In the structural design of the injection mold, Shanghai Mulan Injection Mold Processing Factory said that in addition to various mechanisms, the injection mold also has some other components.
(1) Inserts: Inserts are assembled in the cavity or core of the movable or fixed model, and are used to form some special models and removable cores on the product parts. The use of inserts is not only convenient for maintenance, but also convenient for the processing of dynamic and fixed model cavities or profiles.
The main part of the box lock, the assembly of the core insert in the injection mold, the core insert is installed in the fixed template and anti-rotation with cylindrical pins, and the step at the lower end can limit the axial movement of the core insert. Therefore, the core insert can form the spline hole K of the main part of the box lock, and can complete the core pulling and reset actions with the opening and closing of the movable and fixed molds.
①The role of inserts
a. Some special holes and grooves used to form product parts;
b. Assembled in the movable mold or fixed mold cavity, the core can be removed and replaced;
c. After being assembled with the movable or fixed mold core, the mold opening and closing movement can be performed simultaneously with the movable or fixed mold core.
②The difference between the insert and the core-pulling mechanism
a. The molding and core-pulling movement of the insert is directly derived from the opening and closing movement of the moving and fixed molds. The horizontal and oblique core-pulling movement of the core is converted into the core-pulling movement of the slider by the bent pin or the inclined guide post through the opening and closing movement of the moving and fixed molds, or it is derived from the hydraulic and pneumatic pumping movement. Core movement; the vertical core-pulling movement of the core is converted into the movement of the rack and gear after the opening and closing movement of the moving and fixed molds, and then realized as a vertical core-pulling movement.
b. The shape of the insert molding is a hole and a groove that can only be opened and closed in the same direction as the movable and fixed molds. The core-pulling mechanism of the core is the opening and closing direction of the dynamic and fixed molds of the molding and injection molded parts, and the mold holes and grooves in the horizontal, vertical and oblique directions; The opening and closing direction of the fixed mold is the same square hole and groove, and it is the hole and groove that the insert cannot form.
(2) Loose block: The loose block can form the holes and grooves in all directions of the product parts, and after being demolded together with the formed product parts, the core is manually removed from the formed product parts. The loose block can be positioned and fixed in the injection mold.
①The role of live blocks
a. The holes and grooves in all directions of the product parts can be formed, which can reduce the core-pulling mechanism of the injection mold and simplify the structure of the injection mold.
b. It can avoid the movement interference between the hole of the molded product part and the core of the groove. When the cores of the molded product parts’ holes and grooves interfere with movement, setting one of the cores as a loose block can effectively avoid the movement interference of the cores.
c. Due to the need to arrange additional manual loading and unloading of live blocks, the production efficiency is reduced.
②The difference between the movable block and the insert and the core of the core-pulling mechanism: the movable block is installed in the cavity of the movable and fixed mold, and is demolded together with the product parts, and then the core is manually taken out of the formed product parts. It is impossible for inserts and core-pulling mechanism cores to be demolded together with product parts.
The axial displacement of the loose block is limited by the cylindrical pin; after the mold is closed, the inner shape of the overflow pipe is formed by the loose block; Together with the loose block, it is ejected out of the injection mold; and then the loose block is manually removed from the overflow pipe.
(3) Insert support: Insert refers to the metal part contained in the plastic part material. Since the material of injection molded parts is softer than that of metal parts, and injection molded parts are often connected with other parts, in most cases when injection molding is used, the insert is contained in the injection molded part. The part used to support the insert during molding is the support.
Parts of the outer handle with screws as inserts. The screws are wrapped in the outer handle part, and only the screw part is exposed. The injection mold part that supports the insert in the injection mold is called the insert support. The circlip and support in the injection mold are the support for the insert. The supporting piece, the supporting piece and the circlip support the screw in the injection mold, and the circlip is provided to prevent the supporting piece from falling off. When the outer handle part is demolded, the supporting part is demoulded along with the screw, and then the supporting part needs to be unscrewed from the screw rod with an electric wrench, and the screw is put into the supporting part and then put into the corresponding hole of the injection mold .
① Function of insert support: Insert support is an injection mold part used to support inserts in injection molds. The insert support can be fixed in the cavity or core of the movable mold or fixed mold like the insert, and it is a removable core; it can also be the same as the loose block, and the parts can be demoulded together and then taken out with tools.
②The difference between the insert support and the insert and the loose block: the support is the injection mold part that supports the insert, and the insert and the loose block are the core of the hole and the groove of a certain part of the molded part.
The structural design of the injection mold, Shanghai Mulan Injection Mold Processing Factory said that in addition to the above-mentioned mechanisms, the injection molded parts also have some other mechanisms and components. molding. The mechanism of the injection mold should be designed according to the structural design and design of the injection mold, and the form of the injection mold mechanism will in turn affect the implementation of the structural design of the injection mold. The selection and design of all injection mold mechanisms can only be correctly determined after repeated analysis and comparison.