AMF Catalogue Hydraulic clamping systems Page 320
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support control, pneumatic No. 6984-20 Order no. Support control, pneumatic CAD Weight OR-2 OR-1 Md max. Spring Spring force Input Article no. Stroke O-ring O-ring max. force min. max. pressure [g] Order No. Order No. [N] [N] [bar] [Nm] [mm] 562223 6984-20 6 1 - 12 5 4,3 20,7 559533 552174 26 Design: Housing made of steel, hardened and honed. Piston hardened and ground. Compression spring from stainless steel. O-rings and springs supplied as standard. Application: The support control is used in fixtures where a signal indicating a correctly supported workpiece is required to enable machining. Lightweight workpieces should be clamped before being pressurised with compressed air. A precise air flow upstream of the pressure transducer is required for ensuring correct operation of the support control. Features: The support control works like a pneumatic back-pressure nozzle. The position is extended from its initial position by a pressure spring. Once applied, the air jet flows through the piston and the radial vent hole on the support control housing to outside. The discharge hole is sealed as soon as a workpiece is mounted and the piston is pushed downwards by min. 1.5 mm. A clamping stroke of 2-3 mm is recommended. The air flow backs up, the internal air pressure rises. The pressure value must be transferred to the control by an appropriate pressure signal converter. The system is relatively insensitive to fine chips. Note: Installation dimensions: stroke switching stroke 1,5 The pressure signal converter is not included in the supply scope. Effective piston surface when nozzle is closed = 0.28 cm² Piston force = piston surface x air pressure + spring force The release pressure at the pressure signal must be set with an upstream volume flow control valve (e.g. throttle/check valve). Control air intake 1-12 bar. Observe max. tightening torque. After tightening, check that the piston moves smoothly. Loosen if necessary. Glue in the housing with screw lock (e.g. Loctite 638). vent hole control air 1-12 bar alternatively Application example: Hydraulic diagram: support control, pneumatic housing seal glued alternatively with screw lock control air seal pressure transducer spring Subject to technical alterations. 320 Hydraulic clamping systems ANDREAS MAIER GmbH & Co. kg ∙ Phone: +49 711 5766-196 ∙ Web: www.amf.de
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