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ค้นเจอ 477 รายการ

Boring Tool

(english) A cutting tool in which the tool bit,the boring bar and in some cases the tool holder are incorporated.

Blast Furnace

(english) 1) A furnace in which solid fuel (limestone, coke, iron ore) is combined with high-pressure, hot air blast (120,000 psi) to smelt ore in a continuous process (They are never stopped. They can be slowed down or idled). A Blast Furnace in the iron and steel industry is used to produce liquid iron.

Boron Steels

(english) The addition of boron in the range 0.0005-0.005% to certain steels increases the hardenability. A range of boron steels is now listed in the current BS 970 and are widely used for the production of cold headed fastenings.

Chlorofluorocarbons

(Environmental Engineering) Synthetic organic compounds used for refrigerants, aerosol propellants (prohibited in the U.S.), and blowing agents in plastic foams. CFCs migrate to the upper atmosphere destroying ozone and increasing global warming. Typical atmospheric residence times are 50 to 200 years.

Dissolved oxygen (DO)

(Environmental Engineering) The amount of molecular oxygen dissolved in water.

Bend Test

(english) Various tests which is used to ascertain the toughness and ductility of a metal product, in which the material is bent around its axis and/ or around an outside radius. A complete test might specify such a bend to be both with and against the direction of grain. For testing, samples should be edge filed to remove burrs and any edgewise cracks resulting from slitting or shearing. If a vice is to be employed, then you must line the jaws with some soft metal, to permit a flow of the metal in the piece being tested.

Strength:

(english) A very general term that may be applied to a material or a structure. In a material, strength refers to a level of stress at which there is a significant change in the state of the material, e.g., yielding or rupture. In a structure, strength refers to a level of level of loading which produces a significant change in the state of the structure, e.g., inelastic deformations, buckling, or collapse.

Bloomery

(english) A primitive furnace used for direct reduction of ore to iron.

Brine

(english) A saltwater solution for quenching or cooling when heat treating steel.

Abrasive Wheels

(english) Wheels of a hard abrasive, such as Carborundum used for grinding.

Bessemer Process

(english) A process for making steel by blowing air through molten pig iron contained in a refractory lined vessel so that the impurities are thus removed by oxidation.

Inertia:

(english) The tendency of an object at rest to remain at rest, and of an object in motion to remain in motion.

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