Speed Control gas springs have been designed to reduce or eliminate blank holder bounce and is a part of the problem-solving KALLER products.
Speed Control gas springs work by slowing down the speed at which the blank holder travels just before it reaches its start position. This is achieved by damping the Speed Control’s piston rod return speed to 0.4 m/s during the last 30 mm of piston rod travel.
Blank holder bounce often occurs as a result of an excessive press stroke return speed, commonly associated with new generation of presses.
The height of the blank holder lift depends on the speed that the blank holder is traveling at when its supporting gas springs reach their fully extended positions. At this point, the inertia of the blank holder causes it to lift up from its supporting gas springs.
If we assume that at this separation point the only force acting on the blank holder is gravity, then we can calculate the theoretical height the blank holder will lift, at various separation speeds.
In reality, however, there are other factors that affect the blank holder causing these theoretical lift heights to either increase or decrease.
|Separation speed [m/s]||Theoretical lift [mm]|
|Min. operating temperature (°C)||0|
|Max. operating temperature (°C)||80|
|Force increase by temperature (%/ °C)||0.3|
|Max. charging pressure (bar at 20°C)||150|
|Max. piston rod velocity (m/s)||1.6|
Initial Force (N)
Cylinder Diameter (mm)
Stroke Length (mm)
Total Length (mm)
Available stroke lengths
Initial force at max. pressure
|Gas link system||Length equation||
|Min. charging pressure
(bar at 20°C)
|Recommended max. strokes/min.
|SPC 750||80 - 300||7400||No||110 + (2 x Stroke)||75||25||See download tab*|
|SPC 1500||125 - 300||15000||No||120 + (2 x Stroke)||95||25||See download tab*|
|SPC 3000||125 - 300||30000||No||140 + (2 x Stroke)||120||25||See download tab*|
|SPC 5000||125 - 300||50000||No||155 + (2 x Stroke)||150||25||See download tab*|