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Case Study: Extending the life of gear unit

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The bearings, monitoring system or oil system have, of course, been upgraded constantly over the years to remain state-of-the-art. However, the basic principle of the current CPU gears is still based on the original 1966 design. Martin Baechler details the overhaul process of one such two-stage planet gear unit that was recently carried out at Orient Cement.

The first two-stage planet gear unit for the cement industry was developed in 1966 by MAAG ZahnrSder AG (now FLSmidth MAAG Gear) in Zurich, Switzerland. These gear units of type CPU consist of two series-connected planet stages, each with 3 planets and a rotating planet carrier. They replaced traditional, multistage, spur gear units for the central drive of ball mills. Thanks to their higher power density and better efficiency, these gear units are able to transfer more power and take up less space.

This design is very robust and durable. It is proved by the fact that the first two units built in 1967 are still in use in Belgium after over 46 years of operation. More than just periodic inspection and maintenance work is required if a gear unit is to be operated far beyond its normal service life under the tough environmental and operating conditions in the cement industry. The service life can only be extended if the entire gear unit is completely overhauled. Overhauls reduce the overall wear in the gear unit. The wear parts are replaced and the gear unit is serviced so that it is ready for the next operating period. If overhauls are planned in advance, they can be carried out in periods of low demand and also ensure that the gear unit continues to operate without problems. They help reduce maintenance costs, extend the service life of the plant and contribute to avoiding unexpected downtime. Orient Cement in India recently benefited from all of these advantages.

Orient Cement, a far-sighted cement producer

Orient Cement was founded in 1979. It has operated a cement factory in Devapur, in Adilabad district in central India since 1982, and a split-grinding unit in Jalgaon, Maharashtra, since 1997. Orient Cement pursues a clear growth strategy. Between 1990 and 2009, total production capacity was continuously increased to 5 million tonnes of cement a year by upgrading the existing cement lines and adding a new line. To achieve the target of 15 million tonnes a year by 2020, Orient Cements focus is not only on the construction of new production sites. It is equally important to secure the existing production capacity. This requires the maintenance of the existing systems. Only high-quality, well-maintained production plants are able to produce the desired quality and quantity of cement reliably and with optimum efficiency. For this reason, Orient Cement recently had the gear unit of a raw meal mill completely overhauled.

The gear unit, of type CPU-30-2, was designed and produced in 1987 by FLSmidth MAAG Gear in Switzerland. The design differs from the standard CPU series because at that time motors with the required output of 3800 kW were not available. A drive with two parallel motors, each with an output of 1900 kW, was developed for Orient Cement. As its first reduction, this CPU does not have a planet stage. It has two input pinions that mesh with a common gearwheel. The accumulated power is transferred to the second stage, a planetary gear with rotating planet carrier, via a gear coupling. The input speed of 992 RPM is reduced to the mill speed of 14.76 RPM in the two gear stages.

Complete overhaul of a two-stage central drive

After first operation, the gear unit was inspected during the warranty period after 6,000 and 12,000 operating hours. It then ran for more than 10 years without problems, maintained by the local maintenance team. The first major inspection by FLSmidth MAAG Gear took place in 2005 and the gear unit was found to be in good condition.

As recommended by FLSmidth MAAG Gear, a complete overhaul was carried out in September 2013 after approximately 134,000 operating hours or a service life of 26 years. Roughly six months beforehand, a service engineer from FLSmidth MAAG Gear produced an initial analysis of the gear unit on site and established that all necessary spare parts for the overhaul were available locally.

When the service engineers arrived in Devapur, the gear unit had already been prepared for the overhaul. The raw mill was stopped and the auxiliary drives and the power supply of the main motors had been removed by Orient Cement employees. The overhaul work was completed in just 10 days. The oil pipes and connection couplings had to be removed first to allow the gearing and the bearings of the two gear stages to be inspected. The three planet axles in the second stage also serve as journals and are therefore coated with a layer of white metal. As part of this overhaul, Orient Cement inspected the journals using ultrasound to ensure that the white metal layer was still in perfect condition. The gearing of the sun pinion of the second stage was also inspected using ultrasound as it is the gearing subject to the highest load in the gear. All sliding bearings in both gear stages were completely replaced. The gear unit was also cleaned and small parts and wearing parts were replaced. When the gear stages were assembled, the internal alignment of the gearwheels and the tooth contacts were reset.

