Program summary SWING CLAMPS - Römheld GmbH Friedrichshütte - #6

High alloy steel, nitrated or chromium-plated

Casehardening steel, nitrated

By nitrating piston and body, wear is reduced and protection against corrosion increased.

The swing motion must not be impeded and the clamping arm may only contact the work-piece after completion of the swing stroke.

Dimensions without tolerance data corres­pond to the general tolerances in accord­ance with DIN ISO 2768 -mH.

Fittings suitable for the Whitworth G tube thread correspond to DIN 2353, screwed plug type B according to DIN 3852 Sheet 2 (with sealing edge or soft seal).

Important: No additional sealing materials, such as Teflon ribbon, must be used!

In swing clamps with overload protection device the swing mechanism is protected against damages due to a collision of the clamping arm for example with the workpiece. Snapping out of the overload protection device stops the swing motion of the clam­ping arm. However the complete stroke of the swing clamp will be effected.

If the overload protection device snapped out, the swing clamp has to be moved back to the off-position and the piston with the clamping arm has to be snapped in by hand. The swing clamps without overload protection device and with reinforced swing mechanism main­tain their angular position of the clamping arm during loading and unloading, even in case of a slight collision with the clamping arm. The reinforced swing mechanism endures a colli­sion of the clamping arm with the workpiece during clamping up to a pressure of 100 bar

Less critical are the weight of the clamping arm or an increased swing speed.

• NBR = nitrile-butadiene rubber Trade name e.g.: Perbunan Operating temperature:-30 up to +100°C

• FKM = fluor caoutchouc Trade name e.g.: VITON® Operating temperature:-20 up to +150°C

ROEMHELD swing clamps do not leak oil when static.

During displacement of the piston a residual lubricating film will be tolerated with regard to the life of sealings and guides. Admissible leakage rates for 1,000 double strokes and hydraulic oil HLP 22 are:

- up to 32 mm piston diameter: < 0.30 cm³

- from 40 mm piston diameter: < 0.60 cm³

For one-sided clamping arms the maximum admissible operating pressure depends on the length of the clamping arm. The values are indicated in the diagrams on the corres­ponding data sheets.

If a double clamping arm or a clamping strap is used, the complete operating pressure can be used.

Air in the oil prolongs the clamping time con­siderably and leads to function troubles. Therefore bleeding has to be effected during start up.

The admissible flow rate has to be kept to avoid overload, increased wear and malfunc­tions of the swing clamp.

Throttling has to be made in the oil supply line to the swing clamp to rule out a possible pressure intensification. Use only flow control valves which allow oil return from the swing clamp without any impediments.

During unclamping the admissible oil flow rate can obtain a higher value, since the piston area is correspondingly bigger.

Hydraulic clamping elements can generate considerable forces. Due to the swing motion, the exact clamping and unclamping position cannot be determined in advance. Considera­ble injuries can be caused to fingers in the effective area of the clamping arm.

Remedy: protection device with electrical locking.

If there is a possibility that aggressive cutting lubricants and coolants penetrate through the sintered metal air filter into the cylinder's inte­rior, a vent hose has to be connected and be placed in a protected position. For further notes and provisions see data sheet A 0.100.

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Römheld GmbH

Friedrichshütte

Römheldstraße 1-5 35321 Laubach, Germany Tel.: +49 (0) 6405/89-0 Fax: +49 (0) 6405/89-211 E-mail: info@roemheld.de www.roemheld.com

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