机械工程专业英语教程第2版l.ppt

Lesson 8 Threaded Fasteners,机械工程专业英语教程, 2019/5/5,1,Terminology Text tour,Terminology Stud 双头螺柱 Pitch Distance measured parallel to the axis from the point on one thread to the corresponding point on the adjacent thread 螺距：螺纹上两个相邻的对应的点之间的轴向距离,机械工程专业英语教程,2, 2019/5/5,Washer A flat disk, as of metal, plastic, rubber, or leather, placed beneath a nut or a joint to relieve friction, prevent leakage, or distribute pressure. 垫圈：用金属、塑料、橡胶或皮革等制的平的圆盘状物，放于螺帽下或连接处以减少摩擦，防止渗漏或均衡压力。,Washer 垫圈 Spring washer 弹簧垫圈,机械工程专业英语教程,3, 2019/5/5,ASTM 1. American Society for Testing Materials 美国材料试验学会; 2. American Standard of Testing Materials 美国材料试验标准; 3. American Standards of Test Manual 美国标准试验手册 SAE Society of Automotive Engineers (美国)汽车工程师学会,机械工程专业英语教程,4, 2019/5/5,Superalloy Any of several complex temperature-resistant alloys 超级合金：几种耐热合金的一种 Monel A trademark used for an alloy of nickel, copper, iron, and manganese. This trademark sometimes occurs in print in lowercase. 蒙耐尔合金：一种镍、铜、铁和镁合金的商标。这一商标在印刷中有时以小写出现。,机械工程专业英语教程,5, 2019/5/5,Text tour Threaded fasteners perform the function of locating, clamping, adjusting, and transmitting force from one machine member to another.1 They are thoroughly standardized and generally designed for use in mass production of machines. 1. threaded fastener 意为“螺纹紧固件”。全句可译为： 螺纹紧固件起着定位、夹紧、调整和从一个机器零件向另一个传递力的作用。,机械工程专业英语教程,6, 2019/5/5,A threaded fastener is a device that can effectively exert and maintain a large force in one direction (axially) through the application of a small force in another direction (tangentially). All are based on the single-threaded screw, a simple machine that yields a large mechanical advantage in minimal space and theoretically is self-locking.2 2. mechanical advantage 意为“机械效益，机械增益”。全句可译为： 所有这些都是基于单头螺纹螺钉的，它是一个简单机械，可以在最小的空间内产生很大的机械效益，而且在理论上是自锁的。,机械工程专业英语教程,7, 2019/5/5,Unified standard thread is available in three basic series of diameter-pitch combinations.3 The coarse-thread series (UNC) is most common and is recommended for general assembly use where vibration is not a problem and where frequent disassembly is required. 3. diameter-pitch combination 意为“直径螺距组合”。全句可译为： 统一标准螺纹有三个基本系列的直径螺距组合。,机械工程专业英语教程,8, 2019/5/5,Washers are often used with threaded fasteners to provide a better bearing surface for nuts and bolt heads,4 to provide a bearing surface over large clearance holes or slots, to distribute the load over a larger area, to prevent marring of parts during assembly, to improve torque-tension ratio (by reducing friction), and to provide locking, in some cases through spring action. 4. bearing surface 意为“支撑面”。全句可译为： 垫片经常被与螺纹紧固件一同使用，为螺帽和螺栓头提供更好的支撑面。,机械工程专业英语教程,9, 2019/5/5,Flat washers are thin, annular-shaped disks used primarily for bearing surface and load distribution and have no locking capability. Conical spring washers are made of hardened and tempered steel that is slightly dished.5 Conical washers deform when the bolt is tightened and act as springs that compensate for small losses in bolt tension due to thermal expansion or compression set of the gaskets. 5. conical spring washer 意为“锥形弹簧垫圈”。全句可译为： 锥形弹簧圈是由淬火后又经回火处理的钢制成的，它的形状稍微有一点像碟子。,机械工程专业英语教程,10, 2019/5/5,A particular SAE grade specification can be met by a number of different steels. Thus fastener manufacturers have some latitude in selecting the materials best suited to their specific production facilities.6 6. production facility 意为“生产设备”。全句可译为： 这样，紧固件生产厂家可以在一定的范围内选择最适合他们特定的生产设备的材料。 In addition to carbon steels, many stainless steel alloys are used for threaded fasteners where improved corrosion resistance is required. Austenitic stainless steels