JP7043933B2 - Cutting edge position adjustment mechanism and milling tool - Google Patents

Description

The present invention relates to a cutting edge position adjusting mechanism and a rolling tool.

Conventionally, a milling cutter with a replaceable cutting edge of Patent Document 1 is known. The replaceable cutting edge milling cutter includes a tool body that can be rotated around an axis, a plurality of milling inserts, and a plurality of adjustment mechanisms. The adjusting mechanism adjusts the axial position of the milling insert.
The adjusting mechanism includes a shaft member screwed into the screw hole of the tool body in parallel with the axis line, and a nut member screwed into a screw portion (second screw portion) directed toward the tip end side of the shaft member. The nut member contacts the milling insert from the rear end side in the axial direction and presses the milling insert toward the tip side.

Japanese Unexamined Patent Publication No. 2015-27707

In this type of rolling tool, the upper limit (maximum rotation speed) of the tool rotation speed at the time of cutting may be determined according to the durability of the adjusting portion (adjusting mechanism). That is, the maximum rotation speed during use is limited so that the adjusting portion is not deformed by the action of centrifugal force during cutting.

In view of the above circumstances, one of the objects of the present invention is to provide a cutting edge position adjusting mechanism and a milling tool capable of improving the durability of the adjusting portion and increasing the upper limit of the tool rotation speed. ..

One aspect of the position adjusting mechanism of the cutting edge portion of the present invention is a cutting edge portion arranged on the outer peripheral portion of the tip of the tool body rotated around the central axis, and the cutting edge portion arranged on the outer peripheral portion of the tool body. The cutting edge portion includes an adjusting portion that presses the portion toward the tip end side in the axial direction , which is the direction in which the central axis extends, and adjusts the axial position of the cutting edge portion. It has a centrifugal force receiving portion that can support inward in the radial direction , the center line of the adjusting portion extends along the axial direction, and the cutting edge portion extends along the axial direction with respect to the tool body. Slide to move .
Further, one aspect of the milling tool of the present invention is a tool body that is rotated around a central axis, and a plurality of cutting edge portions that are arranged at intervals in the circumferential direction on the outer peripheral portion of the tip of the tool body. , Are arranged on the outer periphery of the tool body at intervals in the circumferential direction, and press the cutting edge portion toward the tip end side in the axial direction in which the central axis extends, in the axial direction of the cutting edge portion. The cutting edge portion includes a plurality of adjusting portions for adjusting the position, and the cutting edge portion has a centrifugal force receiving portion capable of supporting the adjusting portion inward in the radial direction , and the center line of the adjusting portion is the axis. Extending along the direction, the cutting edge portion slides and moves along the axial direction with respect to the tool body .

According to the position adjusting mechanism of the cutting edge portion and one aspect of the rolling tool of the present invention, the centrifugal force receiving portion of the cutting edge portion can support the adjusting portion inward in the radial direction. Therefore, even if a large centrifugal force (force toward the radial outer side of the tool) acts on the adjusting part during cutting, the centrifugal force receiving part supports the adjusting part toward the radial inward side of the adjusting part. Deformation etc. are suppressed. As a result, the durability (rigidity) of the adjusting portion is improved, and the upper limit (maximum rotation speed) of the tool rotation speed during cutting can be increased. Since the maximum rotation speed is increased, the tool can be used more safely. In addition, the range of tool rotation speeds that can be used is expanded, and various machining conditions can be met.

In the position adjusting mechanism of the cutting edge portion, the center line of the adjusting portion extends along the axial direction, and the cutting edge portion slides and moves along the axial direction with respect to the tool body .

In this case, when a centrifugal force acts on the adjusting portion during cutting, the durability of the adjusting portion is more likely to be affected. According to one aspect of the present invention, even in the above configuration, deformation of the adjusting portion and the like can be suppressed, and the maximum rotation speed of the tool can be increased.

In the position adjusting mechanism of the cutting edge portion, the centrifugal force receiving portion may be in contact with the adjusting portion in the radial direction.
In the position adjusting mechanism of the cutting edge portion, the centrifugal force receiving portion may face the adjusting portion with a radial gap.

The centrifugal force receiving portion may be capable of supporting the adjusting portion inward in the radial direction when a centrifugal force acts on the adjusting portion. Therefore, the centrifugal force receiving portion may be in contact with the adjusting portion in the radial direction, or may be arranged so as to face each other with a gap in the radial direction.

When the centrifugal force receiving portion comes into contact with the adjusting portion, this centrifugal force receiving portion can also be used as a pressed surface that receives a pressing force toward the axial tip side of the adjusting portion. Therefore, it is easy to simplify the structure of the cutting edge portion.

When the centrifugal force receiving portion faces the adjusting portion with a gap, the centrifugal force receiving portion comes into contact with the adjusting portion when a centrifugal force of a predetermined value or more acts on the adjusting portion. In this case, the cutting edge portion can be separately provided with a pressed surface that receives a pressing force from the adjusting portion toward the tip side in the axial direction and a centrifugal force receiving portion, and each function can be further stabilized. ..

In the position adjusting mechanism of the cutting edge portion, the adjusting portion has a shaft member supported by the tool body and a nut member screwed to the shaft member and in contact with the cutting edge portion. By adjusting the screwing amount of the nut member with respect to the shaft member, the axial position of the cutting edge portion is adjusted, and the centrifugal force receiving portion can support the nut member inward in the radial direction. Is preferable.

In this case, when a centrifugal force acts on the nut member during cutting, the centrifugal force receiving portion supports the nut member inward in the radial direction. As a result, the durability of the adjusting portion is improved, and the maximum rotation speed during cutting can be increased.

In the position adjusting mechanism of the cutting edge portion, the nut member has a convex tapered surface whose diameter is reduced toward the tip end surface of the nut member, and the centrifugal force receiving portion is the cutting edge portion. It is preferably an inclined surface that is arranged on the rear end surface and extends inward in the radial direction toward the tip side, and is in contact with the convex tapered surface.

In this case, the centrifugal force receiving portion is an inclined surface arranged on the rear end surface of the cutting edge portion. The above-mentioned effects can be obtained while the centrifugal force receiving portion has a simple structure.

In the position adjusting mechanism of the cutting edge portion, the cutting edge portion has a contact portion located radially inside the centrifugal force receiving portion on the rear end surface of the cutting edge portion, and the contact portion is on the tip side. It is preferable that the inclined surface extends outward in the radial direction as it goes toward the surface and comes into contact with the convex tapered surface.

In this case, the contact portion functions as a part of the pressed surface that receives the pressing force from the adjusting portion toward the tip side in the axial direction. As a result, the pressing force from the adjusting portion can be received in a wide range (multiple locations) on the rear end surface of the cutting edge portion. Therefore, the pressing balance from the nut member to the cutting edge portion is stable.

In the position adjusting mechanism of the cutting edge portion, the centrifugal force receiving portion is a vertical wall surface arranged at the rear end portion of the cutting edge portion and facing inward in the radial direction, and the nut member is a tip portion of the nut member. In addition, the pillar portion has a pillar portion extending in the axial direction, and the pillar portion has a tip pressing surface in contact with the rear end surface of the cutting edge portion and a peripheral wall surface facing the centrifugal force receiving portion from the inside in the radial direction. It is preferable to have.

In this case, the cutting edge portion receives a pressing force from the adjusting portion toward the tip end side in the axial direction on the rear end surface. Further, when a centrifugal force directed outward in the radial direction acts on the adjusting portion, the cutting edge portion receives this centrifugal force at the centrifugal force receiving portion. That is, since the portion of the cutting edge portion that receives the pressing force and the portion that receives the centrifugal force are separately provided, the cutting edge portion can stably receive the pressing force and the centrifugal force, respectively.

In the position adjusting mechanism of the cutting edge portion, the cutting edge portion has a protrusion located radially inside the centrifugal force receiving portion at the rear end portion of the cutting edge portion, and the protrusion portion is described as described above. It is preferable to face the peripheral wall surface from the inside in the radial direction.

