用立铣刀端面加工螺旋面

我厂产品中有如图1所示的一批零件,在圆周上,有3个均布的小凸台,在小凸台上需加工出一个与底面成θ角,同时又有一个螺旋升角为α的斜面。由于零件上有一较高的突出物(图中未画出),无法采用车削加工。考虑到生产成本,在普通铣床上用分度头挂轮带动横向拖板进给,以满足螺旋升角α的要求,同时利用立铣刀的端面进行加工,达到图纸要求。     

加工具有尖点廓形螺旋面工件的铣刀设计

加工具有尖点廓形螺旋面工件的铣刀设计中南工学院（衡阳４２１００１）刘杰华１．引言按通常方法设计的铣刀加工的螺旋面工件廓形大都是由一段光滑曲线或由曲线与直线光滑连接构成，即构成其廓形的曲线和直线的交接点处存在公切线。但对于某些特殊工件（如压缩机螺杆转子...     

圆柱铣刀加工螺旋锥铣刀的数控加工和成形理论

提出了螺旋锥铣刀的精确成形理论,在普通数控铣床上增加一套简易铣齿装置便可加工螺旋锥铣刀。     

锥形铣刀螺旋面刀具路径策略的新思路

从运动学的角度对螺旋曲面加工进行研究,找出其曲面上的曲线上存在着活动的特征标识,提出了模仿特征标识沿曲面曲线运动的加工法。并以锥形铣刀等螺旋角刀槽作为加工实例,应用特征加工法使程序得到最大限度的简化,极大地提高编程效率,对类似零件的数控加工提供有益的参考。     

根切曲面及锥铣刀的展成法加工

提出用展成法的根切面来形成锥铣刀的刀齿齿廓。     

导套式强力端面铣刀

图1是材料为ZG310～570较大型的铸造零件。在它周围各耳朵的20个端面都需要进行加工,由于加工余量大,材料硬度高,再加上加工面较深,所以铣削起来很困难。为此,我们设计制造了图2所示的导套式强力端面铣刀。平键8和圆螺母10把刀盘1与导套7连接为一体。因为它是间断切削,必然要产生振动,为了提高刀具的强度和刚度,我们把导套7与刀杆12设计为扁圆形连接,间隙配合。当你     

螺旋锥铣刀的数控加工和成形理论

本文提出了螺旋锥铣刀的精确成形理论.在普通数控铣床上增加一套简易铣齿装置便可加工螺旋锥铣刀.     

用于弧齿锥齿轮铣刀盘调整的非接触式测量方法

采用接触方式对弧齿锥齿轮装配式铣刀盘刀刃径向跳动测量时存在接触力的影响,由于接触力大小不定,增加了测量系统误差.采用激光位移传感器对弧齿锥齿轮装配式铣刀盘刀刃径向跳动进行非接触式测量.通过对测量数据分析,数据自动提取,实现对切削刃径向跳动的测量.该方法有效地避免了传统的接触式测量的不利因素,提高了测量的重复精度及测量效...     

Application of a variable flow stress machining theory to helical end milling

A methodology of modeling chip geometry of flat helical end milling based on a variable flow stress machining theory is presented in this article. The proposed model is concerned with the variation of the width of cut thickness. The nonuniform chip thickness geometry is discretized into several segments based on the radial depth of cut. The chip geometry for each segment is considered to be constant by taking the average value of the maximum and minimum chip thickness. The maximum chip thickness for each chip segment is computed based on the current width of cut, feed per tooth and the cutter diameter. The subsequent radial depth of cut is subtracted from the discretized size of the width of cut to obtain the minimum chip thicknesses. The forces for each segment are summed to obtain the total forces acting on the system of the workpiece and the tool. The cutting forces can be predicted from input data of work material properties, cutter configuration and the cutting conditions used. The validation of the proposed model is achieved by correlating experimental results with the predicted results obtained.     

