Dry turning of sintered molybdenum

Sortino, Marco; Totis, Giovanni; Prosperi, F.

doi:10.1016/j.jmatprotec.2013.01.017

Cited by 11 publications

(5 citation statements)

References 13 publications

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“…The main influencing factors and their interactions are listed in Table 5, in decreasing order with respect to the impact caused by these factors. In the case of a turning operation, on a parallel turn, the shape of the machined surface depends on the geometrical features of the cutting edge of the tool and the feed rate for a constant pass [19,20,21]. As a result, aim to find out the influence factor of each of the cutting parameters on the machined surface quality using the experimental design method (DOE).…”

Section: Results Of the Parameters Impactmentioning

confidence: 99%

“…A couple of material, different shades (hard-tender) were chosen; The 42CrMo4 for the cylinder is a pre-processed steel used for loaded transmission parts: camshaft, cylinders, gears and crowns; the 20MnCr5 for the pin is a more or less hard and resistant processing steel, often used for: the rocker finger, the bushings, the chain sprockets and the pins [19,20,21]. For the purpose of profile study and for the determining of the real roughness value, we used a profilometer (Alti Serf 500) fit with 3D image processing software and a 2D roughness profile (Figure 1(e)), the implemented scanning is perpendicular to the generator striations [21]. Two arithmetic roughness measuring (Ra) have been implemented, the first is the outcome of the finishing straight turning operation of each track according to the different cutting parameters used (Figure1(e) and 2), and the second after tribological test (Figure 9 and 10).…”

Section: Machining and Measuringmentioning

confidence: 99%

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Tribological behavior of steel-steel pair: Influence of roughness and cutting parameters

Bouhabila

Bouchoucha²,

Merabet³

et al. 2022

JMES

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Roughness characterizes the quality of the machined surfaces, mainly determined by the geometric tolerances and induced by the different factors involved in the cutting process. The aim of this paper is to study the influence of cutting parameters (cutting speed (Vc), feed rate (f), tool nose radius (Rc) and cutting depth (ap)), on the cylinder surface roughness, in order to value the friction coefficient (μ) and the wear rate (W) of the contact surfaces of steel-steel pair: 42CrMo4-20MnCr5. Full factorial design (DOE) of 9 tests is used, to develop theoretical model of the roughness of machined metal parts on turning. Hence, the influence of the cylinder roughness on the friction and wear behavior of the steel-steel pair contact is studied, using a pin-cylinder tribometer. The results revealed that the friction coefficient and wear rate, increases progressively by varying the surface roughness (cutting parameters). The processing and observations of the results were recorded using a profilometer, an optical microscope, a scanning electron microscopy (SEM) followed by an analysis in energy dispersive spectroscopy (EDS). However, the surface of the pin is plowed, cracked and plastically deformed, thus inducing more loss of material by adhesion and oxidation of the formed particles on the cylinder, which bring about a material transfer and formation of a metal oxide layer.

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Section: Results Of the Parameters Impactmentioning

confidence: 99%

Section: Machining and Measuringmentioning

confidence: 99%

Tribological behavior of steel-steel pair: Influence of roughness and cutting parameters

Bouhabila

Bouchoucha²,

Merabet³

et al. 2022

JMES

View full text Add to dashboard Cite

show abstract

“…The decrease in surface roughness with increasing cutting speed can be explained by lower built-up edge formation tendency at higher cutting speed. Unless the cutting edge is subjected to serious wear due to the high cutting speed, surface roughness value decreases with increasing cutting speed [10,20].…”

Section: Analyses Of Surface Roughnessmentioning

confidence: 99%

“…Most of the carbide cutting tools of different geometries and different grades were also not also found to be suitable for turning of sintered molybdenum. Good surface quality and acceptable tool life were obtained when using ultra-fine grained carbide cutting tools with cobalt binder [10].…”

Section: Introductionmentioning

confidence: 99%

Cutting parameter optimization in shoulder milling of commercially pure molybdenum

Gökçe

Çiftçi

Demir

2018

J Braz. Soc. Mech. Sci. Eng.

