JP7167468B2 - milling tool - Google Patents

Description

The present invention relates to a milling tool such as an indexable milling cutter.

Conventionally, a cutting edge position adjusting mechanism disclosed in Patent Document 1 is known. The cutting edge position adjusting mechanism includes a shaft member that is screwed to the tool body, and a nut member that is screwed to the shaft member and comes into contact with the cutting edge member. When adjusting the position of the cutting edge, a working tool such as a wrench is used to adjust the screwing amount of the shaft member into the tool body or the screwing amount of the nut member into the shaft member.

JP 2014-213404 A

This type of milling tool has room for improvement in terms of enhancing workability in adjusting the position of the cutting edge. In addition, there is a demand for tools that can be used regardless of the type of machining center (machine tool), etc., and a reduction in the weight of the tools has been desired.

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to provide a milling tool capable of improving the workability of adjusting the position of the cutting edge and reducing the weight of the milling tool.

One aspect of the milling tool of the present invention comprises a tool body that is rotated around a central axis, a plurality of cutting edge portions that are circumferentially spaced apart from each other on the tip outer peripheral portion of the tool body, and a plurality of adjustment units arranged on the outer circumference of the tool body at intervals in the circumferential direction, and for adjusting the axial position of the cutting edge by pressing the cutting edge toward the distal end side in the axial direction; the radial position of a portion of the outer peripheral surface of the tool body between the adjusting portions adjacent in the circumferential direction is radially inside the radial position of the adjusting portion ; The tool body has a support portion that is arranged on the rear end side of the adjustment portion in the axial direction and supports the adjustment portion, and the support portion is arranged on the outer peripheral surface of the tool body with respect to the support portion. It protrudes radially outward from the circumferentially adjacent portion.
Further, one aspect of the milling tool of the present invention comprises a tool body that is rotated around a central axis, and a plurality of cutting edge portions that are circumferentially spaced apart from each other on the tip outer peripheral portion of the tool body. and a plurality of adjustment units arranged circumferentially spaced apart from each other on the outer periphery of the tool body, for adjusting the axial position of the cutting edge by pressing the cutting edge toward the distal end side in the axial direction. wherein a radial position of a portion of the outer peripheral surface of the tool body between the adjusting portions adjacent in the circumferential direction is radially inside the radial position of the adjusting portion. The adjusting portion has a shaft member screwed onto the tool body and a nut member screwed onto the shaft member and in contact with the cutting edge portion, and the amount of screwing of the shaft member into the tool body is adjusted. , or 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 center line of the shaft member is aligned in the axial direction of the tool body. The radial position of a portion of the outer peripheral surface of the tool body between the adjusting portions adjacent in the circumferential direction is radially inside the radial position of the center line. .
Further, one aspect of the milling tool of the present invention comprises a tool body that is rotated around a central axis, and a plurality of cutting edge portions that are circumferentially spaced apart from each other on the tip outer peripheral portion of the tool body. and a plurality of adjustment units arranged circumferentially spaced apart from each other on the outer periphery of the tool body, for adjusting the axial position of the cutting edge by pressing the cutting edge toward the distal end side in the axial direction. wherein a radial position of a portion of the outer peripheral surface of the tool body between the adjusting portions adjacent in the circumferential direction is radially inside the radial position of the adjusting portion. , the tool body has a cylindrical outer body portion with a bottom and an inner body portion disposed inside the outer body portion, the specific gravity of the inner body portion being higher than the specific gravity of the outer body portion The tool body has a space located between the outer body portion and the inner body portion.

According to one aspect of the milling tool of the present invention, of the outer peripheral surface of the tool body, the radial position of the portion between the adjusting portions adjacent in the circumferential direction is radially higher than the radial position of the adjusting portion. placed inside the Therefore, when adjusting the position of the cutting edge in the axial direction by operating the adjusting portion, the portion between the adjusting portions on the outer peripheral surface of the tool body is less likely to interfere with the adjustment work. That is, it is possible to prevent a working tool such as a wrench used when operating the adjusting portion from coming into contact with the outer peripheral surface of the tool body. Therefore, workability in adjusting the position of the cutting edge is improved.

In addition, since the radial position of the portion between the adjusting portions adjacent in the circumferential direction on the outer peripheral surface of the tool body is radially inner than the radial position of the adjusting portion, the outer peripheral surface of the tool body Therefore, the excess meat, that is, the metal parts that are not necessary to secure the tool rigidity can be reduced, and the tool weight can be reduced.

In the above-described milling tool, the tool body has a support portion arranged on the rear end side of the adjustment portion in the axial direction to support the adjustment portion, and the support portion is located on the outer peripheral surface of the tool body. It protrudes radially outward from the portion adjacent to the support portion in the circumferential direction .

In this case, the radial position of the portion of the outer peripheral surface of the tool body that is adjacent to the support portion in the circumferential direction is arranged radially inside the radial position of the support portion. As a result, excess thickness in the vicinity of the support portion can be reduced on the outer peripheral surface of the tool body, and the weight of the tool can be further reduced.

