The Effect of Cutting Parameters on Surface Integrity in Milling Ti6al4v

Oosthuizen, Tiaan; Nunco, Keshav; Conradie, Pieter; Dimitrov, Dimiter M.

doi:10.7166/27-4-1199

Cited by 28 publications

(14 citation statements)

References 15 publications

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“…A similar procedure performed in a previous work showed an increase in hardness after machining at a level similarly close to the surface; however, the material was made from powder metal with a Ti-6Al-4V matrix [49]. Other previous work reported a softening effect when machining Ti-6Al-4V [50][51][52][53][54] which was explained by a phenomenon attributed to over-aging [50][51][52]. Other explanations were the transformation of the β phase near the surface in combination with the stress relaxation due to the cyclic temperature [53].…”

Section: Residual Stressmentioning

confidence: 88%

“…Other previous work reported a softening effect when machining Ti-6Al-4V [50][51][52][53][54] which was explained by a phenomenon attributed to over-aging [50][51][52]. Other explanations were the transformation of the β phase near the surface in combination with the stress relaxation due to the cyclic temperature [53]. The nature of the edge effect was also reported, which may result in lower hardness values [54]; however, this work involved nano-hardness indentations performed very close to the surface (at approximately 1 µm).…”

Section: Residual Stressmentioning

confidence: 99%

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Variations in the Surface Integrity of Ti-6Al-4V by Combinations of Additive and Subtractive Manufacturing Processes

et al. 2020

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Additive manufacturing (AM) has recently been accorded considerable interest by manufacturers. Many manufacturing industries, amongst others in the aerospace sector, are already using AM parts or are investing in such manufacturing methods. Important material properties, such as microstructures, residual stress, and surface topography, can be affected by AM processes. In addition, a subtractive manufacturing (SM) process, such as machining, is required for finishing certain parts when accurate tolerances are required. This finish machining will subsequently affect the surface integrity and topography of the material. In this research work, we focused on the surface integrity of Ti-6Al-4V parts manufactured using three different types of AM and finished using an SM step. The aim of this study was to gain an understanding on how each process affects the resulting surface integrity of the material. It was found that each AM process affects the materials’ properties differently and that clear differences exist compared to a reference material manufactured using conventional methods. The newly generated surface was investigated after the SM step and each combination of AM/SM resulted in differences in surface integrity. It was found that different AM processes result in different microstructures which in turn affect surface integrity after the SM process.

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Section: Residual Stressmentioning

confidence: 88%

Section: Residual Stressmentioning

confidence: 99%

Variations in the Surface Integrity of Ti-6Al-4V by Combinations of Additive and Subtractive Manufacturing Processes

et al. 2020

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“…Chatter can also happen from vibration that arises from the motion between tool and workpiece. In addition, spring back in titanium further complement the effect of machining tolerance as the material flex during the cutting edge touches the workpiece during machining process and causes the workpiece to move away from the cutting tool [10]. Vibration and noise emission was also generated from the instability of the cutting process.…”

Section: Fig 5 Section and Location Of The Inspection Areamentioning

confidence: 99%

Effect of Different Cutting Speed towards Machinability of Titanium (Ti6Al4V) Curved Thin Wall using Trochoidal Milling Path

Yusop¹,

Said²,

Karim³

et al. 2019

IJEAT

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Aircraft parts and components used a lot of titanium as the material for body parts and engines. The materials offer rigidity, strength and light in weight. This unique characteristic was the major advantages in improving the payload capacity and improving the fuel consumption of the jet engines. The problem raised during the machining process of the material. Titanium is a hard material, elastic and poor thermal conductor. As the material is hard, higher machining force is required to perform the machining. Elasticity added the difficulties as it will spring away from the cutting tool which cause the tool to rub instead of cutting that can increased the heat. Thus, machining titanium alloy is expensive and difficult. This preliminary study looks into several machinability aspects and machining parameters for curved thin wall machining profile in the research. Machining accuracy and cutting tool wears were observed during the experiments. There are two set of machining parameters for the machining trials. At the same time, this research able to recommend the suitable machining parameters analysed from the experiments.

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“…1. Microstructure of subsurface deformation [9,11] The change of the microstructure in the layer (A) is significant, because force is enhanced by high temperatures on the surface finish. In layer (B), the level of temperature-force influence is not so significant.…”

mentioning

confidence: 99%

“…To check the formulated hypotheses, a multivariate regression analysis [8] of the results of experimental [9,11,12,13] studies of the milling end mills was carried out. As the parameter of the analyzed state of the surface layer of articles made of titanium (Тi-6Al-4V) alloy, the arithmetic mean deviation of the microroughness Ra is considered.…”

mentioning

confidence: 99%

Influence of technological factors of blade processing on the forming of the defect layer

Tchigirinsky

Quang

2017

MATEC Web Conf.

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Abstract. Identified the interrelationships between the depth of the surface layer with modified physicalmechanical properties (defective or work-hardened or fill hard layer), the parameters of cutting process, and the properties of materials of tool and workpiece. Justified the necessity of research the processes of formation the properties of the machined surface from the standpoint of the thermo-physics of the cutting process.The formation of subsurface deformation is an attribute of the wedge cutting process. The subsurface deformation significantly affects on the resistance to corrosion and other performance properties of the product. A number of researchers [2,3,5] notes that in the surface layer, in addition to changes in physical and mechanical characteristics of the material, such as microhardness, strength and ductility may also change in the crystal structure. As a rule, the condition of the subsurface deformation is evaluated by two basic indicators: the depth and degree of hardening. The degree of hardening is defined [2] as the change in the microhardness of the surface layer in relation to the original material. In the studies of A. D. Makarov, L. G. Odintsova and other authors [2,3,12] identified the main reasons for the formation of the layer with modified physical and mechanical properties -the combined effects of cutting forces and increased temperature induced during a machining. At research by N. V. Talantov [4] and his students proved that the formation of the deformed layer is greatly influenced by the friction at the rake surface and rear surface of the tool, forces and temperature processes in the primary shear zone, temperature and diffusion processes of the "blank-tool" and "chip-tool". All of these factors are the result of the influence of independent technological conditions of a metal cutting process: physical-mechanical properties of materials of the tool and the workpiece, the method of forming, cutting conditions (cutting speed, depth of cut, feed) and the geometric parameters of the cutting wedge.

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The Effect of Cutting Parameters on Surface Integrity in Milling Ti6al4v

Cited by 28 publications

References 15 publications

Variations in the Surface Integrity of Ti-6Al-4V by Combinations of Additive and Subtractive Manufacturing Processes

Variations in the Surface Integrity of Ti-6Al-4V by Combinations of Additive and Subtractive Manufacturing Processes

Effect of Different Cutting Speed towards Machinability of Titanium (Ti6Al4V) Curved Thin Wall using Trochoidal Milling Path

Influence of technological factors of blade processing on the forming of the defect layer

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