JP2008119787A - Rotating tool holder and rotating tool having the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotating tool holder which is improved in working efficiency by preventing degradation in a service life of the holder by forming a bottom surface of an insert mount to open in the axial direction and inhibiting occurrence of a crack at an axial base end on the bottom surface of the insert mount. <P>SOLUTION: The insert mount has a mounting seat face 131, a mounting side face 132, and an intersecting groove 133 formed to exhibit a curved surface for the mounting seat face and the mounting side face at their intersection. The mounting seat face is connected with a connecting face extending in the rotation direction from the mounting seat face at an axial tip and is opened in the axial direction at an axial base end. The intersecting groove has a radius of the groove deeper than the maximum groove depth of the intersecting groove, and in addition, is formed such that the maximum groove depth of the intersecting groove increases from the axial tip toward the base end. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rolling tool holder constituting a cutting tool, and more particularly to a rolling tool holder in which a plurality of cutting inserts are mounted in the axial direction of a holder, such as a helical end mill.

  Conventionally, as a cutting tool for processing a metal material, a throw-away type cutting tool that is used by detachably attaching a cutting insert to a holder is frequently used. In such a cutting tool, there is a problem in that stress is likely to occur at the portion where the bottom surface and the side wall of the insert mounting portion formed on the holder body intersect at the time of cutting, and cracks are likely to occur.

Therefore, in Patent Document 1, a notch groove extending inward of the holder body along the intersection is formed at the intersection between the bottom surface and the side wall of the insert mounting portion, and the depth of the notch groove from the bottom surface is increased. A holder is disclosed in which the depth from the side wall and the depth from the side wall gradually decrease along the intersecting portion toward the inside of the holder body. With such a configuration, it is possible to relieve stress generated in the intersecting portion, and increase the amount of back metal behind the intersecting portion of the chip mounting seat due to the notch groove.
Japanese Utility Model Publication No. 05-070820

  However, unlike the holder described in Patent Document 1, the holder for a cutting tool to which a plurality of cutting inserts are mounted so as to be continuous in the axial direction that is frequently used in accordance with the recent high efficiency of cutting processing is different from the insert mounting portion. Is formed so as to open in the axial direction on the axial base end side without crossing the mounting side surface on the axial base end side. When the notch groove described in Patent Document 1 is adopted in the holder formed so that the bottom surface of the insert mounting portion opens in the axial direction on the axial base end side, a large stress is applied on the axial base end side. Nevertheless, since the depth of the notch groove is reduced, there is a problem that stress concentration is insufficiently relaxed and cracks are likely to occur on the proximal side in the axial direction of the intersection.

  The occurrence of such cracks on the base end side in the axial direction of the intersecting portion reduces the holder life, so the holder must be frequently replaced, and cutting is performed by continuously providing the cutting insert in the axial direction. As a result, there has been a problem that the work efficiency is lowered.

  Therefore, an object of the present invention is a rolling tool holder formed so that the bottom surface of the insert mounting portion is opened in the axial direction in order to increase the efficiency of cutting by providing cutting inserts continuously in the axial direction. An object of the present invention is to provide a rolling tool holder that suppresses the occurrence of cracks on the base end side in the axial direction of the bottom surface of the insert mounting portion, prevents a decrease in the life of the holder, and improves work efficiency.

The rolling tool holder in the present invention is formed on the distal end side of the main body having a rotating shaft and an outer peripheral surface, and includes an insert mounting portion to which a cutting insert is mounted,
The insert mounting portion includes a mounting seat surface that is formed to intersect the outer peripheral surface, a mounting side surface that is formed to intersect on the radially inner side of the mounting seat surface, the mounting seat surface, and the mounting side surface. And an intersection groove portion formed so as to form a concave curved surface shape along the axial direction and with respect to the mounting seat surface and the mounting side surface,
The mounting seat surface is connected to a connecting surface extending in the rotation direction with respect to the mounting seat surface on the distal end side in the axial direction, and is open in the axial direction on the proximal end side in the axial direction.
The intersecting groove portion is formed such that the radius of the intersecting groove portion is larger than the maximum groove depth of the intersecting groove portion, and the maximum groove depth of the intersecting groove portion increases from the distal end side in the axial direction toward the proximal end side. It is a feature.