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Due to its superior properties such as high melting point (2617°C), high thermal conductivity and low thermal expansion at higher temperatures, molybdenum is a refractory metal and is used for making critical parts in defense, space, electronics and nuclear industries. High cost of molybdenum makes the selection of suitable cutting conditions imperative in machining operations in order to obtain the required surface quality and dimensional accuracy. In this study, suitable cutting tools and cutting parameters were aimed to be determined in terms of cutting forces (F c) and average surface roughness (R a) when shoulder milling commercially pure molybdenum. The milling tests were carried out at 0.05, 0.1, 0.15, 0.2 mm/tooth feed rates and 75, 100, 125, 150 m/min cutting speeds using four different cutting tools. The Taguchi's experimental design (L16 orthogonal array) technique was implemented. Analysis of variance was used to determine the effects of cutting tools and cutting parameters on R a and F c. The results showed that the feed rate is the most influential parameter for F c while the cutting speed is for R a. Keywords Pure molybdenum Á ANOVA Á Surface roughness Á Cutting forces List of symbols a p Radial depth of cut (mm) a e Axial depth of cut (mm) A 0 Optimum S/N ratio for A (cutting tool) (dB) B 0 Optimum S/N ratio for B (feed rate) (dB) C 0 Optimum S/N ratio for C (cutting speed) (dB) CI Confidence interval f Feed rate (mm/tooth) F c Main cutting force (N) N Total number of tests g G S/N ratio calculated at optimum level (dB) g G S/N averages of control factors (dB) n eff Confirmatory test number R a Average surface roughness (lm) S/N Signal/noise ratio (dB) V c Cutting speed (m/min) V e Error variance

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“…The workability behaviour of ferrous powder metallurgy materials with different molybdenum content was investigated by [10,11]. They found that steel with 1,5 % molybdenum had better machinability properties compared to other steels and good surface quality and satisfactory tool life can be achieved in dry conditions at relatively high cutting speeds using commercial tools.…”

Section: Literature Reviewmentioning

confidence: 99%

Machinability improvement of powder metallurgy steels

2016

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Original scientific paper Powder metallurgy is one of the possible competitive options among those up-to-date replication technologies that are able to produce final shapes with no need for subsequent machining. However, there are some special geometries which require the subsequent machining of certain parts produced by powder metallurgy. These include grooves, threads and cross bores. The goal of the research discussed in this paper is to determine the effect of the material composition changes on the secondary machining properties of powder metallurgy steels (PMS). Varying the carbon and the copper content of the powder mix cutting force measurement was carried out during face grooving tests in turning. Using the ranking number of the measured characters, the machinability of samples was evaluated with each powder mixes. The optimal percentages of the copper and the carbon content were determined based on the results of the experimental measurements. Keywords: cutting force measurements; grooving test; machinability evaluation; material composition changes; metallic matrix composites; powder metallurgy Poboljšanje strojne obradivosti čelika metalurgije prahaIzvorni znanstveni članak Metalurgija praha je jedna od mogućih opcija među postojećim tehnologijama kojima se mogu proizvesti završni oblici bez dodatne obrade. Međutim, postoje neke posebne geometrije koje zahtijevaju dodatnu obradu nekih dijelova proizvedenih metalurgijom praha. To su žljebovi, navoji i poprečni provrti. Cilj je ovog istraživanja utvrditi učinak promjena sastava materijala na sekundarna svojstva obradbe čelika metalurgije praha -powder metallurgy steels (PMS). Variranjem sadržaja ugljika i bakra mješavine praha provedeno je mjerenje sile rezanja tijekom ispitivanja glodanja utora kod tokarenja. Primjenom rangirnog broja izmjerenih veličina, procjenjivana je obradivost uzoraka svake mješavine praha. Određeni su optimalni udjeli bakra i ugljika na temelju rezultata dobivenih eksperimentalnim mjerenjem.Ključne riječi: ispitivanje glodanja; kompoziti s metalnom matricom; metalurgija praha; mjerenje sile rezanja; procjena obradivosti; promjene sastava materijala

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Dry turning of sintered molybdenum

Cited by 11 publications

References 13 publications

Tribological behavior of steel-steel pair: Influence of roughness and cutting parameters

Tribological behavior of steel-steel pair: Influence of roughness and cutting parameters

Cutting parameter optimization in shoulder milling of commercially pure molybdenum

Machinability improvement of powder metallurgy steels

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