Variable-Capacity Powder Roller for Additive Manufacturing
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Solution Overview
Problem
Existing powder supply devices in additive manufacturing, which use a rotating roller with grooves, suffer from a constant powder supply in the axial direction, leading to surplus powder generation when the modeling surface has varying widths, reducing efficiency and recyclability.
Innovation Solution
A powder supply device with a cylindrical roller featuring groove portions of varying capacity along its axial direction, allowing for adjustable powder supply based on the modeling surface shape, preventing surplus powder accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a rotating roller with grooves is used for powder supply, then powder can be supplied continuously, but the powder supply amount in the axial direction is constant and cannot be adjusted
Solution Approach 1:
The groove portions in the roller are designed with varying capacities along the axial direction, creating local differences in powder storage capacity. This allows different regions of the roller to supply different amounts of powder, enabling adaptation to varying modeling surface widths while maintaining continuous supply.
Solution Approach 2:
The roller transitions from a static, uniform groove structure to a dynamic, variable-capacity groove structure. The groove capacities are intentionally designed to vary along the axial direction, allowing the system to dynamically adapt powder supply to match the contours of different modeling surface shapes.
2Device complexity
If a constant powder supply amount is used, then the supply mechanism is simple, but surplus powder is generated when the modeling surface width varies
Solution Approach 1:
Instead of a uniform groove design, the roller incorporates groove portions with locally optimized capacities. Each groove's capacity is tailored to the specific requirements of its position along the axial direction, minimizing surplus powder generation in regions where the modeling surface width varies, while keeping the overall mechanism relatively simple.
3Area of stationary object
If the roller length is increased to cover varying modeling surface widths, then the coverage area increases, but the powder supply amount in the axial direction remains constant
Solution Approach 1:
The roller is designed with groove portions that have different capacities at different axial positions. This local variation in groove capacity ensures that the powder supply amount is distributed appropriately along the axial direction, matching the varying width of the modeling surface without requiring a uniform increase in roller length.
Solution Approach 2:
The solution moves from considering only the axial dimension to incorporating the radial dimension through varying groove depths and capacities. This dimensional approach allows the roller to supply varying amounts of powder along its length, effectively matching the modeling surface width variations.
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
Enables precise powder distribution according to the modeling surface shape, reducing surplus powder and improving recyclability and powder quality while potentially reducing device size.
Implementation Method 1
The powder accumulated in the groove portions drops by the roller rotating
Data Source
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AI summary
A powder supply device includes a hopper accommodating powder, a cylindrical roller provided below the hopper and rotatable around a rotational axis, and a wall surface storing the powder in a space between the roller and the wall surface. The powder supply device moves the powder stored between the roller and the wall surface in a rotation direction of the roller and drops the powder by the roller rotating. A plurality of groove portions extending in an axial direction are formed in a peripheral surface of the roller. At least one of the groove portions is formed such that a capacity allowing the powder to be accommodated changes in the axial direction.