By Matthew Jaster
How do gearbox and gear drive providers navigate the interesting challenges found in steel, cement, paper, and construction applications? Apparently, one application at a time.
Thanks to condition monitoring technology, IoT solutions and the flexibility of engineering teams today, plant downtime is not as problematic as it has been in the past. The secret to success in heavy industrial markets comes down to staying ahead of component failures.
“The focus today is on complete pack ages; gearmotors and high-power inverters. Customers in heavy indus trial applications are looking for partners that can be a solution provider.
They are also sensitive to new IoT solutions,” said Leonardo Sgarzi, heavy-duty sectors, sales, and development.
This kind of product modularity and flexibility is found in Bonfiglioli’s Planetary Series (300). The 300 series is compact and powerful, excelling in areas where shock loads and impacts are more the rule than the exception.The product configuration is highly versatile, due to several options for mounting, gear layout, output shaft and motor interface. Sgarzi believes customer’s needs in the heavy-duty sector are related to personalized services and solutions for every application.
Bonfiglioli’s Planetary Series (300)
“They require the highest flexibility and reactivity mainly due to market volatility and uncertainty, as well as to match even tighter time- frame in project developments,”Sgarzi said.
“Bonfiglioli is continuously improving and developing tailor-made processes for product lines and solutions, also investing on new and focused production plants and hubs in the aim of a higher verticalization.”
This verticalization concept brings all the Bonfiglioli teams together to focus on the organization’s technological advantage and strong specialization that greatly benefits end users.
The most fascinating challenge in providing solutions for the heavy-duty industry is the commitment to supply customers with perfectly balanced drives packages that are maximized — in terms of efficiency—to increase the profitability of the entire process.
So, why are customization and reverse engineering so vital in applica tions like construction, steel, cement, cranes, shredders and screw conveyors?
“We’re highly focused on providing solutions suited to customers’ needs to have full control and knowledge of their machine usage and lifecycle. IoT and predictive maintenance are the keys to technological improvements and uti lized to minimize the maintenance/ failure cost impacts,” Sgarzi said. Condition monitoring strategies have led the company to develop dedicated solutions that are in-line with every customer/end-user expectation.
“Customers will also benefit from higher efficiency gains, scheduled maintenance, and a reduction of cost of ownership,” he added.
From a design point of view, the strategy Bonfiglioli pursues is to increase the power density of gearboxes through the optimization of structural components.
“In this sense, we use the most modern software tools, trying to reduce the weight without compromising performance. From a technological point of view, the introduction of new gear finishing processes and high-level components and materials, allows us to increase the efficiency of our products.
Bonfiglioli’s R3-EVOX gearbox
Our customers obtain a reduction in energy consumption to be more compliant with market demands,” Sgarzi said.
The future of heavy-duty drive and gearboxes will be linked to efficiency.”The real machine/plant lifecycles settled by specific sector/application rules will drive this change,” Sgarzi said.
“Proper longevity and minimized energy downtime and cost of ownership will be the pillars for the future of our business.
Advanced solutions such as sensors, predictive maintenance, augmented reality and IoT will be the keys to this important switch.”
Xtek products can be found anywhere durability is needed for the most demanding applications in industries ranging from steel and aluminum production to mining and energy, and more. The company, headquartered in Sharonville, Ohio, provides high-quality custom machined and heat-treated parts and component assemblies for heavy-duty industrial processes.
Founded in 1909, Xtek was known as the Tool Steel Gear & Pinion Company.
A young inventor, Russell Bloomfield, was seeking a way to make cup and cone bearings for bicycles that could take the harsh pounding of the period’s cobblestone streets.
Bloomfield’s work led to the development of a steel hardening process that eventually became known as the Tool Steel Process (TSP) because the metallurgical properties that it imparted to gears and bearings made them “as hard and as durable as tool steel.”
The original focus of the organization was on gears for traction cars. Later, the company applied its metallurgical techniques to heavy-duty equipment applications in railroads, mines, and steel mills.
Xtek applies its metallurgical techniques in areas like steel mills in order to reverse engineer components.
Through the decades, Xtek has evolved into a manufacturer of custom engineered components for a wide range of industrial applications.