In this case, the pillar portion of the nut member is arranged so as to be sandwiched between the centrifugal force receiving portion and the protrusion portion of the cutting edge portion from both sides in the radial direction. Therefore, the assembling posture of the nut member and the cutting edge portion is stable.

In the position adjusting mechanism of the cutting edge portion, the cutting edge portion has a recess recessed from the rear end surface of the cutting edge portion toward the tip end side, and the centrifugal force receiving portion is radially inside of the inner surface of the recess. The nut member faces the tip end portion of the nut member, has a pressing surface facing the tip end side and is in contact with the rear end surface of the cutting edge portion, and a protrusion protruding toward the tip end side from the pressing surface. It is preferable that the convex portion is located in the concave portion and faces the centrifugal force receiving portion from the inside in the radial direction.

In this case, the cutting edge portion receives a pressing force from the adjusting portion toward the tip end side in the axial direction on the rear end surface. Further, when a centrifugal force directed outward in the radial direction acts on the adjusting portion, the cutting edge portion receives this centrifugal force at the centrifugal force receiving portion. That is, the centrifugal force receiving portion of the concave portion can support the convex portion inward in the radial direction. Since the portion of the cutting edge portion that receives the pressing force and the portion that receives the centrifugal force are separately provided, the cutting edge portion can stably receive the pressing force and the centrifugal force.

In the position adjusting mechanism of the cutting edge portion, the nut member has a concave tapered surface whose diameter is reduced toward the rear end side on the tip surface of the nut member, and the centrifugal force receiving portion is the cutting edge. It is preferable that the portion is arranged on the rear end surface of the portion and has a tapered shape whose diameter is reduced toward the rear end side so as to be in contact with the concave tapered surface.

In this case, since the convex tapered centrifugal force receiving portion comes into contact with the concave tapered surface of the nut member, the above-mentioned action and effect of the centrifugal force receiving portion can be obtained, and the assembling posture of the nut member and the cutting edge portion is stable. do. Further, the pressing force from the adjusting portion can be received in a wide range of the rear end surface of the cutting edge portion. Therefore, the pressing balance from the nut member to the cutting edge portion is stable.

According to the position adjusting mechanism of the cutting edge portion and the rolling tool according to one aspect of the present invention, the durability of the adjusting portion can be improved and the upper limit of the tool rotation speed can be increased.

It is a bottom view of the cutting edge exchange type milling cutter of one Embodiment of this invention. It is a side view of the cutting edge exchange type milling cutter of one Embodiment of this invention. It is a vertical cross-sectional view of the cutting edge exchange type milling cutter of one Embodiment of this invention. It is a front view which shows the position adjustment mechanism of the cutting edge part of one Embodiment of this invention. 4 is a perspective view showing (a) a nut member and (b) a perspective view showing a shaft member of the adjusting portion of FIG. 4. It is a perspective view which shows the cutting edge part of FIG. It is a front view which shows the position adjustment mechanism of the cutting edge part of the 1st modification. It is a perspective view which shows the cutting edge part of FIG. It is a front view which shows the position adjustment mechanism of the cutting edge part of the 2nd modification. 9 is a perspective view showing (a) a nut member and (b) a perspective view showing a shaft member of the adjusting portion of FIG. 9. It is a perspective view which shows the cutting edge part of FIG. It is a front view which shows the position adjustment mechanism of the cutting edge part of the 3rd modification. It is a perspective view which shows the cutting edge part of FIG. It is a front view which shows the position adjustment mechanism of the cutting edge part of the 4th modification. It is a perspective view which shows the cutting edge part of FIG. It is a front view which shows the position adjustment mechanism of the cutting edge part of the 5th modification. 16 is a perspective view showing (a) a nut member and (b) a perspective view showing a shaft member of the adjusting portion of FIG. 16. It is a perspective view which shows the cutting edge part of FIG.

Hereinafter, the blade edge exchange type milling cutter 1 which is an example of the milling tool according to the embodiment of the present invention and the cutting edge position adjusting mechanism 20 provided in the blade edge exchange type milling cutter 1 will be described with reference to the drawings. do.

[Rough configuration of replaceable cutting edge type milling cutter and cutting edge position adjustment mechanism]
The cutting edge exchange type milling cutter 1 of the present embodiment is a milling tool (cutting tool) for milling a work material such as a metal material. In the milling cutter 1 with a replaceable cutting edge, the work material is mainly subjected to milling processing (cutting processing) such as front surface cutting. The face milling is a milling cutter that forms a machined surface perpendicular to the central axis O of the tool body 2 with respect to the work material.

As shown in FIGS. 1 to 6, the position adjusting mechanism 20 of the cutting edge portion includes a cutting edge portion 30 and an adjusting portion 50.
Further, the blade tip exchange type milling cutter 1 includes a tool body 2, a plurality of cutting edge portions 30, and a plurality of adjusting portions 50.

The tool body 2 has a substantially cylindrical shape centered on the central axis O. The tool body 2 is mounted on a spindle of a machine tool (not shown) and is rotated around the central axis O by the spindle.
A plurality of cutting edge portions 30 are arranged on the outer peripheral portion of the tip of the tool body 2 at intervals in the circumferential direction. The cutting edge portion 30 is called a cutting insert or a cutting tip. The cutting edge portion 30 is detachably attached to the outer peripheral portion of the tip of the tool body 2. A plurality of insert mounting seats 4 are provided on the outer peripheral portion of the tip of the tool body 2 at intervals in the circumferential direction. Each cutting edge portion 30 is detachably attached to each insert mounting seat 4.

The cutting edge portion 30 has a cutting edge 7. The cutting edge portion 30 attached to the insert mounting seat 4 is arranged such that the cutting edge portion 7 projects toward the tip end side and the radial outer side with respect to the tool body 2.
In the blade tip exchange type milling cutter 1 of the present embodiment, the insert mounting seat 4 is provided in the tool body 2 at 10 or more locations (for example, 20 locations) at intervals in the circumferential direction, and the cutting edge portion 30 is also provided in the insert mounting seat 4. 10 or more (for example, 20) are provided in the same number as the number of. The blade tip exchange type milling cutter 1 is a so-called multi-blade type milling cutter.

The upper portion of the tool body 2 of the milling cutter 1 having a replaceable cutting edge is attached to the spindle of the machine tool. In the blade tip exchange type milling cutter 1, the tool body 2 is rotated by the spindle in the tool rotation direction T around the central axis O, and is moved in a direction intersecting the central axis O (for example, in a direction orthogonal to the central axis O). Then, the work material is milled by the cutting blades 7 of the plurality of cutting edge portions 30 mounted on the tool body 2.

[Definition of orientation (direction) used in this embodiment]
In the present embodiment, the direction along the central axis O of the tool body 2 (the direction in which the central axis O extends) is referred to as an axial direction. Of the axial directions, the direction from the mounting portion 5 of the tool body 2 mounted on the spindle of the machine tool toward the insert mounting seat 4 and the cutting edge portion 30 is called the tip side, and is from the insert mounting seat 4 and the cutting edge portion 30. The direction toward the mounting portion 5 is called the rear end side.
The direction orthogonal to the central axis O is called the radial direction. Of the radial directions, the direction closer to the central axis O is called the inner side in the radial direction, and the direction away from the central axis O is called the outer side in the radial direction.
The direction that orbits around the central axis O is called the circumferential direction. Of the circumferential directions, the direction in which the tool body 2 is rotated by the spindle of the machine tool during cutting is called the tool rotation direction T, and the rotation direction opposite to this is the direction opposite to (or opposite to) the tool rotation direction T. Tool rotation direction).

[Explanation of tool body 1]
The tool main body 2 has an outer main body portion 21, an inner main body portion 22, a space portion 23, and a coolant hole 3. Further, the tool body 2 has a tip pocket 6, an insert mounting seat 4, a support portion 24, and a recessed portion 25. The tip pocket 6, the insert mounting seat 4, the support portion 24, and the recessed portion 25 are arranged in the outer main body portion 21.

