Dynamic Blade Speed Control for Powder Bed Lamination
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Solution Overview
Problem
Existing lamination molding apparatuses face inefficiencies in recoating due to slow blade feed speeds, leading to increased time loss and potential damage when dealing with protrusions in sintered layers.
Innovation Solution
A lamination molding apparatus that includes a blade, a laser irradiating device, and a numerical control system to adjust the blade's feed speed dynamically based on the laser irradiation range, allowing faster movement outside the irradiation area and minimizing recoating time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the blade feed speed is reduced to prevent damage when impacting protrusions, then the reliability of the blade and sintered layer is improved, but the productivity of the recoating process deteriorates
Solution Approach 1:
The blade feed speed is dynamically adjusted based on the presence of protrusions in the sintered layer. The control unit detects protrusions and automatically reduces the feed speed only in regions where protrusions are present, while maintaining higher speeds in safe regions. This dynamic speed adjustment resolves the contradiction by adapting the feed speed to actual conditions rather than using a uniformly slow speed throughout the entire recoating process.
Solution Approach 2:
Different feed speeds are applied to different regions of the sintered layer based on local conditions. Regions with protrusions receive reduced feed speed to prevent blade damage, while regions without protrusions maintain higher feed speeds for improved productivity. This local differentiation allows the system to optimize both reliability and productivity simultaneously by treating different areas according to their specific characteristics.
2Reliability
If the blade feed speed is reduced to ensure safe recoating over protrusions, then the reliability is improved, but the time required for recoating increases
Solution Approach 1:
The feed speed is dynamically modified in real-time based on protrusion detection. When protrusions are detected, the feed speed is reduced only in those specific areas; when no protrusions are present, the feed speed remains high. This dynamic adjustment minimizes the overall recoating time while ensuring reliable processing where needed, resolving the time-reliability contradiction.
Solution Approach 2:
The feed speed parameter is changed based on the detected conditions of the sintered layer. The control unit modifies the feed speed parameter from a high default value to a lower value only when protrusions are detected in the ahead region. This parameter change strategy reduces recoating time overall while maintaining reliability where necessary.
3Productivity
If the blade moves at high speed, then the productivity is improved, but the risk of blade damage or sintered layer separation increases
Solution Approach 1:
The control unit performs preliminary detection of protrusions in the ahead region before the blade arrives. Based on this advance information, the feed speed is pre-adjusted to appropriate levels. This preliminary action allows the blade to move at high speed in safe regions while automatically reducing speed before encountering protrusions, thus improving productivity without increasing damage risk.
Solution Approach 2:
The system uses feedback from protrusion detection to continuously adjust the feed speed. The detection unit monitors the sintered layer condition and provides feedback to the control unit, which then modifies the feed speed accordingly. This feedback mechanism enables high-speed operation when safe while automatically reducing speed when protrusions are detected, resolving the contradiction between productivity and damage risk.
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 enables accurate formation of the powder layer at the irradiation region with reduced recoating time and minimized risk of blade damage, thereby shortening the overall molding time.
Implementation Method 1
a laser irradiating device (40) for irradiating a laser beam at a predetermined irradiation region in the molding region
Implementation Method 2
irradiating a laser beam so as to sinter a predetermined irradiation region of the powder layer
Data Source
AI summary
A lamination molding apparatus 10 includes a powder layer forming apparatus 20, a recoating head 30, a servo motor 16, a laser irradiating device 40, a numerical control apparatus 52, a laser control apparatus 54 and a computer aided manufacturing (CAM) system 56. The blade 31 moves in the horizontal axis direction so as to form the powder layer on a predetermined molding region. The laser control apparatus 54 controls the laser irradiating device 40 and calculates an irradiation range of a laser beam for every powder layer. The numerical control apparatus 52 obtains data of the irradiation range from the laser irradiating device 40 and outputs a move command such that the blade 31 moves at a feed speed faster than a pre-set feed speed adapted for recoating, in the molding region outside of the irradiation range.