3D Molding Screw Control for Stable Resume Ejection
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Solution Overview
Problem
Existing three-dimensional molding devices face instability in the pressure and ejection amount during the transition from stopping to resuming material ejection due to the butterfly valve mechanism, leading to inconsistent line widths.
Innovation Solution
Implementing a control system that adjusts the rotation speed of the screw in multiple stages during both the ejection stopped period and the resume ejection period to stabilize the internal pressure and ejection amount, using a control section to manage the ejection rate adjustment mechanism and suction mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a butterfly valve is used as a flow rate adjustment mechanism to control ejection amount, then the ejection rate can be adjusted, but the pressure in the flow path becomes unstable during transition periods, causing inconsistent ejection amounts
Solution Approach 1:
The patent changes the operating parameters of the screw by adjusting rotation speed in multiple stages during ejection stopped and resume periods. This parameter change stabilizes the pressure in the flow path upstream of the flow rate adjustment mechanism, ensuring consistent ejection amounts when ejection resumes without compromising the ability to control ejection rates.
2Ease of operation
If the screw rotation speed is kept constant during ejection stopped period, then the system is simple to operate, but the pressure does not stabilize quickly, leading to unstable ejection upon resumption
Solution Approach 1:
The patent makes the screw rotation speed dynamic by changing it in multiple stages during specific periods (ejection stopped period and resume ejection period). This dynamic adjustment stabilizes pressure quickly, ensuring consistent ejection amounts when ejection resumes, while the control section automates the process to maintain ease of operation.
3Adaptability or versatility
If the ejection rate adjustment mechanism adjusts the flow path opening degree, then the ejection amount is controlled, but during resume period before reaching designated opening degree, pressure instability causes inconsistent line widths
Solution Approach 1:
The patent performs preliminary action by changing the screw rotation speed in multiple stages during the ejection stopped period and resume ejection period, before the flow path opening degree reaches its designated value. This preliminary pressure stabilization ensures that when ejection resumes and the opening degree reaches the target, the pressure is already stable, producing consistent line widths.
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
Stabilizes the ejection amount and maintains consistent line widths by quickly adjusting the internal pressure to appropriate levels, ensuring precise molding outcomes.
Implementation Method 1
a screw and a motor configured to rotate the screw and that plasticizes a material to generate a plasticized material
Data Source
AI summary
The three dimensional molding device includes a plasticization section that has a screw and that generates a plasticized material, a nozzle that has nozzle opening and that ejects the plasticized material, an ejection rate adjustment mechanism that communicates with the nozzle opening, the ejection rate adjustment mechanism controlling the ejection rate of the plasticized material from the nozzle opening by adjusting an opening degree of a flow path, and a control section, wherein the control section executes at least one of a first control for changing the rotation speed of the screw in multi-stages during an ejection stopped period, which is a period after ejection of the plasticized material from the nozzle opening is stopped and before ejection of the plasticized material from the nozzle opening is resumed, and a second control for changing the rotation speed of the screw in multi-stages during a resume ejection period, which is a period after ejection of the plasticized material from the nozzle opening is resumed and before the opening degree of the flow path reaches an opening degree designated for the ejection rate adjustment mechanism and in the second control, the control section decreases and then increases the rotation speed of the screw.