What is precision molding?

Precision injection molding is a highly technical process that requires the use of precision molds and precision machines. The precision molding process is different from the 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 accuracy of a part is largely determined by the precision injection mold and its suitability to meet the engineering requirements of the design.

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The accuracy of the mold is the result of a number of factors, including:

Cavity Dimensional Accuracy

exact location of the cavity

Parting surface accuracy

Material selection

Dimensional tolerances of general precision molds

Number of cavities in mold design

Thickness of base plate, support plate and cavity walls

runner size

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

design engineering


How does precision molding work?

The process of molding plastics into special price and calculated shapes through CNC precision machining is called polymer optics.

As technology advances in precision and sophistication, the world requires increasingly sophisticated processes to mold plastics into specific shapes for specialized industries such as automotive, pharmaceuticals, medical devices, information technology and other service industries.

Here are some additional tips for precision molding from molding consultants.

This process is beneficial because it is more economically viable.

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

A custom injection molding process is not an appropriate method for developing the optics required for a wide 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 has led to precision injection molding (PIM) technology, which will allow molders to develop plastic equipment at affordable prices, 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 several unique advantages.


Choose a precision machine

Precision forming machines are preferably high pressure. This helps improve the quality and overall accuracy of plastic parts. An injection pressure of approximately 392 MPa reduces the shrinkage coefficient to zero. Furthermore, when the injection pressure was kept around 392MPa, the mechanical strength of the part was significantly improved.

Furthermore, as the maximum injection pressure increases, the efficiency of the injection rate increases.


The following are the main structural features of the precision molding machine:

Stiffness of clamping system – the movable template and the fixed template are controlled between 0.05-0.08mm

Part Dimension Tolerance

Die speed (open and close)

Plasticizing parts – including screws, screw heads, barrels, check rings, etc.

Additionally, the precision molding machine should be able to manage product repeatability and accuracy.

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