Functions of Mold Base Parts

moldpartsFixed 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.

moldparts1Support 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).

This entry was posted in Mold Components, Mold Design and tagged , , by Elito. Bookmark the permalink.

About Elito

Mold Design Engineer (contract designer) with more than 13 years experience creating mold designs for high volume manufacturing. Have necessary know-how to produce high quality injection molds at the least processing cost and most timely manner available. Superior problem-solving and time-management abilities. Worked with Japanese mold design team. Proficient with 2D CAD, 3D CAD, MS Office.

5 thoughts on “Functions of Mold Base Parts

  1. Thanks for providing geat content on injection mold making. I will be visiting often to learn more. NHCV is manufacturers representative supplying core pins sleeves, injector pins and blades for medical, Aerospace, communications die castings and all other industries.

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