试论凸轮基圆偏心对凸轮升程测量的影响

分析了凸轮基圆的圆心与凸轮装机后的回转中心不重合，即凸轮基圆的偏心对凸轮升程测量（凸轮机构从动件运动规律）的影响。     

试论凸轮基圆偏心对凸轮升程测量的影响

分析了凸轮基圆的圆心与凸轮装机后的回转中心不重合 ,即凸轮基圆的偏心对凸轮升程测量 (凸轮机构从动件运动规律 )的影响     

圆锥凸轮基圆半径的求解

给出了直动从动件圆锥凸轮机构中凸轮最小基圆半径r_0的求解式。     

滚子直动从动件圆锥凸轮机构基圆半径的确定方法

本文以求解平面凸轮机构的基本论点为依据，得出滚子直动从动件圆锥凸轮机的基圆半径与许用压力角、曲率半径的关系式。设计是所选用的基圆半径必须同时满足上述两个条件。     

配气凸轮基圆半径的选择及接触应力计算

在配气凸轮机构设计过程中,根据预定的从动件运动规律,利用MATLAB编程计算,能够方便地得到不同转角下凸轮的最小基圆半径和不同基圆半径下的接触应力曲线,为配气凸轮基圆半径的选择和接触应力分析提供了依据。     

内置式平行分度凸轮机构

提出了一种新型的平行分度凸轮机构—内置式平行分度凸轮机构,其特点是销齿圈位于内凸轮基圆内。对新机构的构造和主要参数进行了综合,确定了分度凸轮工作廓面的组成,给出了机构参数设计的计算公式及机构配置的可行方案。基于凸轮的反转原理和理论廓线的几何性质导出了内凸轮的工作廓线方程和压力角计算公式。设计实例的仿真结果表明,内置式平行分度凸轮机构的工作原理是可行的,设计方法是正确的。     

关于等宽凸轮机构中凸轮基圆半径r0及凸轮宽度D的确定

在文献[1,2]研究结果的基础上，再据等宽凸轮机构中凸轮的基圆半径r0与宽度D之间的确定量化关系，得到了确定平底直动、摆动从动件等宽凸机构的ro与D的正确方法。     

滚子摆动推杆盘形凸轮机构的凸轮最小基圆半径和最佳匹配摆杆长度

在分析凸轮机构各种设计方法的优缺点的基础上，给出了求解滚子摆动推杆盘形凸轮机构的凸轮最小基圆半径和最佳匹配罢杆长度的简易设计方法．     

适用于凸轮机构数字化设计的基圆半径与偏距的分析

根据偏置凸轮机构的运动几何关系公式,用许用压力角代替最大压力角,得出凸轮设计基圆半径与偏距的关系式。根据凸轮机构的受力情况,分析偏置凸轮机构（与对心凸轮机构相比）的优劣,从而得出偏距的取值范围.分析凸轮机构从动件的常用运动规律,并分别得到基圆半径与偏距的最优函数关系式。为凸轮机构的数字化设计提供便利条件。     

两种推杆运动规律的确定凸轮基圆半径诺模图

两种推杆运动规律的确定凸轮基圆半径诺模图汪萍侯慕英田野（内蒙古工业大学机械系０１００６２）１引言确定凸轮的基圆半径是凸轮机构设计中的一个重要问题。凸轮基圆的大小除了必须考虑凸轮轴尺寸的结构因素外，在一般情况下都是按机构压力角不超过许用值为原则来进行...     

基于SOM-Kmeans的机床能效等级评价方法

机床能效等级评价是提高能源效率的基础。现有机床能效评价方法多运用能量利用率和比能等指标评价特定加工过程能效,未考虑加工能力对机床能效评价的影响,致使无法综合评价机床能效等级。为此,从机床加工能力和能耗特性角度构建机床能效等级评价指标,提出基于自组织映射神经网络-K均值(SOM-Kmeans)的机床能效等级评价方法。首先,分析机床加工能力特性和时段能耗特性,构建机床加工能力指标和多时段能耗特性指标;其次,运用SOM-Kmeans对机床能效信息进行聚类分析,并采用主成分分析法(PCA)对机床能效等级进行综合评价;最后,通过实际案例验证了所提方法的有效性和实用性。     

Process parameter definition with respect to the behaviour of complex kinematic machine tools

The definition of machining processes with respect to complex kinematic machine tool behaviour involves the control of machine accuracy and kinematic performances. The aim is to propose process settings and tool paths which guarantee the required machining quality while maximizing productivity. This article presents an experimental protocol which enables the determination of machine tool structure behaviours which have an influence on machining quality. In parallel, an experimental analysis of the different kinds of settings which can improve machining quality is carried out. Two kinds of settings appear: the first class of settings improves machining quality or machining time, and the second class has an antagonistic influence on machining quality and machining time. Thus, the definition of the second class of settings arises from an optimisation between first-order defects, second-order defects and machining time. The developed method is illustrated on a parallel kinematic machine tool, the Tripteor X7. Note that this study is a first step towards controlling machine tool behaviour during machining.     

