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FST Heavy Industry Forming Machines
Freudenberg Sealing Technologies Forming Machines

Heavy Machinery

Forming Machines

Keeping time with the machine

Sealing solutions for industrial presses and injection molding machines

Strong forces with moderate movements, extremely variable forward and return stroke speeds, extremely short strokes at a high number of cycles, in some cases under a continual load or with fast load changes – the operating conditions for seals in hydraulic cylinders for industrial presses and injection molding machines are diverse and always challenging. This requires technical excellence. The highest level of reliability is in demand. So are stick-slip-free performance and low operating costs.

Patented pressure relief

FST Merkel Omegat

One ingenious solution from Freudenberg Sealing Technologies is the Merkel Omegat primary seal with its patented pressure- relief function. Rapid forward strokes in combination with slow return strokes can build up considerable pressure in the cylinder and lead to a failure of the sealing system due to extrusion. In these cases, small borehole in the primary seal facilitates the return flow of fluid into the working chamber. This creates a pressure balance – small borehole, great effect!

PTFE counters poor lubrication

FST Merkel Omegat C104

Another example of Freudenberg Sealing Technologies' application know-how is the specially developed PTFE compound C104. Short strokes and high cycle counts produce deficient lubrication in the sealing system. The counterfaces beneath it can suffer. The costly consequences: the replacement of the seals and the guides, along with the rework of the housing and cylinder rods. Due to its outstanding anti-friction properties, this PTFE compound developed by Freudenberg Sealing Technologies behaves neutrally on the counterface even with poor lubrication. Thanks to its patented geometry, the matching Merkel Guivex guide ring promotes the moistening of the contact surface with lubricant.

Relevant products and applications in this market segment

FST Dynamische Dichtungen Dynamic Seals
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Dynamic Seals

Portfolio Freudenberg Sealing Technologies

Dynamic Seals
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Wipers

Wipers in pneumatic and hydraulic cylinders protect the interior of the cylinder from the penetration of external contaminants when the rod is retracted.

Dynamic Seals
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Rod Seals

Rod Seals are primarily used in pneumatic and hydraulic cylinders and have the task of sealing the incoming and outgoing cylinder rod.

Führungen
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Guide Rings

Guide Rings have the task of guiding the rods and pistons of pneumatic and hydraulic cylinders and preventing direct metallic contact with the cylinder housing.

FST Dynamische Dichtungen Dynamic Seals Dreh-/Schwenkdichtungen Pivoting Motion
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Rotary and Swivel Seals

It is the combination of operating conditions that put Rotary and Swivel Seals to the test. They must withstand pressure loads similar to those in hydraulic cylinders.

FST Dynamische Dichtungen Dynamic Seals Kolbendichtungen Piston Seals
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Piston Seals

Piston Seals in pneumatic and hydraulic cylinders have the task of sealing the piston against the cylinder tube.

FST Static Seals Statische Dichtungen
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Static Seals

Portfolio Freudenberg Sealing Technologies

FST Static Seals Statische Dichtungen O-Ringe O-rings
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O-Rings

Endless O-Rings with a circular cross-section: O-Rings are among the sealing classics par excellence.

FST Deckeldichtungen Cover Seals
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Cover Seals

Even if machine elements under pressure are firmly bolted to one another, there is still a so-called static seal gap that must be sealed.

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Sealing materials

The right seal material is crucial for continuous wood plate and finished blanking presses. It must be dry-run capable since a stable lubricating film does not form due to the short strokes.

The right seal material is crucial for continuous wood plate and finished blanking presses. It must be dry-run capable since a stable lubricating film does not form due to the short strokes. The counterface must not be damaged as a result of the defective lubrication. The PTFE glass MoS2 compound satisfies this requirement: in the form of the Merkel Omegat rod seal combined with the high-performance Merkel Guivex guide rings and the tried-and-tested double wiper Merkel PT 2.
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Harshest conditions

Sealing systems for compacting and scrap metal pressing must be robust and often bridge large metallic gaps.

Sealing systems for compacting and scrap metal pressing must be robust and often bridge large metallic gaps. The first choice is the Freudenberg Sealing Technologies V-packing sealing sets, which even resist scratching on piston rods.
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Protection against external influences

The pressure-relief Merkel Omegat primary seal, the tried-and-tested Merkel T 20 U-ring as the secondary seal, and Merkel Guivex guide rings are employed in the fields of forming, wooden plate, bending, stone and ceramic presses.

The pressure-relief Merkel Omegat primary seal, the tried-and-tested Merkel T 20 U-ring as the secondary seal, and Merkel Guivex guide rings are employed in the fields of forming, wooden plate, bending, stone and ceramic presses. This trio stands for large diameters, long strokes and high pressures. The double wiper Merkel PT 2 offers the greatest possible protection in case of dirt adhesion on rods, aggressive damping and radiant heat.
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Stable, long-term behavior

The Merkel Omegat PTFE seal comes into use as a main element in the sealing system for pressure pad cylinders. It compensates for large seal gaps.

The Merkel Omegat PTFE seal comes into use as a main element in the sealing system for pressure pad cylinders. It compensates for large seal gaps. Its massive supporting edge increases torsional stability. This results in favorable extrusion and wear behavior. The patented Merkel Guivex guide rings ensure an even distribution of transverse loads.
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Material selection is key

The stroke speeds for the forward and return strokes are highly variablein injection units, for example.This has an effect on the strength of the lubricating film and on recirculating capacity.

The stroke speeds for the forward and return strokes are highly variablein injection units, for example.This has an effect on the strength of the lubricating film and on recirculating capacity. To satisfy these particular demands, Freudenberg Seal Technologies employs the most appropriate sealing material. A pressure-relief Merkel Omegat main seal – a polyurethane version, for example – ensures the ideal balance of the tribological properties.
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Reliability

Extremely challenging operating parameters come together in clamping units: maximum operating pressure coinciding with a minimum stroke, high stroke speeds and pressureless operation over a comparatively long cylinder travel distance.

Extremely challenging operating parameters come together in clamping units: first of all, maximum operating pressure coinciding with a minimum stroke, and secondly high stroke speeds, and, accordingly, pressureless operation over a comparatively long cylinder travel distance. That is why the special PTFE glass MoS2 compound from Freudenberg Sealing Technologies is used as the sealing material, along with the pressure-relief version of the Merkel Omegat model line. They compensate for both poor lubrication and pressure build-ups in the sealing system. The result: high seal reliability and a long service life.
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