Deformation in the casting process is primarily caused by two main factors. First, the wax pattern itself may be deformed. Since the cylinder and the body of the spring cover are molded separately and then manually bonded together, poor bonding can lead to misalignment or tilting of the cylinder. This issue can be significantly reduced through better on-site operational management. The second cause occurs during solidification and cooling. As the casting cools from its solidification temperature down to room temperature, shrinkage is restricted, leading to shrinkage stress. If the structure lacks sufficient rigidity, especially in areas with high shrinkage potential such as the intermediate cylinder, deformation can occur. Additionally, excessively high casting temperatures or premature shell formation may also contribute to this problem. To address shrinkage issues, a number of methods can be applied, such as using risers, cold iron, or adding extra material (also known as "meat adding"). In this case, a dark riser could be used for shrinkage compensation; however, it is not practical in investment casting due to the hot shell casting process. Cold iron cannot be used to increase the wall thickness, so the casting must be designed to solidify sequentially by increasing local wall thickness. However, this changes the original structure and requires machining to reach the desired dimensions. For deep cavities like that of the spring cover, machining becomes difficult and costly, making this approach less favorable. The four corners of the spring cover are thick sections where isolated hot spots form, making it challenging for molten metal to flow smoothly. High pouring temperatures or impurities in the molten steel can further worsen this situation, leading to shrinkage and porosity. To solve these problems, reinforcing ribs were introduced. These ribs help control deformation while also acting as local feeders to reduce shrinkage. The size of each rib is determined based on the wall thickness at the joint. After calculations, four small round reinforcing ribs were decided upon to fill the four corners of the spring cover. During the trial production phase, strict process control was implemented to minimize human errors. After cleaning, no surface shrinkage was observed. Radiographic testing showed only minor porosity in some samples, which met the required pass rate. The cutting of the reinforcing ribs from the middle revealed clear signs of shrinkage, confirming their effectiveness in feeding the casting. Further trials with multiple batches confirmed the process's reliability, maintaining a high yield rate. By cleverly using reinforcing ribs, this method effectively solved both deformation and shrinkage issues in the spring cover, achieving excellent results in the casting process. cold storage door for food; Freezer door where medicine is stored; Low-temperature resistant cold storage door Shenzhen Yue Ma intelligent Technol , https://www.ymcleanroomdoor.com