JP2016087783A - Fitting mechanism of cutting insert, tip rotary milling tool and tip rotary turning tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress uneven wear of a sheet member and an insert fitting seat to successfully maintain seating stability of the cutting insert, thereby stably performing highly accurate cutting work.SOLUTION: A plurality of sheet members 21, 22 are interposed by being overlapped with each other in a direction of an insert axis C between a cutting insert 3 and an insert fitting seat 4, a first sheet member 21 contacting the insert fitting seat 4 of the plurality of sheet members 21, 22 is non-rotatably provided around the insert axis C to the insert fitting seat 4, and the second sheet member 22 contacting the cutting insert 3 is rotatably provided around the insert axis C with respect to the cutting insert 3 adjacent to both sides in a direction of the insert axis C of the second sheet member 22, and with respect to the other sheet member 21.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a cutting insert mounting mechanism in which a disc-shaped cutting insert is rotatable about its insert axis and is mounted on an insert mounting seat, as well as a cutting edge rotating milling tool and a cutting edge rotating type using the cutting insert mounting mechanism. It relates to turning tools.

Conventionally, for example, those described in Patent Documents 1 and 2 below are known as cutting edge rotating milling tools (rotary milling tools) for milling (rolling) difficult-to-cut materials (work materials) such as heat-resistant alloys. ing.
The cutting edge rotating milling tool of Patent Documents 1 and 2 is a disk-shaped cutting insert having a cutting edge on the outer peripheral edge thereof, which is mounted on the insert mounting seat so that it can be rotated around its insert axis. It has a mechanism. The cutting insert is made of cemented carbide or the like, and the insert mounting seat is formed on the outer periphery of the tip of the tool body made of steel or the like.
A sheet member made of steel or the like is interposed between the cutting insert and the insert mounting seat. The seat member is disposed on the insert mounting seat in a state where rotation about the insert axis is restricted with respect to the insert mounting seat or in a state where rotation is allowed.

  At the time of cutting, the cutting insert cuts into the work material with the cutting edge, and the force received from the work material at this time (the cutting force or the cutting resistance, including the component of the cutting edge force or the edge force, the same applies hereinafter) The cutting insert is driven and rotated around the insert axis with respect to the insert mounting seat. In this way, by cutting while the cutting insert is rotated, the entire circular cutting edge is uniformly used for cutting, so that the partial cutting of the cutting edge, the cutting edge loss, and the like are prevented. .

JP 2014-12308 A JP 2014-12309 A

However, the conventional cutting insert mounting mechanism has the following problems.
That is, the sheet member and the insert mounting seat may be reduced (partially worn) by the force received from the work material during cutting. Specifically, the force that the cutting insert receives from the work material during cutting increases at a predetermined position near the cutting edge of the cutting insert that cuts into the work material. The seat part was easy to wear early compared to the other parts.
The predetermined position is a predetermined position at which the cutting insert that is mounted on the insert mounting seat and rotates is cut into the work material. That is, it does not rotate with the cutting insert, but with respect to the insert mounting seat (tool body). This is a predetermined position that hardly moves.

That is, when the seat member is provided in a state where the rotational movement around the insert axis is restricted with respect to the insert mounting seat, the cutting insert side in the insert axial direction of the seat member is caused by friction with the rotating cutting insert. The facing surface wears out unevenly early.
In addition, when the seat member is provided in a state in which the rotational movement around the insert axis is allowed with respect to the insert mounting seat, friction between the cutting member and the seat member rotating as the cutting insert rotates causes the insert mounting seat to The surface facing the sheet member side in the insert axial direction wears unevenly at an early stage.

When such uneven wear occurs, the seating stability of the cutting insert cannot be ensured, rattling occurs, and it becomes difficult to ensure cutting accuracy.
In particular, in cutting using a difficult-to-cut material such as a heat-resistant alloy as a work material, the load in the insert axial direction transmitted to the sheet member or the insert mounting seat via the cutting insert becomes large at the time of cutting, for example, 3000 N Therefore, the above problem is likely to be remarkable.

  The present invention has been made in view of such circumstances, and can suppress uneven wear of the seat member and the insert mounting seat and maintain good seating stability of the cutting insert. It is an object of the present invention to provide a cutting insert mounting mechanism capable of stably performing accurate cutting, and a cutting edge rotating milling tool and a cutting edge rotating turning tool using the cutting insert mounting mechanism.

In order to solve such problems and achieve the above object, the present invention proposes the following means.
That is, the present invention includes a cutting insert having a disc shape and having a circular cutting edge extending around the insert axis, and an insert mounting seat on which the cutting insert is rotatably mounted about the insert axis. A cutting insert mounting mechanism, wherein a plurality of sheet members are interposed between the cutting insert and the insert mounting seat in the insert axial direction, and the insert mounting seat among the plurality of sheet members. The first sheet member in contact with the insert mounting seat is provided so as not to rotate about the insert axis with respect to the insert mounting seat, and the second sheet member in contact with the cutting insert is the second sheet member. For the cutting insert and other sheet members adjacent to both sides in the insert axial direction of the insert axial line Wherein the rotatably provided Ri.

In this cutting insert mounting mechanism, during cutting, the cutting insert is cut into the work material with a cutting edge, and the cutting insert is driven and rotated around the insert axis relative to the insert mounting seat by the force received from the work material at this time. It is done.
A plurality of sheet members are interposed between the cutting insert and the insert mounting seat, and among these sheet members, the first sheet member disposed adjacently immediately above the insert mounting seat is an insert mounting. While being non-rotatable with respect to the seat, the second sheet member disposed adjacently immediately below the cutting insert is rotated (rotated) around the insert axis along with the rotation of the cutting insert.

  According to the present invention, since the rotation of the first seat member with respect to the insert mounting seat is restricted, the friction between the insert mounting seat and the first seat member is suppressed, and the insert mounting which has been a problem in the related art. Uneven wear of the seat can be prevented. Therefore, a tool body such as a holder in which the insert mounting seat is formed can be used stably over a long period of time.

  Further, the second sheet member is rotatable with respect to the cutting insert and other sheet members adjacent to both sides in the insert axial direction, that is, the second sheet member is connected to the cutting insert and other sheet members. Since, for example, the hardness of the second sheet member can be made equal to or less than the hardness of the cutting insert and the other sheet member. Therefore, it is possible to wear the second sheet member preferentially by friction with the cutting insert or other sheet members.

The wear of the second sheet member progresses over the entire circumference of the second sheet member around the insert axis as the second sheet member rotates. That is, since the second sheet member is evenly worn around the insert axis, uneven wear is unlikely to occur.
Thus, according to the present invention, uneven wear of the plurality of seat members and the insert mounting seat can be suppressed, so that the seating stability of the cutting insert can be maintained well.

  Furthermore, while the effect of preventing uneven wear is obtained as described above, the entire cutting insert mounting mechanism can save space. That is, since the present invention employs a simple configuration in which a plurality of sheet members are interposed between the cutting insert and the insert mounting seat, for example, the number of sheet members (thickness) increased from the conventional configuration. Accordingly, it is easy to form the entire mechanism compactly by reducing the thickness of the cutting insert or by retracting the position of the insert mounting seat so as to be equal to or greater than this thickness. Therefore, it is easy to meet demands for various cutting modes.

As described above, according to the present invention, uneven wear of the seat member and the insert mounting seat is suppressed, and the seating stability of the cutting insert can be maintained satisfactorily, thereby stably performing high-precision cutting. be able to.
Moreover, it is easy to form the whole cutting insert mounting mechanism compactly, and space saving can be achieved.

  In the cutting insert mounting mechanism according to the present invention, it is preferable that the cutting insert includes a biasing unit that biases the cutting insert in the insert axial direction with respect to the second sheet member.

In this case, since the urging means urges the cutting insert toward the second sheet member, the cutting insert is brought into close contact with the second sheet member and rattling is suppressed, so that the cutting insert during cutting is suppressed. It is possible to significantly improve the seating stability.
Specifically, the cutting insert urged by the urging means is rotated only by the force received when it is cut into the work material, so that it is easy to give the desired amount of rotation for each cut and is stable. Rotation is easy to obtain.

That is, unlike the above-described configuration, in the cutting insert that is simply rotated and not biased by the biasing means, during cutting, centrifugal force other than the force that the cutting insert receives from the work material or other inertial force, Since various forces such as the force due to contact with chips and coolant act and the cutting insert is rotated irregularly, it is difficult to give the cutting insert the desired amount of rotation for each notch and stable rotation is achieved. It may be difficult to obtain.
On the other hand, according to the above-described configuration of the present invention, it becomes easy to stably give the expected rotation to the cutting insert, and the entire cutting edge of the cutting insert contributes to the cutting process evenly (evenly). A good cutting state can be stably maintained.

  Further, in the cutting insert mounting mechanism according to the present invention, the cutting insert is formed with a through-hole extending on the insert axis and opening on the front and back surfaces intersecting the insert axis. A support shaft that is mounted on a mounting seat and rotatably supports the cutting insert about the insert axis; the support shaft is inserted into the through hole and is attached to the insert mounting seat; A head portion connected to the shaft portion, having a diameter larger than the inner diameter of the through hole, and having a head disposed with a gap between the front and back surfaces of the cutting insert, It is preferable that the movement of the support shaft relative to the insert mounting seat in the insert axis direction is restricted.

  In this case, the cutting insert is driven and rotated with respect to the insert mounting seat while being supported from the inside of the insert radial direction orthogonal to the insert axis by the shaft portion of the support shaft inserted through the through hole, and It is retained by the head of the support shaft. And the clearance (clearance) between the head of a support shaft and the surface of a cutting insert can be set to the expected value, and the movement to the insert axial direction of the support shaft with respect to an insert mounting seat can be controlled.

  Therefore, the cutting insert can be stably rotated around the insert axis by the support shaft. Further, the support shaft can restrict the movement of the cutting insert (and the plurality of sheet members) so as to be largely separated from the insert mounting seat in the insert axial direction, thereby suppressing the occurrence of rattling.

