HYDRAULIC DIE CUSHION

Blank holder plates – highest surface pressure – economical tool change

THE RIGHT FORCE IN THE RIGHT PLACE

Sufficient blank holding force is of particular importance for sheet metal deep drawing operations. The hydraulic system is ideally suited for generating this holding force. The integration of one or more hydraulic functions in one tool, offers optimal solutions and high economic efficiency. Faster tool changes, the elimination of mechanical transmission elements and a much faster operational readiness, are just a few positive features. Hydraulic systems guarantee a high controllable blank holder force. This makes hydraulics in the tool extremely flexible and safe compared to other systems. Safe when holding the sheet to avoid wrinkles – safe in terms of economy.

ADVANTAGES

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Highest forces in the smallest space
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Constant characteristics
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direct power transmission without pressure plate (no influence of the drawing pins)
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optimal arrangement of the pressure points to the drawing edge
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immediate operational readiness, short set-up times
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reproducible settings, no rejects, immediately optimal parts production

Blank holder ring with one pressure zone, shape adapted to the tool

Die cushion integrated in a press table with pairs of pressure-programmable cylinders. Cut-outs for scrap in the trimming area.

Upper plate of a knuckle-joint press with integrated die cushion (manufacturing of heating radiators)
Hydraulic blank holder plate with clamping plate for variable blank holder and punch sizes
Blank holder block with hydraulic unit for edge retraction on a car body part
Blank holder block with hydraulic unit for edge retraction on a car body part
Hydraulic blank holder ring for the production of fan covers

HYDRAULICS DIE CUSHIONS – AS INDIVIDUAL AS THE APPLICATION

We do not offer off-the-shelf solutions. Every product has its own story. We only proceed consistently the same in a few points:
In a well-thought-out design, in manufacturing accuracy and in absolute accuracy of fit in the tools.

FORMING HAS A NEW CHARACTER

CHARACTERISTICS OF A SPRING

In single-acting presses, the blank holder force must be generated directly inside the tool. Conventional systems (e.g. gas springs, mechanical springs, air cushions) have narrow limits due to the relatively low blank holder force and unfavorable characteristics. The blank holder force achieved is relatively low, the increase in force, up to the end of the stroke, is extremely disadvantageous. The result: too little force for the formation, tears in the sheet, possibly damage to the press.

CHARACTERISTICS OF A HYDRAULIC BLANK HOLDER

Hydraulic blank holders offer a superior method. Very high force can be generated in the smallest space, enabling highest surface pressures until the sheet is held firmly. Advantage: Immediate force build-up, no material flow from the outside, no bracing of large parts, constant characteristics, progressive or degressive control options, pressure discharge in BDC of the press stroke, delayed return.

Selective - for maximum system rigidity

HYLATECHNIK hydraulic blank holders consist of individual pistons. Depending on the tool, pistons are installed directly in the base plate, in an intermediate table, or in a frame that is adapted to the die. These frames are individual in shape. The very high system rigidity is achieved by placing the pressure-generating pistons directly under the blank holder.

Regulation - through pressure zones

The cylinders installed in a plate are usually hydraulically connected to one another. However, if a differentiated blank holder force setting is required for difficult deepdrawing parts, different pressure zones are created. For this purpose, the individual cylinder chambers can be divided into several different pressure circuits with their own pressure adjustment valves.

Variable - thanks to single cylinders

The most universal form is represented by individual cylinders, which can be placed anywhere on the base plate. In existing tools, for example, gas springs can be replaced by these single cylinders, if higher sheet metal holder force and / or controllability is required.

Programmable – through proportional technology

By using proportional hydraulics, progressive or degressive force profiles can be programmed. Various program sequences are saved and called up as required. On request, you can receive the corresponding electrical control from our company.

WE LOOK FORWARD TO GET IN CONTACT WITH YOU

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