  With such a configuration, the maximum groove depth of the intersecting groove portion is smaller on the distal end side in the axial direction held by the connecting surface extending in the rotational direction, and the mounting seat surface is opened in the axial direction. Therefore, the generation of cracks on the axial base end side can be suppressed. As a result, it is possible to suppress the decrease in the holder life and improve the working efficiency.

  Furthermore, in the above invention, the intersecting groove portion is formed so that the radius of the intersecting groove portion is substantially constant from the distal end side in the axial direction to the proximal end side. It is desirable because the thickness can be secured to improve the holder strength and the processing time of the holder can be shortened.

  Further, in the above invention, the crossing groove portion is formed so as to be connected to a spherical recess formed with a radius larger than the radius of the crossing groove portion on the axial base end side. This is desirable because the stress concentration in the layer can be further reduced.

  Furthermore, in the above invention, the axially distal end portion of the intersecting groove portion is located closer to the axially proximal end side than the axially distal end portion of the mounting seat surface. This is desirable because the strength of the holder can be further improved, the processing time of the cross groove portion can be reduced, and the cost of the holder can be reduced.

Further, in the above invention, on the tip end side in the axial direction of the main body portion, a tip mounting seat surface formed intersecting the outer peripheral surface, a tip mounting side surface formed intersecting the tip mounting seat surface, A crossing portion between the front end mounting seat surface and the front end mounting side surface has a front end crossing groove portion formed so as to form a concave curved surface along the axial direction with respect to the front end mounting seat surface and the front end mounting side surface. The formed tip insert mounting part is formed so as to intersect with the main body part tip surface,
The distal end mounting seat surface is opened in the axial direction on the distal end side and the proximal end side in the axial direction,
The distal intersection groove portion has a radius of the distal intersection groove portion larger than the maximum groove depth of the distal intersection groove portion, and the radius and the maximum groove depth of the distal intersection groove portion from the distal end side to the proximal end side in the axial direction. The fact that it is formed to be substantially constant reduces the stress concentration of the tip crossing groove that is opened in the axial direction on both the axial front end side and the axial base end side so that cracks are generated throughout the entire groove. It is desirable because it can be suppressed.

  Moreover, in the said invention, it was arrange | positioned in the axial direction base end side with respect to the said tip mounting side surface, and it had the convex part formed by protruding to a radial direction outer side. This is desirable because the cutting insert to be arranged can be mounted with high accuracy and stability, and the blade runout of the cutting insert can be reduced and excellent machining accuracy can be exhibited.

  Further, in the above invention, the main body portion is formed in a plurality of the distal end insert mounting portions in the rotation direction, and each of the main body portions spirals from the plurality of distal end insert mounting portions toward the proximal side in the axial direction. It is desirable that the plurality of insert mounting portions be formed because a plurality of cutting inserts can be continuously arranged in the axial direction, stress concentration can be reduced, and high efficiency of cutting can be achieved. .

  Still further, a rolling tool according to the present invention includes the rolling tool holder according to the present invention, and a cutting insert mounted on each of the insert mounting portion and / or the tip insert mounting portion. .

  With such a configuration, it is possible to improve the life of the holder, and it is possible to provide a turning tool capable of cutting with high accuracy and high efficiency.

  According to the rolling tool holder of the present invention, the radius of the intersecting groove portion is larger than the maximum groove depth of the intersecting groove portion, and the maximum groove depth of the intersecting groove portion is the connecting surface in which the mounting seat surface extends in the rotation direction. Is formed so as to be smaller on the distal end side in the axial direction and held on the proximal end side in the axial direction in which the mounting seat surface is opened in the axial direction. Since the concentration can be relaxed and the occurrence of cracks can be suppressed, the holder life can be prevented from being lowered and the working efficiency can be improved.

