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织构刀-屑界面滑移区微通道特性数值研究
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国家自然科学基金项目 (U1804142); 河南省科技攻关项目 (192102210216).


Numerical Investigation of Microchannel Characteristics in Slipping Zone of Textured ToolChip Interface
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    摘要:

    刀-屑界面滑移区的接触及微通道分布特性直接影响切削液的渗入和刀-屑界面摩擦,对金属切削过程有着重要的影响,针对滑移区接触及微通道分布特性测量难、切削液在刀-屑界面渗入不易量化等问题,建立微织构粗糙刀-屑界面滑移区的接触数值模型,分析滑移区的接触、微通道分布特性以及微织构作用机制。研究表明:滑移区存在3种不同的宏观接触特性,分别为近黏结特性、微通道特性和近分离特性;在近黏结特性区内,刀-屑界面不存在微通道,微织构主要功能为减少刀-屑界面接触面积;在微通道特性区内,刀-屑界面存在大量微通道,微织构主要功能为连接微通道;在近分离特性区内,刀-屑界面微通道消失,微织构主要功能为存储切削液。刀-屑界面应力分布系数对各特性区长度有影响,应力分布系数减小,近黏结区和微通道区长度增大,而近分离区长度相应减小。

    Abstract:

    The slipping zone characteristics occurring in the toolchip interface play an important role in controlling the cutting fluid infiltration and toolchip tribological characteristics and the quality of workpiece.The numerical model of the slipping zone in toolchip interface was established for the reason of difficult to quantify the cutting fluid infiltration in the toolchip interface and measure the sliding contact characteristics and microchannel distribution.The sliding contact characteristics and microchannel distribution and the mechanism of microtexture in the tool surface were analyzed.The results show that there are three different types of macroscopic contact characteristics in slipping zone of the toolchip interface,which are nearly bonding characteristic,microchannel distribution characteristic and nearly separation characteristic.The mechanism of microtexture in the tool rake face is to reduce the contact area because of no microchannels in the nearly bonding zone,to connect the microchannel because of the large quantity microchannels in the microchannels distribution zone,and to store the cutting fluid because of the disappearance of microchannels in the nearly separation characteristic zone.The stress distribution coefficient of the toolchip has an obvious effect on the length of each characteristic region.With the drcreasing of stress distribution coefficient,the contact length is increased in the nearly bonding zone and microchannels distribution zone,and is decreased in the nearly separation characteristic zone.

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逄明华,申福猴,聂永芳,马利杰.织构刀-屑界面滑移区微通道特性数值研究[J].润滑与密封,2019,44(3):30-36.
. Numerical Investigation of Microchannel Characteristics in Slipping Zone of Textured ToolChip Interface[J]. Lubrication Engineering,2019,44(3):30-36.

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  • 在线发布日期: 2019-07-04
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