机械设计 Machine design.pdfVIP

1，The course briefly introduces the basic knowledge about the design of a whole machine, it mainly discusses the basic design theories and methods of common parts such as key, spline(花 键), bolt(螺栓), pin(销钉), worm(蜗杆), belt, shaft, slipping bearing （滑动轴承）, roll bearing （滚 动轴承）and so on. 2 ，零件part ，部件part，构件component 。机构mechanism，机器machine 4, The main process of mechanical design: 1) basic theoretical analysis about the mechanisms movement. 2) movement and the dynamic calculation 3) the calculation of parts’ working ability and strength 4) Draw assembly drawing and parts diagram 5) finish technical document of design Design principle 1) Strength principle: the stress that parts is acted on should not excess what it is permitted.2) Rigidity principle 3) working life principle 4) stability principle 5) Reliability principle. 5，The parts ofen under varying stress become invalidated briefly because of fatigue. （变应力下零件的实效主要是疲劳失效）（具体的校验计算公式） 6,Types of screw thread coupling 1) 螺栓bolt coupling (普通螺 栓 Ordinary bolt 和铰制孔用 螺栓articulation hole bolt) 2) 双头螺柱double-head bolt 3) 螺钉screw 4 ）紧定螺钉 set screw  Forces analysis of bolt coupling 1) transverse force 横向载荷 2) torque 转矩 3) longitudinal load 纵向载荷 1）普通螺栓组联接：不滑移，则要fF i K F / z ；（F0 单个螺栓的预紧力Pre-tight force ；