Analytical and Thermal Modelling of High-Speed Machining With Chamfered Tools  

Oleh:

Karpat, Yigit ; Ozel, Tugrul

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Journal of Manufacturing Science and Engineering vol. 130 no. 1 (Feb. 2008), page 1-15.
Topik: Thermal Modeling; Chamfered Tools; Friction Factor; Dead Metal Zone; High-Speed Machining; Slip Line Field Analysis

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ93.11 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

High-speed machining offers several advantages such as increased flexibility and productivity for discrete-part manufacturing. However, excessive heat generation and resulting high temperature on the tool and workpiece surfaces in high-speed machining leads to a shorter tool life and poor part quality, especially if the tool edge geometry and cutting conditions were not selected properly. In this study, analytical and thermal modelling of high-speed machining with chamfered tools in the presence of dead metal zone has been presented to investigate the effects of cutting conditions, heat generation, and resultant temperature distributions at the tool and in the workpiece. An analytical slipline field model is utilized to investigate the process mechanics and friction at the toolchip and tool-workpiece interfaces in the presence of the dead metal zone in machining with a ngeative rake chamfered polycrystalline cubic boron nitride tool. In order to identify friction conditions, a set of orthogonal cutting tests is performed on AISI 4340 steel and chip geometries and cutting forces are measured. Thermal modelling of machining with chamfered tools based on moving band heat source theory, which utilizes the identified friction conditions and stress distributions on the tool-chip and tool-workpiece interfaces, is also formulated and temperature distributions are compared with the result obtained from finite element simulations. The comparison of temperature fields indicates that the proposed model provides reasonable solutions to understand the mechanics of machining with chamfered tools. Models presented here can be further utilized to optimize the tool geometry and cutting conditions to increasing benefits that high-speed maching offers

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