① The demoulding process of refractory prefabricated parts needs to be operated with caution. Usually, demoulding can be carried out only on the premise that the hardening time is not less than 8 hours. This is to ensure that the prefabricated parts have sufficient strength to withstand various stresses during the demoulding process. Of course, we will also flexibly adjust the demoulding time according to the actual weather conditions to meet the hardening needs under different environmental conditions.
After demoulding, the refractory prefabricated parts need to be placed in an environment with suitable temperature and humidity for natural curing. This curing method can ensure that the prefabricated parts gradually reach their design performance in the best condition. For large refractory prefabricated parts above 0.6 tons, we will carry out at least 6 days of curing to ensure that their internal structure and performance are fully stabilized. For small prefabricated parts below 0.6 tons, the curing time is at least 3 days to meet their basic hardening and stability needs.
During the curing process, we will ensure that there is a gap of more than 50mm between the prefabricated parts, which can not only prevent the prefabricated parts from squeezing each other, but also ensure air circulation, which is conducive to the uniform curing and drying of the prefabricated parts. At the same time, we will also pay attention to the stacking method of the prefabricated parts to ensure their integrity and stability, and provide convenience for subsequent handling and use.
② During the demoulding process of the refractory prefabricated parts, we will first use a leather hammer to gently tap the joint between the mold and the refractory prefabricated parts to gradually separate them. This step requires meticulous operation to ensure that the mold and the prefabricated parts can be separated smoothly and safely. Then, we will carefully loosen the mold and remove the prefabricated parts from the mold. During the whole process, we will maintain a high degree of concentration and caution to prevent any damage to the prefabricated parts.
③ After the demoulding is completed, we will carefully check the status of the mold. If the mold is found to be twisted or deformed, this may have an adverse effect on the quality of the product, so we will immediately stop production and make necessary corrections and adjustments to the mold. Our goal is to ensure that every production link is strictly controlled to provide customers with the best quality products.
When the production is finished, we will thoroughly clean the mold to ensure that its surface is clean and free of dirt. Then, we will apply butter to the mold to keep it lubricated and in good condition, and carefully install the mold back to its original position. To ensure the proper storage of the mold, it will be placed in the specified stacking position, which will not only protect the mold from damage, but also ensure that the mold can be found and used quickly and accurately during the next production.
④ When demolding refractory prefabricated parts with holes such as seat bricks, we need to pay special attention to the knocking skills and strength. The knocking should be balanced and powerful, and the strength should be moderate to ensure that it will not be knocked off-center, so as to avoid unnecessary damage to the prefabricated parts. At the same time, in the process of moving the template and extracting the axis core, we must be stable, accurate and light to ensure the accuracy and safety of the operation.
When moving the seat bricks, we must be careful to prevent damage to the corners of the seat bricks and affect their integrity and use effect. After demolding, the quality management personnel will conduct a detailed inspection of the seat bricks, including whether they are eccentric, whether the axis tip is balanced, whether the size meets the requirements of the drawings, etc., and will also pay attention to whether the surface of the seat bricks is smooth and flat.
In addition, we will also check the matching gap and tightness between the upper and lower seat bricks to ensure that they meet the predetermined requirements. This series of inspection processes requires the prefabricated parts team leader and the quality inspector to work closely together to ensure that the quality of each refractory prefabricated part meets the highest standards.
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