用于直接驱动机床主轴的大推力圆筒型永磁直线电机的研究

根据机床主轴进给性能指标的要求,计算圆筒型永磁直线电机的主要尺寸参数,然后通过有限元分析对电机的输出性能进行优化。最后设计基于各相独立电流环控制的控制方案,完成机床主轴直线电机进给系统的总体设计。设计的大推力圆筒型永磁直线电机能实现机床主轴的直接进给驱动,具有效率高,精度高,动态响应快等优点。     

无机械传动链高效并联机床传动模式的研究

针对现代数控机床向精密、高效发展的趋势，分析了并联机床驱动和传动的现状，提出把直线步进电机和电主轴等驱动技术引入并联机床，使并联机床在无机械传动链条件下实现精确进给和高效加工。阐述了直线步进电机的驱动特点和选型原则，给出无机械传动链高效并联机床的基本传动模式。     

圆筒型永磁同步直线电机驱动的新型伺服压力机

提出了一种圆筒型永磁同步直线电机驱动的新型伺服压力机,采用肘杆增力机构解决了直线电机输出力不足的问题,进而扩大了直线电机式伺服压力机的公称压力.该种方式实现了采用小功率的伺服电机以获得较大吨位输出力的目的.此外,基于分散多动力思想,将圆筒型永磁同步直线电机与肘杆增力机构组成的单套动力源进行并联式机械组合,可形成2套、3...     

直线电机驱动的冲压机床设计与研究

直线电机驱动的冲压机床可以实现"零传动",其结构简单,控制精度高,噪声小,是精密数控冲压机床的重要发展方向。通过对比分析,确定圆筒型直线电机作为冲压机床的动力源,并设计出机床的动力系统、缓冲机构等主要零部件;在此基础上,利用ADAMS软件对冲压过程进行仿真,得到了冲裁力仿真曲线,冲裁力为53 kN左右,满足设计要求;利用HyperMesh有限元软件分析了模架的刚度及床身的约束模态,通过求解计算分析,模架最大变形位置在下端面,为1.689×10~(-3)mm,床身最小固有频率为125.7 Hz,结果均满足机床使用要求。     

直线电机驱动的冲压机床设计与研究北大核心

直线电机驱动的冲压机床可以实现"零传动",其结构简单,控制精度高,噪声小,是精密数控冲压机床的重要发展方向。通过对比分析,确定圆筒型直线电机作为冲压机床的动力源,并设计出机床的动力系统、缓冲机构等主要零部件;在此基础上,利用ADAMS软件对冲压过程进行仿真,得到了冲裁力仿真曲线,冲裁力为53 kN左右,满足设计要求;利用HyperMesh有限元软件分析了模架的刚度及床身的约束模态,通过求解计算分析,模架最大变形位置在下端面,为1.689×10^(-3)mm,床身最小固有频率为125.7 Hz,结果均满足机床使用要求。     

直线电机驱动的冲压机床设计与研究

直线电机驱动的冲压机床可以实现“零传动”，其结构简单，控制精度高，噪声小，是精密数控冲压机床的重要发展方向。通过对比分析，确定圆筒型直线电机作为冲压机床的动力源，并设计出机床的动力系统、缓冲机构等主要零部件；在此基础上，利用ADAMS软件对冲压过程进行仿真，得到了冲裁力仿真曲线，冲裁力为53 kN左右，满足设计要求；利用HyperMesh有限元软件分析了模架的刚度及床身的约束模态，通过求解计算分析，模架最大变形位置在下端面，为1689×10-3 mm，床身最小固有频率为1257 Hz，结果均满足机床使用要求。     

高速机床进给系统的发展趋势

在明确了高速加工对机床进给进给系统要求的基础上，比较和分析了滚珠丝杠、直线电机和并联虚拟轴机构等三种高速进给系统的性能、特点、存在问题及其解决办法，指出了它们各自的适用范围和应用前景。     

高性能直驱混联数控机床静刚度分析

基于模块化设计技术,开发了一种由直线电机驱动的高性能混联数控机床,主要由2-DOF并联主轴头和XY工作台两大功能模块组成。以该机床并联主轴模块为研究对象,基于边界元和刚度矩阵组集方法,建立了机床静刚度模型,并编制了刚度计算软件,由此计算得到机床主轴在整个工作空间内位置刚度和旋转刚度的分布。数值仿真表明:该机床具有较好的刚度特性,满足轻切削加工静刚度设计要求。     

直线型超声电机在机床进给系统中的应用

文章简要比较了直线电机驱动和传统滚珠丝杠机床进给驱动的优缺点及直线电磁电机存在的问题;详细介绍了直线超声电机的运动机理,直线型超声电机相对于电磁式直线电机的优点和直线型超声电机的国内外发展和研究现状;并综述了直线型超声电机在机床进给系统中的应用研究现状.     

