There is much more to casting than selecting a process and making the appropriate pattern During the past decade ,research and production experiences have provided scientific principles for better casting techniques Important considerations are the rate at which a mold cavity is filled ,gate placement ,riser design ,the use of chill blocks, and padding
铸造并不仅仅是选择工艺流程和合适的模型。在过去十几年间,对铸造业的研究和生产经验的总结已经使得铸造工艺越来越科学。着重集中在型腔如何灌注,进模口的布置,冒口的设计,冷硬试件的使用,垫模这些方面。
FILLING THE MOLD CAVITY the velocity with which the molten metal fills the mold is determined by the cross-sectional area of the gating system and the mold-pouring rate Too slow a mold-pouring rate means solidification before filling some parts, allowing surface oxidation Too high a pouring rate caused by too large a gating system causes sand inclusions by erosion ,particularly in green-sand molding ,and turbulence The minimum cross section in the gating system is called a choke In the strict sense, the choke is the section in the gating system where the cross-sectional area times the potential linear velocity is at a minimum When the gate system is choked at the bottom of the sprue ,it is called a nonpressurized system This system is somewhat less reliable than a pressurized system in which the choke is at the gate
充型的过程,
金属液的充填速度其实是取决于浇注系统的横截面积和浇注速率的。浇注速度太慢的话会使得金属液到达某些部分之前出现凝固(冷隔?),而这又将导致表面氧化。由于浇筑口大而使浇注速度过快的话又会出现砂眼(尤其是湿砂造型的时候)和紊流。浇注系统中横截面积最小的那个被称为阻塞面(choke不知道是不是这样译),严格意义上来讲,阻塞面应当是液流线速度最小的那个面。如果浇注系统在浇注口的底部进行阻塞的话,这就是一个开放式浇注系统。这种系统的可靠性比那种阻塞面设置在浇口的增压铸造系统稍差。
The first metal in the pouring basin and down the sprue usually has some turbulence that carries slag into the runner To avoid slag in the casting, the runner should extend past the last gate to trap the initial slag By the time the gate become operative, the liquid level should be high enough so that no slag can enter the casting cavity The runner should be laid out to minimize turbulence, that is it should be as straight and as smooth as possible The gate that was shown in Fig7-3 is made to enter the cavity at the parting line Gating arrangements may also be made at the top or bottom of the cavity The parting line gate is the easiest for the pattern maker to make; however, the metal drops into the cavity, which may cause some erosion of the sand and some turbulence of the metal For nonferrous metals, this drop aggravates the dross and entraps air in the metal
Top-gating is used for simple designs in gray iron, but not for nonferrous alloys, since excessive dross would be formed by the agitation
Bottom-gating provides a smooth flow of metal into the mold However ,if does have the disadvantage of an unfavorable temperature gradient It cools as it rises, resulting in cold metal in the riser and hot metal at the gate
浇池中的第一种金属浇入的时候通常都会产生一些带熔渣的紊流。为了避免这种熔渣,浇道必须延伸过浇口以限制熔渣。当浇口处于工作时,液面必须具有足够的高度以防止熔渣进入型腔。浇道必须设置为尽量减少紊流的样式,亦即尽可能的直和平滑。图7-3中所示浇口即为从分型线进入型腔。浇口也可以设计在型腔的顶部或是底部。而分型线浇口则是最易于模具制造商制造的;尽管如此,金属液流入型腔的时候还是会带来砂子的侵蚀和紊流。对于有色金属,这种流入使得浮渣和带入空气的现象更严重了。顶注式浇筑系统用于一些简单的灰口铁浇注设计,并不适用于有色金属,因为过多的搅动会带来额外的浮渣。而底注式浇口虽然提供了一个平滑的液流,但是会产生温度梯度——这恰恰是我们不愿意见到的缺陷。当其不断上升的时候会冷却,导致冒口过冷,浇口过热。
时间仓促见谅
"机器"这个中文词汇的英文是 "machine",发音为 /məˈʃiːn/。
发音
"machine" 的发音分为几个音节,其中重音在第二个音节上,每个音节的发音如下:
第一个音节:/mə/,发音类似于 "muh"。
第二个音节:/ˈʃiːn/,发音类似于 "sheen",重音在第二个音节上。
词性和含义
"machine" 是一个名词,意思是机器或者设备。它通常用于描述能够执行特定功能的物理装置,包括机械设备、电子设备、计算机和其他自动化设备。例如:
The factory has a lot of machines for making products(工厂有很多制造产品的机器。)
My computer is a very powerful machine(我的电脑是一台非常强大的计算机。)
The washing machine is broken and needs to be fixed(洗衣机坏了,需要修理。)
衍生词汇
"machine" 这个单词在英语中还有一些相关的衍生词汇,例如:
machinery:机械设备,指一系列的机器和设备。
machinist:机械师,指从事机械制造和维修工作的人。
machine tool:机床,指用于加工金属和其他硬质材料的机器。
machine learning:机器学习,指一种人工智能技术
问题一:"专业制造商"的英文怎么拼 Professional manufacturer
问题二:汽车制造商用英语怎么说 automan
望采纳!
问题三:生产厂家,用英文怎么说啊 manufacturer 一般用这个
factory 这个也可以
望采纳~
问题四:厂商公司和经销商公司,用英文怎么说 厂商公司
Manufacturer Company
经销商公司
Distributor Company
问题五:生产厂家用英文怎么说 a professional manufacturer
问题六:中国制造用英文怎么说? Made in China是最简洁最常见的表示法
问题七:生产厂家用英语怎么说,要缩写的。 Manufacturer 生产厂家好象没什么缩写哦,哦,有的话,哪就是单词的第一字母加起来
问题八:制造 加工 用英文怎么说? manufacture process
问题九:联合制造用英文怎么说 联合制造
[网络] Joint manufacturing;
[例句]土耳其 、伊斯坦布尔市、伊斯坦布尔大学、及ARTI联合制造了这部科学研讨性的影片。
The Turkish Federal Government, City of Istanbul, University of Istanbul, Case Productions and ARTI cooperated to film this practical, scientific test
问题十:一个制造商的厂名怎么用英语翻译 金得来首饰机械产业制造
意思是“由金得恭首饰机械产业制造的吗?”还是“金得来首饰机械产业制造厂?”
由金得来首饰机械产业制造 Manufactured by Jindelai Jewelry Equipments Industry
金得来首饰机械产业制造厂 Jindelai Jewelry Equipments Industrial Manufacturer
欢迎分享,转载请注明来源:浪漫分享网
评论列表(0条)