基于广义回归神经网络的线材温度预测分析

线材温度控制的研究是线材生产中控制的主要问题.本文利用广义回归神经网络预测线材的温度,利用预测结果控制水箱的喷水量,从而达到控制线材温度的目的,仿真结果表明此方法是有效的.     

铜包铝复合线材静液挤压加工工艺研究

静液挤压是一种有完全等静水条件下实现大变形的塑性加工方法,介绍了利用静液挤压进行铜包铝复合线材的工艺方法,通过优化工艺参数,静液挤压加工的铜包线材实现了铜、铝的冶金结构,其电气、力学性能满足美国ASTM电缆线标准。     

利用Hough变换的棒线材位置检测方法的研究

目前我国钢铁企业在棒线材计数上普遍采用人工计数的方法。这种方法不仅效率低而且精度差。针对这种情况,通过采用现代化手段和技术创新,开发出适合我国钢铁企业的棒材自动计数系统尤为重要。要完成识别棒线材根数图像识别系统的研发,棒线材位置及计数的检测是至关重要的。利用Hough变换及推广的Hough变换来完成对棒线材位置和计数的检测。通过现场采集到的图像进行的试验结果表明,该方法不仅不受棒线材种类及端面形态的影响,而且对端头不齐、捆扎散乱的棒线材也有较好的识别效果,具有一定的实用价值。     

微细扁线材生产工艺及其装备开发

简要介绍了微细扁线材及其研究现状,在加工难点分析的基础上,重点叙述了微细扁线材多级连续辊压成型装备的开发及其各部分的实现流程.     

铂铑合金线材生产中润滑剂的使用及管理

铂铑合金线材生产主要是通过润滑拉伸方法进行的.润滑拉伸过程是一个由线材,拉伸模,润滑剂三者构成的摩擦学系统.其中,润滑剂起着降温,减摩的作用,对于提高生产效率,改善线材表面质量,延长模具使用寿命具有重要的意义.润滑效果的好坏涉及到加工过程中的许多环节.1.线材加工过程中的润滑     

油气润滑技术在高线轧机上的应用

主要阐述了油气润滑系统的组成、工作原理以及在高速线材轧机上的应用.油气润滑技术实现了定量、均匀的方式和较远距离供油,满足了线材轧机导卫轴承润滑的要求,应得到大力推广.     

国内外线材生产综述

通过改造、引进和自行研制，近十多年来我国在线材生产技术上已取得了很大进步，但与国外相比还有很大差距。本文介绍了国内外线材轧机及产品的生产和发展状况，同时以大量数据、实例进行了对比，并根据自身特点提出了今后我国线材生产的发展方向。     

高线穿水冷却系统温度场的有限元分析

不同种类的线材对吐丝温度的要求不同,文中针对某线材生产线的工艺特点,利用了有限元分析软件分析了主要因素对西6．5mm的Q235线材吐丝温度的影响,为线材在轧后水冷控制过程提供理论依据。     

线材在线光电检测系统的抗干扰分析与措施

在线材生产过程中,一般使用在线光电检测系统对线材尺寸进行控制,但由于实际生产过程环境恶劣,各方面的干扰会严重影响系统工作的可靠性和稳定性.文章分析线材在线光电检测系统工作过程的干扰源,并设计相应的抗干扰措施,有效地提高了系统的抗干扰能力.     

电子线材料自动剪剥机理及设备的研究

电子线材在电子仪器设备和电行业中用量极大。本文详细解析电子线材自动剪裁剥皮机理及ＰＪＢ－８０型宽排线自动剪线剥皮机的开发和研究。     

A new sawing machine by diamond wire

Diamond wire is widely used for stone cutting; it is typically employed to extract a block in quarry and to square the block in a machining company. In particular, the frames to square or to cut the blocks present many technological limits, such as the high costs of the diamond wire, the frequent break of the diamond wire during cutting, the poor quality of cut surfaces, and the dangerous process and productivity lower than that of the same tool used in a quarry. The present work shows an innovative prototype machine to cut by a diamond wire which overcomes the aforementioned technological limits. The developed machine has a bridge frame among which two pulleys move the diamond wire as regards the stone block according with the feed speed. The diamond wire moves on the two pulleys with a cutting speed. A tensile force is applied to the wire that twists it during the contact with the stone, instead of keeping it along a straight direction parallel to the foundation of the machine. The twisting of the diamond wire makes the use of the wire itself more productive and safer, since the wear of each single bead during cutting is more uniform. Moreover, the resulting specific pressure acts on each bead along the arc of contact with the cut block and increases along the cutting direction from the entrance to the exit of the contact with the stone. The increasing of the specific pressure causes a bending of the diamond wire during the contact with the stone. The developed prototype was provided with a sensory system to measure both the cutting power and the tensile force of the diamond wire during experimental tests. In this way it was possible to verify the functionality of the prototype plant and, in the same time, to evaluate the productivity of the implemented cutting process.     