  Further, in the cutting insert mounting mechanism of the present invention, the position of the support shaft relative to the insert mounting seat in the insert axial direction can be adjusted, and the head can be brought into contact with the surface of the cutting insert. The shaft portion includes a screw portion screwed to the insert mounting seat, and a locked portion having a polygonal cross section perpendicular to the central axis of the shaft portion. A locking portion that is capable of abutting on one of a plurality of flat surfaces formed around the central axis and restricts rotation of the support shaft around the central axis relative to the insert mounting seat; Is preferred.

In this case, the clearance (clearance) between the head of the support shaft and the surface of the cutting insert can be set to an expected value by adjusting the position of the support shaft in the insert axis direction relative to the insert mounting seat. After this adjustment, the movement of the support shaft relative to the insert mounting seat in the insert axial direction can be restricted. Specifically, by adjusting the degree to which the screw part formed on the shaft part of the support shaft is screwed into the insert mounting seat (screwing amount), the support shaft is moved toward the center axis direction of the shaft part with respect to the insert mounting seat (insert axis direction). ) Can be moved with high accuracy, and fine adjustment of the position of the support shaft is easy.
In addition, among the locked portions having a polygonal cross section formed on the shaft portion of the support shaft, the support shaft is reliably rotated with respect to the insert mounting seat by bringing the locking portion into contact with one flat surface. It is possible to restrict the movement of the support shaft in the insert axis direction.

  Further, for example, when the second sheet member is evenly worn in the circumferential direction around the insert axis, and the thickness of the second sheet member in the insert axis direction is reduced, the cutting insert and the insert mounting seat By moving the support shaft in the insert axial direction in accordance with the amount of decrease in the distance between them, the position can be finely adjusted so that the desired gap (clearance) is obtained. Further, after the fine adjustment, the position of the support shaft can be fixed to maintain the desired gap.

Specifically, the clearance (clearance) between the head of the support shaft and the surface of the cutting insert can be easily set to a desired value by the procedure described below.
That is, first, the screw portion of the support shaft is screwed into the insert mounting seat until the head of the support shaft contacts the surface of the cutting insert. When the head of the support shaft comes into contact with the surface of the cutting insert, the locking portion is brought into contact with the locked portion of the support shaft.

At this time, when the locking portion comes into contact with a portion other than the portion closest to the central axis on the flat surface of the locked portion (that is, the portion having the smallest diameter among the locked portions), the support shaft is Since it can be rotated around the insert axis (screwing into the insert mounting seat can be loosened), the support shaft is slightly rotated toward the loose side of the screw.
In addition, it is preferable that the angle which rotates a support shaft in this case (rotation angle around a central axis) is below one outer angle of the polygon which appears in the cross section of a to-be-latched part. Specifically, for example, when the locked portion has a regular hexagonal cross section, the rotation angle is 60 ° or less. Further, when the locked portion has a regular octagonal cross section, the rotation angle is 45 ° or less.

  Then, the locking portion is again brought into contact with the locked portion. By repeating this operation, the locking portion comes into contact with the flat surface of the locked portion from the front (that is, contacts with the portion having the smallest diameter of the flat surface). The rotation is restricted, and the movement of the support shaft in the central axis direction (insert axis direction) is also restricted.

As a result, a predetermined gap (clearance) is formed between the head of the support shaft and the surface of the cutting insert according to the screw pitch of the screw portion of the support shaft and the rotation angle. Specifically, for example, when the screw pitch (lead) of the threaded portion of the support shaft is 0.5 mm toward the central axis per circumference around the central axis, the head of the support shaft contacts the surface of the cutting insert. From the state, when the support shaft is rotated to the loose side of the screw within a range of 60 ° or less and fixed by the locking portion, 0.5 mm × 60 ° / 360 ° = 0.0833 mm, 0.0833 mm or less The clearance (clearance) can be accurately set. In addition, when the support shaft is rotated to the loose side of the screw within a range of 45 ° or less and fixed by the locking portion, 0.5 mm × 45 ° / 360 ° = 0.0625 mm, 0.0625 mm or less The gap (clearance) can be set with high accuracy.
In addition, it is preferable that the said clearance gap is set to the range of 0.01-0.6 mm, for example, More desirably, it sets to the range of 0.03-0.2 mm.

In addition, when the locking portion comes into contact with the flat surface of the locked portion from the front (contacts with the smallest diameter portion of the flat surface) from the beginning, this contact further increases the support shaft. Since the rotation is restricted, after the locking portion is once retracted from the flat surface, the support shaft is slightly rotated to the loose side of the screw, and the operation may be performed in the same procedure as described above.
As described above, according to the above configuration, the centering of the support shaft in the center axis direction (insert axis direction) can be accurately and easily performed without requiring skill of the operator. The clearance (clearance) with the surface of the cutting insert can be set with high accuracy.

  Further, in the cutting insert mounting mechanism of the present invention, the shaft portion is located between the male screw portion located at the tip of the shaft portion, the male screw portion and the head, and the male screw portion. And a contact step formed between the male screw portion and the shaft body, and the insert mounting seat is mounted with the support shaft. A support shaft mounting hole, wherein the support shaft mounting hole is formed with a female screw portion into which the male screw portion is screwed, and an insertion hole formed with a larger diameter than the female screw portion and through which the shaft main body is inserted. And a contacted step portion that is formed between the female screw portion and the insertion hole portion and is in contact with the contact step portion, and is capable of contacting the shaft main body. In addition, it is preferable that a locking portion for restricting rotation of the shaft portion around the central axis with respect to the support shaft mounting hole is provided.

In this case, the male screw portion of the shaft portion of the support shaft is screwed into the female screw portion of the support shaft mounting hole of the insert mounting seat, and the shaft portion comes into contact with the contacted step portion of the support shaft mounting hole. By abutting the stepped portion, the support shaft is stably erected on the insert mounting seat. That is, since the position of the shaft portion in the central axis direction with respect to the support shaft mounting hole is stably suppressed, the axial force of the shaft portion can be increased, and the cutting insert is stably supported by the shaft portion. It becomes possible to do.
Then, the rotation of the support shaft with respect to the insert mounting seat is restricted while the rotation of the shaft portion around the central shaft with respect to the support shaft mounting hole is restricted by bringing the locking portion into contact with the shaft body of the shaft portion. The movement of the support shaft in the insert axis direction can be restricted.

  In the cutting insert mounting mechanism of the present invention, the cutting insert is urged in the insert axial direction with respect to the second sheet member between the head of the support shaft and the cutting insert. It is preferable that a compression spring is interposed as the biasing means.

  In this case, the urging means capable of obtaining the above-described effects can be easily formed by a compression spring such as a compression coil spring or a disc spring, and manufacturing and maintenance of the cutting insert attachment mechanism are easy.

  Further, in the cutting insert mounting mechanism of the present invention, the second sheet member is more than the hardness of each of the cutting insert and the other sheet members adjacent to both sides in the insert axial direction of the second sheet member. It is preferably formed of a material having a low hardness.

  In this case, the effect of the present invention described above that the second sheet member can be preferentially worn by friction with the cutting insert and other sheet members to suppress uneven wear is more reliably achieved. .

  In the cutting insert attachment mechanism of the present invention, it is preferable that the first sheet member is formed of cemented carbide and the second sheet member is formed of steel.

In this case, wear of the first sheet member can be remarkably prevented.
Further, the second sheet member can be easily manufactured, and the manufacturing cost can be reduced. Further, even when a large force (such as a high load in the insert axial direction) acts on the second sheet member during cutting, the second sheet member is less likely to be damaged due to toughness. In addition, as a steel material, it is preferable to use a high hardness thing among steel materials, such as SKD, for example.

  Moreover, in the attachment mechanism of the cutting insert of this invention, the back surface which contact | abuts to the said 2nd sheet member among the front and back surfaces which cross | intersect the said insert axis line of the said cutting insert, and the said insert axis line of the said 2nd sheet member It is preferable that a lubricating coating is formed on at least one of the front and back surfaces intersecting with the cutting insert.

In this case, a lubricating coating is formed on one or both of the back surface of the cutting insert and the surface of the second sheet member that contacts the back surface, that is, the cutting insert and the second sheet member. Since the lubricating coating is interposed between them, they can be slid easily and stably, and the cutting insert and the second sheet member are stably rotated about the insert axis.
In addition, when a lubricating film is formed in the back surface of the cutting insert which is a member rotated by the force received from a cut material, the partial wear of a film can be prevented and it is more preferable.

  Moreover, in the attachment mechanism of the cutting insert of this invention, the back surface contact | abutted to the said other sheet member among the front and back surfaces which cross | intersect the said insert axis line of the said 2nd sheet member, and the said insert of the said other sheet member It is preferable that a lubricant film is formed on at least one of the front and back surfaces intersecting the axis line and the surface in contact with the second sheet member.

In this case, a lubricant film is formed on one or both of the back surface of the second sheet member and the surface of the other sheet member that contacts the back surface, that is, the second sheet member and the other sheet member Since the lubricating film is interposed between the sheet member and the sheet member, they can be stably slid and the second sheet member and the other sheet member can be stably rotated relative to the insert axis. .
In addition, when a lubricating film is formed in the back surface of the 2nd sheet | seat member which is a member rotated by the force received from a cut material, the partial wear of a film can be prevented and it is more preferable.

As described above, the lubricating film is provided between the cutting insert and the second sheet member or / and between the second sheet member and the other sheet member, so that it is received from the work material during cutting. Due to the force, the cutting insert and the second sheet member easily rotate stably, and the effect of suppressing the above-described uneven wear becomes more remarkable.
Furthermore, since the lubricating film is interposed between the members adjacent to each other in the insert axial direction, these members that come into contact with each other through the lubricating film are easily slipped, and the wear of these members (particularly the second sheet member) itself. Can be remarkably suppressed.

More specifically, the following three modes are conceivable for the rotation state of the second sheet member around the insert axis.
1. A mode that rotates due to frictional resistance with the cutting insert.
2. A mode that prevents rotation due to frictional resistance with other sheet members.
3. Above 1.2. A mode in which rotation is mixed (a mode in which rotation and rotation stop are repeated alternately).
And according to the said structure of this invention, when a lubricating film is provided, said 2. This mode can be surely avoided.

