🦾 Robotic picking
Pick-and-place operates in a structured environment with known positions. In contrast, bin-picking manages randomly placed items in an unstructured environment.
Before robotic bin picking, there was pick-and-place. Traditional pick-and-place systems were based on 2D vision systems, where robots followed predefined trajectories. This is a method with a long history in automation.
Pick-and-place
Pick-and-place robots are mechanical arms programmed by software to grab components and place them elsewhere with precision. This technology began in the 1980s and has steadily improved with technological advancements.
Pick-and-place technology relies on software that pre-programs the machine to build a particular product. While these devices are not AI-driven and cannot learn or adjust their processes autonomously, they can be reprogrammed to assemble various types of products. The primary characteristics of pick & place include:
Fixed Trajectories: The robot follows predefined paths to pick and place items.
Known Positions: The locations of the items to be picked and where they will be placed are known and unchanging.
Repetitive Tasks: Often used for repetitive tasks where the same motion is repeated consistently.
Bin picking
Automated bin picking is where AI-controlled machines manipulate a pick-and-place arm to retrieve products from a bin. This technology relies on the integration of robotics and computer vision.
While pick-and-place and bin-picking both involve relocating items, pick-and-place operates in a structured environment with known positions. In contrast, bin-picking manages randomly placed items in an unstructured environment.
The primary characteristics of bin-picking include:
Randomized Item Placement: Items are not in fixed positions and can be oriented in any manner within the bin.
Autonomous Path Planning: The robot must autonomously plan its path to pick up an item without disturbing other items.
Dynamic Environment: The robot must adapt to a constantly changing environment where the positions and orientations of items are variable.
The camera will align the model of the component it was fed and will recognize it in real life. It will calculate the trajectory, optimize the journey, and pick the item from the bin before putting it in its rightful place without damaging the component. Finally, it will keep going until the camera can no longer recognize any more items in the bin.
The machine relies on a 3D camera that scans the container to interpret an image like a human eye so that the robot can grab a particular item from the bin.
It all sounds really simple, but it is, in fact, a feat of modern technology, and for cause: it involves the picking of overlapping complex objects that have an undefined position, and subsequent grasping and placing.
Here are all the difficulties :
Random Order Grasping: Components must often be grasped in a random order.
Object Recognition Failures: Components may not be recognized due to reflections, shininess, or lighting conditions, which depend on the vision sensor technology and the resolution of the 3D map.
Pose Estimation Failures: An item may be recognized, but an inaccurate 3D pose estimation can lead to a failed grasp.
Robot Motion Constraints: Robots have inherent blind spots and areas they avoid to prevent self-damage, like a "survival instinct."
Advantages and Benefits of Bin-picking in the Manufacturing Industry
A bin-picking system can operate without a 3D vision system, especially in simple applications where the items to be picked have a relatively uniform shape and size, and their orientation doesn’t vary significantly. This is also feasible if the environment has consistent lighting and minimal occlusions, and if the robot’s task does not require depth information.
However, in most other cases, a bin-picking system will enhance the ability to locate, position, and orient parts effectively. It often boasts a 3D vision system, and will usually include a robotic arm integrated with the vision system.
That being said, it will still be missing one of the main elements: the end-effector.
Choosing the Right End-Effector for Bin-picking
All robots are sold without the end effector (End-Of-Arm-Tooling), as each mission requires a different one, and most are custom-built for specific tasks.
Without an end effector, a robot is unable to perform any operations.
In the manufacturing industry, there are hundreds of types of end effectors, and numerous companies specialize in making them. End effectors can be sourced from robot manufacturers, third-party component manufacturers, integrators, and specialty shops.
The cost of end effectors varies widely based on their type and complexity. Small pneumatic grippers or suction cup systems can cost a few hundred USD, while more complex or specialized grippers, or large systems, can cost several thousand dollars. High-end systems such as powerful electromagnets, welding systems, or advanced vision systems can reach into the tens of thousands of dollars (USD).
Conclusion
The evolution from traditional pick-and-place systems to advanced bin-picking technologies marks a significant milestone in manufacturing automation. Traditional pick-and-place robots, with their predefined trajectories and known positions, laid the foundation for modern automation. However, the advent of bin picking, driven by the integration of AI, robotics, and computer vision, has revolutionized the industry by enabling robots to operate in unstructured environments with randomly placed items.
The implementation of 3D vision systems and sophisticated end effectors has expanded the capabilities of robotic systems, making them even more adaptable, precise, and efficient. As technology continues to advance, we can expect further innovations in robotic picking systems, driving the future of manufacturing automation forward.