超声波电机在三维微细电火花加工中的应用

论述了三维微细电火花加工系统的发展前景,搭建了一台微细电火花加工系统的原型样机.在该系统中,使用超声波电机做驱动装置,为微细电火花加工构造了可实现纳米级微量进给的运动平台,并进行了初步的平台定位精度检测.实验结果证明系统运行良好,运动平台能够达到很高的定位精度.课题在设计实用的精密微量进给机构的电机选择上,探索了新的方法.     

慈溪嘉友精密模具机械总汇

1.代理台湾茗亚精密电火花附镜面加工电源(浙江总代理),韩国昌信龙门式高速冲床30～300t。代理各类进口模具制造设备,并提供咨询服务。 2.可供二手设备:慢走丝100D,日本三菱1995年全新未用400mm×750mm×260mm;兄弟牌1998年300mm×200mm×200mm、260mm×160mm×120mm沙迪克A330W、亚特2001年     

改善线切割加工表面粗糙度的措施

表面粗糙度是电火花线切割机床国家标准(GB7926-87)中工件精度第三项检验项目。其要求是:对12mm×12mm×40mm标准样块按走向为45°线切割成斜方,材料去除率大于20mm~2/min时,表面粗糙度R_α≤2.5μm,表面粗糙度值问题一直是电火花线切割加工工艺中严重的问题之一。笔者在可调线架DK7725D型线切割加工机床上进行了大量的加工试验,发现加工表面粗糙度超值的主要原     

电火花复合加工原理及应用

介绍了电火花复合加工是在电火花加工基础上产生和发展起来的.通过对电火花加工、超声波电火花加工、超声振动辅助气中放电加工原理和特点的比较,指出了超声振动辅助气中放电加工技术应用前景,以及电火花复合加工的发展趋势.     

压电驱动技术在电火花加工中的应用

压电驱动技术可实现电极直接驱动进行电火花加工,该技术可以广泛地用于航天航空,精密模具,医疗器械等领域中微型器件或异形微小孔的加工,介绍几种典型的压电驱动技术,如椭圆式电火化加工技术,基于超声马达的电火化加工技术,蠕动式电火花加工技术,为提高电火花加工的效率,缩短加工时间,提出在压电驱动技术的基础上进一步在加工电极上附加超声振动,为该项新技术的发展提供了启示。     

送丝滚轮电火花修棱加工技术研究

研究开发的送丝滚轮电火花修棱加工系统,主要由单片机控制装置、CNC电火花加工装置、送丝滚轮自动分度装置等部分组成,应用该系统对送丝滚轮电火花修棱加工进行了工艺试验研究.     

压电自适应微细电火花加工技术

针对微细电火花加工技术的特点,开发、研制了新型的压电自适应微细电火花加工装置,介绍了该装置的结构和工作原理,分析了压电致动器的性能以及放电间隙与开路电压的关系,并利用该装置进行了试验研究。试验结果表明该加工技术可以实现放电间隙与放电状态的自适应调节,加工效率较高。     

基于直线电动机驱动的绿色夹具

我们设计出一种新型的集加工、拆卸为一体的高效夹具。该夹具装置是以直线电动机作为驱动动力的,具有便于设计、结构紧凑、技术性能较为完善等优点,应用前景广阔。1.夹具工作原理本设计装置的动力源采用双边型直线电动机,     

一种移动式法兰密封面加工装置

为了实现压力容器小法兰密封面的现场加工与修复,介绍了一种可移动式的法兰密封面加工装置.该装置以法兰自身定位安装,它的主运动是由电动机通过行星齿轮减速器驱动,转臂上的2台步进电动机实现了刀具平行法兰端面和平行法兰孔轴线的进给运动,具备直线和圆弧插补功能,由手持盒进行参数化编程和操作.实际使用表明,该装置体积小,重量轻;适用法兰尺寸范围大,加工质量稳定;易于操作、维护,安全可靠.     