  In the cutting insert mounting mechanism of the present invention, the lubricating coating is preferably any one of a film made of a lubricant, a PVD film, and a plating film.

As described above, the lubricating coating is formed of any one of a film made of a lubricant, a PVD film, and a plating film, so that high lubrication performance can be stably achieved without substantially requiring maintenance of the lubricating coating. Can be maintained.
Specifically, when the lubricating film is formed of a film made of a lubricant, the lubricating film can be easily produced, and various desired performances (friction resistance, rotational force, life, etc.) Can be stably provided. Further, when the lubricating coating is formed of a PVD film or a plating film, it is easy to control the thickness of the lubricating coating while obtaining the desired lubricating performance.

  The cutting edge rotating milling tool according to the present invention includes the above-described cutting insert mounting mechanism and a tool body on which the insert mounting seat is formed.

For example, a plurality of the above-described cutting insert attachment mechanisms are arranged on the outer periphery of the tip of the tool main body that is formed in a columnar shape or a disk shape and is rotated around the tool axis with an interval in the tool circumferential direction around the tool axis. It can be used for a blade-rotating milling tool. In other words, the cutting edge rotating milling tool is configured such that the tool body is rotated about its tool axis and the workpiece is machined.
Since this cutting edge rotating milling tool is equipped with the above-mentioned cutting insert mounting mechanism, it is possible to stably carry out highly accurate milling (milling).

  Moreover, the cutting edge rotating type turning tool of the present invention includes the above-described cutting insert mounting mechanism and a tool body on which the insert mounting seat is formed.

The cutting insert mounting mechanism described above can be employed in, for example, a cutting edge rotating turning tool by disposing it at the tip of an axial tool body. In other words, the cutting edge rotating turning tool is configured to turn a rotating work material.
Since this cutting edge turning type turning tool is provided with the above-mentioned cutting insert mounting mechanism, highly accurate turning (turning) can be performed stably.

  According to the cutting insert mounting mechanism of the present invention, and the cutting edge rotating milling tool and cutting edge rotating turning tool using the cutting insert, the uneven wear of the sheet member and the insert mounting seat is suppressed, and the seating stability of the cutting insert is suppressed. Can be maintained satisfactorily, whereby high-precision cutting can be stably performed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view showing a cutting edge rotating milling tool provided with a cutting insert mounting mechanism according to an embodiment of the present invention (a view of a cutting edge rotating milling tool viewed from the distal end toward the proximal end in the tool axis direction). . It is a side view which shows A arrow of the blade edge | tip rotary milling tool of FIG. It is a side view which shows B arrow of the blade edge | tip rotation milling tool of FIG. It is a perspective view which decomposes | disassembles and shows the attachment mechanism of the cutting insert of the blade-tip rotary milling tool of FIG. It is sectional drawing which shows the attachment mechanism of the cutting insert of the blade edge | tip rotation milling tool of FIG. It is a figure which shows the DD cross section of FIG. It is a perspective view which shows the cutting insert used for the attachment mechanism of the cutting insert which concerns on one Embodiment of this invention. It is a top view of the cutting insert of FIG. It is a sectional side view (longitudinal sectional view) of the cutting insert of FIG. It is the (a) top view and (b) side sectional view (longitudinal sectional view) which show the sheet member used for the cutting insert attachment mechanism concerning one embodiment of the present invention. It is a perspective view which shows the support shaft used for the attachment mechanism of the cutting insert which concerns on one Embodiment of this invention. It is the (a) top view and (b) side view of the support shaft of FIG. It is sectional drawing which shows the modification of the attachment mechanism of the cutting insert which concerns on one Embodiment of this invention. It is a figure which shows the EE cross section of FIG. It is a perspective view which shows the support shaft used for the attachment mechanism of the cutting insert of FIG. It is (a) top view of the support shaft of FIG. 15, (b) It is a side view. FIG. 15 is a cross-sectional view showing a modification of the locking portion in the cutting insert attachment mechanism of FIG. 14.

  Hereinafter, a cutting edge rotating milling tool 30 including a cutting insert mounting mechanism 1 according to an embodiment of the present invention will be described with reference to the drawings.

[Schematic configuration of cutting insert mounting mechanism and cutting edge rotating milling tool]
As shown in FIGS. 1 to 6, the cutting edge rotating milling tool 30 of the present embodiment includes a tool body 2 made of steel or the like, a cutting insert 3 made of a hard material such as cemented carbide, The disc-shaped cutting insert 3 is rotatable about the insert axis C on the insert mounting seat 4 formed on the outer periphery of the tip of the tool body 2 that is rotated about the tool axis O. It is detachably mounted.
The cutting insert 3 is a so-called round piece insert having a circular cutting edge 5 extending around the insert axis C. The cutting insert 3 attached to the insert mounting seat 4 is arranged such that the cutting edge 5 protrudes to the tip side and the radially outer side of the tool body 2.

  The cutting insert mounting mechanism 1 of the present embodiment includes a cutting insert 3, an insert mounting seat 4, and a plurality of sheet members 21 that are interposed between the cutting insert 3 and the insert mounting seat 4 and overlap in the insert axis C direction. , 22 at least. Further, the cutting edge rotating milling tool 30 of the present embodiment includes the cutting insert mounting mechanism 1 and the tool body 2 on which the insert mounting seat 4 is formed.

The cutting edge rotating milling tool 30 has a base end portion (shank portion) of the tool body 2 attached to a main shaft of a machine tool (not shown), and is rotated in a tool rotation direction T around a tool axis O to be a heat resistant alloy. It is used for milling of work materials such as difficult-to-cut materials.
The cutting edge rotating milling tool 30 has a force (cutting force or cutting resistance, which includes a cutting edge force or an edge force component) received by the cutting edge 5 when the cutting insert 3 cuts into the work material and processes the workpiece. This is a rotary milling tool in which the cutting insert 3 is driven (passively) around the insert axis C with respect to the insert mounting seat 4.

[Definition of direction (direction) used in this specification]
In this specification, the insert mounting seat 4 side along the tool axis O direction of the tool body 2 is referred to as the tool tip side (the lower side in FIGS. 2 and 3). What is the insert mounting seat 4 along the tool axis O direction? The opposite side (the main spindle side of the machine tool) is referred to as the tool base end side (the upper side in FIGS. 2 and 3).
A direction perpendicular to the tool axis O is referred to as a tool radial direction. Of the tool radial directions, a direction approaching the tool axis O is referred to as an inner side of the tool radial direction, and a direction away from the tool axis O is defined as a tool radial direction. It is called outside.
In addition, the direction around the tool axis O is referred to as the tool circumferential direction, and the direction in which the tool body 2 is rotated by the main shaft at the time of cutting is referred to as the tool rotation direction T, which is the opposite rotation direction. Is referred to as the side opposite to the tool rotation direction T (that is, the counter tool rotation direction).

The direction in which the insert axis C of the cutting insert 3 extends is referred to as the insert axis C direction. From the top along the insert axis C direction in the longitudinal sectional view (side sectional view) of the cutting insert 3 shown in FIG. The downward direction is referred to as the back surface 10 side from the surface 9 in the insert axis C direction, and the direction from bottom to top along the insert axis C direction is referred to as the front surface 9 side from the back surface 10 in the insert axis C direction. The direction from the front and back surfaces 9 and 10 of the cutting insert 3 along the insert axis C direction to the inside of the insert is referred to as the inside of the insert in the insert axis C direction, and the direction from the insert inside to the front and back surfaces 9 and 10 is the insert. Sometimes referred to as the outside of the insert in the direction of the axis C.
Moreover, the direction orthogonal to the insert axis C is referred to as the insert radial direction. Of the insert radial directions, the direction approaching the insert axis C is referred to as the inside of the insert radial direction, and the direction away from the insert axis C is the insert radial direction. It is called outside.
Further, the direction of turning around the insert axis C is referred to as the insert circumferential direction.

(Tool body)
1 to 4, the tool body 2 has a columnar shape or a disk shape, and is rotated by a main shaft around a tool axis O that is a central axis thereof. In the example of the present embodiment, the tool body 2 has a cylindrical shape, and a portion (shank portion) other than the tip portion is formed to have a larger diameter than the tip portion (blade portion) of the tool body 2. Yes. Further, the tip end portion of the tool main body 2 is reduced in diameter toward the tool tip end side.

  A plurality of chip pockets 6 are formed in the outer periphery of the tip of the tool body 2 so as to be cut out in a concave shape from the outer periphery of the tip, spaced from each other in the tool circumferential direction. In these chip pockets 6, insert mounting seats 4 to which the cutting insert 3 is detachably mounted are formed on the wall surfaces facing the tool rotation direction T, respectively.

  Although not particularly illustrated, the chip pocket 6 may have a coolant hole opened toward the cutting insert 3 attached to the insert mounting seat 4. In this case, the coolant hole is formed so as to extend along the tool axis O direction inside the tool body 2, and penetrates the tool body 2 and is attached to the base end portion of the tool body 2. Communicates with the spindle. An oil-based or water-soluble cutting agent (coolant) flows into the coolant hole through the main shaft, and this cutting agent flows in the coolant hole toward the tip of the tool, and the coolant hole opens into the tip pocket 6. It is ejected from the part toward the cutting insert 3. In addition, the coolant hole does not need to be provided.

Further, between the tip pockets 6 adjacent to each other in the tool circumferential direction at the distal end portion of the tool body 2, an opening is made in the outer peripheral surface of the distal end portion and extends along the tool radial direction to be described later. A screw hole 7 is formed in the support shaft mounting hole 4c.
4 to 6, a female screw (locking portion) 18 is screwed into the screw hole 7. The female screw 18 is accommodated in the screw hole 7 and can protrude into the support shaft mounting hole 4c. is there.

(Insert mounting seat)
In FIG. 4, the insert mounting seat 4 has a mounting surface 4a facing the tool rotation direction T, a wall surface 4b rising from the peripheral edge of the mounting surface 4a, and a support shaft mounting hole 4c drilled in the mounting surface 4a. Is formed. A plurality of disc-shaped sheet members 21 and 22 interposed between the cutting insert 3 and the mounting surface 4a are detachably mounted on the insert mounting seat 4.

