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《现代制造技术与装备》2018,(11)
立柱是加工中心的核心部件,利用Solidworks软件对某立式加工中心的龙门式立柱进行有限元模型建立,并对模型进行静态受力有限元分析,根据分析结果,对立柱的筋板进行优化设计,达到提高立柱刚性的目的。 相似文献
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以重型单柱立式车铣复合机床立柱为研究对象,通过建立立柱三维模型及有限元模型,对立柱结构进行静态分析,考察立柱变形趋势,通过改变立柱内部筋板结构,对比性能特性,以此提高立柱刚度. 相似文献
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阐述1m铣刨机结构,通过对铣刨机行走驱动系统和铣刨系统受力分析,结合金属切削原理,建立铣刨机的动力学模型,得出铣刨阻力与铣刨材料和行走速度的关系;通过铣刨系统铣刨阻力转换过来的信号自动改变铣刨机的行走速度,以化解铣刨系统的铣刨过载工况,避免铣刨系统和行走系统过载,保护了铣刨系统和行走系统中的各受力元件,提高了施工效率和施工质量。 相似文献
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用改进后的铣削力测量装置进行了不同槽型的铣刀片铣削力试验。基于铣削试验结果,通过机床坐标系与刀体坐标系统的转换,确立了铣刀片应力场有限元分析的载荷边晃条件。利用ANSYS软件,进行了自主研发的三维槽型铣刀片和平刀面铣刀片的应力场有限元分析。有限元分析及试验结果均表明,三维槽型铣刀片的应力场及抗破损能力均好于平前刀面铣刀片。 相似文献
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《现代制造技术与装备》2016,(10)
车铣复合加工中心把车削和铣削加工工艺集成到同一台加工机床,可实现工件的同基准多工序集成加工,有利于提高零件的制造精度。而影响该类机床加工精度的核心零件之一,就是机床的床身。本文针对MJ-520MC/Y数控车铣复合加工中心的斜床身进行高刚性设计分析,探讨建立有利于仿真分析的数字样机的方法;对斜床身数控车铣复合加工中心的受力情况进行分析,将典型工况下的切削力、床身上方各机床零部件的重力折算到床身上,得出斜床身的载荷参数;运用有限元方法对斜床身零件进行静力学分析,得到斜床身静态特性,探讨外部静力载荷对斜床身应力应变的影响;提出了斜床身改进优化的基本思路,为斜床身车铣复合加工中心的结构设计与改进提供技术支持。 相似文献
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多功能车床动力刀塔立柱是决定加工精度的主要部件,为了保证横溜板上留有足够空间安装其它车削刀具,要求立柱在足够的刚度条件下尽可能占据较少的空间.首先介绍了复合车、铣和钻工序的动力刀塔原结构设计;在对刀塔立柱的受力分析和实体造型的基础上进行了有限元分析,完成了刀塔立柱的静刚度分析,提出了一种新结构的刀塔立柱.改进的立柱结构体积进一步减少,有限元仿真结果表明其静刚度得到进一步加强. 相似文献
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为提高加工精度,对立铣刀的应力场进行了有限元分析。通过铣削力试验,对不同切削参数下立铣刀的铣削力进行动态采集,利用UG中的建模模块进行立铣刀实体建模,根据切削力实验结果给出了边界条件,在立铣刀有限元模型上进行加载,利用UG有限元分析模块,获得了立铣刀切削过程中切入、切出的瞬时应力场云图,显示了切削中铣刀片应力场的变化规律。 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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Xue-Hui Shen Jian-Hua Zhang Hua Li Jin-Jun Wang Xiao-Chen Wang 《The International Journal of Advanced Manufacturing Technology》2012,63(1-4):41-49
The objective of this paper is to investigate the effects of assisted ultrasonic vibration in the operation of micro end milling. Based upon numerical analysis for the trajectory of a tool tip of a two-flute end mill, it was found that the assisted feed direction ultrasonic vibration can achieve separate-type milling that is different from conventional operation by reasonable parameter matching. To validate theoretical analysis and investigate the influence of ultrasonic vibration on milling process, a slot-milling experiment was conducted on an aluminum alloy work piece. The desired ultrasonic vibration was applied in the feed direction by an ultrasonic vibrator. Through investigating and comparing some experimental results involving cutting force, chip formation, surface topography, surface roughness, and machining dimensional accuracy, the authors found that micro end milling with ultrasonic vibration in the feed direction leads to a pulse-like cutting force and produces uniform small chips. Assisted ultrasonic vibration in the feed direction has a negative effect on the surface roughness of the slot bottom, but a positive effect on the dimensional accuracy of the slot width. 相似文献
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Saeed Alaei Reza Alaei Payam Salimi 《The International Journal of Advanced Manufacturing Technology》2014,73(1-4):101-111
In the high-speed milling process of large end milling cutter, the stress of cutter caused by centrifugal force accounts for a large proportion of the total stress of the cutter and has a great influence on the milling process. In this paper, an end milling cutter with a diameter of 2,800 mm used on large and high-speed aluminum blank milling machine tools is taken as a research object, and the equations of internal stress caused by centrifugal force have been derived by using analytic method. On this basis, the factors affecting the internal stress were analyzed. Furthermore, the analytic results and the finite element analysis results were compared in order to confirm their correctness. Finally, according to the results of stress analysis, structure topology optimization design for large end milling cutter was carried out in order to reduce the weight and centrifugal force of the cutter. 相似文献
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采用正交试验方法,使用PCBN涂层硬质合金球头铣刀,对不同铣削参数下的52HRC淬硬钢Cr12MoV倾斜表面进行了铣削试验。研究了各工艺参数对切削力的影响规律。试验结果表明:三向力中,Fz远大于Fx和Fy的切削分力,Fz为主铣削力;切削深度对主铣削力的影响大于进给速度、工件倾角和主轴转速对其的影响;工件倾角16.7°,主轴转速6000r/min,进给速度800mm/min,切削深度0.1mm为优选工艺条件。同时,对比试验表明,采用顺铣方式能有效减小切削力,改善铣削稳定性。本文研究结果对淬硬钢Cr12MoV铣削工艺参数的优化具有一定的参考价值。 相似文献
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The axial depth of cut is an important factor in the dynamic cutting force analysis of milling. In multi-path ball end milling, it varies with the cutting edge position angle. General equations are derived from which the instant depth of cut in ball end milling can be calculated. Examples are given for four path increment modes. The cutting condition in each mode is discussed with respect to the depth of cut. The conditions needed to disengage the tip of the ball end mill from the cut are determined. The "step-up" increment mode has the most favorable cutting condition for cutter tip relief and high cutting velocity. In order to obtain an instant evaluation of the cutting stability, the equations of maximum depth of cut in ball end milling are derived. The exact solutions are obtained from the general equations for the instant depth of cut. More conservative estimates are obtained from the simplified solutions. The results in this paper can be used as a guide in NC part programming to select an optimal cutting strategy and to ensure a stable cutting process in ball end milling. 相似文献