模具 外文翻译 外文文献 英文文献 注塑模

The Injection Molding

1、The injection molding

Injection molding is principally used for the production of the thermoplastic parts,although some progress has been made in developing a method for injection molding some thermosetting materials.The problem of injection a method plastic into a mold cavity from a reservoir of melted material has been extremely difficult to solve for thermosetting plastic which cure and harden under such conditions within a few minutes.The principle of injection molding is quite similar to that of die-casting.The process consists of feeding a plastic compound in powered or granular form from a hopper through metering and melting stages and then injecting it into a mold.After a brief cooling period,the mold is opened and the solidified part ejected.Injection-molding machine operation.The advantage of injection molding are：（ⅰ）a high molding speed adapter for mass production is possible；（ⅱ）there is a wide choice of thermoplastic materials providing a variety of useful properties；（ⅲ）it is possible to mold threads,undercuts,side holes,and large thin section.

2、The injection-molding machine

Several methods are used to force or inject the melted plastic into the mold.The most commonly used system in the larger machines is the in-line reciprocating screw,as shown in Figure 2-1.The screw acts as a combination injection and plasticizing unit.As the plastic is fed to the rotating screw,it passes through three zones as shown：feed,compression,and metering.After the feed zone,the screw-flight depth is gradually reduced,force the plastic to compress.The work is converted to heat by conduction from the barrel surface.As the chamber in front of the screw becomes filled,it forces the screw back,tripping a limit switch that activates a hydraulic cylinder that forces the screw forward and injects the fluid plastic into the closed mold.An antiflowback valve presents plastic under pressure from escaping back into the screw flight.

The clamping force that a machine is capable of exerting is part of the size designation and is measured in tons.A rule-of-thumb can be used to determine the tonnage required

for a particular job.It is based on two tons of clamp force per square inch of projected area.If the flow pattern is difficult and the parts are thin,this may have to go to three or four tons.

Many reciprocating-screw machines are capable of handing thermosetting plastic materials.Previously these materials were handled by compression or transfer molding.Thermosetting materials cure or polymerize in the mold and are ejected hot in the range of 375°C～410°C.Thermosetting parts must be allowed to cool in the mold in order or remove them without distortion. Thus thermosetting cycles can be faster.Of course the mold must be heated rather than chilled,as with thermoplastics.

3、Basic Underfeed Mould

A simple mould of this type is shown in Figure3-1,and the description of the design and the opening sequence follows.The mould consists of three basic parts,namely：the moving half,the floating cavity plate and the feed plate respectively.

The moving half consists of The moving mould plate assembly,support block,backing plate,ejector assembly and the pin ejection system.Thus the moving half in this design is identical with the moving half of basic moulds.

The floating cavity plate,which may be of the integer or insert-bolster design,is located on substantial guide pillars（not shown）fitted in the feed plate.These guide pillars must be of sufficient length to support the floating cavity plate over its full movement and still project to perform the function of alignment between the cavity and core when the mould is being closed.Guide bushes are fitted into the moving mould plate and the floating cavity plate respectively.

The maximum movement of the floating cavity plate is controlled by stop or similar device.The moving mould plate is suitably bored to provide a clearance for the stop bolt assembly.The stop bolts must be long enough to provide sufficient space between the feed plate and the floating cavity plate for easy removal of the feed system.The minimum space provide for should be 65mm just sufficient for an operator to remove the feed system by hand if necessary.

The desire operating sequence is for the first daylight to occur between the floating cavity plate.This ensures the sprue is pulled from the sprue bush immediately the mould

is opened.To achieve this sequence,springs may be incorporated between the feed plate and the floating cavity plate.The springs should be strong enough to give an initial impetus to the floating cavity plate to ensure it moves away with the moving half.It is normal practice to mount the springs on the guide pillars（Figure3-2）and accommodate them in suitable pocket in the cavity plate.

The major part of the feed system（runner and sprue）is accommodated in the feed plate to facilitate automatic operation,the runner should be of a trapezoidal form so that once it is pulled from the feed plate is can easily be extracted.Note that if a round runner is used,half the runner is formed in the floating cavity plate,where it would remain,and be prevented from falling or being wiped clear when the mould is opened.

Now that we have considered the mould assembly in the some detail,we look at the cycle of operation for this type of mould.

