基于Matlab的数控加工代码仿真检验

为保证实际数控加工的顺利进行 ,需要采用仿真加工技术对数控加工代码的正确性进行检验。在研究数控加工代码仿真检验技术的基础上 ,开发了基于Matlab平台的数控工具磨床仿真加工系统 ,实现了复杂形状刀具数控磨削加工代码的仿真检验。     

变厚齿轮连续展成磨削数值模拟研究

加工仿真是验证加工方法和研究加工精度的重要手段,基于三维建模软件和专用软件的加工仿真存在实现复杂、仿真精度低等缺陷,针对变厚齿轮的连续展成磨削这一新工艺,在分析锥形蜗杆设计以及锥形蜗杆磨削变厚齿轮运动的基础上,建立了锥形蜗杆的数学模型,并且建立了锥形蜗杆磨削变厚齿轮的数字仿真模型。以某一变厚齿轮为例,将变厚齿轮理论模型与数字仿真模型进行对比,验证了所建立的仿真模型的准确性。所建立的锥形蜗杆加工变厚齿轮的数字仿真模型为变厚齿轮连续展成磨削精度的研究以及复杂修形变厚齿轮连续展成磨削精度方法的研究奠定了基础。     

数字化齿面磨削加工虚拟仿真研究

对数字化齿面的磨削展成加工开展虚拟仿真研究,开发了一个磨削加工虚拟仿真系统.数字化齿面磨削加工仿真实例证明了开发的虚拟加工系统的效果,也验证了数字化齿面展成理论和方法的正确性.     

磁性珩磨系统温度仿真及试验研究

在加工长不锈钢管过程中磁场发生器温升较大,超过绕组的允许温度,导致磁性珩磨加工受到限制。为保证加工的可持续性,本文提出了外循环水冷的冷却方法,并通过仿真分析最终得到该系统稳态温度分布云图。磨削试验结果表明:水冷方法可减小系统温升,提高系统的加工稳定性;磨削试验稳态温度与仿真稳态温度的误差在允许范围内,验证了仿真模型的可靠性。     

考虑硬度的高弹性合金钢3J33微细特征磨削仿真分析及实验研究

针对高弹性合金钢3J33的难加工性与实验复杂性问题,在其加工过程中进行了仿真模拟的研究。基于弹塑性力学、磨削加工机理和有限元分析等理论,利用专业金属切削仿真软件AdvantEdge,构建了考虑硬度的单颗磨粒磨削细筋的残余应力仿真模型,对不同硬度下磨削时的细筋残余应力进行了仿真分析和对比,并通过实验加以论证,最终验证了优化后的仿真模型具有可靠性。     

基于磨削热变形分析的切入式外圆磨削去除率的修正模型与实验研究

为解决切入式外圆磨削加工中磨削热变形引起的传统磨削去除率模型与实际磨削偏差较大的问题，基于磨削热变形机理分析，对传统切入式外圆磨削去除率模型进行了修正。通过分析切入式外圆磨削过程中砂轮与工件的磨削热变形量及热变形速率，确定了修正函数，建立了基于磨削热变形的切入式外圆磨削材料去除率修正模型，并通过磨削实验对模型进行了验证。结果表明，修正模型具有更高的准确性。     

基于OpenGL的数控磨削麻花钻仿真系统研究

在视窗操作系统中,以VC++6.0软件为开发平台,基于OpenGL、三维模型和数学模型建立了数控磨削麻花钻仿真系统,通过数控代码编译、布尔运算、双缓存技术等实现了磨削加工螺旋槽的三维动态仿真显示。     

柱面微透镜阵列的精密磨削

柱面微透镜阵列的加工精度要求高,加工效率低,采用具有微细轮廓结构的成形砂轮进行磨削加工能够极大地提高加工效率。为了预测成形砂轮磨削工件的面形误差和表面粗糙度,建立了成形砂轮磨削仿真模型。通过滤波方法分析和模拟微细结构成形砂轮的磨粒突出高度的偏态分布特征,结合实测的砂轮的轮廓形状和跳动完成了整体的空间砂轮的重构,同时建立了砂轮表面磨粒的磨削运动学模型,模拟出工件磨削加工后的表面形貌。最后,开展磨削实验验证了仿真模型的有效性。对比仿真与实验结果可知,面形误差PV值的偏差为5.78%,Ra值的偏差为17.3%,Rz值的偏差为12.9%。该磨削仿真模型能有效预测磨削表面的面形误差和表面粗糙度。     

复杂母线旋转体工件磨削加工的插补模型及算法研究

复杂母线旋转体工件磨削加工是数控磨削加工研究的热点之一。因此,利用圆弧样条插补和圆弧插补相结合的方法,建立复杂母线旋转体工件磨削加工的插补模型和求解算法,设计复杂母线旋转体工件磨削加工的插补方案,分析其加工误差。实例仿真研究验证了插补模型和算法的合理性与可行性。     

圆柱立铣刀磨削加工刀轨计算研究

基于立铣刀的几何参数推导建立整体硬质合金立铣刀的磨削加工刀轨计算模型,实现铣刀的螺旋槽,周刃第一、二后角以及底刃第一、二后角的成形磨削。并以三刃立铣刀为实例,通过仿真模拟加工验证了该理论方法的正确性,为立铣刀成形磨削提供了一种理论方法和依据。     

基于ACIS的非圆曲面内圆数控磨削方法的研究

介绍了处理基于ACIS实体造型的任意非圆曲面内圆磨削的新策略和新算法。针对某型数控磨床的改造要求,提出了基于ACIS几何造型的算法和实现步骤,为数控仿真和后置处理等步骤提供了依据。     

