To those experiencing cavity wear during injection molding

～Suppressing Cavity Wear with Mold Maintenance Services to Support Extended Mold Life and Quality Stabilization～

When injection molding continues for a long period, the mold cavity gradually undergoes wear. Even if there are no noticeable changes in the initial stages, as wear accumulates, dimensional accuracy and aesthetic quality may decline, leading to the production of defective parts and a shortened mold life. To consistently maintain quality and extend mold life, it is crucial to utilize mold maintenance services and implement appropriate measures according to the progression of wear.

■ What is Cavity Wear? Causes and Countermeasures

Cavity wear refers to the phenomenon where the molding surface inside the mold, into which resin is injected, gradually wears down due to repeated use. As wear progresses, it can lead to changes in product dimensions, reduced parting line accuracy, and deterioration of surface quality. Since it can be difficult to detect visually in some cases, early detection through regular inspections and appropriate maintenance are crucial.

■ Main Causes

Cavity wear primarily progresses due to the following factors:

• Prolonged Use: The molding surface gradually wears down as the number of shots increases.
• High-Pressure Molding: Repeated application of high injection pressure and holding pressure can increase the load on the cavity and promote wear.
• Use of Hard Materials: Resins containing fillers such as glass fiber or hard materials can make the cavity surface more susceptible to wear.

When these conditions overlap, cavity wear may progress earlier than expected.

■ Main Countermeasures

To suppress cavity wear and use molds stably for a long period, preventive maintenance is essential.

• Consider mold material selection: By selecting a mold material suitable for the resin and molding conditions used, wear can be reduced.
• Regular Maintenance: Regularly inspect the wear condition and perform repairs or adjustments as needed.
• Enhance Surface Treatment: Consider surface treatments appropriate for the application and operating environment to improve wear resistance.

By implementing countermeasures when wear is minor, major repairs can be avoided, leading to extended mold life and reduced maintenance costs.

■ Key Points for the Ordering Party

When consulting about cavity wear, sharing the following information will lead to more appropriate improvement proposals:

• Number of mold shots
• Type of resin material used
• Presence or absence of fillers such as glass fiber
• Details of current defects or dimensional changes
• Mold maintenance history and repair history

By understanding the progression of wear based on this information, appropriate decisions can be made regarding repairs, part replacements, and future maintenance plans.

■ Features of SHINKO PRECISION VIETNAM's Mold Maintenance Service

At SHINKO PRECISION VIETNAM, we specialize in precision injection molds under 100 tons, and after confirming the cavity wear condition, we propose the optimal maintenance method. In addition to repairing worn parts, we also provide preventive maintenance aimed at extending mold life, supporting quality stabilization. Furthermore, we offer improvement proposals based on the materials used and molding conditions, as well as mold design consulting aimed at improving durability, supporting the establishment of a long-term stable production system.

Cavity wear can prevent quality degradation and major mold repairs by taking early countermeasures. If there are symptoms suggesting mold wear, such as dimensional changes or aesthetic defects, we will inspect the mold's condition and propose the optimal maintenance method.