共查询到20条相似文献,搜索用时 46 毫秒
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本文利用坐标更换矩阵作五坐标联动时各坐标运动分量计算,建立了五坐标五联动加工时各坐标分量计算数学模型,并给出了通用算法及结果。 相似文献
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五坐标数控是基于任一空间关量均可由二次旋转而得,因而能使对具处于任意位置和方向,从而获得最佳的切削效果和生产效率。与三坐标数控加工相比,五坐标数控加工有许多特点。一、三坐标与五坐标加工比较由于用球头铣刀成型加工时,球头刀与工件表面的逼近是球面的运动去逼近,以点成型,而用端铣刀加了湖面是用平面的运动去逼近待加工表面,以面带成型,而且还可以保证加工点切削速度较高,因而有较好的表面质量。下面用在相同行距干的切削来比较两种加工的残留断面高度。二.三坐标加工图1为用球头对三坐标联动加工时行距与残留表面高度… 相似文献
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常见五坐标联动数控铣床的结构形式及分析 总被引:2,自引:0,他引:2
本文通过对常见五坐标联动数控铣床的结构形式进行研究,指出常见五坐标联动数控铣床可分为9种类型,共36种结构形式,从而为这类机床结构设计的选型与编程的自动化奠定了基础。 相似文献
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四坐标自动焊接机床的数控系统 总被引:6,自引:0,他引:6
阐述自行研制的四坐标数控焊接机床数控系统的组成和功能。着重介绍在恶劣的焊接条件下,如何提高数控系统的抗干扰性能,以及基于轨迹焊接,一些特殊的数控功能的设计与运用。 相似文献
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随着数控加工技术的发展,五坐标联动加工机床越来越多的应用于机械加工中。本文就北京机电院开发的五坐标加工中心在东汽厂大型汽轮机长叶片型面加工中的使用情况做一简单介绍。 相似文献
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确定进行齿轮减速器的优化设计目标函数与设计变量,建立约束函数得出相应的约束方程,采用内点惩罚函数法进行优化设计,计算结果表明,优化设计的效果显著。 相似文献
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Optimization of helix angle for helical gear system 总被引:1,自引:0,他引:1
A method is presented to optimize the helix angle of a helical gear from the viewpoint of the transmission error, which is
the deflection of the teeth due to the transmitted load. The deflection of the gear teeth is calculated by using the bending
and shear influence function, which is formulated from the common formula for deflection obtained from FEM, and the contact
influence function based on Hertzian contact theory. Tooth contact analysis is performed to calculate the contact lines of
the helical gear, where the deflection of the tooth is measured. A numerical example is presented to explain a method to optimize
the helix angle of a helical gear system. The relation between the contact ratio and transmission error is investigated through
calculations of the variation in the transmission error with the helix angle.
This paper was recommended for publication in revised form by Associate Editor Hong Hee Yoo 相似文献
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Modeling of helical gear contact with tooth deflection 总被引:1,自引:0,他引:1
The majority of gear tribological studies are made on spur gears. However, helical gears are generally used in industry, and their contact behavior deserves more attention to establish a realistic base for detailed friction, wear and life studies. This study focuses on the modeling of helical gear contact with tooth deflection. A calculation model for helical gear contact analysis is introduced. Helical gear surface profiles are constructed from gear tool geometry by simulating the hobbing process. The model uses three-dimensional finite elements for the calculation of tooth deflection including tooth bending, shearing and tooth foundation flexibility. The model combines contact analysis with structural analysis to avoid large meshes. Tooth foundation flexibility was found to have an essential role in contact load sharing between the meshing teeth, whereas contact flexibility plays only a minor role. The capability of different local contact calculation methods was also studied. 相似文献
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Shyue-Cheng Yang 《The International Journal of Advanced Manufacturing Technology》2005,26(5-6):448-456
This paper describes a simple approach based on the gear theory for deriving a helical gear with asymmetric involute teeth. A helical gear with asymmetric involute teeth can be easily obtained through the envelope theory for the one-parameter family of surfaces. The mathematical models for asymmetric helical gears can be provided by the application of two imaginary rack cutters. The investigation on the undercutting analysis of the asymmetric helical gear is studied based on the developed mathematical model and the method of tooth-profile shifting. Here we provide geometric modeling of the designed asymmetric helical gear meshing when assembly errors are present. Stress analysis for the helical and the cylindrical forms are constructed. To illustrate the effectiveness of the approach, an analytical expression of helical gear with asymmetric involute teeth is given. 相似文献
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齿轮传动是一种应用非常广泛的机械传动形式,在传动过程中会产生振动、噪声,其振动特性是齿轮装置动力性能的重要指标.粉末冶金齿轮是一种新型工艺制作的齿轮,具有良好的力学性能,其振动特性的研究,对于指导设计高性能的齿轮装置,具有重大意义.设计了基于Labview的齿轮振动信号虚拟仪器系统,分析了粉末冶金斜齿轮和38CrMoAl斜齿轮振动信号特征,结果表明:粉末冶金温压斜齿轮比38CrMoAl斜齿轮振动峰值小,传动更稳定,具有广阔应用前景. 相似文献
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为了得到MC斜齿轮在啮合过程中的接触线特性并对齿轮承载能力进行判断,应用Solid-Works软件建立MC尼龙斜齿轮的三维几何模型,再利用HyperMesh对其进行精确网格划分,最后导入至ANSYS中建立有限元模型,用瞬态动力学中的full法计算分析斜齿轮的啮合传动过程,获得了MC尼龙斜齿轮啮合过程中齿轮应力分布规律。结果表明,齿轮的最大应力出现在齿根位置,齿轮接触线宽度为1.33mm,接触线倾斜角与齿轮螺旋角大致相等,同时还得到了齿根应力谱,为齿轮疲劳寿命计算提供依据。 相似文献