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1、Unit Two The Injection Mold Design,Lesson 4 The Injection Molding and Machine Lesson 5 Three -plate Injection Mold Lesson 6 Feed System Lesson 7 Mold Cavities and Cores Lesson 8 Ejection System Lesson 9 Splits Lesson 10 Mold Cooling Lesson 11 Runnerless Molds Nozzle Types,Lesson 4 The Injection Mold
2、ing and Machine,Injection molding（British English: moulding） is a manufacturing process for producing parts from both thermoplastic and thermosetting plastic materials. Material is fed into a heated barrel， mixed， and forced into a mold cavity where it cools and hardens to the configuration of the m
3、old cavity. 注塑成型是将热塑性和热固性塑料加工 成零件的制造过程。材料被放入加热筒中，混 合后压入模腔，冷却硬化成模腔的形状。,Injection molding machines consist of a material hopper， an injection ram or screwtype plunger， and a heating unit. They are also known as presses. They hold the molds in which the components are shaped. 模具注塑机由一个料斗、注射活塞或螺旋式活塞以及一个加
4、热装置构成。它们也被称为压力机，内含零部件形成的模具。,Molds are typically constructed from hardened steel， prehardened steel， aluminium， and/or berylliumcopper alloy. Prehardened steel molds are less wear resistant and are used for lower volume requirements or larger components. 模具通常由淬火钢、预硬钢、铝或铍-铜合金制成。预硬钢模具不耐磨，适用于小批量生产或制造较大的
5、零件。,Hardened steel molds are heat treated after machining. These are by far the superior in terms of wear resistance and lifespan. Beryllium copper is used in areas of the mold which require fast heat removal or areas that see the most shear heat generated. 淬硬钢模具加工后要进行热处理。这类模具在耐磨性和使用寿命方面具有较强的优势 。铍-铜
6、合金适用于制造需快速去热或消除产生的热能的模具。,Plastic resin enters the mold through a sprue in the injection mold， the sprue bush is to seal tightly against the nozzle of the injection barrel of the molding machine and to allow molten plastic to flow from the barrel into the mold， also known as cavity. 塑料树脂通过注塑模具的浇道进入模具
7、，浇口套密封紧接在注塑机注射料筒的喷嘴处，让熔化的塑料从料筒流到模具，也就是型腔。,Trapped air in the mold can escape through air vents that are grinded into the parting line of the mold. If the trapped air is not allowed to escape， it is compressed by the pressure of the incoming material and is squeezed into the corners of the cavity， wh
8、ere it prevents filling and causes other defects as well. 模具里积存的空气可以通过模具分型线的通风口排出。如果积存的空气不能排出，进料的压力会把它们挤压到型腔的角落，这会妨碍填充并导致其他问题。,New Words： injection mold 注塑模具 mold cavity 模具型腔 injection ram 注射活塞 clamping force 锁模力 beryllium-copper alloy 铍-铜合金 Electrical Discharge Machining process 电火花加工 sprue bush 浇口
9、套 runner /5rQnE(r)/ n.流道 trapped /trApt/ adj.堵塞的,Lesson 5 Three -plate Injection Mold,Three -plate injection molds are injection molds possessing two parting lines， having been designed as degating molds. This means that the sprue is separated from the parts in the mold. 三板式注射模具是具有两个分型面的注射模具，这种模具带有浇
10、口，也就是直浇道在模具中和塑件相分离。,At the conclusion of injection the mold opens at the first parting line， which contains the sprue and runner and separated the pinpoint gate from the part. Only when the second parting line opened， the part would be released. 在注射结束后，模具沿第一层分型面开模，其中包含了注入口、浇道和 塑件中分流的针孔型浇口。仅当沿第二层分型面开
11、模时，塑件才脱离型芯。,New Words： three -plate injection mold 三板式注射模具 sprue n .注入口，直浇道 pinpoint n .针孔型浇口 stop n .止动销，制动销，限位器 retention system 滞留系统 ejector plate 顶料板 protruding rod 凸出杆，伸出杆 star -shaped runner 星形流道 sprue separating area 浇道分离面 sprue -stripping plate 注料口分模板 stripping n .脱模，拆模,Lesson 6 Feed System,
12、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 removed from the flow way itself in the process of extracting the molding. 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，以及取出塑件时从进料通道中一同取出的浇注系统凝料。,As the temperatur
13、e of molten plastic is lowered while going through the sprue and runner， the viscosity will rise; therefore， the viscosity is lowered by shear heat generated when going through the gate to fill the cavity. 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，然而当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。,A sprue is a channel through whic
14、h to transfer molten plastic injected from the nozzle of the injector into the mold. A runner is a channel that guides molten plastic into the cavity of a mold. A gate is an entrance through which molten plastic enters the cavity. 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。分流道是引导熔融塑料进入模具型腔的通道。浇口是熔融塑料进入型腔的入口。,The pur
15、pose of the cold slug well， shown opposite the sprue， is theoretically to receive the material that has chilled at the front of the nozzle during the cooling and ejection phase. 冷料井正对着主流道。理论上，冷料井的作用是用来储存在塑件冷却和推出过程中注塑机喷嘴处形成的熔体前锋冷料。,New Words： flowway 进料通道 nozzle /5nCzl/ n.喷嘴 branch runner 分流道 injector /in5dVektE/ n.注射器 solidify /sE5lidifai/ vt.(使)凝固，(使)固化 backflow /bAkflEu/ n.逆流，流向来源 cold slug well 冷料井 chilled /tFild/ adj.已冷的，冷硬了的,Lesson 7 Mold Cavities and Cores,We then proceeded to indicate alternative ways by which the cavity and core could be incorporated into t
