Rollers and shafts for granulators and pelletizers
Rolls
Arched Opening Straight
Complete rollers and roller shells. Nominal and oversize.
XLD (Extended Life & Durability) rollers manufactured by Nawrocki Technologie Granulowania are the result of forty years of experience in granulation, mechanical and thermal processing. We supply roller shells, complete rollers and accessories for the largest global and Polish users of granulators. Our rollers are designed for granulators with manual roller adjustment and by remote adjustment system.
Durability and durability of rollers
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certified steel,
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repeatable and highest CNC quality,
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high mechanical strength,
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high abrasion resistance,
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failure rate below 0.2%,
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excellent precision of workmanship,
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production time up to 5 days.
Tread - working surface
We produce rollers with different types of tread for all types of granulators with ring and flat dies.
We advise on selecting the optimal working width of the tread for the power and internal diameter of the die.
Accessories for rollers for pellet machines
We supply complete rollers, roller shells and a full range of accessories: covers, shafts (eccentrics), seals.
Roller production parameters
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Sizes: diameter from 100mm to 600mm,
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Induction hardening to a depth of up to 6mm,
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Conventional through hardening,
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Hardness: max 62 HRc (adjustment possible),
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Tread: arc, hole, straight (open or closed), skew, mixed,
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Special rollers with individual tread.
Rollers for all brands of granulators
We produce complete rollers and roller shells for the following brands of granulators:
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CPM, LaMeccanica, Buhler, Munch, VanAarsen, Promill-Stolz,
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Andritz, Kahl, Salmatec, Mabrik,
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PTN, DMT, Nawrocki TG, Testmer.
In addition, we will produce each roller based on the ordered documentation or created according to the provided pattern.
ARC ROLLERS
Open, Closed
The number of teeth depends on the raw material
Production of pellet rollers
We manufacture the rollers in our factory in Żnin. We have a complete machine park for machining and 2 heat treatment stations with four hardening furnaces.
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The raw material from which we produce the rolls is first roughly turned on a conventional lathe and then turned on CNC centers, where we also perform threading and other operations in accordance with the documentation.
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The turned forging then goes to the milling department, where the tread is created – the working surface: arc, hole, straight or slanted. On special request, we also make mixed treads.
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Then we mark it with an individual number and harden the roll, first the outer surface, then the inner surface. After hardening, we temper the roll to obtain the correct parameters. We also harden it using the through-hardening method.
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After full heat treatment, the internal surface is turned and then ground (on grinders, not lathes) to obtain a perfect finish for bearings.
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The finished roll goes to the warehouse, where we store it in appropriate conditions.
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All production is carried out in accordance with the ISO 9001: 2015 standard, continuously recertified by Dekra Certification since 2006.
Quality control of roller shells
All roller shells manufactured by Nawrocki Technologie Granulowania undergo a control procedure. Each shell is given a unique number, which allows for full identification of the steel and the production process.
Quality control includes
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hardness of the inner and outer surfaces,
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dimensions of individual sections and surfaces,
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smoothness of the grinding of the inner surface under the bearings.
The quality of our rolls is proven by our Clients, who include the largest feed producers in the world. They have trusted our technology, confirmed the quality and punctuality. By joining them, you receive a guarantee of reliability and satisfaction.
Regeneration of rollers
Only comprehensive service ensures the highest quality and timely deliveries. Therefore, in addition to roller shells, we supply a complete set of roller accessories: eccentrics, bearings, covers and seals, as well as lubricants.
We offer full regeneration of complete rollers with control of the technical condition of the parts and bearings. If they need to be replaced, we will perform the appropriate actions to restore the roller to a usable condition. The regenerated roller is checked for correct assembly, is lubricated and practically ready for use. We scrap or return used parts.
For roller regeneration we recommend high-strength and quality bearings from leading manufacturers: SKF, Timken, Nachi. We also offer cheaper bearings.
