Solutions for Injection Molding Dimensional Defects

Solutions for Injection Molding Dimensional Defects

Mold Maintenance Services for Fundamental Improvement of Dimensional Accuracy Variations

Dimensional defects in injection molding are critical quality issues directly linked to assembly problems and functional failures. Especially for precision components, even micron-level deviations can affect product performance. Therefore, identifying the root cause and implementing effective countermeasures are essential for stable mass production.

What Are Dimensional Defects in Injection Molding?

Dimensional defects refer to conditions where molded products fail to meet the dimensional tolerances specified in design drawings. The primary causes include:

Mold wear

Thermal expansion and shrinkage differences

Insufficient holding pressure

Mold condition, molding parameters, and product design factors interact collectively to affect dimensional accuracy. In long-term mass production, gradual dimensional deviation often becomes a major source of unstable quality.

Main Causes of Dimensional Defects

1. Mold Wear

Wear of cavities and cores reduces dimensional precision.

2. Thermal Expansion and Shrinkage Variations

Fluctuations in mold temperature and resin temperature cause dimensional instability.

3. Insufficient Holding Pressure

Inadequate compensation for resin shrinkage results in smaller product dimensions.

Particularly in injection molding machines under 100 tons, even slight temperature or pressure changes can significantly impact dimensional accuracy.

Effective Countermeasures for Dimensional Defects

Improving dimensional defects requires comprehensive optimization of molds, product design, and molding conditions.

Mold Maintenance

Repair worn areas

Replace mold components

Restore mold precision

Design Considering Material Shrinkage

Apply dimensional compensation based on resin characteristics

Reduce post-molding dimensional deviation

Optimization of Injection Molding Conditions

Adjust holding pressure

Optimize mold and resin temperatures

Control cooling time

Stabilize dimensional accuracy

Combining these measures helps achieve long-term stable dimensional precision.

Key Information Customers Should Prepare

To accurately analyze and improve dimensional defects, the following information should be shared:

Details of dimensional deviations (which dimensions and how much deviation)

Drawing tolerances and priority dimensions

Resin shrinkage rate and material characteristics

Current molding conditions (temperature, pressure, holding time, etc.)

Mold usage conditions (shot count and maintenance history)

For mass production products, understanding mold condition changes over time is particularly important.

Advantages of SHINKO PRECISION VIETNAM Mold Maintenance Services

SHINKO PRECISION VIETNAM comprehensively analyzes major causes of dimensional defects, including:

Mold wear

Temperature fluctuations

Holding pressure conditions

We provide improvement solutions focused on preventing recurrence and ensuring long-term dimensional stability.

Our Strengths

Precision machining and repair technology specialized for molds under 100 tons

Maintenance proposals focused on extending mold lifespan

High-precision component supply network across Japan, China, Taiwan, and Vietnam

Mold design consulting including shrinkage compensation and molding condition optimization

Issues such as unstable dimensions, dimensional variation during mass production, or suspected mold deterioration can be significantly improved through mold maintenance services. Share your product phenomena and drawing information with us, and we will propose the optimal solution.