Digital Re-print -
January | February 2014
Managing mill maintenance: Getting your dies and
rolls re-worked locally to global standards
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Getting your dies and rolls
re-worked locally to global
by Leif Wolf, Director, O&J Hojtryk AS, Denmark
&J Denmark had the idea to installed properly with particular attention of wear parts. It is worth remembering that
re-work dies and rolls over three being paid to positioning of the roll assembly a full refurbishment and cost will depend on
decades ago with an intention correctly against the die production surface. the work required.
to assist the market demand to grind and Failing to fit machines properly can result in Deciding when to ship a die for re-work-
re-countersink worn dies into ‘as-new’ non-uniform wear in the ring die and non- ing is always a balance. Ultimately it comes
dies at a time when dies were very uniform pellets. down to a choice between controlled main-
expensive. tenance versus damaged based maintenance.
Die- and roll-refurbishment A full refurbishment includes cleaning
The machines used for this work could O&J Denmark has been able to establish the die and checking for cracks by using the
not be bought at the time so we undertook a strong brand in the marketplace, servicing O&J HPJC21 High-Press Blowout System by
the challenge to design, develope and manu- clients over very long distances. means of water only – and without chemi-
facture such equipment ourselves. Thanks to great trust from all our clients cals. The advantage of using this method is
Since then many others and some we can offer a full re-working set up includ- that the water is strong enough, blowing out
from different perspectives have come up. ing logistic solutions. with 1.250BAR/aprox 17,000PSI, to dislodge
However, O&J has been at the very fore- The mills book all shipments directly to stubborn material without harming the press
front of this industry and still is. our freight forwarding company operating channels.
Clients of interest include: in their region, bringing dies and rolls to our Next, comes grinding the die production
• Feedmills - for livestock such as pigs, re-working center in Esbjerg, Denmark and surface, skimming level and machining using
poultry and cattle, shrimp feed returning with the same afterwards. the O&J DG1700-1 grinding machine specifi-
• Bio/wood mills including palm fibre mills Simple but highly effective – mills pay cally designed for dies and rolls.
• Waste mills no waste time!, 1 click and the goods are Finally, having it re-counter sunk again
• Others booked and automatically returned again by using the O&J CSV14-3 counter sinking
The benefits from die- and roll- when the re-work is complete. machine for ring dies.
refurbishment include: In other regions throughout the g-lobe
• Increases life time of pelleting this may be different due to existing infra- Differences between regions
equipment structure, labour cost etc. In the northern states of Europe and
• Increase throughput At the re-working center dies and rolls Scandinavia, mills generally carry out re-
• Significant reduces power usage are checked on arrival, their actual worn working to both ring dies and rolls.
• Securing higher pellet quality condition, any damage, etc, with assessment Ring dies get re-grounded, re-counter
A feedmill is only as strong as its weakest of how re-working would be or not be sunk and cleaned up - schematically dies
link. Each machine has to work as its best. profitable to the client. get re-worked two or three times a
Investing time and money in feed for- It is a partnership. If a die is wrongly worn lifetime, depending to production and die
mulation can be quickly written off if the a contact shall follow from here giving a note condition.
pelleting machinery used isn’t up to scratch. to the client helping him back on track again. Rolls are normally ground the first time
For example, a good client is a mill and then given a new roll shell the next
Installation and usage running controlled production systems and time. Also, items such as axles, bearings,
From the start, machines need to be therefore will have a controlled degradation cover plates and seal collars are cleaned up
35 | January - February 2014 Grain &Feed millinG technoloGy M
and controlled before re-assembling which centre in Cebu, which is now giving such
includes a new roll shell. re-working possibilities to local mills in
In other regions throughout the globe, that region. Even though there have been
this may be different due to existing infra- a few obstacles to overcome, the region
structure, labour cost, etc. shows great interest in the local set-up
However, we register from those other having their dies and rolls re-worked
regions an ever growing interest using our there and generally following the same
techniques and machines to set up service ideas as we operate here. More inforMation:
centers for re-working. We invest great inter- Apart from Europe, O&J machines are O&J Højtryk A/S
est in being at their service – working together in operation in India, Thailand, Singapore, Tel: +45 75 14 22 55
facing a common future and possibility. Korea, China, USA and Canada and there’s Fax: +45 82 28 91 41
A fine example is that a year ago we more to come – O&J is creating a future Email: firstname.lastname@example.org
fulfilled delivery of technical equipment together with dedicated clients throughout Website: www.oj-hojtryk.dk
to the Philippines for a local service the globe.
Empower your employees with tools and
problem-solving skills at IAOM’s Fundamentals
of Milling I and II courses, offered at Ocrim’s
International School of Milling Technology in
Fundamentals of Milling I: March 17-21 Die and roll re-working machines
Fundamentals of Milling II: March 24-28
Technical training courses that combine lectures and discussions
with hands-on laboratory and pilot-scale milling exercises.
Experience this unique learning environment where classroom,
lab, manufacturing plant, and pilot mill all come together.
International Association of Operative Millers
10100 W. 87th Street, Suite 306
Overland Park, KS 66212 USA www.oj-hojtryk.dk
T: +1 913-338-3377 | F: +1 913-338-3553 Phone: +45 75 14 22 55 O&J Højtryk A/S
E: email@example.com Fax: +45 82 28 91 41 Ørnevej 1, DK-6705
mail: firstname.lastname@example.org Esbjerg Ø
For more information, visit: www.iaom.info/education CVR.: 73 66 86 11
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