Cold Spray Powder Deposition for Additive Manufacturing
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Solution Overview
Problem
Current commercial powder bed laser fusion systems for additive manufacturing are slow due to the time-consuming process of spreading or rolling a new layer of powder after each layer is joined through laser welding.
Innovation Solution
The method involves cold spraying a powder onto a build area to create a densified powder layer, which is then machined to smoothness, inspected for defects, and fused using energy application, such as lasing, to efficiently build parts, allowing for faster manufacturing without the need to spread new powder across the entire build area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional powder bed laser fusion systems are used to create consolidated parts through metallurgical bonding, then part quality is achieved, but manufacturing speed is slow due to the time spent spreading or rolling a new layer of powder after each layer is joined
Solution Approach 1:
The build area is divided into multiple zones with different powder deposition strategies. Some regions use traditional layer-by-layer powder spreading, while other regions use cold spray deposition for faster material placement. This segmentation allows the system to optimize for speed in certain areas while maintaining quality control in others, thereby improving overall manufacturing productivity without sacrificing part quality.
2Productivity
If cold spray powder deposition is used to create densified powder layers, then manufacturing speed increases and material usage decreases, but the process requires integration with high speed machining and inspection systems
Solution Approach 1:
The system merges cold spray deposition, high speed machining, interferometric inspection, and laser fusion operations into a single integrated additive manufacturing system. By combining these previously separate processes into one coordinated system, the patent eliminates the need for multiple separate machines and manual operations, thereby reducing overall system complexity despite the advanced capabilities involved.
Solution Approach 2:
The system incorporates automated inspection and adaptive control features that allow the process to self-correct and optimize without external intervention. The interferometric system automatically detects surface deviations, and the control system adjusts subsequent deposition parameters accordingly, reducing the need for manual monitoring and adjustment.
3Loss of substance
If conventional powder spreading methods are used, then the entire build area must be covered with powder, but this consumes more material and increases process time
Solution Approach 1:
The system applies powder deposition locally only where material is needed to build the part, rather than covering the entire build area. The cold spray nozzle deposits material precisely on the regions requiring addition, and the selective laser fusion process targets only the deposited powder in those specific locations. This local quality approach minimizes material consumption while maintaining manufacturing efficiency.
Data Source
AI summary
An additive manufacturing method includes cold spraying a powder onto a build area to create a densified powder layer. The method can include high speed machining the densified powder layer after cold spraying to create a smooth layer.