As a key tool in industrial production, the function of each component in a mold is crucial to the molding quality of the product. The following is a detailed analysis of the functions of each mold component:
Molding System
The molding system is the core of the mold, including the cavity, core, and inserts. The cavity is responsible for molding the outer surface of the product, such as the outer wall of a plastic shell. Its precision requirements are extremely high to ensure the product's appearance quality. The core molds the inner surface of the product, such as the inner hole of a preform mold. Some cores also need to integrate venting channels to prevent gas retention and product defects. Inserts are used for complex local structures, such as threads and lettering, and can be replaced individually to reduce maintenance costs.
Gating System
The gating system guides the flow of material and includes the main runner, branch runners, gate, and cold slug well. The main runner connects the injection molding machine nozzle to the branch runners; its diameter design needs to be reasonable to reduce pressure loss. The branch runners distribute the molten material to multiple cavities, and their cross-sectional shape is mostly trapezoidal or circular. The gate controls the flow rate and direction of the molten material entering the cavity, and there are various types, such as point gates and side gates. The cold slug well collects cold slug from the front end to prevent clogging of the gate.
Temperature Control System The temperature control system manages the mold temperature and includes cooling channels, heating elements, and a temperature controller. Cooling channels remove heat through circulating cooling water, shortening the molding cycle; conformal channel design further improves cooling efficiency. Heating elements are used in hot runner molds or die-casting molds requiring preheating to ensure uniform mold temperature. The temperature controller precisely controls the temperature of each zone, preventing warping or shrinkage marks caused by uneven temperature distribution.
Demolding System The demolding system releases the product and includes ejector pins, ejector plates, pneumatic demolding, and angled ejector mechanisms. Ejector pins directly push the bottom of the product, and the ejector plate secures the ejector pins and transmits the injection molding machine's ejection force. Pneumatic demolding uses compressed air to blow the product off, suitable for thin-walled or easily deformable parts. The angled ejector mechanism solves the demolding problem for undercut structures, ensuring smooth product demolding.
Guiding System The guiding system ensures precise alignment during mold opening and closing, including guide pillars, guide sleeves, and precision positioning blocks. Guide pillars and guide sleeves work together with clearance controlled within a reasonable range to ensure precise alignment of the moving and fixed molds. Precision positioning blocks are used for secondary positioning of large molds, improving assembly accuracy.
Side Core Pulling System The side core pulling system handles complex structures and includes a slider, angled guide pillars, and locking blocks. The slider moves laterally along the guide rail to achieve lateral core pulling. The angled guide pillars drive the slider's movement, and their tilt angle needs precise control. Locking blocks prevent the slider from retracting during injection, ensuring dimensional stability of the molded part.
Structural Support System The structural support system provides stable support for the mold, including a moving mold base plate, a fixed mold base plate, support pillars, and mold feet. The moving mold base plate fixes the moving mold portion and bears the injection molding machine's clamping force. The fixed mold base plate fixes the fixed mold portion and is precisely aligned with the injection molding machine nozzle. Support pillars enhance the rigidity of the moving mold base plate, while mold feet lift the moving mold portion to install the ejection system.
