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Screw extruder for continuous extrusion of materials with high viscosity

A screw extruder, high-viscosity technology, used in material forming presses, presses, manufacturing tools, etc., can solve problems such as impracticality and difficulty

Active Publication Date: 2009-10-07
NORSK HYDRO ASA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result of this characteristic, the screw extrusion of aluminum and other cohesive metals with high viscosity has been difficult and impractical due to the enormous force required to overcome the friction between, for example, aluminum and steel

Method used

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  • Screw extruder for continuous extrusion of materials with high viscosity
  • Screw extruder for continuous extrusion of materials with high viscosity
  • Screw extruder for continuous extrusion of materials with high viscosity

Examples

Experimental program
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Embodiment Construction

[0012] When extruding viscous and sticky materials such as metals in a continuous process with the aid of a screw extruder, the increased pressure due to the drag along the extruder of the material sticking to the liner and screw surfaces is achieved by forcing the material through the The pressure necessary for the mold at the end of the shell. Unlike typical screw extruders used in the polymer industry - where the viscosity of the polymer is much lower than that of the metal, the pressure area must be greatly reduced in order to avoid too high torque on the extruder. This object is achieved by combining a specially designed screw with extrusion chambers designed to restrict the rotational flow of metal. It is also necessary to control the temperature profile along the extruder. The overall length of the screw is thus also significantly shorter, which is typically 1.5-2.5 times the screw diameter.

[0013] The extruder is preferably fed granular metal at T < Ts, where Ts is...

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PUM

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Abstract

Screw extruder for the continuous extrusion of materials with high viscosity, in particular metals such as aluminium and its alloys. The extruder includes an Archimedes screw (1) rotationally provided within liner (2) of a screw housing (4) with an inlet (11) for the feeding of the material to be extruded, a compacting or extrusion chamber (5) and an extrusion die assembly with a die (6) which forms the shape of the desired extruded product (7). The design of the screw (1) and liner (2) is such that the required compaction takes place at the down-stream end of the screw towards the extrusion chamber (5) corresponding to up to 540 DEG of the rotation of the screw, or up to 1.5 turn of the screw flight length, and that the solid plug of metal thus formed at the end of the screw and extrusion chamber (5) is restricted from rigid rotation to obtain the required compaction and extrusion pressure.

Description

technical field [0001] The present invention relates to a screw extruder for continuously extruding materials with high viscosity, especially metals such as aluminum and its alloys, the extruder comprising: Archimedes screw , disposed in a screw housing having an inlet for feeding material to be extruded; a pressing or extrusion chamber; and an extrusion die assembly having a die forming the shape of the desired extruded product. Background technique [0002] Extrusion of materials with high viscosity, such as aluminum, requires relatively high pressures, typically 100 to 500 MPa, to force the aluminum through the die block and die. Regarding the state of the art in aluminum extrusion, ram extrusion dominates today and for the last 100 years. Punch extrusion is a batch process in which a billet is loaded into a container and forced (pressurized) through a die by means of a moving piston. A noteworthy method for continuous extrusion of aluminum is the so-called process, w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C23/21B30B11/24B29C48/395B29C48/53
CPCB29C47/385B29C47/6018B30B11/246B30B11/248B30B11/241B29C47/0803B21C23/005B29C48/53B29C48/397B29C48/2522B29C48/2556B21C23/212B21C23/01B21C23/21
Inventor J·C·韦伦肖尔L·奥朗H·J·罗文N·吕姆O·赖索
Owner NORSK HYDRO ASA
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