专业夹具设计全英文介绍.ppt
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1、专业夹具设计全英文介绍,思诚机电,2,Good Fixture Design,Good fixtures position, clamp and support workpieces in the most effective way possible,3,Fixture design, workpiece Example 1,4,Fixture design, process,5,Datum,Fixture design, workpiece datums,6,Fixture design, supporting,7,Fixture design, positioning,8,Fixture
2、 design, clamping,9,Fixture design, additional support and clamping,10,Fixture, positioning, supporting and clamping,11,Fixture design, workpiece, Example 2,12,Fixture design, process,13,Fixture design, supporting,14,Fixture design, clamping,X,X,15,Fixture design, clamping,16,Fixture design, positio
3、ning and clamping,17,Fixture design, positioning, supporting & clamping,18,Friction clamping,If clamping using friction only it must be remembered that the coefficient of friction () is normally calculated at 0.1,Total clamping force = F,19,Friction clamping,If clamping using friction only it must b
4、e remembered that the coefficient of friction () is normally calculated at 0.1 This can be improved on soft materials (eg. Al) if the clamping piston has enough force to penetrate the workpiece,20,Fixture design,DEFINITION OF A CLAMPING FORCE The force acting on a workpiece to be clamped, is large e
5、nough to hold the workpiece firmly in its given position relative to the cutting tool, against the action of the machining forces,21,Fixture design,CLAMPING FORCES Mechanical low cost, relatively low forces Pneumatic higher cost, relatively low forces, large components Hydraulic higher initial cost,
6、 high forces, reliable, small components,22,Mechanical Forces,Maximum clamping force using standard wrench,Clamping force (kN),Clamping force with extension pieces as shown, 500N torque, = 0.1,23,Standard clamping strap M20 thread Max. recommended torque 223Nm Max. clamping force 28kN,Hydraulic swin
7、g clamp 6951F-11-21 (page 63, metric catalogue) 22 rod, 76mm long arm Max. oil pressure 23 MPa Clamping force 7.3kN,Force comparison,24,Force comparison,Standard clamping strap M20 thread Max. recommended torque 223Nm Max. clamping force 28kN,Hydraulic swing clamp 6951F-11-21 (page 63, metric catalo
8、gue) 22 rod, clamping strap Max. oil pressure 35 MPa Clamping force 13.7kN,25,Standard clamping strap M24 thread Max. recommended torque 383Nm Max. clamping force 40kN,Hydraulic swing clamp 6951FN-33-21 (page 71, metric catalogue) 38 rod, clamping strap Max. oil pressure 35 MPa Clamping force 35kN,F
9、orce comparison,26,Standard clamping strap M24 thread Max. recommended torque 383Nm Max. clamping force 40kN,Hollow piston cylinder 6921-100x10 (page 26, metric catalogue) M24 thread Max. oil pressure 400 bar Clamping force 101kN,Force comparison,27,Mechanical or Hydraulic ?,28,Mechanical or Hydraul
10、ic ?,29,Force diagram,30,Component & Fixture design,SENSIBLE USE OF FORCE Sensible introduction of positioning, clamping and supporting forces will enhance the quality of a workpiece,31,Oil supply to fixtures,2 basic methods through pipes through gun drilled channels Method depends on cost target co
11、mplexity of fixture products being used,32,Oil supply to fixtures, cost comparison,A:Through pipes using flange type clamps B:Through pipes using threaded type clamps C:Through gun drilled channels & manifold mounted type clamps D:Through gun drilled channels & threaded body type clamps,33,Oil suppl
12、y to fixtures, cost comparison,A: Through pipes using flange type clamps Relatively easy to manufacture Fittings weakest part of system Chip traps Control fixture COST 100%,34,Oil supply to fixtures, cost comparison,B: Through pipes using threaded type clamps Less swarf traps Reduces machining area
13、Fittings weakest part of system COST ?% against control fixture,35,Oil supply to fixtures, cost comparison,C: Through gun drilled channels & manifold mounted type clamps Maximum component density Minimum swarf traps COST ?% against control fixture,36,Oil supply to fixtures, cost comparison,D: Throug
14、h gun drilled channels & threaded body type clamps Maximum component density Minimum swarf traps COST ?% against control fixture,37,Oil supply to fixtures, cost comparison,C: Through gun drilled channels & manifold mounted type clamps 98%,Hydraulic circuit design,39,Circuit design,40,Cam Cover fixtu
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