DRILL AND METHOD FOR MANUFACTURING CUT WORKPIECE

WIPO Patent Application WO/2021/020259

A1

A drill according to a non-limiting aspect of the present disclosure has a main body. The main body extends from a first end across to a second end. The main body has a first section, a second section, a step, a first blade, a first groove, a second blade, and a second groove. The second section is positioned closer to the second end side than the first section, and has a larger outer diameter than the first section. The step is positioned between the first section and the second section, and has an outer diameter gradually increasing toward the second section. The first groove extends from the first blade. The second blade is positioned spaced apart from the first groove. The second groove extends from the second blade. The step has a first step and a second step. The first step is connected to the first groove. The second step is connected to the second groove. The second blade is positioned at the second step. A first end section on the first end side in the first step is positioned spaced further apart from the first end than a second end section on the first end side in the second step.

JP2007038377	SURFACE-COATED CEMENTED-CARBIDE CUTTING TOOL WITH HARD COATING LAYER CAPABLE OF SHOWING EXCELLENT CHIPPING RESISTANCE IN HIGH SPEED CUTTING OF DIFFICULT-TO-CUT MATERIAL
WO/2010/025192	AUGER BIT WITH A REMOVABLE TIP
JP2023532505	Low-pressure internal water supply drill bit for thin wall processing

OGAWA HIROSHI (JP)

PCT/JP2020/028371

February 04, 2021

July 22, 2020

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KYOCERA CORP (JP)

B23B51/00; B23B51/08; B23D77/00

JPH0647619A	1994-02-22
JP2017202541A	2017-11-16
JP2017047486A	2017-03-09

BUNA PATENT ATTORNEYS (JP)

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