28. Design and Analysis of Hydraulic Machining Fixture for a Drifter Bit of a Top Hammer

Jigs and fixtures are special production tools which are used to make the standard machine tool and more adaptable for different operations to be done. Jigs and fixtures are the economical ways to produce a component in mass production. The present work deals with the design of machining fixture for drilling operation for a drill bit of top hammer which is termed as drifter bit. Without jigs and fixtures, this component machining is carried out by manual indexing, setting the work piece for every single component, etc. Therefore, to meet the present production requirement, the time required has to be reduced by using a fixture that can hold the component on a 5-axis machine. A hydraulic fixture is designed for good manufacturability and assembly, and proper fixture elements and hydraulic elements are selected. Model is developed in Creo 4.0. Deflection and von miss stresses are predicted by using ANSYS 17.2 software. Total equivalent stress of the structure is 9.816 N/mm². At the required cutting force, the maximum deflection obtained is 10 microns. The actual permissible limit is 15 microns. So, the obtained value is within the permissible limits for the required cutting force.