JP2011062807A5 - - Google Patents

Description

That is, the end mill according to the first aspect of the present invention is a cemented carbide end mill having a plurality of bottom blades and a plurality of outer peripheral blades, and a plurality of gashs consisting of a plurality of gash surfaces, the plurality of gash surfaces being bottom blades The first gash surface, which is a rake surface, intersects the first gash surface at an acute angle, continues at a second gash surface provided on the rotation center side of the tool axis of the end mill, and at an obtuse angle with the first gash surface. It continues crossing and it consists of the third gash surface provided on the outer peripheral side of the end mill and on the rear end side of the end mill from the second gash surface, and the length of the junction between the second and third gash surfaces is a tool and 5% or more than 20% of the tool diameter as the distance from the rotation axis, the plurality of outer circumferential blades, is unequal peripheral cutting edge adjacent to the circumferential direction of the end mill outer peripheral surface in the axis-perpendicular cross section of the end mill It is a cemented carbide end mill, characterized in that arranged at the split angle.

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In the present invention, the specific hard film is coated to further improve the characteristics and stabilize the life. That is, the end mill of the fifth invention, at least the plurality of end cutting edge and the peripheral cutting edge (TiAl) first to 3 N hard coating film obtained by containing Si in system is characterized in that it is covered in 1 is a cemented carbide end mill according to any of the present invention.

Claims (4)

A cemented carbide end mill comprising a plurality of bottom blades, a plurality of outer peripheral blades, and a plurality of gash surfaces comprising a plurality of gash surfaces, the plurality of gash surfaces being a first gush surface, which is a rake surface of the bottom blades, The first gash surface intersects at an acute angle and continues, and the second gash surface provided on the rotation center side of the tool axis of the end mill, and the first gash surface intersects at an obtuse angle, continues on the outer peripheral side of the end mill and the first It consists of the 3rd gash surface provided on the rear end side of the end mill than the 2 gash surface, and the length of the junction between the 2nd gash surface and the 3rd gash surface is 5% of the tool diameter as the distance from the tool rotation axis and more than 20%, the plurality of the peripheral cutting edge is characterized in that the peripheral cutting edge adjacent to the circumferential direction of the end mill outer peripheral surface in the axis-perpendicular cross section of the end mill are arranged in unequal division angle super Alloy end mill.   In the plurality of outer peripheral blades, the outer peripheral blades adjacent in the circumferential direction of the outer peripheral surface are arranged at unequal division angles in the axial right-angled sectional view of the end mill, and the division angle of the largest outer peripheral blade among the division angles of the plurality of outer peripheral blades The cemented carbide end mill according to claim 1, characterized in that a ratio of 2 to 20% is large with respect to an equal division angle obtained by dividing 360 ° by the number of outer peripheral blades.   An angle between the intersection of the first and second flush surfaces and a plane perpendicular to the tool axis is a plane perpendicular to the intersection of the first and third flush surfaces and the tool axis. The first gash angle is 15 ° to 35 °, and the second gash angle is 40 ° to 60 °, where the second gash angle is a second angle. Cemented carbide end mill. The cemented carbide end mill according to any one of claims 1 to 3 , wherein at least the bottom edge and the outer circumferential edge are coated with a hard coating in which Si is contained in a (TiAl) N system.