First, the definition of mold
1: The mold used in plastic injection molding becomes the injection molding mold, referred to as the injection mold. The injection mold can form plastic products with complex shapes and high dimensional accuracy or with pliers at one time.
2: “Seven-point mold, three-point process”, for injection molding, the mold has the same great influence on the molded product as the injection molding machine. It can even be said that the mold plays a greater role than the injection molding.
3: It is difficult to obtain an excellent molded product if the mold is not fully understood during injection molding.
Second, the classification of molds
There are many classification methods of injection molds. According to the type of injection molding machine used, it can be divided into injection molds for horizontal injection molding machines, injection molds for vertical injection molding machines, injection molds for angle injection molding machines, and two-color injection molds.
According to the number of cavities of the mold, it can be divided into single-sided and multi-sided injection molds: according to the number of facets, it can be divided into single-parting surface and double-parting surface or multi-parting surface injection molds, according to the form of the gating system can be divided into ordinary casting Injection molds for systems and hot runner gating systems: there are also overlapping molds (stack molds)
According to the basic structure classification, it can generally be divided into the following two categories
1: Two-plate mold (two templates, one parting mold.)
2: Three-plate template (three templates, two parting molds.)
This is divided into two or three templates to classify when the mold is divided, and almost all molds belong to these two types (individual four-plate molds)
Injection molds are often divided into: general injection molds, two-color injection molds, hot runner molds, overmolding molds, etc.
Two-plate mold (characteristics of one-time parting mold): Generally, the fixed template and the moving template are separated at the parting surface.
1: After molding, the molded product and the sprue are cut off and processed (such as: side gate, sprue)
2: The structure is simple and easy to use.
3: Suitable for automatic drop of products. (latent gate, no post-processing required)
4: Less failure and cheaper price.
Features of three-plate mold (secondary parting mold):
1: There is a template between the fixed template and the moving template, and there is a nozzle flow channel between this template and the fixed template.
2: Since a point nozzle can be used, post-processing of the nozzle position is not required.
3: The structure is complex, and it is necessary to divide the molded product and the nozzle flow channel.
4: There are more failures than the two-plate mold, and the mold cost is also higher.
Post time: Mar-04-2022