GibbsCAM软件编程在车铣复合加工中的应用

从GibbsCAM编程软件在车铣复合加工中心上的应用出发,分析了GibbsCAM软件的一些功能和实际生产中的应用技巧.     

手工编程和GibbsCAM软件编程在复合加工中的应用

根据目前复合加工技术现状,举例讲解手工宏程序编制方式和GibbsCAM软件编程方式的应用。其中软件编程极大地简化了编程难度,提高了制造效率。     

GibbsCAM软件中叶片的车铣复合加工

介绍使用GibbsCAM软件编制多轴车铣复合加工叶片程序的方法,实现从简单的车削到3轴铣以及高级的4轴联动铣削加工.     

VoluMill ACTC模块在动态高速铣削加工中的应用

通过对比研究运用传统平面铣模块生成的刀具路径以及运用VoluMill ACTC模块算法生成的动态高速铣削刀具路径,发现运用VoluMill ACTC模块算法能极大地提高工件加工效率,延长刀具使用寿命。     

基于GibbsCAM的计算机编程与手工编程方式比较及效益分析

以GibbsCAM软件编程为依据,详细对比了计算机编程与手工编程的优缺点,并通过加工实例分析了两种编程在加工中的时间效益。     

GibbsCAM在多任务机床中的应用

随着产品设计结构的复杂化,产品质量要求的精密化,交付进度的及时化,要求数控技术也要朝着高速度、高精度、复合化、网络化等方向发展。机械加工领域的发展趋势就是让那些复杂的零件加工更加高效,这也促使多任务机床的应用越来越广泛。本文通过描述数控加工现状及GibbsCAM软件的特点,结合GibbsCAM在多任务机床编程中的技巧,论述了GibbsCAM软件在提高多任务机床加工效率、挖掘数控机床潜能方面的作用。     

基于两级神经网络分析的切削力与切削功率的研究

基于多层神经网络原理,建立了切削深度、进给量和刀具耐用度为输入,以切削速度为输出的第一级神经网络.构造了切削深度和进给量和切削速度为输入,切削力与切削功率为输出的第二级神经网络.获得满足刀具耐用度条件下的切削速度、切削力和切削功率的插值计算模型建立方法.摆脱了传统经验公式的拟合计算的缺陷.为实现系统在线监测分析提供条件.     

GibbsCAM在高端车铣复合加工中心的应用

在多种复合加工领域中,车铣复合加工是目前发展最完善的一个领域。而使用车铣复合加工设备需要有一款好的CAM软件环境的支持,GibbsCAM软件是比较理想的选择。     

铣削加工中切削参数对切削力的影响

切削力是影响零件加工质量和刀具使用寿命的重要因素,而切削力的大小又是和切削参数息息相关的,因此,研究铣削加工中切削参数各因素(切宽、切深和每齿进给量)对切削力的影响有着非常重要的意义.文中通过设计一系列的切削实验,对铣削加工过程中,影响切削力的切削参数各因素进行了分析,从而得出其中的普遍性规律,为铣削加工中切削参数的选...     

基于正交切削模型的铣削加工有限元仿真

以铲齿成形铣刀的使用寿命为优化目标,对刀具的几何角度、切削用量进行模拟研究。建立正交铣削加工模型来模拟仿真铣削过程,并对切削加工过程中所得到的一些基本物理量进行分析和讨论。从理论深度上把握切削加工的状态,为建立合适的加工工艺策略提供理论和技术上的支持。     

Analysis of Cutting Force by End Milling Using Artificial ntelligence

The cutting forces during end milling process by using Genetic Algorithm are investigated in this paper. However, automated CNC （computer numerical control） programming by milling machine is intended to use for special required conditions of programming of tool path length, and analysis of cutting force and optimization of main parameters are presented. Some effective simplification of automated programming is done for cutting force. The cutting force is modelled and analyzed into mathematical simulations in order to optimize the main cutting parameters, also in this case tool path length, it is get as free trajectory. Optimization is carried out by using the Matlab/Genetic Algorithm method that excessively reduce the time and to optimize the main cutting parameters of machining. The number of experiments, measurements and results of cutting force （F~）, are presented in 3D as well as in tables. In order to verify the accuracy of the 3 D simulation with optimization method, the results are compared in experimental and theoretical way. In other word, these results indicate directly that the optimized parameters are capable of machining the workpiece. Achieved results that are presented in this paper may in general help the new researcher as well as manufacturing industries of metal cutting.     

Determining the cutting conditions for sculptured surface machining

This paper deals with a new method for determining cutting conditions for the machining of 3D sculptured surface shapes with a ball endmill. Since the interaction area between workpiece and cutting tool changes during ball endmill machining, the cutting conditions have to be changed accordingly. To determine the spindle speed, the tool-workpiece contact area is obtained from the depth of cut, path interval, and cutter contact (CC) data. The spindle speed is determined so that the tangential cutting speed of the centroid of the tool-workpiece contact area becomes the value suggested in the machining data handbook. The feedrate is determined so that the material removal rate is maximised within the range of the cutting-force constraint. The practical feasibility of the proposed scheme has been verified through experiments performed on a workpiece with sculptured surfaces. The test result shows that the new method can be used to increase the tool life, and improve the production rate.     

Fuzzy Nets Based on-line Cutting Power Recognition in Milling Operations

A self-organising fuzzy-nets optimisation system was developed to generate a knowledge bank able to demonstrate the required cutting power on-line for a short length of time in an NC verifier. This fuzzy-nets system (FNS) uses a five-step self-learning procedure, and was examined for end-milling operations on a Fadal VMC40 vertical machining centre. Data collected from the operations were used to train and test the FNS. Three approaches were employed to predict the cutting power: 1. Metal cutting theory model. 2. Fuzzy-nets model using theoretical data for training. 3. Fuzzy-nets model using experimental data for training. To compare the quality of the data obtained from these approaches, three hypotheses were formulated for this study. The results showed that the FNS possessed a satisfactory range of accuracy with the intended applications of the model.     