The impressions are filled via the feed system（Figure3-1（a））and after a suitable dwell period,the machine platens commence to open.A force is immediately exerted by the compression springs,which cause the floating cavity plate to move away with the moving half as previously discussed.The sprue is pulled from the sprue bush by the sprue puller.After the floating cavity plate has moved a predetermined distance,it is arrested by the stop bolts.The moving half continues to move back and the moldings,having shrunk on to the cores,are withdrawn from the cavities.The pin gate breaks at its junction with the runner（Figure3-1（b））.

The sprue puller,being attached to the moving half,is pulled through the floating cavity plate and thereby release the feed system which is then free to fall between the floating cavity plate and the feed plate.The moving half continues to move back until the ejector system is operated and the moldings are ejected（Figure3-1（c））.When the mould is closed,the respective plates are returned to their molding position and the cycle is repeated.

4、Feed System

It is necessary to provide a flow-way in the injection mould to connect the nozzle（of the injection machine）to each impression.This flow-way is termed the feed system.Normally the feed system comprises a sprue,runner and gate.These terms apply

equally to the flow-way itself,and to the molded material which is remove from the flow-way itself in the process of extracted the molding.

A typical feed system for a four-impression,two plate-type mould is shown in Figure4-1.It is seen that the material passes through the sprue,main runner,branch runner and gate before entering the impression.As the temperature of molten plastic is lowered which going through the sprue and runner,the viscosity will rise;however,the viscosity is lowered by shear heat generated when going through the gate to fill the cavity.It is desirable to keep the distance that the material has to travel down to a minimum to reduce pressure and heat losses.It is for this reason that careful consideration must be given to the impression layout gate’s design.

4.1.Sprue

A sprue is a channel through which to transfer molten plastic injected from the nozzle of the injector into the mold.It is a part of sprue bush,which is a separate part from the mold.

4.2.Runner

A runner is a channel that guides molten plastic into the cavity of a mold.

4.3.Gate

A gate is an entrance through which molten plastic enters the cavity.The gate has the following function：restricts the flow and the direction of molten plastic；simplifies cutting of a runner and moldings to simplify finishing of parts；quickly cools and solidifies to avoid backflow after molten plastic has filled up in the cavity.

4.4.Cold slug well

The purpose of the cold slug well,shown opposite the sprue,is theoretically to receive the material that has chilled at the front of nozzle during the cooling and ejection phase.Perhaps of greater importance is the fact that it provides position means whereby the sprue bush for ejection purposes.

The sprue,the runner and the gate will be discarded after a part is complete.However,the runner and the gate are important items that affect the quality or the cost of parts.

5、Ejection

A molding is formed in mould by injecting a plastic melt,under pressure,into an

impression via a feed system.It must therefore be removed manually.Furthermore,all thermoplastic materials contract as they solidify,which means that the molding will shrink on to the core which forms it.This shrinkage makes the molding difficult to remove. Facilities are provided on the injection machine for automatic actuation of an ejector system,and this is situated behind the moving platen.Because of this,the mould’s ejector system will be most effectively operated if placed in the moving half of the mould,i.e. the half attached to the moving platen.We have stated previously that we need to eject the molding from the core and it therefore follows that the core,too,will most satisfactorily be located in the moving half.

The ejector system in a mould will be discussed under three headings,namely：（ⅰ）the ejector grid;（ⅱ）the ejector plate assembly; and（ⅲ）the method of ejection.

5.1、Ejector grid

The ejector grid（Figure5-1）is that part of the mould which supports the mould plate and provides a space into which the ejector plate assembly can be fitted and operated.The grid normally consists of a back plate on to which is mounted a number of conveniently shaped “support blocks”.

The ejector plate assembly is that part of the mould to which the ejector element is attached.The assembly is contained in a pocket,formed by the ejector grid,directly behind the mould plate.The assembly（Figure5-2）consists of an ejector plate,a retaining plate and an ejector rod.One end of this latter member is threaded and it is screwed into the ejector plate.In this particular design the ejector rod function not only as an actuating member but also as a method of guiding the assembly.Note that the parallel portion of the ejector rod passes through an ejector rod bush fitted in the back plate of the mould.