The mounting surface 4 a is formed in a substantially circular flat shape corresponding to the shape of the cutting insert 3.
In the side view of the tool body 2 shown in FIG. 3 (side view of the insert mounting seat 4), the mounting surface 4a gradually changes in the tool rotation direction T toward the tool tip side (lower side in FIG. 3) of the tool body 2. Is inclined toward the opposite side (right side in FIG. 3).

  The wall surface 4b is formed so as to rise from the peripheral edge of the mounting surface 4a in the tool rotation direction T. In the example of this embodiment, the inner surface in the tool radial direction from the edge of the mounting surface 4a on the tool proximal side. It is formed so as to extend over the end edge. In the present embodiment, the wall surface 4b has a concave curved surface shape so as to correspond to the outer peripheral shape of the first sheet member 21 to be described later, and the outer periphery of the first sheet member 21 is arranged on the tool proximal side. To the inside in the tool radial direction.

  In the present embodiment, as shown in FIG. 5, a slight gap is provided between the wall surface 4b and the first sheet member 21, but the wall surface 4b is replaced with the first sheet. It is good also as making it contact | abut on the outer periphery of the member 21, and latching. In this case, the wall surface 4 b functions to restrict the rotation of the first seat member 21 around the insert axis C relative to the insert mounting seat 4.

  In FIG. 5, the support shaft mounting hole 4c has a multistage cylindrical hole shape, and the inner diameter of the end portion (opening portion) that opens to the mounting surface 4a in the support shaft mounting hole 4c is deeper than the opening. It is made larger than the inner diameter of the female screw portion 4d that has been provided with the female screw processing. Moreover, the inner diameter of the intermediate part located between the said opening part and the internal thread part 4d among the support shaft mounting holes 4c is the largest in this support shaft mounting hole 4c. In the present embodiment, the support shaft mounting hole 4c is a through hole formed at the tip of the tool body 2 so as to communicate between the tip pockets 6 adjacent in the tool circumferential direction. Thus, a stop hole that opens only on the mounting surface 4a may be used.

[Cutting insert]
As shown in FIGS. 7 to 9, the cutting insert 3 has front and back surfaces 9 and 10 (a front surface 9 and a back surface 10) that intersect the insert axis C (substantially orthogonal to the insert axis C). 10 and the outer peripheral surface 11 connecting the peripheral edges.
The “front and back surfaces 9 and 10 intersecting the insert axis C” as used herein is not limited to the configuration in which the insert axis C directly intersects the front and back surfaces 9 and 10, for example, in the present embodiment. Thus, while the insert axis C is positioned in a through-hole 14 to be described later that opens in the front and back surfaces 9 and 10, the insert axis C passes through the centers (virtual centers) of the front and back surfaces 9 and 10. Contains.
Moreover, the outer peripheral surface 11 has connected the peripheral edges of the front and back surfaces 9 and 10 so that the insert axis C direction may be followed.

  As shown in FIGS. 3 and 5, the front surface 9 of the front and back surfaces 9 and 10 faces the tool rotation direction T in a state where the cutting insert 3 is mounted on the insert mounting seat 4 of the tool body 2. The rear surface 10 is disposed so as to face the side opposite to the tool rotation direction T, and is seated on a second sheet member 22 described later disposed on the insert mounting seat 4.

  7 to 9, the peripheral edge of the surface 9 has a circular shape extending along the circumferential direction of the insert, and a cutting edge 5 disposed on a virtual plane (not shown) orthogonal to the insert axis C is formed. Yes. The cutting edge 5 protrudes from the back surface 10 in the direction of the insert axis C toward the front surface 9 side (the outer side of the insert in the direction of the insert axis C) from the portion other than the cutting edge 5 on the surface 9.

  Further, on the inner surface of the cutting edge 5 in the insert radial direction on the front surface 9, gradually from the cutting edge 5 toward the inner side in the insert radial direction, from the front surface 9 in the insert axis C direction to the back surface 10 side (the insert inner side in the insert axis C direction A tapered rake face 12 is formed which inclines toward).

  In a longitudinal sectional view including the insert axis C of the cutting insert 3 shown in FIG. 9, the rake face 12 is inclined more gradually than the gently inclined portion 12a and the gently inclined portion 12a from the cutting edge 5 toward the inside in the insert radial direction. Are provided in this order. Specifically, the amount of displacement in the direction of the insert axis C per unit length along the insert radial direction in the steeply inclined portion 12b of the rake face 12 is made larger than the amount of displacement in the gently inclined portion 12a.

7 to 9, on the inner side of the rake face 12 on the surface 9 in the insert radial direction, there are two plane portions 13 and 15 perpendicular to the insert axis C, and an insert axis C connecting the plane portions 13 and 15 to each other. And an inner peripheral wall 16 parallel to the inner wall 16 is formed.
The flat portions 13 and 15 each have a circular ring shape. Of these flat portions 13 and 15, the diameter of the flat portion 13 adjacent to the inner side of the rake face 12 in the insert radial direction is a flat portion (head contact) located on the inner side of the flat portion 13 in the insert radial direction. Part) is larger than the diameter of 15. The inner peripheral wall (head accommodating part) 16 connects the inner peripheral edge in the insert radial direction of the large-diameter flat part 13 and the outer peripheral edge in the insert radial direction of the small-diameter flat part 15 in the insert axis C direction. Yes.
A through hole 14 is opened inside the flat portion 15 in the insert radial direction.

  The cutting insert 3 is formed with a through hole 14 that extends on the insert axis C and opens to the front and back surfaces 9 and 10. The through-hole 14 has a multi-stage cylindrical hole shape, and has a large-diameter portion (biasing means accommodating portion) 14a that opens on the front surface 9 and the rear surface 10 side from the front surface 9 in the insert axis C direction to the large-diameter portion 14a And a small diameter portion (shaft support portion) 14b to be disposed. That is, the through hole 14 includes a large diameter portion 14a and a small diameter portion 14b in this order from the front surface 9 in the insert axis C direction toward the back surface 10 side, and the diameter thereof is gradually reduced.

Specifically, the large-diameter portion 14 a of the through hole 14 opens on the inner side in the insert radial direction of the flat portion 15 in the surface 9.
Further, a portion of the through hole 14 that is located on the back surface 10 side from the front surface 9 in the insert axis C direction with respect to the small diameter portion 14b is formed to have a larger diameter than the small diameter portion 14b. ing.

  Further, a portion of the outer peripheral surface 11 of the cutting insert 3 adjacent to the cutting edge 5 is a flank. In the present embodiment, the entire outer peripheral surface 11 is formed in parallel with the insert axis C and has a cylindrical surface shape with the insert axis C as the center, and the cutting insert 3 is a negative insert.

  Moreover, the outer peripheral edge part in the back surface 10 is recessed toward the surface 9 side from the back surface 10 of the insert axis C direction rather than parts other than this outer peripheral edge part. Sites other than the outer peripheral edge and the through hole 14 on the back surface 10 are seating surfaces that are seated on the surface of the second sheet member 22 (the surface facing the cutting insert 3 side), which will be described later. In the example of this embodiment, the back surface 10 (sitting surface) of the cutting insert 3 has a planar shape perpendicular to the insert axis C.

[Multiple sheet members]
As shown in FIGS. 4 and 5, the cutting insert mounting mechanism 1 includes a plurality of sheet members 21, 22 stacked in the direction of the insert axis C between the cutting insert 3 and the insert mounting seat 4. Yes. In the present embodiment, two disk-shaped sheet members 21 and 22 are interposed between the cutting insert 3 and the insert mounting seat 4 in an overlapping manner.

Among these sheet members 21 and 22, the sheet member that contacts the insert mounting seat 4 from the insert axis C direction is the first sheet member 21, and the sheet that contacts the cutting insert 3 from the insert axis C direction. The member is a second sheet member 22.
In the present embodiment, the total number of the sheet members 21 and 22 is two, and thus the first and second sheet members 21 and 22 are also in contact with each other in the insert axis C direction.
Further, the first and second sheet members 21 and 22 are arranged on the insert mounting seat 4 with their respective central axes being coaxial with the insert axis C. In the present specification, the central axes of the sheet members 21 and 22 are also expressed by using the same symbol C as that of the insert axis C, and the central axes of the sheet members 21 and 22 may be referred to as the insert axis C in some cases. .

  As shown in FIGS. 10A and 10B, in the example of the present embodiment, the first and second sheet members 21 and 22 have the same shape, and specifically, are the same as each other. The outer diameter, the inner diameter, and the thickness are set. The sheet members 21 and 22 are formed with circular holes 21a and 22a penetrating the sheet members 21 and 22 in the insert axis C direction. A shaft portion 17a of a support shaft 17, which will be described later, is inserted into the circular holes 21a and 22a.

In FIG. 5, the first sheet member 21 that contacts the insert mounting seat 4 is formed of a material having a hardness higher than the hardness of the insert mounting seat 4. The second sheet member 22 includes the cutting insert 3 and other sheet members (in the present embodiment, the first sheet member 21) adjacent to both sides of the second sheet member 22 in the insert axis C direction. It is formed of a material having a lower hardness than the hardness or a material having an equivalent hardness (that is, a material having an equivalent or lower hardness).
Specifically, in this embodiment, the cutting insert 3 and the first sheet member 21 are made of cemented carbide, and the second sheet member 22 is made of a steel material such as SKD having a hardness lower than that of the cemented carbide. Is formed.
The second sheet member 22 may be formed of a material having a hardness higher than that of steel, and may be formed of a cemented carbide, for example.

