一种可变式机床总体结构方案的设计方法

:以刀具和工件加工表面为输入信息 ,首先给出机床运动功能方案的创成式设计方法 ,然后以运动功能方案为基础 ,提出一种可变式机床总体结构方案的设计方法 ,并以片铣刀加工自由曲面为例加以介绍     

数控车床结构布局形态方案创成研究

研究了概念设计阶段机床结构布局形态方案的创成式设计方法。依据所建立的机床形状创成模型，通过解析方法创成出所有可能的机床运动功能方案，然后基于机床运动单元与结构单元之间的关系模型，由机床的运动功能方案创成出机床结构布局形态方案。通过数控车床结构布局形态方案创成，证明本创成式设计方法对概念设计阶段机床总体结构方案的创新性设计且有指导意义．     

钢坯试样铣磨床总体方案的创新设计

阐述了铣磨床总体方案的创新设计,针对钢坯检测试样高效率、高表面质量的加工要求,采用组合创新的方法,提出了在同一机床上实现铣削、磨削复合加工的工艺原理方案,并且机床的磨削加工采用了现代砂带磨削.通过分析机床的各种运动功能,设计了机床的运动方案.对于机床的总体结构布局,采用结构变异的方法,确定其为定梁龙门式框架结构.结果表明,通过总体方案的创新,实现了机床的独特性设计,所设计机床性能优良,很好地满足了钢坯检测试样的加工要求.     

数控机床总体方案的创新设计

本文首先从适应市场竞争对机床产品创新的需求,FMS对开发全新形式系统适应型机床的需求及并联原理数控机床应用等三个方面,讨论了机床总体设计方法需要变革的迫切性。同时介绍了一种新型机床运动功能方案设计方法,包括以刀具、工件信息为输入的机床运动方案创成式设计,基于基本运动功能方案的变异式设计,并联驱动置换设计。然后,从运动功能分配,结构布局设计,总体结构方案模型设计,总体方案概略尺寸设计,总体结构刚度及精度分配,总体结构方案综合评价等方面论述了数控机床总体结构方案设计方法。最后介绍了上述方法的应用实例。     

面向五轴数控机床的可视化方案设计

五轴数控机床是1种具有战略地位的加工设备,其功能和成本很大程度上决定于机床的方案设计.采用可视化设计的方法对五轴机床实施方案设计.在简要介绍方案设计和可视化设计概念的基础上,详细叙述了基于ADAMS的可视化方案设计流程,包括机床运动方案及结构布局的初步确定、针对各方案进行运动模拟和对选定的方案进一步参数化仿真等内容.最后,以开发某五轴加工中心为例,按照所提流程进行了可视化方案设计研究,提出了龙门式、立式等3种运动方案和布局,并在运动仿真及优缺点对比分析的基础上,选定龙门式结构为最终的设计方案.     

基于创成设计思想的可重构机床模块设置方法

建立合理的功能模块群是实现可重构机床方案重构的关键,基于创成设计方法建立了以镗铣加工为主的机床结构形态方案图谱,解决了机床模块划分时机床结构形态方案不足的问题。通过对机床结构形态方案的分析,划分出机床概念结构模块群;依据可重构机床模块功能自治原则,建立了机床概念功能模块群;将机床的概念功能模块、运动功能及被加工零件的工艺方案联系起来,建立了以工艺方案为依据的可重构机床功能模块群设置方法,并以某变速箱壳体件加工为例验证了该方法的可行性。     

一种可重构机床设计方法研究

从可重构机床的设计理念出发。通过构造可实现车、铣、镗、钻等切削功能的结构模块群，提出了一种可重构机床的数字化原型样机。给出了该可重构机床的实现方法。事例研究表明，提出的可重构机床方案可以通过其结构和功能的重构。实现不同特征和批量零件的加工。为可重构机床的设计和研究提供一条思路。     

基于NURBS的NC机床运动方案创成设计系统研究

本文在分析计算ＮＵＲＢＳ曲面单位法矢量的基础上,提出ＮＣ加工系统方案创成设计方法,采用平移、旋转和固定等概念模块,准确地表达ＮＣ机床运动模型,采用链表结构表达ＮＣ机床的运动设计方案,采用ａｇｅｎｔ技术实现方案的创新设计。     

一种可重构机床机械系统模块设计

根据可重构机床设计理念，通过对工件工艺特征进行辨认，制定、区分和组合出加工工序；利用旋量理论建立机床基本功能模块的运动学表达式，并在此基础上完成机床机械系统的运动功能模块建模；最后提出可重构机床样机的结构方案。     

