for the detection of material defects and imperfections, the so-called metal-magnetic-memory method, will be introduced. Keywords: Barkhausen noise, metal-magnetic-memory method, X-ray diffraction, fatigue damagê lanek obravnava proces kontrole, in iz tega naknadno diagnozo utrujenostne po{kodbe, med preizkusom materiala, jekla S355.[tudija je bila izvedena s pomo~jo metode magnetnega spomina kovine, z Barkhausnovo analizo hrupa in z rentgensko difrakcijo. Ta kombinacija lahko ob~utno izbolj{a kvaliteto kontrole kriti~nih mehanskih komponent med njihovo`ivljenjsko dobo. Rentgenska difrakcija je bila uporabljena za opis stanja zaostalih napetosti, v kombinaciji z analizo Barkhausnovega hrupa, kar omogo~a takoj{nje dolo~anje sprememb v povr{inski plasti, kar je posledica prerazporeditve zaostalih napetosti, trdote in potencialnih mikrorazpok. Dodatno bo predstavljena nova neobi~ajna metoda za dolo~anje podro~ij koncentriranja napetosti ter za odkrivanje napak in nepravilnosti, imenovana metoda magnetnega spomina kovine. Klju~ne besede: Barkhausnov hrup, metoda magnetnega spomina kovin, rentgenska difrakcija, utrujenostna po{kodba

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Surface Integrity in Machining

Cited by 232 publications

References 2 publications

Application of Thermographic Measurements for the Determination of the Impact of Selected Cutting Parameters on the Temperature in the Workpiece During Milling Process

Application of Thermographic Measurements for the Determination of the Impact of Selected Cutting Parameters on the Temperature in the Workpiece During Milling Process

Surface integrity assessment of M3 HSS cutting taps after grinding at various machining conditions

Using the Barkhausen-noise analysis and metal-magnetic-memory method for material characteristics under fatigue damage

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