机电工程专业英语.ppt

CONTENTS,● Lesson 1 Introduction to Machinery Design ● Lesson 2 Mechanisms ● Lesson 3 Machine Parts (I) ● Lesson 4 Machine Parts (II) ● Lesson 5 Engineering Graphic in the Third- angle Projection ● Lesson 6 Introduction to CAD/CAM/CAPP ● Lesson 7 A Discussion on Modern Design Optimization ● Lesson 8 Using Dynamic Simulation in the Development of Construction Machinery ● Lesson 9 Engineering Tolerance ● Lesson 10 Numerical Control,,,,,,,,,,● Lesson 11 Introduction to Heat Pipe Technology in Machining Process ● Lesson 12 Introduction to Material Forming ● Lesson 13 Material Forming Processes ● Lesson 14 Introduction to Mould ● Lesson 15 Mould Design and Manufacturing ● Lesson 16 Heat Treatment of Metal ● Lesson 17 Virtual Manufacturing ● Lesson 18 Fluid and Hydraulic System ● Lesson 19 Product Test and Quality Control ● Lesson 20 Introduction of Automobile Engine,,,,,,,,,,● Lesson 21 The Automobile Components ● Lesson 22 Mechatronics ● Lesson 23 Industrial Robots ● Lesson 24 An Army of Small Robots ● Lesson 25 Introduction to MEMS ● Lesson 26 Dialogue—At CIMT ● Lesson 27 Virtual Manufacturing,,,,,,,,,,● Lesson 1 Introduction to Machinery Design●1.1 Text[1]Machinery design is either to formulate an engineering plan for the satisfaction of a specified need or to solve an engineering problem. It involves a range of disciplines in materials, mechanics, heat, flow, control, electronics and production.,,,,,,,,,,,Machinery Components The major part of a machine is the mechanical system. [3]And the mechanical system is decomposed into mechanisms, which can be further decomposed into mechanical components. In this sense, the mechanical components are the fundamental elements of machinery. On the whole, mechanical components can be classified as universal and special components. Bolts, gear, and chains are the typical examples of the universal components, which can be used extensively in different machines across various industrial sectors.,,,,,,,,,Mechanical Design Process Product design requires much research and development. Many concepts of an idea must be studied, tried, refined, and then either used or discarded. Although the content of each engineering problem is unique, the designers follow the similar process to solve the problems. The complete process is often outlined as in Fig.1.1.,,Fig.1.1 Design Process Model,,,,,,,,,Recognition of Need Sometimes, design begins when a designer recognizes a need and decides to do something about it. The need is often not evident at all; recognition is usually triggered by a particular adverse circumstance or a set of random circumstances, which arise almost simultaneously. Identification of need usually consists of an undefined and vague problem statement.,,,,,,,,,Definition of Problem Definition of problem is necessary to fully define and understand the problem, after which it is possible to restate the goal in a more reasonable and realistic way than the original problem statement. Definition of the problem must include all the specifications for the thing that is to be designed. Obvious items in the specifications are the speeds, feeds, temperature limitations, maximum range, expected variation in the variables, and dimensional and weight limitations.,,,,,,,,,Synthesis The synthesis is one in which as many alternative possible design approaches are sought, usually without regard for their value or quality. This is also sometimes called the ideation and invention step in which the largest possible number of creative solutions is generated. The synthesis activity includes the specification of material, addition of geometric features, and inclusion of greater dimensional detail to the aggregate design.,,,,,,,,,Analysis Analysis is a method of determining or describing the nature of something by separating it into its parts. In the process the elements, or nature of the design, are analyzed to determine the fit between the proposed design and the original design goals.,,,,,,,,,Evaluation Evaluation is the final proof of a successful design and usually involves the testing of a prototype in the laboratory. Here we wish to discover if the design really satisfies the needs. The above description may give an erroneous impression that this process can be accomplished in a linear fashion as listed. On the contrary, iteration is required within the entire process, moving from any step back to any previous step.,,,,,,,,,Presentation Communicating the design to others is the finial, vital presentation step in the design process. Basically, there are only three means of communication. These are the written, the oral, and the graphical forms. A successful engineer will be technically competent and versatile in all three forms of communication. The competent engineer should not be afraid of the possibility of not succeeding in a presentation. In fact, the greatest gains are obtained by those willing to risk defeat.,。