新一代数控车床样机切削力测试试验研究

设计了切削力测试试验,对数控车床切削45钢切削用量对切削力的影响进行了试验研究,重点分析了切削用量对主切削力的影响规律。设计了切削用量对切削力影响单因素试验和正交试验,并对试验结果进行了分析,根据正交试验结果对主切削力经验公式进行了拟合,结果表明:切深和进给速度对切削力的影响显著,切削速度对切削力的影响不显著,该经验公式具有较高的预测精度。     

切削参数对34CrNiMo6高强度钢切削力影响的仿真研究

通过仿真研究高强度钢的切削力,建立高强度钢切削力的仿真模型。在AdvantEdge有限元仿真软件的基础上,运用正交试验方案分析切削用量对主切削力、进给抗力的影响规律,获得了该研究范围内切削用量的最优方案,建立了经验公式。结果表明,切削力仿真模型精度较好,切削深度对高强度钢切削力影响最大,主切削力和进给抗力均随切削速度的增大而减小,且主切削力Fc约为进给抗力Ff的两倍。     

难加工材料高速切削过程中切削力的非线性特征规律析因研究

综合应用析因试验设计与拉丁超立方抽样试验设计,对难加工材料马氏体不锈钢进行了高速铣削试验。在分析其切削力的非线性特征规律基础上,建立了高速切削难加工材料工艺中切削力与背吃刀量、每齿进给量和切削速度之间的非线性数学模型。试验结果表明,高速切削难加工材料时,背吃刀量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确实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量的变化而发生改变。     

PCBN刀具超声振动车削45淬火钢的切削力与温度研究

应用正交试验设计，通过PCBN刀具对45淬火钢进行的普通硬车削与超声振动硬车削的对比试验，研究切削用量在两种切削方式下对切削力和切削温度的影响规律。试验结果表明：在合理的切削速度下，采用小进给量和小切削深度时，超声振动硬车削的切削力和切削温度要比相应的普通硬车削小得多。     

数控车削加工切削力的预测研究

应用六西格玛原理对数控车削加工钛合金材料进行正交切削试验,通过采集三向切削力信号,对数据结果进行分析,找出在正交试验范围内切削用量对切削力的影响规律,并通过对数据进行因子刻画,提出了一种在缺乏切削力经验公式和检测条件下进行切削力预测的有效方法,为优化切削加工条件提供了重要依据。     

硬质合金刀具高速切削高强度钢切削力非线性规律研究

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...     

TA15钛合金切削振动与表面质量关系研究

通过单因素试验对TA15进行外圆车削加工,采集振动信号并提取信号特征值,分析了切削用量对切削振动和表面粗糙度的影响规律,揭示切削用量对振动的影响,并根据正交试验结果分析切削用量对振动和表面粗糙度影响的主次关系,得到优化的切削用量。试验研究表明:切削用量中,切深对切削振动影响最大,其次为进给量,切削速度影响最小。改变进给量时,振动加速度与表面粗糙度近似成线性正比关系;改变切深时,振动加速度随表面粗糙度的增加而增加。     

细长轴振动车削表面粗糙度的研究

根据超声波振动车削加工原理,第一步通过逐点单因素试验对超声振动切削下细长轴不同位置处表面粗糙度随切削用量的变化进行了研究,确定了不同切削因素变化下细长轴表面粗糙度的极值位置;第二步通过正交试验研究了超声振动车削细长轴时切削用量对工件整体平均表面粗糙度的影响,并与普通切削进行了对比试验。试验结果表明:超声波振动车削能够显著改善细长轴加工后的表面粗糙度。同时研究了各切削用量对表面粗糙度的影响规律,并对超声振动切削参数进行优化,得出试验最佳切削参数。     

钻削碳纤维复合材料切削温度的仿真研究

为研究切削参数对钻削碳纤维增强复合材料的切削温度影响规律，基于ABAQUS有限元分析软件建立了T300碳纤维复合材料的钻削仿真模型，对钻削加工中切削温度的分布和特点进行了研究。基于正交试验法在不同切削参数下进行钻削仿真试验得到其切削温度，采用单因素试验法进行钻削加工仿真，得到钻削碳纤维增强复合材料时不同切削参数对钻孔切削温度的影响规律。结果表明：钻头切削刃刀尖处的温度远高于钻头边缘处的温度，钻头后刀面的切削温度高于钻头前刀面的切削温度。对切削温度影响最大的钻削参数为钻头直径，切削速度和进给量的影响次之；切削用量组合为钻头直径4mm、切削速度40m/min和进给量0.08mm/r时，切削温度最低；切削温度与钻头直径和切削速度呈正相关，切削温度与进给量呈负相关。     