As shown in FIG. 3, the outer main body portion 21 has a bottomed cylindrical shape. The outer main body portion 21 has a peripheral wall and a bottom wall. The outer main body portion 21 is made of, for example, a steel material.
The inner main body portion 22 is substantially columnar. The inner main body 22 is arranged inside the outer main body 21. That is, the inner main body portion 22 has a portion located inside the outer main body portion 21. The inner main body portion 22 is made of, for example, an aluminum material. The specific gravity of the inner main body portion 22 is smaller than the specific gravity of the outer main body portion 21.

The inner main body portion 22 has a cylindrical portion 22a and a flange portion 22b.
A mounting portion 5 is formed on the rear end surface (upper surface) of the cylindrical portion 22a. The mounting portion 5 is a hole that opens in the rear end surface of the cylindrical portion 22a and is recessed from the rear end surface to the tip end side. The spindle of the machine tool is inserted into the mounting portion 5.
The flange portion 22b extends radially outward from the rear end portion (upper end portion) of the cylindrical portion 22a. The flange portion 22b has a circular ring plate shape. The front end surface (lower surface) of the flange portion 22b faces the rear end surface (upper surface) of the peripheral wall of the outer main body portion 21.

Of the outer peripheral surface of the cylindrical portion 22a, the portion adjacent to the tip end side of the flange portion 22b fits in the rear end opening of the peripheral wall of the outer main body portion 21.
Of the front end surfaces of the cylindrical portion 22a, the outer peripheral end portion and the inner peripheral end portion come into contact with the rear end surface of the bottom wall of the outer main body portion 21 from the rear end side. The columnar portion 22a and the bottom wall of the outer main body portion 21 are fastened by a screw member 40 and fixed to each other.

The space portion 23 is located between the outer main body portion 21 and the inner main body portion 22. The space portion 23 is a lightening space provided inside the tool body 2. The space portion 23 has a first space portion 23a and a second space portion 23b.

The first space portion 23a is arranged between the peripheral wall of the outer main body portion 21 and the outer peripheral surface of the cylindrical portion 22a. The first space portion 23a is a cylindrical space centered on the central axis O.
The second space portion 23b is arranged between the bottom wall of the outer main body portion 21 and the tip surface of the cylindrical portion 22a. The second space portion 23b is a circular ring-shaped space centered on the central axis O. The second space portion 23b is located between the outer peripheral end portion and the inner peripheral end portion of the tip surface of the cylindrical portion 22a. The second space portion 23b constitutes a part of the flow path of the coolant hole 3.

The coolant hole 3 extends inside the tool body 2. The coolant hole 3 penetrates the tool body 2. Coolant (cutting liquid) supplied through the spindle of the machine tool circulates inside the coolant hole 3. The coolant hole 3 has a first coolant hole 3a, a second coolant hole 3b, and a second space portion 23b.

The first coolant hole 3a penetrates the inner main body portion 22. The first coolant hole 3a opens on the inner peripheral surface of the mounting portion 5 and the tip end surface of the cylindrical portion 22a. The tip of the first coolant hole 3a is connected to the second space portion 23b. A plurality (for example, four) of the first coolant holes 3a are provided at intervals in the circumferential direction.
The second coolant hole 3b penetrates the outer main body portion 21. The second coolant hole 3b opens on the rear end surface of the bottom wall of the outer main body 21 and the outer peripheral surface of the peripheral wall. The rear end portion of the second coolant hole 3b is connected to the second space portion 23b. The tip end portion (diametrically outer end portion) of the second coolant hole 3b opens into the tip pocket 6. The tip of the second coolant hole 3b opens toward the cutting edge 7 of the cutting edge portion 30. A plurality of second coolant holes 3b are provided at intervals in the circumferential direction. The number of the second coolant holes 3b is the same as the number of the tip pockets 6 and the number of the cutting edge portions 30 (for example, 20).

As shown in FIGS. 1 and 2, a plurality of tip pockets 6 are provided on the outer peripheral portion of the tip of the tool main body 2 (outer main body portion 21) at intervals in the circumferential direction. The tip pocket 6 is formed by being recessed in the outer peripheral portion of the tip of the tool body 2.
The insert mounting seat 4 is arranged adjacent to the outer peripheral portion of the tip of the tool main body 2 (outer main body portion 21) in a direction opposite to the tool rotation direction T of the tip pocket 6. In other words, the tip pocket 6 is arranged adjacent to the insert mounting seat 4 in the tool rotation direction T. The insert mounting seat 4 has a rectangular hole shape or a groove shape, corresponding to the shape of the cutting edge portion 30.
A detailed description of the insert mounting seat 4 and a description of parts other than the above of the tool body 2 will be described later.

[Cutting edge]
As shown in FIG. 6, the cutting edge portion 30 is a face milling insert used for, for example, face milling (front milling). As the plurality of cutting edge portions 30 mounted on the tool body 2, only one type having the same shape of the cutting edge 7 may be used, or a plurality of types having different shapes of the cutting edge 7 may be used. You may.
The cutting edge portion 30 extends along the intersecting ridge line between the insert main body 31 attached to the insert mounting seat 4 of the tool main body 2 and the rake face 32 and the flank surface 33 of the insert main body 31, and extends to the outer peripheral portion of the tip of the insert main body 31. It has a cutting edge 7 to be arranged.

The insert body 31 has a polygonal plate shape. In the example of this embodiment, the insert body 31 has a rectangular plate shape. When the cutting edge portion 30 is mounted on the insert mounting seat 4, the longitudinal direction of the rectangular surface (front surface and back surface) of the insert body 31 is arranged along the axial direction of the tool body 2 (see FIG. 2). Further, the rectangular surface of the insert body 31 is arranged along the radial direction of the tool body 2 in the lateral direction (see FIG. 1).

The insert main body 31 has a rectangular plate-shaped base metal portion 34 and a triangular plate-shaped blade portion 35 joined to one corner portion of the base metal portion 34 to form a cutting blade 7.
The base metal portion 34 is made of, for example, a cemented carbide. The blade portion 35 is made of an ultra-high pressure sintered body such as a diamond sintered body or a cBN sintered body having a hardness higher than that of the base metal portion 34. However, the present invention is not limited to this, and the entire insert main body 31 including the base metal portion 34 and the blade portion 35 is made of, for example, cemented carbide, and may be integrally formed of a single member.

In the present embodiment, the blade portion 35 is arranged at one corner portion of one polygonal surface (front surface) of the pair of polygonal surfaces (rectangular surfaces) constituting the front surface and the back surface of the insert main body 31. , It is joined to the base metal portion 34 by brazing, integral sintering, or the like. The corner portion is a corner portion located on the outer peripheral portion of the tip of the cutting edge replaceable milling cutter 1 when the cutting edge portion 30 is mounted on the insert mounting seat 4.

A clamp recess 37 recessed in the thickness direction from the polygonal surface is formed on one polygonal surface of the base metal portion 34. In the example of the present embodiment, the clamp recess 37 has a D-shape in a plan view of the cutting edge portion 30 from the thickness direction. However, the clamp recess 37 is not limited to a D shape in a plan view. The depth of the clamp recess 37 becomes deeper from the end opposite to the blade portion 35 toward the blade portion 35 side along the lateral direction of the insert main body 31. That is, the bottom surface of the clamp recess 37 is an inclined surface. When the cutting edge portion 30 is mounted on the insert mounting seat 4, the bottom surface of the clamp recess 37 extends outward in the radial direction in the direction opposite to the tool rotation direction T.

On one polygonal surface of the base metal portion 34, a rib 38 protruding in the thickness direction from the polygonal surface is formed in a portion located between the clamp recess 37 and the blade portion 35. In the plan view of the cutting edge portion 30, the rib 38 extends linearly substantially parallel to the hypotenuse of the cutting edge portion 35 forming a substantially right-angled triangular shape. The rib 38 is arranged so as to face the blade portion 35 from the longitudinal direction and the lateral direction of the insert main body 31. Therefore, when the cutting edge portion 30 is mounted on the insert mounting seat 4, the rib 38 is arranged to face the cutting edge 7 from the rear end side in the axial direction and from the inside in the radial direction. .. Chips generated by cutting the work material by the cutting edge 7 come into contact with the ribs 38.

