AMF Catalogue Hydraulic clamping systems Page 255
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prEssurE rEduCtiON OF thE CL ampiNg CONtrOLLiNg thE CL ampiNg sEquENCE: the sequence of supports and clamps must be controlled ELEmENts: time-dependent or pressure-dependent. this can be done the pressure in the clamping circuit is reduced with a pressure using a sequence valve 6918 or supply valve 6918-80-10. control seat valve 6917. 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 LiNk CL amp Example of suppor t element 6944kH-04-2 and link clamp 6942kk-32 with standard clamping arm min. operating pressure [bar] ma x. operating pressure [bar] ma x. suppor ting force [kn] clamping force at 70 bar [kn] clamping force at 38 bar [kn] suppor t element 25 70 4,0 - - link clamp 15 100 - 3,71 2,0 perm. loading force = 4,0 kn minus clamping force = 2,0 kn arithmetic machining force ≤ 2,0 kn perm. machining force ma x. ≤ 2,0 kn NOtE: the clamping pressure for the link clamp 6942kk must be reduced to Supporting force (kN) pOssibLE maChiNiNg FOrCE at 70 bar: approx. 38 bar. the permissible supporting forces in the diagram are static. Vibrations 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 255
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