Fixed Clamping Plate
Holds The fixed side of the mold to the fixed platen of the injection machine
Locating Ring
It is used to locate the center of the injection machine so that the sprue bushing and the nozzle are aligned. Commonly fitted into the counterbore in the fixed clamping plate.
Fixed Cavity Plate
Used to hold the fixed cavity block, leader pin/bushing, and sprue bushing.
Movable Cavity Plate
Used to hold the movable cavity block, leader pin/bushing.
Movable Clamping Plate
Holds The movable side of the mold to the movale platen of the injection machine.
Spacer Block
Mounted between the movable clamping plate and the movable cavity plate to give space and allow the ejector plate to move when ejecting the
part.
Ejector Retainer Plate
Holds the ejector pins and the return pins in place.
Ejector Plate
Pushes the ejector pins and return pins at the same time. Mounted to the ejector retainer plate to form the ejector unit.
Support Pillars
Bars placed between the spacer blocks to give additional support to the movable cavity plate.
Sprue Bushing
Has a tapered hole through which the material is forced into the runner. It is butted up against the nozzle of the injection machine.
Return Pins
Same as ejector return pins. Make sure that the ejector unit is back in its original position when the mold closes.
Leader Pins and Bushings
Precisely align the two halves of the mold base (fixed and movable).
Cavity and core
Core and cavity can be classified into 2 methods, integrated and nested method. You can
choose which method will define your cavity and core.
Integrated: When the molded part is formed directly by the die.
Nested: When the molded part is formed by the die components.
Nested Cavity and Core
Benefits:
There is no restriction to the geometry of the molded part. Processing efficiency can be done when components are separated.
Mold materials can selected for better wear resistance and temperature control.
Damaged components can be replaces easily and cost effectively.
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Injection Mould consists of movable mold and stationary mold. Movable mold is fixed on the movable plated of injection molding machine, and stationary mold is fixed on the stationary platen of injection molding machine. While injection molding, movable and stationary mold close and form the feed system and cavity. When opening mould, movable mold and stationary mold separate for taking plastic product out.
Mould structure varies with plastic varieties and performance, plastic product’s shape and structure and injection machine type, but its basic structure is consistent. Mould mainly consists of feed system, temperature adjusting system, molding components and structural components. And feed system and molding components are the parts that directly contact with plastics,changing with plastics and products. On plastic mould, they are the most complicated and variable parts with highest requirements on processing glossiness and precision.
Feed system is the runner part for plastics to go into cavity from nozzle.It includes main runner,cold-slug well, sub-runner, and sprue.Molding components are the elements forming product’s shape, like movable mold, stationary mold, cavity, core, molding rod, and vent.Typical plastic mould structure is as picture shows here.
A mold plate is any plate required to built a complete mold, in all plate use for molds have the main requirements, they are :
1. Good corrosion resistant
2. Good Machinability.
3. Easy to clean
3. Good heat transfer.
4. Homogeneity of steel.
5. Easy ability.
6. Low Cost.
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your introduction is very useful for those Primary mold technicians
As a new mold designer, I learned a lot of useful things from this article