有关机械的英语论.ppt

有关机械的英语论文,Rises 冒口,Rises are designed and placed so as to ensure filling the cavity during solidification. 冒口的设计及放置等，以确保加油站腔凝固过程。 They also art to relieve gas pressure in the mold and to reduce pressure on the lifting surfaces of the mold . 他们还采取行动，以纾缓气体压力，在模具，并减少压力解除表面的霉菌。,The volume of metal in the riser should be sufficient to retain heat long enough to feed the shrinkage cavity and equalize the temperature in the mold ,avoiding casting strains . 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。 The riser requirements vary with the type of metal being poured. 该冒口要求都会有所不同，同类型的金属被浇。 Gray case iron , for example, needs less feeding than some alloys because a period of graphieization occures during the final stages of solidification which causes an expansion that tends to counteract the metal shrinlege. 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缩,Many nonferrous metals requires elaborate feeding that tends to counteract the casting . 许多有色金属的要求阐述喂养趋于抗衡铸造。 Two riser designs for the same casting are shown in Fig.7-4 两个冒口设计，同时铸造示于图 7-4 。 Rises are placed near the heavy sections of the casting . 冒口放在附近重型路段铸件。 The feed metal must be located above the highest point of the casting . 饲料中的金属必须设以上的最高点，该点的铸件。,Chill Blocks 冷块,Chill blocks are metal blocks placed in the mold for locaalized heat dissipation . 冷块金属块放置在模具局部散热。 They may be placed at an interscation or joint where there is a comparatively large volume of metal to cool, thus relieving a hot spot or maintaining a more uniform cooling rate and better microstructure. 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构。 They may also be placed at far surface of a mold, away from a riser or sprue. 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。,This will help the far end of the mold to freeze rapidly ,promoting directional solidification . 这将有助于本月底至今的模具冻结迅速，促进定向凝固。 Chill blocks are also used at points where it is designable to have localized hardening, as in the case of bearings or wear surfaces. 冷块也用于站后，这是设计性，以有局部硬化，在案件或轴承磨损表面。,Padding 轧染,Padding consists of adding to or building up a section to obtain adequate feeding of isolated sections. 填充选区添加或建设一节，以获得适当的喂养孤立的章节。 Fig. 7-4 showed two methods of feeding the central and outside boss . 图 7-4 两种方法喂养，中央和境外老板。 Shown at (b) is the plan of using two risers and at (c) one riser with a pad . 所示，在（乙），是计划用两立，并在（c）一冒口的一个跳板。 The second plan pprovides a yield of the 45% of the metal poured, compared to 30% when two risers are used。 第二个计划提供了一个产量的45%的金属烧相比，30%的时候，两个上升器使用。,The feeding distance to the central hub is 4.5t,where t=the thickness of the feed path. 饲距中心枢纽，是4.5吨，其中T=厚重饲料的道路。 By rule of thumb , the total thickness of pad and casting (at the pad location )should not be less than one-fifth of the met