圈上洋文大学 Classifications of Cam Mechanisms Type of Joint Closure ⑧Force closed cams Follower Half joint require an external force to keep the cam in contact Cam Spring with the follower A spring usually supplies this force Half joint Cam haa四4 02 Spring Follower- 圈上清支大学 Classifications of Cam Mechanisms Type of Joint Closure Form closed cams are closed by joint geometry Slot milled out of the cam Half joint Follower Conjugate 2 4 Track cr goove Cam ME371 Design Manufacturing ll 6
6 ME371 Design & Manufacturing II Type of Joint Closure Force closed cams require an external force to keep the cam in contact with the follower A spring usually supplies this force Classifications of Cam Mechanisms ME371 Design & Manufacturing II Form closed cams are closed by joint geometry Slot milled out of the cam Type of Joint Closure Classifications of Cam Mechanisms
国 上游充通大￥ Classifications of Cam Mechanisms Surface of contact Roller Mushroom Flat-Faced Follower Follower Follower V follower Follower Follower Follower Spring Spring Spring Cam Cam cam cam ME371 Design Manufacturing ll 圈上泽庆大坐 Classifications of Cam Mechanisms Path of the motion of the follower Radial,offset or Axia D Radial follower offset follower Axial Cam 对心凸轮 偏置凸轮 ME371 Design Manufacturing ll 7
7 ME371 Design & Manufacturing II Roller Follower Mushroom Follower Flat-Faced Follower Flat-Faced Follower Mushroom Follower Roller Follower Surface of contact Classifications of Cam Mechanisms ME371 Design & Manufacturing II Radial, offset or Axial Radial follower offset follower 对心凸轮 偏置凸轮 Axial Cam Classifications of Cam Mechanisms Path of the motion of the follower
圈上游通大￥ Classifications of Cam Mechanisms Type of the cam (c)Cam v ced tollowe d Com with sphencal 仍Cam with offset faced follower. follower. disc cam cylindrical or barrel 盘型 圆柱凸轮 国 上泽充通大警 Cams from the industry 8
8 Type of the cam Classifications of Cam Mechanisms disc cam cylindrical or barrel 盘型 圆柱凸轮 Cams from the industry
图 上活大等 Cam Design Procedure ©Type Synthesis Selection of cam and follower type based on basic motion requirements Geometric,environmental,and economic considerations ©Follower Motion: from timing diagram->motion program · Based on specified rise,return,dwell Dimensional Synthesis of Cam Profile ."Wrapping around"follower profile onto cam ©Analysis Pressure Angle,Radius of Curvature,Dimensional Constraints... ME371 Design Manufacturing ll 国 上净文通大学 Cam Design Procedure Selection of cam and follower type Type Synthesis based on basic motion requirements Geometric.environmental.and economic considerations Follower Motion Based on specified rise,return,dwell Dimensional Wrapping around' follower profile Synthesis onto cam Analysis Pressure Angle,Radius of Curvature,Dimensional Constraints. 9
9 ME371 Design & Manufacturing II Cam Design Procedure Type Synthesis • Selection of cam and follower type based on basic motion requirements • Geometric, environmental, and economic considerations Follower Motion: from timing diagram->motion program • Based on specified rise, return, dwell Dimensional Synthesis of Cam Profile • “Wrapping around” follower profile onto cam Analysis • Pressure Angle, Radius of Curvature, Dimensional Constraints... Cam Design Procedure • Selection of cam and follower type based on basic motion requirements • Geometric, environmental, and economic considerations • Based on specified rise, return, dwell • “Wrapping around” follower profile onto cam • Pressure Angle, Radius of Curvature, Dimensional Constraints... Type Synthesis Follower Motion Dimensional Synthesis Analysis
® 上浒充通大￥ 5 3 7177n777 3 77 国 上泽文大粤 Motion mm or in High dwell 1 Low dwell Rise Fall 0 0 90 180 270 360 Cam angle日deg 0 0.25 0.50 0.75 1.0 Time t sec timing diagram-运动时序/运动循环图 10
10 timing diagram-运动时序/运动循环图