共查询到13条相似文献,搜索用时 46 毫秒
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超精密车床内嵌式PLC的硬件设计 总被引:1,自引:0,他引:1
结合HCM-Ⅰ型超精密车床的实际情况,阐明了采用内嵌式可编程控制器的必要性,详细介绍了内嵌式PLC的结构及工作原理,给出了PLC关键硬件技术的设计原理及电路图 相似文献
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通过对无卡轴旋切机床的工作原理、传动过程和刀架进给期望速度函数的分析,指出旋切控制的关键在于刀具进给与原木实际转动速度的配合。采用旋转编码器实时检测原木转动线速度以及刀架进给速度,使用数字控制器和无速度传感器异步电动机矢量控制对刀架进给过程进行控制,从而实现了无卡轴旋切机床进刀速度伺服控制。该控制方法通过引入实际原木转速和刀架进给速度的反馈,采用自适应模糊控制策略有效地提高了系统的精度和抗干扰能力。理论与应用实践证明,该方法具有良好的应用价值和市场开发前景。 相似文献
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系统地分析了车床主传动系统方案决策的优化设计方法 ,并从图论理论出发 ,运用分级模块式设计方法 ,提出了一种优化车床主传动系统设计方案的新方法 ,建立了数学模型和优化方法 ,该方法和程序可用于车床变速箱传动方案的优化设计 ,可提高设计精度 ,缩短设计时间 相似文献
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Professor Jeong-Du Kim Dong-Sik Kim 《The International Journal of Advanced Manufacturing Technology》1997,13(3):164-171
This paper deals with the detailed development of an ultraprecision lathe for the purpose of machining magnetic disks. The rotational and feed accuracy and stiffness of the air bearing and the air slide were tested, respectively. A microcutting device using a piezoelectric material was also developed in order to maintain a uniform and precise depth of cut. Experiments machining a magnetic disk were carried out.Nomenclature
A [m2]
Area of piezoelectric actuator
-
C
o [mF]
Capacitance of PZT
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d
33 [m V–1]
Piezoelectric constant
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K
f
[N V–1]
Equivalent force constant
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K
m
[N m–1]
Coefficient of force feedback
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k
h
[N m–1]
Stiffness of hinge
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l [m]
Length of PZT
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M [kg]
Mass of PZT system
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r [mm]
Radius of notch
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U [m]
Displacement of piezoelectric
- 3 [F m–1]
Dielectric constant of PZT
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b [mm]
Width of hinge
-
D
e
[N s–1]
Equivalent damping coefficient
-
F
l [N]
External load
-
K
e
[N m–1]
Equivalent stiffness of PZT
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k [m2 N–1]
Elastic compliance of PZT
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L [mm]
Distance between hinge holes
-
M
e
[kg]
Equivalent mass of PZT
-
R
o [W]
Output impedance of amp.
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t [mm]
Thickness between hinge holes
-
V
i
[V]
Input voltage
- [g cm–3]
Density of PZT 相似文献
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基于成组技术的车床快速设计系统的研制 总被引:2,自引:0,他引:2
以车床快速设计为例提出了基于成组技术进行产品快速设计的基本思想和设计方法,将成组技术应用到产品的三维设计中,根据拟定的设计相似性标准将设计产品的零部件分类成组形成设计族;针对不同的设计族,建立起能够集中全族所有功能要素的实例模型,并根据企业标准对其进行标准化处理,建立带有成组编码信息的三维模型实例库,供技术人员在设计时检索、编辑、修改,在此基础上形成新的设计,从而提高企业的设计效率和设计水平。 相似文献
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Geometric errors remarkably affect the dimensional accuracy of parts manufactured by ultra-precision machining. It is vital to consider the workpiece shape for the identification of crucial error types. This research investigates the prioritization analysis of geometric errors for arbitrary curved surfaces by using random forest. By utilizing multi-body system (MBS) theory, a volumetric error model is initially established to calculate tool position errors. An error dataset, which contains information of 21 geometric errors, workpiece shape, and dimensional errors, is then constructed by discretizing the workpiece surface along the tool path. The problem of identifying crucial geometric errors is translated into another problem of feature selection by applying random forest on the error dataset. Moreover, the influence extent of each geometric error on the dimensional accuracy of four typical curved surfaces is analyzed through numerical simulation, and crucial geometric errors are identified based on the proposed method. Then, an iterative method of error compensation is proposed to verify the reasonability of the determined crucial geometric errors by specifically compensating them. Finally, under compensated and uncompensated conditions, two sinusoidal grid surfaces are machined on an ultra-precision lathe to validate the prioritization analysis method. Findings show that the machining accuracy of the sinusoidal grid surface with crucial geometric error compensation is better than that without compensation. 相似文献
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提出了一种宏/微双驱动微进给机构的设计与控制方法。介绍了宏/微双驱动微位移机构的结构设计,将宏动(大行程)和微动(高分辨率)两者串联以获得理想的运动性能。该机构用步进电机作为宏动的驱动装置以获得大行程和高响应速度,用压电陶瓷微位移器作为精密运动以提高运动分辨率和运动精度。设计了该机构的控制系统,用一个基于模型的开关控制器对微位移装置进行控制,并设计专门的运动分配模块对宏/微运动进行协调控制。最后,分别控制宏动和微动装置对该系统进行了实验,并用激光干涉仪检测。检测结果表明,宏动装置的行程为90 mm,运动分辨率为0.3 μm;压电陶瓷微动装置的行程为40 μm,定位精度为0.9 μm。理论分析和实验结果均表明了控制策略的有效性。 相似文献