MOLDING SAND
The general sources of receiving molding sands are the beds of sea, rivers, lakes, granulular elements of rocks, and deserts. The common sources of molding sands available in India are…
FLASKS
The common flasks are also called as containers which are used in foundry shop as mold boxes, crucibles and ladles. 1. Moulding Boxes Mold boxes are also known as molding…
Hand Tools Used In Foundry Shop
The common hand tools used in foundry shop are fairly numerous. A brief description of the following foundry tools (Fig. 11.1) used frequently by molder is given as under. Hand…
Design Considerations In Pattern Making
The following considerations should always be kept in mind while designing a pattern. 1. All Abrupt changes in section of the pattern should be avoided as far as possible. 2. Parting line…
Core Box
Any kind of hollowness in form of holes and recesses in castings is obtained by the use of cores. Cores are made by means of core boxes comprising of either…
Core And Core Box
Cores are compact mass of core sand that when placed in mould cavity at required location with proper alignment does not allow the molten metal to occupy space for solidification…
Pattern Allowances
Pattern may be made from wood or metal and its color may not be same as that of the casting. The material of the pattern is not necessarily same as…
Types Of Pattern
The types of the pattern and the description of each are given as under. 1. One piece or solid pattern 2. Two piece or split pattern 3. Cope and drag…
Factors Effecting Selection Of Pattern Material
The following factors must be taken into consideration while selecting pattern materials. 1. Number of castings to be produced. Metal pattern are preferred when castings are required large in number.…
Plaster Wax patterns
Plaster This material belongs to gypsum family which can be easily cast and worked with wooden tools and preferable for producing highly intricate casting. The main advantages of plaster are…
