Mold surface wear

In the '2079851475616104458 (vacuum forming) production process, the product exhibits the quality defect of "Mold surface wear". The specific manifestation is that wear of the mold cavity surface leads to a decline in product quality. This defect is relatively common when processing materials such as PP, PS, PET, PVC, ABS sheets, and its occurrence conditions are usually related to the unreasonable settings of sheet heating temperature, forming pressure/vacuum level, mold temperature, and cooling time. When the "Mold surface wear" situation is severe, it will cause a series of chain quality defects in the product in terms of appearance, dimensional accuracy, mechanical properties, etc., which not only reduces the functionality and safety of the product in use, but also directly increases the scrap rate and production cost. Therefore, this problem requires systematic diagnosis and optimization from multiple dimensions such as material selection, the status of the '2079851475616104458 machine, heating oven, mold, and vacuum/air pressure system, and sheet heating temperature, forming pressure/vacuum level, mold temperature, and cooling time.

1. Long-term use wear. Mechanical wear and looseness during long-term equipment operation will cause clearance changes, precision decline, and unstable operation, thereby causing various process and quality problems. Establishing a regular inspection and preventive maintenance system for equipment operating status and promptly repairing or replacing worn parts is a necessary measure to maintain equipment precision and process stability. 2. Insufficient mold material hardness. The mold is the core tool that gives the product its shape and surface quality. Unreasonable mold design, such as improper runner/gate dimensions, insufficient venting, and inadequate draft angle, will directly cause molding defects. The machining accuracy, surface treatment quality, and daily maintenance status of the mold also directly affect product quality. In addition, the insufficient overall coordination of sheet heating uniformity and stretch ratio control is also a factor that cannot be ignored; there are complex interactions and coupling relationships among the process parameters, and the deviation of any one parameter may aggravate the degree of "Mold surface wear" through chain effects. In terms of equipment maintenance, the regular overhaul and precision confirmation of the '2079851475616104458 machine, heating oven, mold, and vacuum/air pressure system are not in place, causing the actual operating parameters of the equipment to deviate from the process requirements, which will also become a potential inducement of the "Mold surface wear" problem.

1. Surface hardening treatment. Before implementing this measure, its feasibility and expected effect should be fully evaluated, and the details of the plan should be communicated and confirmed with relevant technical personnel; during implementation, closely monitor changes in key quality indicators, promptly record and feedback the adjustment effect, and form reusable process experience. 2. Replace with wear-resistant mold materials. When replacing parts, original factory spare parts of the same or higher specifications should be selected to ensure that the installation accuracy and fitting tolerances meet the equipment technical requirements. After replacement, relevant parameters need to be recalibrated and trial runs performed to verify the effect; normal production can only be resumed after confirming that expectations are met. It is recommended to establish a spare parts life cycle management ledger. 3. Perform regular maintenance. Equipment maintenance should establish a three-level preventive maintenance system: daily inspection, regular maintenance, and planned overhaul. The operating data and wear trends of key components should be continuously statistically analyzed, and the probability and time window of potential failures should be predicted through condition monitoring, transforming passive fault repair into active condition-based maintenance. In terms of material management, incoming inspection of raw materials upon arrival and in-process inspection of work-in-progress should be strengthened, and the key performance indicators of PP, PS, PET, PVC, ABS sheets should be strictly controlled to ensure the stability of molding quality from the source.

In summary, the causes of the "Mold surface wear" problem can be attributed to the combined action of multiple factors such as Long-term use wear, Insufficient mold material hardness. Solving this problem requires starting from aspects such as Surface hardening treatment, Replace with wear-resistant mold materials and adopting systematic governance measures. In actual production, it is recommended to establish a prevention and rapid response mechanism for this problem, and achieve stable production and continuous improvement through sheet heating uniformity and stretch ratio control.