  FIG. 1 is an overall perspective view showing a rolling tool holder 1 (hereinafter abbreviated as holder 1) according to a first embodiment of the present invention, and FIG. 2 is a main portion of the holder 1 shown in FIG. FIG. 3 is an enlarged perspective view, and FIG. 3 is a sectional view taken along line XX of FIG. FIG. 4 is an overall perspective view of a rolling tool 3 according to an embodiment of the present invention in which a plurality of cutting inserts 2 (hereinafter abbreviated as “inserts 2”) are mounted on the holder 1. Further, FIG. 5 is an enlarged perspective view of a main part of a rolling tool holder 1 'according to the second embodiment of the present invention.

  Hereinafter, the holder 1 which is 1st Embodiment is demonstrated in detail using FIG. 1 thru | or FIG.

  The holder 1 according to the first embodiment of the present invention shown in FIGS. 1 to 3 is formed on the distal end side of the main body 11 having the rotation axis L and the outer peripheral surface, and the insert 2 is mounted. An insert mounting portion 13 is provided. In addition, as shown in FIG. 1, the holder 1 of the present embodiment has a plurality of insert mounting portions 13 formed in a spiral shape along the axial direction. The inserts 2 are respectively mounted on the plurality of insert mounting portions 13. The holder 1 of the present embodiment has four inserts 2 mounted in the rotational direction, and five inserts 2 mounted in a spiral shape in the axial direction. Therefore, a total of 20 inserts 2 can be attached to the holder 1 of this embodiment.

  The insert mounting portion 13 includes a mounting seat surface 131 formed so as to intersect the outer peripheral surface, a mounting side surface 132 formed so as to intersect on the radially inner side of the mounting seat surface 131, and the mounting seat surface 131. An intersecting groove 133 is formed at the intersection with the side surface 132 so as to form a concave curved surface along the axial direction and with respect to the mounting seat surface 131 and the mounting side surface 132. The mounting seat surface 131 is formed with a screw hole for screwing the insert 2 in a substantially central portion. The insert 2 is screwed and mounted on the holder 1 with the seating surface of the insert 2 in contact with the mounting seat surface 131.

  The mounting seat surface 131 is connected to a connecting surface 134 that extends in the rotational direction with respect to the mounting seat surface 131 on the distal end side in the axial direction, and is opened in the axial direction on the proximal end side in the axial direction. That is, the mounting seat surface 131 intersects the mounting side surface 132 on the radially inward side and the connection surface 134 on the tip end side in the axial direction, and the mounting side surface 132 and the connection surface 134 stand up in the rotational direction. And formed to stretch. On the other hand, the rear end side in the axial direction and the outer side in the radial direction have an open shape.

  In the intersecting groove portion 133 of the present invention, the radius R of the intersecting groove portion is larger than the maximum depth D of the intersecting groove portion, and the maximum depth D of the intersecting groove portion 133 increases from the distal end side in the axial direction toward the proximal end side. It is formed to do. That is, the intersecting groove portion 133 of the present invention is formed such that the maximum depth D of the intersecting groove portion 133 is maximized on the axial direction proximal end side of the intersecting groove portion 133.

  In such a configuration, that is, the maximum depth D of the intersecting groove portion is smaller on the tip end side in the axial direction held by the connection surface 134 in which the mounting seat surface 131 extends in the rotation direction, and the mounting seat surface 131 is opened in the axial direction. The stress concentration on the axial base end side can be mitigated by adopting a configuration that becomes larger on the axial base end side. Therefore, the generation of cracks on the axial base end side can be effectively suppressed, and the holder can be prevented from being damaged starting from the cracks. As a result, the working efficiency can be improved, and the cutting efficiency can be increased.

  Furthermore, the cross groove portion 133 of the present invention is formed so that the radius R of the cross groove portion 133 is larger than the maximum depth D of the cross groove portion 133, that is, the cross groove portion 133 is formed such that R ≧ D. Stress concentration can be effectively reduced while securing the thickness.

