There's more to injection molding (IM) than producing plastic Barbie Doll shoes and Action Man weapons. Not only plastic, but any material that can be somehow liquefied and injected into a mold can be subjected to the IM process. This applies to polymers, sugar in its many forms, glass, metals and other materials. IM is used to make everything from precision machined airplane parts to jelly alligators.
Chocolates, futuristic plastic chairs, dustpans and even shoes may be made by injecting some material into a mold. Molds are designed by designers and engineers and then handed over to a moldmaker to transform the design into a metal mold, which is finally precision-machined. The process, which has been around since the middle of the 19th century, is extremely versatile and gives rise to an infinite number of widgets and parts for sewing machines, automobiles and rocket ships.
One application for the art is in the manufacture of collectible toy soldiers and military miniatures. If there was a war, chances are there are miniature toy soldiers for some enthusiast to recreate it. A horseback-mounted Duke of Wellington can set a collector back in the realm of $200. Intricately detailed and meticulously painted, lesser soldiers can be acquired for a much more reasonable price. Of course, when you are purchasing hundreds of the brave soldiers, it adds up pretty fast.
Electric toy train enthusiasts are avid consumers of IM technology. Where do you think the little toy trees and little toy engineers and signalmen come from? The amount of authenticity and detail that goes into making these items is breath-taking. Built to last, these pieces are often manufactured from molded metal so they are sufficiently robust to be passed down from generation to generation.
To manufacture parts from metal, the starting material is first ground into a fine dust and then combined with a binder to form a feedstock that is fed through a hopper into a heated tube. The mixture is pushed through the tube using a linear actuator, something that looks like a screw. The material then goes into a mold, is cooled and then ejected.
The vast range of objects that can be produced using IM is astounding. The injecting and molding machines are themselves built from parts that are the product of IM technology.
Many different industries feed into the IM process. Computer software, polymers, binders and machinery are all necessary to fuel the process. It will, however, be fun to see how IM technology evolves in response to the up and coming 3D printing process.
Chocolates, futuristic plastic chairs, dustpans and even shoes may be made by injecting some material into a mold. Molds are designed by designers and engineers and then handed over to a moldmaker to transform the design into a metal mold, which is finally precision-machined. The process, which has been around since the middle of the 19th century, is extremely versatile and gives rise to an infinite number of widgets and parts for sewing machines, automobiles and rocket ships.
One application for the art is in the manufacture of collectible toy soldiers and military miniatures. If there was a war, chances are there are miniature toy soldiers for some enthusiast to recreate it. A horseback-mounted Duke of Wellington can set a collector back in the realm of $200. Intricately detailed and meticulously painted, lesser soldiers can be acquired for a much more reasonable price. Of course, when you are purchasing hundreds of the brave soldiers, it adds up pretty fast.
Electric toy train enthusiasts are avid consumers of IM technology. Where do you think the little toy trees and little toy engineers and signalmen come from? The amount of authenticity and detail that goes into making these items is breath-taking. Built to last, these pieces are often manufactured from molded metal so they are sufficiently robust to be passed down from generation to generation.
To manufacture parts from metal, the starting material is first ground into a fine dust and then combined with a binder to form a feedstock that is fed through a hopper into a heated tube. The mixture is pushed through the tube using a linear actuator, something that looks like a screw. The material then goes into a mold, is cooled and then ejected.
The vast range of objects that can be produced using IM is astounding. The injecting and molding machines are themselves built from parts that are the product of IM technology.
Many different industries feed into the IM process. Computer software, polymers, binders and machinery are all necessary to fuel the process. It will, however, be fun to see how IM technology evolves in response to the up and coming 3D printing process.
About the Author:
Henry A. Parker has taught plastics molding techniques for over 15 years. He specializes in injection molding and thermoforming. If you are interested in learning more plastic solutions then he recommends you visit his friends at PTM: Custom Plastics Injection Molding Company.