5.2、Ejection techniques

When a molding cools,it contracts by an amount depending on the material being processed.For a molding which has no internal form,for example,a solid rectangular block,the molding will shrink away from the cavity walls,thereby permitting a simple ejection technique to be adopted.However,when the molding has internal form,the molding,as it cools,will shrink onto the core and some positive type of ejection is necessary.

The designer has several ejection techniques from which to choose，but in general,the choice will be restricted depending upon the shape of the molding.The basic ejection techniques are as follows：（ⅰ）pin ejection（ⅱ）sleeve ejection（ⅲ）stripper plate ejection and（Ⅳ）air ejection.

Figure 2-1a

Figure 2-1b

Figure 3-1

Figure 3-2

Figure 4-1a

Figure 4-1b

Figure 5-1

Figure 5-2

注塑模

1、注塑模

尽管成型某些热固性材料的方法取得了一定的进步，但注塑模主要（还是）用来生产热塑性塑件。（这主要是因为）热固性塑料熔体在很短的时间内就固化和硬化，在从料斗想模具型腔注入热固性塑料熔体的过程中，也会出现这种情况，这个问题一直非常难解决，注塑成型原理和铸造十分相似。注塑成型的工艺包括：首先把料斗中的粉状或粒状的塑料混合物依次输送发哦计量区和溶化区，然后再注射到模具的型腔中，经过短时冷却后，开模，推出成型塑件，注塑机分为手动、半自动及全自动操作。注塑模具有以下优点：（ⅰ）较高的成型速度使大批量生产成为可能；（ⅱ）为成型具有不同使用性能的热塑性材料提供了较宽的选择；（ⅲ）可以成型带有螺纹的塑件、侧向凹陷的塑件、带有侧孔的塑件以及较大的薄壁件。

2、注塑机

熔融塑料进入模具中通常有几种方式。在大型注塑机上常带采用螺杆式的注入方式，如图2-1所示。螺杆同时具有注射和塑化的功能。树脂原料进入旋转的螺杆时，要经过图示的三个区域：喂入区、压实区和计量区。经过喂入区后，为压实树脂原料，螺杆螺旋部分的深度逐渐降低，同时传递树脂原料间因剪切作用而产生的热量，使原料呈半流动状态。在计量区，螺缸表面的加热装置对熔体进一步加热。当熔体充满螺杆前部区域时，螺杆在熔体压力的作用下后退，触动限位开关使液压缸工作，在液压力的作用下推动螺杆向前运动，将熔融塑料注射到闭合的模具型腔中。防倒流阀能够阻止受压熔体倒流进螺杆的螺旋区。

注塑机的锁模系统做提供的锁模力由（塑件在分型面的投影）尺寸决定，锁模力以吨位单位。通常靠经验来决定塑件所需要的锁模力总吨数，一般在塑件投影面积上每平方英寸需要作用两吨锁模力。如果熔体流动困难或塑件较薄，锁模力应提高到三到四吨。

许多往复螺杆式注塑机能生产热固性塑料。以前，热固性塑料由挤出模具或传

递模具生产。热固性塑料熔体在模具内固化或发生聚合反应，并在温度357℃～410℃范围内推出。热塑性塑料熔体必须在模具内冷却成型，以保证推出时不发生变形，这种热固性循环速度很快。当然，生产热塑性塑料时，模具必须被加热，而不是冷却。

3、模具基本结构

这种简单的模具结构如图3-1所示，模具设计和开模顺序将在以下的篇幅中论述。模具由三个基本部分组成，分别是动模部分、浮动型腔板和定模板。

动模部分包括动模板组件、支撑块、支撑板，推出机构和顶杆推出系统。这样设计的动模部分与最基本的模具结构中的动模部分相同。

浮动型腔板通过导柱（图中没有示出）固定在定模板上，设计形式可以是整体式，也可以是镶拼式。导柱必须有足够的长度，（以便磨具工作时）支撑浮动型腔板完成开合动作，并在模具合模时完成对型腔和型芯的找正作用。导套分别安装在动模板和浮动型腔板上。

浮动型腔板的最大运动距离由限位钉或类似装置控制。在动模板的适当位置钻孔，以便安装限位钉。限位钉必须有足够的长度为定模板和浮动型腔板之间提供足够的空间，从而使浇注系统的凝料顺利脱落。如果必须使用手动方式取出凝料，开模时取出凝料所需的最小距离应为65mm。

