等高齿弧齿锥齿轮切削模拟仿真

依据等高齿弧齿锥齿轮啮合原理与加工方法获得切削轨迹方程,建立刀盘、刀条及齿坯的三维模型,通过Advant Edge软件进行等高齿弧齿锥齿轮的切削模拟仿真,得到不同切削参数下的切削力和切削温度,获取较合理的切削参数。根据切削模拟仿真进行了切削试验,对齿轮精度进行了检测。     

基于UG的弧齿锥齿轮建模新方法的研究

介绍了一种基于UG的接触区主动控制的弧齿锥齿轮建模方法。首先使用成形法得到大轮；然后采用变异的铣刀盘成形加工得到变异大轮，再依据共轭原理，利用变异大轮展成小轮毛坯实体得到小轮齿面。按照此方法基于UG软件实现了一对21—35齿的弧齿锥齿轮副的建模。该方法基于传统的格里森弧齿锥齿轮加工方法，有创新之处，是格里森弧齿锥齿轮建模和加工的一种实用的新方法。     

弧齿锥齿轮协同设计系统建模的研究与实现

针对弧齿锥齿轮及网络化协同设计与制造领域的先进思想与方法,构建了基于Web Services的弧齿锥齿轮齿面协同设计系统的基本模型。首先,以弧齿锥齿轮中主流的仿真加工建模为手段设计了通用的弧齿锥齿轮齿面设计的全生命周期流程。然后,基于该流程提出了实现协同的多种关键技术,如协同仿真技术、优化设计技术和相关的支撑系统如信息集成系统、设计监控系统、零件库系统。最后,搭建了弧齿锥齿轮齿面协同设计系统集成平台的基本框架,以此实现高效、高精度、高柔性化的弧齿锥齿轮的协同设计。     

在万能工具磨床上刃磨弧齿锥齿轮铣刀

随着弧齿锥齿轮在汽车、飞机、军工等行业的广泛应用,弧齿锥齿轮铣刀的用量日益增多,同其它齿轮刀具一样,弧齿锥齿轮铣刀在切削过程中,由于切削刃逐渐被磨损变钝,也需及时正确地修磨刀齿前刀面,因此,弧齿锥齿轮铣刀的刃磨工艺也引进了广泛关注.     

弧齿锥齿轮高速干切削数据库的设计与开发

弧齿锥齿轮具有设计加工参数复杂的特点,在对弧齿锥齿轮高速干切削技术参数进行搜集和评价的基础上,基于Microsoft SQL Server 2008数据库开发平台建立了弧齿锥齿轮高速干切削机床、刀具、夹具、工件、加工参数的数据库,利用Visual Basic 6.0开发了应用程序,并实现了数据库的查询、添加、修改、删除等基本操作功能。使用该数据库系统,可快速获取弧齿锥齿轮加工所需的各项技术参数,对提高切削效率和加工质量,降低加工成本起到很大的促进作用。     

小模数弧齿锥齿轮的高速干切削技术及加工试验研究

传统的小模数弧齿锥齿轮铣齿加工需要使用大量切削液,不仅会造成环境污染,还增加了生产成本;新型高速干切削工艺不使用切削液,减少了环境污染,且可提高生产效率.基于斜角切削理论,将斜角切削等效平面法与弧齿锥齿轮加工理论相结合,研究了小模数弧齿锥齿轮高速干切削工艺.针对小模数孤齿锥齿轮的高速干切削工艺特点,建立斜角切削热力耦合模型,利用Abaqus有限元软件,仿真分析了不同工艺条件对切削力的影响.选取硬质合金作为刀具材料,讨论了小模数弧齿锥齿轮的高速干切削工艺过程,并通过加工试验验证了该工艺的可行性.研究为该工艺的实施提供了参考依据.     

基于层片分割算法弧齿锥齿轮及准双面齿轮五轴数控切削仿真

针对目前的弧齿锥齿轮及准双面齿轮切削仿真系统独立性差、仿真速度慢、精度低等问题,提出了层片分割算法,以该算法为核心开发出了五轴数控弧齿锥齿轮及准双面齿轮仿真系统.介绍了层片分割仿真核心算法实现的原理和弧齿锥齿轮及准双面齿轮仿真系统的整体结构、各个模块的作用以及实现的流程,给出了仿真实例.     

