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Wednesday, March 6, 2019

Lectures Notes On Metal Forming Processes

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Metal forming is a general term for a large group, that includes a wide variety of manufacturing processes. Metal forming processes are characteristic in that the metal being processed is plastically deformed to shape it into a desired geometry. In order to plastically deform a metal, a force must be applied that will exceed the yield strength of the material. When low amounts of stress are applied to a metal it will change its geometry slightly, in correspondence to the force that is exerted. Basically it will compress, stretch, and/or bend a small amount. The magnitude of the amount will be directly proportional to the force applied. Also the material will return to its original geometry once the force is released. Think of stretching a rubber band, then releasing it, and having it go back to its original shape. This is called elastic deformation. Once the stress on a metal increases past a certain point, it no longer deforms elastically, but starts to undergo plastic deformation. In plastic deformation, the geometric change in the material is no longer directly proportional to stress and geometric changes remain after the stress is released; meaning that the material does not recover its shape. The actual level of stress applied to a metal where elastic deformation turns to plastic deformation is called the proportional limit, and is often difficult to determine exactly.

Content:-

Module-I

* INTRODUCTION

* Yield Criteria

* Commonly used Yield Criteria

* DIFFERENCE BETWEEN HOT AND COLD WORKING

* ADVANTAGES AND DISADVANTAGES OF COLD AND HOT WORKING PROCESSES

* Forging

* IMPRESSION DIE FORGING

* FORGING DEFECTS

* FORGING DESIGN

* Allowance