Classification of injection molds

- Apr 17, 2018-

         There are many forms of injection molds and there are many classification methods. According to their installation methods on the injection machine, they can be divided into mobile (only for vertical injection machine) and fixed injection mold; according to the type of injection machine used can be divided into horizontal or Injection molds for vertical injection machines and injection molds for angle injection machines; single mold cavity and multi-cavity injection molds can be divided according to the number of molding cavity; according to the size of molded products, they can be divided into large, medium and small injections. Mould. According to the overall structural characteristics of the injection mold is divided into the following categories.

1.Single surface injection mold 

            The single part surface injection mold is also called a two (double) plate injection mold. It is the simplest and most commonly used standard injection mold in the injection mold. It forms a part of the cavity on the movable mold, and the other part is fixed. Die. Horizontal or vertical injection molding machine single-point injection molding die, the main channel is located on the side of the fixed mold, the flow channel is set on the parting surface, after opening the product together with the flow channel aggregates stay on the side of the moving mold An ejection device is provided on the movable die for ejecting the product and the flow channel. The die is simple in structure and reliable in operation. In particular, large-scale boxes and shell products are often used.

2. Double sub-surface injection mold             The double parting surface injection mold refers to the pouring system and the products that are taken out from different parting surfaces. It is also called the three-plate injection mold. Compared with the single part surface mold, it adds a movable middle plate (aka gate board). ).             The mold is composed of a fixed flow channel plate, an intermediate plate movable and opened with a flow channel or a cavity, and a movable template provided with an ejector device, a core type and the like. When the mold is opened, the intermediate plate and the fixed template are Move the template separation, the product and the pouring system cold material are taken out from both sides of the middle plate respectively. Therefore, this kind of injection mold has two parallel parting surfaces.

3. Injection mould with movable insert            Due to the special requirements of the products, there are movable thread cores or lateral cores and Huff sliders on the mold. When the mold is opened, these parts cannot be separated from the product simply in the direction of the opening mold. Move the product out of the mold together with the product, and then separate it from the product by hand or with a simple tool. When this moving insert of the mold is loaded into the mold, it should be reliably positioned so as not to cause an accident that the product is scrapped or the mold is damaged.

4. Lateral split core injection mold

           When the product has a side hole or undercut, in the automatic operation of the mold is provided with inclined guide column or slanting slider and other lateral core pulling mechanism. In the mold opening, the use of open mold force to drive the lateral core for lateral movement to make it Detachment from the product. There are also set on the mold cylinder or cylinder to drive the lateral core for lateral sub-pulling.

5. automatic thread injection mold            When the product with internal threads or external threads is required to be demoulded automatically, a rotatable thread core or ring is provided on the mold. The rotary machine uses a rotary motion or reciprocating motion of the injection machine or a special prime mover (such as a motor) , Hydraulic motors, etc., and transmissions, drive the threaded core or ring \ rotation, so that the product out.6. Fixed ejector on one side             Generally, after the injection mold is opened, the products are all left on the side of the movable mold. Therefore, the ejector is also located on the side of the movable mold. However, due to the special requirements of products or the limitations of the shape, the product is left on the fixed mold (or May remain on the fixed mold), then set the ejection device on the side of the fixed mold.7. No flow channel injection mold              Runnerless injection molds include hot runner or insulative runner injection molds that use a method of keeping the flow path heated or insulated (the outer layer of plastic condensing in the flow path acts as a thermal insulator to the molten plastic at the center of the flow path) to keep the nozzles from pouring to pouring. The plastic between the mouths is in a molten state.