热工作英语.pptVIP

书名：热加工专业英语 第2版 ISBN： 978-7-111-49332-7 作者：王晓江 出版社：机械工业出版社 本书配有电子课件;热加工专业英语教案陕西工业职业技术学院材料成形教研室;Chapter Two Unit 10 The Cupola;教学思路设计 时间分配（共100min）： 1、讲解课文中的专业词汇和术语； 2、讲解课后生词、大声朗读； 3、翻译课文，注意穿插相关专业知识； 4、分析难点句型，讲解相关语法和翻译技巧； 5、学生答疑。;Contents;New Words;10. retard vt. 延迟，使减速，阻止，妨碍，阻碍 11. limestone n. 石灰石 12. fluorspar n. 氟石(= fluorite) 13. proprietary adj. 专有的，所有的；n. 所有人，所有权 14. tuyere n. （冲天炉）风口，风嘴 15. hearth n. 炉膛，炉床，炉缸 16. seep v. 渗出，渗漏;Phrases and Expressions;Text ; The cupola is simple and economical for melting pig and scrap iron. It is essentially a vertical steel shrouded and refractory-lined furnace. A view of the construction of a typical cupola is in Fig.2-10-1. Cupolas are made in many sizes, commonly about 1 to 2m in outside diameter and 9 to over 12m high. These sizes may turn out 5 to 10 metric tons of melted metal per hour.;Fig.2-10-1 External and internal views of a cupola; A cupola must be prepared and heated carefully to avoid damage. The refractory lining is repaired or replaced as needed, and the bottom doors are propped shut. A layer of sand sloping toward the tap hole is rammed over the bottom. Excelsior, rags, and wood are placed on the sand to protect it from the initial charge of fuel, which may be a meter or more thick, and to ignite the fuel. Materials are charged through a door 4 to 8m above the bottom.;低硫焦炭;出铁口; Flow may be permitted at intervals or may be continuous during the melt. For the latter case, the melting rate must be in balance with the capacity of the tap hole. The slag floats on top of the metal. If the molten metal is allowed to accumulate in the hearth, the slag flows off through an opening higher than the tap hole, called the cinder notch, in the back of the cupola. Otherwise, the slag may be skimmed off the metal as it flows out of the cupola. When sufficient metal has been melted, the bottom of the cupola is dropped to spill the remaining contents onto the ground to cool.