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《机械制造与自动化》2017,(3):75-78
针对FANUC系统主轴换挡的各种形式,在深入分析M型B方式换挡的基础上,通过合理设置系统换挡相关参数,编制PMC控制程序,实现了原加工中心主轴自动换挡的功能。最终调试的实验结果表明,设计控制程序能够使主轴可在高、中、低三挡之间顺利切换,换挡中无脱档、换挡不到位、挡位不合理等现象,为同类机床的主轴自动换挡提供了借鉴经验。 相似文献
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数控机床的主轴性能是在很宽范围内转速连续可调,恒功率范围宽,当要求机床有螺纹加工功能、准停功能和恒速加工等功能时,则需要对主轴进行进给控制和位置控制。主轴驱动变速目前主要有两种形式:一是主轴电动机带齿轮换挡;二是主轴电动机通过同步齿形带或是V型带驱动主轴。 相似文献
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进给机构一般采用普通齿轮或蜗轮传动,其传动链长,结构复杂,如采用一齿差齿轮进给机构,传动链短,结构简单,效率高。图1a 是采用一齿差进给机构的镗孔机头,图1b 是其传动原理图,现作如下介绍。1.传动原理:电动机的旋转运动经变速后传到齿轮7(电动机及变速机构未画出),带动主轴套4旋转,主轴套4通过钩头键3带动主轴1逆时针方向旋转,固定在主轴后面的螺母5和主轴一起旋转。另外,齿轮7通过长键及顶套和长齿轮8联在一起,齿轮8与齿轮13啮合,齿轮13在固定轴12上滑动,便能与双联齿轮10的两个齿分别啮合。齿轮10通过长键与丝杆联结在一起转动,由于丝杆转动使螺母带着主轴实现进刀和退刀。 相似文献
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针对间隙非线性对数控摆角铣头传动精度的影响,提出采用双电动机驱动双蜗轮蜗杆副的消隙方法,即控制一侧电动机的转角和两侧电动机的同步差来精确控制蜗轮蜗杆副的转角,进而控制主轴的摆角。消隙时,一侧蜗杆与蜗轮正向旋转的齿面啮合,另一侧蜗杆与蜗轮反向旋转的齿面啮合。工作时,一侧电动机驱动,另一侧电动机保持同步随动,避免因自锁产生干涉,从而消除主轴摆动的传动间隙,提高了主轴的摆动精度。通过建立消隙机构的数学模型并进行仿真实验,验证了该消隙方法的有效性和可行性。 相似文献
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雍其斌 《机械工人(冷加工)》2003,(5):46-47
一、问题的提出 我厂生产的CJK360数控车床,其主传动部分为交流异步电动机经V带和主轴箱带动主轴转动。鉴于电动机转速恒定,主轴转速的变化必须通过停车、换挡来实现,这样一来常常不能满足实际切削速度变化的要求,影响加工精度、表面粗糙度及生产效率。 相似文献
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洪达 《机械工人(冷加工)》1987,(5)
快速换挡的滑移齿轮,在齿端需进行高低齿倒圆角(图1),它是减少两轮齿端部顶齿的好方法。它既可降低齿轮变速时的噪音,又可避免齿端撞毛。因我国目前还没有倒高低齿圆角的倒角机,使这项技术的推广受到影 相似文献
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范芳洪 《机械工程与自动化》2011,(5)
主轴运动是数控机床上一种比较重要的运动,不同的场合要求有不同的控制方式。探讨了西门子840D数控系统常用的两种主轴控制方式的应用场合及其控制方法,以及主轴换档的时序关系和换档中简单故障的处理。 相似文献
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Ahmed A. D. Sarhan 《The International Journal of Advanced Manufacturing Technology》2014,70(5-8):957-963
As the demand for high speed and highly accurate machines has significantly increased, error motions from thermal change, which is up to 70 % of the total machining error, is found to be the main hurdles to overcome in improving the accuracy of CNC machine tools. In this research work, the authors installed four eddy current displacement sensors in the spindle structure near to the front bearing to monitor the spindle offset in the bearing level, which is mainly attributable to the thermal error motions of the spindle. In addition, another three capacitance sensors are mounted on the machine table level and aligned with the x-, y-, and z-axis of the machine to monitor the spindle shift in the table level to find out the correlation between temperature change and the thermal error motions of the spindle. To measure the temperature changes, we attached thermal sensors in the machine and cooling system. The estimation of the spindle thermal displacement based on temperature data from these thermal sensors can provide more information for the monitoring of thermal error motions of the spindle. 相似文献
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Experimental Study of a Precision, Hydrodynamic Wheel Spindle for Submicron Cylindrical Grinding 总被引:1,自引:0,他引:1
Hydrodynamic journal bearings have been widely used in various types of rotating machinery, ranging from heavy duty, high-impact applications, such as the crank shaft of an internal combustion engine and turbine rotor, to high-precision, light load applications, such as precision spindles in cylindrical grinding machines. Although extensive theoretical and experimental results have been presented for hydrodynamic bearings, the available literature seems to be limited for precision hydrodynamic bearing spindles. In this study, practical methods have been developed to quantify the performance of a hydrodynamic wheel spindle operating in the horizontal mode to produce precision parts with submicron roundness tolerance and very fine surface finish. These methods can easily and cost effectively be implemented on various machines in an actual production environment for effective predictive maintenance. The main experimental results show that the long-term drift of the spindle at steady state is less than 1 μm vertically and 0.2 μm horizontally, and the radial error motion of the spindle based on unfiltered data is less than 1.6 μm for all the speeds tested. It is also found that the shaft center position (vertical lift and horizontal shift) at the cold condition is substantially different from that in the steady-state warm condition. From the results, an optimal spindle speed is recommended. 相似文献
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