共查询到18条相似文献,搜索用时 653 毫秒
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双摆角铣头是高档数控机床的关键功能部件之一。双摆角铣头结构是实现大型数控龙门镗铣床及加工中心五轴联动的主要形式。首先介绍了通过实验方法计算切削力的过程,在摆角范围给定的条件下,通过理论推导和计算给出了某种结构A/B双摆角铣头摆角切削力矩的计算公式,最后通过特殊位置和任意位置进一步验证了公式的正确性。摆角切削力矩是摆角驱动力矩的重要组成部分,此计算公式的研究对摆角铣头的结构设计具有重要的指导意义。 相似文献
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针对A/C轴双摆角铣头的结构特点,研究了A轴自动交换过程中的A轴自动交换原理、对接元件的对接过程、对接元件的过定位问题以及A轴与铣头库的定位问题。通过对样机试制与实验验证,充分证明了该技术的合理性。 相似文献
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基于普通龙门加工中心基础上而设计的A/C轴双摆角机械传动铣头,可以针对不同型号的数控龙门铣床进行量身定做;可以为企业利用现有龙门加工中心进行升级改造实现五轴联动加工的愿望;也可以为机床制造工厂设计A/C轴双摆角铣头提供参考. 相似文献
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为了改善传统铣削钛合金的加工条件,研究了进给方向超声振动辅助铣削对切削力的影响。定值计算了不同振动频率、振幅、铣削速度时的净切削时间比,建立了对工件施加超声振动的铣削加工三维有限元模型,根据仿真结果讨论了加工参数对进给方向切削力瞬时值的影响,并结合净切削时间比分析了加工参数对三个方向切削力平均值的影响。研究表明:施加超声振动后切削力明显减小;振动频率小于40kHz和振幅小于30μm时切削力平均值同净切削时间比变化趋势一致,当频率或振幅超过上述值时,刀具、工件间的摩擦力对切削力平均值的影响显著。 相似文献
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以加工方钻杆专用机床的铣头为研究对象,设计并分析其机械结构是否满足加工工件的需要。具体介绍铣头设计过程及结构布置形式,同时对其铣头结构进行有限元分析,建立铣头结构三维模型。对其模态分析后,得出了其铣头箱体的前六阶固有频率和振型,与铣头切削时的振动频率进行比较。分析结果为评定方钻杆机床的动态特性提供了依据,并且为具有与其相似结构的铣头提供了理论基础。 相似文献
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应用有限元分析计算的方法,在产品设计阶段对铣头主轴系统进行模态和频率响应分析.以校核主轴设计的动态性能。通过制造后的实验测试,证明有限元分析方法中,合理的建模和计算参数的设定,对设计方案的动力学特性评估有较好的准确性。 相似文献
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The material removal rate and required workpiece surface quality of thin-walled structure milling are greatly limited due to its severe vibration, which is directly associated with the dynamic characteristics of the system. Therefore, the suppression of vibration is an unavoidable problem during milling. A novel partial surface damping method is proposed to modify the mode of the thin walled cantilever plate and to suppress vibration during milling. Based on classical plate theory, the design criterion is analyzed and configuration of the partial surface damper is introduced, in which viscoelastic plate and constraining plate are attached to the surface of the plate to increase the system’s natural frequency and loss factor. In order to obtain the energy expression of the cutting system, the Ritz method is used to describe the unknown displacements. Then, with Lagrange’s equation, the natural frequency and loss factor are calculated. In addition, the plate is divided into a finite number of square elements, and the regulation of treated position is studied based on theoretic and experimental analysis. The milling tests are conducted to verify its damping performance and the experimental results show that with treatment of partial surface damper, the deformation of the bare plate is reduced from 0.27 mm to 0.1 mm, while the vibration amplitude of the bare plate is reduced from 0.08 mm to 0.01 mm. The proposed research provides the instruction to design partial surface damper. 相似文献
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YANG Qingdong LIU Guoqing WANG Keshe 《机械工程学报(英文版)》2008,21(6):103-107
The milling-head machine tool is a sophisticated and high-quality machine tool of which the spindle system is made up of special multi-element structure. Two special mechanical configurations make the cutting performance of the machine tool decline. One is the milling head spindle supported on two sets of complex bearings. The mechanical dynamic rigidity of milling head structure is researched on designed digital prototype with finite element analysis(FEA) and modal synthesis analysis ( MSA ) for identifying the weak structures. The other is the ram structure hanging on milling head. The structure is researched to get dynamic performance on cutting at different ram extending positions. The analysis results on spindle and ram are used to improve the mechanical configurations and structure in design. The machine tool is built up with modified structure and gets better dynamic rigidity than it was before. 相似文献