  Here, the radius R and the maximum depth D of the cross groove portion in the present invention will be described in detail below using the radius R and the maximum groove depth D of the cross groove portion 133 of the holder 1 of the present embodiment shown in FIG. explain.

As shown in FIG. 3, the crossing groove 133 is formed so as to have a part of an arc having a radius R in a cross-sectional shape in a plane perpendicular to the mounting seat surface 131 and the mounting side surface 132. This radius R is the radius R of the intersecting groove 133. In the holder 1 shown in FIG. 3, the crossing groove part 133 which the said cross-sectional shape consists of a part of circular arc of radius R is illustrated. Further, as shown in FIG. 3, the maximum groove depth D of the intersecting groove portion 133 is a mounting seat surface groove depth D ₁₃₁ which is the maximum groove depth on the mounting seat surface side and a maximum groove depth on the mounting side surface side. It is a larger value in the mounting side groove depth _D132 . Here, the mounting seat surface groove depth D ₁₃₁ is a dimension in a direction perpendicular to the mounting seat surface 131 and is the longest distance from the virtual extension surface of the mounting seat surface 131 to the intersecting groove portion 133. Similarly, the mounting side groove depth D ₁₃₂ is a dimension in a direction perpendicular to the mounting side 132 and is the longest distance between the virtual extension surface of the mounting side 132 and the intersecting groove 133. At this time, as described above, the radius: R and the maximum groove depth D: D of the intersecting groove part 133 are preferably formed so that R ≧ D. That is, in the cross-sectional shape, as shown in FIG. 3, the center O of the circular arc having the radius is located outside the intersecting groove portion 133. In other words, the crossing groove part 133 is formed such that the cross-sectional shape of the crossing groove part 133 is a portion of three quarters or less of an arc having a radius R. In particular, the formation of the cross groove 133 so that the cross-sectional shape of the cross groove 133 is substantially less than or equal to half of the arc of radius R is effective in both reducing stress concentration and improving holder strength. It is desirable because it can function. Note that the radius R and the maximum groove depth D of the intersecting grooves 133 can be measured in the cross section as shown in FIG.

  Further, the crossing groove portion 133 is symmetrical with respect to the bisector of the angle formed by the mounting seat surface 131 and the mounting side surface 132 through the center O on the base end side in the axial direction. It is preferable to be formed. Thereby, relaxation of stress concentration can be exhibited in a well-balanced manner, and generation of cracks in the connection surface 134 can be suppressed in addition to the mounting seat surface 131 and the mounting side surface 132.

  Further, it is desirable that the intersecting groove portion 133 is formed so that the radius R of the intersecting groove portion is substantially constant from the distal end side in the axial direction to the proximal end side. With such a configuration, the stress concentration on the proximal end side in the axial direction can be relaxed, the holder thick portion on the distal end side in the axial direction can be secured, and the holder strength can be improved. Holder processing. As a result, the processing time of the cross groove part 133 of the holder can be shortened.

  Furthermore, as shown in FIG. 2, the axially distal end portion s of the crossing groove portion 133 is positioned closer to the axially proximal end side than the axially distal end portion t of the mounting seat surface 131. desirable. With such a configuration, the strength of the holder on the tip end side in the axial direction can be improved, and the processing time of the intersecting groove portion 133 can be further reduced. As a result, it is possible to provide the holder 1 having a long holder life and low processing cost.

