CCMT2010机床展品快照

济二动梁龙门镗铣加工中心亮相展会 本届中国数控机床展览会,济南二机床将要展出XH2125×40型动梁龙门镗铣加工中心。展品在技术性能、自动化程度、精度、可靠性等方面,具有国内领先、世界先进水平,是各行业提高大型零件加工效率和质量的关键设备。展品采用横梁升降式龙门框架结构：固定式床身、移动工作台,横梁沿立柱导轨垂直移动,滑枕式主轴头可随溜板在横梁导轨上水平移动,亦可沿溜板导轨垂直移动。适用于大中等尺寸和重量的金属零件平面、复杂曲面和孔的镗、铣、钻等切削加工。     

数控镗铣加工中心任意角度位置快速定位

数控镗铣加工中心适用于箱体类零件的加工,通常工作台在4个特殊的位置(0°、90°、180°、270°)上加工,如遇到工件上有斜孔即工作台不在4个特殊的位置,而是旋转一定角度,就需要定位加工,文中通过宏程序实现了数控镗铣加工中心任意角度位置的快速定位,操作者只需输入几个参数,机床就可按宏程序快速定位建立坐标系加工。     

我国五轴联动机床竞相推出

当前,国产五轴联动数控机床在品种上,已经拥有立式、卧式、龙门式和落地式的加工中心,适应大小不同尺寸的复杂零件加工,还有五轴联动铣床和大型镗铣床以及车铣中心等,基本涵盖了国内市场的需求。精度上,北京机床研究所的高精度加工中心、宁江机械集团股份有限公司的NJ-5HMC40卧式加工中心和交大昆机科技股份有限公司的TH61160卧式镗铣加工中心都具有较高的精度,可与发达国家的产品相媲美。在产品市场销售上,江苏多棱、济南二机床、北京机电研究院、宁江机床、桂林机床、北京一机床等企业的产品,已获得国内市场的认同。我国五轴联动机床竞…     

CIMT‘99（中国国际机床展览会）国内展品预报（二）

加工中心 TH5945高速立式加工中心是沈阳机床股份有限公司的产品,机床在国内率先采用电主轴结构,最高转速可达12000r/min,具有大功率、高转速、高精度、高柔性、高效率等特点。工件一次装夹后可连续完成钻、铣、镗、攻丝等多种工序加工,主要加工复杂的三维空间曲面、凸轮零件、结构复杂的板盘类零件,以及高精度孔系要求的箱体类零件,特别适合于中、大批量零件的生产。     

TH65100×100／A型卧式镗铣加工中心回转工作台的电气控制

TH65100×100／A型卧式镗铣加工中心除了具有X、Y、Z三个进行直线运动的坐标轴外,还有绕Y轴进行圆周运动的回转工作台（B轴）。回转工作台是镗铣床的重要附件之一,主要用来装夹工件,扩大主机的加工范围,机床在需要多轴联动加工曲线和曲面的场合,回转工作台必须进行连续圆周运动,本机床的回转工作台是由伺服电动机驱动的,可进行连续圆周进给运动。     

XHZ7916/16立柱移动式滑枕床身加工中心

桂林机床股份有限公司最近成功开发出可一次装夹工件、自动进行铣、镗、钻、攻丝等多面工序加工的大型XHZ7916/16立柱移动式滑枕床身加工中心机床。该加工中心机床广泛适用于航空航天、汽车、船舶等制造领域,填补了国内空白。XHZ7916/16立柱移动式滑枕床身加工中心：工作台面积(宽×长)1600×16000mm高7米,净重：135T工艺范围和用途：本机床为立柱移动式滑枕床身式加工中心,配置先进的自动万能铣头,可一次装夹工件自动进行多种空间方向的铣、镗、钻、攻等多面项工序加工,自动化、复合化程度高,加工范围大、工艺范围广,适用于航空航天、汽车、模具、船舶、机械等需加工大中型复杂零件的制造领域。     

TH6363／S卧式加工中心

在今年的北京国际机床展览会上，汉川机床有限责任公司将展出最新研制成功的具有国内领先水平的双交换工作台卧式加工中心产品——TH6363／S。该产品具有高精度、高速度、高效率、高刚性的特点，工件在一次装夹后，可对四个面连续完成铣、钻、镗、铰、攻丝等多种工序的精密加工，广泛适用于航空航天、汽车、摩托车、机器制造业及其它行业加工箱体零件的孔和平面。     

TH5640立式加工中心

TH5640立式加工中心是八十年代广泛使用的自动换刀数控机床。适用于中小型板件、盘件、壳体件、模具等复杂零件的多品种或中小批量加工。该机床具有三个数控轴,工件一次装夹后可自动完成铣、钻、镗、铰、攻丝等多种工序的加工。如选用数控转台,可扩为四轴控制,实现多面加工。 现我厂还生产其它三种加工中心,一种是我厂和德国合作生产的TH5663(MCI18)立式加工中心,第二种是我厂自行开发制造的VMC140立式加工中心和第三种ZN534O钻削中心。     

亮相CIMT2005的"汉川牌"精品机床

汉川机床有限责任公司近几年来大力开发精密、高效、高可靠性的数控机床新产品,取得丰硕成果。汉川机床有限责任公司今年开发的几种高技术含量的新产品将在CIMT2005首次亮相。重点展品有:1.TH6363/S-840D交换工作台卧式加工中心。该产品采用了一系列国际上流行的新技术。这款机床的最大特点是具有可交换的工作台。采用了光栅尺闭环控制技术,全封闭护罩。能实现强力切削、高速定位、随机换刀等功能,工件一次装夹后可自动连续完成铣、钻、镗、铰、攻丝等多种工序加工,适用于板体、盘体、壳体、模具等复杂异型零件的多工序加工,极具市场潜…     

