共查询到20条相似文献,搜索用时 148 毫秒
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建立了描述正交车铣已加工件表面微观形貌的数学模型,并应用MATLAB对表面微观形貌进行了仿真。结果表明,采用不同切削参数加工得到的已加工件微观表面形貌会有很大差别,选择适合的加工参数可在已加工表面得到良好的微储油结构。 相似文献
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在金刚石超精密车削加工中,刀具与工件之间不可避免地存在一定的振动, 从而影响工件表面质量.本文对在具有振动情况下工件表面的三维形貌进行了仿真,并从理论上对工件表面形貌的径向、周向与刀具螺旋轨迹方向的截面轮廓进行了分析,结果表明不同的截面具有不同的信息特征,并据此对仿真得到的工件表面三维形貌数据进行了振动辨识. 相似文献
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砂轮约束磨粒喷射精密光整加工表面微观形貌的研究 总被引:5,自引:1,他引:5
对砂轮约束磨粒喷射精密光整加工表面微观形貌进行分析,研究了工件表面尖峰去除机理和均化及改善波纹度机理。利用平面磨床M7120对精磨后的Q235A工件材料进行喷射加工实验,采用TALSURF5轮廓仪测量加工后表面的微观几何参数值,用扫描电镜观察表面微观形貌变化,用金相显微镜观察磨削烧伤。实验结果表明,随着加工循环次数的增加,表面微观形貌由方向一致的沟槽过渡到随机的、无方向性的微细凹坑,表面粗糙度值明显降低,喷射加工能减轻或消除磨削烧伤。 相似文献
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Vedat Savas Cetin Ozay 《The International Journal of Advanced Manufacturing Technology》2008,37(3-4):335-340
Turn-milling is a relatively new process in manufacturing technology, where both the workpiece and the tool are given a rotary
movement simultaneously. This paper presents an approach for optimization of cutting parameters at cylindrical workpieces
leading to minimum surface roughness by using genetic algorithm in the tangential turn-milling process. During testing, the
effects of the cutting parameters on the surface roughness were investigated. Additionally, by using genetic algorithms for
each of the cutting parameters (depth of cut, workpiece speed, tool speed and feed rate) minimum surface roughness for the
process of tangential turn-milling was determined according to the cutting parameters. 相似文献
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Lida Zhu Haonan Li Wansan Wang 《The International Journal of Advanced Manufacturing Technology》2013,69(9-12):2279-2292
As a new technology in manufacturing, turn-milling broadens the application ranges of mechanical processing, wherein both cutting tool and workpiece are given a rotary motion simultaneously. The objective of the present work is to study workpiece surface topography during orthogonal turn-milling process. This study begins with two mathematical models, which describe theoretical surface roughness and topography of rotationally symmetrical workpiece. The models are built with the establishment of locus function according to orthogonal turn-milling principle. Then based on these models, the influence law of surface topography affected by various cutting parameters is found by some simulation methods. The law also matches with orthogonal turn-milling surface roughness and topography experiments. By analyzing the experimental results, some parameter selection criteria during orthogonal turn-milling processing are also proposed qualitatively and quantitatively. The comparison between the simulation and experimental results shows that a better surface quality and tiny oil storage structure can be obtained if the cutting parameters are chosen in reason. This conclusion provides a theoretical foundation and reference for the orthogonal turn-milling mechanism research. 相似文献
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薄壁铸铝合金高速铣削加工试验研究 总被引:1,自引:0,他引:1
以铸铝合金薄壁件为加工对象,分别研究不同的切削速度、每齿进给量、径向切深对表面质量和切削力的影响规律,并优化切削参数的选择,力求为合理选择高速切削加工参数提供可靠依据。 相似文献
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点磨削属于外圆磨削技术的一种,其砂轮与工件轴线之间存在变量夹角α,加工过程中磨粒的运动轨迹发生改变。为探索α对工件表面粗糙度的影响,利用砂轮与工件之间的运动关系及坐标转化,将磨粒运动函数等效为抛物线,得出点磨削的切削路径。基于砂轮表面磨粒分布状态,沿砂轮轴向扩展有效干涉痕迹,得到工件的三维几何仿真形貌。将45钢淬火后作为工件材料,选择典型磨削参数,利用试验对模型进行验证。结果表明:仿真与实际工件微观形貌呈现相似特征,两形貌表面高度概率密度分布十分吻合,在不同磨削速度下,两结果之间平均相差7.8%。当α在0°~4°变化时,Ra的浮动范围小于0.1μm,工件表面粗糙度不会发生明显改变,几何仿真模型为实际磨削工件形貌分析提供了一种辅助和验证方法。 相似文献
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Tool fabrication system for micro/nano milling—function analysis and design of a six-axis Wire EDM machine 总被引:1,自引:1,他引:0
X. Cheng Z. G. Wang S. Kobayashi K. Nakamoto K. Yamazaki 《The International Journal of Advanced Manufacturing Technology》2010,46(1-4):179-189
