Oil Tempered Wire Lubricant Coating for Spring Winding
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Solution Overview
Problem
Oil tempered wires experience variations in spring shape during the winding process due to high friction coefficients between the winding tool and the wire, leading to non-uniform coiling speeds and shape inconsistencies, especially as the strength of the steel wires increases.
Innovation Solution
An oil tempered wire with a lubricant coating comprising a lubricant component resin (such as polyacetals, polyimides, melamine resins, acrylic resins, or fluororesins) and a binder resin, applied in a specific mass range and surface roughness to enhance lubrication and adhesion, reducing friction and ensuring stable winding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the strength of steel wires is increased, then the mechanical properties are improved, but the friction coefficient between the winding tool and the wire increases leading to variations in spring shape
Solution Approach 1:
A lubricant coating is applied as an intermediary layer between the steel wire and the winding tool. This coating reduces the friction coefficient during the winding process, preventing excessive slippage and ensuring uniform coiling speed, thereby maintaining spring shape consistency even when using high-strength steel wires
Solution Approach 2:
The friction coefficient is modified by changing the surface properties of the steel wire through lubricant coating. By controlling the lubricant composition and surface characteristics, the friction parameter is optimized to prevent slippage while maintaining the high strength properties of the wire
2Ease of operation
If a lubricant coating is applied to reduce friction, then coilability is improved, but excessive slippage may occur if the lubrication is too effective
Solution Approach 1:
The lubrication parameters are precisely controlled by selecting specific lubricant components (polyacetals, polyimides, melamine resins, acrylic resins, or fluororesins) and controlling the deposited mass within the range of 1.0-4.0 g/m2. This optimization ensures sufficient lubrication for smooth winding while preventing excessive slippage that would cause coiling uniformity issues
Solution Approach 2:
The lubricant coating is formulated as a composite material system comprising multiple resin components with different tribological properties. This composite approach allows tuning of the friction characteristics to achieve the optimal balance between reducing friction for ease of winding and maintaining enough grip to prevent excessive slippage
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 lubricant coating improves coilability by reducing friction and preventing excessive slippage, resulting in consistent spring shapes with reduced variations, while being thermally decomposable to avoid adverse effects during heat treatments.
Implementation Method 1
the lubricant coating includes a lubricant component resin and a binder resin... the lubricant component resin is at least one selected from polyacetals, polyimides, melamine resins, acrylic resins and fluororesins
Data Source
AI summary
An oil tempered wire includes a steel wire and a lubricant coating disposed around an outer circumference of the steel wire, wherein the lubricant coating includes a lubricant component resin and a binder resin, the lubricant component resin is at least one selected from polyacetals, polyimides, melamine resins, acrylic resins and fluororesins, the deposited mass of the lubricant coating is not less than 1.0 g/m2 and not more than 4.0 g/m2, and the surface roughness Rz of the steel wire is not more than 8.0 μm.