基于机器人的高速切削系统的切削工艺参数研究

压铸件产品的飞边一直是影响压铸件产品质量的一个重要因素,为实现压铸件飞边的自动化去除,设计了一套基于机器人的高速切削系统。利用机器人进行高速切削,并对高速切削工艺参数进行研究。采用单因素试验法对铝铸件进行了铣削试验,分析了在工件坐标系中三方向分力随着切削用量的变换规律。其结果可为基于机器人的高速切削系统的设计提供一定的参考,也可为基于机器人的高速切削系统在实际切削时的切削用量选用提供借鉴。     

Modeling and optimization of burr height in drilling of Al-7075 using Taguchi method and response surface methodology

This investigation presents the use of Taguchi and response surface methodologies for minimizing the burr height and the surface roughness in drilling Al-7075. The Taguchi method, a powerful tool to design optimization for quality, is used to find optimal cutting parameters. Response surface methodology is useful for modeling and analyzing engineering problems. The purpose of this paper was to investigate the influence of cutting parameters, such as cutting speed and feed rate, and point angle on burr height and surface roughness produced when drilling Al-7075. A plan of experiments, based on L₂₇ Taguchi design method, was performed drilling with cutting parameters in Al-7075. All tests were run without coolant at cutting speeds of 4, 12, and 20 m/min and feed rates of 0.1, 0.2, and 0.3 mm/rev and point angle of 90^°, 118°, and 135°. The orthogonal array, signal-to-noise ratio, and analysis of variance (ANOVA) were employed to investigate the optimal drilling parameters of Al-7075. From the analysis of means and ANOVA, the optimal combination levels and the significant drilling parameters on burr height and surface roughness were obtained. The optimization results showed that the combination of low cutting speed, low feed rate, and high point angle is necessary to minimize burr height. The best results of the surface roughness were obtained at lower cutting speed and feed rates while at higher point angle. The predicted values and measured values are quite close to each other; therefore, this result indicates that the developed models can be effectively used to predict the burr height and the surface roughness on drilling of Al-7075.     

Measurement and analysis of thrust force in drilling of particle board (PB) composite panels

Particleboard is a wood based composite extensively used in wood working. Drilling is the most commonly used machining process in furniture industries. The surface characteristics and the damage free drilling are significantly influenced by the machining parameters. The thrust force developed during drilling play a major role in gaining the surface quality and minimizing the delamination tendency. The objective of this study is to measure and analyze the cutting conditions which influences the thrust force in drilling of particle board panels. The parameters considered are spindle speed, feed rate and point angle. The drilling experiments are performed based on Taguchi’s design of experiments and a response surface methodology (RSM) based mathematical model is developed to predict the influence of cutting parameters on thrust force. The results showed that high spindle speed with low feed rate combination minimizes the thrust force in drilling of pre-laminated particle board (PB) panels.     

基于离散元的模拟月岩切削负载特性数值模拟及试验验证

钻取采样是人类获取月球岩石类样品的重要手段,钻进负载的稳定性是确保月岩采样任务成功的关键因素。由于岩石属性直接决定其可钻性等级,并影响钻进负载,有必要在地面环境中,分析岩石本构模型与钻进负载之间的关系,构建不同可钻性等级的岩石样本模型,开展模拟钻进试验,获知不同钻进参数下岩石采样的钻进载荷变化情况。据此,将地面条件下大理岩样本选作模拟月岩切削特性的研究对象,基于二维颗粒流程序(Particle flow code 2 dimensions,PFC2D),建立小切削深度下仿真分析模型。利用Plackett-Burman试验(PB试验)和中心组合设计(Central composite design,CCD)方法,确定影响岩石切削特性的微观参数,开展不同切削深度下的模拟月岩切削负载试验验证。经仿真分析与试验验证能得到与岩石切削特性相对应的离散元模型,试验结果表明该仿真模型在较小切削深度条件下的切削负载变化规律与实际情况一致。通过研究获得了一种建立模拟月岩离散元切削模型的建模方法,为后续分析钻头/切削刃构型参数对钻进/切削负载的影响提供了研究条件。     

