Standard Acceptance Checklist for Plastic Mold Trial Run

Mold trial run is the core link to verify mold structural stability, molding performance and product dimensional consistency. Standardized unified acceptance standards can effectively eliminate hidden dangers such as cavity scratch, dimensional out-of-tolerance, mold sticking and abnormal cycle in advance, avoiding mass production failure and repeated mold modification. The complete acceptance system covers pre-trial inspection, molding process verification, product quality detection, mechanical structure acceptance and mass production safety adaptation, suitable for all kinds of plastic mold trial acceptance.

1. Pre-Trial Basic Mold Inspection

Check the consistency between physical mold and design drawings to ensure that inserts, sliders, lifters, gates and exhaust structures are completely compliant without arbitrary modification. Conduct full water pressure test on cooling channels to ensure no blockage, water leakage and uniform heat dissipation. Check the ejection system to ensure that thimbles, sleeves and ejector plates move smoothly without jamming, with complete reset springs and limit sensors. Verify the matching precision of guide pillars, guide sleeves and positioning structures to ensure tight mold closing and no abnormal friction. Check the depth and position of exhaust grooves to ensure smooth exhaust without flash and trapped air. Inspect cavity polishing, nitriding and heat treatment quality to eliminate sand holes, cracks and welding defects.

2. Molding Process and Runner System Acceptance

Verify the melt filling state to ensure smooth feeding without jetting, scouring and material splashing. Confirm that weld lines fall on non-key non-stress areas without obvious depression and bubble defects. Optimize the molding cycle to ensure stable and efficient production and meet mass production capacity standards. Ensure that injection and holding pressure are within the normal load range of the equipment, no mold expansion and flash under high pressure. Check the demolding state of main runner and shunt runner to ensure no sticky material and cold material residue, and cold material wells work effectively to avoid surface particle defects.

3. Product Appearance and Dimensional Acceptance

Conduct full appearance inspection of trial products to eliminate shrinkage, bubbles, silver lines, scorching, scratches and layered defects. Control parting line and thimble mark height within drawing tolerance. Sample 10 consecutive mold products to detect key assembly sizes such as outline, hole position, buckle and screw column, ensuring stable data and all within tolerance. Verify product assembly performance with moderate tightness and no assembly gap deviation. Detect product warpage deformation after placement to ensure compliance with standard values. Confirm that parting surface and insert gap flash are tiny, easy to clean, and no progressive deterioration in continuous production.

4. Mechanical Moving Structure Acceptance

Test the sliding and locking stability of sliders to ensure no jamming, impact and backward displacement under high injection pressure. Check the movement of lifters to ensure smooth ejection and resetting without scraping the cavity, no top whitening and top cracking defects. Verify the stress uniformity of the ejector plate to avoid unbalanced ejection deformation. Check mold opening and closing buffer performance to ensure stable operation without violent collision and abnormal noise. Inspect mold rust prevention and dustproof structure to meet daily maintenance and long-term storage requirements.

5. Mass Production Adaptation and Safety Acceptance

Verify that mold hoisting and clamping structures are compatible with mainstream production equipment. Test all induction safety switches to ensure sensitive interlock protection and effective prevention of mold collision accidents. Complete 100 consecutive mold stability tests to confirm no gradual wear and performance attenuation of the mold. Check the convenience of mold maintenance and replacement of vulnerable parts. Ensure complete delivery documents including process parameters, size detection reports and material certificates.

Summary

Standardized mold trial acceptance realizes full coverage of mold hardware, process performance, product quality and production safety. Comprehensive inspection and verification can eliminate mold hidden dangers in advance, reduce repeated rework costs, ensure stable and efficient mass production after mold handover, and improve overall production efficiency and product yield.