What are the structural components of injection molds?

1. Molding parts

Parts that give the molding material shape, structure, and size, usually composed of cores (convex molds), concave mold cavities, threaded cores, inserts, etc.

2. Casting system

It is a channel that guides the molten plastic from the injection machine nozzle to the closed mold cavity, usually composed of main channels, branch channels, gates, and cold wells.

3. Guide components

In order to ensure that the movable mold and the fixed mold can be accurately aligned when closed, the guide components are set to play a guiding and positioning role. It is composed of guide pins and guide sleeves. Some molds also have guide components on the ejector plate to ensure that the demolding mechanism moves smoothly and reliably.

4. Demolding mechanism

The device that realizes the demolding of plastic parts and casting systems has many structural forms. The most commonly used demolding mechanisms include ejector pins, ejector tubes, ejector plates, and pneumatic ejectors. They are generally composed of ejector pins, reset pins, slingshots, ejector fixing plates, ejector plates (elevator rings), and ejector plate guide pins/guide sleeves.

5. Core pulling mechanism
For plastic parts with side holes or side concave, side core pulling or slide separation (side parting) must be performed before demolding to successfully demold.

6. Mold temperature control system

In order to meet the mold temperature requirements of the injection molding process, a mold temperature control system (such as cooling water, hot water, hot oil and electric heating system, etc.) is required to adjust the mold temperature.

7. Exhaust system

In order to smoothly discharge the gas in the mold cavity, exhaust grooves are often opened at the mold parting surface. The gaps between the push rods or other moving parts (such as slides) of many molds can also play a role in exhaust.

8. Other structural parts

Parts set to meet the requirements of the mold structure (such as fixed plates, movable/fixed templates, support heads, support plates and connecting screws, etc.).