吴书安,祝锡晶,郭策.基于热力耦合的单磨粒临界磨削仿真分析[J].表面技术,2016,45(8):144-149.
WU Shu-an,ZHU Xi-jing,GUO Ce.Simulation Analysis of Critical Grinding of Single Grain Based on the Thermo-Mechanical Couple[J].Surface Technology,2016,45(8):144-149
基于热力耦合的单磨粒临界磨削仿真分析
Simulation Analysis of Critical Grinding of Single Grain Based on the Thermo-Mechanical Couple
投稿时间:2016-04-20  修订日期:2016-08-20
DOI:10.16490/j.cnki.issn.1001-3660.2016.08.024
中文关键词:  单磨粒  刃圆半径  磨削深度  有效流动应力  热效应  临界磨削
英文关键词:single grain  edge radius  grinding depth  effective flow stress  heat effect  critical grind
基金项目:国家自然科学基金项目(51275490);中北大学研究生科技基金项目(20151215)
作者单位
吴书安 中北大学 机械与动力工程学院,太原 030051 
祝锡晶 中北大学 机械与动力工程学院,太原 030051 
郭策 中北大学 机械与动力工程学院,太原 030051 
AuthorInstitution
WU Shu-an School of Mechanical and Power Engineering, North University of China, Taiyuan 030051, China 
ZHU Xi-jing School of Mechanical and Power Engineering, North University of China, Taiyuan 030051, China 
GUO Ce School of Mechanical and Power Engineering, North University of China, Taiyuan 030051, China 
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中文摘要:
      目的 通过仿真研究磨削中单磨粒几何特征对切屑根部材料分离的影响,得到脆-塑转变的临界磨削参数值。方法 针对Ti6Al4V合金,通过对单磨粒划擦的分析,建立热-力耦合平面仿真模型,研究切屑根部有效流动应力随单磨粒刃圆半径和磨削深度的变化情况。结果 在磨粒刃口处,刃圆半径r=0.1 μm时,磨削深度h0.02 μm,出现脆-塑转变的临界现象;在h>0.3 μm时,可能会实现材料的塑性去除,磨削热效应对其有促进作用。刃圆半径r=1 μm时,磨削深度h为0.2~3 μm,有效流动应力的最小值为948.479 MPa,此时在磨粒刃口处几乎没有材料塑性流动的现象,磨削热效应不明显。刃圆半径r=10 μm时,磨削深度h为2~30 μm,有效流动应力的最小值为716.351 MPa,最大值为763.59 MPa,磨粒刃口处切屑以塑性流动方式产生,磨削热对其有一定的促进作用。结论 仿真得出使切屑根部材料实现塑性流动的单磨粒刃圆半径、磨削深度阈值范围和脆-塑转变的临界值,同时得到磨削热效应对切屑形成的作用效果。取刃圆半径为0.1 μm或者10 μm左右的磨粒,适当增大磨削深度,可实现切屑根部材料的塑性流动,降低对磨粒的冲击作用,并提高磨削效率。
英文摘要:
      Objective To study the effect of the single grain’s geometric features for the material separation on cut root by simulation and get the critical grinding parameter values of brittle-ductile transition. Methods For the Ti6Al4V alloy, the thermal-force coupling plane simulation model was established through the analysis of single grain scratch to study the relationship of the effective flow stress along with the single grain edge radius and the grinding depth in the end of the cutting chip. Results On the grain’s blade edge, the critical phenomenon of brittle-ductile transition appeared when edge radius r was 0.1 μm and grinding depth h was about 0.02 μm; when h was >0.3 μm, the material’s plastic removal might be removed, which should be promoted by the grinding heat effect. When the radius of cutting edge r was 1 μm and the grinding depth was h was 0.2~3 μm, the minimum value of effective flow stress was 948.479 MPa. At this time, there was no material plastic flow at the grinding blade edge, and the grinding thermal effect was not obvious. When edge radius r was 10 μm and grinding depth h was about 2~30 μm, the minimum effective flow stress was 716.351 MPa and the maximum value 763.59 MPa, and the chips on blade edge were generated in plastic flow, which was promoted by the grinding heat effect. Conclusion The threshold range of plastic flow and the critical value of brittle-plastic transition are got in simulation process, and the effect of the grinding thermal effect on the formation of the chip is also obtained. Use of grains with edge radius of 0.1 μm or about 10 μm and proper increase of grinding depth can realize the plastic flow of the material, reduce the impact on the grain and improve the grinding efficiency.
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