Effect of h-BN on the turning performance of high-strength vermicular graphite cast iron

Lin, Yongchuan; Zhou, Yufeng; Ji, Quanxin; Huang, Jing; Lai, Debin; He, Shengjian; Zhu, Nengyi

doi:10.1007/s00170-021-06750-y

Cited by 3 publications

(2 citation statements)

References 31 publications

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“…[16][17][18][19] Then wear behaviors, such as the abrasive wear, adhesive wear, diffusion wear, and oxidation wear on the rake face and flank face of cutting tools, are usually experimentally studied. [20][21][22] Scanning electron microscope (SEM) and energy dispersion spectrum (EDS) are usually conducted to analyze the micrograph of worn area. [23][24][25] For free-cutting steels, wear behavior and tool life can also be investigated using SEM and EDS analysis of worn out inserts.…”

Section: Introductionmentioning

confidence: 99%

Study on the tool life analysis for free-cutting steels

Zhang

Yang

Tang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part B:

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Experimental study and theoretical calculation on the tool lives of free-cutting steels with different additions were carried out in terms of the friction characteristics, chip deformation, and normal stress distribution. The average friction coefficient, shear angle, and maximum normal stress were then calculated, and the influence of them on tool life was analyzed and discussed carefully. The free-cutting steel with Bi addition (MB) presented the best tool life of about 9200 and 5200 s at the speed of 150 and 200 m/min, respectively, which was mainly due to the combined effect of the lower average friction coefficient, maximum normal stress, and higher shear angle. When the cutting speed increased to 300 m/min, the tool life decreased rapidly, which was mainly caused by the serious tool wear behavior dominated by the high cutting temperature. Differing from the calculated results of shear angles based on Lee and Shaffer’s assumption, the measured shear angles decreased with the cutting speed ranging from 150 to 250 m/min, resulting from the thermal softening of workpiece material during machining. Moreover, the present findings indicated that the cutting process became unstable when the maximum normal stress on the tool nose was larger than 2 GPa, where catastrophic failures occurred, resulting in accelerated fracture of the tool. The research findings not only give more insight into the effect of friction characteristics, chip deformation, and normal stress distribution on the tool lives, but also have significance for the machining of free-cutting steels.

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Section: Introductionmentioning

confidence: 99%

Study on the tool life analysis for free-cutting steels

Zhang

Yang

Tang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…Therefore, they are more suitable for manufacturing large and medium-sized engines. However, the high tensile strength of CGI means that machining requires greater cutting force, high toughness makes it difficult to remove metal and low thermal conductivity leads to difficult heat dissipation and short service life of tools [ 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Tool Coatings on Machining Properties of Compacted Graphite Iron

Tan

et al. 2022

Micromachines

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Compacted graphite iron (CGI) has become the most ideal material for automotive engine manufacturing owing to its excellent mechanical properties. However, tools are severely worn during processing, considerably shortening their lifespan. In this study, we prepared a series of cemented carbide-coated tools and evaluated their coating properties in cutting tests. Among all tested coatings, PVD coating made of AlCrN (AC) presented with the best surface integrity and mechanical properties, achieving the best comprehensive performance in the coating test. The AC-coated tool also exhibited the best cutting performance at a low speed of 120 m/min, corresponding to a 60% longer cutting life and the lowest workpiece surface roughness relative to other coated tools. In the cutting test at a high speed of 350 m/min, the CVD double-layer coated tool (MT) with a TiCN inner layer of and an Al2O3 outer layer had a 70% longer cutting life and the lowest workpiece surface roughness relative to other coated tools.

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