DVD / Pen Drive - 105

Green Sand Moulding Practices

Green sand moulding is very common moulding process used in small scale and medium scale Cast Iron and S. G. Iron foundries. However, there are many problems faced by these foundries due to inadequate control over the preparation of sand, leading to various types of defects occurring in castings..

Contents:

Composition and constituents in green sand.

Preparation techniques during mixing.

Role of each additives in deciding properties of green sand.

Correct cycle of sand mixing and controlling parameters and recycling.

Behavior of moulding sand after pouring of moulds.

The metal mould surface reactions, evolution of gases, effect of temperature on the sand properties, expansion of sand grains.

Casting defects related to moulding sand practices such as scabs, sand inclusion, sand fusion, metal penetration, rough surface finish etc.

Principles and correct procedures of moulding sand properties like, A.F.S. Fineness No., A.F.S. Clay content, Methylene Blue test, Green compression, Permeability and Compactibility tests.

Interrelation between above sand properties and use of control charts.

The video film NCTS 106 and set of CD 105 give logical understanding sand system controls to foundry engineers. It is useful for training workers, supervisors, engineers working on shop floor to help them to control rejection level to minimum.

The set of films and CDs is supplemented with exhaustive notes on Green Sand Moulding Practices.