模具的开模顺序是：浮动型腔板和定模板先分开。确保模具打开时浇注系统凝料立即从浇口套脱出。为实现这样的顺序，定模板和浮动型腔板之间装有弹簧。弹簧的弹力必须足够大，确保在初始推力的作用下浮动型腔板跟随动模部分一起运动。弹簧套在导柱上，一同装在浮动型腔板上相应的弹簧座处（见图5-2），这种形式在弹簧装配中十分常见。

浇注系统的主要部分（分流道和主流道）开设在定模板上，为便于自动操作，分流道应采用梯形截面，以便于脱出浇注系统凝料。注意，如果采用圆形分流道，分流道的一半开设在浮动型腔板上，开模时，分流道可能留在浮动型腔板，将阻碍凝料的脱落或去除。

我们已经详细讨论模具装配，再看这类模具的生产循环过程。

熔体经过浇注系统充满型腔后（见图3-1（a）），经过适当的保压过程，注塑机带动模具开模。压缩弹簧的弹力立即释放出来，推动浮动型腔板和动模部分一起移动，如同前面论述的一样。主流道凝料被拉料杆从浇口套中拉出。浮动型腔板移动预定距离后，被限位钉限位。动模部分继续后移，塑件由于收缩作用包紧在型芯上从型腔中脱出（跟随动模一同移动）。点浇口在结合处拉断，与分流道脱离（见图3-1（b））。

安装在动模部分的拉料杆脱离浮动型腔板，浇注系统凝料由此脱下，然后在浮动型腔板和定模板之间自由落下。动模部分继续后退，直到推出机构开始运动，推出塑件（见图3-1（c））。和模时，模具的各模板回到成型位置，重复下一个注塑循环。

4、浇注系统

在注塑模中，连接（注塑机）喷嘴和各个型腔的流动通道是十分必要的，这种进料通道称为浇注系统。通常，浇注系统由主流道、分流道和浇口组成。这些术语应用在相应的进料通道本身，以及取出塑料时从进料通道中一同取出的浇注系统凝料。

图4-1所示为典型的两版式四腔浇注系统。从图中可以看出原料通过主流道、第一分流道、第二分流道和浇口注入道型腔中。熔融塑料通过主流道和分流道时温度降低而使熔体黏度升高，然而，熔体通过浇口填充型腔时，由于剪切作用产生的热量又使黏度降低。浇注系统要保持适当的长度，使熔体的压力减少和热量损失降到最低。因此，设计时必须充分考虑型腔布局和浇口形式。

4.1、主流道

主流道是将熔融塑料从注塑机喷嘴传递到模具型腔的通道。主流道是浇口套的一部分，浇口套是独立于模具的单独零件。

4.2、分流道

分流道是引导熔体塑料进入模具型腔的通道。

4.3、浇口

浇口是熔融塑料进入型腔的入口。浇口有以下作用：约束熔融塑料流动，应道

模具毕业设计外文翻译(英文+译文)

Injection Molding The basic concept of injection molding revolves around the ability of a thermoplastic material to be softened by heat and to harden when cooled .In most operations ,granular material (the plastic resin) is fed into one end of the cylinder (usually through a feeding device known as a hopper ),heated, and softened(plasticized or plasticized),forced out the other end of the cylinder, while it is still in the form of a melt, through a nozzle into a relatively cool mold held closed under pressure.Here,the melt cools and hardens until fully set-up. The mold is then opened, the piece ejected, and the sequence repeated. Thus, the significant elements of an injection molding machine become: 1) the way in which the melt is plasticized (softened) and forced into the mold (called the injection unit); 2) the system for opening the mold and closing it under pressure (called the clamping unit);3) the type of mold used;4) the machine controls. The part of an injection-molding machine, which converts a plastic material from a sold phase to homogeneous seni-liguid phase by raising its temperature .This unit maintains the material at a present temperature and force it through the injection unit nozzle into a mold .The plunger is a combination of the injection and plasticizing device in which a heating chamber is mounted between the plunger and mold. This chamber heats the plastic material by conduction .The plunger, on each stroke; pushes unbelted plastic material into the chamber, which in turn forces plastic melt at the front of the chamber out through the nozzle The part of an injection molding machine in which the mold is mounted, and which provides the motion and force to open and close the mold and to hold the mold close with force during injection .This unit can also provide other features necessary for the effective functioning of the molding operation .Moving

