The manufacturing process for forged wheels involves using high pressure to plastically deform the metal, resulting in a dense molecular structure that yields high strength and lightweight characteristics.
Key Manufacturing Steps
The process steps primarily include material feeding and cutting, aluminum billet preheating, forging, flow forming, heat treatment, machining, and surface treatment. For feeding and cutting, 6061 aluminum billets are selected and cut to the dimensions required for the wheel. Preheating involves placing the billet in a furnace to reach a set temperature prior to forging. Forging involves using a press with a capacity exceeding 8,000 tons to directly forge the blank. Flow forming utilizes a vertical flow-forming machine to apply intense pressure to the blank. Heat treatment comprises high-temperature solution treatment, water quenching, and low-temperature aging. Machining involves using a lathe to create the designed shape and drilling features such as the center bore and bolt holes. Surface treatment includes precision turning, polishing, and coating.
Classification of Forming Processes
Forged wheel forming processes are primarily categorized into direct forging, precision forging (or shape forging), and forge-milling. Precision forging is suitable for the mass production of simple designs, whereas forge-milling is suited for small-batch production (such as aftermarket modifications) or custom, single-set orders. Based on forging temperature, processes can also be classified as cold pressing or hot pressing. Cold pressing involves using a press on metal at room temperature, while hot pressing involves heating the material to a specific temperature before forging. Hot pressing is more commonly used because heating the metal to a red-hot state increases its ductility, making it easier to forge into shape.
Key Production Equipment
Key equipment includes 10,000-ton class forging presses, hole-expansion presses, flow-forming machines, CNC machining centers, and MC (Machining Center) units. For instance, production lines utilize 10,000-ton forging presses and 800-ton hole-expansion presses.
Process Precision and Quality Control
High-end forged wheel production demands strict precision; inspections using Coordinate Measuring Machines (CMM) allow machining errors to be controlled within 0.03 millimeters.
