机械设计制造及其自动化专业英语unit1-3,5-7,4 - 图文

Unit 1 Metals

金属

The use of metals has always been a key factor 在人类社会的发展中，金属的应用起着关键性的in the development of the social systems of man. Of 作用。构成物质的大约100种基本元素中，大约有一半为金the roughly 100 basic elements of which all matter 属。金属和非金属之间的区别不是特别明显。最基本的定义is composed, about half are classified as metals. The 集中在元素原子间存在的连接形式和与这些原子相关联的distinction between a metal and a nonmetal is not 电子的某些特性。然而，在实际应用中，可以将具有某些特always clear-cut. The most basic definition centers 性集合金属定义为某种元素。 around the type of bonding existing between the atoms of the element, and around the characteristics of certain of the electrons associated with these atoms. In a more practical way, however, a metal can be defined as an element which has a particular package of properties. ------------------------------------------- -------------------------------------------- 除了少数例外金属在常温下是固态的。它们是热Metals are crystalline when in the solid state and, with few exceptions (e.g. mercury), are solid 和电的良导体，不透光。它们往往具有较高的密度。许多金at ambient temperatures. They are good conductors of 属具有延展性，也就是说，在不被破坏的情况下它们的形状heat and electricity and are opaque to light. They 在外力的作用下可以发生变化。引起永久变形所需的力和最usually have a comparatively high density. Many 终使金属断裂所需的力相当大，尽管发生断裂所需的力远没metals are ductile-that is, their shape can be 有像所预期的撕开金属原子所需的力那么大。 changed permanently by the application of a force without breaking. The forces required to cause this deformation and those required to break or fracture a metal are comparatively high, although, the fracture forces is not nearly as high as would be expected from simple consideration of the forces required to tear apart the atoms of the metal. 从我们的观点来看，在所有的特性中结晶性是最重要------------------------------------------------- ------------------------------------------------- One of the more significant of these characteristics from our point of view is that of 的。结晶体是这样一种结构，组成它的原子定位在规则的三crystallinity. A crystalline solid is one in which 维排列中，仿佛位于三维棋盘的方格的角上。原子间距随着the constituent atoms are located in a regular 原子大小呈规律性变化，原子间距是金属的一种特性。三维three-dimensional array as if they were located at 排列的轴线决定了晶体在空间中的方向。在工程实践中应用the corners of the squares of a three-dimensional 的金属由大量的晶体组成，这些晶体称之为晶粒。在大多数chessboard. The spacing of the atoms in the array is 情况下，晶粒在空间中是自由排列的。在原子范围内，晶粒of the same order as the size of the atoms, the actual 之间相互接触紧密结合。晶粒之间连接区域被称为晶界。 spacing being a characteristic of the particular metal. The directions of the axes of the array define the orientation of the crystal in space. The metals commonly used in engineering practice are composed of a large number of such crystals, called grains. In the most general case, the crystals of the various grains are randomly oriented in space. The grains are everywhere in intimate contact with one another and joined together on an atomic scale. The region at which they join is known as a grain boundary. 绝对纯净的金属从来也没有被生产出来过。即使绝对------------------------------------------------- ------------------------------------------------- An absolutely pure metal (i.e. one composed of only one type of atom) has never been produced. 纯净的金属可以生产出来，工程师们对它们也并不会特别感Engineers would not be particularly interested in 兴趣，因为它们很柔软、脆弱。实际应用中的金属往往都包such a metal even if it were to be produced, because 含着一定数量的一种或多种外来金属或非金属元素，这些外it would be soft and weak. The metals used 来元素可能是有害的也可能是有益的或者它们对某种特定commercially inevitably contain small amounts of one 的属性没有影响。如果是有害的，这些外来元素被认为是杂or more foreign elements, either metallic or 质。如果是有益的，它们被认为是合金元素。在工程材料中nonmetallic. These foreign elements may be 往往被特意地加入一定数量的合金元素。