Rotatable Metering Element for Non-Rectangular Powder Layers
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Solution Overview
Problem
Existing additive manufacturing methods struggle to apply uniform powder layers with non-rectangular shapes, which is necessary for producing three-dimensional objects with complex geometries or multiple objects in a single build space.
Innovation Solution
A metering device with a rotatable metering element, designed to dispense building material in powder form in a metered manner, allowing for locally different amounts of powder to be applied along the direction of the axis, thereby enabling the creation of non-rectangular powder layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional recoater with uniform storage chambers is used, then the powder layer can be applied uniformly, but the recoating area is limited to rectangular shapes only
Solution Approach 1:
The storage chamber is divided into multiple independent sections along the longitudinal axis, each with independently adjustable depth. This segmentation allows different regions to dispense different amounts of powder, enabling non-rectangular recoating areas while maintaining precise metering control for each segment
Solution Approach 2:
Each section of the storage chamber is given a locally adapted powder depth according to the desired recoating area shape. This local quality approach allows the system to dispense varying powder quantities across different longitudinal positions, achieving both shape adaptability and metering precision
2Loss of substance
If the recoating area is reduced to match the object cross-section, then powder consumption is reduced, but the device complexity increases
Solution Approach 1:
The storage chamber configuration is made dynamically adjustable through independent section depth control. This allows the recoating area to be adapted to match different object cross-sections, reducing powder consumption for complex geometries while maintaining a relatively simple overall device structure that can be reconfigured rather than redesigned
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 allows for the efficient application of powder layers with non-rectangular shapes, reducing powder consumption and enhancing the cost-effectiveness and time-efficiency of the additive manufacturing process, especially when working with expensive powders.
Implementation Method 1
a metering element (30), which metering element is rotatable about an axis (A), preferably an axis of its own, particularly preferably about a longitudinal axis (A) and which dispenses the building material in powder form (15) in a metered manner
Implementation Method 2
a laser beam (22) which laser beam (22) is directed onto the building platform (12) in a selective manner, in particular in order to solidify the building material in powder form (15) at those positions
Implementation Method 3
a recoater (16) which can be moved over a build area (8) in a recoating direction (B) for applying a layer of the building material (15) in the build area (8)
Data Source
AI summary
A metering device serves as an equipping or retrofitting kit for a device for producing a three-dimensional object by means of solidifying, layer by layer, a building material in powder form at those positions that correspond to the cross-section of the object to be produced in the respective layer. The metering device has a metering element, which metering element is rotatable about an axis, preferably an axis of its own, particularly preferably about an, in particular its own, longitudinal axis and which is suitable for dispensing the building material in powder form in a metered manner. The metering element is designed to dispense locally different amounts of powder along the direction of the axis.