Effective designs of hardmetall microdrills for deep drilling of the package of printed-circuit boards

Abstract

In this work are given the results of the study of power characteristics of the process of deep drilling printed circuit boards package for microelectronic devices, including for the production of individual control units mechanistic systems carbide micro drills depending on the depth of drilling, cutting conditions and the geometry of the drill. In particular, we studied the behavior of the indicators of axial force and torque, depending on the drilling depth for drill bits with different angles of inclination of the spiral groove with the help of specially designed high-sensitivity instrumentation, enabling the direct method of measurement. Based on the analysis results of the study changes in the geometry of the existing standard drills. A new design micro drills variable angle of the spiral groove, so that the angle has a maximum value at the tip of the drill, and decreases uniformly towards the end of the working part. Drill bits made this design with different angles of inclination of the spiral grooves. On the basis of these experiments is selected over near standing on their athletic performance to a standard drill and held it a comparative test with a standard drill, bringing them to failure, because of what proved drills Advantages of the new design. Considering the results of the experiments proposed drills elongated structures to improve processing performance by increasing the drilling depth and number of plates, respectively, in the processed packet of printed circuit boards.

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