Injector Nozzle Coating via Hot Isostatic Pressing
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Solution Overview
Problem
The existing methods for producing nozzles for internal combustion engines with corrosion-resistant coatings are complex, expensive, and require precise coupling, leading to non-uniform coating thickness and high production costs.
Innovation Solution
A method involving cutting cylindrical metal bars into nozzle blanks, applying a non-metallic protective disc, filling a containment tube with corrosion-resistant metal powder, compacting and sintering the powder using hot isostatic pressing, and machining to achieve a uniform corrosion-resistant coating without the need for a hollow body or precise coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hollow body with central core and outer wall is used to fill with powdered coating material, then the coating can be applied to the nozzle tip, but the production process becomes complex and expensive
Solution Approach 1:
The invention extracts and eliminates the complex hollow body structure (central core and outer wall) from the process. Instead of using a hollow body to contain the powdered coating material, the method applies powder directly to the external surface of a solid nozzle tip, thereby simplifying the production process while maintaining coating application capability
Solution Approach 2:
The process is segmented into distinct sequential steps: first inserting the solid nozzle tip into the containment tube, then adding powdered coating material that adheres to the tip surface, followed by HIP treatment. This segmentation allows each step to be optimized independently and simplifies the overall process compared to the integrated hollow body approach
2Shape
If precise coupling between tube and hollow bodies is required, then coating symmetry is achieved, but manufacturing precision requirements increase
Solution Approach 1:
The nozzle tip itself serves as the containment structure for the coating material during HIP treatment. The tip's geometry and the containment tube's geometry work together to naturally define the coating application zone, eliminating the need for precise coupling between separate components. The system self-regulates to achieve uniform coating thickness
Solution Approach 2:
The powdered coating material is applied locally to the external surface of the nozzle tip in a controlled manner. The containment tube provides local confinement exactly where needed (around the tip), allowing precise coating application without requiring precise coupling over the entire tube length. This localized approach reduces overall manufacturing precision requirements
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 method simplifies the production process, reduces costs, and ensures greater uniformity and precision in coating thickness, resulting in a more efficient and cost-effective nozzle with improved corrosion resistance.
Implementation Method 1
The containment tube with the nozzle blanks inserted inside is subjected to hot isostatic pressing, so that the metal powder is sintered and forms a body bound to the outer surface of the nozzle tips
Implementation Method 2
the metal powder is sintered and forms a body bound to the outer surface of the nozzle tips
Data Source
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AI summary
A method for producing a nozzle for injectors of internal combustion engines, comprising the steps of: - forming nozzle blanks (14) by machining, each having a cylindrical surface (16), a flat reference surface (18) at a first end of said cylindrical surface (16) and a nozzle tip (20) projecting from a second end of said cylindrical surface (16) and having a longitudinal axis (A), orthogonal to said flat reference surface (18), - applying a protective disc (22) onto said flat reference surface (18), - providing a containment tube (26) with a closed first end, - inserting, in sequence, said nozzle blanks (14) into said containment tube (26), - after the insertion of each nozzle blank (14) into said containment tube (26) filling the space between the tip of the nozzle (20) and the inner wall of the containment tube (26) with metal powder (32), - compacting the metal powder (32) and drawing air from a second end of the containment tube (26), - subjecting the containment tube (26) to a step of hot isostatic pressing (HIP), - successively cutting said containment tube (26), in the transverse direction, along cutting sections (44) aligned with said protective discs (22) so as to form separate sections (46), and - machining said sections (46) so as to form a metallic coating (52) on said nozzle tip (20).