Powder Deposition Head Layout for Uniform Multi-Jet Welding
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Solution Overview
Problem
Existing material deposition units for laser build-up welding are sensitive to the distance and angle of the powder discharge device from the workpiece, and the distribution of powder over multiple discharge units is uneven, leading to inefficiencies in installation space and machining speed.
Innovation Solution
A material deposition unit with a powder division unit that distributes a central powder stream uniformly over multiple powder channels, each connected by exchangeable connecting elements, allowing for flexible positioning and reducing gravitational influence on powder jets, and featuring elongate powder discharge elements that reflect near-infrared radiation for reduced wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple powder discharge units are used to discharge powder onto the workpiece, then the powder distribution can be improved, but the sensitivity to distance and angle from the workpiece increases
Solution Approach 1:
The powder discharge device is divided into multiple independent powder discharge units, each with its own powder discharge element. This segmentation allows each unit to be independently optimized and adjusted, improving powder distribution uniformity while maintaining positioning flexibility through modular design.
Solution Approach 2:
The powder discharge elements are designed to be exchangeable and adjustable, allowing dynamic adaptation of the powder discharge system. This enables the system to maintain optimal performance across different working conditions and positions, reducing sensitivity to distance and angle variations.
2Manufacturing precision
If powder is discharged through multiple powder discharge units, then coverage is improved, but the installation space required increases
Solution Approach 1:
Multiple powder discharge units are integrated into a single consolidated powder discharge device structure. This merging approach achieves uniform powder distribution through multiple discharge points while minimizing the overall installation space by combining the units in a compact arrangement.
Solution Approach 2:
The powder discharge elements are arranged in a nested or compact configuration within the powder discharge device, allowing multiple discharge units to occupy minimal space while maintaining their individual functionality for uniform powder distribution.
3Reliability
If the powder discharge device is positioned closer to the workpiece to reduce gravitational influence, then powder jet stability is improved, but the sensitivity to positioning accuracy increases
Solution Approach 1:
Each powder discharge unit is equipped with locally optimized discharge elements that can be independently adjusted to account for local positioning variations. This local quality approach maintains powder jet stability while reducing sensitivity to overall positioning accuracy through localized compensation.
Solution Approach 2:
The exchangeable powder discharge elements are designed to self-adjust or be easily replaced to maintain optimal performance. This self-service capability allows the system to compensate for positioning variations without requiring high precision positioning, maintaining powder jet stability while reducing positioning sensitivity.
4Device complexity
If conventional powder discharge elements are used, then the structure is simple, but wear from laser radiation and powder flow is significant
Solution Approach 1:
The powder discharge elements are made from composite materials or materials with enhanced properties that resist wear from both laser radiation and powder flow. This maintains relatively simple structural design while significantly extending the service life of the discharge elements through superior material properties.
Solution Approach 2:
The powder discharge elements are designed as exchangeable, relatively simple components that can be easily replaced. This approach accepts shorter individual component life but maintains system simplicity and reduces overall complexity through modular, replaceable design that eliminates the need for complex wear-resistant structures.
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 configuration enhances the uniformity and flexibility of powder deposition, increasing machining speed and reducing wear, while allowing for easier maintenance and adjustment of the powder discharge elements.
Implementation Method 1
reducing gravitational influence on powder jets
Implementation Method 2
elongate powder discharge elements that reflect near-infrared radiation for reduced wear
Implementation Method 3
the same laser beam can melt the filler material, in particular the powder, at the stated distance from the melt pool and heat the melt pool
Implementation Method 4
at least one completely molten filler material is fed to a melt pool present on a surface to be machined
Data Source
AI summary
A material deposition unit includes a radiation unit designed to emit electromagnetic radiation in a directed manner onto a workpiece along a beam axis, and a powder discharge device that has multiple powder discharge units configured to discharge powder in a directed form onto the workpiece through powder-outlet openings. The material deposition unit further includes a powder division unit having multiple powder channels. A number of powder channels corresponds to a number of powder discharge units. The powder division unit is designed to distribute a central powder stream guided to a feed channel uniformly over the powder channels. Each respective powder channel is connected to a respective powder discharge unit by an exchangeable connecting element. At least one powder discharge unit has an exchangeable powder discharge element, which is elongate, has a first end and a second end, and is arranged at least partially within the corresponding powder discharge unit.