AMF Catalogue Hydraulic clamping systems Sida 6
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important and interesting facts rECOmmENdatiONs aNd paramEtErs OF OiL-hydrauLiC dEViCEs aNd pLaNts. gENEr aL: all parameters are published in accordance with the Din regulations. OiL rECOmmENdatiON: oil temperature (°c) 0 –40 10 –50 designation to Din 51 524 Hl, HlP 22 or HlPD 22 Hl, HlP 32 or HlPD 32 viscosity to Din iSo 3448 iSo Vg 22 iSo Vg 32 CL ampiNg ELEmENts: Pressure range: at continuous pressures below 80 bar, this must be stated on ordering as a dif ferent seal combination may need to be selected. ambient temperature: -10°c to +60°c thermal expansion: if thermal expansion is prevented in a hydraulic system, the pressure rises by about 10 bar per 1 °c temperature increase. Such conditions require overpressure protection. Seals: > > > > > o-rings made of nBr or Pu Supporting rings made of PtFE Flange seals made of PtFE, nBr, Pu or cu glydring made of PtFE or Pu Scraper ring made of Pu or nBr at higher ambient temperatures, clamping elements have to be equipped with heat-resistant seals (Viton® or similar). these are available upon request. mounting position: as desired, unless otherwise specified. Piston radial force: the piston radial force must never exceed 5% of the nominal cylinder force. Stroke speed: 0.01 – 0.5 m/s (for swing clamps, always observe the specifications!). leakage rate: Dynamic = up to 32 mm piston dia.: < 0.3 cm³ per 1000 double strokes and 10 mm stroke (HlP 22) from 40 mm piston dia.: < 0.6 cm³ per 1000 double strokes and 10 mm stroke (HlP 22) Static = no leakage rate FOr yOur saFEt y: to avoid injuries, a ma ximum distance of 4 mm (in accordance with Din En iSo 13857, part 1) between workpiece and clamping element must not be exceeded. to ensure safe clamping, clamping elements must be positioned in such a way that a residual stroke remains in the clamping cylinder af ter clamping. hOsE CONNECtiONs: When using high-pressure hoses, the following must be observed: > ma ximum operating pressure > bending radius > tightening torque of cap nut > dynamic or static use > environmental influences > the date for the permissible duration of use pipEs: Seamless steel pipe, phosphatised and oiled, dia. 8x2 mm, in accordance with Din En 10305. Pipes must be kept as short as possible, especially when used with single-action cylinders. Pipe bends must be made to the largest possible radius. CONNECtiNg thrEads: Whitworth pipe thread, X-type threaded bore in accordance with Din 3852, page 2. Seal by means of sealing edge. Do not use teflon tape or additional sealing compound. statiC prEssurE iN hydr auLiC systEm: cylinders, valves or lines and couplings create internal friction. an oil pressure of approx. 2 bar is required to overcome this static pressure. For single-acting cylinders with return springs, the static pressure must be reduced by keeping the supply line as short as possible and using piston rods with the smallest possible mass. ma x. permissible back pressure for unclamping must not be exceeded. the counter-pressure in the return flow should not exceed 0.5 bar. For double-acting elements, static pressures increases when load is applied to the rod side. Parts of the relatively large oil volume on the piston side cannot drain quickly enough. Static pressure does usually not af fect the clamping elements. COmmissiONiNg aNd maiNtENaNCE: > use only clean hydraulic oil of the specified type. > observe all instructions and information provided in mounting instructions before commissioning! > Vent the hydraulic system at low operating pressure at the highest point until the fluid is free of bubbles. Hydraulic directional valves are very sensitive to soiling and contamination. contamination and soiling of the pressure medium must be avoided. an oil change every six months is recommended. the oil level in the pressure generator must be checked regularly. Subject to technical alterations. 6 Hydraulic clamping systems ANDREAS MAIER GmbH & Co. kg ∙ Phone: +49 711 5766-196 ∙ Web: www.amf.de
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