5 Points about the Basic Requirements of Injection Mold Design

When starting injection mold design, we can focus on the quality and size of plastic parts, safe and reliable production during injection molding, easy repair of molds, and meeting process requirements during mass production and assembly.

Ensure the quality and dimensional stability of plastic parts

The quality of plastic parts includes appearance quality and internal quality. Excellent appearance quality includes complete and clear structural shape, surface roughness that meets the requirements (including etching and sandblasting, etc.), and no welding marks, silver streaks, shock marks, and black spots.

Injection defects such as spots and black spots. Excellent internal quality includes the absence of injection molding defects such as tissue looseness, air bubbles, and flare spots.

The mold’s manufacturing precision, the injection mold design of logic, and the injection process settings all affect how accurate and stable the dimensions of plastic parts are. The latter two elements are typically the only ones that affect the dimensional stability of plastic parts. Plastic parts have poor dimensional stability, which is typically brought on by oscillations in shrinkage.

The following goals must be accomplished in terms of injection mold design to control the shrinkage of plastic components, in addition to having acceptable and stable injection process parameters:

• A good temperature regulation system controls the temperature of each part of the mold within a reasonable range.

• In the multi-cavity injection mold, the ranking should strive to make the mold reach temperature balance and pressure balance.

• Choose a reasonable gating system according to the structure and size of the plastic parts.

Safe and Reliable during Injection Molding Production

A mold is a tool for high-frequency production. In each production process, its movements must be correctly coordinated, stable, and reliable. The institutions that ensure the safety and reliability of the mold include:

• The fixed-distance parting mechanism in the three-plate mold.

• Guide positioning mechanism.

• The first reset mechanism of the push-piece fixing plate.

• The transmission mechanism and anti-rotation mechanism of plastic parts in the internal thread demolding mechanism.

• Second launch organization.

• Lateral core pulling mechanism.

Injection Mold Design: Easy to Repair

The life of the mold is very high. To facilitate maintenance in the future, the following points need to be done when starting the injection mold design.

• The easily damaged inserts are made into combined inlays to facilitate replacement after damage.

• Lateral core pulling should give priority to the direction on both sides.

• The cooling water should enter the inner mold insert through the mold base.

• The inclined push rod should not slide directly on the push-piece fixing plate.

• The pressing block on the slider is made into a combined pressing block.

• The fixed-distance parting mechanism in the three-plate mold is preferably an external type.

Meet the Requirements of Mass Production

The characteristic of the mold is that it can repeatedly produce the same one or several plastic parts in large quantities, and its life usually requires dozens of times, millions of times, or even tens of millions of times. To do this, the following points must be paid attention to when starting the injection mold design.

• The formwork must have sufficient strength and rigidity.

• The inner mold insert material must have sufficient hardness and wear resistance.

• The mold must have a good temperature control system to shorten the injection cycle of the mold.

• The guiding and positioning system of the mold must be safe, stable, and reliable.

Mold Parts and Assembly can Meet the Manufacturing Process Requirements

The mold structure must make it easy to assemble and disassemble the mold, and the size and structure of the parts must meet the processing technology requirements of the machine tool. To produce molds that meet the requirements at the lowest cost.

The above five points are commonly used in injection mold design. If you are interested in producing molds and developing your new projects, do not hesitate to contact us, we will have a professional team to provide you with high-quality services at any time!