Finishing

After the castings are removed from their molds, they are transferred to the Finishing Hall for cleaning, heat treatment, and final operations. In this hall, all cleaning processes are carried out, including the removal of gates and risers, grinding of excess material, heat treatment (depending on the type of steel or cast iron), and finally, shot blasting and the removal of residual sand.

Objectives of Heat Treatment in the Finishing:

Heat treatment in the finishing hall is generally conducted to achieve the following goals:

1. Stress Relief:
   • Relieving stresses caused by mechanical work or uneven cooling.
2. Grain Structure Optimization:
   • Refining the grain structure in steels that underwent hot working, which may have coarse grains.
3. Hardness Reduction and Improved Formability:
   • Reducing hardness to enhance ductility and machinability.
4. Hardening for Wear Resistance:
   • Increasing the hardness of steel to improve wear resistance or toughen steel for better performance under working conditions.
5. Toughness Improvement:
   • Enhancing the toughness of steel to produce high-strength and flexible materials, as well as improving impact resistance.
6. Improved Machinability:
   • Optimizing steel properties to facilitate machining processes.

Primary Heat Treatment Methods for Steel and Cast Iron:

1. Full Annealing
2. Homogenization
3. Normalizing
4. Tempering (Stress Relief)
5. Quenching in Water Baths
6. Air Quenching

These processes are carefully selected based on the material properties and the intended use of the cast parts, ensuring optimal performance and durability.