The gear unit was completely assembled in the last 3 days of the mills downtime. The service engineers first assembled the two gear stages again and set the tooth contact and backlash correctly. The gear unit was provisionally aligned and braced on the foundation. Wearing parts such as O-rings and coupling bolts in the output coupling were replaced before the coupling was installed. The cleaned and inspected couplings were filled with new lubricating grease and the alignment between the motors, the gear unit and the mill was restored. The oil pipes were then connected and flushed with the oil. The rotational direction test on the motors was the last job before the load test and the resumption of operation of the raw meal mill.

Conclusion

After this 10-day complete overhaul, the Orient Cement gear unit has new bearings, all the wearing parts have been replaced and the alignment of the gearing has been restored to the original setpoint. The alignment with the drive motors and the mill has also been checked and is in the permissible range. The gear unit is not new but it is fit for the next stage of its life. With good care and the necessary maintenance, it will continue to operate well until the next complete overhaul is due after 80,000 hrs or 12 years.

Concrete

Technology plays a critical role in achieving our goals

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Arasu Shanmugam, Director and CEO-India, IFGL, discusses the diversification of the refractory sector into the cement industry with sustainable and innovative solutions, including green refractories and advanced technologies like shotcrete.

Tell us about your company, it being India’s first refractory all Indian MNC.
IFGL Refractories has traditionally focused on the steel industry. However, as part of our diversification strategy, we decided to expand into the cement sector a year ago, offering a comprehensive range of solutions. These solutions cover the entire process, from the preheater stage to the cooler. On the product side, we provide a full range, including alumina bricks, monolithics, castables, and basic refractories.
In a remarkably short span of time, we have built the capability to offer complete solutions to the cement industry using our own products. Although the cement segment is new for IFGL, the team handling this business vertical has 30 years of experience in the cement industry. This expertise has been instrumental in establishing a brand-new greenfield project for alumina bricks, which is now operational. Since production began in May, we are fully booked for the next six months, with orders extending until May 2025. This demonstrates the credibility we have quickly established, driven by our team’s experience and the company’s agility, which has been a core strength for us in the steel industry and will now benefit our cement initiatives.
As a 100 per cent Indian-owned multinational company, IFGL stands out in the refractory sector, where most leading players providing cement solutions are foreign-owned. We are listed on the stock exchange and have a global footprint, including plants in the United Kingdom, where we are the largest refractory producer, thanks to our operations with Sheffield Refractories and Monocon. Additionally, we have a plant in the United States that produces state-of-the-art black refractories for critical steel applications, a plant in Germany providing filtering solutions for the foundry sector, and a base in China, ensuring secure access to high-quality raw materials.
China, as a major source of pure raw materials for refractories, is critical to the global supply chain. We have strategically developed our own base there, ensuring both raw material security and technological advancements. For instance, Sheffield Refractories is a leader in cutting-edge shotcreting technology, which is particularly relevant to the cement industry. Since downtime in cement plants incurs costs far greater than refractory expenses, this technology, which enables rapid repairs and quicker return to production, is a game-changer. Leading cement manufacturers in the country have already expressed significant interest in this service, which we plan to launch in March 2025.
With this strong foundation, we are entering the cement industry with confidence and a commitment to delivering innovative and efficient solutions.
Could you share any differences you’ve observed in business operations between regions like Europe, India, and China? How do their functionalities and approaches vary?
When it comes to business functionality, Europe is unfortunately a shrinking market. There is a noticeable lack of enthusiasm, and companies there often face challenges in forming partnerships with vendors. In contrast, India presents an evolving scenario where close partnerships with vendors have become a key trend. About 15 years ago, refractory suppliers were viewed merely as vendors supplying commodities. Today, however, they are integral to the customer’s value creation chain.
We now have a deep understanding of our customers’ process variations and advancements. This integration allows us to align our refractory solutions with their evolving processes, strengthening our role as a value chain partner. This collaborative approach is a major differentiator, and I don’t see it happening anywhere else on the same scale. Additionally, India is the only region globally experiencing significant growth. As a result, international players are increasingly looking at India as a potential market for expansion. Given this, we take pride in being an Indian company for over four decades and aim to contribute to making Aatma Nirbhar Bharat (self-reliant India) a reality.
Moving on to the net-zero mission, it’s crucial to discuss our contributions to sustainability in the cement industry. Traditionally, we focused on providing burnt bricks, which require significant fuel consumption during firing and result in higher greenhouse gas emissions, particularly CO2. With the introduction of Sheffield Refractories’ green technology, we are now promoting the use of green refractories in cement production. Increasing the share of green refractories naturally reduces CO2 emissions per ton of clinker produced.
Our honourable Prime Minister has set the goal of achieving net-zero emissions by 2070. We are committed to being key enablers of this vision by expanding the use of green refractories and providing sustainable solutions to the cement industry, reducing reliance on burnt refractories.