振动钻削中轴向平均切削力的理论研究

振动钻削特殊的切削机理能显著降低钻削过程中的切削力。通过分析振动钻削过程中的钻头运动,推导了钻头在切削过程中所受轴向平均切削力的理论计算公式,并据此对振动钻削过程中切削参数和振动参数对轴向平均切削力的影响进行了定性分析。     

基于ABAQUS的小孔钻削加工仿真

研究了小孔径深孔钻削加工过程中切削参数对零件变形及残余应力的影响,旨在获得不同切削参数下切削力和残余应力的变化规律。对钻削加工工艺分析的基础上,利用 ABAQUS有限元仿真软件,选择合适的材料模型和失效准则,设定多组切削参数,建立零件的三维钻削模型进行仿真。结果表明,根据仿真结果可优选合适的切削参数,并预测切削力,这为钻削的实际生产提供更直接的理论依据。     

Optimization of cutting parameters on drill bit temperature in drilling by Taguchi method

In this study, the optimization of the cutting parameters on drill bit temperature in drilling was performed. Al 7075 work piece and the uncoated and Firex® coated carbide drills in the experimental were used. The optimization of the cutting parameters was evaluated by Taguchi method. The control factors were considered as the cutting speed, feed rate and cutting tool. Taguchi method was used to determining the settings of cutting parameters. The L₁₈ orthogonal array was used in experimental planning. The most significant control factors affected on drill bit temperature measurements was obtained by using analysis of variance (ANOVA). Taguchi design method exhibit a good performance in the optimization of cutting parameters on drill bit temperature measurements. In addition, the empirical equations of drill bit temperatures were derived by using regression analysis. The obtained equations results compared with the drill bit temperature measurement results. The empirical equations results indicated a good agreement with experimental results.     

Effect of the cutting ratio on cutting forces and the drill life in vibration drilling

In this paper, by analysing the axial cutting thickness and the cutting graphics, a new concept of cutting ratio K in vibration drilling is introduced for the first time. Cutting ratio K can show the proportion of cutting time in a cutting cycle and describe the working condition of the drilling during the vibration drilling. The relationship between cutting parameters and vibration parameters are denoted as two parameters, ω_f and E. By computer program, the relationships between K and ω_f is found; their characteristic are periodicity, symmetry and having many peak values. The curves, which describe the relation between K and E, are digressive. The regularity can be used to optimise the parameters in vibration drilling to achieve good machine performance. The experiment results indicate that the thrust, torque and the drill life are related to cutting ratio K.     

微小孔振动钻削力的实验研究

介绍了高灵敏度的微小孔钻削测力仪的结构设计及微小孔钻削力测量系统的工作原理。通过多元正交多项式回归实验 ,得到了微小孔振动钻削力关于振动频率、振幅和进给量的非线性回归方程 ,进而分析了振动参数和切削参数对钻削力的影响 ,为深入研究微小孔振动钻削机理提供了必要的实验手段和有价值的研究方法     

外排屑深孔板钻的设计与应用

详细介绍了轴类零件卧车加工中心深孔用外排屑板钻的结构形式和特点、设计参数和要求,同时介绍了板钻实际使用的切削用量。     

螺旋钻采煤机钻头截齿载荷特性研究

为了研究螺旋钻采煤机钻头上镐型截齿的载荷特性,进而为钻头的设计提供参考依据,采用非线性动力学仿真软件LS-DYNA建立了单齿钻进截割煤岩的有限元模型,利用该模型研究了钻进工况下截齿的受力特点和截齿载荷特性随安装参数的变化规律。研究表明：钻头上截齿的截割工况为半封闭式切削,截齿会承受极大的进给阻力;截齿截割阻力随截割角的增大以二次函数形式减小,随倾斜角的增大以指数函数形式呈现先稳定后急剧增大的趋势;截齿进给阻力与截割角成指数函数关系,与倾斜角成线性关系,随截割角和倾斜角的增大而减小;在避免齿体与煤体干涉条件下,截齿宜选用较大的截割角度;为使钻头截齿拥有良好的截割性能和钻进性能,截齿倾斜角不宜超过30°。 