News Category


You are here: Home > Knowledge

Pressure casting

Views : 165
Update time : 2021-01-28 14:53:07
Pressure casting
Metal die-casting high temperature release agent technology
(-) The quality requirements of die-casting mold release agent Mold release agent must have excellent lubrication performance at high temperature, low volatility point, thinner can quickly evaporate at 100 ~ 150 temperature, spraying can be even and dense film, Die-casting and mold corrosion-free, stable performance, non-hierarchical, non-breaking milk, non-irritating odor, shelf life of more than six months at room temperature, high temperature decomposition of toxic and harmful gases, to ensure the health of industrial workers.
(B) the role of die-casting release agent Release agent's role is to die-casting alloy and die casting mold to provide effective isolation between the protective layer to avoid metal liquid directly flush cavity and core surface to improve the working conditions of die-casting mold, minus Small die-casting mold heat conduction to protect the flow of molten metal to improve the metal liquid formability, high temperature to provide excellent lubrication performance, in order to easily launch die casting and die casting to improve the surface quality and prevent sticky mold.
(C) die-casting release agent types and methods of use Release agent for the water-based paint, the appearance of milky white thick liquid, PH value of about 7, is a non-toxic green-friendly products, so be assured that the use of . When using the release agent, whether brushing or spraying, the thickness should be uniform, and should not be too thick, after coating should be coated with water to evaporate after the mold-casting, in order to avoid molding difficulties. Use mold release agent should pay attention to the use of models:
(1) For general products, the appearance of the die-castings is not very high due to the fact that there is still gold after blasting, lathe, milling machine, etc., and the last surface is sprayed with paint. We recommend that you choose cheap A-type release agent.

(2) the larger the die-casting parts, the release agent requirements It requires higher temperature resistance, higher isolation, the appearance also need to look better, we recommend that you use the mold release better B-type die-casting Release agent.
(3) For large size, appearance demanding, complex structure of die-casting, we recommend that you choose C-type die-casting mold release agent. BD-257 series with more than 360 degrees high temperature resistance, high quality mold release, and overcome some of the domestic high-grade release agent although stripping better, but in the follow-up processing spray paint or paint the surface from the shell defects , With release agent die-casting surface easy to clean, no flow marks, you can easily paint.
(4) when used, if it is more difficult to mold the product, generally add water for the release agent of 100 times, if it is a small product easy to release the product can add 150 times the maximum water, specific to a product, please the discretion of the user Ratio.
Aluminum die-casting, including aluminum, magnesium, zinc alloy die-casting products, are widely used in automobiles, telecommunications, motorcycles, home appliances and other industries. Aluminum die-casting agent, is the production process must be used additives. Due to the different size of the products, different structural complexity, different post-processing requirements, the requirements of the release agent are also different.
Zinc alloy material heated melting (aluminum melting point of 660.4 degrees Celsius), under high pressure into the mold cavity in the liquid state, and in a short period of time to open the top mold parts. In order to ensure the smooth release of products, injection mold release agent must be sprayed on the surface of the mold cavity before injection.
Aluminum die-casting mold release agent must meet the following requirements:
1, oil. As an effective material for intermetallic isolation, silicone oil is the ideal choice. This silicone oil should have high temperature, does not affect the post-processing properties (such as aluminum products) characteristics.
2, water-based. Due to the high temperature of the mold, any solvent-based mold release agent is not suitable. Water as a dispersion medium, to high temperature environment, the rapid evaporation of water, mold release effect evenly distributed in the cavity surface. Film forming uniform, strong adhesion, high temperature erosion, mold release performance.
3, emulsion. Choose a suitable emulsifier silicone oil, to prevent its carbonization under high temperature. To keep the surface of the product and the cavity clean.
4, the casting, mold equipment are not corrosive. Castings wheel products clear, smooth surface without trace, does not affect the painting.
5, volatile smoke-free, non-toxic, do not pollute the environment, non-destructive operator health.
Die-casting hydraulic oil selection
The use of high quality, cleanliness of the hydraulic oil to ensure long-term operation of machinery, when the hydraulic oil into the tank to go through the 15um or thinner filter to reach the upper limit of the liquid level gauge, because the machine starts running, the hydraulic oil Will be sucked into the piping and hydraulic components, so the oil will be reduced to the appropriate location (between the liquid level limit in the lower limit), if there is a shortage of oil during operation, then add hydraulic oil.
Hydraulic oil not only as a power transmission medium, but also to lubricate the metal surface to reduce friction, and has the role of rust, and hydraulic oil viscosity and pH will affect the valve and seal the vent. In order to select the appropriate hydraulic oil, the company specifically cited the following characteristics of the oil, hydraulic oil as a reference when choosing.
Free-flowing and a certain viscosity;
1. In the mobile parts to form a suitable seal;
2. There should be no physical or chemical changes in use; anti-rust, anti-corrosion;
3. Can properly withstand the load, reducing the wear and tear of moving parts;

4. According to use, resistant to burning;
Not easy to foam
The temperature of the hydraulic oil will have a great influence on the life of the hydraulic oil. It will seriously affect the viscosity of the hydraulic oil, and it will cause the oil leakage and the aging of the oil seal to accelerate. It is therefore recommended that the temperature of the hydraulic fluid be between 15 and 55 ° C.
In the past, mainly in the die-casting machine is the use of mineral-type hydraulic oil, hydraulic oil with high wear resistance, high stability, good sealing performance and other characteristics are widely used, but because of the risk of easy combustion or explosion, increasingly changed in recent years Flame-retardant hydraulic fluid. Water-glycol type hydraulic fluid is one of the currently recommended, and its unique performance in terms of safety, ease of handling and environmental protection has also been valued. However, it is not comparable to mineral-type hydraulic fluids in terms of stability, lubrication quality and tightness, so customers should consult with the die-casting machine manufacturer before using this type of hydraulic fluid.