Segmented Extrusion Liner with Curved Corners
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Solution Overview
Problem
Metal extrusion presses face challenges in achieving thermal alignment due to temperature variations within the container, leading to non-uniform extrudate flow and increased scrap rates, particularly with single-piece rectangular liners prone to cracking and dead metal zones.
Innovation Solution
A liner with longitudinally extending heating elements and temperature sensors on both sides of a rectangular passage, allowing for individual control of thermal profiles and reduced stress concentrations through flared ends and rounded corners, enhancing temperature uniformity and reducing stress-related failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-piece rectangular liner is used, then manufacturing simplicity is improved, but stress concentrations and cracking occur at corners
Solution Approach 1:
The liner is divided into multiple segments (first liner segment, second liner segment, third liner segment, fourth liner segment) arranged around the passage. This segmentation eliminates stress concentrations at corners while maintaining manufacturing feasibility, as each segment can be formed without sharp corner stress points.
Solution Approach 2:
The liner segments are designed with curved outer surfaces that are complementary to the inner surface of the container, replacing sharp rectangular corners with curved transitions. This curvature eliminates stress concentration points while maintaining the rectangular passage profile through the arrangement of curved segments.
2Device complexity
If conventional heating methods are used, then energy input is simplified, but temperature uniformity across the passage is poor
Solution Approach 1:
Different heating zones are created along the liner with varying heating capabilities. The first and second heating zones are positioned adjacent to opposite sides of the passage, allowing independent temperature control in different regions to achieve uniform temperature distribution across the rectangular passage.
Solution Approach 2:
Heating elements are positioned in multiple dimensions around the passage (adjacent to opposite sides), transitioning from single-point or single-line heating to distributed multi-dimensional heating. This spatial arrangement ensures uniform heat distribution across the entire cross-section of the rectangular passage.
3Temperature
If heating elements are added to achieve thermal alignment, then temperature control is improved, but device complexity increases
Solution Approach 1:
The liner segments serve multiple functions: they define the rectangular passage geometry, provide heating surfaces through integrated heating zones, and distribute thermal energy uniformly. This multi-functionality reduces overall system complexity by combining structural and thermal control functions in a single component.
Solution Approach 2:
The heating zones are integrated directly into the liner structure, merging the heating function with the structural liner function. This integration eliminates separate heating apparatus and reduces system complexity while achieving precise thermal alignment control.
4Shape
If rectangular passage liner is used, then extrusion of flat profiles is improved, but dead metal zones form at corners
Solution Approach 1:
The curved outer surfaces of the liner segments eliminate sharp corners in the passage, preventing dead metal zone formation. The curved geometry maintains material flow while still enabling extrusion of flat-profiled products through the rectangular passage configuration.
Solution Approach 2:
The rectangular passage is formed by arranging multiple curved segments, which eliminates corner stress concentrations and dead metal zones while maintaining the overall rectangular profile necessary for flat extrudate shapes.
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 precise control of thermal profiles within the extrusion press, reducing temperature variations and stress concentrations, resulting in improved productivity, reduced scrap rates, and extended liner and mantle lifespan by maintaining optimal billet temperature and uniform extrudate flow.
Implementation Method 1
conduction is the principal method of heat transfer within the container
Implementation Method 2
radiant heat lost from the bottom surface of the container rises inside the container housing, leading to an increase in temperature at the top
Data Source
AI summary
A liner for an extrusion press container that includes an elongate body having a longitudinally extending passage therein through which a billet is advanced, the passage having a generally rectangular cross-sectional profile. The liner further comprises at least one first longitudinally extending heating element accommodated by the body adjacent a first side of the passage, and at least one second longitudinally extending heating element accommodated by the body adjacent a second side of the passage. The first and second heating elements are individually controllable for controlling a thermal profile within the liner.