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(一) Mould releasing agent’s requirements in quality. Mould release agent must have excellent lubricating functions at high temperature and with low volatilization point, which can be quickly volatilized at the 100~150 temperature, in order to uniform and compact film coating, causing no corrosive effect on casting mould, it was required stable performance and do not divided with layer, no emulsion breaking, no stimulation smell, the quality guarantee period is more than half a year in room temperature, when decomposing with no toxic and harmful gases at high temperature, which make sure the health of workers.
(二) Mould releasing agent’s effect.? The effect of mould releasing agent is to provide a covering layer between casting parts and mould effectively, avoiding the liquid metal directly flushing the cavity and core surface, improve the casting working conditions, reduce the casting mould heat conduction protection of metal liquid flow, improve the formability of liquid metal provides excellent lubrication performance, high temperature, so as to easily introduced casting and improve the surface quality of casting, to prevent sprue sticking.
(三) Types and using method of mould releasing agent. for water-based coating, appearance is milk white viscous liquid, pH value is about 7, is a non-toxic green environmental protection type products, please rest assured to use it. Use of release agent, whether brushing or spraying, the thickness should be uniform, and shoulds not be too thick, should be coated after water volatilizing coatings after to casting, avoid the molding difficult. The selection of mold release agent should pay attention to the use of models:
(1) For regular products, because there are after sand blasting, lathe, machine- milling and other metal processing in the appearance, the final surface and spray paint, so the requirement for casting appearance is not very high. We recommend that you use a cheap A type release agent.
(2) For bigger casting parts, the release agent requirements which need higher resistance to high temperature, high isolation, appearance also need more good-looking, B type of mould releasing agent agent we recommend that you use for better effect.
(3) For even bigger ones which appearances are more demanding, casting parts with more complex structure, we recommend that you use the C type of mould releasing agent. BD-257 series of 360 degrees above the resistance to high temperature, release of high quality, and to overcome some of domestic high-grade mold release agent while demoulding effect is good, but in the subsequent processing spray don't paint or paint surface crust faults, easy cleaning mold release agent for castingsurface, no flow marks, you can easily paint.
(4) when using it, if it is more difficult to release products, the general water is 100 times of release agent, if it is a small product is easy to release products can be a maximum of 150 times of water, to a specific product please as appropriate proportion. As aluminum alloys, including aluminum, magnesium, zinc alloy casting products series, widely used in automobiles, telecommunications, motorcycle, household appliances industry. Aluminum alloy die-casting mold release agent, must be used in the manufacturing process of the auxiliary. Due to the volume of different size products, structural complexity, the different products after processing requirements are different, the release agent requirements also each are not identical.
Zinc alloy melting (aluminum melting point of 660.4 DEG C), in liquid into the mold cavity by high pressure, and die in a short time the top pieces die. In order to ensure the product smooth demoulding, must be in before injection in the mold cavity surface spraying release agent. Aluminum alloy die-casting mold release agent must meet the following requirements:
1, Oil. As an effective material for isolation of metal, organic silicone oil is ideal choice. The silicone oil must have high temperature resistance and processing performance was not affected after (such as aluminum coating products) characteristics.
2, Water. Because the mold in the condition of high temperature, the release agent of any solvent is appropriate. With water as the dispersion medium, to a high temperature environment, the rapid evaporation of moisture, effectively releasing evenly distributed on the surface of the mold cavity. Uniform film, strong adhesion, high temperature resistance to erosion, release performance.
3, The emulsion. Selection of suitable emulsifier emulsified silicone oil, to prevent the high temperature carbonization. In order to maintain the product and mold cavity surface cleaning.
4, No corrosion on the casting parts and mold equipment. Casting product contour clear, smooth surface without scar, do not affect the coating.
5, The volatilization is smoke-free, non-toxic, no pollution to the environment and no harmful effect on operation personnel health.