The relationship between the selection of release agent and the quality of die-casting

Release agents are designed specifically for special molding. It is the production of metal die-casting parts and casting additives. Its main function is to help remove metal die-casting products from the mold and maintain the integrity and post-processing capabilities of the product.

The main function of release agent is to form a uniform release film on the surface of the mold, allowing the molded product to be released. The second function is to consider the quality and style of the formed part surface, the scale on the mold, the feasibility of cleaning, and the feasibility of coating. Other factors to consider include product shelf life, product stability, user (and manufacturer) health or safety issues, and corrosion issues. The basic components of release agents include different types of wax, resin, grease, and silicone oil. The release agent for metal die-casting products is mainly an external release agent.

Due to the different composition and content of water-based release agents, the active ingredients at the initial temperature begin to adhere to the surface of the mold, that is, the viscosity temperature is different, which means that the initial temperature for effective film formation is different. Practice has shown that the type, concentration, crystallizer temperature, spraying method, and dosage of release agent directly affect the quality of die castings.

On the basis of summarizing the experience of some professional slow-release agent manufacturers in using water-based slow-release agents, the appropriate methods for selecting and using slow-release agents are:

1. Explore the best dilution ratio and spray amount.

2. To protect the mold, high-quality release agent should be used and a small amount of release agent should be sprayed.

3. In order to reduce the amount of residue deposited on the mold, products that do not contain excessive paraffin wax are not necessary.

4. Different types of release agents should be selected based on casting size, wall thickness, complexity, and process.

5. Attention should be paid to the process of blowing off chips to ensure that any residual release agent is completely removed each time.

6. Mold temperature control: It is recommended to open the mold at 300~450 ℃; Take 280~430 ℃; Start spray releaser at 200~280 ℃; Film formation at 180~350 ℃; Blow air flow rate of 150~300 ℃.