Metals are important in industry be

Metals are important in industry because they can be easily deformed into useful shapes. A lot of metalworking processes have been developed for certain applications. They can be divided into five broad groups:
1. rolling,
2. extrusion,
3. drawing,
4. forging,
5. sheet-metal forming.
During the first four processes metal is subjected to large amounts of strain (deformation). But if deformation goes at a high temperature, the metal will recrystallize — that is, new strain-free grains will grow instead of deformed grains. For this reason metals are usually rolled, extruded, drawn, or forged above their recrystallization temperature. This is called hot working. Under these conditions there is no limit to the compressive plastic strain to which the metal can be subjected.
Other processes are performed below the recrystallization temperature. These are called cold working. Cold working hardens metal and makes the part stronger. However, there is a limit to the strain before a cold part cracks.
Rolling
Rolling is the most common metalworking process. More than 90 percent of the aluminum, steel and copper produced is rolled at least once in the course of production. The most common rolled product is sheet. Rolling can be done either hot or cold. If the rolling is finished cold, the surface will be smoother and the product stronger.
Extrusion
Extrusion is pushing the billet to flow through the orifice of a die. Products may have either a simple or a complex cross section. Aluminium window frames are the examples of complex extrusions.
Tubes or other hollow parts can also be extruded. The initial piece is a thick-walled tube, and the extruded part is shaped between a die on the outside of the tube and a mandrel held on the inside.
In impact extrusion (also called back-extrusion) (штамповка выдавливанием), the workpiece is placed in the bottom of a hole and a loosely fitting ram is pushed against it. The ram forces the metal to flow back around it, with the gap between the-ram and the die determining the wall thickness. The example of this process is the manufacturing of aluminium beer cans

Результаты (английский) 1:

Metals are important in industry because they can be easily deformed into useful shapes. A lot of metalworking processes have been developed for certain applications. They can be divided into five broad groups:1. rolling,2. extrusion,3. drawing4. forging,5. sheet-metal forming.During the first four processes metal is subjected to large amounts of strain has been carried out (deformation). But if deformation goes at a high temperature, the metal will recrystallize — that is, the new strain has been carried out-free grains will grow instead of deformed grains. For this reason metals are usually rolled, extruded, drawn, forged or above their recrystallization temperature. This is the so-called hot working. Under these conditions there is no limit to the compressive plastic strain has been carried out to which the metal can be subjected.Other processes are performed below the recrystallization temperature. These are the so-called cold working. Cold working metal hardens and makes the part stronger. However, there is a limit to the strain has been carried out before a cold part cracks.RollingRolling is the most common metalworking process. More than 90 percent of the aluminum, steel and copper mass-produced is rolled at least once in the course of production. The most common product is rolled sheet. Rolling can be done either hot or cold. If the rolling is finished cold, the surface will be smoother and the product stronger.ExtrusionExtrusion is pushing the billet to flow through the orifice of a die. Products may have either a simple or a complex cross section. Aluminium window frames are the examples of complex extrusions.Tubes or other hollow parts can also be extruded. The initial piece is a thick-walled tube, and the extruded part is shaped between a die on the outside of the tube and a mandrel held on the inside.In impact extrusion (also called back-extrusion) (extrusions), the workpiece is placed in the bottom of a hole and a loosely fitting ram is pushed against it. The ram forces the metal to flow back around it, with the gap between the ram and the die determining the wall thickness. The example of this process is the manufacturing of aluminium beer cans

Результаты (английский) 2:

Metals are important in industry because they can be easily deformed into useful shapes. A lot of metalworking processes have been developed for certain applications. They can be divided into five broad groups :
1. rolling,
2. extrusion,
3. drawing,
4. forging,
5. metal-forming sheet.
During working the first a four Processes metal is subjected to large Amounts of strain (deformation). But if deformation goes at a high temperature , the metal will recrystallize - that is, new strain-free grains will grow instead of deformed grains. For this reason metals are usually rolled, extruded, drawn, or forged above their recrystallization temperature. This is called hot working. For These conditions there Under the no is the limit to the compressive plastic strain to the which the metal subjected the BE CAN.
Other Processes are Performed the below the recrystallization temperature. These are called cold working. Cold working hardens metal and makes the part stronger. HOWEVER, there is a the limit to the strain the before a cold part cracks.
The Rolling
the Rolling is the metalworking process are most common all. More than 90 percent of the aluminum, steel and copper produced is rolled at least once in the course of production. The most common rolled product is sheet. Rolling can be done either hot or cold . The rolling is the If the finished cold, the surface will of the BE smoother and stronger the product product.
Extrusion
Extrusion is pushing the billet to flow through the orifice of a die. Products may have either a simple or a complex cross section. The frames are window Aluminium the examples of the complex extrusions.
Tubes or hollow parts OTHER CAN Also the BE extruded. Of The initial piece is a the thick format-the walled tube, and the extruded part is shaped Between a die on the outside of the tube and a mandrel Held on the inside.
With In impact extrusion (Also Called back-extrusion) (extruding), the workpiece is placed in the bottom of a hole and a loosely fitting ram is pushed against it. The ram forces the metal to flow back around it, with the gap between the-ram and the die determining the wall thickness. The example of this process is the manufacturing of aluminium beer cans