In the above-described milling tool, the adjusting portion has a shaft member screwed onto the tool body, and a nut member screwed onto the shaft member and in contact with the cutting edge portion. The axial position of the cutting edge portion is adjusted by adjusting either the screwing amount of the shaft member or the screwing amount of the nut member with respect to the shaft member .

In this case, when adjusting either the amount of screwing of the shaft member or the amount of screwing of the nut member, on the outer peripheral surface of the tool body, the portion between the adjusting portions adjacent in the circumferential direction is less likely to interfere. That is, as described above, since the portion between the adjusting portions is arranged radially inward of the adjusting portion, the work of screwing the shaft member and the nut member becomes easier, and the workability of adjusting the position of the cutting edge portion becomes easier. is enhanced.

In the above-described milling tool, the center line of the shaft member extends along the axial direction of the tool body, and the center line of the shaft member extends in the radial direction of the portion between the adjustment portions adjacent in the circumferential direction on the outer peripheral surface of the tool body. is radially inside the radial position of the center line .

In this case, a working tool such as a wrench for operating the adjustment portion can be prevented from coming into contact with the outer peripheral surface of the tool body, thereby improving the workability of adjusting the position of the cutting edge. In addition, excess thickness can be further reduced in the portion between the adjusting portions on the outer peripheral surface of the tool body, and the weight of the tool can be reduced.
In the above-described milling tool, the tool body has a bottomed tubular outer body portion and an inner body portion disposed inside the outer body portion, and the specific gravity of the inner body portion is Smaller than the specific gravity of the main body.
In this case, the outer body portion of the tool body, which requires high rigidity, is made of, for example, a steel material that easily secures rigidity, and the inner body portion is made of a lightweight material, such as aluminum, so that the total weight of the tool body is can be reduced. That is, compared with the case where the entire tool body is made of steel, for example, according to the above configuration, the weight of the tool can be reduced. Therefore, the weight of the tool can be reduced while ensuring the rigidity of the tool.
In the above-described milling tool, the tool body has a space portion located between the outer body portion and the inner body portion.
In this case, since a space is provided between the outer body portion and the inner body portion, the weight of the tool body can be reduced by hollowing out the body, and the weight of the tool can be further reduced.

In the above-described milling tool, the tool body has a recessed portion that is arranged at a position that overlaps with the adjusting portion on the outer peripheral surface of the tool body when viewed in the radial direction and that is recessed radially inward. A portion is preferably located within the recess.

In this case, since a portion of the adjusting portion is arranged in the recessed portion, for example, the outer diameter of the adjusting portion can be increased accordingly, which facilitates adjustment work (especially fine adjustment by rotating operation).

In the above-described milling tool, the radial position of the portion between the adjusting portions adjacent in the circumferential direction on the outer peripheral surface of the tool body is radially outside the radial position of the recessed portion. is preferably

In this case, it is possible to prevent the portion of the outer peripheral surface of the tool body between the adjusting portions adjacent in the circumferential direction from being excessively retracted inward in the radial direction, thereby making it easier to ensure the rigidity of the tool body at a predetermined level or higher. can.

In the above-described milling tool, it is preferable that the radial position of the radial outer end of the adjusting portion is radially inside the radial position of the radial outer end of the cutting edge portion.

In this case, since the adjustment portion is arranged radially inward of the cutting edge portion, it is possible to suppress an increase in the outer diameter of the tool due to the provision of the adjustment portion. In addition, since the adjustment portion is prevented from coming into contact with the work material during cutting, the degree of freedom in the machining mode (machining conditions) increases.

In the above-described milling tool, it is preferable that the cutting edge portion is detachably attached to the tip outer peripheral portion of the tool body.

In this case, the cutting edge portion is a removable cutting insert or cutting tip, and the milling tool is an indexable milling tool such as an indexable milling cutter. Therefore, when the cutting edge reaches the end of its tool life, it can be replaced with a new cutting edge to maintain good machining accuracy. In addition, it is possible to prepare and selectively use a plurality of types of cutting edge portions having various cutting edges according to the type of work material, processing mode, and the like.

According to the milling tool of one aspect of the present invention, it is possible to improve the workability of adjusting the position of the cutting edge and to reduce the weight.

1 is a perspective view of an indexable milling cutter (milling tool) according to one embodiment of the present invention; FIG. 1 is a perspective view of an indexable milling cutter according to an embodiment of the present invention; FIG. 1 is a bottom view (front view) of an indexable milling cutter according to an embodiment of the present invention; FIG. 1 is a side view of an indexable milling cutter according to an embodiment of the present invention; FIG. 1 is a longitudinal sectional view of an indexable milling cutter according to an embodiment of the present invention; FIG. FIG. 6 is a view showing a VI-VI section of FIG. 5; It is a perspective view which shows a tool main body. It is a perspective view which shows the outer main-body part of a tool main body. It is a top view which shows a cutting edge part.

Hereinafter, an indexable milling cutter 1, which is an example of a milling tool according to an embodiment of the present invention, will be described with reference to the drawings.

[Schematic configuration of indexable milling cutter]
The indexable milling cutter 1 of this embodiment is a milling tool (cutting tool) for milling a work material such as a metal material. The indexable milling cutter 1 mainly performs milling (cutting) such as face milling on a work material. Face cutting is milling that forms a machined surface perpendicular to the central axis O of the tool body 2 on the work material.

