共查询到19条相似文献,搜索用时 15 毫秒
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利用单因素试验方法进行了密齿硬质合金涂层刀具铣削TC4钛合金试验,研究每齿进给量和切削速度对切削力、切削温度、加工表面粗糙度以及切屑形态的影响。结果表明:切削方向分力F_x、刀轴方向分力F_z随每齿进给量的增大而增大,进给方向分力F_y随每齿进给量的增加变化不大;切削速度小于75m/min时切削力随切削速度的增加下降较为明显;切削速度超过75m/min时切削力变化不大;切削温度受每齿进给量影响较大,且影响程度随进给量的增加而逐渐减小;随着每齿进给量f_z的增大,加工表面粗糙度值先减小后增大;在每齿进给量高于0.04mm/z时,密齿铣刀铣削TC4钛合金得到的切屑为螺卷状,且随每齿进给量的增加,切屑的曲率半径减小,随切削速度的增大,螺卷状切屑的螺距减小。 相似文献
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为了研究钛合金在铣削过程中切削力随着切削参数的变化规律,建立了三维斜角切削有限元模型。通过对材料本构模型,刀—屑接触摩擦模型和切屑分离准则等关键环节建模,采用通用有限元求解器ABAQUS/Ex-plicit对钛合金Ti6Al4V的斜角切削过程进行了模拟,获得了切削速度v、切削深度ap和每齿进给量fz对切削力的变化趋势及影响程度。模拟结果表明:切削力随着切削深度ap和每齿进给量fz的增大而增大,而随着切削速度增大切削力波动很小。切削深度对切削力的影响最大,进给量次之,切削速度对切削力的影响最小。该模型可以为切削参数的合理选择提供参考。 相似文献
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进行钛合金叶片加工时,切削力易导致加工变形,影响加工精度和表面质量。因此利用UG软件建立钛合金叶片和切削刀具的三维模型,采用仿真软件建立铣削仿真模型,研究分析了切削参数的变化对铣削力产生的影响。对仿真所得铣削力进行极差分析,判断切削参数对铣削力的影响情况,并通过实际铣削加工试验对比仿真数据验证其准确性和可行性,基于此仿真模型对切削参数对轴向力的影响程度进行了单因素分析。研究结果表明:铣削钛合金叶片时,切削参数对切削力的影响程度从大到小依次为切削速度、背吃刀量和每齿进给量;切削速度与轴向力成反比,每齿进给量和背吃刀量与轴向力成正比。 相似文献
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采用正交试验法研究CBN直柄平底立铣刀高速铣削20CrMnTi淬硬钢时切削参数对已加工表面粗糙度的影响。通过极差分析方法研究了切削参数对表面粗糙度的影响程度,通过单因素试验法得到了切削参数对表面粗糙度的影响规律,建立了基于指数函数的切削参数与表面粗糙度的关系模型。利用预测模型得出的表面粗糙度与试验的结果进行误差分析,说明所建立的模型能比较准确地对表面粗糙度进行预测。试验结果表明:各因素的影响程度从大到小依次为铣削深度、每齿进给量和切削速度,表面粗糙度随每齿进给量和铣削深度的增大而增大,随切削速度的增大而减小。 相似文献
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选用涂层硬质合金刀具对300M超高强度钢进行高速铣削试验,通过单因素试验和多因素正交试验法,得出铣削参数(主轴转速、每齿进给量、铣削深度)对切削力及表面粗糙度的影响规律及主次关系。对正交试验结果做最小二乘法分析,建立切削力及表面粗糙度与铣削参数之间的经验模型;对经验模型的回归方程及系数做显著性检验,并对其进行参数优化,得出铣削参数的最优组合。结果表明:主轴转速和铣削深度对切削力的作用较大,而每齿进给量对其影响相对较弱;每齿进给量对表面粗糙度作用最强,铣削深度次之,主轴转速对其作用最弱。 相似文献
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《机械工程学报(英文版)》2017,(1)
Titanium alloy is a kind of typical hard-to-cut material due to its low thermal conductivity and high strength at elevated temperatures, this contributes to the fast tool wear in the milling of titanium alloys. The influence of cutting conditions on tool wear has been focused on the turning process, and their influence on tool wear in milling process as well as the influence of tool wear on cutting force coefficients has not been investigated comprehensively. To fully understand the tool wear behavior in milling process with inserts, the influence of cutting parameters on tool wear in the milling of titanium alloys Ti6Al4 V by using indexable cutters is investigated. The tool wear rate and trends under different feed per tooth, cutting speed, axial depth of cut and radial depth of cut are analyzed. The results show that the feed rate per tooth and the radial depth of cut have a large influence on tool wear in milling Ti6Al4 V with coated insert. To reduce tool wear, cutting parameters for coated inserts under experimental cutting conditions are set as: feed rate per tooth less than 0.07 mm, radial depth of cut less than 1.0 mm, and cutting speed sets between 60 and 150 m/min. Investigation on the relationship between tool wear and cutting force coefficients shows that tangential edge constant increases with tool wear and cutter edge chipping can lead to a great variety of tangential cutting force coefficient. The proposed research provides the basic data for evaluating the machinability of milling Ti6Al4 V alloy with coated inserts, and the recommend cutting parameters can be immediately applied in practical production. 相似文献
