Cryogenic machining of porous tungsten for enhanced surface integrity

Schoop, Julius; Ambrosy, Florian; Zanger, Frederik; Schulze, Volker; Balk, T. J.; Jawahir, I.S.

doi:10.1016/j.jmatprotec.2015.10.002

Cited by 32 publications

(10 citation statements)

References 14 publications

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“…Furthermore, cryogenic cooling led to a significant increase in the microhardness of machined surface, but a decrease in the depth of hardened layer. Schoop et al [12] explored the influence of rake angle, cutting speed and pre-cooling temperature on surface roughness and tool wear in cryogenic machining of porous tungsten using a polycrystalline diamond tool. It was noticed that the surface roughness increased with the decrease of rake angle.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on chip deformation of Ti-6Al-4V titanium alloy in cryogenic cutting

Zhao

Gong

Ren

et al. 2018

Int J Adv Manuf Technol

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This paper first develops a cryogenic cutting system with adjustable jet temperature (− 196~20°C), and then carries out a series of dry cutting and cryogenic turning experiments for titanium alloy. Metallographic microscope is used to observe the chip morphology of titanium alloy and the geometric characteristic parameters of the chip are measured using a Digimizer image measurement software. The influence of cutting speed and cooling conditions on the chip morphology, chip height ratio, and serrated pitch has been analyzed. The experimental results reveal that the cutting speed and cooling conditions play significant roles on the chip morphology and serrated characteristics of titanium alloy. During the cryogenic cutting process, with the increase of cutting speed, the chip height ratio and serrated pitch of titanium alloy chip increase. It has been found that under the condition of cryogenic cutting, the lower jet temperature, the more obvious serrated characteristic of titanium alloy chip. It is also found that the fibrous adiabatic shear band exists in the shear zone; the chip height ratio and serrated pitch remarkably increase.

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Section: Introductionmentioning

confidence: 99%

Experimental study on chip deformation of Ti-6Al-4V titanium alloy in cryogenic cutting

Zhao

Gong

Ren

et al. 2018

Int J Adv Manuf Technol

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“…An in-depth study into cryogenic turning of porous tungsten was also performed by Schoop et al [128] using PCD cutting tools. Here, the influence of various cutting param- Pusavec [124] used a genetic algorithm to optimize the cutting parameters and tool grade for a specified surface quality.…”

Section: Conventional Machining Of Tungstenmentioning

confidence: 99%

Advanced Processing and Machining of Tungsten and Its Alloys

Omole

Lunt

Kirk

et al. 2022

JMMP

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Tungsten is a refractory metal with the highest melting temperature and density of all metals in this group. These properties, together with the high thermal conductivity and strength, make tungsten the ideal material for high-temperature structural use in fusion energy and other applications. It is widely agreed that the manufacture of components with complex geometries is crucial for scaling and optimizing power plant designs. However, there are challenges associated with the large-scale processing and manufacturing of parts made from tungsten and its alloys which limit the production of these complex geometries. These challenges stem from the high ductile-to-brittle transition temperature (DBTT), as well as the strength and hardness of these parts. Processing methods, such as powder metallurgy and additive manufacturing, can generate near-net-shaped components. However, subtractive post-processing techniques are required to complement these methods. This paper provides an in-depth exploration and discussion of different processing and manufacturing methods for tungsten and identifies the challenges and gaps associated with each approach. It includes conventional and unconventional machining processes, as well as research on improving the ductility of tungsten using various methods, such as alloying, thermomechanical treatment, and grain structure refinement.

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“…The common observation of an increase in specific cutting energy when decreasing uncut chip thickness is a microgeometry effect and a subgroup of the microstructure category. For example, in the machining of powdered metal, Schoop et al [34] found a significant impact of the cooling/lubricating strategy, specifically cryogenic cooling, on product quality and sustainability, through the elimination of a previously required post-processing step.…”

Section: Size Effects In Machiningmentioning

confidence: 99%

Characterization and Modeling of Surface Roughness and Burr Formation in Slot Milling of Polycarbonate

Adeniji

Schoop

Gunawardena

et al. 2020

JMMP

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Thermoplastic materials hold great promise for next-generation engineered and sustainable plastics and composites. However, due to their thermoplastic nature and viscoplastic material response, it is difficult to predict the properties of surfaces generated by machining. This is especially problematic in micro-channel machining, where burr formation and excessive surface roughness lead to poor component-surface integrity. This study attempts to model the influence of size effects, which occur due to the finite sharpness of any cutting tool, on surface finish and burr formation during micro-milling of an important thermoplastic material, polycarbonate. Experimental results show that the depth of cut does not affect either surface finish or burr formation. A proposed new sideflow model shows the dominant effect of cutting-edge radius and feed rate on surface finish, while tool edge roughness, coating and feed rate have the most pronounced influence on burr formation. Overall, a good agreement between the experimental data and the proposed size effect model for the machining of thermoplastic material was found. Based on these results, tool geometry and process parameters may be optimized for improved surface integrity of machined thermoplastic components.

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Cryogenic machining of porous tungsten for enhanced surface integrity

Cited by 32 publications

References 14 publications

Experimental study on chip deformation of Ti-6Al-4V titanium alloy in cryogenic cutting

Experimental study on chip deformation of Ti-6Al-4V titanium alloy in cryogenic cutting

Advanced Processing and Machining of Tungsten and Its Alloys

Characterization and Modeling of Surface Roughness and Burr Formation in Slot Milling of Polycarbonate

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