Hilchenbach, July 12, 2018

Fast modernization of a gear unit

Over the past few years, SMS group, together with its customer SSAB in Raahe, Finland, has made strong efforts in the fields of improving quality, increasing production and minimizing costs.

A key success factor of the good cooperation with SSAB is continuously implemented concept engineering. This was applied also to SSAB’s gear units when preparing them for future required performance. During the last downtime in November 2017, SMS group replaced main gear unit F1 and mill pinion gear unit F3, including pertaining couplings and intermediate shafts. The results of the previously conducted concept engineering were implemented at the plant in parallel. SMS group completely revamped the first three mill stands and partly equipped them with new components. Thanks to perfect preparation and close cooperation with the customer, it was possible to substantially shorten the given downtimes.

All components were manufactured in the Hilchenbach workshop of SMS group in compliance with extremely high quality standards. The over 100-ton reduction gear unit is one of the heaviest, single-stage reduction gear units ever made by SMS group. This gear unit had to be designed to exactly fit in the former place. Unfortunately, local conditions did not permit the gear unit to be installed the usual way by means of bay crane. Despite the additional effort for transportation, positioning and alignment, it was possible to manage installation ahead of schedule.

Mill pinion gear unit in advanced gear design

The mill pinion gear unit in advanced gear design is a cutting-edge mill pinion gear unit able to transmit substantially higher torques at the same overall size. Using the same space and existing anchor bolts, this gear unit offers the customer a longer lifetime and more safety for the new drive elements.