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为减少细长轴的车削加工误差,论文对某细长轴的精加工车削和粗加工车削过程进行了分析,结合实际加工情况运用有限差分法和有限元法(不考虑加工机床主轴组件和尾座的刚性和考虑加工机床的刚性)分别求出精加工车削和粗加工车削过程细长轴外轮廓变形和径向切削力的变化,为细长轴的自动加工控制、减少加工误差提供各种数据,从而提高细长轴的加工质量。 相似文献
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车削中心包括了数控车床的功能通过动力头同时具备的铣削功能。运用Mastercam软件进行螺杆的编程、仿真加工、后处理,采用EMCO MAXXTURN65车削中心完成数控加工。实际加工证明采用车削中心加工的S杆效率、精度都得到了提高。 相似文献
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针对滚珠丝杆副的关键结构内螺旋滚道难加工、加工成本高等问题,提出了一种拟合车削的新型加工工艺,并构建了一个经济型的内螺旋滚道加工系统.通过拟合车削算法生成拟合车削点,圆弧形车刀以拟合车削点为基点进行层层拟合车削,从而完成内螺旋滚道的加工.经加工试验,该系统的加工精度为0.001mm,经该系统加工的内螺旋滚道的表面粗糙度可达Ra0.8,证明该加工工艺的可行性并具有较大的应用价值. 相似文献
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为实现微细车削自动化加工,基于LabVIEW开发微细车削加工控制系统。该系统使用模块化设计,包括初始化模块、定位对刀模块、G代码加工模块和实时坐标显示模块,通过计算两轴的速度比例并赋予相应值实现斜线插补,通过逐点比较法实现圆弧插补。为提高微细车削编程效率,基于Python开发微细车削G代码自动生成系统,该系统包括参数设置模块、切削设置模块和G代码生成模块。利用G代码自动生成系统获取G代码,然后将生成的G代码导入到微细车削加工控制系统,对直径3 mm的铝合金棒料进行了微细车削加工实验,成功加工出微细阶梯轴、圆珠笔头以及微细螺纹。 相似文献
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针对特殊圆弧螺纹加工困难的问题,分析了特殊圆弧螺纹车削加工的技术难点,提出了开发数控车削特殊圆弧螺纹通用宏程序的新思路,并编制出具有较高实用价值的特殊圆弧螺纹数控车削通用宏程序,实现了特殊圆弧螺纹数控车削的快速加工。 相似文献
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为了提高同心不等径非圆截面零件加工的质量和效率,对实现该类零件加工的方法进行了研究,提出了一种快速高精度加工同心不等径非圆截面的数控车削方法。设计了数控车削系统的结构,快速刀具进给伺服机构(FTS)采用基于自抗扰控制的直线电机系统。数控系统采用PMAC(Pro-grammable multi-axis controller)多轴运动控制器的时基控制法,实现刀具驱动进给和工件旋转的协调控制,完成该型零件的自动车削。结果表明该型零件的加工精度和加工效率得到了提高。 相似文献
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L. Carrino G. Giorleo W. Polini U. Prisco 《International Journal of Machine Tools and Manufacture》2002,42(14)
During the machining of a part, a new surface is generated together with its dimensional deviations. These deviations are due to the presence of several phenomena (workpiece deflection under strong cutting forces, vibration of the machine tool, material spring-back, and so on) that occur during machining. Each elementary phenomenon results in an elementary machining error. Consequently, the accuracy of the manufactured workpiece depends on the precision of the manufacturing process, which it may be controlled or predicted.The first part of this work presents a new model to evaluate machining accuracy and part dimensional errors in bar turning. A model to simulate workpiece dimensional errors in longitudinal turning due to deflection of the tool, workpiece holder and workpiece is shown. The proposed model calculates the real cutting force according to the Unified Generalized Mechanics of Cutting approach proposed by Armarego, which allows one to take into account the three-dimensional nature (3D) of the cutting mechanism. Therefore, the model developed takes advantage of the real workpiece deflection, which does not lie in a plane parallel to the tool reference plane, and of the real 3D cutting force, which varies along the tool path due to change in the real depth of cut. In the first part of the work the general theory of the proposed approach is presented and discussed for 3D features. In the second part the proposed approach is applied to real cases that are mostly used in practice. Moreover, some experimental tests are carried out in order to validate the developed model: good agreement between numerical and experimental results is found. 相似文献
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分析了硬质合金凸模切断部分修整的工艺处理及复杂凹模板小拐角修整的加工工艺处理 ,针对多孔模板加工过程中微量变形与工艺处理进行了综合比较及分析 相似文献
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Investigations of White Layer Formation During Machining of Powder Metallurgical Ni-Based ME 16 Superalloy 总被引:2,自引:0,他引:2
S. C. Veldhuis G. K. Dosbaeva A. Elfizy G. S. Fox-Rabinovich T. Wagg 《Journal of Materials Engineering and Performance》2010,19(7):1031-1036
Surface integrity of machined parts made from the advanced Ni-based superalloys is important for modern manufacturing in the
aerospace industry. Metallographic observations of the ME 16 alloy microstructure were made using optical metallography and
a high-resolution scanning electron microscope with energy dispersive x-ray spectrometer (HR SEM/EDS). Tool life of cemented
carbide inserts with TiAlN coating during machining (finishing turning operation) of ME 16 superalloy has been studied and
wear patterns of the cutting tools were identified. Surface integrity of the machined part after completion of the turning
operation was investigated. The morphology of machined parts has been examined and cross-sections of the machined surfaces
have been analyzed. The formation of white layer on the surface of the machined part was studied for varied machining conditions.
It was found that a 2-4 μm thick white layer forms during turning of the ME 16 superalloy. This layer was investigated using
EDS and XRD. The studies show that the white layer is an oxygen-containing layer with a high amount of aluminum, enriched
by chromium and tungsten. Under specific cutting conditions, the structure of white layer transforms into a γ-alumina. Formation
of this thermal barrier ceramic white layer on the surface of the machined part negatively affects its surface integrity and
cutting tool life. 相似文献
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分析簿壁壳体零件特点和加工难点。设计车加工夹具,解决车加工变形问题;设计钻孔夹具,利用夹具精度,保证零件加工精度。通过设计工装夹具,解决了簿壁零件变形问题。 相似文献
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Ki Young Song Do Kwan Chung Min Soo Park Chong Nam Chu 《Journal of Materials Processing Technology》2013,213(9):1495-1500
Turning by electrical discharge machining (EDM turning) is an effective method to machine hard-to-cut materials. Generally, a wire-EDM is utilized in EDM turning because it is not concerned with electrode wear. However, wire-EDM turning has a slow machining speed due to its small machining area, and the wire may break due to overheating electrodes. For these reasons, its machining speed must be limited. In this study, a strip-EDM was created in an effort to overcome the problems in the EDM-turning process. This machining method used a conductive strip as an electrode. The strip was fed continuously, like a wire-EDM; therefore electrode wear was not a concern. One advantage of the strip-EDM was that it increased the material removal rate because of its large machining area and non-breaking electrode. In the experiments, machining characteristics were investigated according to machining conditions, and practical machining was carried out via fabrication of complex shapes on a shaft workpiece. 相似文献
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在实际加工约束条件下,建立以表面粗糙度和能量消耗为目标的多工序车削优化模型的切削参数优化选择十分必要。运用NSGA-II算法和MOPSO算法对多工序车削模型进行优化比较。优化实例表明:NSGA-II算法能够获得了比MOPSO算法更优的表面粗糙度、能量消耗的Pareto最优解集以及相应的粗、精切削参数,为多工序车削参数优化选择提供了依据。 相似文献