Gingery books are always good do it your self books. Of course you needs tools as you would to build any machine. Small injection molding machines go for about $1000. To build one you will have to buy some stuff like the heating cartridges and steel for the parts. Half the fun of a Gingery book is actually building the machines. So for a $100 in supplies and a day to a week making and assembling the parts you will have a working machine. Also Gingery books are easy to read and understand.
The injection molding machine converts granular or pelleted raw plastic into final molded parts via a melt, inject, pack and cool cycle.
Components of Injection Moulding Machine
A typical injection molding machine consists of the following major components,
- Injection system
- Hydraulic system
- Mold system
- Clamping system
- Cooling System
- Control system
Injection System
The injection system consists of a hopper, a reciprocating screw and barrel assembly and an injection nozzle. This system confines and transports the plastic as it progresses through the feeding, compressing, degassing, melting, injection Injection Molding Machine and packing stages.
Hydraulic System
The hydraulic system on the injection molding machine provides the power to open and close the mold, build and hold the clamping tonnage, turn the reciprocating screw, drive the reciprocating screw and energize ejector pins and moving mold cores. A number of hydraulic components are required to provide this power, which includes pumps, valves, hydraulic motors, hydraulic fittings, hydraulic tubing, and hydraulic reservoirs.
Mould system
The mold system consists of tie bars, stationary and moving platens as well as molding plates (bases) that house the cavity, sprue and runner systems, ejector pins, and cooling channels. The mold is essentially a heat exchanger in which the molten thermoplastic solidifies to the desired shape and dimensional details defined by the cavity.
Clamping System
The clamping system opens and closes the mold, supports and carries the constituent parts of the mold and generates sufficient force to prevent the mold from opening. Clamping force can be generated by a mechanical (toggle) lock, hydraulic lock or a combination of the two basic types.
Cooling System
Cooling time is by far the most dominate time consumer in the injection molding cycle. A long cycle time means that the molder must charge more for the same part. During Product Design we should use thermal analysis capabilities to specify the cooling design for the tools. The result will be a low cost tool that will run fast and keep your cost per part as low as possible.
Control System
The control system provides consistency and repeatability in machine operation. It monitors and controls the processing parameters including the temperature, pressure, injection speed, screw speed, position and hydraulic position. The process control has a direct impact on the final part quality and the economics of the process.
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Toshiba IS2500 DE Plastic Injection Moulding Machine
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Added: August 31, 2010
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{ 4 comments… read them below or add one }
For as interesting as the promo describes this book, it is a very nothing book. You soon realize that the device the author built has absolutely no practical purpose other than to form the basis for the book.
A quick read and definitely enjoyable in knowing how “possible” it is to make your own 1/2 oz. injection molding machine. Only major problem… You need a few tools; probably a bandsaw, welding equipment, a good drill press and most likely a lathe. But then again, if you want to make some molds for the IM machine you probably already have the tools I listed! The point is, it’s a good learning project, but you’re better off buying your own small IM machine for a few hundred bucks…
at 120+ pages, Secrets of building a plastic injection molding machine, is a pretty quick read. I haven’t gotten around to trying to build such a device yet, cause honestly I’ve never built anything before..
a few words though. The deivce once built works with strips of plastics you’ve collected from old recyclables around the house.. soda bottles, etc.. which is pretty cool.
the machine itself however consists of about 6 pages, of which 80 % is screws and bolts and washers.. The back of the books has a very small list of possible suppliers for some of the more unique parts, and it looks like the machine itself will take abour roughly 100 bucks to make, give or take a little.
So if you’ve already built a few things then by all means this is gonna be a good time for you, to expand what you can do.
if you haven’t touched a screw driver lately, you might want to start somewhere else…
This book is a good basic book on plastic molding
but has nothing about the use of magna plastics and polymer films
in casting or injection molding.
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