ANALYSIS OF CLAMPING FORCES National （分析夹紧力的国家）.pdfVIP

1.Analysis of Clamping Force 2.Toggle Clamp 3.Cam operated Clamp 4.Screw Clamp ,Strap Clamp 5.Limts and Fits 6.Tolerance 7.Geometrical Deviations ANALYSIS OF CLAMPING FORCES CLAMPING FORCE WHAT IS A CLAMP ?  A clamp is a fastening device to hold or secure objects tightly together to prevent movements or seperationthrough the application of inward pressure. WHAT DOES IT DO ?  Clamping prevents the part from shifting or being pulled from the jig or fixture during the machining operation. SO WHAT IS CLAMPING FORCE ?  Clamping force is the force required to hold a part against the locators.  The type and amount of clamping force needed to hold a part is usually determined by tool forces working on the part and the way the part is positioned in the tool. Clamping pressure, as a general rule, should only be enough to hold the part against the locators. The locators should resist the bulk of the thrust. If a part must be clamped with a great deal of pressure, the tool should be redesigned so that tool thrust is directed at the locators and the tool body. In strap clamps if the fastener is When clamping single part, a better placed in the centre of the strap then placement is with one-third of strap half of the clamping forces are shared length equally. between the fastener and workpiece and two-thirds between the fastener and heel support. In this case two-third of the clamping force is applied to the workpiece. CLAMPING FORCE ANALYSIS OF TOGGLE CLAMP  The range of holding force that may be achieved with