As shown in FIGS. 1 to 6, the indexable milling cutter 1 includes a tool body 2, a cutting edge portion 30, and an adjustment portion 50. As shown in FIGS.
The tool body 2 has a substantially cylindrical shape centered on the central axis O. As shown in FIG. The tool body 2 is mounted on a spindle of a machine tool (not shown) and rotated around the central axis O by the spindle.
A plurality of cutting edge portions 30 are arranged on the tip outer peripheral portion of the tool body 2 at intervals in the circumferential direction. The cutting edge portion 30 is called a cutting insert or cutting tip. The cutting edge portion 30 is detachably attached to the tip outer peripheral portion of the tool body 2 . A plurality of insert mounting seats 4 are provided on the outer periphery 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 so that the cutting edge 7 protrudes from the tool body 2 toward the tip side and radially outward.
In the indexable milling cutter 1 of the present embodiment, the insert mounting seats 4 are provided at 10 or more locations (for example, 20 locations) at intervals in the tool body 2 in the circumferential direction, and the cutting edge portion 30 is also provided at the insert mounting seats 4. 10 or more (for example, 20) are provided. This indexable milling cutter 1 is a so-called multi-blade milling cutter.

The indexable milling cutter 1 has the upper part of the tool body 2 attached to the spindle of the machine tool. The indexable milling cutter 1 is moved in a direction intersecting the central axis O (for example, a direction perpendicular to it) while the tool body 2 is rotated in the tool rotation direction T about the central axis O by the spindle. Then, the workpiece is milled by the cutting edges 7 of the plurality of cutting edge portions 30 attached to the tool body 2 .

[Definition of orientation (direction) used in this embodiment]
In this embodiment, the direction along the central axis O of the tool body 2 (the direction in which the central axis O extends) is called the axial direction. In the axial direction, the direction from the attachment portion 5 of the tool body 2 attached to the spindle of the machine tool toward the insert attachment seat 4 and the cutting edge portion 30 is called the tip side, and the direction from the insert attachment seat 4 and the cutting edge portion 30 The direction toward the mounting portion 5 is called the rear end side.
A direction orthogonal to the central axis O is called a radial direction. Among the radial directions, the direction approaching the central axis O is called the radial inner side, and the direction away from the central axis O is called the radial outer side.
The direction of rotation around the central axis O is called the circumferential direction. Among 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 opposite direction of rotation is called the opposite direction (or opposite direction) to the tool rotation direction T. tool rotation direction).

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

As shown in FIGS. 5 to 8, the outer body portion 21 has a cylindrical shape with a bottom. The outer body portion 21 has a peripheral wall and a bottom wall. The outer body portion 21 is made of steel, for example.
The inner body portion 22 has a substantially cylindrical shape. The inner body portion 22 is arranged inside the outer body portion 21 . That is, the inner body portion 22 has a portion located inside the outer body portion 21 . The inner body portion 22 is made of, for example, an aluminum material. The specific gravity of the inner body portion 22 is smaller than the specific gravity of the outer body portion 21 .

The inner 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 to the rear end surface of the cylindrical portion 22a and is recessed from the rear end surface to the front end side. A spindle of a 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 is in the shape of a circular ring plate. A distal end surface (lower surface) of the flange portion 22 b faces a rear end surface (upper surface) of the peripheral wall of the outer main body portion 21 .

As shown in FIG. 5 , of the outer peripheral surface of the cylindrical portion 22 a , the portion adjacent to the distal end side of the flange portion 22 b is fitted into the rear end opening of the peripheral wall of the outer body portion 21 .
Of the front end surface 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 cylindrical 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 positioned between the outer body portion 21 and the inner body portion 22 . The space 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 body portion 21 and the outer peripheral surface of the cylindrical portion 22a. The first space 23a is a cylindrical space centered on the central axis O. As shown in FIG.
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 23b is a circular ring-shaped space centered on the central axis O. As shown in FIG. The second space 23b is positioned between the outer peripheral end and the inner peripheral end of the front end surface of the cylindrical portion 22a. The second space 23b forms part of the flow path of the coolant hole 3. As shown in FIG.

The coolant hole 3 extends inside the tool body 2 . A coolant hole 3 passes through the tool body 2 . Coolant (cutting fluid) supplied through the spindle of the machine tool flows through the coolant hole 3 . The coolant hole 3 has a first coolant hole 3a, a second coolant hole 3b, and a second space 23b.

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

A plurality of chip pockets 6 are provided on the tip outer peripheral portion of the tool body 2 (outer body portion 21) at intervals in the circumferential direction. The chip pocket 6 is formed in a concave shape at the tip outer peripheral portion of the tool body 2 .
The insert mounting seat 4 is arranged adjacent to the tip pocket 6 in the direction opposite to the tool rotation direction T in the tip outer peripheral portion of the tool body 2 (outer body portion 21). In other words, the chip pocket 6 is arranged adjacent to the insert mounting seat 4 in the tool rotation direction T. As shown in FIG. 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 the parts of the tool body 2 other than those described above will be given separately later.