超声振动搅拌装置用于EDM加工的试验研究

利用超声波清洗原理及搅拌作用 ,设计电火花加工超声振动搅拌装置 ,并进行加工试验。结果表明 ,超声振动搅拌装置对改善加工表面粗糙度、提高加工效率有明显效果     

微小型电火花加工装置连续自动送丝的研究

针对电极夹持、更换困难,辅助加工时间长等问题,提出了在微小型电火花加工装置中实现连续自动送丝的方案,采用该方案不仅可提高加工效率,同时可以消除电极重新定位所带来的误差。系统地分析了超声马达定子的驱动原理,推导出了马达的振动方程。进行了电极驱动性能的测试和实验加工,验证了连续自动送丝方案的可行性。     

微通道结构带状电极电火花加工方法研究

针对大厚度、高深宽比金属微通道结构加工的难题,提出一种带状电极电火花加工方法,利用厚度30～100 μm的带状电极,在金属基体上高效制造微通道结构。研究了带状电极电火花加工机理,建立了带状电极在加工间隙中的运动模型,分析了影响带状电极运动的主要因素,搭建了带状电极电火花加工装置,开展了微通道结构带状电极加工实验研究,获得了带状电极电火花加工基础工艺规律。利用带状电极电火花加工方法成功加工出的具有200条微通道的反应器结构和44×45微换热器阵列结构,表明带状电极电火花加工可以实现窄宽度(100 μm以下)、大厚度(35 mm以上)、高深宽比(10以上)和高精度(缝宽标准差3 μm以内)的大批量微通道结构的高效加工,相关方法和技术有望在微模具、微散热器、微反应器等领域获得推广和应用。     

钛合金深小孔超声电火花加工工艺与实验研究

针对钛合金深小孔加工的技术难点,研制了具有四轴联动功能的微细超声电火花加工机床,在所研制的机床上,进行了钛合金深小孔超声电火花复合加工实验,就超声振动及削边电极在加工中的作用进行了系统和研究。     

Experimental research on a modular miniaturization nanoindentation device

Nanoindentation technology is developing toward the in situ test which requires miniaturization of indentation instruments. This paper presents a miniaturization nanoindentation device based on the modular idea. It mainly consists of macro-adjusting mechanism, x-y precise positioning platform, z axis precise driving unit, and the load-depth measuring unit. The device can be assembled with different forms and has minimum dimensions of 200 mm × 135 mm × 200 mm. The load resolution is about 0.1 mN and the displacement resolution is about 10 nm. A new calibration method named the reference-mapping method is proposed to calibrate the developed device. Output performance tests and indentation experiments indicate the feasibility of the developed device and calibration method. This paper gives an example that combining piezoelectric actuators with flexure hinge to realize nanoindentation tests. Integrating a smaller displacement sensor, a more compact nanoindentation device can be designed in the future.     

Machining Characteristics of Al2O3/6061Al Composite using Rotary EDM with a Disklike Electrode

This work optimises the cutting of Al₂O₃/6061Al composite using rotary electro-discharging machining (EDM) with a disklike electrode by using Taguchi methodology. The Taguchi method is used to formulate the experimental layout, to analyse the effect of each EDM parameter on the machining characteristics, and to predict the optimal choice for each EDM parameter. Four observed values, MRR, EWR, REWR, and SR, are used to verify this optimisation of the machining technique. In addition, six independent parameters are chosen as variables in evaluating the Taguchi method and are categorised into two groups: 1. Electrical parameters, e.g. polarity, peak current, pulse duration, and powder supply voltage. 2. Non-electrical parameters, e.g. circumferential speed of electrode, reciprocating speed. The analysis of the Taguchi method reveals that, in general, the electrical group more significantly affects the machining characteristics than the non-electrical group. Also derived herein are semi-empirical equation that contain all of the machining characteristics. Experimental results are presented to illustrate the proposed approach.     

