Two-Shot Injection Molded Industrial Caster Assembly

Designed to meet the mobility support needs of AGVs, automated conveyor lines, and mobile robot chassis, this component features a two-shot composite structure with a central hub and an outer overmolded layer. The black core utilizes a five-spoke reinforced rib layout to connect with bearings or shafts, transmitting torque while maintaining structural rigidity. The white outer ring is made of solid elastomer, tightly bonded to the hub via overmolding. This design provides silent operation and shock absorption, effectively protecting floors from hard wear, making it ideal for indoor environments with strict noise control and floor-friendly requirements.

The manufacturing core lies in ensuring the bonding strength at the interface of the inner and outer layers, as well as overall roundness, to prevent debonding, delamination, or rolling runout under long-term load or high-speed operation. Strict control of the coaxiality between the central mounting hole and the outer circle, along with the flatness of the hub end face, is essential to ensure smooth rotation after assembly. For the thick-walled features and complex ribs shown, injection molding processes optimize gate locations and cooling channel designs to suppress shrinkage deformation and ensure dimensional consistency. For large-diameter wheels, dynamic balance performance is also a key quality control indicator.

Leveraging mature expertise in plastic injection molding at our Ningbo facility, equipped with Haitian and Shang恩 brand injection molding machines, we efficiently handle two-shot or overmolding orders for engineering plastics such as PP, PU, Nylon, and thermoplastic elastomers (TPE/TPU). Combined with Coordinate Measuring Machines (CMM) and vision measuring systems, we perform full inspections on wheel diameter tolerances, concentricity, and surface defects, ensuring that the appearance and dimensional precision of bulk deliveries meet European and American standards. Buyers are required to provide 2D/3D drawings specifying material grades, hardness requirements (e.g., Shore A/D), fit tolerances, and load testing standards. We evaluate quotes and lead times based on mold complexity, material costs, and inspection requirements, supporting the full lifecycle from single-piece prototyping to mass production.