As shown in FIG. 1, the thickness of the cutting edge portion 30 increases from the cutting edge portion 35 toward the end portion on the opposite side of the cutting edge portion 35 along the lateral direction of the insert main body 31. That is, when the cutting edge portion 30 is mounted on the insert mounting seat 4, the thickness of the cutting edge portion 30 increases inward in the radial direction.

As shown in FIG. 2, when the cutting edge portion 30 is mounted on the insert mounting seat 4, the axial rake (axial rake angle) of the cutting edge 7 is a positive angle.
In FIG. 6, the portion of the cutting blade 7 extending in the lateral direction of the insert main body 31 is the front blade 7a. The front blade 7a has a linear shape. The front blade 7a is not limited to a straight line, but may be, for example, a convex curve having a large radius of curvature. When the cutting edge portion 30 is mounted on the insert mounting seat 4, the front blade 7a projects from the insert mounting seat 4 toward the tip end side of the tool body 2.
The portion of the cutting edge 7 extending in the longitudinal direction of the insert body 31 is the outer peripheral blade 7b. The outer peripheral blade 7b has a linear shape. When the cutting edge portion 30 is mounted on the insert mounting seat 4, the outer peripheral blade 7b projects from the insert mounting seat 4 toward the radial outer side of the tool body 2.
The portion of the cutting blade 7 located between the front blade 7a and the outer peripheral blade 7b is the corner blade 7c. The corner blade 7c has a convex curve or a straight line. When the cutting edge portion 30 is mounted on the insert mounting seat 4, the corner blade 7c protrudes from the insert mounting seat 4 toward the outer peripheral side of the tip of the tool body 2.

As shown in FIGS. 4 and 6, the cutting edge portion 30 has a centrifugal force receiving portion 36. The centrifugal force receiving portion 36 can support the adjusting portion 50 inward in the radial direction. The centrifugal force receiving portion 36 can support the nut member 52 described later of the adjusting portion 50 inward in the radial direction. The centrifugal force receiving portion 36 receives the centrifugal force (force toward the radial outer side of the tool) acting on the adjusting portion 50 during cutting from the radial outer side. A detailed description of the adjusting unit 50 will be described later.

The centrifugal force receiving portion 36 is arranged at the rear end portion of the cutting edge portion 30 (insert main body 31). The centrifugal force receiving portion 36 is provided at the rear end portion of the cutting edge portion 30, and can support the tip portion of the adjusting portion 50 inward in the radial direction. In the present embodiment, the centrifugal force receiving portion 36 comes into radial contact with the adjusting portion 50. The centrifugal force receiving portion 36 comes into contact with the adjusting portion 50 from the outside in the radial direction. In the example of this embodiment, the centrifugal force receiving portion 36 also comes into contact with the adjusting portion 50 in the axial direction. The centrifugal force receiving portion 36 comes into contact with the adjusting portion 50 from the tip side.

Specifically, the centrifugal force receiving portion 36 is arranged on the rear end surface 30a of the cutting edge portion 30 (insert main body 31). The rear end surface 30a is an inclined surface extending toward the tip side as it goes inward in the radial direction. Therefore, the centrifugal force receiving portion 36 is also an inclined surface extending toward the tip end side inward in the radial direction. In other words, the centrifugal force receiving portion 36 is an inclined surface extending inward in the radial direction toward the tip end side. The centrifugal force receiving portion 36 is located radially outside the center line C of the adjusting portion 50 described later. The centrifugal force receiving portion 36 is located at the radial outer end portion of the rear end surface 30a.

[Explanation of tool body 2]
The insert mounting seat 4 of the tool body 2 will be described in detail.
As shown in FIGS. 1 to 3, the insert mounting seat 4 opens in the tip surface and the outer peripheral surface of the tool body 2 and extends in the axial direction. The insert mounting seat 4 is located at the first wall surface 8 facing the direction opposite to the tool rotation direction T, the second wall surface 9 facing the tool rotation direction T, and the radial inner end of the insert mounting seat 4. It has a third wall surface 10 facing outward in the radial direction, and a clamp screw hole 11.

As shown in FIG. 1, in the example of the present embodiment, the first wall surface 8 has a planar shape extending along a virtual plane (not shown) including the central axis O of the tool body 2, and the third wall surface 10 has a third wall surface. 1 It is a plane shape that is substantially orthogonal to the wall surface 8. Further, the second wall surface 9 extends in the tool rotation direction T as it goes outward in the radial direction. Therefore, the distance between the second wall surface 9 and the first wall surface 8 (the width in the circumferential direction of the insert mounting seat 4) becomes smaller as it goes outward in the radial direction.

The cutting edge portion 30 is inserted toward the rear end side in the axial direction with respect to the insert mounting seat 4. When the cutting edge portion 30 is inserted into the insert mounting seat 4, the surface (one polygonal surface) of the cutting edge portion 30 facing in the thickness direction comes into contact with the first wall surface 8. When the cutting edge portion 30 is fixed with the clamp screw 19 as described later, a slight gap is provided between the surface of the cutting edge portion 30 facing in the thickness direction and the first wall surface 8. The back surface (the other polygonal surface) of the cutting edge portion 30 facing the thickness direction comes into contact with the second wall surface 9. The side surface of the cutting edge portion 30 facing the lateral side comes into contact with the third wall surface 10. The cutting edge portion 30 is sandwiched between the first wall surface 8 and the second wall surface 9 from the circumferential direction.

In the example of the present embodiment, as described above, the width of the insert mounting seat 4 in the circumferential direction becomes smaller as it goes outward in the radial direction, so that the cutting edge portion 30 inserted into the insert mounting seat 4 is the insert mounting seat. Movement to the outside in the radial direction with respect to 4 is suppressed. That is, the cutting edge portion 30 is prevented from coming out from the insert mounting seat 4 to the outside in the radial direction.
The cutting edge portion 30 slides and moves along the axial direction with respect to the insert mounting seat 4. That is, the cutting edge portion 30 slides and moves along the axial direction with respect to the tool body 2.

The clamp screw hole 11 opens in the outer peripheral surface (tip pocket 6) of the tool body 2 and the first wall surface 8. A female screw portion is formed on the inner peripheral surface of the clamp screw hole 11. The clamp screw hole 11 extends inward in the radial direction according to the direction opposite to the tool rotation direction T. A clamp screw 19 is screwed into the clamp screw hole 11 (see FIG. 2). The tip of the clamp screw 19 comes into contact with the bottom surface of the clamp recess 37 of the cutting edge portion 30. By screwing the clamp screw 19 into the clamp screw hole 11, the cutting edge portion 30 is fixed to the insert mounting seat 4.

[Adjustment section]
As shown in FIG. 2, a plurality of adjusting portions 50 are arranged on the outer periphery of the tool main body 2 (outer main body portion 21) at intervals in the circumferential direction. The adjusting portion 50 presses the cutting edge portion 30 toward the tip end side in the axial direction, and adjusts the position of the cutting edge portion 30 in the axial direction. The adjusting unit 50 adjusts the axial position of the cutting edge 7 by adjusting the axial position of the cutting edge portion 30 with respect to the tool body 2. The number of adjusting portions 50 is the same as the number of cutting edge portions 30, and in the example of the present embodiment, 10 or more adjusting portions 50 (for example, 20) are provided on the outer periphery of the tool body 2.

As shown in FIGS. 3 to 5, the adjusting unit 50 includes a shaft member 51 and a nut member 52.
The shaft member 51 is supported by the tool body 2. The shaft member 51 is screwed to the tool body 2. The nut member 52 is screwed to the shaft member 51 and comes into contact with the cutting edge portion 30.