国外直线电机在机床上的应用前景

直线电机传动装置由于结构简单，将直线位移的传动元件和执行元件相结合，具有显著高的技术特性，故在高速加工机床上应用愈来愈广泛。本文就直线电机的分类、特点和国外在各种机床上的应用作一介绍，以供参考。一、直线电机的分类和特点按能量转换定理，进给机构的直线电机可分为同步电机和异步电机，而按结构可分为无罩壳电机和封闭式电机（带伸出杆）。根据对单位动力指标的要求，直线电机可有气冷系统和液冷系统。无罩壳同步直线电机是由初级模块和次级模块所组成。初级模块有三相绕组，其尺寸固定且与电机的型式有关，安装在机床的活动…     

Servo design of a vertical axis drive using dual linear motors for high speed electric discharge machining

This paper proposes a synchronous control scheme for a linear servo system applied to the vertical axis drive of a die-sinking electric discharge machine (EDM) tool. The investigated vertical axis drive is constructed with dual parallel linear motors, which are arranged to jointly drive the feed axis for improvement of the overall thrust and structural stiffness. A pneumatic cylinder is employed to compensate the gravitational effect of the feed axis with its electrode and holder. A mechanical coupling is designed to firmly bridge the two linear motors and carry the feed axis. Therefore, synchronous control for the motors is critical for not only position accuracy, but also machine safety. Moreover, by controlling the thrust outputs and positions of the motors to be as equal as possible, the potential “pull and drag” effect between the motors can be reduced and loads can also be equally shared. The proposed “position/thrust hybrid synchronous control” scheme is applied to the EDM to achieve high-speed, accurate machining, and the experimental results show that the synchronization error between the two parallel motors and the positioning accuracy are both satisfactory when operated under high-speed conditions.     

Kinematic and dynamic synthesis of a parallel kinematic high speed drilling machine

Typically, the term “high speed drilling” is related to spindle capability of high cutting speeds. The suggested high speed drilling machine (HSDM) extends this term to include very fast and accurate point-to-point motions. The new HSDM is composed of a planar parallel mechanism with two linear motors as the inputs. The paper is focused on the kinematic and dynamic synthesis of this parallel kinematic machine (PKM). The kinematic synthesis introduces a new methodology of input motion planning for ideal drilling operation and accurate point-to-point positioning. The dynamic synthesis aims at reducing the input power of the PKM using a spring element.     

直线电机在机床工业中的最新应用及技术分析

直线电机在机床进给驱动上的应用日益广泛，比起传统的进给驱动方式，它能提供非常高的速度、加速度和位置精度，大大提高了生产率和加工件表面质量。文章介绍了直线电机在机床上的最新应用情况，并就应用中的关键技术问题进行了分析。     

卧式数控旋压机床用多工序自动旋轮库的研制

根据大型筒形件成形时多工序加工要求和旋压机床的结构特点,设计了一种卧式数控旋压机床用多工序自动旋轮库,重点介绍了自动旋轮更换装置的设计、旋压力的计算、旋轮头轴承配置、旋轮座结构以及直线导轨副的选择.该旋轮库采用了旋轮头与旋轮座分离的更换装置及由基座、纵向滑架与纵向横向滑架组成的旋轮座,可实现筒形件加工所需要的多道次拉深旋压、变薄旋压、切边、卷边等4工序成形所需旋轮、翻边轮及切边轮的自动装卡,极大地提高了生产效率、设备的利用率和自动化程度,从而降低了生产成本、减轻了工人的劳动强度.     

Thermal behavior of a machine tool equipped with linear motors

Development of a feed drive system with high speed and accuracy has been a major issue in the machine tool industry. Linear motors can be used as efficient tool to achieve the high speed and accuracy. However, a high speed feed drive system with linear motors, in turn, can generate heat problems. Also, frictional heat is produced at the ball or roller bearing of LM block when driven at high speed. It can affect the thermal deformation of the linear scale as well as that of the machine tool structure.In this paper, important heat sources and resulting thermal errors in a machine tool equipped with linear motors were investigated when it was operated at high speed. The thermal deformation characteristics were identified through measuring the thermal error caused from thermal deformation of the linear scale and the machine tool structure. The dominant thermal error components were identified from the thermal error analysis using finite element method. It was shown that the proposed analysis scheme is efficient in identifying the dominant thermal error components and its magnitudes such as the thermal expansion and movement of the linear scale, thermal deformation of the machine tool slide.     

High speed servo control of multi-axis machine tools

Advances in high-speed machining technology, including those in spindle speeds and cutters, are out-pacing advances in the servo control performance of machine tools. To close this gap, new machine tools and improved controls must be developed. Improvements to machine tools under development include special-purpose machine tools, the use of advanced materials, the replacement of ball screws and ways with linear motors and roller guides, and the use of parallel link actuators. This paper focuses on the control issues that will become increasingly important as these high-speed machining and high-speed machine tool advances are realized.The main issues in high-speed servo control are feed rate planning, and servo loop control laws. A method is developed in this paper which takes advantage of the full performance envelope of each axis in an arbitrary path. This near-complete usage of the servo capabilities of a machine tool results in reduced cycle time or reduced path error. A servo loop control law is then developed that uses the axis performance envelope as well as instantaneous position, velocity, and acceleration information of the target path and machine axis to improve servo performance in the presence of disturbances.     

零传动数控滚齿机的精度分析

零传动数控滚齿机去掉了传动用的高精度齿轮副、蜗轮蜗杆副等机械传动元件，其刀具轴和工件轴直接与电机轴连接。本文从滚齿机机床误差和滚齿加工误差等方面对零传动数控滚齿机进行了详细的精度分析，并针对加上过程中可能影响齿轮精度的因素给出相应的措施。