Machinability evaluation and screening of leaded and lead-free brasses using a non-linear robust multifactorial profiler

Toulfatzis, Anagnostis; Pantazopoulos, G.; Besseris, George J.; Paipetis, Alkiviadis S.

doi:10.1007/s00170-016-8435-5

Cited by 16 publications

(18 citation statements)

References 19 publications

(40 reference statements)

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“…The highest hardness obtained for CW510L after heat treatment (Table 4) is directly related to a lower percent difference in hardness between the produced chip and the base metal, due to the lower strain hardening rate. This is also related to the lower extent of plastic deformation and hence the ease in chip fracturing and segmentation for the applied machining conditions [13]. Moreover, this argument is also in agreement with the lowest chip morphology obtained in the case of CW510L (Class.…”

Section: Chip Morphologysupporting

confidence: 83%

“…This could be attributed to the fact that the most influential parameter (depth of cut) did not change significantly, especially between the two first classes of brass alloys, i.e., CW510L and CW511L. The hierarchy of cutting process parameters of the three brass alloys (CW510L, CW511L, and C27450), using the Taguchi-DOE technique, was studied and reported in a previous research paper [13]. Chip morphologies after heat treatment compared with the as received conditions were studied by optical microscopy for the three lead-free brass alloys ( Figure 5).…”

Section: Power Consumptionmentioning

confidence: 99%

“…In previous research works, machinability tests were performed in turning operation in order to evaluate the chip morphology, the power consumption, the cutting force, and the surface roughness (Ra) of CW510L, CW511L, and C27450 lead-free brass alloys, in as-received condition [13,18]. Table 2 shows the combinations of cutting parameters which resulted in the worst result for each specific quality characteristic (chip morphology, power consumption, cutting force, and surface roughness) of the studied lead-free brass alloys, in the "as received" condition.…”

Section: Machinability Testingmentioning

confidence: 99%

“…Table 2. The "worst" combinations of cutting parameters for the quality characteristics (chip morphology, power consumption, cutting force, surface roughness-Ra) of studied lead-free brass alloys in "as received" condition [13,18]. …”

Section: Microstructure and Mechanical Propertiesmentioning

confidence: 99%

“…In previous works, machinability testing was performed in order to evaluate the chip morphology and power consumption, as well as the cutting force and the surface roughness [13,18]. In the previously mentioned studies, machining was conducted in lead-free brass alloys in the "as received" conditions and the optimum cutting parameters were defined by using Design of Experiments (DOE) statistical techniques.…”

Section: Machinability Evaluationmentioning

confidence: 99%

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Final Heat Treatment as a Possible Solution for the Improvement of Machinability of Pb-Free Brass Alloys

Toulfatzis

Pantazopoulos²,

David

et al. 2018

Metals

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Abstract:Heat treatment was performed in order to improve the machinability of three lead-free extruded and drawn brasses, namely CuZn42 (CW510L), CuZn38As (CW511L), and CuZn36 (C27450), based on the concept of microstructural modification. The examined machinability criteria were the following: chip morphology, power consumption, cutting force, and surface roughness. All the above quality characteristics were studied in turning mode in "as received" and "heat treated" conditions for comparison purposes. The selected heat treatment conditions were set for CW510L (775 • C for 60 min), CW511L (850 • C for 120 min), and C27450 (850 • C for 120 min) lead-free brass alloys, according to standard specification and customer requirement criteria. The results are very promising concerning the chip breaking performance, since the heat treatment contributed to the drastic improvement of chip morphology for every studied lead-free brass. Regarding power consumption, heat treatment seems beneficial only for the CW511L brass, where a reduction by 180 W (from 1600 to 1420 W), in relation to the as-received condition, was achieved. Furthermore, heat treatment resulted in a marginal reduction by 10 N and 15 N in cutting forces for CW510L (from 540 to 530 N) and CW511L (from 446 to 431 N), respectively. Finally, surface roughness, expressed in terms of the average roughness value (Ra), seems that it is not affected by heat treatment, as it remains almost at the same order of magnitude. On the contrary, there is a significant improvement of maximum height (Rt) value of CW511L brass by 14.1 µm (from 40.1 to 26.0 µm), after heat treatment process performed at 850 • C for 120 min.

