Bosch Rexroth has announced the expansion of its EMC-HP electromechanical cylinder series, introducing new sizes 190 and 220 capable of handling heavy-duty applications with forces up to 250 kN. This enhancement caters to a range of industrial processes, including pressing, forming, riveting and testing, where precise and energy-efficient linear movements are essential.
These cylinders are designed to perform dynamic tasks that require high axial forces and precision, including industries such as battery production, wood panel pressing and sheet metal forming. With operational strokes of up to 1,500 mm and protection class IP65, the cylinders are built to withstand harsh working conditions while maintaining optimal performance.
The EMC-HP series uses a proven PLSA planetary screw assembly that allows for dynamic load capacities (Cdyn) reaching 473 kN and a top speed of 0.83 m/s. The spur gear side drive ensures reliable power transmission.
The cylinders have an integrated sensor and display package, which provides real time data about lubrication needs and oil temperature. This information is accessible via IO-Link, enabling operators to maintain optimal performance and efficiency. Additionally, a digital quick selection process allows users to choose an oil bath lubrication option for applications that involve continuous loads.
A simplified commissioning process means that engineers can use the LinSelect online tool to select actuators of various links and mounting configurations. Complete packages include motors, controllers and cables and allow for seamless integration into existing systems. The Smart Function Kit software facilitates easy parameterization of motion tasks, enabling users to configure and order customized cylinders or subsystems directly from the Rexroth shop.
Machine Design had some questions about the EMC-HP cylinder series, so we reached out to Carter Paden, product manager at Bosch Rexroth for some answers.
Editor’s note: Questions and answers may have been edited for clarity and style.
Machine Design: How does the integration of an oil bath lubrication option enhance the longevity and performance of electromechanical cylinders in continuous load applications?
Carter Paden: The oil bath is beneficial to perform continuous lubrication of contact surfaces and but also provides cooling for components that get hot and are subject to wear and tear.
MD: What are the key advantages of using PLSA planetary screw assemblies in high-force applications compared to other drive mechanisms?
CP: PLSAs are very mechanically efficient but can transmit a lot of force. They have a high force-density due to the contact area between the planets and the screws. Compared to a ball screw assembly, they have a higher force-density and, typically, PLSAs have a longer life span, as well.
MD: In what ways does the Smart Function Kit streamline motion task parameterization, and how does it contribute to reducing commissioning time for design engineers?
CP: The Smart Function Kit can speed up commissioning time for engineers because a lot of the individual sizing tasks have already been completed, so the engineers just need to find the right overall size for the application. The parameters of all components are loaded into the software, which engineers normally would have to do manually without the software. It’s a plug-and-play solution where you’re simply plugging in cables, because a lot of the behind-the-scenes setup efforts are already done.
MD: What are the primary considerations when selecting between direct drive and parallel spur gear configurations for heavy-duty applications?
CP: In this instance, the main considerations deal with the space envelope where the actuator needs to be placed. The inline gearbox is similar to the parallel gearbox, so ultimately, it’s a physical space consideration. Ease of access is also an important factor for maintenance concerns.
MD: How does the IP 65 protection class impact the environmental durability of the EMC-HP series, particularly in demanding manufacturing conditions?
CP: Ingress Protection relates to high-precision impact components. If you have dust and debris, that’ll cause wear quickly. The protection will help the actuator have a longer life span, which keeps out contaminants. The EMC-HP series has a removable front seal that contributes to the IP-65 rating. Since they’re removable, if they’re damaged, they can be replaced and removed, so the actuators can continue operating.