线切割机床加工铝件电极丝进电装置研究

针对普通线切割机床加工铝件常出现的问题,对普通线切割机床加工铝件的切割过程特性进行了研究.对普通线切割机床加工铝件时产生的Al2O3损坏机床电极丝进电装置导电块的避免方案进行了分析,提出了取消普通线切割机床电极丝进电装置导电块,重新设计普通线切割机床电极丝进电装置的方案.为提高切割效率,进电位置选在了两前导轮轴处;为避免在导轮轴处产生火花放电,腐蚀导轮,影响导轮寿命,对导轮结构进行改进,选择了加长导轮轴;为不影响导轮的运转,选择用石墨与轴接触,达到既能导电,同时还能自润滑以提高寿命.研究结果表明,改进后的普通线切割机床,在切割铝件时,可避免导电块的损坏问题,降低断丝、短路的机率,提高被切割铝件的表面质量.     

耐磨性和机加工性优良的药芯焊丝

研究了一种堆焊药芯焊丝，按通常工序制造与修复轧辊等设备，具有焊态机械加工性好，消除应力处理后硬度高、耐磨性好等特点，较好地处理了硬度、耐磨性和机加工性之间的矛盾。对其设计原理、具体的应用进行了阐述。     

数控线切割加工空间曲面CAD/CAM技术研究

目前国内加工空间曲面零件通过采用锥度切割装置使电极丝倾斜一定角度来实现锥度切割,这种方法易产生的加工误差较大.论文在五轴联动数控线切割加工系统的运动分析的基础上,建立了直角坐标下空间曲面零件线切割加工成型的数控模型,阐述了利用G代码合成空间曲面的方法,提出了运用模块化技术设计空间曲面线切割五轴联动数控系统上位机软件设计方案,为空间曲面线切割CAD/CAM系统的研究提供了依据.     

An integrated system for setting the optimal parameters in IC chip-package wire bonding processes

The wire bonding process is the key process in an IC chip-package. It is an urgent problem for IC chip-package industry to improve the wire bonding process capability. In this study, an integrated system is proposed to identify and control parameters in the wire bonding process in order to achieve high level performance and quality. First, an experimental design with Taguchi method is applied to identify the critical parameters in the wire bonding process. Then, an ANN is used to establish the nonlinear multivariate relationships between wire boning parameters and responses. Finally, a GA is adopted to find the most desired parameter settings by using the output of ANN as the fitness measure. Another popular method, response surface method, for parameter design problems is conducted for comparison purpose. Results of this comparison demonstrate the effectiveness of the proposed approach.     

快走丝切电火花线割机床割铝装置的设计

快走丝电火花线切割机床切割铝件时出现导电块磨损严重、电极丝与导电块之间有电火花产生、断丝现象频繁等不良现象,严重影响了铝件的表面加工质量和加工效率。首先分析了线切割机床切割铝件时产生上述不良现象的原因;然后通过改变原有的导电块导入脉冲电源负极的方式,采用储丝筒导入脉冲电源负极的方式,并设计了专用的脉冲电源负极导入装置,确保电极丝与电源的可靠接触;最后通过实验验证了设计方案的可靠性和正确性,为铝件的切割加工提供了技术支持。     

超细合金丝熔炼技术研究

通过对以铜金属为基材的合金丝熔炼技术的研究,探讨了在合金丝的冶炼过程中的各金属元素的配比、熔炼过程的各种准备工作和具体的工艺过程等,以达到制作高品质超细合金丝的目的。     

Vibration modeling and analysis of wire during the WEDM process

During the wire electrical discharge machining (WEDM) process, the vibrations of the wire generated by the gap force is the main cause of imprecision. To achieve more precise results with better accuracy, understanding of the vibration management of the wire is essential. In this article, the wire’s vibration behavior is introduced briefly, followed by an exploration of an equation, derived from Hamilton’s principle, which expresses the vibration of a wire moving axially. This equation is presented under some simplified assumptions. In addition, the relationship between the maximum amplitude of the vibration and the main relative variables is presented. The solution demonstrates that a thicker workpiece results in a larger amplitude of vibration, yet the axial speed of the wire has no impact on the maximum amplitude.     

基于虚拟仪器的汽车线束阻抗检测系统

应用交流电路计算原理、检测技术和虚拟仪器技术,在LabVIEW开发环境下设计汽车线束阻抗检测系统,实现了汽车线束阻抗的在线检测,同时提供局域网配置方案,能够实现产品的在线实时监控.     

一种高速钢丝合股机放线机构与张力平衡调节系统的分析与设计

分析了钢丝合股机对合股线材质量影响的相关因素,根据原因提出了总体设计思路。然后设计出一套合股机高速运行时,能同时实时调节各股线材放线张力大小和张力平衡的调节机构及控制系统,从而实现合股时线材的恒张力,保持各合股线材张力的一致性,满足悬垂差指标要求。