英语翻译Injection molding machines are manufactured in many sizes.These are rated according to size by the amount of material which can be injected in one cycle,which ranges from a fraction of an ounce in the small laboratory models to many pound

英语翻译Injection molding machines are manufactured in many sizes.These are rated according to size by the amount of material which can be injected in one cycle,which ranges from a fraction of an ounce in the small laboratory models to many pound
英语翻译
Injection molding machines are manufactured in many sizes.These are rated according to size by the amount of material which can be injected in one cycle,which ranges from a fraction of an ounce in the small laboratory models to many pounds in large production equipment .Laboratory models are used in the research and development of new polymers and molding techniques.
There are two basic units to an injection molding machine; one for injecting the heated plastic and one for opening and closing the mold.The first unit includes a feed hopper,heated injection cylinder ,and an injection plunger or screw system.The second unit comprises a hydraulic operated moving platen and a stationary platen on which the halves of the mold are mounted.Injection molding machines are also available in vertical models.
There are many variations in injection molding machine design,however,the basic machines are of either the screw-ram,or plunger type.The main difference between these types is the method in which the plastic material is delivered from the hopper to the nozzle of the machine.Machines of the reciprocating-screw type are used more because of the material.
The injection molding machine has a variety of instrumentation used for the clamping unit,mold,and injection molding machine.Fig.2.1.1 shows the most important possibilities of the instrumentation.In fact ,there is no known direct method for in-line checking of the condition of the mold.
A typical laboratory injection molding machine,will vary in shot capacity from a few grams to about one-half ounce.It will have a clamping device that is usually hand operated with a cam action and an injection system operated manually or by compressed air.The injection system exerts very high pressure on the mold,from 5000 to 20000 psi.It is therefore necessary for the mold to be clamped together with a greater pressure than the injection pressure or the mold halves will be forced apart and flash(squeeze out of resin at the parting line of the mold)will result.
The loading chute and the heating cylinder make up the other major components of the machine.Most of the laboratory size machines are of the plunger type.
Injection molding is especially suitable for high production runs,most machines produce several thousand products an hour.Virtually all thermoplastic resins can be injection molded,however,some are more difficult to process and require specialized equipment.From a knowledge of polymer structure,it becomes evident that resins with wide melting range mold easier than those with a sharp or narrow melting point,Other factors to consider are the molding temperature requirements,moisture absorption of the resin,and the necessary properties required for the product.For example,acetal resin has a sharp melting point,turning quickly to a liquid,which requires exacting temperature controls.

英语翻译Injection molding machines are manufactured in many sizes.These are rated according to size by the amount of material which can be injected in one cycle,which ranges from a fraction of an ounce in the small laboratory models to many pound
注坯模型机器被制造在许多大小.这些是额定的根据大小由可能被注射在一个周期,范围从一盎司分数在小实验室模型对许多磅在大生产设备Laboratory 模型被使用在新聚合物和造型技术的研究与发展的相当数量材料.有二个基本的单位对注坯模型机器; 一为注射激昂的塑料和一个为开头和关闭模子.第一单位包括饲料跳跃者、激昂的射入圆筒,和射入柱塞或螺丝系统.第二个单位包括模子一半登上的一块水力被管理的移动的台板和一块固定式台板.注坯模型机器是还可利用的在垂直的模型.有在注坯模型机器设计上许多变化,然而,基本的机器是或螺丝公羊,或柱塞类型.主要区别在这些型之间是塑料材料被提供从跳跃者对机器的喷管的方法.交换螺丝类型的机器被使用更多由于材料.注坯模型机器有各种各样仪器工作被使用为夹紧的单位、模子,和注坯模型机器.Fig.2.1.1 显示仪器工作的最重要的可能性.实际上,没有已知的直接方法为线型检查模子的情况.一个典型的实验室注坯模型机器,将变化在被射击的容量从几克对大约二分之一盎司.它将有通常是手由压缩空气管理以凸轮行动和注射系统手工被管理或的一个夹紧的设备.注射系统施加非常高压在模子,从5000 到20000 psi .它比射入压力或模子一半分开将被强迫和flash(squeeze 在树脂外面在mold)will 结果的是因此必要为模子被夹紧与更加巨大的压力一起分开线.
问题补充:
装货滑道和热化圆筒组成其它主要组分机器.大多实验室大小机器是柱塞类型.注坯模型是特别适当的为高生产运行,多数机器产物几一千个产品每小时.实际上所有热塑性塑料的树脂可能是射入被铸造,然而,一些更难处理和要求专业设备.从聚合物结构知识,它变得显然,树脂以宽熔化的范围比那些铸造容易以一个锋利或狭窄的熔点,其它因素考虑是造型温度要求、树脂的湿气吸收,和必要的物产必需为产品.例如,缩醛树脂有一个锋利的熔点,迅速转向液体,要求横征暴敛的温度控制.
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