Technology is advancing rapidly. What role does it play in helping you achieve your targets and support the cement industry?
Technology plays a critical role in achieving our goals and supporting the cement industry. As I mentioned earlier, the reduction in specific refractory consumption is driven by two key factors: refining customer processes and enhancing refractory quality. By working closely as partners with our customers, we gain a deeper understanding of their evolving needs, enabling us to continuously innovate. For example, in November 2022, we established a state-of-the-art research centre in India for IFGL, something we didn’t have before.
The primary objective of this centre is to leverage in-house technology to enhance the utilisation of recycled materials in manufacturing our products. By increasing the proportion of recycled materials, we reduce the depletion of natural resources and greenhouse gas emissions. In essence, our focus is on developing sustainable, green refractories while promoting circularity in our business processes. This multi-faceted approach ensures we contribute to environmental sustainability while meeting the industry’s demands.

Of course, this all sounds promising, but there must be challenges you’re facing along the way. Could you elaborate on those?
One challenge we face is related to India’s mineral resources. For instance, there are oxide deposits in the Saurashtra region of Gujarat, but unfortunately, they contain a higher percentage of impurities. On the magnesite side, India has deposits in three regions: Salem in Tamil Nadu, Almora in Uttarakhand, and Jammu. However, these magnesite deposits also have impurities. We believe the government should take up research and development initiatives to beneficiate these minerals, which are abundantly available in India, and make them suitable for producing high-end refractories. This task is beyond the capacity of an individual refractories company and requires focused policy intervention. While the government is undertaking several initiatives, beneficiation of minerals like Indian magnesite and Indian oxide needs to become a key area of focus.
Another crucial policy support we require is recognising the importance of refractories in industrial production. The reality is that without refractories, not even a single kilogram of steel or cement can be produced. Despite this, refractories are not included in the list of core industries. We urge the government to designate refractories as a core industry, which would ensure dedicated focus, including R&D allocations for initiatives like raw material beneficiation. At IFGL, we are taking proactive steps to address some of these challenges. For instance, we own Sheffield Refractories, a global leader in shotcrete technology. We are bringing this technology to India, with implementation planned from March onwards. Additionally, our partnership with Marvel Refractories in China enables us to leverage their expertise in providing high-quality refractories for steel and cement industries worldwide.
While we are making significant efforts at our level, policy support from the government—such as recognising refractories as a core industry and fostering research for local raw material beneficiation—would accelerate progress. This combined effort would greatly enhance India’s capability to produce high-end refractories and meet the growing demands of critical industries.

Could you share your opinion on the journey toward achieving net-zero emissions? How do you envision this journey unfolding?
The journey toward net zero is progressing steadily. For instance, even at this conference, we can observe the commitment as a country toward this goal. Achieving net zero involves having a clear starting point, a defined objective, and a pace to progress. I believe we are already moving at an impressive speed toward realising this goal. One example is the significant reduction in energy consumption per ton of clinker, which has halved over the past 7–8 years—a remarkable achievement.
Another critical aspect is the emphasis on circularity in the cement industry. The use of gypsum, which is a byproduct of the fertiliser and chemical industries, as well as fly ash generated by the power industry, has been effectively incorporated into cement production. Additionally, a recent advancement involves the use of calcined clay as an active component in cement. I am particularly encouraged by discussions around incorporating 12 per cent to 15 per cent limestone into the mix without the need for burning, which does not compromise the quality of the final product. These strategies demonstrate the cement industry’s constructive and innovative approach toward achieving net-zero emissions. The pace at which these advancements are being adopted is highly encouraging, and I believe we are on a fast track to reaching this critical milestone.

– Kanika Mathur

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ARAPL Reports 175% EBITDA Growth, Expands Global Robotics Footprint

Affordable Robotic & Automation posts strong Q2 and H1 FY26 results driven by innovation and overseas orders

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Affordable Robotic & Automation Limited (ARAPL), India’s first listed robotics firm and a pioneer in industrial automation and smart robotic solutions, has reported robust financial results for the second quarter and half year ended September 30, 2025.
The company achieved a 175 per cent year-on-year rise in standalone EBITDA and strong revenue growth across its automation and robotics segments. The Board of Directors approved the unaudited financial results on October 10, 2025.

