Overview of Injection Mold Components
Main Parts of an Injection Mold:
Cavity Side A (Stationary): This side defines the external shape of the part, holds cooling channels and the runner system, and is stationary during the molding process.
Cavity Side B (Moving): This part moves during the molding process, typically including an ejector system to help open and close the mold.
Key Components by Function:
Runner System
Transfers molten plastic from the nozzle to the mold cavity.?
Sprue Bushing: A conical or cylindrical channel that directs molten plastic from the nozzle to the runner.
Runner Network: Distributes material from the sprue to multiple cavities.
Gate: A small opening where material enters the mold cavity; types include edge, pin, or fan gates.
Cooling System
Reduces the temperature of the mold to solidify the part.?
Baffles: Redirect coolant into sub-channels for even distribution.
Bubblers: Hollow tubes that connect coolant channels within drilled holes.
Thermal Pins: Fluid-filled cylinders that absorb and dissipate heat.
External Pump: Provides the necessary pressure and flow rate for the cooling system.
Molding Components
Responsible for shaping the part's geometry, dimensions, and precision.
Mold Cavity: The stationary part of the mold that defines the part's exterior.
Core: Forms the internal features of the part, interacting with the cavity to create the shape.
Molding Rod: A core pin that creates narrow features, such as shafts or holes.
Lifters: Help maintain proper draft angles during mold opening and closing.?
Venting System
Releases trapped air and gases during molding to prevent defects like bubbles, voids, or incomplete filling.
Grooves and Channels: Narrow channels are placed along the parting line to help vent air.
Venting Valves: Micro-valves are installed inside and outside the mold to aid in air evacuation.
Guiding System
Ensures proper alignment of the mold halves during opening and closing.?
Guide Pins and Bushings: Guide pins are cylindrical extensions on one half of the mold that interlock with bushings on the other half to maintain alignment.
Ejector System: Facilitates the smooth removal of parts from the mold after cooling.
Ejector Pins: Thin cylindrical pins are used to push the molded part out of the mold without damage.
Components by Structure
Mold Base: The foundation of the mold, typically made of hardened steel. It holds all other components in place.
Mold Core: Forms the internal features of the part and withstands clamping pressure. The core and cavity together create the shape of the part.
Auxiliary Parts: These parts support the mold but do not directly shape the part. Examples include locating rings, ejector pins, and sprue bushings.
Auxiliary Systems
Support the main functions of the injection molding process, such as cooling and ejection.
Dead Corner Handling Structures: These structures are designed to handle difficult-to-reach areas in the mold, such as undercuts or sharp corners.
Slide: A mechanism used to manage undercuts or complex areas by sliding during the molding cycle.
Hydraulic Cylinder: Provides the necessary force to move slides for undercut removal.
Angled Ejector Pins: These ejector pins move at a specific angle to help eject parts from hard-to-reach areas in the mold.
?