What is Precision Injection Molding? And How Does It Work?

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.

1.Factors affecting precision injection molding mold accuracy

1. Cavity Dimensional Accuracy
2. Exact location of the cavity
3. Parting surface accuracy
4. Material selection
5. Dimensional tolerances of general precision molds
6. Number of cavities in mold design
7. Thickness of base plate, support plate and cavity walls
8. Runner size
9. Precision mold material (preferably alloy steel with high mechanical strength)
10. Design engineering

2.Choose a precision injection molding machine

Precision injection molding machines are best operated with high pressure. This helps improve the quality and overall accuracy of plastic parts. An injection pressure of about 392 MPa can reduce the shrinkage coefficient to zero. In addition, when the injection pressure is maintained at around 392 MPa, the mechanical strength of the part is significantly improved. At the same time, as the maximum injection pressure increases, the efficiency of the injection rate also increases.

3.Main structural features of precision molding machines

1. Clamping system rigidity – moving platen and fixed platen are controlled between 0.05-0.08mm
2. Part size tolerance
3. Mold speed (opening and closing)
4. Plasticizing components – including screw, screw head, barrel, check ring, etc.
5. Precision injection molding machines should also be able to manage the repeatability and accuracy of products.

4.How does precision injection molding work?

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

As the precision and complexity of technology increase, the world requires more and more complex processes to mold plastics into specific shapes, such as SCAG zero turn parts, also known as SCAG zero turn mower parts, for specialized industries such as automotive, pharmaceuticals, medical devices, information technology and other service industries.

5.Additional suggestions for precision injection molding

1. This process is beneficial because it is more economically viable.
2. The process is also a new and greatly enhanced solution to optical problems that arise in contract manufacturing and scientific molding of technical products.
3. 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.
4. 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.
5. Polymer optics in precision injection molding are key to developing high-precision molds, giving the plastic injection molding development process several unique advantages.