Prediction of cutting forces and machining error in ball end milling of curved surfaces -II experimental verification

This paper presents the results of a series of experiments performed to examine the validity of a theoretical model for evaluation of cutting forces and machining error in ball end milling of curved surfaces. The experiments are carried out at various cutting conditions, for both contouring and ramping of convex and concave surfaces. A high precision machining center is used in the cutting tests. In contouring, the machining error is measured with an electric micrometer, while in ramping it is measured on a 3-coordinate measuring machine. The results show that in contouring, the cutting force component that influences the machining error decreases with an increase in milling position angle, while in ramping, the two force components that influence the machining error are hardly affected by the milling position angle. Moreover, in contouring, high machining accuracy is achieved in “Up cross-feed, Up cut” and “Down cross-feed, Down cut” modes, while in ramping, high machining accuracy is achieved in “Left cross-feed, Downward cut” and “Right cross-feed, Upward cut” modes. The theoretical and experimental results show reasonably good agreement.     

用圆柱铣刀与不可展直纹面的二阶切触及蒸汽机车排汽叶轮加工

把微分几何中曲线与曲面之间的“切触”概念应用于不可展直纹面的数控加工，提出用圆柱铣刀的外圆在五坐标联动中加工的最不可展直纹面最佳切触条件。并应用于蒸汽机车排汽叶轮加工。     

五轴NC车铣加工自由曲面的问题

阐述用平头铣刀五轴NC车铣法加工自由曲面微机辅助编程的问题。介绍用双三次参数曲线拟合曲面、平头铣刀的直径、铣削的步长及行距选择、刀位点和刀轴矢量的计算。给出车铣机床五轴联动坐标值及转角的计算公式。     

球头立铣刀铣削加工表面粗糙度仿真技术研究

铣削加工表面粗糙度的形成与铣刀和工件振动、主轴偏心、刀具磨损、刀具变形等物理和几何因素有关。多年来中外学者针对各种影响因素建立了“相对单一”的数学模型。这些数学模型只考虑了一种或两种影响因素,还没有建立起描述物理和几何变化过程的综合数学模型,为此对这些相关因素进行了深入研究,建立了基于球头立铣刀的铣削加工表面粗糙度仿真的整体数学模型。从而为虚拟数控加工仿真提供技术支撑。     

弧齿锥齿轮几何传动误差的设计与分析

提出基于传动误差设计的概念和方法。通过TCA和LTCA对传动误差曲线的设计进行啮合仿真分析的结果表明 ,根据工作载荷合理地确定传动误差转换点处的幅值与总的幅值 ,可降低弧齿锥齿轮对误差的敏感性 ,可使工作载荷下传动误差波动幅值最小 ,同时可有效地避免或减轻边缘接触。     

Prediction of cutting forces and machining error in ball end milling of curved surfaces -I theoretical analysis

This paper presents a theoretical model by which cutting forces and machining error in ball end milling of curved surfaces can be predicted. The actual trochoidal paths of the cutting edges are considered in the evaluation of the chip geometry. The cutting forces are evaluated based on the theory of oblique cutting. The machining errors resulting from force induced tool deflections are calculated at various parts of the machined surface. The influences of various cutting conditions, cutting styles and cutting modes on cutting forces and machining error are investigated. The results of this study show that in contouring, the cutting force component which influences the machining error decreases with increase in milling position angle; while in ramping, the two force components which influence machining error are hardly affected by the milling position angle. It is further seen that in contouring, down cross-feed yields higher accuracy than up cross-feed, while in ramping, right cross-feed yields higher accuracy than left cross-feed. The machining error generally decreases with increase in milling position angle.     

锥形螺旋铣刀的数控加工及成形原理

介绍了在普通数控铣床上利用简易铣齿装置加工锥形螺旋铣刀的方法及成形原理。     

面向加工中心的高速铣刀优选系统

针对加工中心高速铣削中刀具及其切削参数选择问题,以已有高速铣削机理研究成果为基础,进行工件高速铣削加工特征研究,并建立高速铣刀优选目标模型和优选规则,完成了基于关系型数据库的高速铣刀优选系统的开发.结果表明,采用该系统优选的铣刀及其切削参数进行高速铣削加工,能有效提高加工品质和加工效率、降低加工成本.