Extrusion Press Liner Venting for Continuous Gas Removal
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Solution Overview
Problem
Existing metal extrusion processes face challenges in effectively removing gases trapped between the billet and the container wall, leading to blistering in extruded products, as conventional venting methods require pressure seals and can disrupt the extrusion process.
Innovation Solution
A container design with a longitudinally extending passage and an elongate slot in the liner, combined with a vacuum conduit for continuous suction, allows for gas removal without forming a pressure seal, ensuring uninterrupted extrusion and improved product quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If conventional venting methods are used to remove gases, then gas removal is achieved, but pressure seals are required and the extrusion process is disrupted
Solution Approach 1:
The patent extracts the gas removal function from the conventional pressure-seal venting system by introducing a vacuum conduit that connects to the exterior of the container through the liner wall. This allows gases to be removed through a separate vacuum pathway without requiring pressure seals in the venting mechanism itself, thereby simplifying the venting system while maintaining effective gas removal.
Solution Approach 2:
The vacuum conduit acts as an intermediary element that provides a dedicated gas removal pathway independent of the pressure seal system. By introducing this intermediate component, the patent enables gas removal without the need for complex pressure sealing mechanisms, resolving the contradiction between effective venting and device simplicity.
2Object-generated harmful factors
If conventional venting methods are used to remove gases, then gas removal is achieved, but the extrusion process is interrupted
Solution Approach 1:
The vacuum conduit enables continuous gas removal throughout the extrusion process without interrupting the flow of the extruded material. The vacuum system operates continuously or intermittently to remove gases as they are generated, maintaining uninterrupted extrusion and improving productivity while effectively preventing gas entrapment.
Solution Approach 2:
The vacuum conduit is pre-installed and positioned within the container before extrusion begins. This preliminary arrangement ensures that gas removal capability is already in place and can immediately begin removing gases as they are generated during extrusion, preventing interruptions to the process.
3Device complexity
If gases are not removed during extrusion, then the process is simple, but gases become trapped and form voids in the extruded product
Solution Approach 1:
The patent employs pneumatic principles by using a vacuum conduit to create negative pressure for gas removal. This pneumatic approach provides an effective yet relatively simple mechanism for gas removal that maintains product quality without requiring complex mechanical venting systems, resolving the contradiction between device simplicity and manufacturing precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables continuous operation with higher throughput and reduced blistering by effectively removing gases during the extrusion process, enhancing the strength of the extrusion container and maintaining optimal thermal profiles.
Implementation Method 1
a vacuum conduit in fluid communication with the passage for removal of gases from the passage during extrusion
Data Source
AI summary
A container for use in a metal extrusion press comprises: a mantle having an elongate body comprising an axial bore; an elongate liner accommodated within the axial bore. The liner comprises a longitudinally extending passage through which a billet is advanced, and an elongate slot adjoining the passage. The container also comprises a vacuum conduit in fluid communication with the passage for removal of gases from the passage during extrusion.