[Cutting edge]
As shown in FIG. 9, the cutting edge portion 30 is, for example, a face milling insert used for face milling (face milling). As the plurality of cutting edge portions 30 attached to 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. may
The cutting edge portion 30 extends along an insert body 31 attached to the insert mounting seat 4 of the tool body 2, and along the intersection ridgeline between the rake face 32 and the flank face of the insert body 31, and is arranged on the tip outer periphery of the insert body 31. and a cutting edge 7 to be formed.

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 attached to the insert mounting seat 4, the longitudinal direction of the rectangular surfaces (front and back surfaces) of the insert body 31 is arranged along the axial direction of the tool body 2 (see FIG. 4). The short side direction of the rectangular surface of the insert body 31 is arranged along the radial direction of the tool body 2 (see FIG. 3).

The insert 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 and having a cutting edge 7 formed thereon.
The base metal part 34 is made of cemented carbide, for example. 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, not limited to this, the entire insert body 31 including the base metal portion 34 and the blade portion 35 may be made of cemented carbide, for example, and may be integrally formed of a single member.

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

One polygonal surface of the base metal portion 34 is formed with a clamp concave portion 37 recessed from the polygonal surface in the thickness direction. In the example of this embodiment, the clamp concave portion 37 is D-shaped in a plan view of the cutting edge portion 30 in the thickness direction. However, the clamp recess 37 is not limited to a D shape in plan view. The depth of the clamp concave portion 37 increases from the end opposite to the blade portion 35 along the width direction of the insert body 31 toward the blade portion 35 . That is, the bottom surface of the clamp recess 37 is an inclined surface. When the cutting edge portion 30 is attached to the insert mounting seat 4, the bottom surface of the clamp recess portion 37 extends in the direction opposite to the tool rotation direction T as it extends radially outward.

A rib 38 is formed on one polygonal surface of the base metal portion 34 at a portion located between the clamp recess 37 and the blade portion 35 so as to protrude from the polygonal surface in the thickness direction. In a plan view of the cutting edge portion 30 shown in FIG. 9, the rib 38 extends linearly substantially parallel to the oblique side of the blade portion 35 forming a substantially right-angled triangular shape. The ribs 38 are arranged to face the blade portion 35 from the longitudinal direction and the lateral direction of the insert body 31 . Therefore, when the cutting edge portion 30 is attached to 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 inner side in the radial direction. . The ribs 38 are in contact with chips produced by cutting the workpiece with the cutting edge 7 .

As shown in FIG. 3 , the thickness of the cutting edge portion 30 increases along the transverse direction of the insert body 31 from the edge portion 35 toward the end opposite to the edge portion 35 . That is, when the cutting edge portion 30 is attached to the insert mounting seat 4, the thickness of the cutting edge portion 30 increases toward the inside in the radial direction.

As shown in FIG. 4, when the cutting edge portion 30 is attached to the insert mounting seat 4, the axial rake (axial rake angle) of the cutting edge 7 is a positive angle.
In FIG. 9, the portion of the cutting edge 7 extending in the transverse direction of the insert body 31 is a front cutting edge 7a. The front cutting edge 7a is linear. Note that the front cutting edge 7a is not limited to a linear shape, and may be, for example, a convex curved shape having a large radius of curvature. The front cutting edge 7a protrudes from the insert mounting seat 4 toward the distal end side of the tool body 2 when the cutting edge portion 30 is attached to the insert mounting seat 4. As shown in FIG.
A portion of the cutting edge 7 extending in the longitudinal direction of the insert body 31 is a peripheral cutting edge 7b. The peripheral cutting edge 7b is linear. The peripheral cutting edge 7b protrudes radially outward of the tool body 2 from the insert mounting seat 4 when the cutting edge portion 30 is attached to the insert mounting seat 4 .
A portion of the cutting edge 7 positioned between the front cutting edge 7a and the peripheral cutting edge 7b is a corner cutting edge 7c. The corner edge 7c is convexly curved or linear. The corner cutting edge 7c protrudes from the insert mounting seat 4 toward the outer periphery of the tip of the tool body 2 when the cutting edge portion 30 is attached to the insert mounting seat 4. As shown in FIG.

[Explanation of tool body 2]
The insert mounting seat 4 of the tool body 2 will be described in detail.
As shown in FIGS. 3 to 5, 7 and 8, the insert mounting seat 4 extends axially with openings on the tip end surface and the outer peripheral surface of the tool body 2. As shown in FIGS. The insert mounting seat 4 has a first wall surface 8 facing in the opposite direction to the tool rotation direction T, a second wall surface 9 facing in the tool rotating direction T, and a radially inner end portion of the insert mounting seat 4. It has a third wall surface 10 facing radially outward and a clamp screw hole 11 .

As shown in FIG. 3, in the example of the present embodiment, the first wall surface 8 is planar extending along a virtual plane (not shown) including the central axis O of the tool body 2, and the third wall surface 10 is a 1 wall surface 8 and the planar shape which is substantially orthogonal. The second wall surface 9 extends in the tool rotation direction T as it extends radially outward. Therefore, the distance between the second wall surface 9 and the first wall surface 8 (the width of the insert mounting seat 4 in the circumferential direction) decreases radially outward.

