Moulding

1.0 MOULDING

1.1 Process starts with issue of allotment card from production supervisor to Moulding batches.

1.2 Allotment card is checked by the supervisor for the drawing number or pattern number and size with reference to the planning sheet and pattern issued.

1.3 Pattern is to be cleaned before starting Moulding.

1.4 Moulding box is suitably checked prior to Moulding. While Moulding with loose patterns, most    economical box is to be used.

1.5 Before filling the sand in mould check the placement of risers /runners,chills and spruces are    placed as written on the patterns.

1.6 Check and confirm required quantity of facing sand, backing sand and Zircon sand is used as  per standard instructions given below.

1. Zircon sand, wherever marked with dotted area only on pattern and core box.
2. Facing sand approximately 2" thick on the surface of the pattern.
3. Remaining backing sand for bottom moulds and top moulds.

1.7 Take necessary care to avoid loose ramming and over gassing of mould.

2.0 POST MOULDING:

2.1 Check mould hardness at random after 30 minutes of making the mould. Record the hardness in Moulding check list of production log sheet.

2.2 To possible extent, avoid repairs.

2.3 Check surface finish by roughness of mould surface.

2.4 Avoid stacking of more than 4 moulds.

2.5 Supervisor to check and ensure the above instructions are followed.