No Bake System of Core
Though there are a number of practices involved, Kamani Foundry follows the following systems: -
(a) 3 Part A-B-C- system:
Where’s’ part is Resin, while part ‘C’ is a catalyst (or Activator) and part ‘B’ is a Hardner. The quantities Mixed very depending on the type of Pettern/Mould and the bench life needed for the same. General proper GMS followed are:
Part ‘A’: - 2% of the sand quantity.
Part ‘B’: - 8% of Part ‘A’ and
Part ‘C’: - 15% to 20% of Part ‘A’:
First part ‘A’ and Part ‘C’ are mixed along with sand in the sand mixer for about 90 second to 2 minutes and then Part ‘B’ is added and further mixed for one minute. Immediately after this, sand a discharged from the mixer and put in the core box. The sand mix is rammed by way of hand rammers and leveled on the core box. After allowing the sand to harden slightly, the core is stripped from the Pettern and allowed for ageing further.
(b) 2 – Part System:
In this systems Resin and activator are made in a single from and after mixing it with sand for an initial period of about 2 minutes, Hardner is added and mixed for another one minute. Then the sand mix is put in the core after allowing the sand to harden slightly, the core is stripped from the Pettern and allowed for ageing further.
(c) Single Part System:
Here, it is an air setting chemical is mixed with sand for a minute to 90 seconds and then mould made as a for with further procedure.