Regeneration of rollers and environmental protection
We dispose of used rollers, bearings and lubricants in accordance with internal ISO 14001 Environmental Management Systems procedures. We clean all roller elements in cold cleaning machines. Used cleaning material is periodically replaced by our supplier and safely degraded with respect for environmental protection principles.
Redesign of the rollers
We all know that simplifying reduces failures and costs. That's why we offer redesign of rollers that are problematic in design. This often involves a complicated and outdated sealing system or lid attachment.
When changing the raw material, it is often recommended to also change the working width of the roll. And here we come to help in determining the optimal parameters of the rolls, as well as flat and ring dies.
Induction and through hardening
We harden the rollers and other components in a conventional (through) or induction furnace. We guarantee the hardness of the working surface at a level of up to 62HRc. The surface under the bearings is also hardened and additionally ground, for the highest quality and safety during the use of the rollers.
Steel - certified
Selecting the right steel for the production of a roll is no less important than the steel for the dies. We buy steel only from trusted suppliers, with whom we have been cooperating since 2008. The uniformity, chemical composition of the forgings and their other properties allow us to obtain rolls that can be hardened to the optimum value of 58-60 HRc or higher, depending on the Customers' requirements.
Optimum hardness of the rollers
We always suggest a slightly lower hardness of the rollers than the hardness of the dies, which are much more expensive. Of the two evils, it is better to damage the roller shell than the die – less loss. In addition, the die can be inexpensively regenerated and used again, often, without loss of quality or efficiency.
Oversize rolls
After regeneration, the dies may require the use of rollers with a larger external diameter – so-called oversize rollers. They are necessary to be able to move them to the matrix with a reduced working length. The diameter of the so-called oversizes can be selected individually.
Special rollers
We will be happy to design and manufacture rollers with a special tread, adapted to the specifics of the raw material. These can be rollers with a narrower or wider tread, smaller or larger gaps between teeth or rows of holes. We can also modify the depth of teeth and holes and adjust their hardness.
Jakie cechy definiują najwyższej klasy rolki i wałki do granulatorów i peleciarek, dostarczane przez firmę Nawrocki? Czterdziestoletnie doświadczenie firmy w produkcji tych komponentów przekłada się na unikalne rozwiązania technologiczne i materiałowe, które odpowiadają za ich wydajność i trwałość.
Rolki i wałki do granulatorów i peleciarek
Firma Nawrocki specjalizuje się w produkcji rolki i wałków, które są nie tylko efektywne, ale także wysoce trwałe, dzięki zastosowaniu procesów takich jak obróbka skrawaniem, hartowanie czy szlifowanie CNC. To właśnie ta precyzyjna obróbka, z zastosowaniem zaawansowanych centrów CNC, zapewnia niezawodność i najwyższą jakość produkowanych elementów. Dodatkowo firma stosuje zarówno tradycyjne, jak i indukcyjne metody hartowania, które zwiększają odporność na zużycie oraz uszkodzenia mechaniczne. Dzięki temu produkty Nawrocki są w stanie wytrzymać nawet najbardziej wymagające warunki pracy w różnorodnych środowiskach przemysłowych.
W ofercie Nawrocki znajdują się różne typy rolki, w tym łukowe, otworowe i proste, które można dostosować do specyficznych potrzeb produkcji pelletu. Firma oferuje również rolki specjalne, projektowane na indywidualne zamówienie, co umożliwia dostosowanie produktu do konkretnych wymagań klienta zarówno w zakresie wymiarów, jak i parametrów technicznych.
Kontrola jakości jest nieodłącznym elementem procesu produkcyjnego w naszej firmie. Każda partia produkcyjna przechodzi rygorystyczne testy, obejmujące m.in. pomiary twardości, wymiarów, a także jakości wykonania powierzchni roboczej. Dzięki temu klienci otrzymują produkty, które są nie tylko niezawodne, ale również zgodne z najwyższymi standardami przemysłowymi.