有关机械的英语论文.pptVIP

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 a