在平面磨床上刃磨硬质合金弧齿锥齿轮铣刀头的角度计算

<正> 用硬质合金弧齿锥齿轮铣刀(以下简称硬质合金弧铣刀)刮削加工淬硬齿面的弧齿锥齿轮,是近几年发展起来的一项新工艺。采用该新工艺,可以修正热处理变形,提高弧齿锥齿轮的加工精度,起到了代替磨齿或代替精磨前的粗磨作用,有着显著的经济效益。由于硬质合金脆性大,抗冲击性能差,为了提高刃口强度和改善切削条件(形成斜角切削),便质合金弧铣刀采用了法向负前角和负     

时序数据的随机子空间模型辨识和一步预测

时序数据是指按先后顺序排列的一组随机数据。在系统辨识中,一组时序数据对应于随机子空间模型的输出响应。本文依照工程实际,用随机子空间辨识技术来解决时序数据的参数化建模和预测问题,提出了用改进的Positive算法进行参数识别和一步预测,来替代原有的AR参数化建模和预测技术。最后通过一组丝杆误差时序数据,对算法作了仿真和验证。     

双圆弧弧齿锥齿轮的实体建模方法及加工过程模拟

以双圆弧弧齿锥齿轮的加工原理为基础，借助绘图软件AutoCAD这一工具，进行了双圆弧弧齿锥齿轮的实体建模及加工过程模拟。     

实际加工过程的弧齿锥齿轮实体建模

在实际加工空间中建立机床与弧齿锥齿轮的几何模型,将刀刃切削面网格化并扩展,将连续的加工过程离散化。应用Matlab软件仿真齿面的加工过程,比较前后两次切削面后由记录的点构成保留面,由最终保留面的点的坐标在UG软件中生成齿面。用相同的方法获得另一齿面后,利用UG的建模功能得到轮齿和齿轮的实体模型。     

摆线齿锥齿轮铣齿机的运动及加工仿真研究

通过分析机械式摆线齿锥齿轮铣齿机的传动系统结构,推导了摆线齿锥齿轮加工时刀盘、摇台、产形轮及工件之间的相对运动关系,进而总结出摆线齿锥齿轮铣齿机各部分运动控制的一般规律;运用这一规律,在VERICUT数控加工仿真软件构建了摆线齿锥齿轮的加工仿真平台,实现了某摆线齿锥齿轮副小轮的加工仿真。     

Depth of cut models for multipass abrasive waterjet cutting of alumina ceramics with nozzle oscillation

An experimental study of the depth of cut in multipass abrasive waterjet (AWJ) cutting of alumina ceramics with controlled nozzle oscillation is presented. It is found that this cutting technique can significantly increase the depth of cut by an average of 50.8% as compared to single pass cutting without nozzle oscillation under the corresponding cutting conditions and within the same cutting time. Predictive models for the depth of cut are then developed. The modelling process starts with single pass cutting using a dimensional analysis technique and the particle erosion theories applied to alumina ceramics, before progressing to the development of the models for multipass cutting. The models are finally assessed both qualitatively and quantitatively with experimental data. It is shown that the model predictions are in good agreement with the experimental data with the average deviations of about 1%.     

Depth of cut models for multipass abrasive waterjet cutting of alumina ceramics with nozzle oscillation

An experimental study of the depth of cut in multipass abrasive waterjet (AWJ) cutting of alumina ceramics with controlled nozzle oscillation is presented. It is found that this cutting technique can significantly increase the depth of cut by an average of 50.8% as compared to single pass cutting without nozzle oscillation under the corresponding cutting conditions and within the same cutting time. Predictive models for the depth of cut are then developed. The modelling process starts with single pass cutting using a dimensional analysis technique and the particle erosion theories applied to alumina ceramics, before progressing to the development of the models for multipass cutting. The models are finally assessed both qualitatively and quantitatively with experimental data. It is shown that the model predictions are in good agreement with the experimental data with the average deviations of about 1%.     