MICRO ELECTRICAL DISCHARGE MACHINING DEPOSITION IN AIR

A new deposition method is described using micro electrical discharge machining (EDM) to deposit tool electrode material on workpiece in air. The basic principles of micro electrical discharge deposition (EDD) are analyzed and the realized conditions are predicted. With an ordinary EDM shaping machine, brass as the electrode, high-speed steel as the workpiece, a lot of experiments are carried out on micro EDD systematically and thoroughly. The effects of major processing parameters, such as the discharge current, discharge duration, pulse interval and working medium, are obtained. As a result, a micro cylinder with 0.19 mm in diameter and 7.35 mm in height is deposited. By exchanging the polarities of the electrode and workpiece the micro cylinder can be removed selectively. So the reversible machining of deposition and removal is achieved, which breaks through the constraint of traditional EDM. Measurements show that the deposited material is compact and close to workpiece base, whose components depend on the tool electrode material.     

利用声表面波实现液体的二维驱动(英文)

报道了利用声表面波实现水滴二维驱动的实验.在127.8° Y切X向传播的铌酸锂衬底上制作了4个叉指换能器.每个叉指换能器由10对电极构成,其叉指周期为400 μm,宽度为100 μm,孔径为12 mm,整个器件的尺寸为26 mm×26 mm×0.45 mm.由于铌酸锂晶体的各向异性,叉指换能器沿Y、X方向的谐振频率不同,分别为9.3 MHz 和9.6 MHz.基于铜材料相对于铝材料的优点,选用了铜材料并采用剥离工艺制作了电极,得到了优化的工艺参数.最后,用了超长时间超声波辅助方法彻底去除残胶,实现了对水滴的二维驱动,输入功率为9 W,液滴运动的平均速率为5 mm/s.利用ANSYS软件分析了声表面波在铌酸锂衬底内的传播,内部振动的模拟结果与理论分析一致.实验表明,利用声表面波实现液体的二维驱动是可行的,该液体驱动原型可用于片上系统和μ-TAS.     

空气中微细电火花沉积与去除可逆加工技术研究

论述了一种新的电火花加工方法。它使用通用的电火花成形加工机床,利用常见的电极材料,在空气介质中,通过脉冲放电在工件表面上沉积生长电极材料,再通过反转极性和适当的轨迹控制对所生成的沉积材料进行有选择的去除加工,进而实现材料的生长与去除可逆加工。通过对电火花加工理论的研究,预测和论证了实现这一新加工方法的可能性和实现条件。通过试验成功地将钢、铜和钨三种电极材料沉积到工件上,形成直径为 100~240 mm、高度为1 000~2 500 mm的微小圆柱体。并对沉积物进行了选择去除,实现了在同一设备上的可逆电火花加工。对沉积材料的致密性、硬度及其与工件的结合强度等进行了系统的分析,表明沉积物组织致密、坚硬,可以满足功能材料的要求。     

Principle and experimental verification of novel dual driving face rotary ultrasonic motor

Existing rotary ultrasonic motors operating in extreme environments cannot meet the requirements of good environmental adaptability and compact structure at same time,and existing ultrasonic motors with Langevin transducers show better environmental adaptability,but size of these motors are usually big due to the radial arrangement of the Langevin transducers.A novel dual driving face rotary ultrasonic motor is proposed,and its working principle is experimentally verified.The working principle of the novel ultrasonic motor is firstly proposed.The 5th in-plane flexural vibration travelling wave,excited by the Langevin transducers around the stator ring,is used to drive the rotors.Then the finite element method is used in the determination of dimensions of the prototype motor,and the confirmation of its working principle.After that,a laser Doppler vibrometer system is used for measuring the resonance frequency and vibration amplitude of the stator.At last,output characteristics of the prototype motor are measured,environmental adaptability is tested and performance for driving a metal ball is also investigated.At room temperature and 200 V(zero to peak) driving voltage,the motor’s no-load speed is 80 r/min,the stalling torque is 0.35 N·m and the maximum output power is 0.85 W.The response time of this motor is 0.96 ms at the room temperature,and it decreases or increases little in cold environment.A metal ball driven by the motor can rotate at 210 r/min with the driving voltage 300 V(zero to peak).Results indicate that the prototype motor has a large output torque and good environmental adaptability.A rotary ultrasonic motor owning compact structure and good environmental adaptability is proposed,and lays the foundations of ultrasonic motors’ applications in extreme environments.