What is Precision Injection Molding?

Precision Injection molding is a highly technical process that requires the use of precision molds and precision machines. The precision injection molding process is different from traditional injection molding technology. The process is necessary to develop precision plastic parts with complex geometries that can replace high-precision metal parts in a variety of industrial applications.

The precision of a part depends to a large extent on the precision injection mold and its suitability to meet the engineering requirements of the design.

The accuracy of a mold is the result of several factors, including

Accuracy of cavity dimensions

Accurate position of the cavity

Parting surface accuracy

The choosing of material

Dimensional tolerance of general precision molds

Number of cavities in mold design

The thickness of the base plate, support plate, and cavity wall

Size of runner

Precision mold material (preferably alloy steel with high mechanical strength)

Design engineering

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How does precision molding work?

The process of molding plastics into specially priced and calculated shapes through CNC machining is called polymer optics.

As technology evolves in terms of precision and complexity, the world requires increasingly sophisticated processes for molding plastics into specific shapes used in specialized industries such as automotive, pharmaceutical, medical device, information technology, and other service industries.

Mold by CNC Machining

Here are some additional tips from the molding consultants on the precision injection molding.

This process is beneficial because it is more economically viable.

The process is also a new and greatly enhanced solution to the optical problems that arise in the contract manufacturing and scientific molding of technical products.

The custom injection molding process is not an appropriate method for developing the optical components needed for a variety of high-precision products. The precision injection molding process allows manufacturers to customize the process to meet the needs of the molded product.

The resulting research and development led to Precision Injection Molding (PIM) technology, which will allow molders to develop plastic devices at an affordable price, but with very high-quality control and precision.

Polymer optics in precision injection molding are key to developing high precision molds, giving the plastic injection molding development process a variety of unique advantages.

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Selecting Precision machines

Precision molding machines should preferably be high pressure. This helps improve the quality and the overall precision of the plastic parts. An injection pressure of around 392 MPa reduces the shrinkage factor to zero. Additionally, the mechanical strength of the part increases significantly when the injection pressure is kept around 392MPa.

Further, the efficiency of the injection rate improves when maximum injection pressure is increased.

Following are the main structural features of precision molding machines:

Stiffness of clamping system- the moving and fixed templates are controlled in between 0.05 to 0.08mm

Dimensional tolerance of parts

Die speed (open and closed)

Plasticizing parts- these include the screw, the screw head, material barrel, the check ring, etc.

Additionally, precision molding machines should be able to manage the repeatability and accuracy of a product.

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