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Section: Chip Morphologysupporting

confidence: 83%

Section: Power Consumptionmentioning

confidence: 99%

Section: Machinability Testingmentioning

confidence: 99%

Section: Microstructure and Mechanical Propertiesmentioning

confidence: 99%

Section: Machinability Evaluationmentioning

confidence: 99%

See 3 more Smart Citations

Final Heat Treatment as a Possible Solution for the Improvement of Machinability of Pb-Free Brass Alloys

Toulfatzis

Pantazopoulos²,

David

et al. 2018

Metals

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The effect of high-pressure cutting fluid supply on the chip breakability of lead-free brass alloys

Müller,

Brans,

Meurer

et al. 2023

Int J Adv Manuf Technol

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To improve machinability and in particular chip breakability, brass alloys are usually alloyed with small quantities of lead. Due to environmental and health concerns, the use of lead has been restricted in the last years. As lead-free brass alloys are progressively implemented in the industry, challenges arise due to their differing properties from traditional leaded brass alloys. One of the main challenges in automated continuous cutting processes is the worse chip breakability of lead-free brass alloys leading to longer and tangled chips. Hence, the impact of a high-pressure cutting fluid supply, as well as the impact of a chip-breaking geometry and the combined effect of both, has been investigated at different feeds. The three brass alloys CuZn37 (CW508L), CuZn38As (CW511L), and CuZn42 (CW510L) were studied at varying cutting fluid supply pressure levels and feed rates in a radial cutting operation. Cutting forces were measured, and chips were analyzed. No overall systematic impact of the cutting fluid supply pressure on the cutting forces was observed. In conclusion, increased pressure levels, a chip-breaking geometry, and an increased feed rate enhance the chip breakability of the investigated alloys.

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Synchronous screening-and-optimization of nano-engineered blood pressure-drop using rapid robust non-linear Taguchi profiling

Besseris

2019

Chemical Engineering Science

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Atherosclerosis induces abnormal blood-flow patterns in coronary arteries mainly because of the irregular accumulation of fibrofatty plaque on the artery walls. Morphological alterations of the wall-surface attributes downgrade vascular elasticity, which compromises the normal blood-pressure gradient behavior by sporadically interfering with the effective-flow crosssection adjustment. An iron-oxide booster has been recently studied as a potential nanoparticle treatment to regulate an elevated blood-pressure condition. Taguchi-type multifactorial experimentation rapidly generates small and dense datasets in order to expedite arterial flow screening/optimization predictions. The optimal blood pressure-drop performance is investigated against four vital controlling factors. We show that tracking down inherently complex blood-flow phenomena often entails the elucidation of non-linear and messy data structures. Translating such data demands robust and agile techniques to decipher governing relationships while guarding against spurious effects from uncertainty asymmetry. We also show that by using distribution-free profiling, we may synchronously accomplish the screening and optimization tasks more accurately in comparison to other competing techniques. Illustrating our technique on a chemical engineering paradigm, we found that out of the four investigated factors only the blood behavior index to be strongly influential. A blood behavior index setting of 0.5, which is below the normal physiological limit, minimizes the blood pressure drop at an optimal value of 385 Pa/m. The proposed methodology demonstrates how the required sampling size may be further reduced, thus making the study even more economically 3 and practically efficient. This was shown to be achieved without relinquishing important information about the dominant phenomena, hence rendering our solution to be also lean and agile.

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Machinability evaluation and screening of leaded and lead-free brasses using a non-linear robust multifactorial profiler

Cited by 16 publications

References 19 publications

Final Heat Treatment as a Possible Solution for the Improvement of Machinability of Pb-Free Brass Alloys

Final Heat Treatment as a Possible Solution for the Improvement of Machinability of Pb-Free Brass Alloys

The effect of high-pressure cutting fluid supply on the chip breakability of lead-free brass alloys

Synchronous screening-and-optimization of nano-engineered blood pressure-drop using rapid robust non-linear Taguchi profiling

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