共查询到18条相似文献,搜索用时 78 毫秒
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本文结合机电元件产品开发,研制了面向机电元件的微机CAD系统,在个人微机上,应用绘图软件进行二次开发基础上,根据机电元件实物或零件草图,实现零部件实体造型,模拟装配与实时动态修改设计的方法,并利用软件本身功能的开发,由零部件实体造型自动生成剖视图、局部放大图与尺寸标注注释,最终组合成标准、准确与美观的工程图样,具有广阔的应用前景与工程实用价值。 相似文献
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介绍利用Autodesk MDT软件将三维实体造型技术运用于极化继电器产品设计的方法,并给出KJH-1M化继电器的设计分析实例。 相似文献
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田陆屏 《电子工业专用设备》1994,23(1):47-53
本文通过对电容组装机束腰封口机构精度分析,从理论上对束腰封口的可靠性给予了剖析;并在分析连杆组误差时引出了独立变量法;同时从设计理论上结合实际问题做了凸轮曲线的修正。 相似文献
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三维实体造型交运算算法研究 总被引:3,自引:0,他引:3
王红娟 《信息技术与信息化》2007,(3):68-70
实体间的交、并、差布尔运算是三维实体造型系统中的一种重要造型方法,利用它能够生成复杂的实体。交运算是实体布尔运算的核心,本文重点研究了三维实体交运算的算法。 相似文献
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阐述了卷绕部件在薄膜电容卷绕机中的作用;详细介绍了轮系和凸轮机构的特点及其在卷绕部件中的应用,并根据设备功能要求对轮系和凸轮机构进行了结构设计。 相似文献
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蜗形凸轮是电子工业专用设备中的重要机构,它用来实现交错轴间的分度运动。本文应用齐次变换和微分几何的理论及方法建立了圆锥滚子蜗形凸轮轮廓曲面的数学模型。该模型运用矩阵算法,理论正确,计算精确,便于在计算机上计算。由于蜗形凸轮在使用中,滚子多为圆锥形,因比该模型有较强的实用性,是转位凸轮CAD/CAM系统的重要基础。 相似文献
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Hybrid cam mechanisms 总被引:10,自引:0,他引:10
This paper investigates the problem of driving a machine with several reciprocating heavy inertias. The drive should also realize some programmable flexibility of the motion, so that the operation of the machine, e,g., synchronization between different motions and duration of standstills, can easily be modified. The use of a single servomotor for every motion is not the best solution, since it does not allow for energy recuperation. This means that the installed servomotor power will be much higher than the required net peak power for the machine as a whole. The presented solution, however, reduces the servomotor peak torque and power by one order of magnitude, and makes energy transfer between the motions possible. The hybrid cam mechanism consists of a hybrid drive, which is a combination of a servomotor, a constant velocity motor and a cam follower mechanism. The operation principle exploits the nonlinear characteristics of the cam to add flexibility at low cost of energy. The hybrid solution is particularly successful for motions involving high peak acceleration. In addition, the concept can be used to reject disturbances. Simulations show the performance of the hybrid cam mechanism. 相似文献
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经纬仪调焦机构设计 总被引:2,自引:0,他引:2
调焦机构是变焦距镜头中重要的组成部分,为了满足经纬仪测量中对变焦距镜头的要求,针对目前对变焦距镜头的调焦主要采用凸轮机构的变焦方式体积大、效率低、精度差缺点,本文提出了采用直线驱动的方式进行调焦的原理与方法,介绍了一种应用系统,主要由步进电机、直线导轨、直线位移传感器、DSP控制器等组成,由步进电机驱动,通过齿轮变速和精密丝杠速比变换机构,利用直线位移传感器作为检测元件,带动镜组前后移动来进行距离调焦和温度调焦,从而改变了传统的调焦机械结构。具体给出了测量系统的组成结构和实验结果,并进行了精度影响因素分析。实验结果表明,测量精度可保证在0.005mm内,满足经纬仪测量所需要的结构紧凑、位移精度好的要求。 相似文献
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《Mechatronics》2006,16(2):121-129
A new type engine valve control system has been presented, in which both the valve lift and valve timing are controlled directly by electric motors. A mechanism of the valve timing control system is made of planetary gears. The outer gear is the timing pulley which has a timing belt driven by the crankshaft of an engine. Two planetary gears are inside of the pulley. The gears engage with the inner gear of the pulley. The center of the disc, which has centers of the planetary gear, is connected to the camshaft. Then, the crank rotation is transmitted to the camshaft, and rotations of sun gear are added to the rotations of camshaft. This means that when rotation angle of the sun gear is controlled, the phase between the inlet valve and the exhaust valve can be controlled. The lift control system is made of linear slider and ball screw. The cam shape of this system is three-dimensional. The height of the cam varies along the axis of the shaft. When the ball screw rotates, the camshaft slides in the axial direction, so that the lift of the cam varies. The control method is presented for the mechanism, in which valve phase and the lift are controlled continuously. Experimental tests have been carried out for the system. 相似文献
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通过某型雷达馈源转台中槽轮机构的设计和分析,并附加凸轮带动销轴等辅助定位装置,实现多馈源旋转转换工作和精确定位,满足总体设计要求。 相似文献
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具备连续变焦功能是目前先进红外热像仪的重要特征之一,而变焦凸轮是驱动连续变焦光学系统中各镜组运动的关键部件。为了设计出良好性能的变焦凸轮结构,本文首先应用动态光学理论推导出变焦光学系统的像移补偿组公式得到像移补偿组的轨迹曲线,然后利用序列二次规划法(sequential quadratic programming, SQP)优化算法来减小动态光学曲线的压力角,结合光机设计理论运用Creo进行凸轮曲线生成及凸轮槽切除从而获得变焦凸轮结构。再基于有限元分析理论对凸轮结构进行分析,最终通过变焦系统运动及成像结果确认本文方法可行。 相似文献