Jieshi CHEN
,
Xianbin ZHOU
材料科学技术（英文）
The forming limit curve (FLC) can be obtained by means of curve fitting the limit strain points of different strain paths. The theory of percent regression analysis is applied to the curve fitting of forming limit experimental data. Forecast intervals of FLC percentiles can be calculated. Thus reliability and confidence level can be considered. The theoretical method to get the limits of limit strain points distributing region is presented, and the FLC position can be adjusted according to practical requirement. Method for establishing FLC with high reliability using small samples is presented at the same time. This method can make full use of the current experimental data and the previous data. Compared with the traditional method that can only use current experimental data, fewer specimens are required in the present method to obtain the same precision and the result is more accurate with the same number of specimens.
关键词:
Forming limit curve
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null
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null
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胡立湘
,
李鹏南
,
陈明
,
邱新义
宇航材料工艺
doi:10.3969/j.issn.1007-2330.2016.02.011
采用TiAIN涂层硬质合金麻花钻对钛合金(TC4)进行钻削试验,研究了切削用量对轴向力、加工孔壁表面粗糙度和切屑形态的影响.结果表明:轴向力随着进给量的增加而增加,轴向力随着转速的增加而减小.运用指数公式模型对轴向力实验结果进行回归分析,得到轴向力与转速以及进给量之间的关系式,并对该方程进行了检验验证误差均小于7％;随着进给量的增加断屑能力逐渐增加,切屑长度逐渐变短.在低转速和进给量为50 mm/min时切屑形态为短螺旋形切屑,此时排屑和孔壁粗糙度均为最佳.
关键词:
钛合金
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切削用量
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轴向力
,
回归分析
,
切屑形态
,
孔壁表面粗糙度
胡立湘
,
李鹏南
,
陈明
,
邱新义
宇航材料工艺
doi:10.12044/j.issn.1007-2330.2017.03.019
采用硬质合金麻花钻对CFRP-TC4叠层板进行钻削试验,分析了钛合金层加工参数对钻削力、钻削温度和加工孔质量的影响.结果表明:随着转速的增加,钛合金层的轴向力逐渐减小;随着钛合金层进给量的增加,钛合金层与CFRP层的轴向力之比逐渐增加.运用指数公式模型对钛合金层轴向力实验结果进行回归分析,得到轴向力与转速以及进给量之间的关系式:Fz=2 088n-01222 ·fr.2016,并对该方程进行了检验验证,误差均小于10％;在钛合金层进给量不变时,随着钛合金层转速的增加,CFRP的最大烧伤环直径和层间最高温度逐渐增加.
关键词:
钻削
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轴向力
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层间温度
,
回归分析
,
烧伤环
