Molds from the factory aren’t built to last
The truth is, new molds bought from the factory are designed for precision but not for longevity. The steel that is used in their construction can stand up to softer aggregates for some time however, the harder aggregates like granite wear away the steel quickly.
We can help you
Gordon Technical can save your molds. Do not throw them away! Instead, give them to us and we will resurface them for you. We use a technique that binds chromium to the existing surface of your mold and then we grind it down to be well within spec. The best part about all of this is that chromium is hard. How hard? Here comes the sciency bit:
Steel has an average hardness of 4-4.5 on the Mohs hardness scale. Granite has an average hardness of about 7. Because granite is harder than steel, steel gives in when granite is pressed against it. During normal conditions in a gyratory, the steel only gives a very slight amount and the wear goes unnoticed but after multiple cycles, the wear becomes worse and worse.
Chromium has an average hardness of 8.5 on the Mohs hardness scale. Because it is harder than granite the material doesn’t give every cycle. This means that the chromium only has to deal with the pressure that’s put on it, and it will last longer. But that’s not all. Chromium when added to steel is even stronger. So you now have a supermaterial in your gyratory mold . Holding back the wear from your aggregate. Sticking with you for much longer than your factory-made gyratory mold.
Ok, I’m in, what do I need to do?