The use of pipe-bending machines dates back to the Bronze Age, which also marked the inception of my country's metallurgical and casting technologies. Sophisticated bronze casting techniques existed as early as the Shang Dynasty, yielding various tools such as saws, knives, and files. Ancient oracle bone inscriptions clearly record that these bronze tools—whether for production or daily use—underwent cutting and grinding processes. As living needs evolved, technologies such as carburizing, quenching, and steelmaking were invented, enabling the production of hard, sharp tools. The advent of iron tools signaled a new era in metal cutting and machining.

Bent pipes are ubiquitous in modern industry, finding extensive application in sectors ranging from power infrastructure and home renovation to bridge and shipbuilding. Pipe bending relies primarily on the shaping design of the bending die and the operation of the bending machine; different applications require specific die configurations. While my country's pipe-bending market holds vast potential, rapid technological advancement means that pipe-bending techniques must be continuously updated to maintain a competitive edge. Despite this, current production processes still face numerous challenges. How, then, can the technical difficulties encountered in pipe-bending production be resolved?

Experts from Huameng Machinery note that common pipe materials today include carbon steel, alloy steel, and stainless steel. Domestic pipe-bending technology still requires improvement, as issues frequently arise with various materials—such as deformation or angle deviations after forming. Bending pipes with large radii presents even greater challenges, largely due to a lack of suitable machinery and dies. Experienced industry professionals have proposed technical improvements: before commencing production, manufacturers should conduct repeated tests based on the specific characteristics of each material to identify the optimal die specifications for that material. For large molds, it is advisable to leave extra machining allowance prior to final refinement; this accommodates any deformation that may occur during the casting process, allowing corrections to be made based on the actual deformed state. This approach saves both time and cost—a true win-win solution.