How does one-piece stamping ensure that flat baking sheets maintain their structural integrity during repeated high-temperature baking?
Publish Time: 2026-01-19
In modern kitchens and the food industry, flat baking sheets are frequently used baking tools, and their performance directly affects cooking efficiency, product quality, and even food safety. Faced with repeated high-temperature baking environments often exceeding 200°C, ordinary welded or pieced baking pans are prone to warping, cracking, or weld failure due to uneven thermal stress. Flat baking sheets manufactured using one-piece stamping technology, with their seamless overall structure, precise control of material properties, and precision forming technology, successfully solve the problem of high-temperature deformation, becoming a representative of high-performance cooking appliances.1. One-piece structure eliminates stress concentration sourcesTraditional multi-piece welded baking pans, under high temperatures, easily become stress concentration points in the weld area due to differences in the thermal expansion coefficients of the materials and changes in microstructure, leading to cracking or localized bulging. One-piece stamping, by pressing a single sheet of high thermal conductivity metal into shape under a large hydraulic press, completely avoids secondary processing such as welding, riveting, or bonding. The entire baking pan features a continuous metal structure from bottom to edge, with internal grains extending orderly along the stamping direction, forming a uniform and dense mechanical network. This "uninterrupted" design allows for even distribution of thermal expansion across the entire pan, significantly reducing the risk of localized deformation and maintaining excellent flatness even after hundreds of heating and cooling cycles.2. Material Selection and Thickness Optimization for Deformation ResistanceOne-piece stamped baking pans typically use metal materials with high thermal conductivity and moderate heat capacity. This allows for rapid and even distribution of oven heat across the entire surface, reducing localized overheating. Aluminum-plated carbon steel maintains good thermal conductivity while the aluminum layer enhances oxidation and corrosion resistance. More importantly, the stamping process allows for differentiated thickness designs in different areas—the bottom remains thicker to enhance rigidity, while the edges are moderately thinned and rolled for reinforcement, reducing weight while increasing bending strength. This "on-demand" material layout significantly improves structural stability without increasing overall weight.3. Precision Dies and Springback Compensation Ensure Geometric AccuracyStamping is not simply pressing; it involves complex plastic deformation and elastic recovery. To ensure the baking pan remains flat after high-temperature use, manufacturers incorporate CAE simulation analysis during the die design phase to accurately predict the material's springback after stamping and pre-compensate in the die cavity. For example, if the simulation shows the pan surface will slightly arch upwards by 0.3mm after cooling, the die will be designed with a slightly concave curved surface, ensuring the final product presents an ideal flat surface at room temperature. Furthermore, high-precision stamping equipment combined with multi-station progressive dies can control flatness tolerances within ±0.1mm, providing ample safety margin for subsequent high-temperature use.4. Heat Treatment and Surface Finish Further Stabilize PerformanceSome high-end baking pans undergo stress-relief annealing after stamping. This releases residual internal stress through low-temperature heating, preventing "aging deformation" during initial high-temperature use. Meanwhile, surface treatments such as anodizing or ceramic non-stick coatings not only enhance functionality but also form a dense protective layer, reducing long-term erosion of the substrate structure by oxidation and indirectly extending its lifespan against deformation.The reason why one-piece stamping ensures that the flat baking sheet does not deform during repeated high-temperature baking lies in its integration of materials, structure, and process: the seamless integrity eliminates weak points, the reasonable thickness distribution enhances rigidity, precise mold compensation controls geometric accuracy, and subsequent heat treatment locks in stability. This design concept of "eliminating the possibility of deformation from the source" not only meets the durability expectations of home users but also aligns with the stringent requirements of efficiency and consistency in commercial baking, truly achieving a high-quality cooking experience of "stable shape, even heating, and long service life."
