Mitsubishi Heavy Industries Machine Tool, Demonstration Experiment of Wireless in Factory Using 5G

NEC, together with Mitsubishi Heavy Industries Machine Tool, NTT DoCoMo, Sanritsu Automation, and Kozo Keikaku Kenkyusho, will conduct a demonstration experiment at the Mitsubishi Heavy Industries Machine Tool Ritto Factory for wireless communication in the factory using the 5th generation mobile communication system (5G). Was carried out. The implementation period is one month from January to February 2021. The demonstration was conducted under the three themes of “wireless control network that contributes to variable and variable production,” “remote control of trackless AGVs,” and “remote maintenance work support for efficient equipment for field workers.” ..

5G wireless evaluation equipment for control network In the wireless control network, Ethernet / IP and CC-Link IE are targeted as industrial Ethernet used in the control network of the factory, and communication using the 5G wireless network is performed. Evaluation was carried out. By optimizing the settings of 5G base stations and measuring fixed-cycle communication (cyclic communication) peculiar to industrial Ethernet, delay and stop are suppressed to less than 0.1 seconds, and it is verified that stable communication for a long time is possible. did.

Trackless AGV system configuration

Base station wireless unit installed in the factory

Trackless AGV For remote control of trackless AGV, a trackless AGV system equipped with a surveillance camera was operated in a factory with many metal shields. In this state, it was confirmed that communication with a throughput (communication speed) assuming high-definition image transmission of 10 Mbps or more at all times and communication with AGV control signals can be performed simultaneously without interruption. We also verified that by controlling with the NEC multi-robot controller while remotely monitoring with the surveillance camera mounted on the AGV, it is possible to work remotely while grasping the surrounding environment. While 5G has a wider communication area than wireless LAN, it may be difficult for radio waves to reach the edge of the 5G communication area due to the effects of shielding in factories, etc., so an additional wireless LAN device was installed. As a result, it was confirmed that NEC’s network virtualization technology could be used to switch to the optimum communication path (wireless LAN) according to the situation without interruption, and that operation could be performed without stopping control.

Remote maintenance work support system configuration

Remote maintenance work support

State of excavation by metal processing equipment (remote vibration data collection) In the verification of remote maintenance work support, a system that remotely supports maintenance work of production equipment using video transmission by 5G is on the cloud platform service “NEC Cloud IaaS”. Built in. After that, the on-site video was shared remotely, and the effectiveness of providing information to field workers using smart glasses and providing information on equipment status to remote maintenance workers using a web application was verified. At the same time, by collecting vibration data by 5G, analyzing data by artificial intelligence (AI), and providing feedback to the site in real time, we built a mechanism to understand the wear status of tools during excavation even if a skilled worker is not at the site. As a result, it was confirmed that a dynamic radio wave map can be generated in the factory by collecting information on the radio wave environment in the cloud. In addition, we were able to grasp the wireless status due to factors peculiar to the factory and collect a lot of knowledge for making the factory wireless.