Inkjet Coating Head Positioning for Sharp Boundaries on Convex Surfaces
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Solution Overview
Problem
Existing coating devices using inkjet methods face challenges in achieving high resolution, uniform coating quality, and clear boundaries between different coating layers on complex surfaces, particularly on vehicles with convex curved surfaces.
Innovation Solution
A coating device with a robot-mounted inkjet head that adjusts its position and discharge parameters to ensure precise coating on convex surfaces, using multiple heads with varying discharge sizes, densities, and gap configurations to enhance contrast and stability of coating layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single inkjet head is used for coating, then the device structure is simple, but the coating uniformity and boundary sharpness deteriorate on complex surfaces
Solution Approach 1:
The coating system is divided into multiple independent inkjet heads (first inkjet head and second inkjet head), each responsible for different regions or layers. This segmentation allows each head to be optimized for specific coating requirements, improving overall coating uniformity and boundary sharpness while maintaining manageable device complexity through modular architecture.
Solution Approach 2:
Different inkjet heads are configured with different discharge characteristics (first head with first discharge characteristics, second head with second discharge characteristics) to match different local requirements of the coating surface. This local quality approach ensures that each region receives appropriately tailored coating parameters, enhancing coating precision and uniformity across the entire surface.
2Area of stationary object
If the inkjet head is positioned far from the surface, then the coating coverage area is large, but the coating resolution and boundary sharpness deteriorate
Solution Approach 1:
The coating area is divided into multiple zones handled by different inkjet heads positioned at different distances from the surface. Heads closer to the surface provide high-resolution coating with sharp boundaries for critical regions, while heads positioned farther away cover larger areas with appropriate resolution, achieving both large coverage and sharp boundaries in different regions.
Solution Approach 2:
The system utilizes multi-dimensional positioning of multiple inkjet heads at different distances (Z-dimension) and positions (X-Y plane) to simultaneously achieve large coverage area and sharp boundaries. By distributing heads across different spatial dimensions, the system optimizes the trade-off between coverage area and boundary sharpness for different regions.
3Productivity
If the inkjet head moves quickly to increase productivity, then the coating speed is high, but the coating uniformity and resolution deteriorate
Solution Approach 1:
The coating process is divided into multiple parallel streams using multiple inkjet heads, allowing different heads to operate at different speeds optimized for their specific tasks. This segmentation enables high overall productivity while maintaining high resolution in critical areas where heads move more slowly and discharge precision coating.
Solution Approach 2:
The system employs dynamic control of inkjet head movement speeds and discharge parameters, adjusting velocity and discharge characteristics in real-time based on the specific coating requirements of different regions. This dynamic adaptation allows high-speed coating where uniformity is less critical while maintaining high resolution where boundaries and precision are required.
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
Improves coating quality by ensuring sharp boundaries, reduced unevenness, and enhanced appearance on convex surfaces, particularly on vehicle components like hoods and pillars.
Implementation Method 1
a head (10) including a nozzle surface (12) from which a coating material is discharged
Implementation Method 2
the head (10) moves while the coating material is discharged, thereby the to-be-coated object (30) is coated
Data Source
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AI summary
A coating device coats a coating region of a to-be-coated object having a convex curved surface. A coating device includes a head, an arm, and a controller. The head includes a nozzle surface. The arm holds the head. The controller controls movement of the head via the arm. A controller moves a head in a first direction along an end portion of a coating region in a posture in which a gap between a nozzle surface located on an end portion side of the coating region and a to-be-coated object is smaller than a gap between the nozzle surface located on a center side of the coating region and the to-be-coated object.