Cutting Tool Temperature Analysis in Heat Pipe Assisted Composite Machining  

Oleh:

Jie Liu ; Kevin Chou, Y.

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Journal of Manufacturing Science and Engineering vol. 129 no. 5 (Oct. 2007), page 902-910.
Topik: Composite; Machining; Cutting Tool; Temperature; Heat-Pipe

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ93.10 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

Lihat Detail Induk

Isi artikel

Machining of adavanced materials such as encounters high cutting temperature and rapid tool wear because of abrasive nature of reiforment phases in the workpiece materials. Ultrahard coatings, suvch as chemical vapor deposition diamond-coated tool is characterised by catastrophic coating failure, plausibly due to the high stress developed at the coating-substrate interface at high temperaures becauses of very different elastic moduli and thermal expansion coefficients. Temperature reductions, therefore, may delay the onset of the coating failure and offer tool life extension. Though it is intuitive that heat transfer enhanced by by the may reduce tool life extension.the heat-pipe cooling effectiveness.Though it is intuitive that heat transfer enhanced by the heat pipe may reduce tool temperatures, the heat pipe will likely increase heat partitioning into the tool at the rake face, and complicate the temperature reduction effectiveness. A combined experimental, analytical, and numerical approach was used to investigate the heat-pipe effects on cutting tool temperatures. A machining experiment was conducted and the heat-source characteristic were analyzed using cutting mechanics. With the heat sources as input, cutting tool finite element simulations. The simulations encompass a 3-D model of a cutting tool system and a 2-D chip model. The heat flux over the rake-face contact area was used in both models with an unknown heat partition coefficient, determined by matching the average temperature at the tool-chip contact from the two models. Cutting tool tefinite element simulations. The simulations encompass a 3-D model of a cutting tool system and a-2D chip model. The heat flux over the rake-face contact area was used in both models with an unknown heat partition coefficient determined by matching the both models with an unknown heat partition coefficient, determined by matching the average temperature at the tool-chip contact from the two models. Cutting tool temperatures were also measured in machining using thermocouples. The simulation results agree reasonably with the experiment. The model was used to evaluate how the heat pipe modifies the heat transport in a cutting tool system. Applying heat-pipe cooling inevitably increases the heat flux into the tool because of the enhanced dissipation. However, the heat pipe is still able to reduce the tool-chip contact temperatures, though not dramatically at current settings. The parametric study using the finite element analysis (FEA) models shows that cooling efficiency decreases as the cutting speed and feed increase, because of the increased heat flux and heat-source area. In addition, increasing the heat-pipe volume and decreasing the heat-source area. In addition, increasing the heat-pipe volume and decreasing distance to the heat source enhances the heat-pipe cooling effectiveness.[DOI:10.1115/1.2752528]

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