摘要
为了分析炸药材料切削加工过程中切削力响应规律及加工特性,采用低速正交切削试验的方法,结合显微摄像、三向测力仪和三维表面轮廓仪表征测试,分析高聚物粘结炸药(PBX)炸药模拟材料瞬时切削力特性,研究PBX炸药模拟材料的切削过程中切削力响应规律及其关键影响因素。结果表明,不同的切削深度PBX炸药模拟材料的动态切削力变化规律不同,切深为0.1 mm时的切削力峰值变化主要由颗粒切屑成型引起,切屑呈蜷曲喷射状,切削力曲线呈微细锯齿状动态特征变化,切深为0.3 mm和0.5 mm时的切削力峰值主要由材料脆性断裂裂纹扩展引起,切削力呈周期性的大锯齿特性变化,fz在过切凹坑处降至零。fx标准偏差在0.4 mm切深处产生显著变化,反映了炸药模拟材料切削状态由连续去除到脆性去除的转变。低速正交切削下,切削宽度对切削力影响大于切削速度对切削力的影响,切削速度对切削力的影响较小。
In order to analyze the cutting force response laws and cutting characteristics during PBX cutting process,the lowspeed orthogonal cutting experiments,combined with the microphotography,3 D dynamometer and 3 D surface profiler,were used to analyze the characteristics of instantaneous cutting force of PBX explosive simulants,and to study the cutting force response laws and key influencing factors in the cutting process of PBX explosive simulants. Results show that the dynamic cutting forces of PBX explosive simulants with different cutting depths are different. When cutting depth equals to 0.1 mm,the variation of peak cutting force is mainly caused by particles chip with curled up jet,and the cutting force curve exhibits subtle jagged variation. However,when the cutting depth equals to 0.3 mm or 0.5 mm,the peak cutting force mainly comes from the extension of material brittle fracture crack,the cutting force curve shows periodic large saw-tooth shape,and the zero point of fz is at the over-cutting dent. The standard deviation of fxshows significant variation at the cutting depth of 0.4 mm,which reflects the transition from continuous removal to brittle removal in the cutting state of explosive simulated materials. In low speed orthogonal cutting process,the influence of cutting width on cutting force is greater than that of cutting speed,and the cutting speed has little effect on cutting force.
作者
谢凤英
张中伟
黄交虎
刘维
肖才伟
XIE Feng⁃ying;ZHANG Zhong⁃wei;HUANG Jiao⁃hu;LIU Wei;XIAO Cai⁃wei(Institute of Chemical Materials,CAEP,Mianyang 621999,China)
出处
《含能材料》
EI
CAS
CSCD
北大核心
2020年第2期151-156,共6页
Chinese Journal of Energetic Materials
基金
国家自然科学基金(51505441)
国家科技重大专项(2017ZX04011001)
关键词
炸药模拟材料
正交切削
瞬时切削力
切削深度
切削力响应
explosive simulants
orthogonal cutting
instantaneous cutting force
cutting depth
cutting force response
