Abstract
In situ TiB2 particle-reinforced 7050Al alloy matrix composites are a new category of particulate metal matrix composites with improved mechanical and physical properties. At present, the study of machining in situ TiB2/Al composite is limited and no specific study has been presented on cutting force. Based on previous work, experimental investigation of cutting in situ TiB2/Al composite was carried out in this study to investigate the cutting force, shear angle, mean friction angle, and shear stress. The results indicated that the feed rate, instead of cutting speed, has a significant influence on the shear angle, mean friction angle, shear stress, and forces, which is different from cutting ex situ SiC/Al composites. Meanwhile, based on Merchant’s theory, a force model, which consists of chip formation and ploughing force, was established to have a better understanding of force generation. A comparison of the results show an acceptable agreement between the force model and experiments. Additionally, at varying feed rates, the linear relationship between the shear angle and mean friction angle is still suitable for cutting in situ TiB2/7050Al alloy composites.
Highlights
Particle-reinforced metal matrix composites (PRMMCs) play an important role in modern industry and tend to replace conventional metal materials due to their superior mechanical and physical properties, such as improved strength, low density and cost, perfect low-temperature performance, and increased wear resistance [1]
In Davim’s model, the ex situ SiC/Al composite was treated as an equivalent homogenous material without justification
The force, shear angle, mean friction angle, shear stress, and normal stress were researched in cutting in situ TiB2 /7050Al alloy composite
Summary
Particle-reinforced metal matrix composites (PRMMCs) play an important role in modern industry and tend to replace conventional metal materials due to their superior mechanical and physical properties, such as improved strength, low density and cost, perfect low-temperature performance, and increased wear resistance [1]. It is found from many studies that, with hard ceramic particles (e.g., SiC, TiB2 , Al2 O3 ), the tool wear is terrible and the cutting force is large, which makes machining PRMMCs complex. In order to have a deep insight into the cutting mechanism of PRMMCs, a large number of studies have been carried out on cutting force and force modeling. Jenarthanan and Krishnamurthy investigated the metal removal rate of machining in situ TiB2 /Al composites, respectively [8,9]. They both concluded that cutting speed and feed have a dominant effect on material removal rate. Mahamani and Anandakrishnan researched the influence of cutting parameters and the reinforcement ratio on tool
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