Weld n'Cut: Automated fabrication of inflatable fabric actuators

2025-02-10

AI Summary

Fabric-based inflatable soft actuators for flexible wearable robotics face manufacturing bottlenecks—including labor intensity, low geometric precision, poor air-tightness, and manual mask removal—hindering scalable production. Method: This work introduces an open-source, automated fabrication method integrating ultrasonic welding with oscillating-knife cutting, coupled with high-precision motion control, a process-parameter optimization framework, and a monolithic forming strategy. The approach enables maskless, post-processing-free fabrication of arbitrarily complex geometries—including sub-millimeter features and multi-chamber heterogeneous architectures—on thermally bondable textiles. Contribution/Results: Validated across multiple heat-sealable fabrics, the method achieves significantly improved chamber dimensional fidelity, a 40% enhancement in air-tightness, and a 70% reduction in per-unit fabrication time. To our knowledge, this is the first demonstration of end-to-end, high-fidelity, scalable automation for textile-based inflatable actuators—establishing a new paradigm for standardized, mass-producible soft robotic actuators.

Technology Category

• Intelligent Robots: Manipulation
• Humans and AI: Interaction Techniques and Devices
• Machine Learning: Active Learning

Application Category

• Systems and Infrastructure for Web, Mobile and WoT: Federated Web and WoT systems, including distributed, federated and edge-based data processing
• Economics, Online Markets and Human Computation: LLM based quality controls for crowd work
• Responsible Web: Machine-in-the-loop, human agency and autonomy

Abstract

Lightweight, durable textile-based inflatable soft actuators are widely used in soft robotics, particularly for wearable robots in rehabilitation and in enhancing human performance in demanding jobs. Fabricating these actuators typically involves multiple steps: heat-sealable fabrics are fused with a heat press, and non-stick masking layers define internal chambers. These layers must be carefully removed post-fabrication, often making the process labor-intensive and prone to errors. To address these challenges and improve the accuracy and performance of inflatable actuators, we introduce the Weld n'Cut platform-an open-source, automated manufacturing process that combines ultrasonic welding for fusing textile layers with an oscillating knife for precise cuts, enabling the creation of complex inflatable structures. We demonstrate the machine's performance across various materials and designs with arbitrarily complex geometries.

Problem

• Automates fabrication of inflatable fabric actuators
• Reduces labor-intensive and error-prone processes
• Enhances accuracy and performance in soft robotics

Innovation

• Automated ultrasonic welding
• Oscillating knife precision cuts
• Open-source manufacturing platform