An adaptive parameter optimization model and system for sustainable gear dry hobbing in batch production

Gear hobbing technology is one of the most widely used forming processes of gear teeth. And the development of dry hobbing technology provides a solution for realizing productive, economical, and ecological gear production. Since there is no cutting oil for cooling and lubrication in dry hobbing process, the hob tool life, thermal deformation errors of machine tool, and quality of workpiece are sensitive to the cutting parameters, especially the cutting speed and tip chip thickness. Considering this situation, a dry hobbing parameters optimization model with the hobbing efficiency as our objective, and the hobbing cost per piece, gear quality, tact time as constraints was established, in which the cutting speed and tip chip thickness were considered as optimal variables and the material of workpiece, coating of hob, and feed rate were considered comprehensively. An iterative test method is proposed to solve this model. And for the application in automated production line, an online adaptive application system was also developed based on SINUMERIK 840D NC system. The parameters of five different kinds of material gear were optimized by applying this model and system, and the result showed the model and the system were practical.

     

Research on the design and manufacturing of an outer cycloid slotting cutter

Outer cycloid gears are used widely in many instruments and machines. The outer cycloid slotting cutter is an important cutting tool used in the manufacturing of this type of gear. In the process of design, the ideal outer cycloid cutter is one where a cylindrical surface takes the tooth profile of the outer cycloid as the directrix. However, during the manufacturing process, it is used as a cutter and therefore a cutting edge is required. As a result, it will be seen that the processes of design and usage of the outer cycloid cutter are not the same. The range of the qualified length of tooth is deduced in this paper by using the mid-point and mid-line method. This paper also presents the associated outer cycloid slotting cutter design and manufacturing models so that the modelling accuracy and the necessary relief angles of the top cutting edge and side cutting edge can be ensured. This paper is intended as a reference to be used in the manufacture and application of this type of slotting cutter.     

On the finite element modelling of high speed hard turning

The results reported in this paper pertain to the simulation of high speed hard turning when using the finite element method. In recent years high speed hard turning has emerged as a very advantageous machining process for cutting hardened steels. Among the advantages of this modern turning operation are final product quality, reduced machining time, lower cost and environmentally friendly characteristics. For the finite element modelling a commercial programme, namely the Third Wave Systems AdvantEdge, was used. This programme is specially designed for simulating cutting operations, offering to the user many designing and analysis tools. In the present analysis orthogonal cutting models are proposed, taking several processing parameters into account; the models are validated with experimental results from the relevant literature and discussed. Additionally, oblique cutting models of high speed hard turning are constructed and discussed. From the reported results useful conclusions may be drawn and it can be stated that the proposed models can be used for industrial application.     

Research of production times and cutting of the spur gears by end mill in CNC milling machine

In the current study, differently from the conventional manufacturing methods, cutting of spur gear by the end mill in the computer numerically controlled (CNC) vertical milling machine was purposed. For this aim, two different approaches, radial and axial cutting methods, were introduced. However, the cutting process is performed by use of only the radial cutting method. Parametric equations of tool paths for cutting the spur gear were derived. Regarding those equations, by using the macro-program of the Dyna 2009 Myte type CNC milling machine, a CAM program is developed. By varying the parameters in the tool paths such as module, number of teeth, face width of the spur gear, cutting depth, and cutting angle, spur gear was cut and the production time was obtained. Furthermore, the dimensions of new manufactured spur gear were measured by gear tooth vernies. The dimensions were also calculated by using mathematical expressions and it was concluded that the measured values are well agreeable with the calculated values. It was observed that the production time increases with increasing the module value or number of teeth and decreasing the cutting angle or the cutting depth.     

内齿轮滚刀的几何特征

研究内齿轮滚刀、媒介齿轮的共轭啮合及其坐标变换关系，推导出内齿轮滚刀螺旋面方程式，根切曲线方程式，零前角直槽内齿轮滚刀切削刃方程式，通过电算分析，证明内齿轮滚刀切削刃具有关于基准轴的对称性，沿媒介齿轮节圆的分布均匀性，对渐开线的可拟合性等几何特征。     

基于Pro/E的斜齿轮三维造型技术研究

介绍在Pro/E环境下实现斜齿轮造型的通用方法--扫描成型法.该方法应用Pro/E生成端面和法面齿廓线,并沿螺旋线扫描生成斜齿轮轮廓面.通过裁剪扫描体得到单个轮齿,然后通过阵列生成全部轮齿,最后利用PROGRAM实现斜齿轮自动化设计.