MAKING METHOD OF SHANK DRILL AND SHANK DRILL FOR BOARD HALL PROCESSING

摘要

Disclosed herein are a method for manufacturing a shank drill for drilling holes in boards and a shank drill manufactured thereby. The manufacturing method includes: a mixing step of mixing 20-30 wt% glass powder, 30-50 wt% stone powder and 30-40 wt% PPS resin with each other to provide a mixture; a melting step of heating and melting the mixture at a temperature of 320-340 0C; an injection molding step of inserting a metal shank in an injection mold and injecting the melted mixture into the mold at a pressure of 50-75 kg/cm ; a cutting step of cooling a molded shank resulting from the injection molding process and cutting the cooled shank to a given length; a molded shank-cutting step of cutting one end of the molded shank into a conical shape such that a portion of the metal shank is exposed; an air groove-forming step of forming an air groove having an opened, curved cross-section on the outer circumference of the molded shank in a longitudinal direction; and a flute-forming step of forming a spiral cut groove 11 on the outer circumference of the exposed metal shank to form a flute.