冲压模具技术外文翻译(含外文文献)

前言 在目前激烈的市场竞争中，产品投入市场的迟早往往是成败的关键。模具是高质量、高效率的产品生产工具，模具开发周期占整个产品开发周期的主要部分。因此客户对模具开发周期要求越来越短，不少客户把模具的交货期放在第一位置，然后才是质量和价格。因此，如何在保证质量、控制成本的前提下加工模具是值得认真考虑的问题。模具加工工艺是一项先进的制造工艺，已成为重要发展方向，在航空航天、汽车、机械等各行业得到越来越广泛的应用。模具加工技术，可以提高制造业的综合效益和竞争力。研究和建立模具工艺数据库，为生产企业提供迫切需要的高速切削加工数据，对推广高速切削加工技术具有非常重要的意义。本文的主要目标就是构建一个冲压模具工艺过程，将模具制造企业在实际生产中结合刀具、工件、机床与企业自身的实际情况积累得高速切削加工实例、工艺参数和经验等数据有选择地存储到高速切削数据库中，不但可以节省大量的人力、物力、财力，而且可以指导高速加工生产实践，达到提高加工效率，降低刀具费用，获得更高的经济效益。 1.冲压的概念、特点及应用 冲压是利用安装在冲压设备（主要是压力机）上的模具对材料施加压力，使其产生分离或塑性变形，从而获得所需零件（俗称冲压或冲压件）的一种压力加工方法。冲压通常是在常温下对材料进行冷变形加工，且主要采用板料来加工成所需零件，所以也叫冷冲压或板料冲压。冲压是材料压力加工或塑性加工的主要方法之一，隶属于材料成型工程术。 冲压所使用的模具称为冲压模具，简称冲模。冲模是将材料（金属或非金属）批量加工成所需冲件的专用工具。冲模在冲压中至关重要，没有符合要求的冲模，批量冲压生产就难以进行；没有先进的冲模，先进的冲压工艺就无法实现。冲压工艺与模具、冲压设备和冲压材料构成冲压加工的三要素，只有它们相互结合才能得出冲压件。 与机械加工及塑性加工的其它方法相比，冲压加工无论在技术方面还是经济方面都具有许多独特的优点，主要表现如下； (1) 冲压加工的生产效率高，且操作方便，易于实现机械化与自动化。这是

英文文献翻译

中等分辨率制备分离的 快速色谱技术 W. Clark Still,* Michael K a h n , and Abhijit Mitra Departm(7nt o/ Chemistry, Columbia Uniuersity,1Veu York, Neu; York 10027 ReceiLied January 26, 1978 我们希望找到一种简单的吸附色谱技术用于有机化合物的常规净化。这种技术是适于传统的有机物大规模制备分离，该技术需使用长柱色谱法。尽管这种技术得到的效果非常好，但是其需要消耗大量的时间，并且由于频带拖尾经常出现低复原率。当分离的样本剂量大于1或者2g时，这些问题显得更加突出。近年来，几种制备系统已经进行了改进，能将分离时间减少到1-3h，并允许各成分的分辨率ΔR f≥（使用薄层色谱分析进行分析）。在这些方法中，在我们的实验室中，媒介压力色谱法1和短柱色谱法2是最成功的。最近，我们发现一种可以将分离速度大幅度提升的技术，可用于反应产物的常规提纯，我们将这种技术称为急骤色谱法。虽然这种技术的分辨率只是中等（ΔR f≥），而且构建这个系统花费非常低，并且能在10-15min内分离重量在的样本。4 急骤色谱法是以空气压力驱动的混合介质压力以及短柱色谱法为基础，专门针对快速分离，介质压力以及短柱色谱已经进行了优化。优化实验是在一组标准条件5下进行的，优化实验使用苯甲醇作为样本，放在一个20mm*5in.的硅胶柱60内，使用Tracor 970紫外检测器监测圆柱的输出。分辨率通过持续时间（r）和峰宽（w,w/2）的比率进行测定的（Figure 1），结果如图2-4所示，图2-4分别放映分辨率随着硅胶颗粒大小、洗脱液流速和样本大小的变化。

外文翻译 - 英文

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译文评阅 评分：___________________（百分制）指导教师（签名）：___________________ 年月日

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