AMF Catalogue Hydraulic clamping systems Page 215
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CONtrOLLiNg thE CL ampiNg sEquENCE: prEssurE rEduCtiON OF thE CL ampiNg the sequence of supports and clamps must be controlled ELEmENts: time-dependent or pressure-dependent. this can be the pressure in the clamping circuit is reduced with a pressure performed by sequence valves 6918, 6918-X X-X X X or by control seat valve 6917. sequence valve 6918-80-10. clamping element support element suppOrtiNg FOrCE: the permissible loading force of support elements must always be regulated so that the clamping force of the clamping elements used and the static and dynamic machining forces can be absorbed safely. Permissible loading force minus clamping force minus safety reserve results in the possible machining force. if the total number of occuring forces exceeds the permissible loading force, the anchor of the support element will be pressed backwards thereby damaging the support element. the suppor ting force should always be at least twice as high as the clamping force. COmbiNatiONs OF suppOrt ELEmENt With sWiNg CL amp Example of suppor t element 6964H-04-1 and swing clamp 6952E-02-21 min. operating pressure [bar] ma x. operating pressure [bar] ma x. suppor ting force [kn] suppor t element 50 350 4,4 - swing clamp 40 350 - 2,0 ma x. clamping force [kn] perm. loading force = 4,4 kn minus clamping force = 2,0 kn arithmetic machining force ≤ 2,4 kn perm. machining force ma x. ≤ 2,0 kn NOtE: the permissible supporting forces in the diagram are static. Vibrations Supporting force (kN) pOssibLE maChiNiNg FOrCE at 350 bar: occuring during the machining could be far higher. For these cases, a large reserve must be included. Operating pressure (bar) sEt sCrEWs: Support elements must never be operated without set screws, since penetrating dirt and cooling water impair the function. most support elements are fitted with a set screw as standard. When using special set screws, make sure that the set screws are tempered Self-produced pressure screw and designed slightly ball-shaped. Set screws with a tip or fluting should not be used. Special set screws can jeopardise the function of return stroke of the support pin and the spring-loaded system. During in-house production, please manufacture according to our specifications. Piston Subject to technical alterations. ANDREAS MAIER GmbH & Co. kg ∙ Phone: +49 711 5766-196 ∙ Web: www.amf.de Hydraulic clamping systems 215
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