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当今,在数控机床中出现了两种直线驱动机构,即:"旋转电机十滚珠丝杠副"进给传动方式和直线电机直接驱动方式. 相似文献
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针对高速滚珠丝杠副性能指标的测量需求,设计了一套基于直线电机的高速滚珠丝杠副寿命测试试验系统,系统以直线电机为加载机构、旋转伺服电机为丝杠驱动机构、多轴运动控制卡为运动控制器。据此系统设计的滚珠丝杠副高速加载跑合寿命试验机在连续稳定变负载的情况下,可以对滚珠丝杠在高速、高加速度、大负荷等条件下进行长时间运行测试,满足寿命试验机对滚珠丝杠副寿命试验和相关参数的测试要求。试验结果证明了系统的可行性。 相似文献
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当今,在数控机床中出现了两种直线驱动机构,即:“旋转电机 滚珠丝杠副”进给传动方式和直线电机直接驱动方式。目前绝大多数精密机床及新研制的机床均采用“旋转电机 滚珠丝杠副”作为直线驱动机构,而世界上一些发达国家的知名机床厂家,则推出了新型的直线电机直接驱动装置,如德国的DMG公司,日本的 相似文献
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针对普通立式车床的不足之处,在保留右刀架机械结构和操作功能不变的基础上对C5225立式车床的左刀架进给系统进行了数控化改造。左刀架采用滚珠丝杠、伺服电机和一级齿轮减速,并利用SINUMERIK 802D数控系统的半闭环控制实现左刀架的X轴和Z轴联动控制,机床改造后,扩大了加工范围,提高了生产效率和加工精度。 相似文献
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《现代制造技术与装备》2016,(8)
对数控立式加工中心的X向进给系统的主要部分进行设计,并做出说明。主要内容包括X向进给系统设计的整体方案、滚珠丝杠的选择、滚珠丝杠支撑的选择、进给伺服电机的选择等。其中,重点介绍滚珠丝杠和伺服电机的选择,介绍如何在已知机床设计目标参数的条件下,结合机床实际使用情况和丝杠及电机厂家的产品资料。 相似文献
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一、改装的主要内容 1.机械部分保留原X52K立式铣床的传动部分,取消原工作台垂直、纵向、横向移动机构,采用滚珠丝杠副和大贯量直流伺服电机FB15—5型作驱动,工作台、工作台底座、升降台亦用原有零件,而滑动副采用铸铁与聚四氟乙烯塑料导轨副,为其减少滑动摩擦系数,保证机床运动件重复定位精度和微量进给时无爬行。从图1可知,伺服电机1上装有斜齿轮2,电机旋转时斜齿轮2带动斜齿轮3、4,由于斜齿轮3与滚珠丝杠6连接在一起,滚珠丝杠作旋转运动,而滚 相似文献
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建立了滚珠丝杠进给系统仿真参数的同时建立了伺服闭环控制模型,并在此基础上对加工中直线切削和圆周运动存在的各种偏差进行了仿真分析,提出了在高速加工中有效减小滚珠丝杠进给系统弹性变形的措施。 相似文献
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介绍了DK9032熔爆机床伺服进给机构及其滚珠丝杠副、伺服电机、丝杠轴承的选择计算,并对伺服进给系统的综合刚度和传动精度进行了验算。 相似文献
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凸轮数控车削系统关键技术的研究 总被引:7,自引:0,他引:7
研究了基于数控车削加工凸轮的方法,并对数控车削凸轮的关键技术进行研究,提出了有效的方法,为凸轮的高效率加工提供了一个新的途径。一般在凸轮数控车削加工过程中,切削角与切削速度随加工凸轮轮廓位置不同会发生很大变化,为了实现切削角随凸轮轮廓位置实时变化,采用了高频响直线伺服电动机驱动刀具高频摆动的方法,实现刀具的位置实时控制。凸轮的轮廓是一个非圆截面,为了生成凸轮非圆截面,采用高频响直线伺服电动机驱动刀具往复高速运动,实现凸轮非圆截面的生成。车削凸轮时,切削速度一般需要保持恒定,这样有利于刀具的寿命延长,并保证凸轮表面的粗糙度,为了实现凸轮车削的恒定线速度,采用变主轴转速的车削方法,解决这个重要的切削工艺问题。 相似文献
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Electronic cam motion generation with special reference to constrained velocity, acceleration, and jerk 总被引:1,自引:0,他引:1
Electronic cam motion involves velocity tracking control of the master motor and trajectory generation of the slave motor. Special concerns such as the limits of the velocity, acceleration, and jerk are beyond the considerations in the conventional electronic cam motion control. This study proposes the curve-fitting of a Lagrange polynomial to the cam profile, based on trajectory optimization by cubic B-spline interpolation. The proposed algorithms may yield a higher tracking precision than the conventional master-slaves control method does, providing an optimization problem is concerned. The optimization problem contains three dynamic constraints including velocity, acceleration, and jerk of the motor system. 相似文献
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导轨是决定内曲线液压马达性能和寿命的一个关键零件。它的内曲线表面一般要采用靠模仿形加工。其靠模凸轮的计算要求很精确,因此必须采用电子计算机计算。本文介绍导轨曲线的设计、靠模凸轮的座标计算和电子计算机的源程序,并通过实例说明靠模凸轮计算的全部过程。 相似文献
