Multi-press Tandem Linear Transfer Robots for Medium-to-Large Sheet Metal Parts Stamping Automation Solution

In industries such as home appliances, 3C, and telecommunications, many medium-to-large sheet metal parts are produced in large batches and have relatively regular shapes. Their stamping production requires multiple presses in tandem. How to transfer workpieces between presses quickly and reliably is the key to such a line. The multi-press tandem linear transfer robot is an automation solution designed specifically for these scenarios, using linear transfer robots to pick and place parts between two presses and automating loading and unloading across the entire line.

The basic composition of this solution is as follows: multiple presses are arranged in a line according to the process sequence, with each press handling one operation. Between every two presses, a linear transfer robot handles loading and unloading transfer. Feeding equipment is provided at the front end, and collection equipment at the back end. The entire line runs fully automatically from sheet loading to finished part collection.

The role of the linear transfer robot in this solution is that of a "material handler" between two presses. Its motion is mainly forward/backward and up/down within a plane, with a relatively simple structure: after the previous press completes its stroke, the linear transfer robot reaches into the die to remove the workpiece, transfers it laterally to the next press, places it in position, and exits the die area. The next press then begins its stroke. Pick, transfer, place—cycle after cycle, the entire line runs continuously.

Why are linear transfer robots used for this type of production line? Because medium-to-large sheet metal parts have relatively regular shapes and large batch sizes, and high transfer speed is required. Linear transfer robots have a simple structure, few moving parts, low inertia, and fast acceleration/deceleration. Their greatest feature is high transfer speed. For sheet metal parts that do not require complex flipping, the linear transfer robot picks and delivers—clean and efficient—achieving very high cycle rates. For high-volume sheet metal production, speed translates directly into capacity, and the linear transfer robot's speed advantage becomes a capacity advantage.

Besides speed, linear transfer robots offer several other advantages. First, reliability: fewer motion axes and fewer transmission components mean a low failure rate and easy maintenance—ordinary maintenance technicians can service them, ensuring long-term continuous operation of the line. Second, precise positioning: servo motor drive combined with high-precision linear guide rails and encoder feedback provides high repeat positioning accuracy, so every part is placed in the same position, ensuring stable stamping quality. Third, compact layout: the linear transfer robot is installed between two presses, occupying little space and making the entire line more compact. Fourth, simple operation: touchscreen control with intuitive parameter settings allows workers to get up to speed quickly.

When planning the solution, several key points must be well controlled. First, load matching: the linear transfer robot's load is calculated based on the workpiece weight plus the gripper weight, with a safety margin. Second, stroke matching: the stroke must cover the distance between two presses plus the up/down stroke required for picking and placing parts. Third, cycle time matching: calculate the required overall line cycle time based on target capacity, then work backward to determine each robot's transfer time, and have the manufacturer perform a cycle time simulation to confirm. Fourth, gripper design: use vacuum suction cups for flat parts, with the number and position of suction cups designed according to the workpiece shape; a quick-change structure is best for easy product changeover.

After automation, the most obvious change on this line is fewer workers. Previously, with multiple presses in tandem, one worker was needed between every two presses for loading and unloading, requiring quite a few people per line. With linear transfer robots, the entire line can be operated by one or two people. Workers no longer need to carry material back and forth between two presses, greatly reducing physical labor. Efficiency is up, quality is stable, and safety is ensured—this is a highly reliable solution for stamping automation of medium-to-large sheet metal parts.

Guangdong RuiHui Intelligent Technology Co., Ltd. has been deeply engaged in the field of stamping automation for over twenty years. It is a national "Specialized and Sophisticated" "Little Giant" enterprise, headquartered in Dongguan, with more than 400 employees and over 80 R&D personnel. RuiHui's multi-press tandem linear transfer robot stamping lines are widely used in the home appliance, 3C, telecommunications, and other industries. The linear transfer robots use servo drive and high-precision linear guide rails, offering a wide load range, high operating speed, and high positioning accuracy. Stroke and gripper can be customized according to the customer's press spacing and workpiece dimensions, with complete line integration from feeding to collection. RuiHui has supplied multi-press tandem stamping automation lines to numerous home appliance, 3C, and telecommunications enterprises. With nearly 5,000 sets of equipment operating at customer sites both domestically and internationally, serving well-known OEMs and first-tier suppliers such as BYD, Geely, Volkswagen, Tesla, BMW, Mercedes-Benz, Honda, and Land Rover Jaguar, RuiHui has rich practical experience.