Extrusion Apparatus Transient Control for Ceramic Materials
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Solution Overview
Problem
Conventional extrusion processes for ceramic materials experience pressure spikes due to abrupt changes in operating parameters, leading to interrupted operations and substandard product quality, with materials produced during start-up and transient states often being discarded as waste.
Innovation Solution
The method involves adjusting the rotational rate of the screw and feed rate of the feeder in a controlled manner during a transient state to gradually reach a steady state, maintaining a constant screw fill ratio and limiting maximum pressure within the barrel to 10% of steady-state pressure, using a transient control system with a ramp controller and feedback mechanisms to manage these changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If abrupt changes in operating parameters are made during extrusion, then the time to reach steady state is reduced, but pressure spikes occur that interrupt operation and reduce product quality
Solution Approach 1:
The patent applies dynamics by making the operating parameters (screw rotational rate and feeder feed rate) time-dependent during the transient state. The parameters are continuously adjusted according to a predetermined profile rather than being fixed or abruptly changed, allowing the system to adapt smoothly from initial to steady-state conditions without causing pressure spikes that would interrupt operation.
Solution Approach 2:
The patent changes physical parameters (rotational rate and feed rate) in a controlled manner during the transient state. By adjusting these parameters according to a predetermined profile that limits pressure increases to no more than 10% above steady-state pressure, the system achieves steady state faster while maintaining operational reliability and avoiding disruptive pressure spikes.
2Loss of time
If abrupt changes in operating parameters are made during extrusion, then the time to reach steady state is reduced, but product quality is compromised due to pressure spikes
Solution Approach 1:
The patent applies dynamics by making the operating parameters (screw rotational rate and feeder feed rate) time-dependent during the transient state. The parameters are continuously adjusted according to a predetermined profile rather than being fixed or abruptly changed, allowing the system to adapt smoothly from initial to steady-state conditions without causing pressure spikes that would interrupt operation.
Solution Approach 2:
The patent changes physical parameters (rotational rate and feed rate) in a controlled manner during the transient state. By adjusting these parameters according to a predetermined profile that limits pressure increases to no more than 10% above steady-state pressure, the system achieves steady state faster while maintaining operational reliability and avoiding disruptive pressure spikes.
3Productivity
If conventional extrusion operation is used during transient state, then materials are produced but they must be discarded as waste due to substandard quality
Solution Approach 1:
The patent uses feedback by implementing a control system that monitors pressure during the transient state and adjusts the screw rotational rate and feeder feed rate accordingly. The control system ensures pressure increases are limited to no more than 10% above steady-state pressure, allowing continuous production of quality material throughout the transient state and eliminating the need to discard material during this period.
4Reliability
If controlled adjustment of operating parameters is made during transient state, then pressure spikes are minimized, but the complexity of the control system increases
Solution Approach 1:
The patent applies preliminary action by establishing a predetermined profile for adjusting operating parameters before the transient state begins. The profile specifies how the screw rotational rate and feeder feed rate should be adjusted as functions of time or material volume, allowing the control system to automatically execute the planned adjustments without complex real-time calculations, thus maintaining reliability while limiting complexity.
5Manufacturing precision
If controlled adjustment of operating parameters is made during transient state, then product quality is enhanced, but the time to reach steady state increases
Solution Approach 1:
The patent applies dynamics by making the operating parameters (screw rotational rate and feeder feed rate) time-dependent during the transient state. The parameters are continuously adjusted according to a predetermined profile rather than being fixed or abruptly changed, allowing the system to adapt smoothly from initial to steady-state conditions without causing pressure spikes that would interrupt operation.
Solution Approach 2:
The patent changes physical parameters (rotational rate and feed rate) in a controlled manner during the transient state. By adjusting these parameters according to a predetermined profile that limits pressure increases to no more than 10% above steady-state pressure, the system achieves steady state faster while maintaining operational reliability and avoiding disruptive pressure spikes.
Data Source
AI summary
Methods of operating an extrusion apparatus are provided for extruding ceramic or ceramic-forming material. The extrusion apparatus includes an extrusion die mounted with respect to a barrel. At least one screw is rotatably mounted within the barrel, and a feeder is configured to introduce a batch material to the screw. Example methods can adjust at least one of a rotational rate of the screw to an initial rotational rate or a feed rate of the feeder to an initial feed rate when based on a changed operating condition and/or when the batch material reaches the extrusion die. At least one of the rotational rate of the screw or the feed rate of the feeder can then be increased during a transient state until a steady state is reached.