装配建模中基于属性机制的永久对象标识方法

在CAD造型系统装配模块进行特征建模过程中,为满足特征重建（特别是保存后的重建工作）,必须能够在装配环境下建立永久对象的标识。文中．研究了装配过程中各相关特征之间的引用关系,提出了在装配环境中建立永久对象标识和进行标识管理的实现方法,它利用了几何核心的属性继承机制保持了标识的唯一性和恒定性。实现了装配特征的保存、打开并恢复、创建和编辑等操作。在基于ACIS几何核心的原型系统中利用属性继承建立标识,进行初步验证．方法可行有效。     

A simulation platform for optimal selection of robotic belt grinding system parameters

Robotic belt grinding is an effective process for removing material from geometrically complex workpieces. However, due to the relatively low stiffness of the system, the grinding quality is prone to inaccuracies caused by system dynamics. In order to control the quality of the grinding process, a profound understanding of the system is required. This paper presents a platform for comprehensive modeling and simulation of the robotic belt grinding system. The system kinematics model is based on the CAD model of the workpiece in composition with robot kinematics. The dynamics model is a comprehensive combination of the dynamics of the robot, the grinder, and the interaction between the grinder and the workpiece. A material removal model of the grinding process, which can adapt to workpieces with complicated shapes, is also developed and presented. The system simulation shows that optimal selection of key control parameters of the grinder and proper selection of robot control strategies can efficiently suppress chatter in the grinding process. Furthermore, having the ability to predict material removal rate, the comprehensive simulation platform is also demonstrated to be a strong tool in selecting the grinding process key parameters, namely, robotic velocity and contact force, for the control of material removal to meet dimensional accuracy requirements on workpieces.     

概念设计自动化软件DARFAD与其它系统的集成工具

STEP是国际标准化组织制定的产品数据表达与交换标准。DARFAD是以ACIS为平台开发的概念设计自动化工具。本文在DARFAD系统上完成了由STEP中性文件信息描述到ACIS系统数据的映射,实现了DAR-FAD与其它系统的集成。     

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。     

Kinematic simulation of the uncut chip thickness and surface finish using a reduced set of 3D grinding wheel measurements

This paper combined experimentally-measured grinding wheel topography data taken around the entire circumference of the grinding wheel with a kinematic simulation of the grinding process. Several new methods were developed in order to create the resulting high-fidelity and computationally-efficient simulation. First a novel peak-removal technique was developed and applied to effectively remove erroneous peaks in the raw wheel topography data. Next a method was found to determine only the active cutting points on the wheel model by considering the kinematics of the grinding process. This new approach was able to reduce the simulation time from over twelve hours to about four seconds without losing any information about the cutting edge–workpiece interaction. The resulting predicted workpiece surface was then experimentally validated by carrying out a grinding experiment using the same grinding wheel used to develop the grinding wheel computer model and then measuring the resulting workpiece surface profile. Good agreement between simulated and experimental workpiece profiles was observed. Finally, the validated simulator was used to develop a kinematically-exact method to calculate the maximum uncut chip thickness and the simulation results were investigated for different depths of cut, wheel speeds and workpiece feeds.     

Modelling and simulation of an automatic grinding system using a hand grinder

A grinding process model for an automatic grinding system with grinding force control is developed in this paper. This grinding system utilises an electric hand grinder, driven by a CNC machine centre and a force sensor for force measurement. This model includes compliance of the grinding system and is initially represented by a series of springs. The stiffness of each component is estimated in this study and it is found that the model may be simplified into a single spring-mass system. A corresponding PID controller is designed for the purpose of grinding force control, which calculates the appropriate CNC spindle displacement according to the force measured by the force sensor. Computer simulation results show that the system settling time is less than 0.25 s.     

基于OpenGL无心外圆磨削仿真系统的研究

无心磨削是一种精密、高效的加工方法,在机械制造领域占有重要地位,以切入式外圆无心磨削为研究对象,介绍了仿真系统中各功能模块,对系统开发过程中所使用到的技术要点进行探讨,并对3DS模型在仿真系统中的读取与重现进行了分析,采用OpenGL技术实现了无心外圆磨削加工过程的仿真系统,提出了根据工件中心高的理论优化值计算托板高度的方法,在时域中对工件真圆度和磨削力进行了仿真,为进一步研究无心磨削的动态特性和提高磨削加工精度提供了依据。     

Simulation of elliptical patterns based on grinding with wheel dressed by elliptical tool

Dressing is a sharpening operation aimed to produce a specific groove shape on the active surface of the wheel. The preparation of grinding tools in special way is the most important enabling factor in the grinding process. It greatly influences the subsequent geometry of the workpiece. As the groove shape of the wheel surface determines the shape of the surface patterns, therefore, it is essential to produce desired groove on the wheel cutting surface before grinding. Therefore, an elliptical groove surface pattern model is proposed based on grinding with dressed wheel. An elliptical tip tool is used for the dressing process to make grooves on the wheel instead of sharp tip tool or rounded tip tool in the previous work. The dressing tool passes helically over the surface of the grinding wheel for making grooves. After that, the grooved wheel passes over the flat surface to generate elliptical patterns. The results showed the three-dimensional geometry of the surface patterns with elliptical groove which are uniformly distributed on the workpiece. An experiment is carried out for the verification of the simulation results and it is revealed that the simulation results agreed well with the experiment.