Spiral Multiwire Buffer Tube for Precise WAAM Wire Feeding
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Solution Overview
Problem
Existing wire buffering systems in Wire Arc Additive Manufacturing (WAAM) face challenges in accurately advancing multiple wires simultaneously, leading to reduced deposition rates and increased complexity, particularly when handling exotic alloys that require precise control of multiple metal alloys entering a melt pool.
Innovation Solution
A multiwire buffer system that accumulates and dispenses multiple wires using a spiral buffer tube with flexible wire guides, a measurement head, and de-spooling motors, allowing for simultaneous advancement of wires with independent control over each alloy's deposition rate, enabling higher mass deposition rates and reduced system complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional wire buffering systems are used for multiple wires, then system complexity increases, but wire advancement accuracy decreases
Solution Approach 1:
The system divides multiple wire feeding operations into independent segments, with each wire having its own buffer tube and flexible wire guide that can operate independently. This segmentation allows each wire to be controlled separately while maintaining simplicity in the overall system architecture.
Solution Approach 2:
The buffer tube design serves multiple functions simultaneously: it acts as a measurement reference, a structural support, and a containment for the flexible wire guide. This multi-functionality reduces the need for separate components, thereby reducing system complexity while maintaining accuracy.
2Productivity
If multiple wires are advanced simultaneously in conventional systems, then deposition rate decreases, but control precision over each alloy is lost
Solution Approach 1:
Each wire is assigned a dedicated flexible wire guide within its own buffer tube, creating independent feeding channels. This segmentation enables simultaneous advancement of multiple wires while maintaining individual control over each alloy's deposition rate and precision.
Solution Approach 2:
The system incorporates measurement heads that continuously monitor the position and advancement of each wire independently. This feedback mechanism allows for real-time adjustment of each wire's feeding rate, ensuring precise control over each alloy while maintaining high deposition rates through parallel processing.
3Manufacturing precision
If wire buffer length is increased to improve accuracy, then system complexity and space requirements increase
Solution Approach 1:
The flexible wire guide is nested within the buffer tube, with the wire guide occupying the space between the outer cylinder and inner cylinder. This nested configuration allows the wire guide to extend along the buffer tube length, providing accurate buffering without requiring additional external components or increased overall system footprint.
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 multiwire buffer system significantly increases deposition speed and reduces system complexity by allowing multiple wires to be accurately fed into a deposition site, achieving higher mass deposition rates compared to conventional techniques, and enabling the use of exotic alloys with precise control over each alloy's entry into the melt pool.
Implementation Method 1
a flexible wire guide coupled to the entry passage, the flexible wire guide extending in a spiral around the inner cylinder and exiting the buffer tube through the exit passage
Implementation Method 2
the measurement head comprises a time-of-flight (TOF) sensor
Data Source
Figure 1
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Figure 3A~3D
AI summary
Wire buffer systems that can buffer one or more wires are described. The wire buffer system (300) can include a buffer tube (304). The buffer tube (304) can include entry passages (312), exit passages (314), an outer cylinder (308), and an inner cylinder (306). The inner cylinder (306) can be fixed in a position coaxial with the outer cylinder (308). Flexible wire guides (310) can be coupled to the entry passage (312). The flexible wire guide (310) can extend in a spiral around the inner cylinder (306) and exit the buffer tube (304) through the exit passage (314). The wire buffer systems can further include measurement systems (302). The measurement systems (302) can include time-of-flight (TOF) sensors, linear rails, and carriages.