What is insert molding?
Insert molding refers to a molding method in which a mold is filled with a resin prepared by inserting a pre-prepared material insert, and the molten material and the insert are joined together to form an integrated product.
Injection molding on a substrate refers to a method of inserting an injection molded part on a part of a metal plate surface.
Its characteristics are as follows
1. The combination of the moldability and flexibility of the resin and the rigidity, strength and heat resistance of the metal complements the complex and intensive metal-plastic integrated product.
2. In particular, the combination of the insulating properties of the resin and the electrical conductivity of the metal enables the molded article to satisfy the basic functions of the electrical product.
3. The pre-formed combination of multiple inserts makes the post-engineering of the product unit combination more rational.
4. Inlay products are not limited to metal, but also cloth, paper, wire, plastic, glass, wood, wire, electrical parts and so on.
5. For the rigid molded product and the curved elastic molded article on the rubber gasket plate, the integrated product is formed by injection molding on the substrate, thereby eliminating the complicated operation of arranging the sealing ,, making the automated combination of the post process easier.
6. Because of the bonding of the molten material to the metal insert, the metal insert gap can be designed to be narrower than the press-in molding method, and the reliability of the composite product molding is higher. .
7. Selecting the appropriate resin and molding conditions, that is, for products that are easily broken (such as glass, coils, electrical parts, etc.), can also be sealed and fixed by resin.
8. By selecting the appropriate mold construction, the insert can also be completely enclosed in the resin.
9. The combination of the vertical injection molding machine and the manipulator, the inserting device, and the like, the insert molding project can be automated.
10. After the insert is molded, it can be made into a product with a hollow groove after the core hole treatment.
Automatic insert molding system design selection considerations
1. Metal insert molding is prone to uneven molding shrinkage, and the limit test of shape and dimensional accuracy of important parts should be done in advance.
2. The metal insert is easily deformed and displaced during the injection process, and the design of the mold and the design of the mold shape for easily maintaining the metal insert should be fully considered. For products whose insert shape cannot be changed, prior testing is indispensable.
3. Where the arrangement of the metal inserts is separated and the conveyor is used, the contact between the metal inserts and the inserts and the vibrating balls may cause slight damage to the surface of the insert, which may affect the quality of the product. The quality tolerance limits should be confirmed in advance.
4. The zigzag shape, the amount of warpage, the difference in material thickness, the difference in diameter, and the difference in thickness caused by gold plating processing of the metal insert due to the press working should be measured in advance. On this basis, the design and design of the automation device and the design of the mold structure are carried out.
5. Mold gate position mode, molding cycle, etc., can predict the predictability of the mold structure, and solve the problem as much as possible in advance or have corresponding improvement measures.
6. It should be confirmed whether the metal insert needs to be preheated or dried. The purpose is to ensure product quality and stability of the molding.
7. The various testing devices installed in the mold are used to ensure the stability of the molding action under the influence of environmental conditions such as heat, force and vibration of the mold. It should be confirmed whether it is used or not.
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