Patent ID: 8091452
Filing Date: 2012-01-10
Classification: B23B,B23P

Abstract:
1. A method for manufacturing a drill head comprising a screw shank which has been integrated with a head body, the screw shank configured to be coupled in threading relation with a distal end portion of a hollow tool shank of a deep-hole cutting drill, both sides of the screw shank which sandwich a thread portion of the screw shank being configured to adhere closely as bounded circumferential face portions to a periphery of the tool shank, when the screw shank is coupled with a distal end portion of the tool shank, the method comprising: welding and integrating a screw shank cylindrical member having cutting stock left at least on the bounded circumferential face portions with a rear end of the head body for which a cutting blade tip has previously been brazed to a cutting blade mounting seat; and thereafter cutting the cutting stock of the screw shank cylindrical member to thereby make at least a portion of the screw shank cylindrical member thinner-walled in order to form the screw shank.