共查询到20条相似文献,搜索用时 703 毫秒
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小曲率曲面的机械电解抛光 总被引:1,自引:0,他引:1
机械电解加工由于具有加工效率高、表面质量好等优点,在机械零件的抛光中得到广泛应用,尤其是在平面和回转面中取得了非常好的效果。但对曲面来说,由于其形状较复杂,在特种加工甚至常规加工中一般都采用球头工具。虽然球头工具适应性强,但其加工方式为点接触,效率难以令人满意。而采用浮动端磨盘抛光式,工具因其本身具有自定位能力,属于面接触加工,因此加工效率和质量都优于球头工具。 在常规加工中浮动工具一般为手工操作,抛磨力大小由操作者掌握,而对数控或机器人抛光来说,抛磨力大小最好由弹簧来控制,以达到供液方便、… 相似文献
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为了更好实现光学自由曲面的有效加工,根据计算机控制光学表面成型技术原理,将工业机器人与气囊抛光技术相结合,提出一种光学自由曲面加工的新方法。本文首先建立了机器人抛光系统,分析了气囊抛光工具与工件表面的抛光位姿关系,然后根据气囊抛光工具与工件表面的数学关系,提出一种气囊抛光工具的位姿求取算法。在此基础上,以六轴工业机器人为实验平台,对确定的自由曲面进行计算验证,规划出抛光路径,推导了气囊抛光工具姿态控制算法。结果表明,该位姿求取算法满足机器人气囊抛光技术的要求,能够实现理想的抛光工具姿态控制。 相似文献
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应用于模具自由曲面的新型气囊抛光技术 总被引:16,自引:1,他引:15
为提高模具自由曲面抛光的效率和品质,提出一种基于柔性抛光理念的新型气囊抛光技术。建立相应的机器人抛光系统,研究旋转型膨胀气囊抛光工具及抛光过程中各因素对抛光表面粗糙度的影响。对气囊抛光工具的位置和姿态控制问题以及抛光工具,以一定下陷深度和倾斜角度与被抛工件接触时的接触区域的相关特性进行分析。在机器人抛光系统上进行抛光正交试验和试验数据分析,获取表面粗糙度的不同影响因数的最优参数组合,试验中被抛光曲面平均表面粗糙度达到了0.007 μm。研究结果表明,气囊抛光技术可实现抛光工具与被抛光工件的大面积柔性接触,通过气囊内部气压的调节和机器人抛光系统对抛光工具的运动轨迹和姿态的精确控制,可有效地提升自由曲面抛光的品质和效率。 相似文献
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M.Es. Abdel Moneim 《Wear》1980,58(1):173-192
The edge of a cutting tool has an important effect on the integrity of the machined surface and the elastic deflections of the cutting tool. This study describes the result of a theoretical and experimental study of the subject based on the identification of a stable build-up formation. The theoretical analyses represent upper-bound solutions. Both nominally sharp tools and tools with relative large sharpness radii were used in the experimental investigations. 相似文献
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文章根据数控机床滚珠丝杠常用安装结构形式,运用直杆纵向弹性支承简化模型对数控机床滚珠丝杠工作时的轴向工况进行简化,采用Laplace变换和弹性振动理论对数控机床的滚珠丝杠纵向振动进行了建模研究,导出了弹性直杆在不同边界条件下固有纵振时的振型函数及频率特征方程。通过实例证明了方法与模型的简便和可行。 相似文献
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Kozo Osakada 《International Journal of Mechanical Sciences》1977,19(7):413-421
A mechanism for the trapping of liquid lubricant in compressive metal forming is suggested. The basis of this mechanism is the interaction of elastic deformation of the tool and the hydrodynamic behaviour of the lubricant. A computer simulation of the process of slow speed compression of a cylindrical rigid-plastic billet between semi-infinite elastic tools with films of lubricant illustrates the validity of the proposed mechanism. From the result of the simulation together with dimensional analysis, the thickness of the trapped lubricant film is determined as a function of the lubricant viscosity, the elastic constant of the tool, the speed of compression and the radius of the billet. 相似文献
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The productivity and precision of machining will be modified if elastic tools are used to remove sharp edges. Experimental data on such rounding are presented, and a mathematical model is formulated. 相似文献
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振动对仪器和机床的精度都有较大影响,对其进行准确检测和分析,是实现振动有效控制的前提。 本研究提出了一种
高灵敏度和低耦合三维弹性机构及其参数优化方法。 介绍了三维弹性机构的构型,并通过理论建模、参数优化和仿真分析完成
了三维弹性机构的设计和优化,最后将该弹性机构与高灵敏度、低耦合传感系统相结合,研制了高性能三维低频加速度计系统,
并实测了加速度计系统的性能参数。 根据实验结果,使用该弹性机构的三维加速度计的灵敏度优于 2. 0 V/ (m·s
-2
),耦合误差
低于 1. 5% ,以及频率响应范围为 1~ 13 Hz,符合设计要求。 因此,本研究所提出的三维弹性机构具有三维等灵敏度和低耦合的
特点,可以广泛应用于各种三维加速度计。 相似文献
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A. A. Krasnoshchekov B. V. Sobol’ A. N. Solov’ev A. V. Cherpakov 《Russian Journal of Nondestructive Testing》2011,47(6):412-419
A method for the identification of defects in elastic structural elements (SEs) on the basis of artificial neural network
(ANN) tools was proposed. The problems of constructing a simulation model of an object, the optimal arrangement of transducers
with the use of a genetic algorithm, and the subsequent identification of a defect were solved. The application of different
learning architectures and algorithms to feed-forward neural networks (FFNs) was studied and the influence of errors on the
estimation accuracy of the parameters of a defect was analyzed. 相似文献
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To understand the effects of cutting velocity, tool elastic deformation generated by high normal stresses during metal cutting processing and artificial tool flank wear on the cutting process, an iterative mathematical model for calculating the tool–workpiece contact problem was developed in this paper under the assumption of elastic cutting tools. In this model, the finite element method is used to simulate cutting of mild steel by the P20 cutting tool with constant artifical tool flank wear under the condition of three different cutting velocities. The results obtained in the simulation were found to match the experimental data reported by related studies. The simulation results also indicate that the thrust and the cutting forces are functions of cutting velocity. Besides, both the normal stress on the tool rake face and the residual stress of machined workpiece generally decrease with increase in cutting velocity. According to the findings in this study, though the residual stress of the machined workpiece decreases as the cutting velocity increases, its value is still higher than that in ordinary conditions due both to the influence of tool flank wear and tool elastic deformation. Also, the phenomenon of curvature at the workpiece end easily occurs. 相似文献
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A reply to Maurice et al.'s comment on "Bragg's Law Diffraction Simulations for Electron Backscatter Diffraction" is presented. A new method for microscope geometry calibration is briefly presented. Also, evidence that simple diffraction simulations can be profitable tools for absolute elastic strain measurements in crystalline materials is reiterated. 相似文献