机械设计基础a3第一节课

1、MACHINE DESIGNInstructor：刘 莹 (Design Institute, PIM)Tel：6279.5122-603（o） Room:3410 Building:9003E-mail: Section OneIntroduction Introduction1.Machine Design and its process（过程）2.Recognized Standard for Machine Design puters in Machine Design4.Makings（素质） of the Engineers5. Profile（概览） of “Machine De

2、sign” Course6. How Can You Study the Course Efficiently7. Evaluation（评价） of Your Performance（成绩）1.Machine Design and its process Its the first step of product manufacture. It attempts to go from theory into practice for the purpose of developing products and processes needed by customers. Machine De

3、sign can be:1) Creative Design（开发性设计）: New principle（原理） and New Structure 点阵击打式打印机Principle of Laser printer2) Adjustability （适应性） Design: Same principle and Mechanism（原理）, just add some functions, then some structure should be odated to the change（适应这种变化）. Design of shell of cell phone providing e

4、arphoneThe hole for earphone3) Transformative（变形） Design: Same principle、mechanism and structure, just adjust some parameters（参数） to satisfy the customers. Bicycles:28”26”20”Process of Machine DesignIdentification ProblemMechanism DesignTechnical Design Working Out Technical FilesTrail Manufacture（试

5、制）,Test, Appraisement(评价）, ProducingFeedback、ModificationMechanism Design of Stamp Machine2.Recognized Standard for Machine DesignHierarchical （等级）StandardISOGBJB、YB QUnit（单位）Bolts（螺栓）, Nuts（螺母）, Rolling Bearing（滚动轴承）, Coupling（联轴器） JB/T 7919.1-1999 Rolling bearing -AccessoriesWithdrawal sleeves 滚动轴

6、承附件 退卸衬套 Only being used in the company“三化”标准化、通用化和系列化 puters in Machine Design1) Computer-aided design (CAD) It is application of computer technology to planning, performing（做）implementing（实现） the process. Manufactures can minimize design cost, maximum efficiency, improve quality, reduce developmen

7、t time, and maintain an edge in domestic（国内） and international（国际） markets. 2) Rapid prototyping Parts from computer geometry description files can be produced in hours or even minutes. Its helpful to visualization（可视化） design and rapid detection of design errors. Please get more information from th

8、e reference2、3.3) Finite element analysis (FEA) It is the most prevalent computational method for solid and fluid mechanical analysis.站立状态下足部受力计算4.Makings(素质） of a fine mechanical designer1) To Be Sensitive（敏感的）2) To Be creative（创新的）3) To be practical（实践的）4) To be wise（博学的） 5) To concern yourself wi

9、th government policy（国家政策）1) To Be Sensitive，in order to find the consumers needThe experiment results by using different pliers（钳子）Percent of suffering persons(%)week2) To Be creative, in order to win in the market competitionTraditional typeNew invention3) To be practical, in order to try new idea

10、s efficientlyTry to make or test new production by yourself4) To be wise , in order to give more ideas to the determinate problem Print principleWord modeLattice(点阵式） modepinSpray-inklaserHeat-sensitivity5) To concern yourself with govern- mental policy, in order to be sure you make a practicable de

11、sign5.Profile of “Machine Design” Course1) Characters of the courseFoundation course（基础课程） to learn machine designFocus on the basic methods（基本方法） of machine elements structure and working performance design Machine elementscurrent elements（通用零部件）2) Objects（目标） of the courseTo grasp（掌握） the design m

12、ethod and principles of general machine element, then you can design mechanical transmission（传动） system or a simple mechanical instrument（装置）.To know where you can find the useful information for design work, such as handbooks, standards and website.To motivate（激发） the consciousness（意识） of creation.

13、To understand the relative national policy, the trend of mechanical industry in order to make your design work be practicable. Basic information of machine design(chapter1,2,3)Performance and structure design of the elements using in mechanical transmission system:Chapter6gearsChapter7worm gearsChap

14、ter5beltsChapter9rolling bearingsShafts( in Chapter2) and slide bearings (in Chapter3)Fasteners( 连接紧固件）Chapter11)3) Contents（内容） of the course6.How Can You Study the Course EfficientlyKeep in mind the characteristics of engineering problems(1)No correct answer, only feasible（可行的） answermulti- soluti

15、ons to one problem.(2)A multitude（多的） considerations is involved in most engineering designing.(3)Former（以前的） experiences are helpful.Try you best to do more exercises and be innovative（创新的） You listen, you forget; you read , you remember; you do, you learn; you learn ,you innovate.Major categories

16、of design considerationsTraditional considerations 1) Materials2) Geometry3) Operating conditions4) Cost5) Availability6) Producibility7) Components lifeModern considerations 1) Safety2) Ecology(生态学）3) Quality of lifeMiscellaneous Considerations1) Reliability and maintainabilty2) Ergonomics（人类工程学） a

17、nd aesthetics（美学）Lift truck designed for functional, attractive, and unique appearance with low costTeaching activitiesLectures 2) Seminar 3) Experimentation Presentation 5）Homework 6) Quiz in the class 7) Final examinationGrade calculationreferences7. Evaluation of Your PerformanceSeminar( behaviou

18、r and report) 10%Experimentation 10%Presentation ( behaviour and report) 10%Homework and quiz 10%Final examination 60%Topics of presentationTopic1. 根据你的经历和发现来描述两个从安全（或人性化、经济性、维护性、环保等）角度作的最好的生活用机械产品设计（绘制该结构的草图）。（请从机械设计师的角度来阐述）Topic2. 根据你的经历和发现来描述一个从安全（或人性化、经济性、维护性、环保等）角度作的最不好的生活用机械产品设计（绘制该结构的草图） 。（请从机械设计师的角度来阐述）以上两个主题中仅选一个角度进行分析Topics of presentationTopic3. 分别找出一个生活中带传动、链传动应用的实例（绘制结构草图），分析二者的异同。（如：系统组成、布置方式、传递动力的能力、传动的特