3D Molding Device with Pressure-Responsive Ejection Control
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Solution Overview
Problem
Existing three dimensional molding devices experience inaccuracies due to unexpected ejecting amounts of molten material caused by increased pressure in the flow path when the ejecting amount is decreased and subsequently increased by a flow amount adjustment mechanism like a butterfly valve.
Innovation Solution
A three dimensional molding device with a plasticizing section, nozzle, position changing section, and ejection adjustment section, controlled by a control section that adjusts the rotation speed of the screw and opening area of the flow path to manage the ejecting amount of plasticized material, using a butterfly valve to control the flow path opening and a pressure sensor to regulate the screw's rotation speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the ejecting amount is decreased by a flow amount adjustment mechanism, then the ejecting amount is reduced, but pressure in the flow path upstream increases as time elapses
Solution Approach 1:
The control section performs preliminary action by detecting pressure changes upstream of the flow amount adjustment mechanism and preemptively adjusting the screw rotation speed before the pressure buildup causes unexpected ejecting amount increases. This anticipatory control prevents the harmful pressure accumulation effect from manifesting.
Solution Approach 2:
The system implements feedback control by continuously monitoring pressure in the flow path upstream of the adjustment mechanism and using this information to dynamically adjust the screw rotation speed. This closed-loop control ensures that pressure variations are compensated in real-time, maintaining stable ejecting amount control.
2Quantity of substance
If the ejecting amount is increased after being decreased, then the ejecting amount is restored, but unexpected ejecting amount occurs due to increased pressure
Solution Approach 1:
The control section uses pressure feedback from sensors upstream of the flow amount adjustment mechanism to detect pressure buildup. When pressure increases are detected, the system automatically adjusts the screw rotation speed to compensate, ensuring that subsequent ejecting amount increases are precise and do not cause molding accuracy defects.
Solution Approach 2:
The system performs preliminary detection of pressure changes and preemptively adjusts operational parameters before the unexpected ejecting amount occurs. By monitoring pressure trends and acting in advance, the system prevents molding accuracy degradation before it happens.
3Ease of operation
If a flow amount adjustment mechanism is used to control ejecting amount, then ejecting amount control is achieved, but pressure accumulation affects subsequent ejecting precision
Solution Approach 1:
The system implements a feedback control loop that monitors pressure upstream of the flow amount adjustment mechanism and uses this information to adjust the screw rotation speed. This feedback mechanism compensates for pressure accumulation effects, maintaining reliable ejecting precision despite the use of flow amount adjustment.
Solution Approach 2:
The screw rotation speed acts as an intermediary control parameter that mediates between the flow amount adjustment mechanism and the final ejecting amount. By adjusting this intermediate parameter based on pressure feedback, the system compensates for disturbances introduced by the flow amount adjustment mechanism.
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 device ensures high accuracy in molding by preventing unexpected ejecting amounts and suppressing pressure-related inaccuracies, allowing for precise control of the ejecting material flow.
Implementation Method 1
a plasticizing section that has a screw in which a groove is formed and that is configured to generate a plasticized material by plasticizing a material by rotating the screw
Data Source
AI summary
This three dimensional molding device includes a plasticizing section having a screw in which a groove is formed and generating a plasticized material by plasticizing a material by rotating the screw; a nozzle having a nozzle opening and ejecting the plasticized material; an ejection adjustment section provided in a flow path, which communicates with the nozzle opening, and adjusting an ejecting amount of the plasticized material from the nozzle by adjusting an opening area of the flow path; and a control section, wherein the control section controls a rotation speed of the screw at a first rotation speed when the opening area is a first opening area and controls the rotation speed of the screw at a second rotation speed that is faster than the first rotation speed when the opening area is a second opening area that is larger than the first opening area.