Study of High Speed Machining by Using Split Hopkinson Pressure Bar

Larbi, S.; Djebali, S.; Bilek, Ali

doi:10.1016/j.proeng.2015.08.074

Cited by 5 publications

(3 citation statements)

References 4 publications

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“…First, cutting specimens-see Figure 3a-and compression specimens-see Figure 3b-were tested using the SHPB; see the experimental set-up in Figure 1. The cutting specimens were adapted to the experimental setup to simulate a turning process, similar to earlier studies [21,22]. The clamping consisted of a cutting holder attached to the transmission bar.…”

Section: Methodsmentioning

confidence: 99%

High Strain Rate and Stress-State-Dependent Martensite Transformation in AISI 304 at Low Temperatures

Fricke

Gerstein

Kotzbauer

et al. 2022

Metals

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Deformation-induced martensitic transformation as the basis of a hardening process is dependent, among others, on the stress state. In applications such as cryogenic cutting, where a hardened martensitic subsurface can be produced in metastable austenitic steels, different stress states exist. Furthermore, cutting typically occurs at high strain rates greater than 103s−1. In order to gain a deeper insight into the behavior of a metastable austenitic steel (AISI 304) upon cryogenic cutting, the influence of high strain rates under different loading conditions was analyzed. It was observed that higher strain rates lead to a decrease in the α′-martensite content if exposed to tensile loads due to generated adiabatic heat. Furthermore, a lath-like α′-martensite was induced. Under shear stress, no suppression of α′-martensite formation by higher strain rates was found. A lath α′-martensite was formed, too. In the specimens that were subjected exclusively to compressive loading, almost no α′-martensite was present. The martensitic surface generated by cutting experiments showed deformation lines in which α′-martensite was formed in a wave-like shape. As for the shear specimens, more α′-martensite was formed with increasing strain rate, i.e., force. Additionally, magnetic etching proved to be an effective method to verify the transformation of ferromagnetic α′-martensite.

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Section: Methodsmentioning

confidence: 99%

High Strain Rate and Stress-State-Dependent Martensite Transformation in AISI 304 at Low Temperatures

Fricke

Gerstein

Kotzbauer

et al. 2022

Metals

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“…The stress at the secondary shear plane are usually 30% less than those of the primary shear [30] [31]. Overall increase in the cutting speed will reduce cutting forces but in some cases high speed cutting causes excessive increase in the deformation rates that may result in increased machining forces [32] [33]. High speed machining of alloys containing hard particles will result in elevated cutting forces due to excessive flank wear occurring to the cutting tool [34].…”

Section: Cutting Forces Generated and Factors Affecting Themmentioning

confidence: 99%

Milling parameters of Al-Cu and Al-Si cast alloys

Mofidi

Zedan

Samuel

et al. 2019

Int J Adv Manuf Technol

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The present study was carried out to study the machinability i.e. milling characteristics of an Al-6%Cu-0.7%Si alloy (in the as-cast, T5 and T7 aging conditions) and compare these characteristics to those of well-defined B319.0 (as-cast, T7-treated) and A356.0 (as-cast, T6-treated) alloys. Wet milling was carried out on 15 blocks prepared from each alloy using new carbide inserts for about 120m machining distance. Thirty-five blocks (12 in x 7 in x 1.5 in) were employed. The milling was carried out using a CNC Huron KX Five 5axis high speed machine. The experiment comprised the CNC machine, the blocks to be machined, a table dynamometer with piezoelectric sensors that are responsible for detecting and measuring the cutting forces, a signal amplifier and an A/D converting unit. New and dull cutting inserts were used for each alloy group. Thirteen layers of material were removed from each block, where each layer consisted of 10 paths, and the depth of cut was 1.35 mm. The results employing new inserts showed that the cutting forces for Al-Cu based alloys were not affected by the applied heat treatment. The presence of Cu in the B319.0 alloy neutralized to some extent the harmful effect of the hard Si particles. Maximum cutting forces were obtained from machining the T6-treated A356.0 alloy, due to the presence of a high density of hard eutectic silicon particles (approximately 41495 particles∕mm 2) in addition to a dense precipitation of ultra-fine Mg 2 Si particles. Thus, the 6% Cu in the Al-Cu based alloy may be considered to act as a self-lubricant, leading to much smoother finishing surfaces compared to those exhibited by B319.0 and A356.0 alloys. Similar observations were reported on the wearing of the drilling tools. In addition, after covering 120m machining distance, tiny burrs were found adhered to the outer edges of the block workpiece, whereas the burr in the case of A356.0 alloy was separated from the block.

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“…The results show that the saw-tooth chip produced in HSC is due to periodic thermoplastic shear-banding. Lardi et al 8 compared the chip formation process of HSC of 6060 aluminum alloy, 2024 aluminum alloy and 35 NCD16 steel, and found that the chip of 2024 aluminum alloy and 35 NCD16 steel turns from continuous ribbon to serrated segments. In short, there are many experiments conducted using the cutting device based on an improved SHPB system, but their research focus is limited to cutting force, cutting temperature and chip morphology.…”

Section: Introductionmentioning

confidence: 99%

Investigation on surface quality of high-speed cutting titanium alloy Ti6Al4V based on Split-Hopkinson pressure bar

Zhang

Wang

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part B:

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High-speed cutting technology has the characteristics of high material removal rate and excellent processing quality. To investigate the surface quality of high-speed cutting Ti6Al4V alloy, the orthogonal cutting experiment is the cutting device based on improved Split-Hopkinson pressure bar carried out with a cutting speed of about 7–16 m/s. Surface roughness, residual stress and three-dimensional surface topography are examined to characterize the surface quality. And the chip geometry parameters are measured to analyze the formation mechanism of surface topography. The result shows that cutting force and surface roughness increase rapidly with the increase in depth of cut. In the meantime, the periodic microwaves appeared on the machined surface, and their amplitudes increase with the increase in depth of cut. However, surface roughness, residual stress and microwave amplitude all decrease with the increase in cutting speed. Moreover, it is found that the evolution trend of chip thickness and surface roughness with cutting parameters is very similar. Therefore, it can be inferred that there is a strong relationship between surface topography and chip morphology.

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Study of High Speed Machining by Using Split Hopkinson Pressure Bar

Cited by 5 publications

References 4 publications

High Strain Rate and Stress-State-Dependent Martensite Transformation in AISI 304 at Low Temperatures

High Strain Rate and Stress-State-Dependent Martensite Transformation in AISI 304 at Low Temperatures

Milling parameters of Al-Cu and Al-Si cast alloys

Investigation on surface quality of high-speed cutting titanium alloy Ti6Al4V based on Split-Hopkinson pressure bar

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