As shown in FIG. 3, the center line C of the shaft member 51 extends along the axial direction of the tool body 2. That is, the center line C of the adjusting portion 50 extends along the axial direction. The direction in which the center line C of the shaft member 51 extends corresponds to the axial direction of the tool body 2. The shaft member 51 is rotated around the center line C with respect to the tool body 2 (support portion 24), and is moved in the axial direction with respect to the tool body 2 by the action of the screw. The nut member 52 is rotated around the center line C with respect to the shaft member 51 and the tool body 2, so that the nut member 52 moves in the axial direction with respect to the shaft member 51 and the tool body 2 by the action of the screw.

As shown in FIG. 5B, the shaft member 51 includes a first screw shaft 53 located at the rear end portion of the shaft member 51, a second screw shaft 54 located at the tip end portion, and a first screw shaft along the axial direction. It has an operation unit 55 located between the screw shaft 53 and the second screw shaft 54.
The outer diameter of the first screw shaft 53 is larger than the outer diameter of the second screw shaft 54. Male threaded portions are formed on the outer peripheral surface of the first screw shaft 53 and the outer peripheral surface of the second screw shaft 54, respectively. The male screw portion of the first screw shaft 53 and the male screw portion of the second screw shaft 54 have different screw pitches from each other. Specifically, the pitch of the screw of the male screw portion of the first screw shaft 53 is larger than the pitch of the screw of the male screw portion of the second screw shaft 54.

The operation unit 55 has a columnar shape or a disk shape. The outer diameter of the operation unit 55 is larger than the outer diameter of the first screw shaft 53 and the outer diameter of the second screw shaft 54. A shaft operation hole 55a opens on the outer peripheral surface of the operation unit 55. A plurality of shaft operation holes 55a are provided on the outer peripheral surface of the operation unit 55 at intervals around the center line C (for example, four at equal intervals). As shown in FIG. 3, the shaft operation hole 55a extends in a direction orthogonal to the center line C. In the example of the present embodiment, the shaft operation hole 55a is formed so as to penetrate the operation portion 55 in the direction orthogonal to the center line C. A work tool such as a wrench (not shown) is inserted into the shaft operation hole 55a.

As shown in FIG. 5A, the nut member 52 has a cylindrical shape or a circular ring plate shape centered on the center line C. The outer diameter of the nut member 52 is larger than the outer diameter of the shaft member 51. A female screw portion is formed on the inner peripheral surface of the nut member 52. The nut member 52 is screwed to the second screw shaft 54. A nut operation hole 52a opens on the outer peripheral surface of the nut member 52. A plurality of nut operation holes 52a (for example, five at equal intervals) are provided on the outer peripheral surface of the nut member 52 at intervals around the center line C. The nut operation hole 52a extends in a direction orthogonal to the center line C. In the example of this embodiment, the nut operation hole 52a is a stop hole having a bottom portion. A work tool such as a wrench (not shown) is inserted into the nut operation hole 52a.

The nut member 52 has the largest outer diameter in the adjusting portion 50. Therefore, as shown in FIG. 3, in the adjusting portion 50 attached to the tool body 2, the radial outer end located most radially outside the tool body 2 is a portion of the outer peripheral surface of the nut member 52. The radial position of the radial outer end of the adjusting portion 50 is inside the radial position of the radial outer end (outer peripheral blade 7b) of the cutting edge portion 30.

The front end surface of the nut member 52 comes into contact with the rear end surface of the cutting edge portion 30 from the rear end side.
Therefore, when the clamp screw 19 is loosened or temporarily tightened, either the screwing amount of the shaft member 51 with respect to the tool body 2 or the screwing amount of the nut member 52 with respect to the shaft member 51 is adjusted to cut. The axial position of the blade portion 30 is adjusted. That is, by operating the work tool to rotate either the shaft member 51 or the nut member 52 around the center line C, the cutting edge portion 30 and the cutting edge 7 are axially oriented with respect to the insert mounting seat 4. The position of is adjustable. After adjusting the position of the cutting edge portion 30, the cutting edge portion 30 is fixed to the insert mounting seat 4 by screwing in the clamp screw 19 and finally tightening the clamp screw 19. In the state where the clamp screw 19 is fully tightened, the shaft of the cutting edge portion 30 is adjusted by adjusting either the screwing amount of the shaft member 51 with respect to the tool body 2 or the screwing amount of the nut member 52 with respect to the shaft member 51. The position of the direction may be fine-tuned.

As shown in FIGS. 4 and 5A, the nut member 52 has a convex tapered surface 52b on the tip end surface of the nut member 52 whose diameter is reduced toward the tip end side. The convex tapered surface 52b has a conical surface shape. The convex tapered surface 52b is a circular ring extending over the entire circumference around the center line C on the tip surface of the nut member 52. The convex tapered surface 52b comes into contact with the centrifugal force receiving portion 36 of the cutting edge portion 30. The centrifugal force receiving portion 36 supports the convex tapered surface 52b toward the inside in the radial direction. The centrifugal force receiving portion 36 comes into contact with the convex tapered surface 52b from the outside in the radial direction. In the present embodiment, the centrifugal force receiving portion 36 also functions as a pressed surface that receives a pressing force from the adjusting portion 50 toward the tip end side in the axial direction.

[Explanation of tool body 3]
Parts other than the above of the tool body 2 will be described.
As shown in FIGS. 2 and 3, the support portion 24 is arranged on the rear end side in the axial direction of the adjusting portion 50 to support the adjusting portion 50. A plurality of support portions 24 are arranged on the outer peripheral surface of the tool body 2 at intervals in the circumferential direction. The number of support portions 24 is the same as the number of adjustment portions 50, and in the example of the present embodiment, 10 or more support portions 24 (for example, 20) are provided on the outer periphery of the tool body 2. The support portion 24 is arranged at the rear end portion of the outer peripheral surface of the peripheral wall of the outer main body portion 21.

The support portion 24 has a rib shape extending in the axial direction. The support portion 24 projects outward in the radial direction on the outer peripheral surface of the tool body 2. The support portion 24 projects outward in the radial direction from the portion 2a of the outer peripheral surface of the tool body 2 that is adjacent to the support portion 24 in the circumferential direction (the portion facing the circumferential direction) 2a. The portion 2a may be rephrased as a portion 2a between the support portions 24 adjacent to each other in the circumferential direction on the outer peripheral surface of the tool body 2.
The support portion 24 projects outward in the radial direction from a portion (recessed portion 25) adjacent to the tip end side of the support portion 24 on the outer peripheral surface of the tool body 2.

The support portion 24 has a screw hole 24a extending in the axial direction. The screw hole 24a penetrates the support portion 24 in the axial direction and opens to the front end surface and the rear end surface of the support portion 24. A female screw portion is provided on the inner peripheral surface of the screw hole 24a. The first screw shaft 53 is screwed into the screw hole 24a.
When viewed from the axial direction, the support portion 24, the adjusting portion 50, the insert mounting seat 4, and the cutting edge portion 30 are arranged so as to overlap each other.

The radial position of the portion 2b between the adjusting portions 50 adjacent to each other in the circumferential direction on the outer peripheral surface of the tool body 2 is inside the radial position of the adjusting portion 50. In other words, the adjusting portion 50 is arranged so as to project radially outward from the portion 2b between the adjusting portions 50 adjacent to each other in the circumferential direction on the outer peripheral surface of the tool body 2. In the example of the present embodiment, the radial position of the portion 2b between the adjusting portions 50 adjacent to each other in the circumferential direction on the outer peripheral surface of the tool body 2 is from the radial position of the center line C of the adjusting portion 50. Is also inside in the radial direction. The portion 2b may be rephrased as a portion (a portion facing the circumferential direction) 2b adjacent to the adjusting portion 50 in the circumferential direction on the outer peripheral surface of the tool body 2.

Although not particularly shown, in a cross-sectional view perpendicular to the central axis O, the portion 2b has an arc shape centered on the central axis O. In the axial region (range) where the portion 2b is arranged on the outer peripheral surface of the tool body 2, the radial position of the portion 2b is larger than the radial position of the portion other than the portion 2b. It is outside the direction. That is, in the axial region where the portion 2b is arranged, the portion 2b forms the outermost diameter portion of the outer peripheral surface of the tool body 2. Therefore, when the tool body 2 (outer body portion 21) is manufactured, the portion 2b can be formed by turning.