得到的物质被叫做detrimental, they may be beneficial, or they may have 合金。 no influence at all on a particular property. If disadvantageous, the foreign elements tend to be known as impurities. If advantageous, they tend to be known as alloying elements. Alloying elements are commonly added deliberately in substantial amounts in engineering materials. The result is known as an alloy. The distinction between the descriptors 金属和合金区别不大。金属这个词可以包括工业用纯------------------------------------------------- ------------------------------------------------- “metal” and “alloy” is not clear-cut. The term 金属和它的合金。也许可以这样说，合金元素越故意的被添“metal” may be used to encompass both a 加，被添加的合金元素的量越大，那么生产出来的产品越倾commercially pure metal and its alloys. Perhaps it 向于被称之为合金。不管怎样，如果想使一种金属或合金在can be said that the more deliberately an alloying 使用中表现出稳定一致的特性，在其中添加何种化学成分，addition has been made and the larger the amount of 它的量多大都应该在控制范围之内。因此，当想了解决定金the addition, the more likely it is that the product 属和合金性质的因素时，应充分考虑它们的化学组成。 will specifically be called an alloy. In any event, the chemical composition of a metal or an alloy must be known and controlled within certain limits if consistent performance is to be achieved in service. Thus chemical composition has to be taken into account when developing an understanding of the factors which determine the properties of metals and their alloys. ------------------------------------------------- ------------------------------------------------- Of the 50 or so metallic elements, only a few 在50种左右的金属元素里，工程实践中只有少数金属are produced and used in large quantities in engineering practice. The most important by far is 被大量生产和使用。到目前为止最重要的是铁，以它为基础iron, on which are based the ubiquitous steels and 构成了处处可见的钢和铸铁。（主要由铁和碳构成的合金）cast irons (basically alloys of iron and carbon). 它们的重量占所有生产出来的金属重量的98%。在结构应用They account for about 98% by weight of all metals （也就是说，可以承受载荷的结构）中居于其次位置的是铝、produced. Next in importance for structural uses 铜、镍和钛。在所有的金属产量中，铝占0.8％，铜占0.7％，(that is, for structures that are expected to carry 剩下的占0.5％。剩下的金属用于相对特殊的用途。例如，loads) are aluminum, copper, nickel, and titanium. 镍合金主要用于抗磨损和耐高温的用途，由于钛合金具有高Aluminum accounts for about 0.8% by weight of all 强度和低密度的综合特性，钛被广泛应用于航空工业中。镍metals produced, and copper about 0.7%, leaving only 合钛有高成本和高质量的使用特性，事实上，它们高的成本0.5% for all other metals. As might be expected, the 限制了它们的应用。 remainders are all used in rather special applications. For example, nickel alloys are used principally in corrosion-and heat-resistant applications, while titanium is used extensively in the aerospace industry because its alloys have good combinations of high strength and low density. Both nickel and titanium are used in high-cost, high-quality applications, and, indeed, it is their high cost that tends to restrict their application. ------------------------------------------------- ------------------------------------------------- We cannot discuss these more esoteric 我们不能在这里讨论这些深奥的特性。在合金材料被properties here. Suffice it to say that a whole complex of properties in addition to structural 采用和应用于工程实际之前，掌握其结构强度和它的综合性strength is required of an alloy before it will be 质就够了。举例来说，它可以强度很高，并且有好的耐磨性；accepted into, and survive in, engineering practice. 它可以被例如拉伸加工，机械加工，或焊接等特殊工艺来加It may, for example, have to be strong and yet have 工出来；它可以被循环利用；它的成本和实用性是首要的。 reasonable corrosion resistance; it may have to be able to be fabricated by a particular process such as deep drawing, machining, or welding; it may have to be readily recyclable; and its cost and availability may be of critical importance.

