Locator Pin Coating for Welding Spatter Resistance
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Solution Overview
Problem
Locator pins used in manufacturing processes lack adequate wear resistance, corrosion resistance, and electrical insulation, leading to frequent replacements and operational inefficiencies, especially in welding applications where they are exposed to friction and chemical interactions.
Innovation Solution
A method involving Plasma Electrolytic Oxidation (PEO) to deposit a ceramic coating on metallic pins, providing a wear-resistant, corrosion-resistant, and electrically insulating layer, and an alternative method using a thermal diffusion process for vanadium carbide and diamond-like carbon composite coatings to enhance wear and corrosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uncoated metallic pins are used, then dimensional stability is maintained, but wear resistance and corrosion resistance are inadequate
Solution Approach 1:
The patent applies composite materials by combining a metallic core (providing dimensional stability) with a ceramic coating layer (providing wear and corrosion resistance). This composite structure allows the pin to simultaneously achieve the dimensional stability of metal and the protective properties of ceramic materials, resolving the contradiction between maintaining core stability and improving surface durability.
Solution Approach 2:
The ceramic coating is applied selectively to specific areas of the metallic pin where wear and corrosion resistance are most needed, such as the surface and edges that contact workpieces. This local application maintains the overall dimensional stability of the metallic core while providing enhanced protection only where required, optimizing both properties.
2Productivity
If repetitive insertion and removal is performed, then alignment function is maintained, but wear resistance is required to prevent frequent replacement
Solution Approach 1:
The ceramic-coated metallic composite structure provides exceptional wear resistance that enables the pins to withstand thousands of repetitive insertion and removal operations. The hard ceramic surface resists friction and mechanical wear, significantly extending the operational lifespan of the pins and reducing replacement frequency, thereby maintaining high productivity over extended periods.
3Ease of operation
If weld spatter adhesion is prevented, then pin removal and insertion becomes easier, but surface properties must be modified
Solution Approach 1:
The ceramic coating creates a non-stick surface that prevents weld spatter from adhering to the pin surface. This smooth, chemically inert ceramic layer acts as a barrier between the metallic pin and the weld spatter, allowing pins to be easily removed and inserted without material buildup, while maintaining complete surface integrity and protecting the underlying metal from contamination.
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
The PEO process results in a dense, hard ceramic coating with improved wear resistance and corrosion protection, while the vanadium carbide and DLC composite coating offers superior wear resistance and electrical insulation, significantly extending the life of locator pins and reducing operational downtime.
Implementation Method 1
The method includes depositing a layer of a coating using plasma electrolytic oxidation upon and in contact with selected areas of the metallic core of a locator pin
Implementation Method 2
an alternative method using a thermal diffusion process for vanadium carbide and diamond-like carbon composite coatings to enhance wear and corrosion resistance
Data Source
AI summary
A method of producing a locator pin with wear-resistant, corrosion resistant, and electrically insulating coating on selected areas of the surface off a metallic core include depositing a coating on the selected areas. The locator pin may have a single layer of a ceramic coating deposited using plasma electrolytic oxidation or may have a composite coating that includes a layer of vanadium carbide on selected areas of a surface of a locator pin and a layer diamond-like carbon on top of and in contact with the vanadium carbide layer. The vanadium carbide coating may be deposited using a thermal diffusion process and the diamond-like carbon coating may be deposited using a plasma-enhanced chemical vapor deposition process. The coating prevents weld splatter from adhering to the coated areas, and prevents the locator pin from acting as a shorting path during welding of parts located by the locator pin.