The Study on the Thermal Characteristic and Cutting Force of Laser-Assisted Machining for Sapphire (Al2O3) Material

雷射輔助加工藍寶石材料（Al2O3）之熱性質與切削力研究

郭春寶(Chun-Pao Kuo) ； 林其德(Chi-Der Lin)

《中國機械工程學刊》 33卷4期 (2012/08) Pp. 357-363

https://doi.org/10.29979/JCSME.201208.0009

摘要

雷射輔助加工技術主要利用高能雷射在材料被移除前進行局部加熱，此方法不僅提供另一種高材料移除率的前瞻加工技術，更能針對一些特殊材料來改善加工後之特性及形狀，尤其是針對如陶瓷（ceramics）等難切削材料。本研究主要探討應用雷射輔助加工技術，來對特殊難切削材料（如Inconel-718、氧化鋁陶瓷等）進行加工。其概念為應用精密聚焦及能量控制之雷射將工件表面局部預熱，使表面達到材料軟化溫度，再以CBN或鑽石等耐高溫、高硬度刀具進行切削，可有效降低切削力、減少刀具磨耗，相對地提升刀具壽命，進而提升材料移除率（M.R.R.），甚至提高表面精度。其另一優點在於雷射光束範圍小，可減少對工件之熱影響。

並列摘要

The Laser-assisted machining technique mainly utilizes high laser power to heat local area before material was removed. It can raise the surface temperature of workpiece immediately and soften the material with input laser heat. Then material is transformed from brittle into ductile and it's suitable for cutting. It efficiently reduces the cutting force and the tool wear, and relatively promotes the tool life and material removal rate, even the surface precision. The other advantage is the small range of laser spot, and it reduces thermal affection to workpiece and reduces thermal stress caused by laser power to minimum degree.In order to control the surface temperature of workpiece by laser more accurately, and maintain material within the elastic-plastic deformation region, the heat transfer model of pulsed laser heating was developed to simulate the temperature distribution of the material in the process of laser assisted machining. Results are of good agreement with experimental data and heat transfer equation is confirmed to simulate truly the heat distribution of laser-assisted machining system.

並列關鍵字

Ceramics ； Cutting force ； Laser-assisted machining