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) facing the thickness direction of the cutting edge portion 30 contacts 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 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 contacts the second wall surface 9 . A lateral side of the cutting edge 30 contacts the third wall surface 10 . The cutting edge portion 30 is circumferentially sandwiched between the first wall surface 8 and the second wall surface 9 .
In the example of the present embodiment, as described above, the circumferential width of the insert mounting seat 4 becomes smaller as it goes radially outward, so that the cutting edge portion 30 inserted into the insert mounting seat 4 is aligned with the insert mounting seat. 4 is restrained from moving radially outward. That is, the cutting edge portion 30 is prevented from slipping out of the insert mounting seat 4 to the outside in the radial direction.

As shown in FIGS. 7 and 8 , the clamp screw hole 11 opens to the outer peripheral surface (chip 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 radially inward in a direction opposite to the tool rotation direction T. As shown in FIG. A clamp screw 19 is screwed into the clamp screw hole 11 (see FIG. 4). The tip of the clamp screw 19 contacts the bottom surface of the clamp recess 37 of the cutting edge 30 . The cutting edge portion 30 is fixed to the insert mounting seat 4 by screwing the clamp screw 19 into the clamp screw hole 11 .

[Adjustment part]
As shown in FIGS. 4 to 6, a plurality of adjustment portions 50 are arranged on the outer periphery of the tool body 2 (outer body portion 21) at intervals in the circumferential direction. The adjusting portion 50 presses the cutting edge portion 30 toward the distal end side in the axial direction to adjust the axial position of the cutting edge portion 30 . The adjustment unit 50 adjusts the axial position of the cutting edge 7 by adjusting the axial position of the cutting edge 30 with respect to the tool body 2 . The number of adjustment portions 50 is the same as the number of cutting edge portions 30 , and in the example of the present embodiment, ten or more (for example, twenty) adjustment portions 50 are provided on the outer periphery of the tool body 2 .

The adjusting section 50 has a shaft member 51 and a nut member 52 .
The shaft member 51 is screwed onto the tool body 2 . The nut member 52 is screwed onto the shaft member 51 and comes into contact with the cutting edge portion 30 .
As shown in FIG. 5 , the centerline C of the shaft member 51 extends along the axial direction of the tool body 2 . Therefore, 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 about the center line C with respect to the tool body 2 (supporting portion 24), and is axially moved with respect to the tool body 2 by the action of the screw. The nut member 52 is rotated about the center line C with respect to the shaft member 51 and the tool body 2 and axially moves with respect to the shaft member 51 and the tool body 2 by the action of the screw.

The shaft member 51 has a first screw shaft 53 positioned at the rear end of the shaft member 51, a second screw shaft 54 positioned at the front end, and a first screw shaft 53 and a second screw shaft 54 along the axial direction. and an operation unit 55 positioned between.
The outer diameter of the first screw shaft 53 is larger than the outer diameter of the second screw shaft 54 . A male screw portion is 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 threaded portion of the first screw shaft 53 and the male threaded portion of the second screw shaft 54 have different thread pitches. Specifically, the pitch of the male threaded portion of the first screw shaft 53 is greater than the pitch of the male threaded portion of the second screw shaft 54 .

The operation portion 55 is cylindrical or disk-shaped. The outer diameter of the operating portion 55 is larger than the outer diameters of the first screw shaft 53 and the second screw shaft 54 . A shaft operation hole 55 a is opened in the outer peripheral surface of the operation portion 55 . A plurality of shaft operation holes 55a (for example, four at equal intervals) are provided around the center line C on the outer peripheral surface of the operation portion 55 at intervals. As shown in FIG. 6, the shaft operation hole 55a extends in a direction perpendicular to the centerline C. As shown in FIG. In the example of this embodiment, the shaft operation hole 55a is formed through the operation portion 55 in a direction orthogonal to the center line C. As shown in FIG. A working tool such as a wrench (not shown) is inserted into the shaft operation hole 55a.

The nut member 52 has a cylindrical shape centered on the center line C or a circular ring plate shape. The outer diameter of the nut member 52 is larger than the outer diameter of the shaft member 51 . As shown in FIG. 5, the inner peripheral surface of the nut member 52 is formed with a female screw portion. The nut member 52 is screwed onto the second screw shaft 54 . A nut operation hole 52 a is opened in the outer peripheral surface of the nut member 52 . A plurality of nut operation holes 52a (for example, five at equal intervals) are provided around the center line C on the outer peripheral surface of the nut member 52 at intervals. The nut operation hole 52a extends in a direction orthogonal to the center line C. As shown in FIG. In the example of this embodiment, the nut operation hole 52a is a blind hole with a bottom. A working 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, in the adjusting portion 50 attached to the tool body 2 , the radially outer end positioned furthest to the radially outer side of the tool body 2 is the portion of the outer peripheral surface of the nut member 52 . The radial position of the radial outer end of the adjustment portion 50 is radially inside the radial position of the radial outer end (peripheral cutting edge 7 b ) of the cutting edge portion 30 .