The first sheet member 21 is provided so as not to rotate about the insert axis C with respect to the insert mounting seat 4, and the second sheet member 22 includes the cutting insert 3 and other sheet members (first sheet member). The sheet member 21) is provided to be rotatable around the insert axis C.
In the present embodiment, the first sheet member 21 is made non-rotatable with respect to the insert mounting seat 4 due to the frictional resistance between the first seat member 21 and the insert mounting seat 4, and is special for restricting rotation. No structure is provided. However, the present invention is not limited to this. For example, the first sheet member 21 is provided with a notch that is linear in a cross-sectional view on the outer periphery, and the first notch is brought into contact with the wall surface 4b. The first sheet member 21 may be made unrotatable with respect to the insert mounting seat 4 by a configuration that restricts the rotation of the sheet member 21.

Although not particularly illustrated, of the front and back surfaces 9 and 10 of the cutting insert 3, the back surface 10 contacting the second sheet member 22 and the front and back surfaces intersecting the insert axis C of the second sheet member 22 A lubricating coating is formed on at least one of the surfaces in contact with the cutting insert 3.
Of the front and back surfaces of the second sheet member 22, the back surface contacting the other sheet member (first sheet member 21), and the front and back surfaces intersecting the insert axis C of the other sheet member, A lubricating coating is formed on at least one of the surfaces in contact with the two sheet members 22.
Specifically, a lubricating coating is formed on at least one of the back surface 10 of the cutting insert 3 and the surface of the second sheet member 22 in contact with the back surface 10, and / or the second sheet member 22. A lubricating coating is formed on at least one of the back surface and the surface of the other sheet member (first sheet member 21) in contact with the back surface.
In the present embodiment, a lubricating coating is formed on the front and back surfaces (front surface and back surface) of the second sheet member 22 from the viewpoint of ease of manufacture and the like.

The lubricating coating is any one of a film made of a lubricant, a PVD film, and a plating film.
Specifically, in the present embodiment, the lubricating coating contains a film made of an epoxy-based or graphite-based paint-type lubricant, that is, an organic binder or an inorganic binder, and is applied to the coated surface and then heated. A dry film lubricant formed by curing or drying at room temperature is employed. An example of such a lubricant is Toray Dow Corning's product name: Moricoat (registered trademark). In this embodiment, the static friction coefficient of the lubricating coating is, for example, 5/100 or less.
In addition, when employ | adopting a PVD film | membrane as a lubricating film, a chromium system PVD film | membrane etc. can be used, for example. Moreover, when employ | adopting a plating film as a lubricating film, a hard chromium plating film etc. can be used, for example.

[Support shaft]
As shown in FIGS. 4, 5, 11, and 12 (a) and 12 (b), the cutting insert mounting mechanism 1 is mounted on the insert mounting seat 4 to rotate the cutting insert 3 about the insert axis C. A support shaft 17 is provided for free support.

The support shaft 17 is inserted into the through hole 14 of the cutting insert 3 and attached to the insert mounting seat 4. The support shaft 17 is connected to the shaft portion 17 a and has a larger diameter than the inner diameter of the through hole 14. It has a head portion 17b that is arranged with a gap between the front and back surfaces 9, 10 of the cutting insert 3 with the front surface 9 and that can contact the front surface 9.
Further, the support shaft 17 has a central axis coaxially arranged with the insert axis C, and is detachably mounted on the insert mounting seat 4. In the present specification, the center axis of the support shaft 17 is also expressed by using the same symbol C as that of the insert axis C, and the center axis of the support shaft 17 is sometimes referred to as the insert axis C.

  In FIG. 5, the shaft portion 17 a is inserted into the through hole 14 of the cutting insert 3 and the circular holes 21 a and 22 a of the first and second sheet members 21 and 22, and the cutting insert 3 and the plurality of sheet members 21. , 22 are slidably supported from the inner side in the insert radial direction, a cylindrical shaft body 17e, a male screw portion (screw portion) 17d screwed to the insert mounting seat 4, and a central axis of the shaft portion 17a ( And a locked portion 17c having a polygonal cross section perpendicular to the insert axis C).

In the example of this embodiment, in the shaft portion 17a, the shaft main body 17e, the locked portion 17c, and the male screw portion 17d are arranged in this order in a direction away from the head portion 17b in the insert axis C direction. The shaft body 17e, the locked portion 17c, and the male screw portion 17d have an outer diameter that decreases in this order.
In the shaft portion 17a, the positions of the locked portion 17c and the male screw portion 17d in the direction of the insert axis C may be interchanged. In this case, the outer diameter of the shaft body 17e, the male screw portion 17d, and the locked portion 17c is reduced in this order.

The shaft body 17e is formed to have the largest diameter in the shaft portion 17a and is disposed adjacent to the head portion 17b.
Further, as shown in FIG. 6, in the example of this embodiment, the locked portion 17 c has a regular hexagonal shape in a cross-sectional view perpendicular to the insert axis C. That is, the locked portion 17c is formed with a plurality of flat surfaces around the insert axis C, and in the example of this embodiment, six of these flat surfaces are provided.

  In addition, since the to-be-latched part 17c has comprised the some flat surface arranged along the insert circumferential direction while forming the polygonal shape by cross-sectional view, the cross section (cross-sectional view) mentioned above. The shape is not limited to a regular hexagonal shape, and may be formed in, for example, other quadrilateral cross sections, pentagonal cross sections, heptagonal cross sections, octagonal cross sections, and the like. In addition, as shown in FIG. 11, a convex curved surface portion having a circular arc shape in cross section may be formed between flat surfaces adjacent to each other in the insert circumferential direction in the locked portion 17 c.

  As shown in FIG. 5, the male screw portion 17 d is screwed to the female screw portion 4 d of the insert mounting seat 4. Further, the position of the support shaft 17 in the direction of the insert axis C relative to the insert mounting seat 4 can be adjusted by adjusting the screwing amount of the male screw portion 17d with respect to the female screw portion 4d.

  The head 17b is formed with a locking hole capable of locking a work tool such as a wrench. Further, in the example of the present embodiment, the head portion 17b is formed to have a gradually reduced diameter as the head portion 17b moves away from the shaft portion 17a in the central axis direction (insert axis C direction), and the outer peripheral surface of the head portion 17b is tapered. It has a shape.

As shown in FIG. 5, the support shaft 17 configured as described above is inserted into the cutting insert 3 and the first and second sheet members 21, 22 and mounted on the insert mounting seat 4. The head 17 b of the support shaft 17 is disposed with a predetermined gap (clearance) between the flat portion (head contact portion) 15 on the surface 9 of the cutting insert 3. In addition, it is preferable that the said clearance gap is set to the range of 0.01-0.6 mm, for example, More desirably, it sets to the range of 0.03-0.2 mm.
Further, the head portion 17b can contact the flat portion 15 of the surface 9 by adjusting the screwing amount of the male screw portion 17d with respect to the female screw portion 4d (by deeply screwing).

Further, at least the end portion on the shaft portion 17 a side in the insert axis C direction in the head portion 17 b is accommodated in the inner peripheral wall (head accommodating portion) 16 on the surface 9 of the cutting insert 3.
Further, the shaft body 17e of the shaft portion 17a connects the small diameter portion (shaft support portion) 14b in the through hole 14 of the cutting insert 3 and the circular holes 21a and 22a of the plurality of sheet members 21 and 22 in the insert radial direction. Support from the inside.
In the example shown in FIG. 5, the portion of the shaft body 17 e on the side of the locked portion 17 c on the shaft body 17 e is inserted so as to fit into the opening of the support shaft mounting hole 4 c in the insert mounting seat 4. In addition, the shaft portion 17a is supported from the outside in the insert radial direction by the opening.

(Locking part)
As shown in FIGS. 4 to 6, the cutting insert mounting mechanism 1 can be brought into contact with one of a plurality of flat surfaces formed around the insert axis C in the locked portion 17 c. As a locking portion for restricting the rotation of the support shaft 17 around the insert axis C relative to the insert mounting seat 4, a female screw 18 screwed into the screw hole 7 is provided.
In the present embodiment, the insert of the support shaft 17 with respect to the insert mounting seat 4 is achieved by restricting the rotation of the support shaft 17 in the insert circumferential direction by the tip of the female screw 18 coming into contact with the locked portion 17 c of the support shaft 17. The movement in the direction of the axis C can be restricted.

[Energizing means]
As shown in FIGS. 4 and 5, the cutting insert mounting mechanism 1 uses a compression coil spring (as a biasing means for biasing the cutting insert 3 in the insert axis C direction with respect to the second sheet member 22. Compression spring) 23. The compression coil spring 23 has a central axis that is coaxial with the insert axis C, and the insert axis C between the head 17 b of the support shaft 17 and the bottom surface of the large diameter portion 14 a in the through hole 14 of the cutting insert 3. It is interposed in an elastically deformed state so as to shrink in the direction.
The compression coil spring 23 is accommodated in the large diameter portion (biasing means accommodating portion) 14 a of the cutting insert 3.
In addition, as a biasing means, instead of using the compression coil spring 23, a disc spring (compression spring) may be used, or other plate springs may be used.

[Mounting posture of cutting insert on insert mounting seat]
As shown in FIG. 3, in the example of the present embodiment, in a state where the cutting insert 3 is mounted on the insert mounting seat 4, the insert axis C (not shown in FIG. 3) of the cutting insert 3 is the tool rotation. As it goes in the direction T, it gradually extends toward the tip end side of the tool. However, the present invention is not limited to this, and the insert axis C of the cutting insert 3 may be gradually inclined toward the outer side in the tool radial direction toward the tool rotation direction T, or the tool rotation direction T As it goes to, it may be inclined and extended toward the tool tip side and the outside in the tool radial direction.
Specifically, the direction in which the insert axis C of the cutting insert 3 is inclined can sufficiently suppress, for example, the force in the insert radial direction that acts on the support shaft 17 at the time of cutting, and the cutting insert 3 is further driven to rotate. It is set in consideration of things that can be easily made.

[Effects of this embodiment]
In the cutting insert mounting mechanism 1 of the present embodiment described above, the cutting insert 3 is cut into the work material by the cutting blade 5 during cutting, and the cutting insert 3 is inserted into the insert mounting seat by the force received from the work material at this time. 4 is driven to rotate around the insert axis C.
A plurality of sheet members 21 and 22 are interposed between the cutting insert 3 and the insert mounting seat 4, and the sheet members 21 and 22 are disposed adjacent to each other immediately above the insert mounting seat 4. While the first sheet member 21 is not rotatable with respect to the insert mounting seat 4, the second sheet member 22 disposed adjacently immediately below the cutting insert 3 is inserted into the insert axis along with the rotation of the cutting insert 3. Rotate around C (turn around).