多功能车铣镗复合专用机床结构

介绍了一种多功能车铣镗复合专用机床结构,通过机床布局的结合方式变换,在一次装夹中完成对回转体零件车铣加工和支架零件铣镗加工的效果,做到结合方便、一机多用,实现机械加工的车铣复合、铣镗复合加工的综合功能。     

实现微小型回转体零件完整加工的技术

具有车铣能力的车铣加工中心是实现完整加工的典型机床,更由于车铣技术在加工微小型回转类零件中所拥有的独特优势,使微小型零件的完整加工成为可能;加工实验证明,对于以回转体为基体的微小型零件的加工,车铣加工中心将微细车铣技术和完整加工完美地结合在一起.     

Integrated simulation method for interaction between manufacturing process and machine tool

The interaction between the machining process and the machine tool (IMPMT) plays an important role on high precision components manufacturing. However, most researches are focused on the machining process or the machine tool separately, and the interaction between them has been always overlooked. In this paper, a novel simplified method is proposed to realize the simulation of IMPMT by combining use the finite element method and state space method. In this method, the transfer function of the machine tool is built as a small state space. The small state space is obtained from the complicated finite element model of the whole machine tool. Furthermore, the control system of the machine tool is integrated with the transfer function of the machine tool to generate the cutting trajectory. Then, the tool tip response under the cutting force is used to predict the machined surface. Finally, a case study is carried out for a fly-cutting machining process, the dynamic response analysis of an ultra-precision fly-cutting machine tool and the machined surface verifies the effectiveness of this method. This research proposes a simplified method to study the IMPMT, the relationships between the machining process and the machine tool are established and the surface generation is obtained.     

Kinematic and Singularity Analyses of a Six DOF 6-3-3 Parallel Link Machine Tool

A parallel link manipulator is considered to be an important construction feature of machine tools in the future. To construct a parallel link machine tool which can be practically applied for machining, the analysis of singularity is essential. A six degrees-of-freedom 6-3-3 parallel link machine tool was considered to investigate the effects of the design parameters on the singularity of the system. The U matrix method, which is based on the Pluücker coordinate system, is adopted to investigate the singularity of the machine tool. The results show that a little variation of the orientation of the tool frame can effectively avoid the singular condition during the machining processes. This result is important for the applications of parallel link machine tools in real machining processes.     

Dynamic behavior analysis of drill-threading process when machining AISI Al-Si-Cu4 alloy

Conventional threading operations involve two distinct machining processes: drilling and threading. Therefore, it is time consuming for the tools must be changed and the workpiece has to be moved to another machine. This paper presents an analysis of the combined process (drilling followed by threading) using a single tool for both operations: the tap-milling tool. Before presenting the methodology used to evaluate this hybrid tool, the ODS (operating deflection shapes) basics is shortly described. ODS and finite element modeling (FEM) were used during this research to optimize the process aiming to achieve higher stable machining conditions and increasing the tool life. Both methods allowed the determination of the natural frequencies and displacements of the machining center and optimize the workpiece fixture system. The results showed that there is an excellent correlation between the dynamic stability of the machining center-tool holder and the tool life, avoiding a tool premature catastrophic failure. Nevertheless, evidence showed that the tool is very sensitive to work conditions. Undoubtedly, the use of ODS and FEM eliminate empiric decisions concerning the optimization of machining conditions and increase drastically the tool life. After the ODS and FEM studies, it was possible to optimize the process and work material fixture system and machine more than 30,000 threaded holes without reaching the tool life limit and catastrophic fail.     

基础装备制造及高档集成数控机床研究进展

为解决航空航天制造领域面临的关键问题以及提高机床行业的服务能力,机床行业提出建设航空航天制造领域高档数控机床创新能力平台。总结了创新平台的基础装备制造及高档数控机床的四个方面研究进展,包括电主轴单元技术（高速主轴刀柄刀具系统动力分析、数字化仿真和样机模态验证分析）、机床设计（直线轴进给系统刚柔耦合机电耦合动力学、多轴联动与高速五坐标混联加工装备、摆动/回转进给系统的机电耦合动力学模型验证分析、MTC1000镗铣磨复合加工中心结构创新设计）、机床控制（高速启停残留振动抑制技术验证分析）和机床验证（航空航天结构件高速加工现场的数据采集、映射与存储技术分析）。最后展望了基础装备制造和高档数控机床的发展方向。     

五轴数控机床加工误差动态修正方法研究

为修正五轴数控机床加工误差,提高五轴数控机床加工质量,提出一种新的五轴数控机床加工误差动态修正方法.构建五轴数控机床加工误差计算模型,获取五轴数控机床加工的刀心方位、刀轴方位轮廓误差;锁定误差方位后,通过五轴数控机床误差的动态实时补偿方法,实现五轴数控机床加工误差动态修正.研究结果表明:所提方法可实现全方位、高效率的五...     

车铣加工中心关键零部件动态性能研究

机床的动态性能直接关系到机床的加工性能,为了提高机床的加工精度及效率,必须要求机床整机具备优异的动态特性。基于ANSYS Workbench有限元分析软件,研究了CX110100立式车铣复合加工中心关键零部件的动态性能,运用Solid187单元进行网格划分,根据机床的工作实际加载边界条件,实现了加工中心主要零部件的模态分析和谐响应分析,保证了加工中心的设计要求,把有限元分析软件应用于车铣复合加工中心的设计中,对提高加工中心的设计质量具有重要意义。