Thermal Spray Torch Oscillation for Coating Precision
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Solution Overview
Problem
Traditional thermal spray technologies face challenges in efficiently coating large or irregular surfaces due to high required speeds, leading to stress, potential breakage, material waste, and inefficiencies in deposition processes.
Innovation Solution
Implementing a method that combines slow linear advancement of the torch with oscillation of the deposition jet perpendicular to the advancement direction, allowing for a wider spray pattern and reduced speed, thereby improving coating control and precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the robot moves the torch at high speed to prevent overheating and control deposit thickness, then the coating quality is maintained, but the robot experiences greater stress and possible breakage
Solution Approach 1:
The coating process is segmented into multiple passes with the torch oscillating laterally during each pass. This segmentation allows the robot to move slower while still achieving uniform coating distribution through the oscillation motion, reducing mechanical stress on the robot system
Solution Approach 2:
The torch is equipped with an oscillation mechanism that dynamically adjusts the spray pattern width by varying the oscillation amplitude. This dynamic adjustment allows the torch to cover wider areas per pass at reduced speeds, improving robot reliability while maintaining coating precision
2Manufacturing precision
If the robot moves at high speed to control deposit thickness, then overheating is prevented, but material is wasted during direction changes and reversals
Solution Approach 1:
The torch oscillates laterally during each pass to pre-distribute the coating material across the target area before the robot completes the pass. This preliminary distribution reduces the need for material application during direction changes and reversals, minimizing material waste
Solution Approach 2:
The oscillation mechanism ensures continuous and uniform material deposition throughout the entire pass, eliminating gaps and overlaps that occur during traditional high-speed direction changes. This continuous action maintains precise thickness control while reducing material waste at reversal points
3Manufacturing precision
If the torch spray pattern is narrow to maintain precision, then coating accuracy is improved, but the processing time increases for large surfaces
Solution Approach 1:
The torch oscillation adds a lateral dimension to the spray pattern, transforming a narrow linear deposit into a wider distributed coating. This dimensional change allows the torch to cover more area per pass while maintaining precision through controlled oscillation motion
Solution Approach 2:
The oscillation mechanism dynamically changes the effective spray pattern width by varying the oscillation amplitude and frequency. This parameter change allows the system to widen the coverage area without sacrificing coating precision, thereby improving processing speed for large surfaces
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 precise control over coating thickness, reduces localized temperature fluctuations, conserves materials, and minimizes wear on deposition equipment, allowing for continuous spraying without interruptions and reducing overall processing time.
Implementation Method 1
The plasma is continuously supported by the supply of new plasmagenic gas; once fully operating, the plasma takes the form of a cylindrical flame exiting from the nozzle. The temperature reached by the plasma is of the order of 9000 ÷ 20000 K.
Implementation Method 2
The principle of Thermal Spray technologies consists in administering energy to the material to be deposited until it is brought to melting and then transport it toward the substrate to be coated.
Implementation Method 3
it is conveyed by the flame and accelerated against the substrate, against which it strikes and proceeds to rapid solidification.
Data Source
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AI summary
Method of deposition of a coating on a surface of a workpiece, working with at least one deposition device, or torch, of Thermal Spray type, controlled by an associated motor. It is contemplated to perform the deposition step by configuring the torch so as to create two concurrent movements, of which a first movement along a linear path on the surface area to be coated; a second oscillation movement according to an axis of rotation coaxial with said advancement direction; this allows increasing the spray pattern of the thermal spray torch at each stroke resulting in a reduction of the relative movement speed of the torch itself.