基于NURBS的NC机床运动方案创新设计系统研究

本文在分析计算ＮＵＲＢＳ曲面单位法矢量的基础上,提出ＮＣ加工系统方案设计方法,采用平移、旋转和固定等概念模块,准确地表达ＮＣ机床运动模型,采用链表结构表达ＮＣ机床的运动设计方案,采用ａｇｅｎｔ技术实现方案的创新设计。     

Design and machining of the epicycloid planet gear of cycloid drives

This paper presents a mathematical model and design procedures to design the epicycloid planet gear of cycloid drives. It is based on coordinate transformation, envelope theory, and theories of conjugate surfaces, from which the equation of meshing is derived, while the path of machining tools is obtained by the equidistant curve principle. In addition, a program is developed to solve the equations of meshing and conjugate surfaces. Therefore, the epicycloid-profile is obtained. Then, these data are used to construct the 2D drawing and solid modeling of the epicycloid-planet-gear using AutoCAD and Pro/E (a CAD software package), respectively. The CAD data is used for machining, in this case by a wire-cutting machine. The manufactured component is presented to demonstrate that the design procedures and manufacturing are feasible. The design approach and machining method are suitable for applying CAD and CAM in industrial fields.     

Milling complex surfaces on a numerically controlled machine tool

A milling method for complex surfaces is proposed. In this method, surfaces of different form are machined by means of a single tool trajectory, defined by a single equation. The theoretical principles of the method are given, with examples of its use. This method expands the scope for machining complex surfaces on numerically controlled machine tools.     

数控落地铣镗床滑座的模态分析及优化

车床床身是整台机床的基础和支架,其振动和刚度影响着零件的加工精度。利用SolidWorks建模,并运用ANSYS Workbench进行数控落地铣镗床滑座的前6阶模态分析,得到滑座的固有频率、振型及动态特征;在保证车床静刚度的前提下,提出3种优化方案,对优化前后的模型进行对比分析,找出最优方案,为车床的设计提供新的思路和方法。     

CW6163C数控化改造

以普通卧式车床CW6163C数控化改造实例,论述利用机械系统设计的原则、方法、步骤进行数控改造方案的设计,并列举改造实施中可能出现的问题及其解决方法。数控化改造是提高机床数控化率的捷径和有效手段,机床数控化改造后,可显著提高自动化程度和加工精度,效率提高3～7倍,具有投资少、见效快等特点。     

自动机异形零件空间曲面精密加工工艺研究

火炮自动机中的关键零件一般具有型腔复杂,精度、硬度(洛氏硬度45HRC～50HRC)要求高的特点,属于高精度、高硬度难加工零件,特别是零件上的空间曲面槽更是机械加工的难题。以某火炮自动机中的关键件——滑板为典型实例,探索外形不规则、具有复杂型腔零件的高精度空间椭圆曲面槽加工工艺,从工艺流程、工艺装置和刀具设计以及具体操作方法几方面综合考虑,提出解决方案;该方案在三轴加工中心上利用辅助轴并配合工艺装置实现了零件高精度空间椭圆曲面槽的加工。该方案的实际应用效果良好,已在多个项目研制中得到推广应用。     

空间自由曲面五轴联动数控加工

介绍了五轴数控机床的运动方式,阐述了空间自由曲面五轴联动数控加工中刀具路径规划的基本方法:参数线法、CC路径截面线法、CL路径截面线法、导动面法等。之后对五轴加工中刀具轴向规划进行了论述:垂直于表面方式、平行于表面方式、倾斜于表面方式。最后归纳总结了刀具干涉的检测与处理的方法,并分别说明了其优缺点和适应范围。     

A manufacturing model of helical groove on rotary burr and a universal post processing method

A systematic machining theory and precision method to determine cutter location in a grinding system is presented for rotary burr. First, the helical cutting edge on various kinds of revolving surfaces is built. Then, based on the geometry model of the helical cutting edge, the smooth spiral rake surface with constant normal rake angle and flank surface can been formed during the one-pass grinding process by this method. No interference between the grinding wheel and workpiece happens by the wheel special rotation. The method has the characteristic of detaching the grinding wheel path solution from specified machining conditions. The grinding wheel path is suitable for different NC machine tools through post processing. Meanwhile, a mechanism kinematic model of the NC machine tool is built, and a generalized algorithm for post-processing of multi-axis NC machine tools is presented. This model is applied to arbitrary configuration of NC machine tool, and the motion value for each axis will be generated by the inputting structure and motion parameters of the machine tool. The model, together with the machining method mentioned in this paper, make the calculation and generation of the grinding wheel path simpler and universal. At last, the validity of the method given in the paper is identified by an example of grinding.     

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.