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Luftboden

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08:54 Feb 14, 2008
This question was closed without grading. Reason: Answer found elsewhere

German to English translations [PRO]
Tech/Engineering - Mechanics / Mech Engineering
German term or phrase: Luftboden
From a checklist for a press line for automotive parts (dies, etc.). Is "Luftboden"= "air cushion"?

"Sind die Unterluft-Zwischenbolzen gleichmäßig am **Luftboden** verteilt?" [Client's terminology: Unterluft-Zwischenbolzen = Lower air cushion intermediate pins]

"Wird Niederhalter bzw. **Luftboden** auf Enddruck gefahren? (bei Form-Werkzeug) [Client's terminology: Niederhalter = Pressure pad]
William Swanson
Germany
Local time: 02:36
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Summary of answers provided
3lower die set
Ruth Wiedekind


Discussion entries: 1





  

Answers


3 hrs   confidence: Answerer confidence 3/5Answerer confidence 3/5
lower die set


Explanation:
Den Begriff "Unterluft" kenne ich nicht.
Es wird aber um die Bolzen gehen, die in den die Gasdruckfedern enthaltenden Tankplatten angebracht sind. Dein Kunde spricht von "air cushion"; ich kenne dafür "manifolds".

Dass ein "Luftboden" auf Enddruck gefahren werden soll... Ich tippe daher auf "lower die set".

Hier Information:

Gas and Nitrogen Manifolds
Manifolds are perhaps one of the most popular types of pressure systems used in deep drawing. They essentially are large blocks of steel or aluminum checked for porosity and inserted with a series of individual gas springs. A series of large ports and gas channels are gun-drilled into the manifold. These gas channels connect each of the cylinders and unify the force exerted by each cylinder.

In addition, each cylinder can operate independently. Independent suspension is important to reduce binder deflection and accurately control metal flow. Uniform pressure and distribution characteristics can be achieved with a nitrogen manifold. Figure 1 shows a typical nitrogen manifold. (Image courtesy of Forward Systems)

Advantages
Gas manifolds are easy to install. They are a self-contained single block that can be designed quickly and mounted in a die set or cast foundation.
They require little maintenance. Unlike plumbed gas systems, there are no hoses to deal with. Because there are no hoses, leaks are less likely to occur.
A manifold can serve as the lower die set, reducing tooling cost. With a little preplanning, guide pins can be installed in the manifold.
Manifolds have a low-pressure rise. Because of the large volume of nitrogen held in the manifold, the force or pressure rise is limited to about 15 percent when the cylinders are fully compressed, eliminating the need for a surge tank.
The force is fully adjustable. Adding or removing nitrogen gas easily adjusts pressures.
Cylinder heights can be staggered to reduce blank holder surface shock loading.
Cylinders can be replaced easily with quick-connect devices.
When the manifold is part of the die, die change time is reduced.
Disadvantages

Gas manifolds typically cost more than a plumbed system.
Manifolds usually have to be custom-made for each application.
The force exerted by the manifold must be included in press bolster deflection calculations.
No method of preacceleration is available to reduce blank holder shocking.

http://www.thefabricator.com/ToolandDie/ToolandDie_Article.c...
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Niederhalter = blank holder
The part of a draw die which holds the work piece against the draw ring to control metal flow. A blank holder is also called binder, binder ring, or ring. That part of a forming die which holds the blank by pressure against a mating surface of the die to control metal flow and prevent wrinkling. The blank holder is sometimes referred to as “hold down” or binder area. Pressure applied by mechanical means, springs, air, or fluid cushions (Automotive Steel Partnership, 1991, p.2).
(http://nsmwww.eng.ohio-state.edu/Stamping_Glossary/html/b.ht...
-> auch "draw ring"

Da "Ernst 2004 D-E: Blechhalter m, Niederhalter m (beim Zugdruckumformen) (Fert) / blank holder, pressure ring" kannst Du evtl. auch "pressure pad" nehmen. Ich wäre aber vorsichtig damit, da es auch im Dt. "Druckplatten" gibt. (Ernst 2004 E-D: pressure pad = Gegenhalter)

Noch mehr Info:

Pressure Pads/ Plates. During the wipe bending process, the metal must be held down tightly to the lower die section before the forming punch contacts the metal. Pressure pads must apply a force that is at least equivalent to the bending force. Most pressure pads use high-pressure coil or gas springs (Figure 1). When loaded with very high-pressure springs, contoured or flat pads also can form sheet metal. These pad types often are referred to as power punches.

(thefabricator.com - Die Basics 101 Part V.htm)

Noch viel Spaß. Ich liebe Presswerkzeuge!

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Note added at 3 hrs (2008-02-14 12:13:47 GMT)
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Besonders wichtig war für mich der Satz "A manifold can serve as the lower die set, reducing tooling cost. With a little preplanning, guide pins can be installed in the manifold. " (siehe unter "Advantages" oben.)

Ruth Wiedekind
Germany
Local time: 02:36
Specializes in field
Native speaker of: Native in GermanGerman
PRO pts in category: 44
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