First-Hand News?

Obtain news and background information about sealing technology, get in touch with innovative products – subscribe to the free e-mail newsletter.

140 Beats per Second

Weinheim (Germany), December 13, 2017. Freudenberg Sealing Technologies has developed a new sealing system for Atlas Copco, the leading global producer of rock drills. The system has made it possible to double the maintenance intervals for a new generation of machines used in harsh underground conditions. Serial production of the COP MD20 has been launched recently in Örebro (Sweden).

The drill bit strikes the surface of the stone with a force of 25 tons up to 140 times per second. Its task: to drill 80 holes where explosive charges are inserted. They blast away rock for supply tunnels for underground mining or for road construction. The drill bits are driven by rock drills. Two factors are decisive in keeping operating costs low: On one hand, the holes must be drilled very quickly, even in hard stone such as granite, which requires very powerful forces. On the other hand, despite the strong forces, maintenance intervals are supposed to increase. With the development of its new machine, the COP MD20, Atlas Copco has resolved its conflicting objectives: Without a reduction in the machinery’s rate of advance, the company was able to double its maintenance intervals.

A new sealing system from Freudenberg Sealing Technologies was the key component in accomplishing this, as the metallic components, especially the piston that drives the drill bit, had been previously optimized by using special high-strength alloys. But the forces that are produced, especially during the bit’s recoil, are so high that they severely stress the seals in this high-pressure hydraulic system. If the seals develop wear, the result can be leakage, which has a highly negative effect on the relationship between the applied energy and the boring power – in other words, the system efficiency declines.

Atlas Copco Cop MD 20
© Atlas Copco Rock Drills AB

In a workshop initiated by Freudenberg Sealing Technologies, the developers found the precise cause of the wear: The seals were not just stressed by the piston’s longitudinal movement – the piston was simultaneously setting the seals into a rotational motion as well. This analysis showed that one of the radial shaft seal rings moves relatively constantly at 300 to 400 revolutions per minute, for which it was not designed. Therefore, Freudenberg engineers developed a special solution for the COP MD20, incorporating a changed design and a new mix of materials. Subsequently, trials on the test stand and with six test vehicles – which had to prove themselves underground in Australia, Sweden, Spain and Portugal – provided the evidence: The lifespan of the crucial seal could be extended significantly.

Since early 2017, Atlas Copco has been producing the new rock drill COP MD20 from in Örebro (Sweden). Freudenberg Sealing Technologies is the sole supplier of all 30 seals used in the new machine generation. Besides numerous components in the hydraulic system, the equipment also incorporates housing seals, which ensure that neither drilling dust nor moisture can penetrate the equipment.

Freudenberg experts from Hamburg, Schwalmstadt and Weinheim (all Germany), as well as Sweden, were involved in the development of the COP MD20 sealing system. The whole project followed the innovation management process of Freudenberg Sealing Technologies. It began with a joint customer–supplier workshop and walked through a five step process starting in R&D and ending up with the production of a break through innovation.

Ulrike Reich

Ulrike Reich

Head of Media Relations & Internal Communications

Telephone: + 49 (0) 6201 80 5713

ulrike.reich@fst.com
Subscription service

Press Release Subscription Service

You can subscribe to the Freudenberg Sealing Technologies news alert service, bringing you the news as soon as they are published. You can always unsubscribe from this service.

Subscribe now!

Further articles with these taggings

Supplier Excellence Award from Panasonic

03.05.2099

NOK-Freudenberg China honored as “outstanding supplier” for the second time.

Read more

Static Seals

Freudenberg Expands Engineering Services

07.07.2020

Increased customer demand for testing assistance prompts company to open second validation center

Read more

Dynamic Seals Material Expertise

High Pressures? No Problem!

09.06.2020

Freudenberg Sealing Technologies worked with valve manufacturer Bardiani Valvole to engineer a seal that supports its new high-pressure valve certified according to global 3-A® Sanitary Standards.

Read more

Dynamic Seals Material Expertise Special Seals

Clever Combination

02.06.2020

Freudenberg Sealing Technologies has launched series production of a modular sealing unit that combines a classic radial shaft seal with a plastic outer case. The design promotes better long-term seal performance and longevity, is easier to assemble and significantly lowers manufacturing costs in comparison with traditional metal-encased radial shaft seal units.

Read more

Dynamic Seals Material Expertise

Steering Made Easy

04.02.2020

Freudenberg Sealing Technologies introduces a seal that comes with an integrated bearing.

Read more

Dynamic Seals

Accurate Long-Term Predictions

21.01.2020

Freudenberg Sealing Technologies’ new method shows how static seals actually age.

Read more

Static Seals

Freudenberg Develops Next-Generation Low Friction Bearing for Improved Lubrication

03.12.2019

New “scoop” feature enables applications reliant on splash lubrication to run at higher critical speeds.

Read more

Automotive Dynamic Seals

Friction Reduction in the Seal

19.11.2019

The engineers at Freudenberg Sealing Technologies (FST) and Freudenberg Technology Innovation (FTI) have developed a new coating that forms a flexible bond with the elastomer of the seal and significantly improves wetting with synthetic lubricants.

Read more

Material Expertise Dynamic Seals

The Wedge Makes It Possible

29.10.2019

A new design concept from Freudenberg Sealing Technologies simplifies the installation of the seal between the housing and the piston rod inside a absorber.

Read more

Automotive Dynamic Seals
Newsletter

First Hand News

Best of all, keep up with the latest developments
with the Freudenberg Sealing Technologies newsletter.

Subscribe now!