Process Enhance of PCB Micro-Drilling

Mechanical Engineering

In this growing world of technology miniaturization is a key word. Drilling is one of the most fundamental machining technologies and is moving toward high precision/high speed application for productivity enhancement. The drill tools play a critical role is increasing the productivity of a cutting process. Although the price of a cutting tool itself is relatively low, the costs caused by tool failures are considerably higher. Therefore, from the viewpoint of cost and productivity, modelling and optimization of drilling processes are micro drilled holes are utilized in many of today’s fabrication processes. Precision production processes in industries are trending toward the use of smaller holes with higher aspect ratios, and higher speed operation for micro hole drilling .Experiment was conducted on FR-2 as a work piece material using carbide drill having 0.7 mm diameter.FR-2 sheet with copper foil lamination on one or both sides is widely used to build low-end consumer electronic equipment.In the present work, spindle speed and feed are chosen as machining parameter to see the effect of circularity and taper angle on workpiece.Usingtaguchi methodology, L27 orthogonal array has been chosen and experiment has been performed as per orthogonal array design. For validation of the predicted value and optimization result, confirmation experiments have been performed with optimum levels of machining parameters. It is experimentally found that spindle speed is more influencing parameter for hole quality in terms of circularity and taper angle.

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