旋转超声加工对TiBw网状钛基复合材料表面残余应力的影响  

Effect of rotary ultrasonic machining on surface residual stress of TiBw mesh titanium-based composites

作　　者：董国军[1] 郭志清 代勇[1] 赖睿达 刘荣松 DONG Guojun;GUO Zhiqing;DAI Yong;LAI Ruida;LIU Rongsong(School of Mechatronics Engineering,Harbin Institute of Technology,Harbin 150001,Heilongjiang,China)

机构地区：[1]哈尔滨工业大学机电工程学院,黑龙江哈尔滨150001

出　　处：《陕西师范大学学报（自然科学版）》2024年第2期8-13,共6页Journal of Shaanxi Normal University：Natural Science Edition

基　　金：国家自然科学基金(52075127)。

摘　　要：为研究不同切削条件下旋转超声加工对材料表面残余应力的影响,选取硼化钛晶须(TiB whiskers,TiBw)网状钛基复合材料为实验对象,使用镍基电铸金刚石砂轮进行旋转超声加工,并分析了加工后材料的表面残余应力。结果表明:由于钛基复合材料具有网状结构和优异的高温性能,使切削热和微观相变产生的残余应力较小,磨粒机械作用产生的残余应力更大。随着超声振动的引入,磨粒高频冲击工件表面,使旋转超声加工工件表面残余应力均大于普通磨削。在主轴转速n=9000 r/min,进给速度v f=8 mm/min,加工深度a p=25μm的加工参数下,旋转超声加工工件表面存在-540 MPa的残余压应力,随着主轴转速增大,残余应力显著减小,并且残余应力的影响层深度逐渐减小。超声振动的引入增大工件表面残余压应力,提高材料抗疲劳性能。In order to study the effect of rotary ultrasonic machining on the residual stress on the material surface under different cutting conditions,the TiB whiskers(TiBw)reticulated titanium matrix composites were selected as the experimental objects,and the surface residual stress of the machined materials was analyzed by rotary ultrasonic machining with nickel-based electroforming diamond grinding wheel.The results show that due to the network structure and excellent high temperature properties of titanium matrix composites,the residual stress caused by cutting heat and microscopic phase transformation is small,while the residual stress caused by abrasive mechanical action is larger.With the introduction of ultrasonic vibration,abrasive particles impact the workpiece surface at high frequency,which makes the residual stress on the workpiece surface of rotary ultrasonic machining greater than that of ordinary grinding.Under the machining parameters of spindle speed n=9000 r/min,feed speed v f=8 mm/min and machining depth a p=25μm,a residual compressive stress of-540 MPa exists on the surface of the rotary ultrasonically machined workpiece,and with the increase of spindle speed,the residual stress decreases significantly,and the influence layer depth of residual stress decreases gradually.The introduction of ultrasonic vibration increases the residual compressive stress on the workpiece surface and improves the fatigue resistance of materials.

关 键 词：旋转超声加工 TiBw网状增强钛基复合材料 残余应力 

分 类 号：TB559[理学—物理]