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MIM De-molding: Mimo's Strategies for Smooth Production

Views: 15     Author: Site Editor     Publish Time: 2025-01-15      Origin: Site

De-molding in Powder Metallurgy Injection Molding (MIM): A Unique Process

Powder Metallurgy Injection Molding (MIM) is a technology that combines metal powders with binders and uses injection molding to create complex parts. Many people wonder: "Do MIM products require de-molding?" The answer is yes, but the process has its own unique characteristics and requirements.

Differences Between De-molding in MIM and Traditional Injection Molding

De-molding involves removing the product from the mold cavity, overcoming the resistance of the mold. Traditional injection molding requires a certain draft angle to ensure smooth ejection. In MIM, due to the unique material properties and the subsequent sintering process, de-molding is equally important but has different specific requirements.

1. Draft Angle Design

In MIM, the draft angle is typically smaller because the mixture of metal powder and binder has certain flowability and demolding characteristics. Additionally, since sintering causes some shrinkage, mold design takes into account both draft and dimensional changes.

2. Mold Surface Treatment

To reduce de-molding resistance, the mold cavity surface in MIM is usually subjected to high-precision polishing. Sometimes, special coatings like titanium nitride (TiN) are applied to further enhance demolding performance.

3. Influence of Debinding and Sintering Stages

Unlike plastic injection molding, MIM products undergo debinding and high-temperature sintering after initial molding, which affects the final dimensions and surface accuracy. Therefore, mold draft design must consider both smooth demolding during molding and dimensional stability during subsequent processing.

Impact of De-molding Issues on Product Quality

Improper de-molding design can lead to the following problems:
  • Product Deformation: Uneven forces during demolding can cause surface scratches or internal stress concentration, affecting subsequent strength and durability.
  • Mold Wear: Difficult de-molding can exacerbate mold wear, increasing maintenance costs.
  • Reduced Efficiency: Inefficient demolding extends production cycles, affecting delivery times.

Mimo's De-molding Solutions

As a professional MIM manufacturer, Mimo has extensive experience in mold design and manufacturing. We focus on the following aspects:
  • Precision Design: Using advanced 3D modeling technology, we optimize draft angles and product structures to ensure smooth demolding.
  • Surface Treatment: We employ high-precision mold manufacturing processes and special coatings to reduce demolding resistance.
  • Process Control: We strictly control debinding and sintering parameters during production to ensure dimensional and shape stability of the products.

Conclusion

MIM products do require de-molding, but the process is different from traditional injection molding. With proper mold design and process control, de-molding can be successfully completed without affecting product quality. In the MIM industry, rational de-molding design not only improves production efficiency but also ensures product performance and aesthetics. If you are interested in powder metallurgy injection molding, feel free to contact Mimo for more professional information!


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