Key Selection Points for Transfer Manipulators Matching Guidelines for Payload Stroke and Speed

Transfer manipulators serve as material handlers between presses on tandem stamping lines composed of multiple presses in series. Proper selection directly determines the takt time and stability of the entire production line. Payload, stroke and speed are three core parameters. Reasonable matching ensures reliable equipment operation. The key matching points are elaborated below.

For payload matching, the payload capacity shall be calculated based on the total weight of workpieces plus grippers with a safety margin reserved. During high‑speed movement, inertial force acting on workpieces exceeds static weight. Sufficient payload margin guarantees stable operation. Insufficient payload causes vibration and positioning errors during high‑speed running, and may even damage mechanical structures. Inform suppliers of your workpiece weight range for proper payload‑grade selection.

For stroke matching, the manipulator stroke must cover the distance between two presses plus the movement range required for part picking and placing. The forward‑backward stroke shall enable access into dies for picking and full retraction for placing. The vertical stroke shall accommodate height variation for pick‑and‑place actions. Insufficient stroke leads to failure to reach workpieces inside dies or mis‑placement of parts, which may require modification of the whole‑line station layout. Provide press‑to‑press distance and die position data for suppliers to calculate suitable stroke configurations.

For speed matching, manipulator speed determines line takt performance. High‑takt requirements demand outstanding running speed as well as acceleration‑deceleration capability to avoid press idle waiting for materials. Featuring simple structures and low moving‑part inertia, transfer manipulators deliver excellent acceleration‑deceleration performance and remarkable speed advantages. However, excessive speed may cause workpiece swinging. Suppliers shall conduct takt simulation to verify stable pick‑and‑place cycles under target production takt.

Besides payload, stroke and speed, other factors should be considered. Positioning accuracy ensures consistent part‑placing positions and product quality. For gripper design, vacuum suction cups are adopted for flat parts; quantity and layout of suction cups are customized according to workpiece geometry. Quick‑change structures are recommended for fast product changeover. User‑friendly control systems with touch‑screens support intuitive parameter setup for easy operator training.

Attention should also be paid to auxiliary configurations. Signal docking and safety interlocks between manipulators and presses must be compatible. Takt coordination shall be achieved between manipulators and upstream‑downstream feeding/unloading equipment. Supplier service capacity including installation & commissioning, after‑sales support and spare‑parts supply shall be evaluated.

In essence, transfer manipulator selection means matching payload, stroke and speed to your workpieces and production lines. Clarify workpiece weight, press spacing and target takt, and fully communicate with experienced suppliers for customized proposals. Proper parameter matching guarantees the takt performance and stability of the complete line.

Guangdong Ruihui Intelligent Technology Co., Ltd. has over 20‑year experience in stamping automation and is a national Specialized, Refined, Differential and Innovative “Little Giant” enterprise. Headquartered in Dongguan, it employs more than 400 staff including over 80 R&D engineers. Ruihui transfer manipulators adopt servo drive and high‑precision linear guideways, featuring wide payload range, high running speed and superior positioning accuracy. Strokes can be customized according to customer press spacing and workpiece dimensions. Custom‑designed quick‑change grippers, together with well‑developed signal connection and safety interlocks with presses, make them widely applied in tandem stamping lines. Nearly 5,000 sets of Ruihui‑manufactured equipment are operating for domestic and overseas clients. The company serves well‑known OEMs and Tier‑one suppliers such as BYD, Geely, Volkswagen, Tesla, BMW, Mercedes‑Benz, Honda and Jaguar Land Rover, with rich practical experience in multi‑press tandem lines.