3D Additive Manufacturing Thermal Control via Predictive Heat Input
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In three-dimensional additive manufacturing using powder sintering, controlling the temperature of the modeled surface in real time is challenging due to rapid cooling and heat radiation, leading to issues like powder scattering, crystal distortion, and defects in the model, as the existing methods fail to ensure the surface is at the desired temperature before new powder is spread.
Innovation Solution
A three-dimensional additive manufacturing device with a control unit that calculates the required heat input based on the heat capacity of the powder layer to set the temperature at a desired level at a future time, using a beam generating unit to input the necessary heat, ensuring the surface is at the correct temperature for subsequent powder spreading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the modeled surface is heated to high temperature to prevent powder scattering, then powder adhesion is improved, but heat radiation and rapid cooling cause temperature instability and crystal distortion
Solution Approach 1:
The system performs preliminary heating of the modeled surface before powder spreading to ensure proper adhesion, then calculates and applies additional heat input in advance of when the temperature is predicted to drop below the threshold, proactively preventing temperature instability rather than reactively correcting it
Solution Approach 2:
The system continuously monitors the modeled surface temperature and uses this feedback to dynamically adjust the heat input from the electron beam, creating a closed-loop control system that maintains temperature stability despite heat radiation and cooling effects
2Temperature
If the electron beam irradiation time is extended to maintain surface temperature, then temperature stability is improved, but production efficiency decreases due to longer processing time
Solution Approach 1:
The system dynamically adjusts the electron beam irradiation time based on real-time temperature measurements and predictive calculations, optimizing the heating duration for each specific condition rather than using fixed extended irradiation times, thereby maintaining temperature stability while minimizing processing time
Solution Approach 2:
The system changes the irradiation time parameter dynamically based on calculated heat capacity and temperature predictions, adjusting this critical parameter to achieve the optimal balance between temperature maintenance and production efficiency for each modeling step
3Temperature
If the heat input is increased to compensate for heat radiation, then temperature maintenance is improved, but energy consumption increases
Solution Approach 1:
The system applies partial heat input rather than excessive heating by calculating the precise amount of energy needed to maintain temperature, avoiding unnecessary energy consumption while still achieving the desired temperature maintenance through optimized, minimal sufficient heating
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 approach effectively prevents powder scattering and ensures consistent heat input, reducing heat stress and crystal distortion, resulting in higher quality models with improved melting and reduced defects.
Implementation Method 1
When the electrons are trapped and stopped on a surface layer of the spread metallic powder 9n, the kinetic energy which the electrons have been holding until then is converted into a quantity of heat for melting the metallic powder 9n.
Implementation Method 2
using a beam generating unit to input the necessary heat, ensuring the surface is at the correct temperature for subsequent powder spreading
Data Source
AI summary
An aspect of the present invention includes: a base plate that moves along a vertical direction; a powder feeding unit that laminates a powder layer on an upper surface of the base plate; a beam generating unit that generates a beam in a designated quantity of heat; and a control unit that causes the beam generating unit to irradiate a designated position of the powder layer with the beam in a scan order programmed based on three-dimensional model data. The control unit calculates a required quantity of heat to be input to the designated position, based on heat capacity of the designated position of the powder layer, to set a temperature of the designated position at a desired temperature at a future designated time, and the control unit controls the beam generated by the beam generating unit to enable input of the required quantity of heat to the designated position.