Inverse Approach to Derive the Distribution of Convection Heat Transfer Coefficient of Grinding Fluid within Grinding Zone for Deep Grinding of Nickel Based Super Alloy

doi:10.3901/JME.2022.15.055

Abstract

Abstract: Theoretical and experimental study has been conducted under creep-feed grinding mode, using a porous metal bond CBN wheel and an oil-based grinding fluid, for the machining of a nickel based super alloy.An inverse heat transfer approach is proposed to derive the distribution of CHTC(convection heat transfer coefficient) in the grinding zone under deep grinding conditions, based on the measured grinding temperature signals and the circular-arc contact moving heat source model.Under creep-feed grinding mode, the CHTC distribution along the grinding zone presents a rather different pattern compared to that in the conventional shallow-cut grinding, at a small region of the front grinding zone, the CHTC shows a sharp rising curve, whilst in the main heat exchange area, the CHTC changes rather smoothly.The change of contact arc length and feed rate has little effect on the distribution of CHTC in the main heat exchange area, and the grinding speed is the main factor affecting the CHTC.As the grinding speed is in the range of 28-42 m/s, the global CHTC is about 23 000 to 25 000 W/m²·K, when the grinding speed increases to 50 m/s, the CHTC shows a modest decrease, down to about 16 000 to 19 000 W/m²·K.Present study shows that, using a porous metal bond CBN wheel and oil-based grinding fluid, effective convective cooling can be achieved under large grinding contact arc lengths.

Key words: nickel based super alloy, porous metal bond wheel, grinding fluid, convection heat transfer coefficient, creep-feed grinding

CLC Number:

TG156

JIN Tan, MA Xin, HU Hao, QU Meina, SHANG Zhentao. Inverse Approach to Derive the Distribution of Convection Heat Transfer Coefficient of Grinding Fluid within Grinding Zone for Deep Grinding of Nickel Based Super Alloy[J]. Journal of Mechanical Engineering, 2022, 58(15): 55-62.

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