Still further, a tip mounting seat surface 131A formed intersecting the outer peripheral surface on the tip end side in the axial direction of the main body 11, a tip mounting side surface 132A formed intersecting the tip mounting seat surface 131A, and tip mounting At the intersection between the seating surface 131A and the tip mounting side surface 132A, there is a tip crossing groove portion 133A formed so as to form a concave curved surface along the axial direction and with respect to the tip mounting seating surface 131A and the tip mounting side surface 132A. The distal end insert mounting portion 13A is formed so as to intersect the main body portion distal end surface 14, and the distal end mounting seat surface 131A is opened in the axial direction on the distal end side and the proximal end side in the axial direction, 133A is desirably formed so that the radius R _A and the maximum groove depth D _{A of} the tip intersecting groove portion 133A are substantially constant from the tip end side to the base end side in the axial direction. With such a configuration, in the tip crossing groove 133A that is opened in the axial direction on both the axial front end side and the axial base end side, stress concentration is mitigated at both axial ends of the tip crossing groove portion 133A that is likely to crack. Can be achieved. Therefore, generation | occurrence | production of the crack in 133 A of front-end | tip crossing groove parts can be suppressed, the holder damage | wound starting from this crack can be suppressed, and a holder lifetime can be improved further. In addition, like the above-mentioned crossing groove part 133, since it can process using a single end mill, the processing time of crossing groove part 133A can be shortened.

Incidentally, 1313 tip intersecting groove 3A is similarly cross groove 133, the tip cross groove 133A of radius: _{R A} and the maximum groove depth: _{D A} are also formed so as to be _{R A} ≧ _{D A.}

  Further, it is desirable to have a convex portion 135A that is disposed on the proximal end side in the axial direction with respect to the distal end mounting side surface 131A and that protrudes radially outward. With such a configuration, the insert that is disposed closest to the distal end in the axial direction, that is, the insert 2A that is mounted on the distal end insert mounting portion 13A can be mounted on the holder with high accuracy and stability. Thereby, the blade run-out of the insert of the insert 2A mounted on the tip-side insert mounting portion 13A, that is, the tip blade run-out can be reduced, and excellent machining accuracy can be exhibited.

  Furthermore, the main body 11 includes a plurality of distal end insert mounting portions 13A formed in the rotation direction, and a plurality of spiral inserts starting from the plurality of distal end insert mounting portions 13A toward the proximal side in the axial direction. It is desirable that the insert mounting portion 13A is formed. With such a configuration, it is possible to continuously arrange the plurality of inserts 2 in the axial direction while relaxing stress concentration, and it is possible to increase the efficiency of cutting.

  In addition, when the insert mounting part 13 is continuously arranged on the holder in this manner, the insert mounting parts 13 adjacent to each other in the axial direction are partly shown in FIGS. 1 and 2, respectively. It is preferably formed to connect. Thus, by integrally forming the insert mounting portions 13 adjacent to each other in the axial direction, chips generated during the cutting process are smoothly discharged outward in the radial direction of the holder 1. Therefore, clogging of chips can be suppressed, damage to the holder 1 and the insert 2 due to chips can be prevented, and further improvement of the holder life can be achieved.

  Next, the rolling tool 3 which is one Embodiment of this invention is demonstrated using FIG. The rolling tool of the present invention is formed by mounting a cutting insert on the insert mounting portion of the holder of the present invention described above. A rolling tool 3 according to an embodiment of the present invention shown in FIG. 4 is formed by mounting a plurality of inserts 2 on a holder 1 in both an axial direction and a rotational direction. That is, the rolling tool 3 has a configuration of a helical end mill in which a plurality of inserts 2 are spirally arranged and mounted on the holder 1. Therefore, among the plurality of insert mounting portions 13 arranged along the axial direction, the insert mounting portion 13A located closest to the distal end side in the axial direction is arranged closest to the front side in the rotational direction. And several insert mounting parts 13 are arrange | positioned sequentially in the rotation direction back toward the axial direction base end side, and the insert 2 is mounted | worn with each.

  Thus, since the rolling tool of this invention can suppress generation | occurrence | production of the crack in the holder 1 by setting it as the structure using the holder for rolling tools mentioned above, it cuts on severer cutting conditions. Processing becomes possible. As a result, it is possible to provide a turning tool that enables highly efficient cutting.

  Next, a second embodiment according to the present invention will be described with reference to FIG. In addition, in the holder 1 'of the second embodiment, the same reference numerals as those of the holder 1 are assigned to the substantially same configurations as those of the holder 1 of the first embodiment described above, and the description thereof is omitted.

