模

Die-cutting indentation Edition in creasing machine is growing at the same time also gone from rough hand-made wooden ?ú machine sector assembling wood balsaming die sector ?ú high-tech version of laser territories die Centre ?ú fiber ?ú steel template ?ú synthesizer sandwich steel template deelops.

模切压痕版在模切压痕工艺不停成长的同时也履历了从粗劣的手工界组拆木版→机界木胶合模切版→矮新技艺的激光器界版→纤维塑胶模切版→钢模版→分解式不一明治钢模版的成长历程。

After heat treatment, borides of samples made of sand mould were changed little, otherwise, borides of samples made of metal mould were changed to granulation shape and the impact toughness was increased by 60%..

高硼铁基合金熔体在金属模和砂模不同凝固条件时，奥氏体初晶晶粒随冷却速度增加而减小，硼化物形态发生较大变化；热处理后，砂模铸造的试样，硼化物形态变化不大，而金属模铸造的试样硼化物粒化，其冲击韧度提高了60％。

The new type of stackable coextrusion has less wetted area of fluid and the width of die compared with the conventional coextrusion die.

最新砌积式心轴共押模头技术与传统式共押模头相比，砌积式心轴共押模头有比较少的流体接触表面积及模头宽度。

In this dissertation the"Penalty"finite element method was employed to compute the velocity of the three-dimensional flow of power-law fluid in a profile die. In order to decrease the needed computer memory and raise the stability of numerical simulation, a set of decoupled methods such as PFEM, pseudo-body force method and transformation of momentum equation to the elliptic equation was developed to establish the general finite element equations to compute the distributions of velocity and viscoelastic stress of the three-dimensional viscoelastic flow of the Phan ThienTanner fluid in a profile die. During numerical simulation of the extrudate swell of the PTT fluid, the flow in the die and out of the die was analyzed separately, which demands less computer memory. The key techniques used in numerical simulation of the three-dimensional extrusion from dies such as decision of boundary conditions, creation of initial velocity field, selection of penalty factor, high Weissenberg number problem , regeneration of the free surface were studied in detail.

中文题名聚合物异型材口模挤出三维流动研究副题名外文题名 Study on three-dimensional flow of polymer melts during the process of profile extrusion from dies 论文作者涂志刚导师柳和生包忠诩教授学科专业材料加工工程研究领域\研究方向学位级别博士学位授予单位南昌大学学位授予日期2001 论文页码总数148页关键词挤出成型聚合物材料挤出口模聚合物异型材馆藏号BSLW /2003 /TQ320 /9 本文建立了求解挤出口模内幂律流体流动速度场的通用三维罚有限元模型；对于非线性粘弹性的Phan Thien-Tanner流体，为了降低模拟计算对计算机硬件的要求，并使模拟计算更加稳定，采用了一种去耦算法，包括罚有限元方法、拟体力方法和动量方程的椭圆类方程转化方法，并建立了求解速度场和粘弹性应力场的总体有限元方程；对于PTT流体的挤出胀大问题，提出了挤出胀大熔体口模内外分离模拟法，这样可以显著降低数值模拟对计算机硬件的要求。

The study results show that the dispersion of travelling wave is mainly caused by earth mode; Compared with aerial mode earth mode is greatly influenced by the factors such as ground conductivity, line average height above ground, bundle config...

研究结果表明：行波色散主要由地模引起；行波中地模受大地电阻率、线路高度、分裂导线数、分段地线、连续地线等因素的影响较大，而线模受到的影响较小，因此将线模作为故障定位用行波传播模式比较适宜。

According to the wire electrode on the trajectory of the different forms of control, WEDM can be divided into three types:* is a copy-control, cutting their lines in advance to create the shape of the workpiece and the same mode *, When the rough machining parts and die at the same time * Clamping in the machine tool table, in the process of cutting wire electrode tightly * close to the edge of model for mobile track, thus cutting out the model * with the same shape and precision to work; another One is the optical tracking control, the cutting in line before the first parts in accordance with drawings by a certain ratio of enlarge depicts an electro-optical tracking maps, drawings will be processed when the machine electro-optical tracking placed on the stage, followed on the stage The first photo has to follow the ink line graphics track movement, and then through the use of electrical, mechanical linkage to control the machine tool table work together with the relative electrode wire Xiang Sixing do sports in order to cut out the pattern and shape of the workpiece to the same; a re - Is a digital process control, advanced digital automatic control technology, machine-driven process in accordance with the geometry of the workpiece before the parameters of good pre-processing CNC automatic completion of the processing, production do not look like without drawing board also plans to enlarge, in front of more than two Control in the form of higher precision processing and broad scope of application, at home and abroad for more than 95% of WEDM have been using digital technology.

根据对电极丝运动轨迹的控制形式不同，电火花线切割机床又可分为三种：一种是*模仿形控制，其在进行线切割加工前，预先制造出与工件形状相同的*模，加工时把工件毛坯和*模同时装夹在机床工作台上，在切割过程中电极丝紧紧地贴着*模边缘作轨迹移动，从而切割出与*模形状和精度相同的工件来；另一种是光电跟踪控制，其在进行线切割加工前，先根据零件图样按一定放大比例描绘出一张光电跟踪图，加工时将图样置于机床的光电跟踪台上，跟踪台上的光电头始终追随墨线图形的轨迹运动，再借助于电气、机械的联动，控制机床工作台连同工件相对电极丝做相似形的运动，从而切割出与图样形状相同的工件来；再一种是数字程序控制，采用先进的数字化自动控制技术，驱动机床按照加工前根据工件几何形状参数预先编制好的数控加工程序自动完成加工，不需要制作模样板也无需绘制放大图，比前面两种控制形式具有更高的加工精度和广阔的应用范围，目前国内外95％以上的电火花线切割机床都已采用数控化。

The die of NC tube bending is composed of bending die,clamp die,wiper die,pressure die and mandril.

导管数控弯曲模具包括弯曲模、夹模、压模、防皱模和芯棒。

This parameter canaccurately describe the degree of concentration of vibratory energy of the systemmodal shape in quantity. Using this parameter, the effects of mistuning on thelocalization of system modal shapes for various orders are studied. The reasons of themodal localization phenomenon are analyzed by the perturbation method.

利用所提出的模态局部化参数，研究了失谐对叶盘系统各阶模态局部化程度的影响规律，并利用摄动法对失谐所导致的模态局部化现象进行了分析；同时还发现，失谐叶盘系统的某些中间阶模态的局部化参数值在弱耦合区域的特定位置会产生奇异的突变现象，而这种突变现象是用摄动法难以解释的，并且可能会对失谐叶盘系统的振动稳定性产生重要影响。

The main products of the sticks is die-cutting on automatic die-cutting machine requires will rely on a pipe of knife more force several narrow-necked, smooth production after the die cutting machine out, in the sense of narrow-necked reflected in the die-cutting on the box of the edge is not smooth.

影响产品美观的主要原因是在平压平自动模切机上进行模切加工时需要将靠叼口边的刀多敲破几个小口，才能顺利地将模切后的成品从机器中拉出来，敲破的小口体现在模切后的盒上是边缘不光滑。

At high temperature, the carriers of low energy band thermalize and the carriers of high energy band dominate the luminescence.

Ga〓In〓P喇曼模表现为双模形式：类GaP的LO〓模（无序样品在383cm〓，有序样品在381cm〓）和在360cm〓处类InP的LO〓模。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失