Closing

1.0 CLOSING:

1.1 The process starts with issue of work allotment card to supervisors to closing section.

1.2 Take the moulds and cores which are checked and cleared by supervisors for closing.

1.3 Arrange the position of moulds and required cores of the running melt in a transverse line. The same is to be confirmed by the supervisors.

1.4 For moulds and cores the following activities are to be carried out prior to the coating.
1. All gas venting are opened.
2. All loose sand is removed and cleaned.
3. Necessary repair work is carried out.
4. Proper dressing is done around the chills placed area.

1.5 Zircon-thinner base coating is given for Carbon-di-oxide and Sodium silicate mould/core and shell mould/core. Zircon-water base coating is given for phenolic/ no-bake mould/core.

1.6 1) Heat all small and medium cores (UP to 50 Kgs) to drive out moisture in the core oven for 200°C to 300 °C temperatures and for 20 to 30 minutes time. All bigger size (above 50 Kgs) cores are to be heated by hand burner for 2 to 3 minutes approximately.

 2) All moulds are to be heated by hand burner for 2 to 3 minutes approximately.

1.7 Carry out following work on all moulds/cores, after heating process.
 1) Clean all loose burnt sand in the edges.
2) Uneven coatings of the surface are to be removed by brush
  for smooth surface.
3) Final cleaning to be done by blowing compressed air.

1.8 The core hollow in all the heated cores are to be filled-up with green sand or loose sand.

1.9 All cleaned and coated cores are to be assembled in the mould
  and the same are to be confirmed by supervisor responsible.

2.0 After assembling the core, final cleaning is to be carried out by compressed air.

2.1 Moulds are to be closed and clamped by suitable bolts and nuts, preferably bolts and nuts 5/8” size.

2.2 i) All sample moulds are to be re opened and cleaned with  
  Compressed air and closed again.
  ii) Regular production moulds are reopened and closed randomly

2.3 All closed moulds are to be packed with carbon-di-oxide + Sodium silicate at the parting line to avoid possible metal leakage.

2.4 Avoid closing of more than two customer’s items moulds in one particular melt, preferable the whole melt is to be taken for one customer.

2.5 Required keel block mould to be kept ready for each heat and keel block to be poured with out fail.