AN OVERVIEW OF THE DEFECT IN THE MANUFACTURING OF ROUND HEADED CENTRE BOLT WITH ITS SOLUTION

Engineering

The objective of this paper is to identify and understand cold forging processes of round headed centre bolt, investigate the defect and provide solution for it. In cold forging a metal piece is shaped to required product by compressive force applied by punches . Cold forging is one of the oldest methods used in manufacturing. It is easy as well as time saving method of production. Forging drawing is a very important part before the start of forging process. The stages in which forging will be done is shown in the forging drawings. The main advantage of cold forging process is that metal is not wasted like in machining. Also, Complex parts can be easily formed by proper designing of punch and dies. The dimensional accuracy obtained is very close to the specified dimension. Majority of cold forging parts are manufactured for the automobile industry. Cold forging process not only saves material but also saves time. The only drawback of cold forging is that it uses trial and error method for the formation of product. Man skill is used for this. Recently the use of technology is done and various softwares are being used for prediction of the states during forging. Initially different kinds of material that can be used for cold forging are discussed. The defect and solution provided is for round headed centre bolt made of alloy steel. A brief description of formation of centre bolt by cold forging is described. Finally the problem in the formation of round headed centre bolt and solution are discussed which have helped in reducing the rejection of the round headed centre bolt.

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