Multi-Wax Lubricant Coating for Cold Forming Viscosity Control
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Solution Overview
Problem
Existing cold forming processes for metallic surfaces face challenges with high temperature viscosity issues, environmental compatibility, and the need for additional solid lubricants, which affect pressing accuracy and tool cleanliness, particularly in heavy forming operations.
Innovation Solution
A process using an aqueous lubricant composition with a combination of waxes having markedly different properties and water-soluble oxides or silicates, which forms a coating with multiple softening ranges, allowing for continuous thermal and mechanical property changes during cold forming, reducing the need for additional solid lubricants and enhancing tool cleanliness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-wax lubricant composition is used, then the formulation is simple, but the coating cannot maintain stable viscosity across the wide temperature range encountered during cold forming
Solution Approach 1:
The lubricant composition is segmented into multiple wax components, each with distinct melting ranges. This segmentation allows the coating to progress through multiple softening stages as temperature increases, maintaining stable viscosity across the wide temperature range encountered during cold forming operations.
Solution Approach 2:
The invention uses a composite wax system combining different wax types (natural waxes, synthetic waxes, and their derivatives) with complementary melting characteristics. This composite approach creates a synergistic effect where the combined melting ranges provide continuous viscosity stabilization throughout the forming process.
2Force
If additional solid lubricants are applied to enable heavy forming operations, then the lubrication capability is improved, but the device complexity and number of coating steps increase
Solution Approach 1:
The invention merges the functions of multiple lubricants into a single integrated coating composition. The multi-wax system combines the benefits of different wax types and includes solid lubricant particles within the same aqueous dispersion, eliminating the need for separate application steps while maintaining heavy-forming capability.
Solution Approach 2:
The single lubricant composition performs multiple functions simultaneously: it provides base lubrication through the aqueous phase, temperature-dependent viscosity control through multiple waxes, and enhanced extreme-pressure lubrication through embedded solid lubricant particles. This multi-functionality replaces what would otherwise require multiple separate coatings.
3Temperature
If sulfide-containing solid lubricants are used, then the lubrication at high temperature is improved, but environmental compatibility and tool cleanliness deteriorate
Solution Approach 1:
The invention extracts the harmful sulfide components from the lubricant system while retaining the beneficial high-temperature lubrication properties. By using alternative solid lubricants such as graphite, molybdenum disulfide-free compounds, or ceramic particles, the composition maintains effectiveness at elevated temperatures without the environmental and cleanliness issues associated with sulfides.
Solution Approach 2:
The aqueous-based lubricant composition is designed to be easily removable after forming operations. The water-soluble nature of the base composition allows for simple rinsing and removal from tools and workpieces, replacing persistent sulfide-based lubricants that require complex removal procedures and pose environmental hazards.
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 approach simplifies and improves cold forming by enabling heavier operations with higher forces and temperatures, reducing tool wear and the need for additional lubricants, while maintaining environmental compatibility and facilitating easy removal of residues.
Implementation Method 1
a lubricant composition in the form of an aqueous solution or dispersion based on polymeric organic material with a content of at least one organic polymeric material of ionomer, other polymer/copolymer and/or derivatives thereof as well as, optionally, of at least one wax
Implementation Method 2
the coating formed from the lubricant composition has several consecutive softening ranges/softening points and/or melting ranges/melting points over a relatively large temperature range
Data Source
AI summary
The invention relates to a method for preparing metal workpieces for cold forming by applying a lubricant layer either to a metal surface or to a metal surface which has been pre-coated with e.g., a conversion coating. The lubricant layer is formed by contacting the surface with an aqueous lubricant composition which has a content in at least two waxes having distinct properties and a content in organic polymer material, the organic polymer material used predominantly being monomers, oligomers, co-oligomers, polymers and copolymers based on ionomer, acrylic acid/methacrylic acid, epoxide, ethylene, propylene, styrene, urethane, the ester or salt thereof. The invention to the corresponding lubricant composition, to the lubricant layer produced thereof and to its use.