Managing mill maintenance: Getting your dies and rolls re-worked locally to global standards

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					                      Digital Re-print -
                  January | February 2014
Managing mill maintenance: Getting your dies and
   rolls re-worked locally to global standards

   Grain & Feed Milling Technology is published six times a year by Perendale Publishers Ltd of the United Kingdom.
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   or by any means without prior permission of the copyright owner. Printed by Perendale Publishers Ltd. ISSN: 1466-3872




                           www.gfmt.co.uk
MILL MAINTAINANCE




 Getting your dies and rolls
 re-worked locally to global
 standards
 by Leif Wolf, Director, O&J Hojtryk AS, Denmark




 O
           &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: info@oj-hojtryk.dk
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
Cremona, Italy.

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: info@iaom.info                                                                                   Fax: +45 82 28 91 41        Ørnevej 1, DK-6705
                                                                                                 mail: info@oj-hojtryk.dk       Esbjerg Ø
       For more information, visit: www.iaom.info/education                                                                     CVR.: 73 66 86 11
                                                                                 LINKS
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Description: O&J Denmark had the idea to re-work dies and rolls over three decades ago with an intention to assist the market demand to grind and re-countersink worn dies into ‘as-new’ dies at a time when dies were very expensive.
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