Unit 2 Selection of Construction Materials

工程材料的选择

There is not a great difference between “this” steel and 在钢之间没有太大的区别；所有的钢在机“that” steel; all are very similar in mechanical properties. 械性能方面都是近似的。它们的选取标准是Selection must be made on factors such as hardenability, price, and 诸如脆硬性，价格，和可用性等。不仅仅是availability, and not with the idea that “this” steel can do 因为这种钢含有2％的合金元素另一种钢含something no other can do because it contains 2 percent instead of 有1％而使前者具有了后者没有的某些能力，1 percent of a certain alloying element, or because it has a 或者是某种钢具有神奇的名字。经过热处理mysterious(神秘的，不可思议的) name. A tremendous range of 后，任何一种钢都具有大范围的特性；这种properties is available in any steel after heat treatment; this is 性质同样在合金钢中存在。 particularly true of alloy steels. Considerations in fabrication(制造) The properties of the final part (hardness, strength, and 关于加工的考虑 最后零件的特性（硬度、强度和可加工性）machinability), rather than properties required by forging, govern 而不是锻造特性决定了材料的选择。可锻性the selection of material. The properties required for forging have 与材料的最后特性联系不大；因此，提高金very little relation to the final properties of the material; 属的可锻造性价值不大。高碳钢很难锻造。therefore, not much can be done to improve its forgeability. 如果在随后的热处理过程进行细化，大尺寸Higher-carbon steel is difficult to forge. Large grain size is best 晶粒是最好的。 if subsequent heat treatment will refine the grain size. Low-carbon, nickel-chromium(铬) steels are just about as 在高温下低碳，镍铬合金钢在受到plastic at high temperature under a single 520-ft·lb(1 520-ft·lb的冲击下表现出与相同碳含量普ft·lb=1.35582J) blow as plain steels of similar carbon content. 通钢几乎同样的塑性。镍减少了中碳钢的可Nickel decreases forgeability of medium-carbon steels, but has 锻性，但对低碳钢影响不大。铬在锻造温度little effect on low-carbon steels. Chromium seems to harden steel 下时使钢硬化，但钒没有明显的效果；两种at forging temperatures, but vanadium(钒) has no discernible(可辨别的) effect; neither has the method of manufacture any effect on high-carbon steel. 加工方法对高碳钢没有影响。 Formability The cold-formability of steel is a function(功能) of its tensile point must not be high or too much work will be required in bending（弯曲）; likewise（同样地）, the steel must have sufficient（充成形 钢的冷成形是它的拉伸强度和延展性相则在发生弯曲时需要做很多工作；与之相类似，钢应该有高延展性，使其在没有断裂的strength combined with ductility. The tensile strength and yield 结合的结果。拉伸强度和屈服点不能太高否足的） ductility to flow to the required shape without cracking. 情况下成形。加工力的大小取决于屈服点，The force required depends on the yield point, because deformation 因为钢在屈服点之上才开始变形。与此同时，starts in the plastic range above the yield point of steel. 加工硬化也同时发生，金属变得越来越硬，Work-hardening also occurs here, progressively（日益增多地） 增加加工难度，尤其在低碳钢中容易发生。 stiffening（使变硬） the metal and causing difficulty, particularly（独特的，显著的） in the low-carbon steels. It is quite interesting in this connection（关于这一点，就此operation that could not possibly be done leisurely（缓慢地，从it may be necessary to anneal（退火） before proceeding, that is在这方面，相当有趣的是你将发现有时可方式两三次加载却不能实现。如果拉伸进行火，也就是说工件是否有时间进行加工硬化。而论） to discover that deep draws can sometimes be made in one rapid 通过一次快速加载完成大拉伸，但以缓慢的容不迫地） in two or three. If a draw is half made and then stopped, 了一半就停止了，那么在再加工之前应先退（换句话说）, if the piece is given time to work-harden. This may 这不是一种科学的叙述方法，但确实是发生not be a scientific statement, but it is actually what seems to 了。 happen. Internal stresses Cold forming is done above the yield point in the work-hardening 内应力 在高于屈服点的加工硬化区进行冷加工range, so internal stresses can be built up easily. Evidence of this 很容易产生内应力。例如工件停止成型加工is the springback（回弹） as the work leaves the forming operation 后会发生回弹，在随后的热处理后，工件会and the warpage（翘曲，扭曲） in any（任何一种） subsequent heat 发生翘曲。即使是一个简单的垫圈，由于打treatment. Even a simple washer might, by virtue of(依靠) the 孔和随后的平整加工中产生内应力，也会在internal stresses resulting from punching（冲压） and then 热处理中呈现严重的翘曲。 flattening（整平）, warp（弯曲） severely（严格地，激烈地） during heat treating. （virtue n.德行, 美德, 贞操, 优点, 功效, 效力, 英勇 believed in the virtue of prayer.相信祈祷的力量 When doubt exists as to（关于） whether internal stresses will 当是否内应力会引起翘曲的怀疑存在时，cause warpage, a piece can be checked by heating it to about 1100 可以通过将工件加工至1100然后进行冷却来and then letting it cool. If there are internal stresses, the piece 验证。如果存在内应力，工件会发生变形。is likely to（可能） deform. Pieces that will warp severely while 经过热处理的工件像我们看到的那样会发生being heated have been seen, yet （然而）the heat-treater was 严重的翘曲，但是我们仍然希望工件被扔到expected to put them through and bring them out better than they 热处理炉中被处理，这样好过它存在内应力were in the first place. Welding The maximum carbon content of plain carbon steel safe for welding 的状态。 焊接 不需要预热或之后进行热处理就能安全without preheating or subsequent heat treatment is 0.3%. 焊接的最高碳含量为0.3％。高碳钢通过合适higher-carbon steel is welded every day, but only with proper 的预热通常也可焊接。有两点值得注意：吸preheating. There are two important factors: the amount of heats 收热量的多少；移除速度。 that is put in ; the rate at which it is removed. Welding at a slower rate puts in more heat and heats a large 低速焊接带来了更多的热量，这对金属的volume of metal, so the cooling rate due to loss of heat to the base 大量体积进行了加热，所以冷却速度降低。metal is decreased(减少). A preheat will do the same thing. For 预热可以取得与之相当的效果。例如当 被example, sae4150 steel, preheated to 600 or 800, can be welded 预热至 或 时可以很好的焊接。由于周readily（容易地）. When the flame or arc is taken away from the weld, 围金属的较高温度，当焊接弧移开焊接点后，the cooling rate is not so great, owing to the higher temperature 冷却速度不会太快，产生了低速冷却的结果。of the surrounding metal and slower cooling results. Even the most 即使是冷作硬化速度最快的金属也可以通过rapid air-hardening（风硬钢） steels are weldable if preheated and 预热和慢速焊接达到良好的焊接效果。 welded at a slow rate. Machinability Machinability（机械加工性能） means several things. To 可加工性 可加工性意味着几件事情。对于加工者来production men it generally means being able to remove metal at the 说，它意味着可以快速的移除金属，取得最fastest rate, leave the best possible finish, and obtain the longest 好的加工效果，得到最长的刀具寿命。可加