Unitac, Inc. Patent applications |
Patent application number | Title | Published |
20110176878 | Drill Head Manufacturing Method and Drill Head - A drill head manufacturing method calls for a cutting tip to be CVD coated, brazed to a distal end of a drill head, polished and then PVD coated. The process effectively utilizes features of a CVD coating, which renders a tool service life longer and enables a drill head more suitable for high-speed cutting to be manufactured. A cutting tip having been CVD coated with a hard material is brazed at a brazing temperature to a predetermined portion at a distal end side of a head main body. An outer diameter portion OD of the brazed tip about a rotation axis of the head main body is polished. Then, the cutting tip and the head main body are PVD coated with a hard material at a second temperature lower than the brazing temperature. | 07-21-2011 |
20110091296 | Throwaway Tip for Deep-Hole Drilling and Drill Head for Deep-Hole Drilling - A three-way indexable throwaway tip for deep-hole drilling can be used as a center cutting blade body for a drill head in either whole cutting type or uncut core break-off type applications. The throwaway tip for deep-hole drilling is of a thick plate body having a three-fold symmetry with three cutting sections that are rotationally spaced apart at a central angle of 120 degrees. When mounted on a drill head, one cutting section of the throwaway tip faces a drilling direction. The forward facing blade edge of that cutting section includes an inner blade edge shorter in blade length and an outer blade edge longer in blade length forming an apex. The outer blade edge is composed of two consecutive blade edge portions of a peak-side outer blade edge portion having a smaller outer blade edge angle and a corner-side outer blade edge portion having a larger outer blade edge angle. | 04-21-2011 |
20110079445 | Drill Head for Deep-Hole Drilling - Provided is a drill head for deep-hole drilling which does not generate such a disc that clogs a cutting chip discharge port when a head main body of the drill head penetrates a work material. The drill head is mounted with a central cutting blade tip | 04-07-2011 |
20110067927 | Drill Head for Deep-Hole Drilling - Provided is a drill head for deep-hole drilling in which a cutting blade tip is mounted to face a cutting chip discharge port opened at a head distal end surface and a hollow inside is made into a cutting chip discharge passage communicating with the cutting chip discharge port, wherein high cutting efficiency based on good cutting chip dischargeability can be achieved and the cutting blade itself is also easily processed in terms of form. The drill head for deep-hole drilling is configured such that an inner end | 03-24-2011 |
20110033255 | Gun Drill - A gun drill has a cutting blade which attains high cutting efficiency without requiring exact positional accuracy at the time of brazing an associated cutting blade tip onto a cutting head. Thus, the cutting head can be manufactured easily and the cutting blade itself is also easily processed. The cutting blade is configured such that an inner end of a blade edge is spaced apart from a head central axis to form a non-cutting zone in the vicinity of the shaft center, a cutting blade side face at the inner end side constitutes an inclined surface which is inclined from the inner end to the head central axis side, and a uncut core of a work material generated in the non-cutting zone is broken off by press-contact of the inclined cutting blade side face during drilling operations. | 02-10-2011 |
20110008116 | Gun Drill - A gun drill is capable of supplying a coolant sufficiently to a cutting region even when a cutting blade or a guide pad is of a brazed type, or when an opening angle of a cutting chip discharge groove is large or when a tool diameter is small and of achieving high cutting efficiency by discharging cutting chips efficiently from the cutting region. The gun drill includes coolant supply passages inside a tool shank and inside a cutting head. A lengthwise direction linear cutting chip discharge groove on an outer circumferential surface extends from a proximal side of the tool shank to a cutting head distal end. The cutting head is formed with a coolant lead-out groove extending from a head-lengthwise direction intermediate portion to the head distal end, at an outer circumferential surface portion at a back side relative to the cutting chip discharge groove. A coolant lead-out port communicating with a coolant supply passage is open at a proximal end side of the coolant lead-out groove. | 01-13-2011 |
20100040425 | Deep Hole Cutting Apparatus - A deep hole cutting apparatus has a guide pad brazed to a cutting head section. With the deep hole cutting apparatus, high machining accuracy can be obtained in a stable cutting status and the service life of the guide pad is lengthened. A guide pad ( | 02-18-2010 |