  According to the present embodiment, since the rotation of the first seat member 21 with respect to the insert mounting seat 4 is restricted, the friction between the insert mounting seat 4 and the first seat member 21 is suppressed, which is a conventional problem. Uneven wear of the insert mounting seat 4 that has been performed can be prevented. Therefore, the tool body 2 on which the insert mounting seat 4 is formed can be used stably over a long period of time.

  The second sheet member 22 is rotatable with respect to the cutting insert 3 and the other sheet member (first sheet member 21) adjacent to both sides in the insert axis C direction, that is, the second sheet member 22 is rotated. Since the sheet member 22 is separated from the cutting insert 3 and the other sheet member 21, as described in the present embodiment, for example, the hardness of the second sheet member 22 is set to the cutting insert 3 and the other sheet. Compared with each hardness of the member 21, it can be made into the value below equivalent. Therefore, the second sheet member 22 can be preferentially worn by friction with the cutting insert 3 and other sheet members 21.

The wear of the second sheet member 22 progresses over the entire circumference around the insert axis C of the second sheet member 22 as the second sheet member 22 rotates. That is, since the second sheet member 22 is evenly worn around the insert axis C, uneven wear is unlikely to occur.
Thus, according to the present embodiment, uneven wear of the plurality of sheet members 21 and 22 and the insert mounting seat 4 can be suppressed, so that the seating stability of the cutting insert 3 can be maintained well.

  Furthermore, while the effect of preventing uneven wear is obtained as described above, the entire cutting insert mounting mechanism 1 can save space. That is, since this embodiment employs a simple configuration in which a plurality of sheet members 21 and 22 are interposed between the cutting insert 3 and the insert mounting seat 4, for example, an increased number of seat members than the conventional configuration. Depending on the number of sheets (thickness), or the thickness of the cutting insert 3 is reduced or the position of the insert mounting seat 4 is retracted so that the thickness becomes equal to or greater than this thickness, the entire mechanism 1 is made compact. It is easy to form. Therefore, it is easy to meet demands for various cutting modes.

As described above, according to the present embodiment, uneven wear of the sheet members 21 and 22 and the insert mounting seat 4 is suppressed, and the seating stability of the cutting insert 3 can be maintained satisfactorily. Processing can be performed stably.
Moreover, it is easy to form the whole cutting insert attachment mechanism 1 compactly, and space saving can be achieved.

  Moreover, in this embodiment, since the cutting insert 3 is provided with the urging means (compression coil spring 23) which urges | biases the cutting insert 3 with respect to the insert axis C direction with respect to the 2nd sheet | seat member 22, there exists the following effect.

That is, according to the above configuration, the urging means urges the cutting insert 3 toward the second sheet member 22, so that the cutting insert 3 is brought into close contact with the second sheet member 22 and rattling is suppressed. Thus, the seating stability of the cutting insert 3 at the time of cutting can be significantly improved.
Specifically, since the cutting insert 3 urged by the urging means is rotated only by the force received when it is cut into the work material, it is easy to give the expected amount of rotation for each cut and is stable. Rotation is easy to obtain.

That is, unlike the above-described configuration, in the cutting insert that is simply rotated and not biased by the biasing means, during cutting, centrifugal force other than the force that the cutting insert receives from the work material or other inertial force, Since various forces such as the force due to contact with chips and coolant act and the cutting insert is rotated irregularly, it is difficult to give the cutting insert the desired amount of rotation for each notch and stable rotation is achieved. It may be difficult to obtain.
On the other hand, according to the above-described configuration of the present embodiment, it is easy to stably impart the expected rotation to the cutting insert 3, and the entire cutting edge 5 of the cutting insert 3 contributes evenly (evenly) to the cutting process. Thus, a good cutting state can be stably maintained.

Moreover, in this embodiment, since the compression coil spring (compression spring) 23 is interposed as a biasing means between the head 17b of the support shaft 17 and the cutting insert 3, the biasing means is easily formed. The cutting insert mounting mechanism 1 can be easily manufactured and maintained.
In this embodiment, since the compression coil spring 23 is accommodated in the large diameter portion (biasing means accommodation portion) 14a of the through hole 14 of the cutting insert 3, the compression coil spring 23 is made of chips and coolant. The performance of the compression coil spring 23 can be stably and satisfactorily maintained by being hardly affected.
The same effect as described above can also be obtained when a disc spring or a leaf spring other than the compression coil spring 23 is used as the biasing means.

  Further, in the present embodiment, of the front and back surfaces 9 and 10 of the cutting insert 3, the back surface 10 that abuts on the second sheet member 22 and the front and back surfaces of the second sheet member 22 abuts on the cutting insert 3. Since the lubricating coating is formed on at least one of the surfaces, the following effects are obtained.

That is, according to the above configuration, the lubricant film is formed on one or both of the back surface 10 of the cutting insert 3 and the surface of the second sheet member 22 that contacts the back surface 10, that is, the cutting insert. 3 and the second sheet member 22, the lubricating coating is interposed between them, so that they can be stably slid and the cutting insert 3 and the second sheet member 22 are arranged around the insert axis C. Stable relative rotation.
In addition, when a lubricating film is formed in the back surface 10 of the cutting insert 3 which is a member rotated with the force received from a cut material, the partial wear of a film can be prevented and it is more preferable.

  In addition, among the front and back surfaces of the second sheet member 22, the back surface contacting the other sheet member (first sheet member 21) and the second sheet member 22 among the front and back surfaces of the other sheet members. Since the lubricating film is formed on at least one of the abutting surfaces, the following effects are obtained.

That is, according to the above configuration, the lubricant film is formed on one or both of the back surface of the second sheet member 22 and the surface of the other sheet member (first sheet member 21) that contacts the back surface. In other words, since the lubricating coating is interposed between the second sheet member 22 and the other sheet member, they can be slid easily and stably, and the second sheet member 22 and the other sheet member The sheet member is stably rotated relative to the insert axis C.
In addition, when a lubricating film is formed on the back surface of the second sheet member 22 that is a member rotated by the force received from the work material, it is more preferable because uneven wear of the film can be prevented.

Thus, a lubricating coating is provided between the cutting insert 3 and the second sheet member 22 or / and between the second sheet member 22 and the other sheet member (first sheet member 21). Thus, the cutting insert 3 and the second sheet member 22 are easily rotated stably by the force received from the work material during cutting, and the effect of suppressing the above-described uneven wear becomes more remarkable.
Furthermore, when a lubricant film is interposed between members adjacent to the insert axis C direction (the cutting insert 3, the sheet members 21, 22), these members that come into contact with each other through the lubricant film can easily slip. The wear of the member (particularly the second sheet member 22) can be remarkably suppressed.

More specifically, the following three modes are conceivable for the rotation state of the second sheet member 22 around the insert axis C.
1. A mode that rotates by frictional resistance with the cutting insert 3.
2. A mode in which rotation does not occur due to frictional resistance with other sheet members (first sheet member 21).
3. Above 1.2. A mode in which rotation is mixed (a mode in which rotation and rotation stop are repeated alternately).
And according to the said structure of this embodiment, when a lubricating film is provided, said 2. This mode can be surely avoided.
In the present embodiment, the cutting insert 3 is pressed against the second sheet member 22 by the biasing means (compression coil spring 23), so that the cutting insert 3 is cut into the work material only when the work material is cut. Is rotated by the force received from Accordingly, in the second sheet member 22 as well, the above-described 3. The rotation state close to the mode is given.
Specifically, at the time of cutting, the cutting insert 3 is rotated around the insert axis C by a dozen or so times per second, and the second sheet member 22 is rotated at a rotation speed that is about a half of that per second.

In the present embodiment, since the lubricating coating is formed of any one of a film made of a lubricant, a PVD film, and a plating film, high lubrication performance is generally required without requiring maintenance of the lubricating coating. Can be maintained stably.
Specifically, when the lubricating film is formed of a film made of a lubricant, the lubricating film can be easily produced, and various desired performances (friction resistance, rotational force, life, etc.) Can be stably provided. Further, when the lubricating coating is formed of a PVD film or a plating film, it is easy to control the thickness of the lubricating coating while obtaining the desired lubricating performance.

  In the present embodiment, the cutting insert 3 is driven to rotate relative to the insert mounting seat 4 while being supported from the inside in the insert radial direction by the shaft portion 17a of the support shaft 17 inserted into the through hole 14. And it is prevented by the head 17b of the support shaft 17 from coming off. Then, the clearance (clearance) between the head 17b of the support shaft 17 and the surface 9 of the cutting insert 3 is set to a desired value, and the support shaft 17 moves in the direction of the insert axis C relative to the insert mounting seat 4. Can be regulated.

  Accordingly, the cutting insert 3 can be stably rotated around the insert axis C by the support shaft 17. Further, the support shaft 17 can restrict the movement of the cutting insert 3 (and the plurality of sheet members 21 and 22) so as to be greatly separated from the insert mounting seat 4 in the insert axis C direction. Can be suppressed.

  Further, for example, when the second sheet member 22 is evenly worn in the circumferential direction around the insert axis C, and the thickness of the second sheet member 22 in the insert axis C direction is reduced, the cutting insert 3 and By moving the support shaft 17 in the direction of the insert axis C in accordance with the amount of decrease in the distance from the insert mounting seat 4, the position can be finely adjusted so that the desired gap (clearance) is obtained. . Further, after the fine adjustment, the position of the support shaft 17 can be fixed to maintain the desired gap.

Specifically, in this embodiment, the insert mounting seat 4 is adjusted by adjusting the degree (screwing amount) in which the male screw portion (screw portion) 17d formed on the shaft portion 17a of the support shaft 17 is screwed into the insert mounting seat 4. On the other hand, the support shaft 17 can be accurately moved in the central axis direction (insert axis C direction) of the shaft portion 17a, and fine adjustment of the position of the support shaft 17 is easy.
In addition, by inserting a female screw (locking portion) 18 into one flat surface of the locked portion 17c having a polygonal cross section formed in the shaft portion 17a of the support shaft 17, the insert mounting seat Thus, the rotation of the support shaft 17 with respect to 4 can be reliably restricted, and the movement of the support shaft 17 in the direction of the insert axis C can be restricted.

