Powder Bed Levelling System with Support Surface and Drive Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In three-dimensional printing, existing leveling systems for powder beds often mix different materials during the leveling process, which can harm the physical or chemical characteristics of the printed object, and fail to prevent powder from returning to the bed after cutting, disrupting the structure.
Innovation Solution
A system and method that utilize a cutting device with a support surface to ensure cut powder is driven towards an outlet, using a drive system that only moves powder in contact with the support surface, preventing it from returning to the powder bed, and incorporating actuators and oscillation mechanisms to efficiently remove powder without disturbing the underlying structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a leveling system is used to level the powder bed, then the surface flatness is improved, but different materials may be mixed together harming the physical or chemical characteristics
Solution Approach 1:
The leveling system is divided into functionally independent modules: a cutting device that separates excess powder from the build area, a support surface that receives cut powder, and a drive system that removes powder from the support surface. This segmentation prevents mixing of different materials by isolating the removal function from the build area.
Solution Approach 2:
The cutting device extracts and removes excess powder from the powder bed at the boundary of the build area. By taking out the powder removal function and separating it from the leveling process, the system prevents contamination of the build area with removed powder while maintaining surface flatness.
2Productivity
If the drive system moves all powder in the bed, then powder removal efficiency is improved, but the structure of the powder bed is disturbed
Solution Approach 1:
The drive system is designed to act only locally on powder that has been transferred to the support surface, not on the entire powder bed. This localized action removes powder efficiently from the support surface while leaving the build area and its powder structure undisturbed.
Solution Approach 2:
The support surface acts as an intermediary between the cutting device and the drive system. It receives cut powder from the cutting device and presents it to the drive system for removal, thereby isolating the drive system's action from the powder bed structure and preventing disturbance.
3Speed
If the cutting line moves quickly through the powder bed, then leveling speed is improved, but cut powder may return to the powder bed
Solution Approach 1:
The support surface is positioned downstream of the cutting line and moves to receive cut powder before it can fall back into the powder bed. This preliminary positioning and movement of the support surface ensures that cut powder is captured immediately, preventing it from returning to the build area even at high cutting speeds.
Solution Approach 2:
The system replaces reliance on gravity alone for powder removal with an active drive system that positively moves powder from the support surface to the removal location. This mechanical substitution ensures rapid and complete powder removal that keeps pace with high-speed cutting operations.
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 solution effectively prevents mixing of different materials in the powder bed, maintains the integrity of the powder bed structure, and ensures efficient powder removal without disturbing the underlying layers or objects being printed, enhancing the precision and quality of three-dimensional printing.
Implementation Method 1
The support surface is preferably located rearward of the line of cut relative to movement of the cutter in the first direction. This allows the cut powder to come into contact with the support surface by inertia and/or by contact with particles of powder downstream.
Data Source
Figure 1~2
Figure 3a~3c
Figure 3d~4a
AI summary
The present invention relates to a system and a method for levelling a powder bed (91). The system comprises a cutting device (10) comprising a cutting line (11) and a support surface (17). The powder bed (91) is cut by the cutting line (11) which moves in a first direction (201) such that the cut powder ends up in contact with the support surface (17), where it is drawn towards an outlet (5) by a powder entrainment system.