Adjustable Die Retaining Assembly for Extrusion Alignment
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Solution Overview
Problem
Existing extrusion equipment faces challenges in adjusting the alignment of the extrusion die while maintaining even pressure, leading to potential shutdowns and safety hazards due to differential pressures causing the die to move out of alignment during operation.
Innovation Solution
An adjustable die retaining assembly that evenly and variably presses the die with controllable pressure, allowing for precise adjustment of the die's position using movable elements, minimizing the risk of pressure loss and die misalignment, and incorporating a pressure applicator and axial adjuster to reduce the force required for position changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the die is securely held in place by bolts to withstand extrusion pressure, then the die remains stable and prevents extrudate escape, but the die cannot be adjusted for alignment without releasing pressure and shutting down the extruder
Solution Approach 1:
The die retaining assembly transitions from a static fixed state to a dynamic adjustable state through the actuator mechanism. The actuator allows the retaining structure to be temporarily relaxed for die adjustment and then restored to its securing function, enabling the system to adapt between stability and adjustability requirements during different operational phases.
Solution Approach 2:
The system allows die adjustment to be performed during normal extrusion operation without requiring shutdown or release of extrusion pressure. The actuator mechanism enables operators to adjust die alignment while the extruder continues running, making the adjustment process self-contained and not requiring external intervention that would interrupt production.
2Ease of operation
If multiple bolts are loosened sequentially to adjust die position, then the die can be moved, but uneven pressure is applied to the die and extrusion quality deteriorates
Solution Approach 1:
The invention extracts the pressure control function from the traditional bolt loosening process. Instead of relying on manual sequential bolt loosening which creates uneven pressure, the actuator mechanism centrally controls and uniformly distributes the pressure reduction across all retaining points, ensuring even pressure application during die adjustment.
Solution Approach 2:
The system provides visual feedback through alignment indicators that show when the die is properly aligned. This feedback mechanism guides the adjustment process, allowing operators to make precise adjustments while maintaining even pressure distribution, and confirms when adjustment is complete without compromising extrusion quality.
3Adaptability or versatility
If the die is allowed to move for alignment adjustment, then the die can be repositioned, but differential pressure causes the die to move out of alignment during operation
Solution Approach 1:
The actuator serves as an intermediary mechanism between the die and the retaining structure. It mediates the transition between fixed and movable states, providing controlled movement capability when adjustment is needed while maintaining secure fixation during normal operation. This intermediary enables precise repositioning without allowing uncontrolled die movement.
Solution Approach 2:
The alignment indicators are pre-positioned to show the correct alignment position before adjustment begins. This preliminary setup guides the adjustment process, ensuring the die is repositioned accurately to the predetermined alignment position, preventing misalignment during the adjustment operation.
Data Source
AI summary
An extruder having an extruder crosshead, a die, and a die retaining assembly. The extruder crosshead has an annular major surface while the die has a first die surface facing and conformal to that major surface. The die also has a second die surface opposed to the first die surface. The die-retaining assembly is attached to the extruder crosshead, evenly and variably pressing the second die surface with controlled pressure such that the substantially opposing first die surface is pressed into the major surface of the extruder crosshead. The die-retaining also includes movable elements which abut the die in order to move the die. The die-retaining assembly can be used to evenly reduce the pressure exerted by over the second die surface so that the position adjustment elements can be used to more easily adjust the position of the die.