CV Joint Boot Fixing Band With Self-Repairing Alloy Plating
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Solution Overview
Problem
Fastening bands for constant velocity universal joints face issues with corrosion resistance due to peeling of plating or coating at cut ends and engagement contact points, leading to unsatisfactory sealing and increased costs.
Innovation Solution
A fastening band with a zinc-aluminum-magnesium alloy plating layer that self-repairs by forming a dense protective film, covering exposed peeling parts and providing enhanced corrosion resistance, combined with a steel plate of specific mechanical properties (tensile strength ≥270 MPa and elongation at fracture ≥30%) to ensure stable fastening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plated steel plate is used for the fastening band, then strength and corrosion resistance are improved, but plating peels during cutting or pressing causing exposed cut end surfaces to corrode
Solution Approach 1:
The patent applies preliminary anti-corrosion treatment by forming a protective film on the steel plate surface before cutting or pressing operations. This preventive measure ensures that even if plating peels during subsequent manufacturing steps, the exposed surfaces remain protected against corrosion, thus resolving the contradiction between maintaining plating integrity during manufacturing and ensuring corrosion resistance.
2Reliability
If plating or coating is applied to the fastening band, then corrosion resistance is improved, but cost increases due to additional plating treatment or coating treatment
Solution Approach 1:
The patent changes the material parameters by selecting a steel plate with specific composition (carbon content 0.15-0.35%, silicon content 0.01-0.05%) and surface properties that inherently provide corrosion resistance. This parameter optimization allows achieving adequate corrosion protection without requiring additional expensive plating or coating treatments, thus resolving the contradiction between corrosion resistance and manufacturing cost.
3Reliability
If the fastening band is made from metal with good corrosion resistance, then reliability is improved, but cost is increased
Solution Approach 1:
The patent employs a composite approach by combining a carefully selected steel base material with a controlled protective surface layer. The steel plate has optimized composition (including carbon, silicon, and controlled impurities) that provides inherent corrosion resistance, eliminating the need for expensive stainless steel or additional protective coatings, thus resolving the contradiction between reliability and cost.
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 solution provides excellent rust preventiveness and corrosion resistance while maintaining a stable fastening force, reducing costs by preventing plating peeling and oxidation at cut ends and engagement contact points.
Implementation Method 1
the plating layer has the self-repairing function and can cover the plating peeling part with the protective film formed of the component dissolved from the plating layer
Implementation Method 2
a dense zinc-based protective film containing aluminum-magnesium is formed as a protective film
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
Provided is a fastening band including a steel plate (111) plated with a plating layer (110) as a base material. The plating layer (110) has a self-repairing function of forming a protective film (112) on a plating peeling part with a component dissolved from the plating layer. The steel plate plated with a zinc-aluminum-magnesium alloy is used as the base material. The plating layer contains 4.0 mass% to 14.0 mass% of aluminum, 1.0 mass% to 10.0 mass% of magnesium, and the balance of zinc. The plating layer contains aluminum and magnesium in a total content of 15 mass% or less and zinc in a content of 85 mass% or more.