Abstract

In the present investigation, water based multi-walled carbon nanotube (MWCNT) dispersed nanofluid was produced and used as a cutting fluid in small quantity cooling lubrication (SQCL) assisted grinding of hardened AISI52100 steel. The work material was ground by an alumina wheel. The SQCL technology utilizes atomized aerosol of liquid grinding fluid. Use of MWCNT nanofluid aerosol in place of soluble oil was found to be substantially beneficial in reduction of specific energy and development of compressive residual stress on ground surface. The steady and lower value of the force ratio (tangential to normal grinding force, F_t/F_n) was suggestive of the superior lubrication and grit sharpness retention ability of the aerosol of MWCNT nanofluid. Higher compressive residual stress on the ground surface under MWCNT nanofluid environment suggests lesser grinding zone temperature, which can be attributed to its superior wettability, lubricity and heat dissipation ability of the MWCNT nanofluid. The consumption rate of grinding fluid in SQCL was varied. It could be reduced to 200 ml/h for MWCNT nanofluid to obtain an almost similar or better effect to that of 500 ml/h for soluble oil. Lesser surface tension of MWCNT nanofluid, compared to its counterpart, seemed to facilitate wetting, thus improving lubrication and heat transfer capability further.

摘要

在本研究中，生产了水基多壁碳纳米管 (MWCNT) 分散的纳米流体，并将其用作少量冷却润滑 (SQCL) 辅助磨削硬化 AISI52100 钢的切削液。工作材料由氧化铝轮研磨。SQCL 技术利用液体研磨液的雾化气溶胶。发现使用 MWCNT 纳米流体气溶胶代替可溶性油对降低比能和在地表上产生压缩残余应力大有裨益。力比的稳定值和较低值（切向法向磨削力，F _t /F _n) 表明 MWCNT 纳米流体的气溶胶具有优异的润滑性和砂砾锋利度保持能力。在多壁碳纳米管纳米流体环境下，地面上较高的残余压应力表明研磨区温度较低，这可归因于多壁碳纳米管纳米流体优越的润湿性、润滑性和散热能力。SQCL中磨削液的消耗率各不相同。对于 MWCNT 纳米流体，它可以降低到 200 毫升/小时，以获得与可溶性油的 500 毫升/小时几乎相似或更好的效果。与其对应物相比，MWCNT 纳米流体较小的表面张力似乎有利于润湿，从而进一步提高润滑和传热能力。