The tip surface of the nut member 52 contacts the rear end surface of the cutting edge portion 30 from the rear end side.
Therefore, 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 in a state in which the clamp screw 19 is loosened or temporarily tightened, cutting can be performed. The axial position of the blade portion 30 is adjusted. That is, by operating the working tool to rotate either the shaft member 51 or the nut member 52 around the center line C, the axial direction of the cutting edge portion 30 and the cutting edge 7 relative to the insert mounting seat 4 is changed. position is adjustable. After the position of the cutting edge 30 is adjusted, the clamp screw 19 is screwed and fully tightened to fix the cutting edge 30 to the insert mounting seat 4 . By adjusting either the screwing amount of the shaft member 51 to the tool body 2 or the screwing amount of the nut member 52 to the shaft member 51 in a state where the clamp screw 19 is fully tightened, the shaft of the cutting edge portion 30 can be adjusted. You may fine-tune the position of the direction.

[Description 3 of the tool body]
Portions of the tool body 2 other than those described above will be described.
As shown in FIGS. 4 , 5 , 7 and 8 , the support portion 24 is arranged on the rear end side of the adjustment portion 50 in the axial direction and supports the adjustment 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, ten or more (for example, twenty) support portions 24 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 body portion 21 .

The support portion 24 has a rib shape extending in the axial direction. The support portion 24 protrudes radially outward from the outer peripheral surface of the tool body 2 . The support portion 24 protrudes radially outward from a portion 2a adjacent to the support portion 24 in the circumferential direction (portion opposed in the circumferential direction) of the outer peripheral surface of the tool body 2 . In addition, the said part 2a may be paraphrased as the part 2a between the support parts 24 adjoining in the circumferential direction among the outer peripheral surfaces of the tool main body 2. As shown in FIG.
The support portion 24 protrudes radially outward from a portion (recess portion 25 ) adjacent to the tip side of the support portion 24 in the outer peripheral surface of the tool body 2 .

The support portion 24 has an axially extending screw hole 24a. The screw hole 24 a passes through 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. A first screw shaft 53 is screwed into the screw hole 24a.
When viewed from the axial direction, the support portion 24, the adjustment portion 50, the insert mounting seat 4, and the cutting edge portion 30 are arranged so as to overlap each other.

As shown in FIG. 6, of the outer peripheral surface of the tool body 2, the radial position of the portion 2b between the adjusting portions 50 adjacent in the circumferential direction is greater than the radial position of the adjusting portion 50. is inside the In other words, the adjustment portion 50 is arranged to protrude radially outward from the portion 2b between the adjustment portions 50 adjacent in the circumferential direction on the outer peripheral surface of the tool body 2 . In the example of this embodiment, of the outer peripheral surface of the tool body 2, the radial position of the portion 2b between the adjusting portions 50 adjacent in the circumferential direction is greater than the radial position of the center line C of the adjusting portion 50. is also radially inward. Note that the portion 2b may also be referred to as a portion (a portion facing in the circumferential direction) 2b of the outer peripheral surface of the tool body 2 that is adjacent to the adjusting portion 50 in the circumferential direction.

In a cross-sectional view perpendicular to the central axis O shown in FIG. 6, the portion 2b has an arc shape with the central axis O as the center. In the axial region (range) where the portion 2b is arranged in the outer peripheral surface of the tool body 2, the radial position of the portion 2b is larger than the radial positions of the portions other than the portion 2b. Outward direction. That is, the portion 2b forms the outermost diameter portion of the outer peripheral surface of the tool body 2 in the axial region where the portion 2b is arranged. Therefore, when manufacturing the tool body 2 (outer body portion 21), the portion 2b can be formed by turning.

As shown in FIG. 8, in the example of the present embodiment, the radial position of the portion 2b between the adjustment portions 50 adjacent in the circumferential direction on the outer peripheral surface of the tool body 2 is the position of the outer peripheral surface of the tool body 2. It is radially outside the position in the radial direction of the portion 2a between the support portions 24 adjacent in the circumferential direction.
A portion of the outer peripheral surface of the tool body 2 adjacent to the tip side of the portion 2b protrudes radially outward from the portion 2b.

As shown in FIG. 4, when viewed from the radial direction, the recessed portion 25 is arranged at a position overlapping the adjustment portion 50 on the outer peripheral surface of the tool body 2 (outer main body portion 21) and recessed radially inward. The number of recessed portions 25 is the same as the number of adjusting portions 50 , and in the example of the present embodiment, ten or more (for example, twenty) recessed portions 25 are provided on the outer periphery of the tool body 2 .

In the example of this embodiment, the recessed portion 25 has a rectangular hole shape. The recess 25 extends axially. The recessed portion 25 is circumferentially adjacent to the portion 2b between the circumferentially adjacent adjustment portions 50 on the outer peripheral surface of the tool body 2 . The recessed portion 25 is arranged between the circumferentially adjacent portions 2b of the outer peripheral surface of the tool body 2 . The recessed portion 25 is arranged radially inward of the portion 2b. In other words, the radial position of the portion 2 b is radially outside the radial position of the recessed portion 25 .

As shown in FIG. 5 , part of the adjustment portion 50 is arranged within the recessed portion 25 . In the illustrated example, a portion of the operation portion 55 (the radially inner end) and a portion of the nut member 52 (the radially inner end) of the adjustment portion 50 are positioned within the recessed portion 25 . do. As shown in FIG. 6, when viewed from the axial direction, a portion of the operation portion 55 (the radially inner end), a portion of the nut member 52 (the radially inner end), and the recessed portion 25 are , are placed on top of each other.

