Core Making

1.0 CORE MAKING:

1.1 An instruction starts with issue of allotment card from production supervisors to charge/hand to core makers.

1.2 Check allotment card for description Model number and customer name. Supervisor is responsible for referring this with the core box issued.

1.3 Clean core box before starting core making.

1.4 Before filling the sand in core box, check whether placement of zircon sand, chills, proper reinforcement, Gas venting are done as per the instruction written on the core box.

1.5 Cores are to be made hollow as per instruction written on the core box. If there is no instruction on core box, the same is clarified with supervisor if required.

1.6 Care is to be taken by core- maker, to avoid loose ramming over gassing in case of Carbon–di-oxide and Sodium silicate cores.

2.0 POST – CORE MAKING:

2.1 Check the hardness by Hardness tester in case of Carbon-di-oxide and Sodium silicate after core making.

2.2 Ensure proper setting time and curing in case of phenolic/no bake process i.e., curing time 6 to 8 hrs, minimum. To ensure proper curing, use cores made in a shift after a gap of one shift.

2.3 Check surface finish for roughness and loose ramming.

2.4 Ensure proper storage of cores.  

2.5 The post- core making activities procedure is to be checked by the supervisor.

2.6 After above are completed, core is to be identified with date.