Investigaion into a New Forming Process for a Hollow Article with Flange and Its Application : (1st Report, On the Basic Features of the Process)

概要

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A new cold forming process of a hollow article with flange is developed. In this process, a special flow of the material for recess formation, which appears at the final stage of the conventional extrusion process, is promoted by applying an auxiliary mandrel load. This process has features of efficiency of production, high quality of the product and lower working load as compared with the conventional process. Further, this process is improved into a more efficient and easy process through the adoption of an idea to punch the hollow top of the product in the same working stroke. This punching achieves a precision shearing and a smooth sheared surface is obtained. Moreover, the punching die is useful to determine the product height and suppress the necking at hollow wall which limits the applicable mandrel load. So, the process becomes much easier to practice and an application to an actual gear blank with boss is possible.
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