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1、有关机械的英语论文Rises冒口n Rises are designed and placed so as to ensure filling the cavity during solidification.n 冒口的设计及放置等,以确保加油站腔凝固过程。冒口的设计及放置等,以确保加油站腔凝固过程。n They also art to relieve gas pressure in the mold and to reduce pressure on the lifting surfaces of the mold.n 他们还采取行动,以纾缓气体压力,在模具,并减少压他们还采取行动,以纾缓气
2、体压力,在模具,并减少压力解除表面的霉菌。力解除表面的霉菌。n n The volume of metal in the riser should be sufficient to retain heat long enough to feed the shrinkage ncavity and equalize the temperature in the mold,avoidingncasting strains.n 体积的金属在冒口应足以保持热量,只要够养活缩口和平衡温度的体积的金属在冒口应足以保持热量,只要够养活缩口和平衡温度的模具,避免铸造株。模具,避免铸造株。n The riser
3、 requirements vary with the type of metal being poured.n 该冒口要求都会有所不同,同类型的金属被浇。该冒口要求都会有所不同,同类型的金属被浇。n Gray case iron,for example,needs less feeding than some alloys because a period of graphieization occures during the final stages of solidification whichncauses an expansion that tends to counteract
4、the metal nshrinlege.n 灰铸铁,例如,需求不足喂养比一些合金的,因为一个时期的石墨灰铸铁,例如,需求不足喂养比一些合金的,因为一个时期的石墨化过程中发生的最后阶段的凝固,引起群众的扩展趋于抵消金属的收化过程中发生的最后阶段的凝固,引起群众的扩展趋于抵消金属的收缩缩n Many nonferrous metals requires elaborate feeding that tends to counteract the casting .n 许多有色金属的要求阐述喂养趋于抗衡铸造。许多有色金属的要求阐述喂养趋于抗衡铸造。n Two riser designs for t
5、he same casting are shown in Fig.7-4n 两个冒口设计,同时铸造示于图两个冒口设计,同时铸造示于图 7-4 。n Rises are placed near the heavy sections of the casting.n 冒口放在附近重型路段铸件。冒口放在附近重型路段铸件。n The feed metal must be located above the highestnpoint of the casting.n 饲料中的金属必须设以上的最高点,该点的铸件。饲料中的金属必须设以上的最高点,该点的铸件。n Chill Blocks冷块n Chill
6、blocks are metal blocks placed in the mold for locaalized heat dissipation.n 冷块金属块放置在模具局部散热。冷块金属块放置在模具局部散热。n They may be placed at an interscation or joint wherenthere is a comparatively large volume of metal to cool,thus relieving a hot spot or maintaining a more nuniform cooling rate and better mi
7、crostructure.n 它们将被放置在一个路口或联合,有一个比较大体积的金属冷却,它们将被放置在一个路口或联合,有一个比较大体积的金属冷却,从而减轻的一个热点,还是维持一个较均匀冷却速度和更好的显微结从而减轻的一个热点,还是维持一个较均匀冷却速度和更好的显微结构。构。n They may also be placed at far surface of a mold,naway from a riser or sprue.n 它们也可能被置于远远表面的模具,使之远离,从冒口或浇道。它们也可能被置于远远表面的模具,使之远离,从冒口或浇道。n This will help the far e
8、nd of the mold to freezenrapidly,promoting directional solidification.n 这将有助于本月底至今的模具冻结迅速,促进定向凝这将有助于本月底至今的模具冻结迅速,促进定向凝固。固。n Chill blocks are also used at points where it is designable to have localized hardening,as in the case of bearings or wear surfaces.n 冷块也用于站后,这是设计性,以有局部硬化,在案冷块也用于站后,这是设计性,以有局部硬
9、化,在案件或轴承磨损表面。件或轴承磨损表面。Padding 轧染n Padding consists of adding to or building up ansection to obtain adequate feeding of isolated sections.n 填充选区添加或建设一节,以获得适当的喂养孤立的章节。填充选区添加或建设一节,以获得适当的喂养孤立的章节。n Fig.7-4 showed two methods of feeding the centralnand outside boss.n 图图 7-4 两种方法喂养,中央和境外老板。两种方法喂养,中央和境外老板。n
10、 Shown at(b)is the plan of using two risers and at(c)one riser with a pad.n 所示,在(乙),是计划用两立,并在(所示,在(乙),是计划用两立,并在(c)一冒口的一个跳板。)一冒口的一个跳板。n The second plan pprovides a yield of the 45%of the metal poured,compared to 30%when two risers are used。n第二个计划提供了一个产量的第二个计划提供了一个产量的45%的金属烧相比,的金属烧相比,30%的时候,两个的时候,两个上升
11、器使用。上升器使用。n n The feeding distance to the central hub is 4.5t,where t=the thickness of the feed path.n 饲距中心枢纽,是饲距中心枢纽,是4.5吨,其中吨,其中T=厚重饲料的道路。厚重饲料的道路。n By rule of thumb,the total thickness of pad and casting(at the pad location)should not be less than one-fifth of the metal-feeding distance.n 由经验法则,其总厚度的软垫及铸造(在垫板上的位由经验法则,其总厚度的软垫及铸造(在垫板上的位置),应不低于上就有五分之一的金属补缩距离。置),应不低于上就有五分之一的金属补缩距离。n This rule is not absolute but a good generalization.n 这一规则也不是绝对的,而是具有很好的推广。这一规则也不是绝对的,而是具有很好的推广。n