机械制造技术基础课件-chapter3-section5-2012.ppt
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1、3.5 Clamping of the workpieceIn order to secure the workpiece in the located position whilst under the action of the cutting force, inertial force and gravity force, a clamping device must be incorporated into jigs and fixtures. As the machining quality and production efficiency are directly related
2、 to the clamping device design and selection, therefore, the following requirements must be ensured in clamping device design, namely: accurate ,rapid, secure and solid clamping, easy and light handling, simple structure and easy manufacturing.2022/6/252022/6/251 1SCUTSCUT2022/6/25SCUT2ConcernConcer
3、n:ClampingClamping force force Force magnitude Force magnitude Clamping direction Clamping direction Clamping position Clamping position Three importantThree important aspects aspects 2022/6/253SCUT3.5.1 The clamping direction 3.5.1 The clamping direction In detail, the following three aspects shoul
4、d be taken into account: (1)When two or more than two surfaces are used as the location datum, if the workpiece is large, the clamping force should be directed towards each of the location datum faces so as to keep the correct position of the workpiece; If the workpiece is small, as well as the cutt
5、ing force , the clamping force only needs to be directed towards the main support surface so as to ensure that there is enough contact area between the main datum surface and the location elements, and thereafter, to make sure the workpiece is stable and clamped safely.2022/6/252022/6/254 4SCUTSCUT(
6、2 2)The The clamping clamping direction direction should should be be easy easy for for setup setup and and to to get get a a low low clamping force. clamping force. Fig.3-5-1 Fig.3-5-1 shows shows some some combined combined relationships relationships between between the the clamping clamping forc
7、e, force, gravity gravity and the cutting force and the cutting force Question: which one needs the least clamping force?Question: which one needs the least clamping force?Fig.3-5-1Fig.3-5-12022/6/252022/6/255 5SCUTSCUT(3 3)The clamping direction should be chosen to reduce the clamping The clamping
8、direction should be chosen to reduce the clamping deformation of the workpiece deformation of the workpiece As the workpiece may have different stiffnesses in different directions, the clamping deformation may also be different under different clamping directions. Fig.(a) shows that a three jaw chuc
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