Dual Working Zone Additive Manufacturing Machine
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Solution Overview
Problem
Existing powder-based additive manufacturing technologies face issues with large and costly feed trays, limited working zone size, complexity, low productivity due to interrupted melting and layering processes, and difficulty in achieving homogeneous powder thickness and density.
Innovation Solution
A machine with two separate working zones and a common layering device that allows simultaneous melting in one zone while layering in the other, using gravity-fed powder distribution and metering with a scraper or roll, enabling continuous operation and improved powder distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single working zone is used with sequential layering and melting operations, then the machine structure is simpler, but productivity is reduced due to interrupted processes
Solution Approach 1:
The machine is divided into two separate working zones (first and second working zones) that can operate independently and simultaneously. Each zone has its own powder bed and can undergo layering or melting operations at the same time, eliminating the interruption between layering and melting processes and thereby improving productivity.
Solution Approach 2:
The dual working zone configuration enables continuous operation where while one zone is performing melting operations, the other zone performs layering operations. This eliminates idle time and ensures that the machine is continuously productive without interruption between process steps.
2Quantity of substance
If a large feed tray is used to store and deliver powder, then powder supply capacity is improved, but equipment cost and size increase considerably
Solution Approach 1:
The powder storage system transitions from a horizontal feed tray to a vertical hopper configuration. Powder is stored in a hopper positioned above the working zones and delivered downward via gravity, eliminating the need for large horizontal feed trays while maintaining adequate powder supply capacity.
Solution Approach 2:
The hopper is positioned at a height that utilizes gravity for powder delivery to both working zones. By establishing the storage point at an elevated position, powder flows naturally downward to the distribution points without requiring additional mechanical energy or complex feeding mechanisms.
3Manufacturing precision
If a scraper system with multiple rolls is used for powder distribution and compacting, then powder layer quality is improved, but machine complexity increases due to multiple controlled tools
Solution Approach 1:
A single distribution roll is designed to perform multiple functions: it distributes powder across the working zone, meters the powder quantity through its rotational control, and compacts the powder layer through its rolling action. This multi-functional approach eliminates the need for separate scraper systems and multiple rolls, reducing machine complexity while maintaining powder layer quality.
4Productivity
If the working zone length is increased to improve productivity, then output is improved, but the roll perimeter becomes insufficient for proper powder distribution
Solution Approach 1:
The distribution roll is designed to rotate multiple times over the working zone, with each rotation delivering a portion of the required powder. The roll serves itself by repeatedly traversing the working zone length, accumulating the total powder distribution over multiple passes rather than requiring the roll perimeter to match the full working zone length in a single pass.
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
Enhances productivity by allowing uninterrupted melting and layering processes, reduces equipment costs, and ensures homogeneous powder layers across the working zone.
Implementation Method 1
the storage means are positioned higher than the working zone, the feeding means utilize gravity
Implementation Method 2
additive manufacturing by sintering or melting powder using an energy beam acting on a powder layer
Implementation Method 3
using an energy beam such as electromagnetic radiation (for example a laser beam)
Implementation Method 4
using an energy beam such as electromagnetic radiation (for example a laser beam) or a beam of particles (for example an electron beam)
Data Source
AI summary
The machine is of the type which uses an energy beam which acts on a powder layer in a working zone. The machine has a device for layering said powder and which includes a means for storing powder, a means for distributing powder, a feeding means that transfers powder from the storage means to the distributing means, and a metering means that controls the quantity of powder transferred from storage means to distributing means. The storage means is positioned higher than the working zone, the feeding means utilizes gravity, and in use, the feeding means and the metering means move with the distributing means. The machine has two separate working zones and two separate working trays that move independently of one another. Each of the working trays is associated with only one working zone, and the layering device is common to both working zones.