Key Highlights – Q2 FY2026
• Strong momentum across core automation and robotics divisions
• Secured the first order for the Atlas AC2000, an autonomous truck loading and unloading forklift, from a leading US logistics player
• Rebranded its RaaS product line as Humro (Human + Robot), symbolising collaborative automation between people and machines
• Expanded its Humro range in global warehouse automation markets
• Continued investment in deep-tech innovations, including AI-based route optimisation, autonomy kits, vehicle controllers, and digital twins
Global Milestone: First Atlas AC2000 Order in the US

ARAPL’s US-based subsidiary, ARAPL RaaS (Humro), received its first order for the next-generation Atlas AC2000 autonomous forklift from a leading logistics company. Following successful prototype trials, the client placed an order for two robots valued at Rs 36 million under a three-year lease. The project opens opportunities for scaling up to 15–16 robots per site across 15 US warehouses within two years.
The product addresses an untapped market of 10 million loading docks across 21,000 warehouses in the US, positioning ARAPL for exponential growth.

Financial Performance – Q2 FY2026 (Standalone)
Net Revenue: Rs 25.7587 million, up 37 per cent quarter-on-quarter
EBITDA: Rs 5.9632 million, up 396 per cent QoQ
Profit Before Tax: Rs 4.3808 million, compared to a Rs 360.46 lakh loss in Q1
Profit After Tax: Rs 4.1854 lakh, representing 216 per cent QoQ growth
On a half-year basis, ARAPL reported a 175 per cent rise in EBITDA and returned to profitability with Rs 58.08 lakh PAT, highlighting strong operational efficiency and improved contribution from core businesses.
Consolidated Performance – Q2 FY2026
Net Revenue: Rs 29.566 million, up 57% QoQ
EBITDA: Rs 6.2608 million, up 418 per cent QoQ
Profit After Tax: Rs 4.5672 million, marking a 224 per cent QoQ improvement

Milind Padole, Managing Director, ARAPL said, “Our Q2 results reflect the success of our innovation-led growth strategy and the growing global confidence in ARAPL’s technology. The Atlas AC2000 order marks a defining milestone that validates our engineering strength and accelerates our global expansion. With a healthy order book and continued investment in AI and autonomous systems, ARAPL is positioned to lead the next phase of intelligent industrial transformation.”
Founded in 2005 and headquartered in Pune, Affordable Robotic & Automation Ltd (ARAPL) delivers turnkey robotic and automation solutions across automotive, general manufacturing, and government sectors. Its offerings include robotic welding, automated inspection, assembly automation, automated parking systems, and autonomous driverless forklifts.
ARAPL operates five advanced plants in Pune spanning 350,000 sq ft, supported by over 400 engineers in India and seven team members in the US. The company also maintains facilities in North Carolina and California, and service centres in Faridabad, Mumbai, and San Francisco.

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M.E. Energy Bags Rs 490 Mn Order for Waste Heat Recovery Project

Second major EPC contract from Ferro Alloys sector strengthens company’s growth

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M.E. Energy Pvt Ltd, a wholly owned subsidiary of Kilburn Engineering Ltd and a leading Indian engineering company specialising in energy recovery and cost reduction, has secured its second consecutive major order worth Rs 490 million in the Ferro Alloys sector. The order covers the Engineering, Procurement and Construction (EPC) of a 12 MW Waste Heat Recovery Based Power Plant (WHRPP).

This repeat order underscores the Ferro Alloys industry’s confidence in M.E. Energy’s expertise in delivering efficient and sustainable energy solutions for high-temperature process industries. The project aims to enhance energy efficiency and reduce carbon emissions by converting waste heat into clean power.

“Securing another project in the Ferro Alloys segment reinforces our strong technical credibility. It’s a proud moment as we continue helping our clients achieve sustainability and cost efficiency through innovative waste heat recovery systems,” said K. Vijaysanker Kartha, Managing Director, M.E. Energy Pvt Ltd.

“M.E. Energy’s expansion into sectors such as cement and ferro alloys is yielding solid results. We remain confident of sustained success as we deepen our presence in steel and carbon black industries. These achievements reaffirm our focus on innovation, technology, and energy efficiency,” added Amritanshu Khaitan, Director, Kilburn Engineering Ltd

With this latest order, M.E. Energy has already surpassed its total external order bookings from the previous financial year, recording Rs 138 crore so far in FY26. The company anticipates further growth in the second half, supported by a robust project pipeline and the rising adoption of waste heat recovery technologies across industries.

The development marks continued momentum towards FY27, strengthening M.E. Energy’s position as a leading player in industrial energy optimisation.

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