共查询到18条相似文献,搜索用时 296 毫秒
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针对钛合金材料的难加工性,基于正交试验,研究了工艺参数对切削力、切削振动等影响规律,提出了综合考虑切削力、切削振动的工艺参数优化方法。研究结果表明,轴向切深、径向切深和进给速度对切削力影响显著,其中轴向切深、径向切深对X方向(垂直加工表面)切削力影响非常显著;切削速度对切削振动影响显著,频谱分析表明试验条件下未发生切削颤振。考虑各工艺参数对切削力、切削振动的显著程度,建立了以切削力、切削振动为约束条件,最大金属切除率为优化目标的工艺参数优化模型,进而获得了不同约束条件下的工艺参数优化组合。 相似文献
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以螺旋铣孔工艺时域解析切削力建模、时域与频域切削过程动力学建模、切削颤振及切削稳定性建模为基础,研究了螺旋铣孔的切削参数工艺规划模型和方法。切削力模型同时考虑了刀具周向进给和轴向进给,沿刀具螺旋进给方向综合了侧刃和底刃的瞬时受力特性;动力学模型中同时包含了主轴自转和螺旋进给两种周期对系统动力学特性的影响,并分别建立了轴向切削稳定域和径向切削稳定域的预测模型,求解了相关工艺条件下的切削稳定域叶瓣图。在切削力和动力学模型基础之上,研究了包括轴向切削深度、径向切削深度、主轴转速、周向进给率、轴向进给率等切削工艺参数的多目标工艺参数规划方法。最后通过试验对所规划的工艺参数进行了验证,试验过程中未出现颤振现象,表面粗糙度、圆度、圆柱度可以达到镗孔工艺的加工精度。 相似文献
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Modelling, simulation and experimental investigation of cutting forces during helical milling operations 总被引:1,自引:1,他引:0
Changyi Liu Gui Wang Matthew S. Dargusch 《The International Journal of Advanced Manufacturing Technology》2012,63(9-12):839-850
The kinematics of helical milling on a three-axis machine tool is first analysed. An analytical model dealing with time domain cutting forces is proposed in this paper. The cutting force model is established in order to accurately predict the cutting forces and torque during helical milling operations as a function of helical feed, spindle velocity, axial and radial cutting depth and milling tool geometry. The forces both on the side cutting edges and on the end cutting edges along the helical feed path are described by considering the tangential and the axial motion of the tool. The dual periodicity which is caused by the spindle rotation, as well as the period of the helical feed of the cutting tool, has been included. Both simulation and experiments have been performed in order to compare the results obtained from modelling with experiments. 相似文献
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Li Xiwen Yang Mingjin Xie Shouyong Yang Shuzi 《Frontiers of Mechanical Engineering in China》2007,2(3):272-277
In the milling process, the major flank wear land area (two-dimensional measurement for the wear) of a small-diameter milling
cutter, as wear standard, can reflect actual changes of the wear land of the cutter. By analyzing the wearing characteristics
of the cutter, a cutting force model based on the major flank wear land area is established. Characteristic parameters such
as pressure parameter and friction parameter are calculated by substituting tested data into their corresponding equations.
The cutting force model for the helical milling cutter is validated by experiments. The computational and experimental results
show that the cutting force model is almost consistent with the actual cutting conditions. Thus, the cutting force model established
in the research can provide a theoretical foundation for monitoring the condition of a milling process that uses a small-diameter
helical milling cutter. 相似文献
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Adrien Cellier Florent Chalon Virginie Grimal-Perrigouas David Bonhoure René Leroy 《Machining Science and Technology》2013,17(4):565-584
□ The influence of the milling process on the fatigue behavior of a titanium alloy was investigated. The effect of cutting conditions such as the cutting angles (axial and radial rake angle) on the surface integrity (roughness and the residual stresses) was observed. The results indicated that the cutting angles have a limited influence on roughness parameters, whereas the effects on residual stresses were greater. A negative axial rake angle induced compressive residual stresses regardless of the radial rake angle. In contrast, a positive axial rake angle combined with negative radial rake angle induced tensile residual stresses. To evaluate the fatigue limit, the four point fatigue tests were carried out. Result showed the fatigue limit is sensitive to the surface integrity. The fatigue limit was also evaluated by analytical method (Arola model). A good correlation was found between the analytical results and the experimental results when cutting angles induced compressive residual stress. However the Arola model was less accurate for tensile residual stress surface condition. To improve the prediction precision, the residual stress was considered as a sensitivity parameter and added to Arola model. 相似文献
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针对数控重型切削加工过程的切削稳定性具有不确定性的特点,提出了在切削稳定性和机床工作能力的约束下,获得最大材料去除率的工艺参数优化方法。根据重型切削加工的工艺特点建立三维动力学模型,以机床的固有频率、阻尼比、刚度和切削力系数作为不确定因素,结合排零定理和边理论对其进行不确定性分析,获得稳健的切削稳定性叶瓣图,结合切削深度、刀具直径和刀具齿数的关系,为加工过程选择能获得最大切削深度的刀具。在此基础上,建立工艺参数优化模型,选择最佳的轴向切削深度、径向切削深度和主轴转速的组合,最后以一台加工中心上某型号发动机缸体表面的粗加工过程为例进行了验证。 相似文献