AMF Catalogue Hydraulic clamping systems Page 47
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hollow rod Cylinder No. 6921 Hollow Rod Cylinder single acting, spring return, max. operating pressure 400 bar. CAD Article no. push-pull force at 100 bar [kN] push-pull force at 400 bar [kN] Stroke H Vol. effective piston area [mm] [cm³] [cm²] [N] [g] 63768 6921-70x6 17,8 71 6 11 18,5 700 1675 63149 6921-100x10 24,4 101 10 26 25,9 1500 4800 Order no. Spring force min. Weight Design: Cylinder barrel from steel, burnished. Piston and piston rod case hardened and ground. Retraction by disc springs. 1 wiper. Piston rod with internal thread and two flats (size 70 x 6) or hexagon (size 100 x 10). Built-in sintered bronze filter. Oil supply via threaded port. Application: When workpieces are clamped onto a machine tool table, the hollow rod cylinder can be screwed onto the clamp bolt and be joined to the clamp by the two threads in the body. Also suitable for holding and clamping devices directly on a machine tool table. The hollow rod cylinder is designed for use in combination with tempered bolts of material grade 8.8 for size 100x10 and material grade 12.9 for the size 70x6. In case bolts of material grade 8.8 and grade 10.9 are used the pressure has to be reduced for size 70x6 for continuous operation (see diagramme). Features: Protected against contamination and chips by a wiper. High forces in a small design. Note: For single acting cylinders there is risk of sucking in coolant during the return stroke. In this case the cylinders have to be protected against the direct effect of coolant. The built in sinter metal breather should be protected. Dimensions: Order no. Article no. Piston dia. [mm] A B dia. C dia. D E F G M8 K L M R S 13 65 M16 G1/4 SW22 63768 6921-70x6 55 58 10 16,5 75 26 50 63149 6921-100x10 70 85 10 25,0 100 56 70 M10 16 97 M24 G1/4 SW36 Application example: 6921 baseplate grooved table 6972F Clamping pressure p [bar] adjustement options The shown hydraulic clamping device shows casts of several sizes that are clamped by hydraulic pull-down clamp no. 6972F and pull-down counterpart no. 6977. To obtain an efficient means of adjustment, 2 base plates are each equipped with 6 hydraulic nuts no. 6921 which are connected to the grooved table via bolts for T-nut according to DIN 787. The adjustment of the base plate and the clamping of the workpiece can be performed independently by a pump unit with 2 clamping circuits. Clamping force F [kN] Diagram for size 70x6: 6977 Longterm reliability diagram for clamping bolts M16 according to DIN 787, ISO 4762, ISO 4014 and grades 8.8, 10.9, 12.9 Number of clamping cycles Subject to technical alterations. ANDREAS MAIER GmbH & Co. kg ∙ Phone: +49 711 5766-196 ∙ Web: www.amf.de Hydraulic clamping systems 47
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