Classification of sand moulds
Posted by Vishnu on April 15th, 2010 08:44 PM | No Comment
5.6.5 Classification of sand moulds
The various typed sand moulds are
1. Green sand mould
A green sand mould is that mould in which the molten metal is poured immediately after the same is ready. No baking is performed in this case. The ...
Moulding processes
Posted by Vishnu on April 15th, 2010 08:32 PM | No Comment
5.6 Moulding processes
The various moulding processes can be classified
1. According to the Method used:
a. Floor moulding
b. Bench moulding
c. Pit moulding
d. Machine moulding
5.6.1 Floor moulding
This method is usually adopted for medium and large size articles which cannot be conveniently moulded through ...
Type of patterns
Posted by Vishnu on April 15th, 2010 08:19 PM | 4 Comments
5.5.5 Type of patterns
There are various types of patterns depending upon the complexity of the job, the number of casting required and the moulding procedure adopted.
1. Solid or Single piece pattern.
A single piece pattern is the simplest of all forms. ...
Pattern materials
Posted by Vishnu on April 15th, 2010 07:48 PM | 1 Comment
5.5.2 Pattern materials
The common pattern materials are wood, metals, plaster, plastics and wax.
(1) Wood
Is the most common material used for pattern making because of the following advantages.
(a) It is cheap and available in abundance
(b)It can be easily shaped into any ...
Pattern and Pattern allowances
Posted by Vishnu on April 15th, 2010 07:30 PM | 2 Comments
5.5 Pattern
A pattern may be defined as a replica or model of the desired casting which when packed or embedded in a suitable moulding material produces a cavity called mould. A pattern differs from the actual component is the following ...
Sand preparation and Sand mould making procedure
Posted by Vishnu on April 15th, 2010 07:22 PM | 1 Comment
5.4.7 Sand preparation
One of the important requirements for the preparation of sand is through mixing of its various ingredients. This is essential to ensure uniform distribution of the various components in the entire bulk of sand.
During the mixing process any ...
Characteristics of foundry sands
Posted by Vishnu on April 15th, 2010 07:11 PM | No Comment
5.4.6 Characteristics of foundry sands
The desirable characteristics of foundry sands are
1. Refractoriness: It is that property of the moulding sand which enables it to withstand high temperature of the molten metal without fusing The moulding sand owes this property mainly ...