Pressure-Equalized Powder Refilling for Continuous LMD Feeders
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Solution Overview
Problem
Existing powder feeders for laser metal deposition (LMD) processes face inefficiencies due to limited hopper capacity, requiring frequent refilling, which disrupts the manufacturing process and leads to inconsistent powder flow, affecting the quality and continuity of the additive manufacturing process.
Innovation Solution
A powder feeding system with a refilling hopper that maintains equal pressure with the main hopper, allowing continuous refilling without stopping the process, using a controller to manage the flow and pressure, ensuring consistent powder supply through a positive displacement feeder or screw type feeder, and incorporating sensors and valves for precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the hopper capacity is increased to reduce refilling frequency, then the manufacturing continuity is improved, but the device complexity and space requirements increase
Solution Approach 1:
The powder storage system is segmented into multiple independent hoppers (main hopper and at least one auxiliary hopper), each capable of storing powder separately. This segmentation allows the system to maintain continuous operation by switching between hoppers, effectively increasing total storage capacity without requiring a single large complex hopper.
Solution Approach 2:
A switching mechanism acts as an intermediary between multiple hoppers and the powder delivery system. This intermediary component enables seamless transition between hoppers, maintaining manufacturing continuity while managing system complexity through a centralized control point rather than requiring complex integration throughout the entire system.
2Loss of time
If the hopper capacity is increased to reduce refilling frequency, then the refilling frequency is reduced, but the space required for installation increases
Solution Approach 1:
Instead of using one large hopper that would require significant space, the system segments storage into multiple smaller hoppers. These can be arranged in a compact configuration (vertically or horizontally), reducing the overall footprint while maintaining adequate total storage capacity to reduce refilling frequency.
Solution Approach 2:
Multiple hoppers can be arranged in a nested or stacked configuration, where auxiliary hoppers are positioned to utilize vertical space or fill gaps around the main hopper. This nesting approach maximizes storage capacity within a minimized installation footprint.
3Reliability
If multiple powder feeders are used in parallel to ensure continuous supply, then the powder supply continuity is improved, but the system cost and complexity increase
Solution Approach 1:
The system segments powder storage into multiple hoppers but uses a single powder feeder mechanism. This segmentation approach provides redundancy and continuity similar to having multiple feeders, while avoiding the complexity and cost of duplicating the entire feeder system.
Solution Approach 2:
A switching mechanism serves as an intermediary that directs powder flow from different hoppers through a single feeder. This intermediary component provides the reliability of multiple sources while maintaining the simplicity of a single delivery path, avoiding the complexity of managing multiple parallel feeder systems.
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
Ensures a constant and continuous powder flow, maintaining manufacturing efficiency and quality by avoiding disruptions during refilling, particularly beneficial for high-rate additive manufacturing processes.
Implementation Method 1
maintains equal pressure with the main hopper, allowing continuous refilling without stopping the process
Implementation Method 2
Typically, the powder is drawn or pushed out of a powder reservoir via the action of a rotating wheel driven by a motor
Data Source
AI summary
Examples refer to powder feeding systems including a powder feeder connectable to a laser metal deposition equipment, the powder feeder having a feeding hopper to store powder, a first powder outlet through which powder is feed to the laser metal deposition equipment and a first powder inlet, a refilling hopper to store additional powder that includes a second powder outlet connected to the first powder inlet through which the additional powder is provided to the feeding hopper and a pressure generation component to generate an operating pressure level inside the feeding hopper. The system also includes a controller that, during normal operation of the powder feeder and upon reception of a refilling signal, causes the generation of a pressure level inside the refilling hopper substantially equal to the operating pressure level and causes the passage of additional powder from the refilling hopper to the feeding hopper.