In the example of the present embodiment, the radial position of the portion 2b between the adjusting portions 50 adjacent to each other in the circumferential direction on the outer peripheral surface of the tool body 2 is the support adjacent to each other in the circumferential direction on the outer peripheral surface of the tool body 2. It is radially outside the position of the portion 2a between the portions 24 in the radial direction.
Further, of the outer peripheral surface of the tool body 2, the portion adjacent to the tip end side of the portion 2b projects radially outward from the portion 2b.

As shown in FIG. 2, the recessed portion 25 is arranged at a position overlapping the adjusting portion 50 on the outer peripheral surface of the tool main body 2 (outer main body portion 21) when viewed from the radial direction, and is recessed inward in the radial direction. The number of the recessed portions 25 is the same as the number of the adjusting portions 50, and in the example of the present embodiment, 10 or more recessed portions 25 (for example, 20) are provided on the outer periphery of the tool body 2.

In the example of this embodiment, the recess 25 has a rectangular hole shape. The recess 25 extends in the axial direction. The recessed portion 25 is arranged adjacent to the portion 2b between the adjusting portions 50 adjacent to each other in the circumferential direction on the outer peripheral surface of the tool body 2 in the circumferential direction. The recess 25 is arranged between the portions 2b adjacent to each other in the circumferential direction on the outer peripheral surface of the tool body 2. The recessed portion 25 is arranged radially inside the portion 2b. In other words, the radial position of the portion 2b is radially outside the radial position of the recess 25.

As shown in FIG. 3, a part of the adjusting portion 50 is arranged in the recessed portion 25. In the illustrated example, a part of the operation part 55 (diameter inner end) and a part of the nut member 52 (diameter inner end) of the adjustment part 50 are located in the recess 25. do. When viewed from the axial direction, a part of the operation portion 55 (inner end in the radial direction), a part of the nut member 52 (inner end in the radial direction), and the recess 25 are arranged so as to overlap each other. ..

[Action and effect of this embodiment]
According to the cutting edge position adjusting mechanism 20 and the cutting edge exchangeable milling cutter 1 of the present embodiment described above, the centrifugal force receiving portion 36 of the cutting edge portion 30 can support the adjusting portion 50 inward in the radial direction. Is. Therefore, even if a large centrifugal force (force outward in the radial direction of the tool) acts on the adjusting portion 50 during cutting, the centrifugal force receiving portion 36 supports the adjusting portion 50 inward in the radial direction. Deformation of the adjusting unit 50 and the like are suppressed. As a result, the durability (rigidity) of the adjusting unit 50 is improved, and the upper limit (maximum rotation speed) of the tool rotation speed at the time of cutting can be increased. Since the maximum rotation speed is increased, the tool can be used more safely. In addition, the range of tool rotation speeds that can be used is expanded, and various machining conditions can be met.

Further, in the present embodiment, the center line C of the adjusting portion 50 extends along the axial direction, and the cutting edge portion 30 slides and moves along the axial direction with respect to the tool body 2.
In this case, when a centrifugal force acts on the adjusting portion 50 during cutting, the durability of the adjusting portion 50 is more likely to be affected. According to the present embodiment, even in the above configuration, deformation of the adjusting unit 50 and the like can be suppressed, and the maximum rotation speed of the tool can be increased.

Further, in the present embodiment, the centrifugal force receiving portion 36 is provided at the rear end portion of the cutting edge portion 30 and can support the tip portion of the adjusting portion 50 inward in the radial direction.
Therefore, the above-mentioned effects can be obtained without complicating the structure of the cutting edge portion 30.

Further, in the present embodiment, the centrifugal force receiving portion 36 comes into radial contact with the adjusting portion 50.
When the centrifugal force receiving portion 36 comes into contact with the adjusting portion 50, the centrifugal force receiving portion 36 is pressed against the adjusting portion 50 by receiving a pressing force toward the axial tip side of the adjusting portion 50, as in the example of the present embodiment. It can also be used as a surface. Therefore, it is easy to simplify the structure of the cutting edge portion 30.

Further, in the present embodiment, the centrifugal force receiving portion 36 can support the nut member 52 inward in the radial direction.
That is, when a centrifugal force acts on the nut member 52 during cutting, the centrifugal force receiving portion 36 supports the nut member 52 inward in the radial direction. As a result, the durability of the adjusting unit 50 is improved, and the maximum rotation speed during cutting can be increased.

Further, in the present embodiment, the adjusting portion 50 has a plurality of screwing structures. That is, the tool body 2 and the shaft member 51 are screwed together, and the shaft member 51 and the nut member 52 are screwed together. Therefore, unlike the present embodiment, the adjustment having a single screwing structure (only the screwing structure of the shaft member 51 and the nut member 52), for example, when the shaft member 51 is fixed to the tool body 2. In this embodiment, the rigidity of the adjusting portion 50 tends to be lower than that of the portion. However, according to the present embodiment, the rigidity of the adjusting portion 50 is stably ensured by the centrifugal force receiving portion 36. Therefore, the adjusting portion 50 facilitates the axial position adjusting work of the cutting edge portion 30 and enables fine adjustment, while ensuring the durability of the adjusting portion 50.

Further, in the present embodiment, the centrifugal force receiving portion 36 is an inclined surface arranged on the rear end surface 30a of the cutting edge portion 30, and comes into contact with the convex tapered surface 52b of the tip surface of the nut member 52.
Therefore, the above-mentioned effects can be obtained while the centrifugal force receiving portion 36 has a simple structure.

Further, in the present embodiment, the specific gravity of the inner main body portion 22 of the tool main body 2 is smaller than the specific gravity of the outer main body portion 21.
Therefore, of the tool body 2, the outer main body 21 that requires high rigidity is made of, for example, steel, which makes it easy to secure rigidity, and the inner main body 22 is made of lightweight, for example, aluminum. The total weight of 2 can be reduced. That is, for example, unlike the case of the present embodiment, the weight of the tool can be reduced according to the present embodiment as compared with the case where the entire tool body is made of steel. That is, the weight of the tool can be reduced while ensuring the rigidity of the tool. Since the tool can be made lighter, it is easier to increase the maximum rotation speed of the tool.

Further, in the present embodiment, since the space portion 23 is provided between the outer main body portion 21 and the inner main body portion 22, the tool main body 2 can be lightened to reduce the weight, and the tool can be made lighter.
In this embodiment, a part of the space portion 23 (second space portion 23b) is used as the flow path portion of the coolant hole 3. Therefore, the coolant can be temporarily stored in a part of the space portion 23, the amount of the coolant ejected to the cutting edge portion 30 can be stabilized, and the coolant between the plurality of coolant holes 3 (second coolant holes 3b) can be stored. It is possible to easily equalize the ejection balance.

Further, since the radial position of the portion 2b between the adjusting portions 50 adjacent to each other in the circumferential direction on the outer peripheral surface of the tool body 2 is radially inside the radial position of the adjusting portion 50, the tool is used. Extra meat, that is, metal parts that are not necessary for ensuring tool rigidity can be reduced from the outer peripheral surface of the main body 2, and the tool can be made lighter.

Further, in the present embodiment, the support portion 24 projects outward in the radial direction from the portion 2a of the outer peripheral surface of the tool body 2 adjacent to the support portion 24 in the circumferential direction. That is, the radial position of the portion 2a is arranged radially inside the radial position of the support portion 24. As a result, excess meat in the vicinity of the support portion 24 on the outer peripheral surface of the tool body 2 can be reduced, and the weight of the tool can be further reduced.

Further, in the present embodiment, the cutting edge portion 30 is detachably attached to the outer peripheral portion (insert mounting seat 4) at the tip of the tool body 2.
That is, the cutting edge portion 30 is a removable cutting insert or cutting tip. Therefore, when the cutting edge portion 30 reaches the end of the tool life, the machining accuracy can be maintained satisfactorily by replacing the cutting edge portion 30 with another new cutting edge portion 30. Further, a plurality of types of cutting edge portions 30 having various cutting edge 7s can be prepared and selectively used according to the type of the work material, the processing form, and the like.

