Reactive Lubricant for Cold Forming Substrates
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Solution Overview
Problem
The cold forming industry faces inefficiencies due to the need for multiple treatment steps in pretreating metallic substrates, including separate conversion and lubrication processes, which can lead to VOC pollution, occupational hazards, and the risk of tool-workpiece welding during forming operations.
Innovation Solution
A water-based, acidic reactive lubricant is developed that combines conversion treatment and lubrication into a single step, using oxalic acid, nitroguanidine, and film formers like polyvinylpyrrolidone, with emulsified lubricating oils, to create a chemically and physically bound layer that adheres strongly to the substrate, reducing friction and preventing tool-workpiece welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple separate treatment steps (cleaning, pickling, activation, conversion treatment, rinsing/neutralization, lubrication) are used for pretreating metallic substrates, then the substrate surface quality and lubrication effectiveness are improved, but the process complexity and treatment time increase
Solution Approach 1:
The patent combines conversion treatment and lubrication into a single integrated step by using a lubricant composition that contains both lubricating agents and conversion coating agents. This allows the substrate to receive both treatments simultaneously, eliminating the need for separate conversion treatment and lubrication steps, thereby reducing process complexity while maintaining surface quality and lubrication effectiveness
Solution Approach 2:
The lubricant composition is designed to perform multiple functions: it provides lubrication for cold forming, induces conversion coating formation on the substrate surface, and eliminates the need for separate neutralization and rinsing steps. This multi-functional approach reduces the number of treatment steps while ensuring reliable substrate preparation
2Reliability
If multiple separate treatment steps including rinsing and neutralization are used, then the substrate is properly prepared and bath life is extended, but the treatment time and production cycle increase
Solution Approach 1:
The patent merges conversion treatment and lubrication into one step, and the lubricant composition is formulated to be self-neutralizing, eliminating the need for separate rinsing and neutralization steps. This integration significantly reduces treatment time while maintaining proper substrate preparation quality
Solution Approach 2:
The lubricant composition allows continuous processing by eliminating idle rinsing and neutralization steps. The substrate proceeds directly from conversion treatment to lubrication in a continuous operation, maximizing productive time and reducing overall treatment cycle time
3Reliability
If conventional lubricant compositions are used in separate lubrication step, then lubrication effectiveness is achieved, but VOC pollution and occupational hazards increase
Solution Approach 1:
The patent changes the chemical composition parameters of the lubricant by incorporating conversion coating agents that form a protective layer on the substrate. This chemical modification reduces VOC emissions and eliminates the need for separate neutralization steps, thereby reducing harmful factors while maintaining lubrication effectiveness
Solution Approach 2:
The patent converts potentially harmful acidic conversion treatment into a beneficial process by using a self-neutralizing lubricant composition. The conversion coating agents in the lubricant transform the acidic surface into a protected, lubricated surface, eliminating the need for harmful neutralization chemicals and reducing VOC pollution
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 combined layer effectively reduces friction and prevents tool-workpiece welding, allowing for efficient cold forming with fewer treatment steps, minimizing VOC emissions, and ensuring safety by being non-combustible, while maintaining a stable and adherent film throughout the forming process.
Implementation Method 1
a water-based, acidic reactive lubricant comprising a) oxalic acid, b) at least one accelerator which comprises nitroguanidine and/or at least one iron(III) source
Implementation Method 2
at least one accelerator which comprises nitroguanidine and/or at least one iron(III) source
Implementation Method 3
c) at least one film former, at least one wax and/or at least one emulsified lubricating oil
Implementation Method 4
The combined layer effectively reduces friction and prevents tool-workpiece welding
Data Source
AI summary
The present invention relates to a simplified process for the pretreatment of metallic substrates for cold forming, wherein a metallic substrate is successively 1) preferably cleaned and subsequently rinsed, 2) preferably pickled and subsequently rinsed, 3) brought into contact with a water-based, acidic, reactive lubricant comprising a) oxalic acid, b) at least one accelerator which comprises nitroguanidine and/or at least one iron(III) source and c) at least one film former, at least one wax and/or at least one emulsified lubricating oil and 4) is optionally dried, where the at least one film former is selected from the group consisting of homopolymers and copolymers of ethylene, propylene, styrene, (meth)acrylic acid, (meth)acrylate, vinylamine, vinylformamide, vinylpyrrolidone, vinylcaprolactam, vinyl acetate, vinylimidazole and/or epoxide and salts thereof and polyurethanes, polyamides, polyethylenimines, polyamines and salts thereof, where the at least one wax is selected from the group consisting of nonionic waxes and cationically stabilized waxes, and where the at least one emulsified lubricating oil is selected from the group consisting of synthetic oils, mineral oils, vegetable oils and animal oils, to a corresponding reactive lubricant and to a metallic substrate which has been pretreated by the process and the use thereof.