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Identify the Right Control System for You

Pressure Control Beckwood Press Custom Hydraulic PressesWhether your process is stamping sheet metal or forming composite components, choosing the right press return for your application is crucial.  Identifying the capability needs, up front, can eliminate additional costs and start up delays. 

Hydraulic presses offer the capability of configuring the press stroke to meet your die or application needs.   They also have the ability to adjust the overall travel of the ram and can be configured to return at a given position or a given force. This flexibility yields the greatest advantage for hydraulics for a wide variety of applications.

The most critical factor in selecting a hydraulic press, is to match the press capability to the needs of the application.  There are three primary press capabilities available (though all can be combined depending on the required performance of the application). 

Return on Pressure

The most common and economical performance capability for a hydraulic press is the ability to Return on Pressure. Because a hydraulic press can develop full tonnage anywhere in the stroke, this lends a great deal of inherent flexibility. Dies with integral stop blocks but multiple shut heights can be easily run on the same press with minimal set up. 

In addition to flexibility and reduced set up time, dies and applications that are designed for this mode of operation gain absolute repeatability at very little cost.  Even traditional punch tooling can be run under return on pressure mode by incorporating fixed stops into the tooling or press system. In this mode, the ram will lower and extend to a preset target force and then return to the up limit position.

Today, most dies are being designed with stop blocks either built into them or designed so that the die itself can be closed to "bottom out" and support the force of the ram. In this case, operators can set the target return force set point slightly above the necessary force

Return on Position

Return on Position is another commonly requested performance capability, but is also the most routinely misunderstood. Unlike a mechanical press, in Return on Position Beckwood Custom Hydraulic Presswhich the ram always strokes to the same bottom position every cycle, a hydraulic press can be controlled to stop and return at any point in the stroke.

The repeatability and accuracy of this type of control varies widely and is dependent upon many variables such as; speed of the ram, the type of valving used, the type of work being performed, etc... The level of performance has an impact on the cost of the hydraulic and control systems.

Basic and simple systems yield somewhat loose performance capabilities due to the reliance on hard shift valves to control the direction of the ram.  These systems achieve repeatability of perhaps ±0.020" - ±0.025".  More sophisticated systems integrate open or closed loop control to significantly improve and tighten the level of performance for repeatability of ±0.001".

Return on Pressure with Dwell

Return on Pressure with Dwell Beckwood Custom Hydraulic PressReturn on Position is another commonly requested performance capability, but is also the most routinely misunderstood. Unlike a mechanical press, in which the ram always strokes to the same bottom position every cycle, a hydraulic press can be controlled to stop and return at any point in the stroke.

The repeatability and accuracy of this type of control varies widely and is dependent upon many variables such as; speed of the ram, the type of valving used, the type of work being performed, etc... The level of performance has an impact on the cost of the hydraulic and control systems.

Basic and simple systems yield somewhat loose performance capabilities due to the reliance on hard shift valves to control the direction of the ram.  These systems achieve repeatability of perhaps ±0.020" - ±0.025".  More sophisticated systems integrate open or closed loop control to significantly improve and tighten the level of performance for repeatability of ±0.001".