[Other configurations included in the present invention]
The present invention is not limited to the above-described embodiment, and the configuration can be changed without departing from the spirit of the present invention, for example, as described below.

7 and 8 show a first modification of the cutting edge position adjusting mechanism 20 described in the above-described embodiment.
In this first modification, the cutting edge portion 30 has a contact portion 39. The contact portion 39 is located radially inside the centrifugal force receiving portion 36 on the rear end surface 30a of the cutting edge portion 30. The contact portion 39 is an inclined surface extending outward in the radial direction according to the tip side, and comes into contact with the convex tapered surface 52b.

According to the first modification, the contact portion 39 functions as a part of the pressed surface that receives the pressing force from the adjusting portion 50 toward the tip end side in the axial direction. As a result, the pressing force from the adjusting portion 50 can be received in a wide range (multiple locations) of the rear end surface 30a of the cutting edge portion 30. Therefore, the pressing balance from the nut member 52 to the cutting edge portion 30 is stable.

9 to 11 show a second modification of the cutting edge position adjusting mechanism 20 described in the above-described embodiment.
In this second modification, the rear end surface 30a of the cutting edge portion 30 has a planar shape extending in a direction perpendicular to the center line C. The centrifugal force receiving portion 41 is a vertical wall surface that is arranged at the rear end portion of the cutting edge portion 30 and faces inward in the radial direction. The centrifugal force receiving portion 41 is arranged at the radial outer end portion of the rear end portion of the cutting edge portion 30. The centrifugal force receiving portion 41 has a planar shape extending in a direction perpendicular to the radial direction of the tool. The centrifugal force receiving portion 41 extends from the rear end surface 30a toward the rear end side.

The nut member 52 has a pillar portion 56 extending in the axial direction at the tip end portion of the nut member 52. In the illustrated example, the pillar portion 56 is columnar. Not limited to this, the pillar portion 56 may be a polygonal pillar or the like. The pillar portion 56 has a tip pressing surface 56a and a peripheral wall surface 56b.

The tip pressing surface 56a has a planar shape extending in a direction perpendicular to the center line C. The tip pressing surface 56a has a circular ring surface shape. The tip pressing surface 56a comes into contact with the rear end surface 30a of the cutting edge portion 30. The tip pressing surface 56a comes into contact with the rear end surface 30a from the rear end side. The tip pressing surface 56a presses the rear end surface 30a toward the tip side.

The peripheral wall surface 56b faces the centrifugal force receiving portion 41 from the inside in the radial direction. In the illustrated example, the centrifugal force receiving portion 41 faces the peripheral wall surface 56b with a radial gap. That is, the centrifugal force receiving portion 41 faces the adjusting portion 50 with a radial gap. When the centrifugal force acts on the adjusting portion 50, the centrifugal force receiving portion 41 comes into contact with the adjusting portion 50 and can support the adjusting portion 50 inward in the radial direction.

In the second modification, when a centrifugal force of a predetermined value or more acts on the adjusting portion 50 during cutting, the centrifugal force receiving portion 41 comes into contact with the adjusting portion 50. In this case, the cutting edge portion 30 can be separately provided with a pressed surface that receives a pressing force from the adjusting portion 50 toward the tip end side in the axial direction and a centrifugal force receiving portion 41, and each function can be further enhanced. Can be stabilized.

Specifically, the cutting edge portion 30 receives a pressing force from the adjusting portion 50 toward the tip end side in the axial direction on the rear end surface 30a. Further, when a centrifugal force directed outward in the radial direction acts on the adjusting portion 50, the cutting edge portion 30 receives this centrifugal force at the centrifugal force receiving portion 41. That is, since the portion of the cutting edge portion 30 that receives the pressing force and the portion that receives the centrifugal force are separately provided, the cutting edge portion 30 can stably receive the pressing force and the centrifugal force, respectively.

12 and 13 show a third modification of the cutting edge position adjusting mechanism 20 described in the above-described embodiment.
In this third modification, the cutting edge portion 30 of the second modification has a protrusion 42. The protrusion 42 is located radially inside the centrifugal force receiving portion 41 at the rear end portion of the cutting edge portion 30. The protrusion 42 is arranged at the radial inner end of the rear end of the cutting edge 30. The protrusion 42 faces the peripheral wall surface 56b from the inside in the radial direction.

According to the third modification, the pillar portion 56 of the nut member 52 is arranged so as to be sandwiched between the centrifugal force receiving portion 41 and the protrusion portion 42 of the cutting edge portion 30 from both sides in the radial direction. Therefore, the assembling posture of the nut member 52 and the cutting edge portion 30 is stable.

14 and 15 show a fourth modification of the cutting edge position adjusting mechanism 20 described in the above-described embodiment.
In this fourth modification, the cutting edge portion 30 has a recess 43 recessed from the rear end surface 30a of the cutting edge portion 30 toward the tip end side. The rear end surface 30a has a planar shape extending in a direction perpendicular to the center line C. The recess 43 is located between both ends in the radial direction on the rear end surface 30a. The centrifugal force receiving portion 44 is a vertical wall surface of the inner surface of the recess 43 facing inward in the radial direction. The centrifugal force receiving portion 44 has a planar shape extending in a direction perpendicular to the radial direction of the tool. The centrifugal force receiving portion 44 extends from the rear end surface 30a toward the tip end side.

The nut member 52 has a pressing surface 57 and a convex portion 58 at the tip end portion of the nut member 52. The pressing surface 57 has a planar shape extending in a direction perpendicular to the center line C. The pressing surface 57 has a circular ring surface shape. The pressing surface 57 faces the tip end side and comes into contact with the rear end surface 30a of the cutting edge portion 30. The pressing surface 57 comes into contact with the rear end surface 30a from the rear end side. The pressing surface 57 presses the rear end surface 30a toward the tip end side.

The convex portion 58 projects toward the tip end side of the pressing surface 57. The convex portion 58 is a columnar shape extending in the axial direction. In the illustrated example, the convex portion 58 is cylindrical. Not limited to this, the convex portion 58 may be a polygonal columnar shape or the like. The convex portion 58 is located in the concave portion 43. The convex portion 58 faces the centrifugal force receiving portion 44 from the inside in the radial direction. In the illustrated example, the centrifugal force receiving portion 44 faces the outer peripheral surface of the convex portion 58 with a radial gap. That is, the centrifugal force receiving portion 44 faces the adjusting portion 50 with a radial gap. When the centrifugal force acts on the adjusting portion 50, the centrifugal force receiving portion 44 comes into contact with the adjusting portion 50 and can support the adjusting portion 50 inward in the radial direction. Further, a gap is provided between the front end surface of the convex portion 58 and the bottom surface facing the rear end side of the concave portion 43.

According to the fourth modification, the cutting edge portion 30 receives a pressing force from the adjusting portion 50 toward the tip end side in the axial direction on the rear end surface 30a. Further, when a centrifugal force directed outward in the radial direction acts on the adjusting portion 50, the cutting edge portion 30 receives this centrifugal force at the centrifugal force receiving portion 44. That is, the centrifugal force receiving portion 44 of the concave portion 43 can support the convex portion 58 inward in the radial direction. Since the portion of the cutting edge portion 30 that receives the pressing force and the portion that receives the centrifugal force are separately provided, the cutting edge portion 30 can stably receive the pressing force and the centrifugal force, respectively.

16 to 18 show a fifth modification of the cutting edge position adjusting mechanism 20 described in the above-described embodiment.
In this fifth modification, the nut member 52 has a concave tapered surface 53c on the front end surface of the nut member 52 whose diameter is reduced toward the rear end side. The concave tapered surface 53c has a conical surface shape. The concave tapered surface 53c is a circular ring extending over the entire circumference around the center line C on the tip surface of the nut member 52.

