Extrusion Press Pressure Ring Convex Rear Base Design
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Solution Overview
Problem
In extrusion presses, deformation of the pressure ring leads to variations in die geometry and extruded profile geometry, particularly affecting thin profiles, resulting in non-uniform final product quality due to varying working forces throughout the extrusion cycle.
Innovation Solution
The assembly of a platen and pressure ring is designed with a convex rear base that redistributes deformation to the platen, maintaining a flat front base contact with the die pack by adjusting the geometry based on extrusion force and pressure distribution, using shapes like truncated cones or spheres to ensure planarity under maximum load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the thickness of the platen is increased to increase the total flexural rigidity of the system, then the deformation of the pressure ring is reduced, but the cost and weight of the platen increase significantly
Solution Approach 1:
The invention applies curvature to the rear base of the pressure ring by providing a convex shape (truncated cone or truncated sphere) instead of a flat surface. This curved geometry allows the pressure ring to deform in a controlled manner under varying extrusion forces, maintaining contact with the die pack and compensating for platen deflection without requiring excessive platen thickness.
Solution Approach 2:
The invention changes the geometric parameters of the pressure ring by introducing a convex rear base with specific curvature radius and angle parameters. This parameter modification enables the pressure ring to adapt its deformation characteristics to match the varying load conditions during extrusion, thereby maintaining dimensional stability of the extruded profile without increasing platen mass.
2Manufacturing precision
If the thickness of the platen is increased to increase the total flexural rigidity of the system, then the deformation of the pressure ring is reduced, but the manufacturing cost increases
Solution Approach 1:
The invention applies curvature to the rear base of the pressure ring by providing a convex shape (truncated cone or truncated sphere) instead of a flat surface. This curved geometry allows the pressure ring to deform in a controlled manner under varying extrusion forces, maintaining contact with the die pack and compensating for platen deflection without requiring excessive platen thickness.
Solution Approach 2:
The invention changes the geometric parameters of the pressure ring by introducing a convex rear base with specific curvature radius and angle parameters. This parameter modification enables the pressure ring to adapt its deformation characteristics to match the varying load conditions during extrusion, thereby maintaining dimensional stability of the extruded profile without increasing platen mass.
3Reliability
If a spherical coupling is used to adjust the orientation of the die pack, then the contact between pressure ring and die pack is improved, but the elastic deformations cannot be compensated under high loads
Solution Approach 1:
The invention applies curvature to the rear base of the pressure ring by providing a convex shape (truncated cone or truncated sphere) instead of a flat surface. This curved geometry allows the pressure ring to deform in a controlled manner under varying extrusion forces, maintaining contact with the die pack and compensating for platen deflection without requiring excessive platen thickness.
Solution Approach 2:
The invention makes the pressure ring's rear base geometry dynamic in its interaction with the platen seat. The convex shape allows the contact area and pressure distribution to change dynamically with varying extrusion loads, enabling the system to maintain optimal contact conditions across the entire loading range from low to maximum extrusion forces.
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 design significantly reduces front base deformation and geometric variations of the extruded profile, maintaining product quality while minimizing platen thickness and costs.
Implementation Method 1
The deformation of the system, and in particular of the contact surfaces between the pressure ring and the die pack, determines undesired variations of die geometry
Implementation Method 2
the elastic deformations of the structure when subjected to high loads cannot be compensated
Data Source
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AI summary
An extrusion press comprising a pressure ring (6) having a convex shape rear base (62) resting in a seat (71) of a platen (7). The convex shape is either spherical or truncated cone shaped so as to relieve onto the platen (7) the greatest amount of extrusion pressure exerted on the front face (61) of the pressure ring (6) of the die pack (3). This limits the deformation on the front base (61) and consequently the geometric variations of the extruded profile (5).