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Higher output and boosted productivity are two of the biggest reasons in justifying the use of automation. Thesegoals can be carried out into injection molding and extrusion automation through Milacron’s proprietary Mosaic + control system, connected and providing the transfer of information back and forth to auxiliary equipment. Milacron provides automation cells that make production faster, robust and more reliable, while reducing the workload for the operator through innovative concepts and project scopes unique to the industry.
The Future of Managing Automation through a Robust Control System
There are numerous opportunities and advantages to setting up a full work cell with specialized jobs for robotics including assembly. In-mold decoration/labeling, dispensing and sealing, machine tending, palletizing and post mold packaging, painting and decorating, insert loading, and part transfer among other tasks that can be achieved. The ability to manage the work cell from a single point location through the Milacron Mosaic + Control provides a reduction of operator setup time, ease of cell operation, and a reduction in the possibility of human error, as robotic programs can be saved with mold files on the Mosaic + Control to ensure that both mold file and robotics program match the process being run at any given time.
"There are numerous opportunities and advantages to setting up a fully automated work cell with specialized application for robotics"
Mosaic + is intelligent and has the capability to implement programming for seamless automation. When a mold is loaded into an injection molding machine, the controllercan recognize it. Milacron will eventually streamline this process to recognize the robots teach pendant and auxiliary equipment settings for the work cell such as dryers, barrel heating bands, mold gate controllers, and more are in development. This process would reduce any potential errors that many have experienced with an operator computing each component manually; but also saves time in configuring and programming each piece every time the mold is removed and replaced for a new part.
For extrusion, much of the actual process is hands on. Unlike injection molding, thermoforming, and other processes, which can easily be automated from raw beginning to finished end, custom extrusion often involves manual touching and forming. However, many trivial and in-line processes for extrusions can be automated, and this is rising within the industry. Services such as embossing, laminating, punching, welding, bar coding, printing, notching, and packaging lend themselves well to automation, allowing these to be offered more and more as value-added services. Automation components and auxiliary equipment added to an extrusion system can increase the size of the machine. Providing an operator’s view and control to every facet of the work cell is more valuable if all the settings are routed through one control system on the operator’s side.
When choosing a robot, the application criteria of the extrusion, injection molding processor parts being produced will influence the reach and payload required of the robot selection. The reach and payload are indicators of robot size, but it is necessary to acknowledge the center of gravity and moment of inertia at different points of robotic movement in and out of a molding machine to validate the exact model required for any specific application. Considering what process forces and torques of the robot arm and how they occur at different points might be required, like insert loading, assembly force or part removal force, along with end of arm tooling movements can all be determining factors in verifying the correct robot model for the job at hand. Cycle time can also be a powerful factor, along with the accuracy and movement requirements of the robotic arm, that is needed for the process operations in your work cell. Machining holes or performing assembly may involve a greater level of accuracy than just picking a part out of a mold. Robot selection is a key step for success of the system, so requesting help of a robotics system design expert can help to ensure that the robot chosen is optimally designed for your specific needs.
After the robot selection and reach verification, the end-of-arm tooling should be evaluated. Determine how the part can be held—with either a vacuum or mechanical gripper, or a combination of both. In addition, sprues may need to be gripped and set in a granulator opening, a separate tray or simply dropped into a bin within the work cell. A significant factor in end-of-arm tooling is depends upon your mold and the complexity of the part, the part location in the mold, cavitation of the parts being produced, how the parts are ejected, the geometry of the parts, core sequences and inserts for loading into the part prior to molding are all details needed to verify end of arm tooling is optimally designed for your application.
If placing inserts in the mold to be over molded in the body of the part, the method of insert evaluation and decision on whether to automatically or manually feed the inserts, to an insert loading fixture for presentation to the robot is important for understanding cell design,overall floor space requirements and cycle time of the cell. Proper feeding of the inserts can dramatically reduce cycle time of the cell operation. By analyzing how inserts will be picked by the robot and placed into the mold either A Side or B Side, and determining which side of the mold finished parts are to be picked from, then end of arm tooling decisions on gripper circuits, types of grippers and vacuum cups can be designed to automate applications within the machine work cell that may have been solely manual operations previously.
Operator Engagementand Safety
As injection molding and extrusion work cells grow larger, so do the safety issues associated with running them. While virtually all plastic manufacturers follow the appropriate safety regulations in the design and development of the machinery, including shielding, guarding, safety shutoffs and “lock out – tag out” (LOTO) protocols, many are omitting some additional needs that come from high base or even larger tonnage machines.
Cell safety is a consideration that should be prominent through the entire design process. Important considerations are fencing to protect operators from the robotic system, along with placement of hard stops, which prohibit the robot from traveling outside of the allocated area.
Measure and Innovate with IoT
Whether you’re injecting or extruding your part, up and downstream equipment are critical to your operation. With M-Powered, the need for multiple monitoring systems is eliminated. On a modern machine, all aspects of the machine’s operation that are significant to product quality can behandled by the machine’s controller or through a common interface.
Connecting your workcell to Milacron’s M-Powered suite makes monitoring complete production quality simple. M-Powered is able to collect data from multiple sources to create a complete overview of workcellKPI’sprovide the tools necessary to monitor, perform long term analysis, and alert to any unique combination of parameters. By gathering the workcellsetpoints into “recipes” and reviewing the actual values against dynamic limits, an online quality solution provides sophisticated learning algorithms that distinguish the best recipes and assist with process optimization.
As new emerging technologies are developed, Milacron will continue to grow our service offerings with the best in new equipment, practices, and techniques, without hesitating to modify or change with emerging technologies that promise to enhance these processes and bring the best to our customers.