【導讀】結合畢業(yè)設計課題查找相關資料，完成翻譯。順，專業(yè)詞匯準確，編排符合規(guī)范和畢業(yè)設計相關要求。兩種木模以必要余量配合使。利用熔爐熔化鋁廢料，最后將熔融的金屬澆注到砂模內，便可以獲。在鑄件的清理工作完成之后，所得的兩個鑄件質量良好。根據(jù)鑄件的產(chǎn)量統(tǒng)計，在制動盤的工作過程中，是靠摩擦力來減慢車輪轉速或讓車輪停止轉動。由馬達驅動葉輪旋轉，將流體以中心向外以很高的加速度拋出。金屬鑄件是現(xiàn)代化的機器和運輸車輛的重要組成部分。造得到的金屬零件的比重超過百分之九十。在汽車發(fā)動機上，這一比例超過了百分。造制動盤和葉輪葉片，其成本并不是太昂貴，其尺寸精度也并不須太精確。合金的溫度范圍控制在450℃至680℃之間。高于其液體的溫度。因此，目前以發(fā)現(xiàn)超過270種不同的。鋁及其合金在航空航天工業(yè)和運輸建設等其他領域發(fā)揮了極其重要的作用。

　　

【正文】 aerospace industry and very important in other areas of transportation and building. Its reactive nature makes it useful as a catalyst or additive in chemical mixtures, including being used in ammonium nitrate explosives to enhance blast power. Furnace The furnace used for the melting of the aluminium scrap is the Man furnace, which makes use of diesel oil for burning. Methods Aluminium was melted in a crucible furnace, an oldest and simple type of melting equipment. It was poured after melting into the mould earlier prepared for the two patterns. No melting treatment was carried out prior to pouring operation. After the pouring and solidification is pleted, the two patterns were removed, cleaned and inspected for possible defects. Calculations Impeller Actual impeller diameter = 146mm, Shrinkage allowance used = 13mm/m, Machining allowance used 6mm. Diameter of pattern due to shrinkage = Impeller Diameter + (Shrinkage Allowance) (Impeller Diameter) = 146+ (13?146/1000) = 146 + 1898/1000 = 146 + = . Therefore, adding machining allowance, this diameter of the pattern bees Diameter of the pattern = Machine allowance + Diameter of pattern due to shrinkage = 6 + = . Brake disc Actual blade disc diameter = 260mm, Shrinkage allowance used = 13mm/m, Machining allowance used = 6mm. Diameter of the pattern due to shrinkage = Disc diameter + (Shrinkage allowance) (Brake disc Diameter) = 260 + (13?260/1000) = 260 +3380/1000 = 260 + = Adding machining allowance, thus diameter of the pattern bees Diameter of the pattern = Machine allowance + Diameter of pattern due to shrinkage = +6 = = 269 mm Casting Yields The casting can be evaluated using casting yield, which determines the percentage use of metal in casting. Casting Yield = WC/(WC + WG+WR) Where WC = Casting Weight, WG = Gating Weight, WR = Riser Weight. For the impeller, Casting Weight, WC = . Weight of gating and riser, WG + WR = . Casting Yield = (+) = ? 100 = % For the brake disc, Casting Weight = WC = Weight of gating and riser = Casting Yield = (+) = 2/ = ? 100= % Result and Discussion A casting free of defects can be obtained if the pattern is properly designed, the mould properly prepared and the melting and pouring processes correctly carried out. In this work, due to unavoidable errors, some defects were noticed on the cast impeller blade and the brake disc. Both the external and the internal surface of the casting were relatively rough pared with the degree of smoothness expected of the brake disc. However, the external surface was machined to obtain a higher degree of smoothness while for internal surface。 there was little or nothing which could be done to improve the smoothness. In the case of cast impeller, it was only the edge that was rough. A file was use used in filling the edges in order to smoothen it. Conclusion In the course of this work, effort was made to produce locally the impeller and brake disc from aluminum scraps and to ensure that they conform to specification required. The green sand mould prepared gave the rough surface of the two castings, this may be due to the fact that no additives were added or proper percentage position was not used. The defects found on the two casting may be due to entrapped air and poor surface finish of the mould, though the defects are minor. The cast yield for the impeller and the brake disc indicates that sound casting was achieved. References [1] Mikhailow A. M., Metal Casting, First edition Mir Publishers, Moscow, 1989. [2] Howard E. B., Timothy L. G., Metal Handbook, Desk edition, America Society for Metal (ASM) USA, 1992.