Design and fabrication of a spinning process for manufacturing spark plug holding cap used in EFI engine

Abstract

METAL SPINNING is a term used to describe the forming of metal into seamless, axi- symmetric shapes by a combination of rotational motion and force. Metal spinning typically involves the forming of axi-symmetric components over a rotating mandrel using rigid tools or rollers. There are three types of metal spinning techniques that are practiced: Manual (conventional) spinning, Power spinning, and Automatic spinning. These 3 techniques are described in this article. The equipment for metal spinning is based on lathe technology, with appropriate modifications for the components that are being formed. Typically, sheet preforms are employed to allow relatively low forming stresses. Metal spinning can be used to cost-effectively produce single or a small number of parts out of expensive materials, such as platinum or large quantities of components of low-cost materials, such as aluminum reflectors. In this article, the term preform is used to describe the component both before and during metal spinning; other terms that are sometimes used include work piece and starting blank. In manual spinning, a circular blank of a flat sheet, or preform, is pressed against a rotating mandrel using a rigid tool. The tool is moved either manually or hydraulically over the mandrel to form the component. The forming operation can be performed using several passes. Manual metal spinning is typically performed at room temperature. However, elevated temperature metal spinning is performed for components with thick sections or for alloys with low ductility. Manual spinning is only economical for low-volume production. Manual metal spinning. In this project, for the manufacturing of a spark plug holder a spinning process has been designed and fabricated. With the designed set up experimentation has been carried out. It has been found that the manufactured holding cap are uniform in thickness in different sections and defect free holding caps can easily be manufactured from the setup.