JPWO2019162946A5

JPWO2019162946A5 -

Info

Publication number: JPWO2019162946A5
Application number: JP2020539227A
Authority: JP
Publication date: 2022-01-20
Anticipated expiration: 2039-02-25

Claims

An end mill that has a single integrated structure, is configured for end face cutting and / or grooving applications, and rotates about a central rotation axis ( _AR ), said central rotation axis ( _AR ). , The forward direction (DF) and the backward direction ( _DR ) opposite to the axial direction, and the leading direction ( _DP ) and the trailing direction ( _DS ) opposite to the rotation are defined, and the preceding direction ( _D ) is defined. _P ) is the cutting direction, and the end mill is
Facing rear end faces and cutting end faces, and an outer peripheral surface extending between the rear end face and the cutting end face,
The shank portion extending forward from the rear end surface and
A cutting portion extending forward from the shank portion to the cutting end face is provided.
The cut part is
Diameter part ( _DE ) and
Effective cutting length ( _LE ) and
With multiple integrally formed teeth,
With a plurality of grooves alternating with the plurality of teeth,
At least one of the plurality of teeth is
The rake face and
Following the rake plane, a flank surface having a flank width that can be measured in a plane orthogonal to the rotation axis ( _AR ), and a flank surface.
A cutting edge formed at the line of intersection between the rake surface and the flank surface is provided.
The cutting edge is
The first secondary cutting edge extending rearward from the cutting end face,
The second secondary cutting edge extending rearward from the first secondary cutting edge,
It comprises an angle-shifting line of intersection that defines where the first secondary cutting edge ends and the second secondary cutting edge begins.
The first secondary cutting edge is
The first radial rake angle and
The first helix angle and
With a first clearance angle,
The second secondary cutting edge includes a second radial rake angle, a second helix angle, and a second clearance angle.
The angle transition intersection includes a line rake angle, a line twist angle, and a line clearance angle.
At least one of the plurality of grooves comprises a sub-groove, which extends posteriorly from the cutting end face, has a sub-groove boundary, and extends from the cutting edge of one tooth to the adjacent tooth. Prolonging in the forward direction toward
Regarding the cutting edge
The angle shift intersection is approximately located at the approximate position GL, which is an axial distance from the cutting end face as defined by the condition: _{0.20L E} _≤ GL ≤ 0.75LE. ,
The angle shift intersection is precisely located at the exact position PL in the approximate position GL, where the exact position PL is defined as the axial position closest to the cutting end face in the approximate position GL and the axis. The directional position is the first condition in which the line-of-line rake angle is greater than all of the line-of-line rake angles closer to the cutting end face, and the first twist in which the line-of-line twist angle directly precedes the line-of-line twist angle. An end mill that meets at least one of the second conditions, which is at least 5% larger than the angle.

The end mill according to claim 1, wherein the approximate position GL satisfies the condition 0.20L _E ≤ GL ≤ 0.50L _E.

The end mill according to claim 1 or 2, wherein both the first condition and the second condition are _satisfied within an axial separation distance LP of 0.15 _LE or less.

The end mill according to claim 3, wherein the axial separation distance _LP is 0.05 _LE or less.

The end mill according to claim 4, wherein the axial separation distance _LP is 0.02 _LE or less.

The end mill according to any one of claims 1 to 5, wherein the line-of-line rake angle is at least 20% larger than the first rake angle directly adjacent to the line-of-line rake angle.

The end mill according to claim 6, wherein the line-of-line rake angle is at least 30% larger than the first rake angle directly adjacent to the line-of-line rake angle.

The end mill according to any one of claims 1 to 7, wherein each of the first rake angles along the first secondary cutting edge has a positive value.

The end mill according to any one of claims 1 to 8, wherein each of the first rake angles of the first secondary cutting edge has the same value.

The end mill according to any one of claims 1 to 9, wherein the line of intersection twist angle is at least 10% larger than the first helix angle directly adjacent to the line of intersection twist angle.

The approximate position is located between the effective cutting lengths of 20% to 40% from the cutting end face, and each of the first twist angles along the first secondary cutting edge has the same value. Or, the approximate position is located between the effective cutting length portion of 40% to 75% from the cutting end face, and each of the first twist angles along the first secondary cutting edge is the angle. The end mill according to any one of claims 1 to 10, wherein the value decreases as the proximity to the transition intersection increases.

The line of intersection rake angle is larger than the first rake angle directly adjacent to the line of intersection rake angle, and the line of intersection clearance angle is larger than the first clearance angle directly adjacent to the line of intersection clearance angle. The small end mill according to any one of claims 1 to 11.

The end mill according to any one of claims 1 to 12, wherein the visible flank interruption is formed along the first secondary cutting edge.

The end mill according to any one of claims 1 to 13, wherein the first clearance angle gradually increases from the cutting end face in the rear direction toward the angle transition intersection.

Any one of claims 1 to 13, wherein each measurable internal tooth angle between the rake face and the flank at each axial position along the first secondary cutting edge has the same value. The end mill described in the section.

The end mill according to claim 1 , wherein the sub-groove boundary is separated from the flank of the second tooth.

The value of the first helix angle of the cutting edge fluctuates as the distance from the cutting end surface to the angle transition intersection increases, and the second helix angle of the cutting edge is the angle transition intersection. The end mill according to any one of claims 1 to 16 , which has the same value when the distance from the effective cutting length portion to the end portion is increased.

Further cutting edges of the plurality of teeth other than the cutting edge already defined have a first helix angle whose value fluctuates as the distance from the cutting end face to the angle transition intersection increases, and the second cutting angle. The second helix of the further cutting edge, having a second helix angle having the same value as the distance from the angle transition intersection of the blade to the end of the effective cutting length portion increases. The end mill according to any one of claims 1 to 17 , wherein the angle is different from the second helix angle of the cutting edge already defined.

The end mill according to any one of claims 1 to 18 , wherein the end mill has at least 5 teeth, and the two non-adjacent teeth have the same cutting edge as the cutting edge of the at least one tooth.