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针对刀库自动换刀装置中的凸轮,通过传统的空间包络共轭原理设计计算弧面凸轮,根据平面四连杆运动特性设计计算了平面槽凸轮,利用VC6.0编写凸轮设计程序,生成两种凸轮的加工数据与凸轮廓面数据,将廓面数据导入Pro/E,对自动换刀机构中凸轮实体进行建模与装配,装配过程中,及时修改了装配错误,重新绘制了零件图,特别是针对凸轮Pro/E建模,能够验证设计凸轮加工数据的正确性,分析了设计过程中出现的弧面凸轮的薄脊问题,运用Pro/E对自动换刀机构的运动仿真,检测了凸轮机构干涉,最终得出符合运动学特性的ATC凸轮。 相似文献
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先推导了任意回转面滚子从动件弧面凸轮的廓面方程,进一步得到了球形滚子弧面凸轮廓面方程.基于Pro/E软件构建了球形滚子弧面凸轮分度机构的三维模型,并进行了运动仿真;采用间接指定刀位轨迹的方法获得了弧面凸轮廓面的数控/加工代码,并进行了创成仿真,从而实现了弧面凸轮的CAD/CAM一体化. 相似文献
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采用圆锥滚子轮齿创成弧面分度凸轮廓面,与球形滚子齿实现点接触共轭,构建一种新型的点啮合式弧面凸轮分度机构装置,文中给出了该机构的技术实施方案,通过改变球形滚子齿的球体半径来实现可控点啮合,能够提高此机构对制造和安装误差的适应性。运用媒介共轭的原理与方法,分析了此种间歇运动机构的啮合原理,运用给出的媒介曲面(圆锥滚子轮齿廓面)方程获取其创成的分度凸轮廓面方程的基础上,利用圆锥滚子轮齿廓面与球形滚子轮齿廓面间的线接触关系,推导出分度凸轮廓面与球形滚子廓面间的点啮合条件下的接触迹方程及其诱导曲率方程,以此来确定获取此种高副机构最佳点啮合性能情况下共轭轮齿的运动几何参数。 相似文献
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球形滚子弧面凸轮分度机构是用钢球代替圆柱,实现高精度、零背隙、低噪声的分度装置.文中先推导了任意回转面滚子从动件弧面凸轮的廓面方程,进一步得到了球形滚子弧面凸轮廓面方程;基于Pro/E软件构建了弧面凸轮和球形滚子的三维模型,并进行了运动仿真.运动分析结果表明了文中所提方法的有效性和通用性,为球形滚子弧面凸轮分度机构的运动学和动力学研究奠定了基础. 相似文献
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For an assembled conjugate cam mechanism with two separate oscillating roller followers serving as a conjugation measuring
fixture, when the cams rotate, the variation of the subtending angle between the two follower arms can indicate the variation
of the cam profile errors. The profile errors of the assembled conjugate disk cams can be indirectly calculated by means of
the conjugate variation measurement and the inverse conjugate variation analysis. That is, if a pair of master conjugate cams
with known profile errors is available, by means of the measured subtending angle variations of the follower arms induced
by a pair of assembled conjugate cams that consists of one master cam and the other being the inspected cam, then the actual
profile of the inspected cam can be calculated by applying the inverse conjugate variation analysis. In order to verify the
presented concept, experiments meant to calculate the profile errors of a pair of machined conjugate cams were conducted to
compare with the measuring results obtained by using a coordinate measuring machine. The experimental results showed that
the calculated cam profiles were well consistent with those of the measured ones. The presented method can be an effective
alternative means for examining profile errors of assembled conjugate disk cams and could be useful for the quality control
in mass production of conjugate cams. 相似文献
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The problem of this paper is the high contact stress at the point of contact between the cam and the follower.A pear cam and roller follower mechanism were studied and analyzed for different position of the follower and different contact compression load.The objective of this paper is to study the effect of contact compression load on the contact stress distribution of the cam profile at the point of contact.Four different positions of the follower with the cam was considered(0°,90°,180°,and 270°).The theory of circular plate was applied to derive the analytic solution of the contact stress.The numerical simulation had been done using ANSYS Ver.19.2 package to determine the contact stress,while SolidWorks software was used to investigate follower displacement,velocity,and acceleration.Four distinct values of the compression contact load,such as 3.121 N,6.242 N,9.364 N,and 12.485 N,were used in the numerical simulation.In the experiment setup,a photo-elastic technique was carried out in the field of polarized light to exhibit the stress distribution on the cam specimen.The annealed PSM-4 backalate material was used in the experiment setup.The experimental value of contact stress was checked and verified analytically and numerically at the point of contact.The innovation in this paper the use of spring-damper system which reduce the value of contact stress at the point of contact.The contact stress was maximum 2.136 MPa when the follower located at 270° with the cam,while the contact stress was minimum 1.802 MPa when the follower located at 180°at compression load 12.485 N. 相似文献
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根据运动的合成与分解原理 ,将移动从动件相对于凸轮的复杂平面运动分解为简单的往复运动和定轴转动 ,建立定坐标系和动坐标系 ;然后求出凸轮的理论轮廓和实际轮廓相对于动坐标系的直角坐标方程 ,最后采用坐标旋转变换就得到了凸轮的理论轮廓和实际轮廓相对于定坐标系的直角坐标方程 ,从而为凸轮的设计提供了一种简便实用的新方法 相似文献
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设计盘形凸轮廓线的相对速度法 总被引:1,自引:0,他引:1
提出了一种利用凸轮与从动件的相对速度设计盘形凸轮轮廓的新方法,该方法基于从动件和支承绕凸轮轴线反转的原理,利用从动件上的接触线或者滚子轴线相对固定凸轮的速度和凸轮与从动件的几何关系设计盘 形凸轮轮廓,应用该方法导出了四种不同类型凸轮机构的凸轮廓线的解析表达式,并给出了对应的设计实例。 相似文献
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A general procedure for determining the equivalent radius of curvature and entraining velocity of various oscillating and reciprocating cam and follower mechanisms has been developed. This procedure requires as input the motion of the follower, i.e., the lift curve, the angular velocity of the cam and the basic geometry of the cam and follower mechanism. The radius of curvature of the cam at the point of contact was determined using the method of kinematic coefficients. A vector loop superimposed on the cam and follower was used to determine the entraining velocity of the mechanism at the point of contact. 相似文献