Extrusion History

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 Process in which a metal bar under pressure from the mold with the specific form of data transmission and reduce the cross-sectional area, extrusion, extrusion Namnd.fraynd compared with other methods of shaping method is relatively new. Extrusion was first introduced in the early nineteenth century and the first lead pipes were produced in this way. […]

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Extrusion equipment

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There are many different variations of extrusion equipment. They vary by four major characteristics:[1] Movement of the extrusion with relation to the ram. If the die is held stationary and the ram moves towards it then its called “direct extrusion”. If the ram is held stationary and the die moves towards the ram its called […]

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Process

The process begins by heating the stock material (for hot or warm extrusion). It is then loaded into the container in the press. A dummy block is placed behind it where the ram then presses on the material to push it out of the die. Afterward the extrusion is stretched in order to straighten it. […]

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Hot extrusion

Hot extrusion is a hot working process, which means it is done above the material’s recrystallization temperature to keep the material from work hardening and to make it easier to push the material through the die. Most hot extrusions are done on horizontal hydraulic presses that range from 230 to 11,000 metric tons (250 to […]

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Extrusion defects

Surface cracking – When the surface of an extrusion splits. This is often caused by the extrusion temperature, friction, or speed being too high. It can also happen at lower temperatures if the extruded product temporarily sticks to the die. Pipe – A flow pattern that draws the surface oxides and impurities to the center […]

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Cold extrusion

Cold extrusion is done at room temperature or near room temperature. The advantages of this over hot extrusion are the lack of oxidation, higher strength due to cold working, closer tolerances, good surface finish, and fast extrusion speeds if the material is subject to hot shortness. Materials that are commonly cold extruded include: lead, tin, […]

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