Selective Laser Sintering Bed Temperature Control
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Solution Overview
Problem
Existing selective laser sintering (SLS) systems have limited temperature control, leading to nonlinear shrinkage and strength issues in manufactured parts.
Innovation Solution
An SLS system with a temperature sensor mounted on a biasable and adjustable mount, allowing precise monitoring and control of the bed surface temperature, using radiant heaters and a controller to maintain uniform temperature, and optionally employing multiple or pyrometer sensors for thermal mapping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If radiant heaters are used to preheat the powder material, then the laser can more easily raise the powder temperature to fusing point, but the bed surface temperature becomes difficult to control uniformly
Solution Approach 1:
The system employs temperature sensors (including pyrometers) that continuously monitor bed surface temperature and feed this data back to the controller. The controller adjusts radiant heater power based on this feedback to maintain uniform temperature distribution, preventing the nonlinear shrinkage that occurs with uncontrolled heating.
Solution Approach 2:
The bed surface is divided into multiple temperature zones, each monitored by separate temperature sensors and controlled by independently adjustable radiant heaters. This segmentation allows different regions to be heated to optimal temperatures for their specific material and geometry requirements, ensuring uniform overall temperature control.
2Adaptability or versatility
If the temperature sensor position is fixed, then the system structure is simpler, but the sensor cannot monitor different select points on the bed surface
Solution Approach 1:
The temperature sensor is mounted on a movable platform that can be repositioned to different locations on the bed surface. This dynamic positioning capability allows the same sensor to monitor multiple select points throughout the build process, providing monitoring flexibility without requiring multiple fixed sensors throughout the chamber.
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 solution provides improved temperature control, resulting in more linear shrinkage profiles and enhanced mechanical properties of the manufactured parts by maintaining a uniform bed temperature throughout the build process.
Implementation Method 1
a radiant heater disposed in the chamber and configured to heat at least a portion of the bed surface
Implementation Method 2
The temperature sensor is a pyrometer
Implementation Method 3
an irradiation source for irradiating select points in the powdered layer prepared most recently on the support platform
Implementation Method 4
electromagnetic radiation, for example from a CO2 laser, is used to bind a powder building material
Data Source
AI summary
A system for producing an object from a powder by selective laser sintering. The system includes a chamber and a support platform in the chamber. A spreader applies a layer of powder to a bed surface. An irradiation source irradiates select points in the powdered layer prepared on the support platform. A radiant heater heats at least a portion of the bed surface. A temperature sensor monitors the temperature of select points on the bed surface. A controller adjusts the radiant heater in response to temperature data provided by the temperature sensor.