Mold Release Agent Deoxidizing Fe2O3 to Extend Metal Mold Life
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Solution Overview
Problem
The repeated cooling and heating of metal molds during casting cycles induce thermal stress, leading to heat checks and embrittlement, while the hard and coarse reaction products on the mold surface cause surface imperfections and increased releasing forces, shortening the mold's lifespan.
Innovation Solution
A water-soluble mold release agent containing organic acids or their salts, along with ligands, is applied to deoxidize ferric oxide (Fe2O3) on the mold surface to form a finer, more tenacious ferrosoferric oxide (Fe3O4) film, which reduces thermal stress and surface imperfections, and extends mold lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If water-soluble mold release agent is applied on mold surface, then mold surface is cooled and oxide film is formed, but thermal stress increases and heat checks occur
Solution Approach 1:
The invention changes the chemical composition parameters of the mold release agent by incorporating specific metal chelating agents (EDTA, DDTA, HEDTA) and organic acids (acetic acid, formic acid, oxalic acid) to modify the reaction products formed on the mold surface. This chemical parameter change transforms the hard, coarse Fe2O3 into a finer, more tenacious Fe3O4 layer that reduces thermal stress and prevents heat checks while maintaining the cooling effect.
2Ease of operation
If water-soluble mold release agent is applied on mold surface, then mold release function is achieved, but reaction product Fe2O3 is hard and coarse causing surface imperfections
Solution Approach 1:
The invention changes the chemical parameters of the mold release agent by adding metal chelating agents and organic acids that modify the oxidation reaction. This transforms the coarse Fe2O3 reaction product into a finer Fe3O4 layer, improving surface finish while maintaining the mold release function through the emulsified oil base.
Solution Approach 2:
The invention creates a composite chemical system by combining the emulsified oil base with metal chelating agents and organic acids. This composite formulation produces a multi-component reaction layer on the mold surface that combines the release properties of the oil with the surface-modifying properties of the chelating agents and acids, resulting in a fine, tenacious Fe3O4 film.
3Productivity
If repeated casting cycles are performed, then production continues, but mold surface deteriorates and life is shortened
Solution Approach 1:
The invention converts the harmful effect of repeated thermal cycling into a beneficial process. The thermal stress that would normally cause heat checks and deterioration is transformed into a mechanism that promotes the formation of a fine, tenacious Fe3O4 layer through the action of metal chelating agents and organic acids. This layer protects the mold surface from further deterioration, allowing continued production without compromising mold life.
Solution Approach 2:
The invention changes the chemical parameters of the mold release agent to create a protective Fe3O4 layer that evolves with repeated casting cycles. The metal chelating agents and organic acids modify the reaction products formed during each cycle, creating a progressively finer and more tenacious layer that protects the mold surface from thermal stress and mechanical damage, thereby extending mold life while maintaining productivity.
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 formation of a fine Fe3O4 film enhances the mold's resistance to thermal expansion, reduces releasing forces, and inhibits surface imperfections, thereby extending the mold's life and simplifying polishing processes.
Implementation Method 1
the organic acid or organic acid salt which is reducing in the mold release agent is reacted with a component of the mold surface so as to deoxidize Fe2O3 on the mold surface to Fe3O4
Implementation Method 2
most water included in the water-soluble mold release agent is vaporized, whereby the water-soluble mold release agent is promoted to adhere to the mold surface, and the metal mold is cooled
Implementation Method 3
mineral oil, animal oil, vegetable oil, silicon oil, wax, fatty acid or the like is emulsified by a surface active agent and is distributed as the water-soluble mold release agent
Data Source
Figure 1(a)~1(d)
Figure 2
Figure 3
AI summary
An object is to propose a mold release agent improving the state of a mold surface by repeating casting cycle so as to extend the life of the metal mold actively, and a casting method using the mold release agent. A water-soluble mold release agent applied on a mold surface of a metal mold contains organic acid or organic acid salt which is reducing and ligand, wherein concentration of a total thereof is not less than 0.01wt% in using concentration and is not more than a fixed concentration which is stability limit of emulsion of the mold release agent in undiluted concentration. Construction weight ratio of the organic acid or organic acid salt which is reducing and the ligand is in the range from 99/1 to 30/70. The mold release agent is applied on a mold surface of a die casting metal mold, molten metal is injected into the metal mold, and the organic acid or organic acid salt which is reducing in the mold release agent is reacted with a component of the mold surface so as to deoxidize Fe2O3 on the mold surface to Fe3O4.