五坐标高压水束加工技术的研究

采用高压水束这一特种加工方法来加工,确定了高压水束加工的技术参数,建立了高压水束切割时工件和载荷的理论模型,并将理论模拟分析与实际试验结果进行了比较。研究了不同高压泵压力作用下高压水束的速度及作用范围。实验结果表明,利用高压水束方法加工上述材料能够满足其加工部位的质量要求。     

圆锥曲面数控编程及刀具轨迹仿真分析研究

为提高圆锥特征曲面的加工效率和加工稳定性,建立了一种圆锥特征曲面刀具轨迹分析模型。首先,通过UG软件对圆锥特征曲面进行建模和数控编程。然后,利用Third Wave System—PM仿真软件对刀—工材料属性、刀具轨迹和机床参数进行描述,建立了圆锥特征曲面铣削加工预测模型。最后,利用已经建立的模型对圆锥特征曲面三种刀具轨迹铣削加工过程中的加工时间、切削力、刀具温度和主轴功率进行预测分析和比较。研究认为,往复刀具轨迹相对于单向和螺旋刀具轨迹更适合圆锥特征曲面的铣削加工。     

Investigation of Cutting Force by End Milling Operation

In this work, the cutting forces by end milling operation are analyzed. Therefore, the main parameters of cutting force as cutting speed, feed rate and depth of cut also are investigated in our case. The cutting force is modelled and analyzed into mathematical Wolfram simulations in order to compare the results and in the same time achieve the best solutions. Theoretical results are carried out by using the regression method that required fulfilling the critter by Fisher. The number of experiment, measurements and results of cutting force are presented in 2D as well as 3D. In order to verify the accuracy of the 2D diagram, the results for our case is used both two way such as experimental and theoretical method as well as results are compared. In other hands, these results indicate directly that the optimized parameters are capable of machining the workpiece. The obtained measurement results are compared with theoretical methods in Wolfram software.     

Processing Human Colonic Pressure Signals by Using Overdetermined ICA

Independent component analysis (ICA) is a widely used method for blind source separation (BSS).The mature ICA model has a restriction that the number of the sources must equal to that of the sensors used to collect data,which is hard to meet in most practical cases.In this paper,an overdetermined ICA method is proposed and successfully used in the analysis of human colonic pressure signals.Using principal component analysis (PCA),the method estimates the number of the sources firstly and reduces the dimensions of the observed signals to the same with that of the sources;and then,FastICA is used to estimate all the sources.From 26 groups of colonic pressure recordings,several colonic motor patterns are extracted,which not only prove the effectiveness of this method,but also greatly facilitate further medical researches.     

The design and optimization of micro polycrystalline diamond ball end mill for repairing micro-defects on the surface of KDP crystal

Micro-milling is a promising approach to repair the micro-defects on the surface of KH₂PO₄ (KDP) crystal. The geometrical parameters of micro ball end mill will greatly influence the repairing process as a result of the soft brittle properties of KDP crystal. Two types of double-edged micro ball end mills were designed and a three-dimensional finite element (FE) model was established to simulate the micro milling process of KDP crystal, which was validated by the milling experiments. The rake angle of −45°, the relief angle of 45° and the cutting edge radius of 1.5–2 μm were suggested to be the optimal geometrical parameters, whereas the rake angle of −25° and the relief angle of 9° were optimal just for micro ball end mill of Type I, the configuration with the rake angles ranging from 0° to 35°, by fully considering the cutting force, and the stress–strain distribution over the entire tool and the cutting zone in the simulation. Moreover, the micro polycrystalline diamond (PCD) ball end mills adopting the obtained optimal parameters were fabricated by wire electro-discharge machining (WEDM) and grinding techniques, with the average surface roughness Ra of tool rake face and tool flank face ∼0.10 μm, and the cutting edge radius of the tool ∼1.6 μm. The influence of tool's geometrical parameters on the finished surface quality was verified by the cutting experiments, and the tool with symmetric structure was found to have a better cutting performance. The repairing outlines with Ra of 31.3 nm were processed by the self-fabricated tool, which could successfully hold the growth of unstable damage sites on KDP crystal.     

基于ADAMS的砂轮磨齿机加工过程的动力学分析及仿真

在利用PRO/E建立了磨齿机刀架及工作台模型的基础上,采用ADAMS对磨齿机加工过程进行动态仿真,分析了不同转速下刀具与齿轮间的受力及转矩在加工时的变化状态.     

运用改进残余力向量法的结构损伤识别研究

针对结构损伤识别时测试结构模态振型不完备的情况,采用了自由度凝聚方法进行模型凝聚,并给出了缩聚模型的残余力向量计算公式,证明了残余力向量对结构损伤单元的敏感性.为减小自由度凝聚及测量等因素带来的误差影响,提出了一种改进的残余力向量法.该方法首先通过测试损伤结构多阶模态得到残余力向量,并计算相对于损伤前结构的残余力向量得到残余力向量差矩阵,选取向量差矩阵各行元素中最大绝对值组成改进的残余力向量.损伤识别时,先运用改进的残余力向量确定可能损伤单元,再运用筛选法计算单元损伤程度.数值仿真算例说明,采用该方法只需结构的前几阶低阶频率和振型,就可以快速准确地识别出结构的损伤,显示了该方法具有较好的抗噪性.