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Glossary

A

Absolute Pressure - A pressure scale with the zero point at a perfect vacuum. The sum of atmospheric and gauge pressure.

Absorbent Filters - A filter medium that entraps contaminants and holds it by mechanical means.

Accumulator - A container in which fluid is stored under pressure and includes some type of limit in loading mechanism for maintaining pressure.

Acid Number - The quantity of base, expressed in milligrams of potassium hydroxide, that is required to neutralize the acidic constituents in one gram of sample. See neutralization number.

Adaptive Control System - A system that modifies its control algorithm as the system’s operating conditions change so that optimal performance can be achieved.

Adhesive Lock - The adherence of surfaces due to weldment/fusion of asperity contact points/ junctions or by increased surface contact area due to polishing.

Air Cleaner Fine Test Dust (ACFTD) - A naturally occurring material representative of contaminant associated with ingression-type systems. It is produced from natural Arizona road dust and it is processed, packaged, and distributed worldwide. Used for particle counter calibration, filter tests, and component contaminant sensitivity testing.

Air Release Valve - A check type valve having a movable closing element (e.g., a ball) with a density less than the host liquid. When the closure element is surrounded by air, the valve automatically opens and will close when it is surrounded by liquid.

Airdraulic - A component combining both an air and oil system; e.g., an intensifier using air as the driving medium and oil as the amplified pressure medium.

B

Bed - Flat, stationary machined surface that supports the bolster or dies.

Bolster - The removable plate that serves as the working surface for the bed and ram. The plate is typically bolted to the bed and ram substructures. The bolsters can be machined with a variety of work holding features such as; T-Slots, Drilled and Tapped Holes, Lift Rails for Quick Die Change, etc...

Bed Cushion - A bed cushion is a commonly required for draw tooling & is a system that applies resistance when pushed upon. This resistance can be dynamic or statically controlled throughout that stroke. Bed cushion have a pusher pin plate that is located just beneath the bed bolster. The bed bolster is provided with multiple through holes usher “ “pusher pins” are inserted. These pins are used by the tooling to generate resistive force as the hydraulic press raw pushes down.

Blankholder - A control controlled force to hold the edges of the blank in deep drawing operations. Similar to a die cushion.

Bottom Stop -
  • By Pressure: The press may be designed to 'return on pressure'. This method utilizes a pressure sensing device which is adjustable and is set to determine the desired maximum pressure to be achieved by the ram. Once this pressure is achieved, the ram typically completes the cycle by returning to the home position or Up Limit position.

  • By Position: The press may be designed to 'return on position'. This method utilizes either a position sensing device or a limit or proximity switch that can be set to signal that the desired ram extension has been achieved.

Bed Height - Bed Height is the distance from the bottom of the hydraulic press structure to the working height or top of the bed bolster.

Bed Cushion - A bed cushion is a commonly required for draw tooling and is a system that applies resistance when pushed upon. This resistance can be dynamic or statically controlled throughout the stroke. Bed cushions have a "pusher pin plate" that is located just beneath the bed bolster. The bed bolster is provided with multiple through holes where "pusher pins" are inserted. These pins are used by the tooling to generate resistive force as the hydraulic press ram pushes down. The cushion can also be configured for multiple control zones for on-the-fly dynamic control.

Bench or Laboratory Hydraulic Press - A smaller sized hydraulic press suitable for research and development, prototyping, or laboratory use.

Basic Fluid Power Research Program BFPR - A research program administered by the Fluid Power Research Center at OSU for a consortium of companies worldwide to economically discover, develop, verify, and present design and other technical information to serve the needs of practicing engineers in the fluid power industry.

Bernoulli’s Law - States that if no work is done on or by a flowing frictionless fluid, its energy due to pressure and velocity remains constant at all points along the streamline. That is, an increase of velocity is always accompanied by a decrease in pressure.

Beta Ratio - An international standard method of expressing the filtration ratio or particle capture characteristics of a hydraulic filter. It is the ratio of the number of particles greater than a given size in the influent fluid to the number of particles greater than the same size in the effluent fluid.


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