  The holder 1 ′ according to the second embodiment of the present invention shown in FIG. 5 has a spherical recess 136 formed such that the intersecting groove 133 has a radius larger than the radius R of the intersecting groove 133 on the proximal side in the axial direction. It is formed so as to be connected to. With such a configuration, since the shape opens in the axial direction, stress concentration can be further alleviated particularly on the proximal side in the axial direction where cracks due to stress concentration tend to occur. As a result, the occurrence of cracks on the axial base end side can be further suppressed. In addition, as shown in FIG. 5, by forming the spherical recess 136 to be substantially spherical, a balance can be achieved at any of the intersecting portions of the mounting seat surface 131, the mounting side surface 132, and the connection surface 134 that intersect with the spherical recess 136. Stress concentration can be relaxed well. Therefore, generation of cracks can be effectively suppressed at the intersection of the connection surface 134 in addition to the mounting seat surface 131 and the mounting side surface 132.

  As shown in FIG. 5, the cross groove portion 133 ′ of the holder 1 ′ of the second embodiment has an axial front end side end s of the cross groove portion 133 and an axial front end side end t of the mounting seat surface. The crossing groove part arrange | positioned in the substantially same position in the axial direction was illustrated. Such a configuration is more suitable for cutting conditions that require more relaxation of stress concentration.

  The present embodiment as described above is merely an example of the invention, and the configuration can be changed within the scope of the invention. For example, as a turning tool, only a helical end mill in which a plurality of inserts 2 are mounted in both the rotating direction and the axial direction of the holder has been described. However, the present invention is not limited to this, and the same applies to other turning tools. The effect of can be obtained. That is, it may be a rolling tool in which one insert 2 is mounted in the rotation direction of the holder and a plurality of inserts 2 are mounted only in the axial direction.

  Further, in both the holders 1 and 1 ′ of the first and second embodiments, the intersecting groove portion 133 is configured so that the maximum groove depth D of the intersecting groove portion 133 gradually increases from the distal end side in the axial direction toward the proximal end side. However, the present invention is not limited to this, and the cross groove portion 133 may be such that the maximum groove depth D of the cross groove portion is constant in a part of the cross groove portion 133. Even in such a cross groove portion 133, the maximum groove depth D of the cross groove portion 133 at the axial base end side end portion of the cross groove portion 133 is the maximum groove depth D of the cross groove portion 133 at the end portion in the axial direction distal end side. Since it is formed larger, it is possible to suppress the occurrence of cracks on the base end side in the axial direction, suppress holder damage starting from the cracks, and improve the life of the holder.

  Furthermore, in FIG. 4, the cutting tool formed by mounting the insert 2 having a substantially parallelogram plate shape is illustrated, but as another embodiment of the present invention, a substantially square shape corresponding to the shape of the holder 1 is illustrated. It goes without saying that the same effect can be obtained even if the insert 2 is formed in a substantially polygonal plate shape such as a plate shape and a substantially rhomboid plate shape. Furthermore, an R type insert can be used for the insert attached to the tip insert attaching portion.

  Further, in FIGS. 1 to 5, the embodiment in which the mounting side surface 132 of the insert mounting portion 13 formed in the holder 1 is one surface is illustrated, but the present invention is not limited to this, and the mounting side surface 132 may be as described above. Depending on the shape of the various inserts 2, it may be configured with a plurality of surfaces. In such a case, it is only necessary to form an intersecting groove portion having the shape of the present invention at least at the intersecting portion between the mounting side surface 132 and the mounting seat surface 131 located on the most proximal side in the axial direction. With such a configuration, stress concentration can be mitigated and the occurrence of cracks can be suppressed, and the life of the holder can be improved.

  As mentioned above, although embodiment of this invention was illustrated, this invention is not limited to embodiment, It cannot be overemphasized that it can be made arbitrary, unless it deviates from the objective of invention.

