机电专业英语试卷B.doc

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Quiz of Part 2
Ⅰ. Translate the following words or phrases into Chinese or English.(2×10)
1. engine lathe __________________
2. _________________ 维修车间
3.point to point NC ________________________
4.____________________ 制造设备
5.automatic tool changing _________________
6.旋转加工______________________
7.regardless of __________________
8.__________________ 脆性工件
9.dislocation density _________________________
10._________________________ 晶粒生长

II. Fill in the blanks with the suitable words or phrases given below.(3×6)
is heated to A wide variety of be characterized as

several specialized names fill the cavity a later trimming process

Forging can 1 : mass conserving, solid state of work material (metal), and mechanical primary basic process-plastic deformation. 2 forging processes are used, and Fig.12-1 (a) shows the most common of these: drop forging. The metal 3 a suitable working temperature and placed in the lower die cavity. The upper die is then lowered so that the metal is forced to 4 . [1]Excess material is squeezed out between the die faces at the periphery as flash, which is removed in 5 . When the term forging is used, it usually means hot forging. Cold forging has 6 . The material loss in forging processes is usually quite small.

III. Translate the Chinese parts given in the brackets into English.(4×10)
1._________________________许多大型的车床配备在普通车间中通常看不到的附件）, such as automatic stops for the carriage.
2._____________________________________________（在通用车床上加工一个复杂的工件时）, a great deal of time is spent changing and adjusting the several tools that are needed to complete the work.
3.Point to point control system, also called positioning, are simpler than contouring control system．Its primary purpose is ________________________ ________________________ (移动刀具或工件从一个程序控制点到另一个控制点) .
4.Geometric instructions __________________________________________
_______________（用于定义刀具和工件之间的相对位置和运动）.
5.Modern machining centers have ________________ (非常有助于) improved productivity in many companies.
6.The workpiece is placed in a tank _______________________________（盛满液体介质）；a depth of at least 50 mm over the work surface is maintained to eliminate the risk of fire.
7.___________________________________________（高功率脉冲输出到工具和工件中）to produce the sparks responsible for material removal.
8.Work hardening can be ____________________________________
_______________________ (通过回复和再结晶的动态软化过程消除).
9.This low temperature treatment removes the residual stresses due to cold working ____________________________________（没有改变错位密度）is called recovery.
10.Flame cutting can be characterized as: mass reducing, solid state of work material, chemical primary basic process-_______________（燃烧）.

IV. Translate the following paragraphs. (20)
The generally accepted definition for heat treating metals and metal alloys is “heating and cooling a solid metal or alloy in a way so as to obtain specific conditions and/or properties.” Heating for the sole purpose of hot working(as in forging operations) is excluded from this definition．Likewise，the types of heat treatment that are sometimes used for products such as glass or plastics are also excluded from coverage by this definition．
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