Mumbai University > Mechanical Engineering > Sem 4 > Production Process II

Marks: 5M

Year: May 2014

Forming is a process of turning a convex, concave or any irregular shape. Form turning can be accomplished by the following methods:

1) Using a forming tool

2) Combining cross land longitudinal feed

3) Tracing or copying a template

For turning a small length of formed surface, a forming tool having cutting edges conforming to the shape required is fed straight into the work. Forming tools are not required to remove much of the material but are just used to finish the formed surface. Usually two types of forming tools are used straight and circular. Straight type is used for wider surfaces and the circular type is used for narrower surfaces. When the length of the formed surface is sufficiently great the required shape may be obtained by using straight turning tool, which is fed into the work using both longitudinal and cross feed simultaneously. This process is tedious and requires much skill.

They are generally used large lots and mass production. Their use ensures a high output, uniform contour on all work pieces and accurate dimensions. Most from tools are made up of H.S.S. but cemented carbides have found an increased use for this purpose. The use of contoured cemented carbide increases the productivity to be raised by 20-40% as compared to H.S.S. tools.