A recent blog on the company’s web site detailed the variety of engineering expertise that makes the organization better with materials, customized heat treatment options, and finish machining techniques. Xtek boasts a diverse lineup of engineering expertise with backgrounds in mechanical, manufacturing, materials science, electrical, aerospace, biomedical and industrial engineering.
Application engineering: providing analysis (FEA, etc.) on parts and assemblies, analyzing application requirements, and offering design recommendations.
Design engineering: applying industry standards to product development, and creation of manufacturing and detail drawings.
Manufacturing engineering: developing manufacturing processes and programming for all CNC equipment.
Service engineering: reverse engineering application components, offering upgrade recommendations and determining repair specifications.
Metallurgical engineering: conducting material failure analysis and specifying material composition and heat treat process selection.
With such diverse expertise, it’s not surprising to hear that the company recently retired a mill pinion after 58 years of service.
This set of carburized mill pinions for a major European hot strip steel mill was manufactured in 1964. Although it had some minor sur face wear, it was still in great condition considering the timeframe.
Engineers at Nuttall Gear and Delroyd Worm Gear spend many shifts reverse- engineering equipment in harsh, heavy-duty environments.
A Delroyd reverse-engineered worm and worm gear for a screwdown mill.
Whether it’s a gearbox or gear drive, maintenance managers meet with application engineers to determine the best course of action to keep steel mills running optimally to avoid downtime.
Nuttall Gear Rebuilds Enclosed Reducer for Steel Processing Line
A major steel producer needed an upgrade to a straightener gear drive. The service requirement on the exist ing drive was increased which caused the heavily loaded gear in the train to fail due to overload.
Driven by a 500 hp motor, the straightener pulls strip steel through two sets of rollers that relieve stresses while straightening the coil.
Nuttall Gear provided the upgraded gear drive based on their long-stand ing working relationship with the cus tomer and their reputation for design ing and manufacturing robust steel mill gear drive solutions.
The rebuilt drive featured a reduction ratio of 1:1, a 1.25 service factor with a 160 rpm input and 160 rpm output.
The gearing upgrade to the affected components was changed from through hard ened gears to carburized and ground gears for enhanced wear resistance and improved shock load capacity.
A rebuilt Nuttall gear drive from a steel processing line
Upgrades to a charging crane hoist gearbox resulted in extending the gearbox life by more than five years.
The gear drives for screwdown mill stands at a major steel mill in Ohio were failing prematurely causing extensive downtime.
The worm gear teeth were wearing and breaking down at an accelerated rate due to improper meshing at the contact zone. The prob lem created excessive pressure at the gear’s pitch line/contact zone.
Delroyd engineers met with the hot mill managers to conduct an on-site inspection and short-term mill stand monitoring period.
Through these efforts, it was determined that the cause of the drive failures was that three different gearing manufacturers had supplied gearing, all with differ ent thread designs, which were being mixed and matched over time.
A spare worm and gear sample was sent to the Delroyd facility so that a new gearing solution could be reverse engineered to ensure that all gear sets installed on the hot mill stands would have a matching thread/tooth design.
The new Delroyd gearing solu tion extended the gearing life from six months to more than six years.
Gearboxes for a charging crane hoist drive were failing prematurely at a large steel mill in Northeastern U.S.The failures were causing unfavor able outages and expensive periods of downtime.
Due to their desire and reputation to solve problems, Delroyd was called in to help analyze the situation and develop a solution. A meeting was held at the mill with various parties includ ing an outside service group, mill engineers, maintenance managers and Delroyd engineers. All aspects of the ongoing issues were reviewed and an on-site inspection of a failed gearbox was performed.
Based on their findings, Delroyd engineering developed new worm gear sets utilizing aluminum bronze gears and redesigned the bearing mountings to enhance strength and durability.
lA carburize hardened, ground, and polished alloy steel worm develops a smooth, work-hardened surface on the aluminum bronze gear.
Extra- heavy side plates were used to connect the worm and gear shaft bearing supports, assuring proper meshing of the gear under all conditions of load.
A more rigid fabricated steel housing design was utilized to reduce bending moment stresses. A redesigned, more efficient lubrication system was also incorporated.
The Delroyd design changes resulted in extending the gearbox life by over five years. The charging crane gearbox success prompted the mill to utilize Delroyd’s expertise by providing gearboxes for their gantry cranes as well.
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