The basic principle of fusible core injection molding is to first cast a fusible core using a low melting point alloy, then put the fusible core into the mold as an insert for injection molding, remove the part containing the core from the cavity after cooling, and then heat the core to melt it to form a hollow product.
When injection molding plastic parts that are structurally difficult to release from the mold, such as automobile oil pipes and intake and exhaust manifolds, and other hollow products with complex shapes, fusible core injection molding can be used.
The process of fusible core injection molding technology is as follows.
Casting the core with low melting point metal → putting it into the mold for injection → taking out the part with the core → heating and melting the core → cleaning the part → product.
At present, the fusible core
injection molding technology only in PA66 has accumulated some experience, preliminary experimental research shows that PA6, PBT, PET, PPO, etc. are also suitable for fusible core injection molding.
The fusible core materials often used are Sn-Bi and Sn-Pb low melting point alloys. Melting cores are generally heated by oil and induction coils.
The advantages of fusible core injection molding are
1, especially suitable for the production of complex shape, hollow, not suitable for mechanical processing of composite products.
2、 Precise internal dimensions and smooth surface of hollow plastic parts, which cannot be achieved by usual methods.
3、 Compared with blow molding and gas-assisted
injection molding, although the equipment for casting fusible cores and melting cores have to be increased, the existing
injection molding machines can be fully utilized, and the freedom of molding is larger.
Notes on melt core injection molding process.
1. The core cannot be melted when the plastic part is injected.
2. The molten metal for the core and the medium used to melt the core will not corrode the plastic.
3、 Under the temperature of the melting core, the part will not be deformed.
Latest blog posts
Custom molds injection molding
Custom molds injection molding is a manufacturing process that involves creating custom molds to produce plastic parts. Injection molding is a popular technique used in various industries such as...
Plastic injection molding companies
Plastic injection molding is a manufacturing process that involves injecting molten plastic into a mold to create a wide range of plastic products. From car parts to medical devices and household items, plastic injection molding is used to create a variet
PET Preform Injection Moulding Machine
PET preform injection molding is a manufacturing process that is used to create PET (polyethylene terephthalate) preforms that can be later blown into bottles, jars, and other containers. This process...
You may like
How to buy the right injection mold? What are the specific factors to look at?
For many people in the choice of injection mold processing factory, price is the priority of most people, some people will also take the price of the injection mold as the criteria for selection...
Surface defects of injection molding products shallow analysis, how to solve in the mold, process?
Visible defects on the surface of injection molded products include dark spots, gloss differences or fogged areas, and surface wrinkling or what is called orange peel. Usually...
Influence of injection temperature and speed on product shrinkage
1. The mold temperature is too low to solve the shrinkage problem,The shrinkage problem of hard plastic parts (surface shrinkage concave and internal shrinkage hole) is caused by the defect...
What is the cause of poor mold release in silicone injection molding process?
Usually after silicone injection molding process, the plastic parts need to be separated from the mold cavity. However, sometimes it is difficult to detach the plastic parts from...