More specifically, the clearance (clearance) between the head 17b of the support shaft 17 and the surface 9 of the cutting insert 3 can be easily set to a desired value by the procedure described below.
That is, first, the male screw portion 17 d of the support shaft 17 is screwed into the female screw portion 4 d of the insert mounting seat 4 until the head portion 17 b of the support shaft 17 contacts the surface 9 of the cutting insert 3. When the head portion 17b of the support shaft 17 comes into contact with the surface 9 of the cutting insert 3, the female screw 18 is screwed into contact with the locked portion 17c of the support shaft 17.

At this time, the tip of the female screw 18 abuts on a portion other than a portion closest to the central axis (insert axis C) on the flat surface of the locked portion 17c (that is, a portion having the smallest diameter among the locked portions 17c). In this case, the support shaft 17 can be rotated around the insert axis C (the screwing of the insert mounting seat 4 into the female screw portion 4d can be loosened), so that the support shaft 17 is slightly moved to the screw loosening side. Rotate to
In addition, it is preferable that the angle (rotation angle around the insert axis C) for rotating the support shaft 17 at this time is equal to or less than one outer angle of a polygon appearing in the section of the locked portion 17c. Specifically, when the locked portion 17c has a regular hexagonal cross section as in the present embodiment, the rotation angle is 60 ° or less. For example, when the locked portion 17c has a regular octagonal cross section, the rotation angle is 45 ° or less.

  Then, the female screw 18 is screwed in again, and the tip of the female screw 18 is brought into contact with the locked portion 17c. By repeating this operation, the female screw 18 comes into contact with the flat surface of the locked portion 17c from the front (that is, comes into contact with the portion having the smallest diameter of the flat surface). And the movement of the support shaft 17 in the central axis direction (insert axis C direction) is also restricted.

In addition, as a result, a predetermined gap (between the screw pitch of the male screw portion 17d of the support shaft 17 and the rotation angle between the head portion 17b of the support shaft 17 and the flat portion 15 of the surface 9 of the cutting insert 3 ( Clearance) is formed. Specifically, in the present embodiment, for example, when the thread pitch (lead) of the male screw portion 17d of the support shaft 17 is 0.5 mm toward the central axis per circumference around the central axis (insert axis C), the support shaft When the head 17 b of the 17 is in contact with the surface 9 of the cutting insert 3 and the support shaft 17 is rotated to the loose side of the screw within a range of 60 ° or less and fixed with the screw screw 18, 0.5 mm From x60 ° / 360 ° = 0.0833 mm, the gap (clearance) of 0.0833 mm or less can be accurately set.
In addition, for example, when the locked portion 17c has a regular octagonal cross section and the support shaft 17 is rotated to the loose side of the screw within a range of 45 ° or less and fixed with the set screw 18, 0.5 mm × 45 From the angle of /360°=0.0625 mm, the gap (clearance) of 0.0625 mm or less can be set with high accuracy.

Further, when the tip of the grommet screw 18 abuts from the front on the flat surface of the locked portion 17c from the front (contacts the smallest diameter portion of the flat surface), the abutment of the support shaft 17 is caused by this abutment. Since further rotation is restricted, the tip of the grommet screw 18 is once retracted from the flat surface, and then the support shaft 17 is slightly rotated to the loose side of the screw, and the procedure is performed in the same manner as described above. .
As described above, according to the above-described configuration, alignment of the support shaft 17 in the central axis direction (insert axis C direction) can be performed accurately and easily without requiring skill of the operator. A gap (clearance) between the head 17b and the surface 9 of the cutting insert 3 can be set with high accuracy.

In the present embodiment, at least a portion of the head 17 b of the support shaft 17 located on the surface 9 side of the cutting insert 3 is accommodated in an inner peripheral wall (head accommodating portion) 16 on the surface 9. In addition, the exposed portion of the head portion 17b that is not accommodated in the inner peripheral wall 16 is formed with a gradually reduced diameter as the distance from the surface 9 in the direction of the insert axis C is increased.
Accordingly, it is possible to prevent chips flowing on the surface 9 of the cutting insert 3 from strongly hitting the head portion 17b of the support shaft 17 to increase cutting resistance or wear the head portion 17b.

In the present embodiment, since the first sheet member 21 is formed of a cemented carbide, it is possible to significantly prevent the first sheet member 21 from being worn.
Moreover, since the 2nd sheet | seat member 22 is formed with steel materials or a cemented carbide, there exists the following effect.

That is, when the 2nd sheet member 22 is formed with steel materials, manufacture of this 2nd sheet member 22 is easy and manufacturing cost can be reduced. In this case, even when a large force (such as a high load in the direction of the insert axis C) is applied to the second sheet member 22 during cutting, the second sheet member 22 is less likely to be damaged due to toughness. In addition, when forming the 2nd sheet | seat member 22 with steel materials, it is preferable to use a high hardness thing among steel materials, such as SKD, for example.
In addition, when the second sheet member 22 is formed of a cemented carbide, not only the uneven wear of the second sheet member 22 but also the wear itself is remarkably suppressed, thereby extending the tool life. Can do.

  Further, the second sheet member 22 is lower than each hardness of the cutting insert 3 and the other sheet members (first sheet member 21) adjacent to both sides of the second sheet member 22 in the insert axis C direction. The book described above that when formed of a material having hardness, the second sheet member 22 can be preferentially worn by friction with the cutting insert 3 and other sheet members to suppress uneven wear. The effect of embodiment is achieved more reliably.

Further, in the present embodiment, the above-described cutting insert mounting mechanism 1 is formed, for example, in a cylindrical shape or a disk shape on the outer periphery of the tip of the tool body 2 that can be rotated around the tool axis O. A plurality of blades are arranged at intervals in the direction, and are employed in the cutting edge rotating milling tool 30. In other words, the cutting edge rotating milling tool 30 is configured such that the tool body 2 is rotated about the tool axis O and the workpiece is machined.
Since the cutting edge rotating milling tool 30 includes the above-described cutting insert mounting mechanism 1, it is possible to stably perform highly accurate cutting (milling).

Although not particularly illustrated, the cutting insert attachment mechanism 1 may be disposed at the tip of a tool body having an axial shape, for example, and employed in a cutting edge rotating turning tool. In this case, the cutting edge rotating turning tool includes the above-described cutting insert mounting mechanism 1 and the tool main body on which the insert mounting seat 4 is formed, so that the rotating workpiece is turned (turning). Composed.
This cutting edge rotating type turning tool is inserted by the force that the cutting blade 5 receives when the cutting insert 3 cuts into the work material (the cutting force or cutting resistance includes the cutting edge force or edge force component). This is a rotary turning tool in which the cutting insert 3 is driven (passively) around the insert axis C with respect to the mounting seat 4.
Since this cutting edge turning tool is provided with the above-described cutting insert mounting mechanism 1, it is possible to stably perform highly accurate turning.

[Other configurations included in the present invention]
The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

For example, in the above-described embodiment, two sheet members 21 and 22 are provided as the plurality of sheet members 21 and 22 that are interposed between the cutting insert 3 and the insert mounting seat 4 and overlap in the direction of the insert axis C. However, the number of sheet members is not limited to the above two.
That is, another sheet member is provided between the first sheet member 21 that contacts the mounting surface 4 a of the insert mounting seat 4 and the second sheet member 22 that contacts the back surface 10 of the cutting insert 3. Alternatively, a plurality of sheets may be provided in the direction of the insert axis C. In this case, the other sheet members sandwiched between the first and second sheet members 21 and 22 may rotate around the insert axis C or may not rotate.
Further, in this case, the second sheet member 22 is rotatable around the insert axis C with respect to the other sheet member disposed immediately below the second sheet member 22 (on the side opposite to the cutting insert 3 in the insert axis C direction). Provided. Preferably, the second sheet member 22 is formed of a material having a hardness lower than or equal to the hardness of the other sheet member.

Further, the urging means only needs to have a configuration for urging the cutting insert 3 in the direction of the insert axis C with respect to the second sheet member 22, and therefore the urging means is the compression coil spring 23 described above. It may be an elastically deformable member or mechanism other than a disc spring or a leaf spring.
Furthermore, the biasing means may not be provided.

In the above-described embodiment, the cutting insert 3 is a negative insert whose outer peripheral surface 11 is formed parallel to the insert axis C, but is not limited thereto.
That is, the cutting insert 3 is a negative insert having a shape different from the above, in which the outer peripheral surface 11 is formed so as to gradually increase in diameter from the cutting edge 5 toward the back surface 10 side in the insert axis C direction. There may be. Alternatively, the cutting insert 3 may be a positive insert formed such that the outer peripheral surface 11 gradually decreases in diameter from the cutting edge 5 toward the back surface 10 side from the front surface 9 in the insert axis C direction.

Moreover, each material of the tool main body 2 in which the cutting insert 3, the plurality of sheet members 21 and 22, and the insert mounting seat 4 are formed is not limited to that described in the above-described embodiment.
Moreover, you may use a screw member other than the grub screw 18, a pin member, etc. as a latching | locking part.

What is shown in FIGS. 13 to 17 is a modification of the cutting insert attachment mechanism 1 described in the above-described embodiment. Detailed description of the same components as those of the above-described embodiment will be omitted, and only differences will be described below.
This modification differs from the above-described embodiment mainly in the configuration of the support shaft 17, the support shaft mounting hole 4 c, and the female screw (locking portion) 18.