宁江机床集团CIMT2003展品简介

ＮＪ＿5ＨＭＣ4 0五轴联动加工中心　　该机床是宁江机床集团新近开发的高技术产品 ,工作台可连续分度 ,主轴头可连续分度摆动 ,定位精度和回转工作台分度精度均达到微米级水平。工件一次装夹后 ,可完成铣、镗、铰、攻螺纹和轮廓的粗、精加工 ,适用于叶片、叶轮、模具工业、航空和船舶工业等各种类型复杂曲面零件加工 ,能满足中、小型箱体零件和空间曲面多品种加工的需要。该机床床身、立柱、拖板、主轴箱和工作台等均采用高级密烘铸铁并配置合理的加强筋结构 ,确保机床的静态和动态刚性。机床采用倾斜式床身、固定框式立柱结构 ,承载能力高…     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

交通荷载作用下桥梁结构参数识别方法

应用动力节点加载法,将作用在桥梁上的交通荷载转化为等效节点荷载,再用两步构造法识别结构物理参数.第1步,用Newmark-β方法变换结构运动方程,并用结构的加速度响应求得变换空间内的位移、速度和加速度响应;第2步,基于最小二乘原理,构造出变换空间内求解结构参数的递推式,进行结构物理参数识别.数值模拟结果表明,在交通荷载作用下,该方法能够快速、准确地进行桥梁结构参数识别.     

RLS and LMS blind adaptive multi-user detection method and comparison in acoustic communication

RLS and LMS blind adaptive multi-user detection algorithm and multi-user detector was proposed to solve the problem of multi-user signal detection problem encountered in underwater acoustic communication networks.In simulation analysis,RLS and the LMS blind adaptive multi-user detector were designed and tested for synchronous and asynchronous multi-user communication process.The results of SIR comparison and MMSE comparison show that,both of the two methods can realize blind adaptive detection when any user change in multi-user communication,during this process,the training communication sequences are not needed.The RLS algorithm has about 5 dB higher in SIR compared with LMS algorithm,and the convergence velocity of RLS algorithm is also higher than LMS algorithm when the communication users change.RLS algorithm has better ability in multi-user detection than that of LMS algorithm,and it has great attraction and guiding significance for solving the problem of multiple access interference(MAI) in multi-user communication.     

Robust Impedance Control of Robots Using an Adaptive Interaction Force Observer

For robot interaction control,the interaction force between the robot and the manipulated object or environment should be monitored.Impedance control is a type ...     

Research on key techniques of expendable conductivity temperature depth measuring system

This paper analysis the developing of expendable conductivity temperature depth measuring system(XCTD)and introduce its principle of measuring about temperature,salinity and depth of ocean.Some key techniques are put forward.According to the real needs of XCTD,conductivity sensor with high sensitivity is designed by principle of electromagnetic induce,the ocean conductivity from induced electromotive force has been calculated.Adding temperature correction circuit would help to reduce error of conductivity measurement because of sharply changing temperature.Advanced temperature measuring circuit of high precision and the constant current source is used to weaken effect of self-heating of resistance and fluctuation of the source.On respect of remote data transmission,LVDS is a good choice for the purpose of guarantee the quality of data transmitted and the transmission distance is reaching to thousand meters in the seawater.Modular programming method is also brought into this research aimed at improve the stability,reliability and maintainability of the whole measuring system.In February,2015,the trials in South China Sea demonstrate that the developed XCTD realize effective measurement at a speed of 6 knots and detection depth at 800 m.The consistency coefficient of the acquired data is greater than 0.99 and the success rate of probe launching is above 90%.     

CHARACTERISTCS OF FLUID FILM IN OPTIMIZED SPIRAL GROOVE MECHANICAL SEAL

In order to investigate the sealing performance variation resulted from the thermal deformation of the end faces, the equations to calculate the fluid film pressure distribution, the bearing force and the leakage rate are derived, for the fluid film both in parallel gap and in wedgy gap. The geometrical parameters of the sealing members are optimized by means of heat transfer analysis and complex method. The analysis results indicate that the shallow spiral grooves can generate hydrodynamic pressure while the rotating ring rotates and the bearing force of the fluid film in spiral groove end faces is much larger than that in the flat end faces. The deformation increases the bearing force of the fluid film in flat end faces, but it decreases the hydrodynamic pressure of the fluid film in spiral groove end faces. The gap dimensions which determine the characteristics of the fluid film is obtained by coupling analysis of the frictional heat and the thermal deformation in consideration of the equilibrium condition of the bearing force and the closing force. For different gap dimensions, the relationship between the closing force and the leakage rate is also investigated, based on which the leakage rate can be controlled by adjusting the closing force.     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

OPTIMIZATION METHOD ON IMPELLER MERIDIONAL CONTOUR AND 3D BLADE

An optimization method for 3D blade and meridional contour of centrifugal or mixed-flow impeller based on the 3D viscous computational fluid dynamics (CFD) analysis is proposed. The blade is indirectly parameterized using the angular momentum and calculated by inverse design method. The design variables are separated into two categories: the meridional contour design variables and the blade design variables. Firstly, only the blade is optimized using genetic algorithm with the meridional contour remained constant. The artificial neural network (ANN) techniques with the training sample data schemed according to design of experiment theory are adopted to construct the response relation between the blade design variables and the impeller performance. Then, based on the ANN approximated relation between the meridional contour design variables and impeller performance, the meridional contour is optimized. Fewer design variables and less calculation effort is required in this method that may be widely used in the optimization of three-dimension impellers. An optimized impeller in a mixed-flow pump, where the head and the efficiency are enhanced by 12.9% and 4.5% respectively, confirms the validity of this newly proposed method.