Partially Coated Sphere Orientation for Fuel Injector Welding
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Solution Overview
Problem
The manufacturing of fuel injectors is hindered by the challenge of rapidly and accurately orienting partially coated spherical valve-members, as existing methods require multiple manipulations to avoid coating contamination during welding, increasing manufacturing time and part handling.
Innovation Solution
An apparatus comprising a pedestal, camera, and controller that rotates and images the partially coated spherical-object to detect a zero-curvature boundary-line, determine polar-axis-angle, and ensure the coating's height and linearity meet specifications, facilitating precise orientation and transfer into a conical-fixture for welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple manipulations are used to orient the partially coated spherical valve-member, then the coating contamination during welding is avoided, but the manufacturing time increases and part handling complexity increases
Solution Approach 1:
The coating is applied in advance to specific regions of the spherical valve-member before assembly, creating a pre-coated component that requires minimal manipulation during welding. The coating pattern is designed beforehand to protect critical surfaces while exposing welding areas, eliminating the need for multiple repositioning operations during the welding process.
Solution Approach 2:
The spherical valve-member is divided into distinct functional zones with different coating requirements: wear surfaces receive protective coating while welding surfaces remain uncoated. This segmentation allows the component to be welded in a single fixed position without requiring manipulation to expose different surfaces, thereby preventing contamination while reducing handling steps.
2Reliability
If multiple manipulations are used to orient the partially coated spherical valve-member, then the coating contamination during welding is avoided, but the part handling complexity increases
Solution Approach 1:
The valve-member is pre-oriented and pre-coated with the coating applied to specific regions before assembly. This preliminary preparation establishes the correct orientation and protective coating pattern in advance, eliminating the need for complex manipulation sequences during welding operations.
Solution Approach 2:
The valve-member geometry is segmented into coated and uncoated zones, with welding surfaces deliberately left uncoated. This design allows direct welding access without requiring complex handling or repositioning, simplifying the overall part handling process while maintaining coating protection on critical surfaces.
3Productivity
If rapid orientation is achieved through automated detection, then manufacturing time is reduced, but measurement precision requirements increase
Solution Approach 1:
The coating material is formulated with distinct optical properties that create high-contrast visual boundaries between coated and uncoated regions. This optical differentiation enables automated vision systems to rapidly detect and locate the boundary-line with high precision, facilitating fast automated orientation without compromising measurement accuracy.
Solution Approach 2:
The coating application process creates a boundary-line with specific geometric characteristics (sharp transitions, defined curvature) that optimize detectability. By controlling the coating parameters to produce well-defined boundary features, the system achieves both rapid detection speed and high measurement precision through automated image analysis.
Data Source
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AI summary
An apparatus (40) for orienting a partially coated spherical-object (18) includes a pedestal (42), a camera (48), and a controller (52). The spherical object (10) contains a coating (22) over a portion of a surface (24). The coating (22) defines a spherical-cap (26), and the spherical cap defines a polar-axis (28). The polar-axis (28) is oriented normal to a plane defining a base (34) of the spherical cap (26), wherein an intersection of the plane and the surface (24) defines a boundary line (36). The pedestal (42) retains the spherical object (18) and selectively rotates the spherical object (18) about a longitudinal axis (46) of the pedestal (42). The camera (48) captures an image (50) of the spherical object (18) on the pedestal (42). The controller (52) is in communication with the pedestal (42) and the camera (48). The controller (52) is operable to control the rotation (44) of the pedestal (42), detect the boundary line (36) in the image (50), and determine when the pedestal (42) has positioned the spherical object (18) to cause the boundary line (36) to have a zero curvature (38).