As shown in FIGS. 13 to 16, of the shaft portion 17 a and the head portion 17 b of the support shaft 17, the shaft portion 17 a is a male screw located at the tip of the shaft portion 17 a in the direction of the central axis (insert axis C). A shaft body 17e that is positioned between the portion 17d, the male screw portion 17d, and the head portion 17b and has a larger diameter than the male screw portion 17d, and is formed between the male screw portion 17d and the shaft main body 17e. A contact step portion 17f.
The contact step portion 17f is located between and connected to the male screw portion 17d and the shaft main body 17e. In the illustrated example, the tip end side (the male screw portion 17d side) of the shaft portion 17a in the central axis direction. It has a circular ring shape facing A locked portion 17g having a smaller diameter than other portions (portions other than the tip portion) is formed at the tip end portion (lower end portion) in the central axis direction of the outer peripheral surface of the shaft body 17e. . As shown in FIG. 14, the locked portion 17 g has a circular cross section.

In FIG. 13, the insert mounting seat 4 has a support shaft mounting hole 4c in which the support shaft 17 is mounted. The support shaft mounting hole 4c is formed with a female screw portion 4d into which the male screw portion 17d of the support shaft 17 is screwed, and an insertion hole portion 4e formed with a larger diameter than the female screw portion 4d and through which the shaft main body 17e is inserted. And an abutted stepped portion 4f formed between the female screw portion 4d and the insertion hole portion 4e and abutted against the abutting stepped portion 17f.
The contacted step portion 4f is located between the female screw portion 4d and the insertion hole portion 4e and is connected to each other. In the example shown in the drawing, the opening portion side (in the central axis direction of the support shaft mounting hole 4c ( A circular ring shape facing the head 17b side of the support shaft 17 is formed.

  As shown in FIGS. 13 and 14, a female screw (locking portion) 18 screwed into the screw hole 7 of the tool body 2 protrudes into the insertion hole portion 4e of the support shaft mounting hole 4c and is supported. The shaft 17 can be brought into contact with the locked portion 17g of the shaft main body 17e. When the female screw 18 contacts the shaft body 17e, the rotation of the shaft portion 17a around the central axis with respect to the support shaft mounting hole 4c is restricted.

In the example shown in FIG. 14, the center axis of the support shaft 17 (the center axis of the support shaft mounting hole 4c, the insert axis C) is positioned on the extension line of the center axis of the grommet screw 18 (center axis of the screw hole 7). That is, the center axis of the female screw 18 and the central axis of the support shaft 17 intersect each other, and the tip surface of the female screw 18 is in contact with the shaft main body 17e of the support shaft 17.
However, the present invention is not limited to this, and as in the example shown in FIG. 17, the center axis (support shaft mounting hole 4 c) of the support shaft 17 is on the extension line of the center axis of the grommet screw 18 (center axis of the screw hole 7). The center axis of the insert screw C is not located, that is, the center axis of the set screw 18 and the center axis of the support shaft 17 are not crossed, and the set screw 18 is A tapered surface 18a provided at the tip may be contacted.

13 to 17, the male screw portion 17d of the shaft portion 17a of the support shaft 17 is screwed into the female screw portion 4d of the support shaft mounting hole 4c of the insert mounting seat 4, so that the support shaft The support shaft 17 is stably erected on the insert mounting seat 4 by abutting the contact step portion 17f of the shaft portion 17a against the contact step portion 4f of the mounting hole 4c. That is, since the position of the shaft portion 17a in the center axis direction with respect to the support shaft mounting hole 4c is stably suppressed, the axial force of the shaft portion 17a can be increased, and the cutting insert 3 can be increased by the shaft portion 17a. Can be stably supported.
Then, by bringing a grub screw (locking portion) 18 into contact with the shaft main body 17e of the shaft portion 17a, the rotation of the shaft portion 17a around the central axis with respect to the support shaft mounting hole 4c is restricted, and the insert mounting seat 4 The rotation of the support shaft 17 with respect to the movement of the support shaft 17 can be restricted, and the movement of the support shaft 17 in the direction of the insert axis C can be restricted.

  In the above modification, the male screw portion 17d of the shaft portion 17a is screwed into the female screw portion 4d of the support shaft mounting hole 4c, and the contact step portion 17f is abutted against the contacted step portion 4f. Thus, the head portion 17 b of the support shaft 17 is disposed with a predetermined gap (clearance) between the head portion 17 b of the support shaft 17 and the flat portion 15 on the surface 9 of the cutting insert 3. Accordingly, an operation for adjusting the position of the support shaft 17 in the direction of the insert axis C with respect to the insert mounting seat 4 becomes unnecessary, and the operability is good.

  In addition, in the range which does not deviate from the meaning of this invention, you may combine each structure (component) demonstrated by the above-mentioned embodiment, a modification, and a remark etc., addition of a structure, omission, substitution, others It can be changed. Further, the present invention is not limited by the above-described embodiments, and is limited only by the scope of the claims.

DESCRIPTION OF SYMBOLS 1 Cutting insert attachment mechanism 2 Tool body 3 Cutting insert 4 Insert mounting seat 4c Support shaft mounting hole 4d Female thread part 4e Insertion hole part 4f Contacted step part 5 Cutting edge 9 Surface 10 Back surface 14 Through-hole 17 Support shaft 17a Shaft Part 17b Head part 17c Locked part 17d Male thread part (screw part)
17e Shaft body 17f Abutting step 18 Female screw (locking part)
21 First sheet member (other sheet member)
22 Second sheet member 23 Compression coil spring (biasing means)
30 Cutting edge rotating milling tool C Insert axis O Tool axis

Claims (13)

A cutting insert having a disc-like shape and having a circular cutting edge extending around the insert axis;
An insert mounting seat on which the cutting insert is rotatably mounted about the insert axis, and a cutting insert mounting mechanism comprising:
Between the cutting insert and the insert mounting seat, a plurality of sheet members are interposed in the insert axial direction,
Among the plurality of sheet members,
The first seat member that contacts the insert mounting seat is provided so as not to rotate around the insert axis with respect to the insert mounting seat.
The second sheet member in contact with the cutting insert is provided to be rotatable about the insert axis with respect to the cutting insert and other sheet members adjacent to both sides of the second sheet member in the insert axial direction. A cutting insert mounting mechanism characterized by that. The cutting insert mounting mechanism according to claim 1,
A cutting insert mounting mechanism comprising biasing means for biasing the cutting insert in the insert axial direction with respect to the second sheet member. A cutting insert mounting mechanism according to claim 1 or 2,
The cutting insert has a through hole that extends on the insert axis and opens on the front and back surfaces that intersect the insert axis of the cutting insert,
A support shaft that is mounted on the insert mounting seat and rotatably supports the cutting insert around the insert axis;
The support shaft is
A shaft portion that is inserted into the through hole and attached to the insert mounting seat;
A head portion connected to the shaft portion, having a diameter larger than the inner diameter of the through hole, and having a head disposed with a gap between the front and back surfaces of the cutting insert,
A cutting insert mounting mechanism characterized in that movement of the support shaft relative to the insert mounting seat in the insert axial direction can be restricted. A cutting insert mounting mechanism according to claim 3,
The position of the support shaft relative to the insert mounting seat in the insert axial direction can be adjusted,
The head can be brought into contact with the surface of the cutting insert;
The shaft portion is
A screw portion screwed to the insert mounting seat;
A locked portion having a polygonal cross section perpendicular to the central axis of the shaft portion,
The locking portion can be brought into contact with one of a plurality of flat surfaces formed around the central axis, and restricts rotation of the support shaft around the central axis relative to the insert mounting seat. A cutting insert mounting mechanism comprising a locking portion. A cutting insert mounting mechanism according to claim 3,
The shaft portion is
A male screw portion located at the tip of the shaft portion;
A shaft main body located between the male screw portion and the head, and having a larger diameter than the male screw portion,
A contact step portion formed between the male screw portion and the shaft body,
The insert mounting seat has a support shaft mounting hole to which the support shaft is mounted,
The support shaft mounting hole is
A female screw portion to which the male screw portion is screwed;
An insertion hole portion formed to have a larger diameter than the female screw portion, and through which the shaft body is inserted;
A contacted step portion that is formed between the female screw portion and the insertion hole portion and is in contact with the contact step portion;
An attachment mechanism for a cutting insert, characterized in that the cutting insert attachment mechanism includes a locking portion that is capable of contacting the shaft main body and restricts rotation of the shaft portion around a central axis with respect to the support shaft mounting hole. It is the attachment mechanism of the cutting insert as described in any one of Claims 3-5,
A compression spring is interposed between the head of the support shaft and the cutting insert as an urging means for urging the cutting insert in the insert axial direction with respect to the second sheet member. A cutting insert mounting mechanism characterized by the above. It is the attachment mechanism of the cutting insert as described in any one of Claims 1-6,
The second sheet member is formed of a material having a hardness lower than each hardness of the cutting insert and the other sheet members adjacent to both sides of the second sheet member in the insert axial direction. A cutting insert mounting mechanism characterized by It is the attachment mechanism of the cutting insert as described in any one of Claims 1-7,
The first sheet member is formed of a cemented carbide,
The mounting mechanism for a cutting insert, wherein the second sheet member is made of steel. A cutting insert mounting mechanism according to any one of claims 1 to 8,
Of the front and back surfaces intersecting the insert axis of the cutting insert, the back surface contacting the second sheet member, and the front and back surfaces intersecting the insert axis of the second sheet member, the cutting insert A cutting insert mounting mechanism, wherein a lubricating coating is formed on at least one of the abutting surfaces. It is the attachment mechanism of the cutting insert as described in any one of Claims 1-9,
Of the front and back surfaces intersecting the insert axis of the second sheet member, the second of the back surfaces contacting the other sheet member and the front and back surfaces intersecting the insert axis of the other sheet member. A cutting insert mounting mechanism, characterized in that a lubricating coating is formed on at least one of the surfaces that contact the sheet member. A cutting insert mounting mechanism according to claim 9 or 10,
The cutting insert mounting mechanism, wherein the lubricating coating is any one of a film made of a lubricant, a PVD film, and a plating film. The cutting insert mounting mechanism according to any one of claims 1 to 11,
And a tool body on which the insert mounting seat is formed. The cutting insert mounting mechanism according to any one of claims 1 to 11,
A tool tip rotating turning tool comprising: a tool main body on which the insert mounting seat is formed.

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