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Titanium alloy is a kind of typical hard-to-cut material due to its low thermal conductivity and high strength at elevated temperatures, this contributes to the fast tool wear in the milling of titanium alloys. The influence of cutting conditions on tool wear has been focused on the turning process, and their influence on tool wear in milling process as well as the influence of tool wear on cutting force coefficients has not been investigated comprehensively. To fully understand the tool wear behavior in milling process with inserts, the influence of cutting parameters on tool wear in the milling of titanium alloys Ti6Al4V by using indexable cutters is investigated. The tool wear rate and trends under different feed per tooth, cutting speed, axial depth of cut and radial depth of cut are analyzed. The results show that the feed rate per tooth and the radial depth of cut have a large influence on tool wear in milling Ti6Al4V with coated insert. To reduce tool wear, cutting parameters for coated inserts under experimental cutting conditions are set as: feed rate per tooth less than 0.07 mm, radial depth of cut less than 1.0 mm, and cutting speed sets between 60 and 150 m/min. Investigation on the relationship between tool wear and cutting force coefficients shows that tangential edge constant increases with tool wear and cutter edge chipping can lead to a great variety of tangential cutting force coefficient. The proposed research provides the basic data for evaluating the machinability of milling Ti6Al4V alloy with coated inserts, and the recommend cutting parameters can be immediately applied in practical production. 相似文献
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利用2k因子试验设计和均匀试验设计方案,进行了硬质合金刀具高速铣削高强度钢的切削力试验,找出r埘切削力有重要影响的主效应及交互效应,建立了切削用量与动态切削力之间的非线性数学模型.试验结果表明,切削深度和每齿进给量之间的交互作用对切削力有显著影响,切削力与切削用量间存在非线性特征规律,切削用量对切削力的影响效应随切削用... 相似文献
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为了优化高温合金GH4169插铣加工过程中的切削参数,采用正交试验法进行高温合金GH4169的铣削试验。基于试验法建立了切削力与切削参数之间的经验公式,分析了各切削参数对切削力的影响规律。运用方差分析法检验了经验公式的显著性。结果表明:F_x、F_y、F_z都随着切削速度V_c、每齿进给量f_z、径向切深a_e的增大而增大;三个方向的切削力受径向切深a_e的影响最大,其次是切削速度V_c,每齿进给量f_z的影响最小,且Z方向切削力F_z大于X、Y方向切削力F_x、F_y。 相似文献
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采用单因素试验,分析了切削速度vc、每齿进给量fz和切削深度ap对铣削力的影响规律,结果表明:随着切削速度vc的增大,铣削力减少;随着每齿进给量fz和切削深度ap增大,铣削力增大。同时,设计了4Cr13不锈钢正交试验方案,基于概率统计和回归分析原理,建立了4Cr13不锈钢高速铣削的铣削力模型,对建立的铣削力模型进行了显著性检验,检验结果表明所建立的回归方程呈高度显著检验状态,并对其进行了验证,结果表明该模型与实际情况拟合得较好,故可用其来预测和控制铣削力。 相似文献
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钛合金整体叶盘是航空发动机的重要零部件,结构复杂,加工难度大。插铣加工因其轴向承受能力强和刚性大等特性,非常适合加工钛合金整体叶盘这类难加工、结构复杂的零部件。针对钛合金插铣加工效率的问题,采用响应曲面法设计插铣实验,建立切削力经验模型,以切削力和材料去除率为目标,采用NSGA-II算法进行多目标优化获得Pareto最优解。研究表明:切削力随主轴转速的增加而缓慢减小,随切削宽度、切削步距和每齿进给量的上升而增加;与实验初始参数组合相比,优化后的材料去除率提高了81.19%,而切削力减小了23.68%,达到了本研究的高效加工目标。 相似文献