How to Maintain and Care for Injection Mold Components

The maintenance and upkeep of injection mold components should focus on six core aspects: cleaning, rust prevention, lubrication, inspection and repair, storage management, and usage precautions. The specific details are as follows:

1. Cleaning and Maintenance

Daily Cleaning: After each production run, the mold must be thoroughly cleaned, including the cavity, parting surface, ejector pins, slides, and other components. Use a copper brush or soft cloth to remove residual plastic and dust. Avoid using steel tools to prevent scratching the mold surface. For stubborn residues, a specialized cleaning agent can be used.

Cooling Water Channel Cleaning: Cooling water channels are prone to scale and rust buildup, affecting heat exchange efficiency. Before each production run, use compressed air to blow away impurities from the water channels. Weekly, use a specialized cleaning agent to circulate and flush the water channels to remove scale. If the mold is to be shut down for an extended period, drain the water from the water channels and dry them to prevent rusting of the inner walls.

2. Rust Prevention Treatment

Short-term Rust Prevention: For short-term mold shutdowns (1-3 days), after cleaning, spray a thin layer of rust inhibitor onto key areas such as the cavity, parting surface, and ejector pins. Choose a product with good volatility and minimal residue to avoid affecting subsequent production.

Long-term Rust Prevention: For long-term mold storage, comprehensive rust prevention treatment is required. After cleaning the mold, evenly spray with long-lasting rust-preventive oil to form a protective film. Wrap the mold with cling film or rust-proof paper to isolate it from moisture. Store in a dry, ventilated environment with a suitable temperature (10-30℃) and humidity not exceeding 40%, away from corrosive chemicals such as acids and alkalis. Check the rust prevention status monthly. If the protective film is damaged or signs of rust are found, rust prevention treatment must be repeated.

3. Lubrication and Maintenance

Lubricant Selection: Use high-temperature and high-pressure resistant grease, such as molybdenum disulfide grease, which can maintain stable performance under high-temperature environments and effectively reduce the coefficient of friction of components.

Lubrication Frequency: Adjust the lubrication frequency flexibly according to the actual usage of the mold. Molds operating continuously at high temperatures consume grease quickly and require lubrication multiple times daily; molds used infrequently only need lubrication once a week.

Lubrication Areas: When applying grease, ensure even coverage of component surfaces and mating joints, such as the rods and heads of ejector pins, the contact surfaces of guide pillars and guide sleeves, and the sliding tracks of slide blocks.

4. Inspection and Maintenance

Daily Inspection: Before each production run, a comprehensive inspection of the mold's appearance, fasteners, cooling/heating system, and moving parts is required. Check the mold surface for dents or deformation, and ensure the parting surface is clean and free of foreign objects; confirm that locking bolts, locating pins, and other fasteners are not loose; clear the cooling water channels; check the heating coils and thermocouple connections for secure wiring; manually test the flexibility of the ejector mechanism, slide blocks, and angled ejectors, and apply specialized grease.

Regular Maintenance: Establish a regular maintenance system based on the mold's usage frequency and operating conditions. For example, disassemble the hot runner weekly to clean accumulated material and check for aging seals; disassemble easily worn parts such as ejector pins and sliders monthly, polish worn areas with metallographic sandpaper, and replace excessively worn parts; perform a complete mold disassembly annually, ultrasonically clean all components, check the wear of mold base guide pillars and guide sleeves, and repair or replace them as necessary.

5. Storage Management

Storage Environment: The mold should be stored in a dry, ventilated environment with a suitable temperature and humidity not exceeding 70%, avoiding the effects of moisture and high temperatures.

Storage Method: The mold should be stored on shelves, paying attention to dust and corrosion prevention. For precision parts, such as locating rings and sprue sleeves, protective covers should be added to prevent impact.

6. Usage Precautions

Avoid Overload: Avoid excessive injection pressure and speed to prevent damage to the mold.

Proper Cooling: Avoid prolonged continuous operation; allow the mold adequate cooling time to prevent overheating, deformation, or damage.

Standard operating procedures: During shift handover, operators should not only hand over key production and process records, but also provide a detailed explanation of the mold's usage status. During production, the mold's condition should be closely monitored; if any abnormalities are found, the machine should be stopped immediately for inspection.

Qingdao Xueyu Molding Products Co., Ltd. is mainly engaged in the design and manufacturing of injection molds, injection molding and secondary processing (spraying, pad printing, ultrasonic welding, stamping), etc. For more information about injection mold components, please contact us.

Website: www.xyzmould.com

Address: No.18 Henan Head Road, Henan Head Community, Jihongtan Street, Qingdao Industrial Park, Shandong Province, China

Email: wangmiaotian8@163.com