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Jin-Ho Lee Sun-Kyu Lee 《The International Journal of Advanced Manufacturing Technology》2004,23(1-2):102-109
This paper describes a system that compensates for machining errors resulting from chucking with separated jaws. In machining a chucked cylindrical workpiece, degradation in machining accuracy, such as out-of-roundness, is inevitable due to variation in the radial compliance of the chuck workpiece system caused by the position of jaws with respect to the direction of the applied force. To compensate for the machining error induced by chucking compliance, the roundness profile of the workpiece due to chucking compliance after machining should be predicted first. Then, using this prediction profile, a compensating tool feed trajectory can be generated. By synchronizing the cutting tool drive system with the rotation of the workpiece, machining errors induced by chucking compliance can be reduced. To satisfy the condition that the cutting tool feed system must provide both high speed and high position accuracy, a brushless linear DC motor is used. In this study, first, the variation in the radial compliance of the chuck workpiece system is obtained through a force-deflection experiment with a workpiece-chucked lathe. Next, using mathematical equations and the results of the cutting experiment, a workpiece profile prediction and its compensating tool trajectory are generated. Then, the configuration of the compensation system based on a linear motor is described, and a proportional integral derivative (PID) controller is designed to improve the system performance. Finally, the tracking performance of the system is confirmed by experiment. A real cutting experiment shows significant improvement in roundness. 相似文献
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B. Satyanarayana P. N. Rao N. K. Tewari 《The International Journal of Advanced Manufacturing Technology》1988,3(4):105-125
The concept of NC (Numerical Control) and CNC (Computerised Numerical Control) in machine tools has contributed a great deal
to automation and flexibility in manufacturing. In small/medium batch manufacturing, machining of complex contours with conventional
machining is neither economical nor accurate. These can be achieved on a CNC machining centre more economically.
The can machining system is designed to provide the necessary CNC program blocks for machining the plate cam profiles. The
cam profiles can be defined by geometric curves, by follower motion or through a set of points. A promising new concept for
approximating the tool path close to the defined cam profile, within the specified tolerance, has been proposed. The CLIP
algorithm, presented in this paper, automatically chooses the best of the available interpolations (e.g. linear and circular
interpolations) for selecting the intermediate points on the profile to guide the cutter for machining the profile. It provides
the minimum number of intermediate points. This module can also be used for machining the elliptical profiles and pockets.
The cam module, with little modification, is also used for machining the scroll threads of any pitch. 相似文献