Powder Circuit Control for Additive Manufacturing
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Solution Overview
Problem
Existing powder bed fusion apparatuses face challenges in maintaining reliable operation and reducing maintenance efforts, particularly in managing raw material powder circulation and preventing damage to conveying devices due to powder overload or lack thereof.
Innovation Solution
A powder circuit with a process chamber, powder application device, and a recirculation line equipped with a conveying device and sensor arrangement, where a control unit adjusts the conveying device's operation based on detected powder supply and discharge parameters to maintain optimal powder levels, preventing damage and ensuring reliable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a powder circulation line is implemented to recirculate excess raw material powder, then powder reuse and productivity are improved, but the risk of powder overload or lack thereof damaging the conveying device increases
Solution Approach 1:
The patent implements a feedback control system where sensors monitor powder levels in the circulation line and provide signals to a control unit. The control unit adjusts the conveying device operation based on this feedback, preventing both powder overload and powder starvation conditions that could damage the conveying device while maintaining efficient powder recirculation
Solution Approach 2:
The system monitors its own operational parameters (powder levels in circulation line) and automatically adjusts the conveying device to maintain optimal conditions. This self-regulating mechanism prevents damage without requiring external intervention, ensuring both reliability and continuous productivity
2Productivity
If the conveying device operates continuously to maintain powder circulation, then productivity is improved, but the risk of damage due to improper powder levels increases
Solution Approach 1:
Sensors continuously monitor powder levels in the circulation line and provide real-time feedback to the control unit. This enables the system to maintain continuous operation while dynamically adjusting the conveying device to prevent harmful conditions such as powder overload or insufficient powder supply
Solution Approach 2:
The control system anticipates potential harmful conditions by monitoring powder levels in advance. When sensors detect approaching critical levels, the control unit pre-adjusts the conveying device operation to prevent damage before it occurs, cushioning against potential harm through proactive control
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 enhances operational reliability and reduces maintenance needs by preventing conveying device damage through controlled operation based on real-time powder level monitoring, ensuring efficient powder circulation and reuse.
Implementation Method 1
a sensor arrangement (42) adapted to detect at least one of a parameter characteristic of a powder supply to the conveying device (38) and a parameter characteristic of a powder discharge from the conveying device (38)
Implementation Method 2
The raw material powder is conveyed through the powder circulation line by means of a conveying device (38) arranged in the powder circulation line (34)
Implementation Method 3
Operation of the conveying device (38) is controlled in dependence of at least one of the parameter characteristic of the powder supply to the conveying device (38) and the parameter characteristic of the powder discharge from the conveying device (38) by a control unit (40)
Data Source
AI summary
A powder circuit (36) for use in an apparatus (10) for producing three-dimensional work pieces by irradiating layers of a raw material powder with electromagnetic or particle radiation comprises a process chamber (12) accommodating a carrier (16) and a powder application device (14) for applying a raw material powder onto the carrier (16), the process chamber (12) being provided with a powder inlet (30) for supplying raw material powder to the powder application device (14) and a powder outlet (32) for discharging excess raw material powder from the process chamber (12). The powder circuit (36) further comprises a powder circulation line (34) connecting the powder outlet (32) of the process chamber (12) to the powder inlet (30) of the process chamber (12) and a conveying device (38) arranged in the powder circulation line (34) for conveying the raw material powder through the powder circulation line (34). A sensor arrangement (42) is adapted to detect at least one of a parameter characteristic of a powder supply to the conveying device (38) and a parameter characteristic of a powder discharge from the conveying device (38). A control unit (40) adapted to control operation of the conveying device (38) in dependence of at least one of the parameter characteristic of the powder supply to the conveying device (38) and the parameter characteristic of the powder discharge from the conveying device (38).