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A machine used to bend sheet metal into different forms.

Related Terms

CORROSION INHIBITOR

Additive for protecting lubricated metal surfaces against chemical attack by water or other contaminants. There are several types of corrosion inhibitors. Polar compounds wet the metal surface preferentially, protecting it with a film of oil. Other compounds may absorb water by incorporating it in a water-in-oil emulsion so that only the oil touches the metal surface. Another type of corrosion inhibitor combines chemically with the metal to present a non- reactive surface.

DEPOSITS

Oil-insoluble materials that result from oxidation and decomposition of lube oil and contamination from external sources and engine blow-by. These can settle out on machine or engine parts. Examples are sludge, varnish, lacquer and carbon.

ADSORPTION

Adhesion of the molecules of gases, liquids, or dissolved substances to a solid surface, resulting in relatively high concentration of the molecules at the place of contact; e.g. the plating out of an anti-wear additive on metal surfaces.

BASE

A material which neutralizes acids. An oil additive containing colloidally dispersed metal carbonate, used to reduce corrosive wear.

ADSORPTION INHIBITOR

They are materials which caused them to be adsorbed on to the metal surface due to their polar properties.

ASPERITIES

microscopic projections on metal surfaces resulting from normal surface-finishing processes. Interference between opposing asperities in sliding or rolling applications is a source of friction, and can lead to metal welding and scoring. Ideally, the lubricating film between two moving surfaces should be thicker than the combined height of the opposing asperities.

EROSION

The progressive removal of a machine surface by cavitation or by particle impingement at high velocities.

CATASTROPHIC FAILURE

Sudden, unexpected failure of a machine resulting in considerable cost and downtime.

FILM STRENGTH

Property of a lubricant that acts to prevent scuffing or scoring of metal parts.

BREAKDOWN MAINTENANCE

Maintenance performed after a machine has failed to return it to an operating state.
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