Precision Mold

What is a precision mold?

A precision mold is the product that is made by the precision plastic injection molding process when the precise production, which applies the plastic mold as the prototype of the products, is required. In addition, the precision mold can be the alternative of the mold that is made of metal alloys, which reduces the cost on the materials and manufacturing processes.

The plastic injection molding is one of the molding methods and specialized in producing plastic molds. Since the plastic fillers that are utilized as the materials are cheaper than metal materials, and the molding process is also simpler due to the special properties of plastic. Therefore, the significant costs that are spent on producing metal molds can be saved when the plastic injection molding is applied.

The plastic injection molding produces plastic molds by the compressing and pulling forces that are given from the runner and the injector. With the adjustment of pressure and temperatures, the plastic molds can be made after undergoing melting, compressing, solidifying, and cooling processes.

Compared to the molds that are made of metals, which may be hard and stable enough when contacting high heat and pressure, the plastic molds are relatively softer but can remain the stiffness of the molds, which still make them be widely adopted for further manufacturing processes when the cost is what the manufacturers may concern.

In order to refine the applications that the plastic molds can be adopted for, the precision injection molding is invented. As the name implies, this advanced molding process pursues the optimal precision in the production of plastic molds, so that the molds that are made under this circumstance are usually applied for a variety of industries, including the automotive, medical devices, pharmaceutical industries, etc.

What are the required elements for the production of precision molds?

Aligning devices
The aligning devices in the precision injection machine are the guide pins. In addition to adjusting the correct position of the precision molding components, the guide pins can also facilitate the molding process by allowing the ejector plate to give and release pressure to the cavity of the platen.

● Work holding devices
The work holding devices contain the clamping plate, ejector plate, and the ejector back plate that holds the ejector on the one end, and there is also another clamping plate that is set on the other end, which is used to hold the cavity and the core that comprise the platen of the molds.

The runner is one of the tools in the precision injection molding, which is used to fill the cavity and the core of the platen with molten plastic fillers, in order to conduct the process of fabricating the plastic molds.

● Ejectors
The ejectors are the other tools that are in charge of releasing the runner as well as the pressure that is given from the runner, and providing the pulling force to the solidified and cooled plastic mold out of the cavity and the core, which play an important role for the completion of the molding processes.

● Platen 
The plastic molds act as the prototypes of the products that are made by using them as the bases, and the platen is the prototype of the plastic molds. In other words, the plastic mold is formed based on the shape of the platen.

The platen contains a cavity and a core, which receive the molten plastic fillers from the runner, and provide the environments for the plastic fillers to solidify and cool after they are filled inside the platen.

How a precision mold is made?

To make a precision mold, no matter for whatever sizes or forms, there are four main steps and some consideration to follow, including drying, heating, injecting, and ejecting.

● Drying
In the precision injection molding process, the material consistency is the most significant parameter that should be complied with definite carefulness, as the aim of the manufacturers that produce precision molds is to high precision of the products.

The material consistency of these plastic molds has a lot to do with the humidity of the materials as well as the molding environment. Once there is excessive moisture that exists in the materials or the molding environment, it may result in the deformation of the products when the molds cool off and the moisture condenses. Therefore, before the processes begin, drying the materials and the environment is the first thing that the operator should do.

● Heating
After making sure the plastic materials are dry enough, they should be heated and melted that they can be filled into the platen of the injection machine.

● Injecting
When the materials become molten, they would be injected into the cavity and the core of the platen by the runner that allows them to flow into the platen through the bush.

After that, once the molten plastic fillers are evenly distributed into the platen, they would be kept inside in order to wait for the solidifying and cooling of the mold.

● Ejecting
If the plastic mold is formed and cooled off, the ejectors that are held by the ejector plate would offer the pulling force, which releases the plastic mold out of the platen, and completes the processes.

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