共查询到19条相似文献,搜索用时 187 毫秒
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为获得切削性能更优良的可转位铣刀片槽型,从而改善铣刀片的力-热耦合综合物理场,进行了铣削温度试验和铣削力试验,以铣削时刀片的装夹状况和试验所获得的数据为边界条件,对带有三维槽型的波形刃铣刀片和平刀片分别进行了力-热耦合物理场有限元分析.基于模糊数学理论,建立了铣刀片耦合场的模糊综合评判模型,对两种铣刀片的力-热耦合物理场进行了模糊综合评判.结果表明,优化铣刀片前刀面的槽型可明显改善切削性能. 相似文献
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薄壁件不一致刀齿铣削时铣削力系数构造与预测 总被引:1,自引:0,他引:1
针对薄壁件铣削过程中刀齿半径不一致现象引起的铣削力系数计算失真问题,提出构造刀齿半径不一致时的实际铣削力系数,并采用核偏最小二乘法对不同铣削用量时的实际铣削力系数进行预测。针对两齿螺旋铣刀铣削过程推导理论铣削力系数,根据刀齿半径不一致铣削过程引入名义铣削力,推导刀齿半径误差,构造实际铣削力系数;基于核分析方法突出的非线性分析及预测能力,提出采用核偏最小二乘法在高维空间建立实际铣削力系数关于铣削用量及其组合量的预测模型,分析该方法中核主元个数、高斯核函数核参数对预测模型精度的影响并确定其取值范围。最后分析考虑刀齿半径误差与不考虑时的铣削力系数,并比较核偏最小二乘预测方法与偏最小二乘预测方法,结果表明所提铣削力系数构造过程及预测方法具有较高的计算精度和预测能力。 相似文献
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Bin Jiang Tiantian He Yunpeng Gu Qilong Wang Guanglei Cao 《The International Journal of Advanced Manufacturing Technology》2017,92(1-4):139-150
Under the influence of a high-speed, interrupted-cutting impact load, a great difference is existed among the internal load propagation of a milling cutter. Furthermore, the cutter damage caused by partial particle severe vibration has restricted the improvement of a high-speed milling energy efficiency; thus, the essence of wave dynamics damage in milling cutter remains has yet to be revealed. In this paper, through the relation between the systematic whole vibration and the particle motion, the dynamic response of milling cutter’s particle to cutting force load can be solved by the particle motion differential equation which is constructed with a one-dimensional string dynamic system. A combination of Newton’s second law and the constitutive equation of milling cutter material establishes the wave dynamics equation of milling cutter components. An approach for solving the wave front position and wave velocity of milling cutter’s stress wave is proposed, and the propagation path of transient cutting force to the milling cutter is communicated. The attenuation model of stress wave reflection is established to provide a method for revealing the stress wave transmission and distribution in milling cutter. The constitutive relation of milling cutter components under the impact load is obtained by split Hopkinson pressure bar experiment. A force connection method is adopted to make the trans-scale correlation analysis between continuum medium mechanics and molecular dynamics, thereby revealing the wave dynamics damage characteristics of a high-speed milling cutter. The results show that the potential damage position and types of milling cutter can be distinguished by the above method. 相似文献
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高速、断续切削载荷作用下的铣刀,其内部不断积聚的能量会引起铣刀原子不可逆运动和宏观结构的改变,高速铣刀安全性具有跨尺度的关联特性。为了提高铣刀安全性,提出一种高速铣刀跨尺度设计方法。采用力连接的方法实现铣刀连续介质力学与分子动力学跨尺度关联,引入熵值法,定量描述铣刀介观安全性。构建铣刀安全性熵值模型,探究铣刀宏介观结构之间的关系,揭示铣刀宏介观安全性对铣刀直径、齿数、齿根结构、刀齿分布、刀片安装前角和铣刀原子群构型参数的响应特性。利用公理设计方法建立高速铣刀安全性跨尺度关联设计模型,并进行铣刀安全性试验验证。分析和试验结果表明,在铣刀高低熵值区内分别发生了属性和程度不同的原子不可逆运动,齿根结构和刀片安装前角对原子群构型具有显著性影响,利用高速铣刀跨尺度设计方法可以提高其安全性,从而为实现高速铣刀高效、可靠、稳定加工提供了保证。 相似文献
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为有效提高球头铣刀的动态性能并优化其结构,运用CATIA构建球头铣刀的三维实体模型,运用ANSYS有限元分析软件对球头铣刀进行静力分析和模态分析,分析结果表明,所建立的铣削力模型可以实现对球头铣刀铣削力和变形量的准确预报,为球头铣刀设计优化提供科学依据. 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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