[Effects of this embodiment]
According to the indexable milling cutter 1 of the present embodiment described above, the radial position of the portion 2b between the adjusting portions 50 adjacent in the circumferential direction on the outer peripheral surface of the tool body 2 is the same as that of the adjusting portion 50. It is arranged radially inside the radial position. Therefore, when adjusting the axial position of the cutting edge portion 30 by operating the adjusting portion 50, the portion 2b between the adjusting portions 50 on the outer peripheral surface of the tool body 2 is less likely to interfere with the adjustment work. That is, it is possible to prevent a working tool such as a wrench used when operating the adjusting portion 50 from coming into contact with (the portion 2b of) the outer peripheral surface of the tool body 2 . Therefore, workability of adjusting the position of the cutting edge portion 30 is improved.

In addition, since the radial position of the portion 2b between the adjusting portions 50 adjacent in the circumferential direction on the outer peripheral surface of the tool body 2 is radially inner than the radial position of the adjusting portion 50, the tool Excessive thickness from the outer peripheral surface of the main body 2, that is, metal portions that are not necessary for securing the rigidity of the tool can be reduced, and the weight of the tool can be reduced.

Further, in the present embodiment, the support portion 24 protrudes radially outward 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. That is, the radial position of the portion 2 a is arranged radially inside the radial position of the support portion 24 . As a result, excess thickness 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 this embodiment, by adjusting either the amount of screwing of the shaft member 51 into the tool body 2 (supporting portion 24) or the amount of screwing of the nut member 52 into the shaft member 51, the axial direction of the cutting edge portion 30 can be adjusted. position is adjusted.
Then, when adjusting either the screwing amount of the shaft member 51 or the screwing amount of the nut member 52, on the outer peripheral surface of the tool body 2, the portion 2b between the adjusting portions 50 adjacent in the circumferential direction becomes an obstacle. Hateful. That is, as described above, since the portion 2b between the adjusting portions 50 is arranged radially inward of the adjusting portion 50, the work of screwing the shaft member 51 and the nut member 52 is facilitated, and the cutting edge portion 30 The workability of the position adjustment of is enhanced.

Further, in the present embodiment, the radial position of the portion 2b between the adjusting portions 50 adjacent in the circumferential direction on the outer peripheral surface of the tool body 2 is higher than the radial position of the center line C of the adjusting portion 50. , radially inward.
Therefore, a working tool such as a wrench for operating the adjusting portion 50 can be prevented from coming into contact with (the portion 2b of) the outer peripheral surface of the tool body 2, and workability of adjusting the position of the cutting edge portion 30 can be improved. improves. In addition, in the portion 2b between the adjusting portions 50 of the outer peripheral surface of the tool body 2, excess thickness can be further reduced, and the weight of the tool can be reduced.

Further, in the present embodiment, part of the adjusting portion 50 is arranged inside the recessed portion 25 .
For this reason, for example, the outer diameter of the adjustment portion 50 can be increased by the amount of the arrangement in the recess portion 25, and the adjustment work (particularly, fine adjustment by rotational operation around the center line C) is facilitated.

Further, in the present embodiment, the radial position of the portion 2b between the adjusting portions 50 adjacent in the circumferential direction on the outer peripheral surface of the tool body 2 is greater than the radial position of the recessed portion 25. outside.
Therefore, it is possible to prevent the portion 2b from being excessively retracted inward in the radial direction, thereby making it easier to secure the rigidity of the tool body 2 to a predetermined level or more.

In addition, in the present embodiment, the radial position of the radial outer end of (the nut member 52 of) the adjusting portion 50 is higher than the radial position of the radial outer end of (the cutting edge 7 of) the cutting edge portion 30. radially inward.
That is, since the adjusting portion 50 is arranged radially inward of the cutting edge portion 30 , it is possible to suppress an increase in the outer diameter of the tool due to the provision of the adjusting portion 50 . In addition, since the adjusting portion 50 is prevented from coming into contact with the work material during cutting, the degree of freedom in the machining mode (machining conditions) increases.

Moreover, in this 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 .
For this reason, the outer body portion 21 of the tool body 2, which requires high rigidity, is made of, for example, a steel material that easily secures rigidity, and the inner body portion 22 is made of a lightweight material, such as an aluminum material. 2 total weight can be reduced. That is, the weight of the tool can be reduced according to the present embodiment, for example, as compared with the case where the entire tool body is made of steel unlike the present embodiment. Therefore, the weight of the tool can be reduced while ensuring the rigidity of the tool.

Further, in this embodiment, since the space 23 is provided between the outer main body 21 and the inner main body 22, the weight of the tool main body 2 can be reduced by hollowing out, and the weight of the tool can be further reduced.
In the present embodiment, part of the space 23 (second space 23b) is used as a channel portion of the coolant hole 3. As shown in FIG. Therefore, the coolant can be temporarily stored in a part of the space 23, and the amount of coolant jetted to the cutting edge portion 30 can be stabilized. Ejection balance can be easily equalized.