The centrifugal force receiving portion 45 is arranged on the rear end surface 30a of the cutting edge portion 30, has a tapered shape whose diameter decreases toward the rear end side, and comes into contact with the concave tapered surface 53c. The centrifugal force receiving portion 45 has a conical surface shape. The centrifugal force receiving portion 45 is a circular ring extending over the entire circumference around the center line C on the rear end surface 30a. The centrifugal force receiving portion 45 comes into contact with the concave tapered surface 53c and supports the adjusting portion 50 inward in the radial direction. The centrifugal force receiving portion 45 supports the concave tapered surface 53c in the radial direction at a portion located radially inward from the center line C.

According to the fifth modification, since the convex tapered centrifugal force receiving portion 45 comes into contact with the concave tapered surface 53c of the nut member 52, the nut member 52 can obtain the above-mentioned action and effect by the centrifugal force receiving portion 45. And the assembling posture of the cutting edge portion 30 are stable. Further, the pressing force from the adjusting portion 50 can be received in a wide range of the rear end surface 30a of the cutting edge portion 30. Therefore, the pressing balance from the nut member 52 to the cutting edge portion 30 is stable.

Further, in the above-described embodiment, an example is described in which the shaft operation hole 55a is opened on the outer peripheral surface of the operation portion 55 of the shaft member 51, and the nut operation hole 52a is opened on the outer peripheral surface of the nut member 52. Then, a work tool such as a wrench is inserted into the shaft operation hole 55a and the nut operation hole 52a, and the shaft member 51 and the nut member 52 are rotated around the center line C. Not limited to this, for example, the outer peripheral surface of the operation unit 55 and the outer peripheral surface of the nut member 52 may have a polygonal shape such as a hexagon in a cross-sectional view perpendicular to the center line C. Then, the shaft member 51 and the nut member 52 may be rotated around the center line C by a work tool such as a spanner.
Further, the adjusting portion 50 may press the cutting edge portion 30 toward the tip end side in the axial direction so that the axial position of the cutting edge portion 30 can be adjusted. For example, the shaft member 51 may be fixed to the tool body 2 without being screwed. Further, the adjusting portion 50 is not limited to the configuration having the shaft member 51 and the nut member 52.

In the above-described embodiment, the cutting edge portion 30 is detachably attached to the outer peripheral portion of the tip of the tool body 2, but the present invention is not limited to this. The cutting edge portion 30 may be attached to the tool body 2 so that its position can be adjusted in the axial direction, and may be attached to the outer peripheral portion of the tip of the tool body 2 in a non-removable manner. That is, the milling tool is not limited to the milling cutter 1 having a replaceable cutting edge.

In addition, as long as it does not deviate from the gist of the present invention, each configuration (component) described in the above-described embodiments, modifications, and notes may be combined, and additions, omissions, substitutions, and the like of the configurations may be combined. It can be changed. Further, the present invention is not limited to the above-described embodiments, but is limited only to the scope of claims.

1 ... Milling cutter with replaceable cutting edge (rolling tool)
2 ... Tool body 20 ... Cutting edge position adjustment mechanism 30 ... Cutting edge 30a ... Rear end surface 36, 41, 44, 45 ... Centrifugal force receiving part 39 ... Contact part 42 ... Protruding part 43 ... Recessed part 50 ... Adjusting part 51 ... Shaft member 52 ... Nut member 52b ... Convex tapered surface 53c ... Concave tapered surface 56 ... Pillar part 56a ... Tip pressing surface 56b ... Circumferential wall surface 57 ... Pressing surface 58 ... Convex part C ... Center line O ... Central axis

Claims (10)

A cutting edge located on the outer periphery of the tip of the tool body that is rotated around the central axis,
An adjusting portion arranged on the outer periphery of the tool body and pressing the cutting edge portion toward the tip end side in the axial direction in which the central axis extends to adjust the axial position of the cutting edge portion. Prepare,
The cutting edge portion has a centrifugal force receiving portion capable of supporting the adjusting portion inward in the radial direction .
The center line of the adjusting portion extends along the axial direction and extends.
The cutting edge portion is a position adjusting mechanism for the cutting edge portion that slides and moves along the axial direction with respect to the tool body . The position adjusting mechanism for the cutting edge portion according to claim 1 .
The centrifugal force receiving portion is a position adjusting mechanism for a cutting edge portion that is in contact with the adjusting portion in the radial direction or faces the adjusting portion with a gap in the radial direction . The position adjusting mechanism for the cutting edge according to claim 1 or 2 .
The adjustment unit
The shaft member supported by the tool body and
It has a nut member that is screwed to the shaft member and comes into contact with the cutting edge portion.
By adjusting the screwing amount of the nut member with respect to the shaft member, the position of the cutting edge portion in the axial direction is adjusted.
The centrifugal force receiving portion is a position adjusting mechanism for a cutting edge portion capable of supporting the nut member inward in the radial direction. The position adjusting mechanism for the cutting edge according to claim 3 .
The nut member has a convex tapered surface whose diameter is reduced toward the tip side on the tip surface of the nut member.
The centrifugal force receiving portion is arranged on the rear end surface of the cutting edge portion, is an inclined surface extending inward in the radial direction toward the tip side, and is a position of the cutting edge portion that comes into contact with the convex tapered surface. Adjustment mechanism. The position adjusting mechanism for the cutting edge according to claim 4 .
The cutting edge portion has a contact portion located radially inside the centrifugal force receiving portion on the rear end surface of the cutting edge portion.
The contact portion is an inclined surface extending outward in the radial direction according to the tip side, and is a position adjusting mechanism for the cutting edge portion that comes into contact with the convex tapered surface. The position adjusting mechanism for the cutting edge according to claim 3 .
The centrifugal force receiving portion is a vertical wall surface arranged at the rear end portion of the cutting edge portion and facing inward in the radial direction.
The nut member has a pillar portion extending in the axial direction at the tip end portion of the nut member.
The pillar is
The tip pressing surface that comes into contact with the rear end surface of the cutting edge portion,
A position adjusting mechanism for a cutting edge portion having a peripheral wall surface facing the centrifugal force receiving portion from the inside in the radial direction. The position adjusting mechanism for the cutting edge portion according to claim 6 .
The cutting edge portion has a protrusion located at the rear end portion of the cutting edge portion radially inward with respect to the centrifugal force receiving portion.
The protrusion is a mechanism for adjusting the position of the cutting edge so as to face the peripheral wall surface from the inside in the radial direction. The position adjusting mechanism for the cutting edge according to claim 3 .
The cutting edge portion has a recess recessed from the rear end surface of the cutting edge portion toward the tip end side.
The centrifugal force receiving portion is a vertical wall surface of the inner surface of the concave portion facing inward in the radial direction.
The nut member is attached to the tip of the nut member.
A pressing surface that faces the tip side and comes into contact with the rear end surface of the cutting edge portion,
It has a convex portion protruding toward the tip side from the pressing surface, and has.
The convex portion is a position adjusting mechanism for a cutting edge portion located in the concave portion and facing the centrifugal force receiving portion from the inside in the radial direction. The position adjusting mechanism for the cutting edge according to claim 3 .
The nut member has a concave tapered surface whose diameter is reduced toward the rear end side on the front end surface of the nut member.
The centrifugal force receiving portion is arranged on the rear end surface of the cutting edge portion, has a tapered shape whose diameter is reduced toward the rear end side, and is in contact with the concave tapered surface, and is a position adjusting mechanism of the cutting edge portion. The tool body that can be rotated around the central axis and
A plurality of cutting edge portions arranged at intervals in the circumferential direction on the outer peripheral portion of the tip of the tool body, and
The cutting edge portions are arranged on the outer periphery of the tool body at intervals in the circumferential direction, and the cutting edge portion is pressed toward the tip end side in the axial direction in which the central axis extends, and the axial position of the cutting edge portion. With multiple adjustment parts to adjust,
The cutting edge portion has a centrifugal force receiving portion capable of supporting the adjusting portion inward in the radial direction .
The center line of the adjusting portion extends along the axial direction and extends.
The cutting edge portion is a rolling tool that slides and moves along the axial direction with respect to the tool body .

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