Continuous Powder Bed Printing for Long High-Resolution Structures
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Solution Overview
Problem
Current additive manufacturing machines, particularly those using powder bed fusion, are limited in part size, manufacturing cost, resolution of part details, and throughput due to constraints in laser power and energy distribution, which hinder the production of large, high-resolution structures efficiently.
Innovation Solution
The proposed method involves an additive manufacturing system with multiple energy sources, including lasers and electron beams, that use beam shaping optics and patterning units to direct energy beams efficiently, allowing for the creation of large structures by sequentially advancing parts through zones for amalgamation and removal of granules, and utilizing rejected energy for reuse, thereby enhancing throughput and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If laser power is increased to scale up material throughput rate, then productivity is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent divides the additive manufacturing process into separate zones: a first zone for selective amalgamation of granular material and a second zone for removal of unamalgamated granules. This segmentation allows the laser to operate at optimal power levels for high-resolution printing while a separate cleaning mechanism handles material removal, eliminating the need for excessive laser power scaling.
Solution Approach 2:
The patent introduces a conveyor system as an intermediary that transports the powder bed through different processing zones. This mediator enables continuous processing with optimized laser exposure in the first zone and mechanical removal in the second zone, improving throughput without increasing laser power requirements.
2Volume of stationary object
If part size is increased to produce large structures, then volume of stationary object is improved, but manufacturing time increases
Solution Approach 1:
The patent implements a continuous additive manufacturing process where the conveyor system continuously transports the powder bed through the laser processing zone and the granule removal zone without interruption. This continuous operation enables production of large parts by sequentially adding material layers while simultaneously removing unamalgamated granules, dramatically reducing manufacturing time compared to traditional batch processing.
Solution Approach 2:
The patent performs preliminary amalgamation of selected granules in the first zone before the powder bed reaches the second zone. This preliminary action ensures that only the necessary material is processed and bonded, while unamalgamated granules are pre-positioned for efficient removal, streamlining the overall manufacturing process for large structures.
3Use of energy by moving object
If laser spot size is increased to maintain optimum power flux at higher power, then use of energy is improved, but manufacturing precision deteriorates
Solution Approach 1:
The patent applies different processing conditions to different regions of the powder bed by using selective laser scanning that targets only the specific areas where granule amalgamation is required. This localized energy application maintains high power flux density at the laser spot for efficient melting and bonding, while the overall system handles large part volumes through continuous conveyor operation and selective zone processing.
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 the production of large, high-resolution structures with increased throughput and reduced manufacturing time and cost, overcoming the limitations of traditional systems by optimizing energy distribution and reuse, allowing for parts exceeding 10 meters in length and improving overall efficiency.
Implementation Method 1
a laser selectively melts and fuses powder material... to form a continuous part
Implementation Method 2
beam shaping optics and patterning units to direct energy beams efficiently
Data Source
AI summary
A method of additive manufacture suitable for large and high resolution structures is disclosed. The method may include sequentially advancing each portion of a continuous part in the longitudinal direction from a first zone to a second zone. In the first zone, selected granules of a granular material may be amalgamated. In the second zone, unamalgamated granules of the granular material may be removed. The method may further include advancing a first portion of the continuous part from the second zone to a third zone while (1) a last portion of the continuous part is formed within the first zone and (2) the first portion is maintained in the same position in the lateral and transverse directions that the first portion occupied within the first zone and the second zone.