Further, in the present embodiment, the cutting edge portion 30 is detachably attached to the tip outer peripheral portion (insert mounting seat 4) of the tool body 2. As shown in FIG.
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 its tool life, it can be replaced with another new cutting edge portion 30 to maintain good machining accuracy. In addition, it is possible to prepare a plurality of types of cutting edge portions 30 having various cutting edges 7 and selectively use them according to the type of work material, processing mode, and the like.

[Other configurations included in the present invention]
It should be noted that the present invention is not limited to the above-described embodiments, and, for example, as described below, changes in configuration can be made without departing from the gist of the present invention.

In the above-described embodiment, the shaft operation hole 55a is opened in the outer peripheral surface of the operation portion 55 of the shaft member 51, and the nut operation hole 52a is opened in 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 to rotate the shaft member 51 and the nut member 52 around the center line C. As shown in FIG. Not limited to this, for example, the outer peripheral surface of the operating portion 55 and the outer peripheral surface of the nut member 52 may have a polygonal shape such as a hexagon in 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 with a working tool such as a spanner.
In addition, the adjusting portion 50 is only required to press the cutting edge portion 30 toward the distal end side in the axial direction and adjust the axial position of the cutting edge portion 30. is not limited to

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

In addition, within the scope that does not deviate from the spirit of the present invention, each configuration (component) described in the above-described embodiments, modifications, notes, etc. may be combined, and addition, omission, replacement, and other Change is possible. Moreover, the present invention is not limited by the embodiments described above, but only by the claims.

1 … Indexable milling cutter (milling tool)
2 Tool main body 2a A portion of the outer peripheral surface of the tool main body that is adjacent to the supporting portion in the circumferential direction 2b A portion of the outer peripheral surface of the tool main body that is between the adjustment portions that are adjacent to each other in the circumferential direction 21 Outside Body portion 22 Inner body portion 23 Space portion 24 Support portion 25 Recess portion 30 Cutting blade portion 50 Adjusting portion 51 Shaft member 52 Nut member C Center line O Central axis

Claims (5)

a tool body that can be rotated around a central axis;
a plurality of cutting edge portions arranged at intervals in the circumferential direction on the tip outer peripheral portion of the tool body;
a plurality of adjustment units arranged on the outer circumference of the tool body at intervals in the circumferential direction, and for adjusting the axial position of the cutting edge by pressing the cutting edge toward the distal end side in the axial direction; with
A radial position of a portion of the outer peripheral surface of the tool body between the adjusting portions adjacent in the circumferential direction is radially inner than a radial position of the adjusting portion ,
The tool body has a support portion arranged on the rear end side of the adjustment portion in the axial direction to support the adjustment portion,
The milling tool , wherein the support portion protrudes radially outward from a portion of the outer peripheral surface of the tool body that is adjacent to the support portion in the circumferential direction . a tool body that can be rotated around a central axis;
a plurality of cutting edge portions arranged at intervals in the circumferential direction on the tip outer peripheral portion of the tool body;
a plurality of adjustment units arranged on the outer circumference of the tool body at intervals in the circumferential direction, and for adjusting the axial position of the cutting edge by pressing the cutting edge toward the distal end side in the axial direction; with
A radial position of a portion of the outer peripheral surface of the tool body between the adjusting portions adjacent in the circumferential direction is radially inner than a radial position of the adjusting portion,
The adjustment unit
a shaft member screwed to the tool body;
a nut member screwed to the shaft member and in contact with the cutting edge,
The axial position of the cutting edge is adjusted by adjusting either the amount of screwing of the shaft member into the tool body or the amount of screwing of the nut member into the shaft member,
the center line of the shaft member extends along the axial direction of the tool body,
A milling tool, wherein a radial position of a portion of the outer peripheral surface of the tool body between the adjusting portions that are adjacent in the circumferential direction is radially inside the radial position of the center line. . a tool body that can be rotated around a central axis;
a plurality of cutting edge portions arranged at intervals in the circumferential direction on the tip outer peripheral portion of the tool body;
a plurality of adjustment units arranged on the outer circumference of the tool body at intervals in the circumferential direction, and for adjusting the axial position of the cutting edge by pressing the cutting edge toward the distal end side in the axial direction; with
A radial position of a portion of the outer peripheral surface of the tool body between the adjusting portions adjacent in the circumferential direction is radially inner than a radial position of the adjusting portion,
The tool body is
a bottomed cylindrical outer main body;
an inner body portion disposed inside the outer body portion;
the specific gravity of the inner body portion is smaller than the specific gravity of the outer body portion;
The milling tool, wherein the tool body has a space located between the outer body portion and the inner body portion. The milling tool according to any one of claims 1 to 3 ,
The tool body has a recessed portion that is disposed at a position that overlaps with the adjustment portion on the outer peripheral surface of the tool body as viewed in the radial direction and is recessed radially inward,
A milling tool, wherein a portion of the adjustment portion is disposed within the recess. A milling tool according to claim 4 ,
A milling tool, wherein the radial position of a portion of the outer peripheral surface of the tool body between the adjusting portions adjacent in the circumferential direction is radially outside the radial position of the recessed portion. .

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