Internal Mandrel Cooling for Uniform Extrusion Profile Quenching
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Solution Overview
Problem
Conventional cooling methods for extruded metal profiles often result in differential cooling, leading to geometric distortion and residual stresses, especially in complex profiles with multiple internal voids.
Innovation Solution
A die assembly with an internal mandrel and cooling channel that disperses a cooling fluid into the interior hollow section of the extruded profile, allowing for direct and uniform cooling of both the interior and exterior surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional cooling methods are used for extruded metal profiles, then the cooling process is simple, but differential cooling occurs leading to geometric distortion and residual stresses
Solution Approach 1:
The cooling system is segmented into multiple independent cooling channels distributed throughout the die assembly, allowing different regions to be cooled independently. This enables uniform cooling across complex profiles with multiple internal voids, preventing differential cooling and associated distortion while maintaining manageable system complexity through modular channel design
Solution Approach 2:
The cooling channels are strategically positioned to provide localized cooling where needed most, with channels extending into internal cavities and along critical profile sections. This allows tailored cooling rates for different regions of the extruded profile, ensuring uniform overall cooling while accommodating the complex geometry without requiring an overly complicated global cooling system
2Force
If the billet is extruded at elevated temperature to reduce yield strength, then the force required for extrusion is reduced, but the temperature increase during extrusion must be controlled for heat treatable alloys
Solution Approach 1:
The billet is preheated to elevated temperature before extrusion to reduce its yield strength and minimize the force required for deformation. The cooling channels are pre-positioned in the die assembly to immediately begin cooling the extruded profile as it forms, allowing the extrusion process to proceed at lower forces while subsequent rapid cooling controls the final temperature for heat treatable alloys
Solution Approach 2:
The cooling channels are integrated directly into the die assembly, enabling continuous cooling of the extruded profile from the moment it leaves the die cavity. This continuous cooling action maintains control over the temperature profile throughout the extrusion process, allowing elevated temperature extrusion for force reduction while ensuring the final product achieves the required temperature characteristics
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
This approach ensures more uniform cooling of extruded profiles, reducing distortion and residual stresses, and improving material strength, thereby minimizing rejection rates and enhancing the efficiency of the extrusion process.
Implementation Method 1
supplying a fluid to the internal cooling channel. The internal cooling channel is configured to convey the fluid from the inlet to the outlet of the internal cooling channel, such that the fluid is dispersed at the outlet of the internal cooling channel within the internal mandrel into the interior hollow section of the extruded profile to cool the extruded profile
Implementation Method 2
the fluid is dispersed at the outlet of the internal cooling channel within the internal mandrel into the interior hollow section of the extruded profile to cool the extruded profile
Data Source
AI summary
A die assembly includes an inflow end, an outflow end opposite the inflow end, and an internal cavity extending from the inflow end to the outflow end. The die assembly also includes an internal mandrel disposed within the internal cavity. The internal mandrel has an end proximate to the outflow end of the die assembly. The die assembly also includes an internal cooling channel within the internal mandrel. The internal cooling channel has an outlet at or near the end of the internal mandrel.