The dies or molds used for the fabrication of micro products usually are made of ultra-hard materials such as tungsten carbide or silicon carbide and have sophisticated three-dimensional geometries. Such kind of dies or molds can only be fabricated by milling operations instead of grinding processes with ultra-hard milling tools made of PCD or CBN. Electrical discharge machining (EDM) is a good choice for the fabrication of such ultra-hard tools. In this paper, a function analysis and design of a six-axis Wire EDM (WEDM) machine is introduced. Based on the typical micro/nano cutting tool geometry features, a mathematical model between the cutting tool and the electrode wire is built. Then, the mathematical model is analyzed and it turns out that six axes are needed for cutting such complicated tool geometries. According to the WEDM features, first the axes are allocated to the workpiece side and the electrode wire side. The workpiece is assigned three linear motions and one rotary motion around its center line and the wire has two rotary motions. Second, the axis sequences are defined. At last, the best concept of the mechanical structure for the six-axis WEDM machine is selected. 相似文献
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Influence of size effect on burr formation in micro cutting 总被引:3,自引:1,他引:2
Tao Zhang Zhanqiang Liu Chonghai Xu 《The International Journal of Advanced Manufacturing Technology》2013,68(9-12):1911-1917
Burr is an important character of the surface quality for machined parts, and it is even more severe in micro cutting. Due to the uncut chip thickness and the cutting edge radius at the same range in micro cutting process, the tool extrudes the workpiece with negative rake angle. The workpiece flows along the direction of minimum resistance, and Poisson burr is formed. Based on the deformation analysis and experiment observations of micro cutting process, the factor for Poisson burr formation is analyzed. It is demonstrated that the ratio of the uncut chip thickness to the cutting edge radius plays an important role on the height of Poisson burr. Increasing the uncut chip thickness or decreasing the cutting edge radius makes the height of exit burr reduce. A new model of micro exit burr is established in this paper. Due to the size effect of specific cutting energy, the exit burr height increases. The minimum exit burr height will be obtained when the ratio of uncut the chip thickness to the cutting edge radius reaches 1. It is found that the curled radius of the exit burr plays an important role on the burr height. 相似文献
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Zhenjing Duan Changhe Li Wenfeng Ding Yanbin Zhang Min Yang Teng Gao Huajun Cao Xuefeng Xu Dazhong Wang Cong Mao Hao Nan Li Gupta Munish Kumar Zafar Said Sujan Debnath Muhammad Jamil Hafiz Muhammad Ali 《机械工程学报(英文版)》2021,34(1):54-88
Aluminum alloy is the main structural material of aircraft,launch vehicle,spaceship,and space station and is pro-cessed by milling.However,tool wear and vibration are the bottlenecks in the milling process of aviation aluminum alloy.The machining accuracy and surface quality of aluminum alloy milling depend on the cutting parameters,material mechanical properties,machine tools,and other parameters.In particular,milling force is the crucial factor to determine material removal and workpiece surface integrity.However,establishing the prediction model of milling force is important and difficult because milling force is the result of multiparameter coupling of process system.The research progress of cutting force model is reviewed from three modeling methods:empirical model,finite element simulation,and instantaneous milling force model.The problems of cutting force modeling are also determined.In view of these problems,the future work direction is proposed in the following four aspects:(1)high-speed milling is adopted for the thin-walled structure of large aviation with large cutting depth,which easily produces high residual stress.The residual stress should be analyzed under this particular condition.(2)Multiple factors(e.g.,eccentric swing milling parameters,lubrication conditions,tools,tool and workpiece deformation,and size effect)should be consid-ered comprehensively when modeling instantaneous milling forces,especially for micro milling and complex surface machining.(3)The database of milling force model,including the corresponding workpiece materials,working condi-tion,cutting tools(geometric figures and coatings),and other parameters,should be established.(4)The effect of chatter on the prediction accuracy of milling force cannot be ignored in thin-walled workpiece milling.(5)The cutting force of aviation aluminum alloy milling under the condition of minimum quantity lubrication(mql)and nanofluid mql should be predicted. 相似文献