Workpiece Surface Cleaning via Sensing-Controlled Powder Removal
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Solution Overview
Problem
Existing additive manufacturing processes, such as powder bed fusion, face challenges in efficiently removing residual unfused powder from the surfaces of workpieces, particularly from complex geometries and fine channels.
Innovation Solution
A system and method for surface cleaning of workpieces, which includes a housing with a holding structure to support the workpiece, a powder removal device to propel media for removing powder, a sensing device to detect surface characteristics, and a controller to selectively operate these components for targeted powder removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional cleaning methods are used to remove powder, then the process is simple, but it cannot effectively remove powder from complex geometries and fine channels
Solution Approach 1:
The cleaning system is divided into multiple independently controllable powder removal devices that can be selectively positioned and operated. Each device can be independently controlled to access different regions of the workpiece, enabling effective cleaning of complex geometries while maintaining manageable system complexity through modular architecture.
Solution Approach 2:
The system employs movable and repositionable powder removal devices that can dynamically adjust their positions and orientations. This dynamic capability allows the cleaning system to adapt to complex workpiece geometries and access hard-to-reach areas such as fine channels and recesses, significantly improving surface cleanliness without requiring a completely complex fixed structure.
2Manufacturing precision
If multiple powder removal devices are used to clean all surfaces, then cleaning effectiveness improves, but system complexity increases
Solution Approach 1:
Multiple powder removal devices are designed with universal capabilities to handle different workpiece geometries and surface types. Each device can perform multiple cleaning functions and can be selectively applied to different regions, reducing the need for highly specialized equipment for each specific cleaning task while maintaining high surface cleanliness across diverse geometries.
Solution Approach 2:
The system allows dynamic adjustment of operating parameters such as media type, pressure, and device positioning based on the specific cleaning requirements of different workpiece regions. This parameter flexibility enables effective cleaning of complex geometries using a standardized set of devices, improving surface cleanliness without proportionally increasing system complexity.
3Measurement precision
If automated sensing and control is implemented, then cleaning precision improves, but device complexity increases
Solution Approach 1:
The system incorporates sensing devices that detect surface characteristics and provide feedback to the control system. This feedback mechanism enables real-time adjustment of cleaning parameters and device positioning, significantly improving measurement precision of surface characteristics and cleaning effectiveness. The feedback loop allows the system to adapt to varying workpiece conditions without requiring overly complex predetermined programming.
Solution Approach 2:
The automated sensing and control system enables the cleaning process to self-regulate and self-optimize based on detected surface characteristics. The system can autonomously determine cleaning requirements, select appropriate devices and parameters, and adjust operations without extensive external intervention, improving measurement precision while keeping control complexity manageable through autonomous decision-making capabilities.
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 system effectively removes residual powder from workpieces, improving surface cleanliness and preparing components for further processing or use, while accommodating complex geometries and fine features.
Implementation Method 1
a first powder removal device within the enclosure, the first powder removal device configured to propel a first media toward the holding structure such that the first media contacts the workpiece
Implementation Method 2
selectively operate the first powder removal device to remove the powder material from the surface with the first media
Data Source
AI summary
Systems and methods are provided for cleaning surfaces of a workpiece. The system includes a housing defining an enclosure, a holding structure within the enclosure that is configured to support a workpiece, a first powder removal device that is configured to propel a first media toward the holding structure such that the first media contacts the workpiece while the workpiece is supported by the holding structure, a first sensing device that is configured to detect surface characteristics of the workpiece while the workpiece is supported by the holding structure, and a controller configured to, by a processor: detect a powder material on a surface of the workpiece based on the surface characteristics, and selectively operate the first powder removal device to remove the powder material from the surface with the first media while the workpiece is supported by the holding structure.