1 is an overall perspective view showing a rolling tool holder 1 according to a first embodiment of the present invention. It is a principal part expansion perspective view of the holder 1 for a rolling tool. It is XX cross-sectional enlarged view of FIG. 1 is an overall perspective view of a rolling tool 3 according to an embodiment of the present invention in which a plurality of cutting inserts 2 are mounted on a rolling tool holder 1. FIG. It is a principal part expansion perspective view of the holder 1 'for rolling tools which is 2nd embodiment of this invention.

Explanation of symbols

1 Holder for a rolling tool 11 Body

DESCRIPTION OF SYMBOLS 13 Insert mounting part 131 Mounting seat surface 132 Mounting side surface 133 Crossing groove part 134 Connection surface 136 Spherical recessed part

13A Tip insert mounting portion 131A Tip mounting seat surface 132A Tip mounting side surface 135A Convex portion

14 Main body tip

2 Insert 3 Turning tool

R: radius of intersection groove D: maximum groove depth of intersection groove

Claims (8)

It is formed on the distal end side of the main body portion having a rotation shaft and an outer peripheral surface, and includes an insert mounting portion to which a cutting insert is mounted,
The insert mounting portion includes a mounting seat surface formed to intersect the outer peripheral surface, a mounting side surface formed to intersect a radially inner side of the mounting seat surface, the mounting seat surface, and the mounting side surface. And an intersection groove portion formed so as to form a concave curved surface shape along the axial direction and with respect to the mounting seat surface and the mounting side surface,
The mounting seat surface is connected to a connecting surface extending in the rotation direction with respect to the mounting seat surface on the distal end side in the axial direction, and is open in the axial direction on the proximal end side in the axial direction.
The intersecting groove portion is formed by turning so that the radius of the intersecting groove portion is larger than the maximum groove depth of the intersecting groove portion, and the maximum groove depth of the intersecting groove portion increases from the distal end side in the axial direction toward the proximal end side. Tool holder.   The rolling tool holder according to claim 1, wherein the intersecting groove portion is formed so that a radius of the intersecting groove portion is substantially constant from a distal end side to a proximal end side in the axial direction.   3. The rolling tool holder according to claim 1, wherein the intersecting groove portion is formed so as to be connected to a spherical recess formed with a radius larger than the radius of the intersecting groove portion on the proximal side in the axial direction.   The holder for a rolling tool according to any one of claims 1 to 3, wherein an end portion on the distal end side in the axial direction of the intersecting groove portion is positioned closer to an proximal end side in the axial direction than an end portion on the distal end side in the axial direction of the mounting seat surface. . A front end mounting seat surface formed to intersect the outer peripheral surface on the front end side in the axial direction of the main body, a front end mounting side surface formed to intersect the front end mounting seat surface, the front end mounting seat surface, and the A tip insert mounting portion having a tip crossing groove portion formed so as to form a concave curved surface shape along the axial direction and with respect to the tip mounting seat surface and the tip mounting side surface at an intersection with the tip mounting side surface. And formed to intersect the front end surface of the main body,
The distal end mounting seat surface is opened in the axial direction on the distal end side and the proximal end side in the axial direction,
The distal intersection groove portion has a radius of the distal intersection groove portion larger than the maximum groove depth of the distal intersection groove portion, and the radius and the maximum groove depth of the distal intersection groove portion from the distal end side to the proximal end side in the axial direction. The holder for a rolling tool according to any one of claims 1 to 4, which is formed to be substantially constant.   The rolling tool holder according to claim 5, wherein the holder is provided on the proximal end side in the axial direction with respect to the distal end mounting side surface, and has a convex portion formed to project outward in the radial direction.   The main body portion includes a plurality of the tip insert mounting portions formed in the rotation direction, and each of the plurality of insert mounting portions spirally toward the proximal side in the axial direction, starting from the plurality of tip insert mounting portions. The holder for a rolling tool according to claim 5 or 6, wherein is formed. A holder for a rolling tool according to any one of claims 1 to 7,
A cutting tool comprising: a cutting insert mounted on each of the insert mounting portion and / or the tip insert mounting portion.

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