JP2015037814A - Rotary cutting tool for tooth cutting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary cutting tool which can fix cutter blades firmly in a double-surface restricted state in a slot and allows easy adjustment of the radial-direction position of the cutter blades.SOLUTION: The rotary cutting tool includes a cutter attachment jig 1 formed with a plurality of slots 12 in the outer peripheral surface, a plurality of cutter blades 2 and 3 arranged by being inserted into the individual slots, a clamp ring 4, and a plurality of adjustment means 30 for adjusting the arrangement position of the cutter blade in the radial direction in each slot. The individual adjustment means consists of a wedge member 31 arranged between the inner wall surface 12c of the slot and the cutter blades, and an adjustment screw 34. The wedge member is formed in a right-angle trapezoidal shape, in the view from the axial direction of the cutter attachment jig, so that the outer surface 31b coming in contact with the cutter blade forms an inclined side, in order to cause the outer surface of the wedge member to intersect a second side wall surface of the slot at an acute angle. Rear surfaces 2b and 3b and inner side surfaces 2c and 3c of the individual cutter blades are formed so as to come in contact with the second side wall surface of the individual slots and the outer surface of the wedge member.

Description

  The present invention relates to a gear cutting rotary cutting tool for gear cutting such as a spiral bevel gear or a hypoid bevel gear.

  Conventionally, as this type of rotary cutting tool for gear cutting, for example, as disclosed in Patent Document 1, a cutter mounting jig in which a plurality of slots are formed at predetermined intervals on the outer peripheral surface, and this cutter mounting jig Provided with a plurality of cutter blades inserted into the respective slots and a clamp ring mounted on the outer peripheral surface of the cutter mounting jig so as to surround the plurality of cutter blades. It is known that the outer side surface of the cutter blade is pressed and fixed at the tip of a fastening screw extending into each slot through a screw hole.

  The slot is orthogonal to the first side wall surface on the front side in the rotational direction and the second side wall surface on the rear side in the rotational direction, which are opposed to each other in parallel with a predetermined interval, and the back side between the both side wall surfaces. However, as previously described in Patent Document 1, the present applicant has improved the shape of the slot and the shape of the cutter blade to improve the gear cutting. Proposals have been made to improve the cutting accuracy by reliably preventing the cutter blade from shifting in the slot during cutting.

  That is, in this proposal, the inner wall surface of the slot is provided so as to intersect the second side wall surface at an acute angle, and the rear surface and the inner side surface of the cutter blade are in contact with the second side wall surface and the inner wall surface of the slot. When the cutter blade is inserted and disposed in the slot of the cutter mounting jig and fixed to the inner wall surface of the slot by the fastening screw, the cutter blade is moved to the second side along the inner wall surface of the slot. It moves to the wall surface side, and not only the inner side surface thereof contacts the inner wall surface of the slot, but also the rear surface is fixed in a two-surface constrained state in contact with the second side wall surface of the slot. For this reason, even if a load is applied in the rotational direction of the rotary cutting tool during gear cutting, the cutter blade does not shift in the slot, and the cutting accuracy can be improved.

  By the way, in the conventional rotary cutting tool for gear cutting described above, when the cutter blade is inserted into the slot of the cutter mounting jig and fixed with the fastening screw after re-blading to polish the cutting edge of the cutter blade, re-blading is performed. Since it is difficult to uniformly apply to all cutter blades, it is required that the arrangement position of the cutter blade in each slot can be easily adjusted in the radial direction of the cutter mounting jig.

  On the other hand, as a means for responding to such a request, for example, as disclosed in Patent Document 2, in a front milling cutter that fixes a cutter with a screw in a cutter storage groove of a cutter head, the radial position of the cutter is set. Adjustment means for making adjustments are known. The adjusting means includes a parallel plate disposed in the cutter housing groove of the cutter head, a wedge member disposed between the parallel plate and the inner wall surface of the groove, and a thickness of the wedge member changing in an axial direction of the cutter head. And an adjusting screw screwed into a screw hole provided in the cutter head so as to face the inner wall surface of the groove, and the wedge member is turned into the parallel plate and the groove by turning the adjusting screw. The position of the cutter in the radial direction is adjusted by sliding in the axial direction of the cutter head with the wall surface.

JP 2006-61997 A Japanese Patent No. 2657115 (page 4-7, FIGS. 1 and 2)

  However, when the conventionally known adjusting means is applied as it is to a rotary cutting tool for gear cutting, in particular, the one in which the cutter blade is fixed in the slot in the two-surface constrained state previously proposed by the present applicant, The wedge member or the parallel plate of the adjusting means may impede the two-surface constrained state of the cutter blade, so that its function may not be fully exhibited.

  The present invention has been made in view of such various points, and the object of the present invention is to appropriately apply a conventionally known adjusting means to a cutter blade that is fixed in a two-surface constrained state in a slot. By improving the cutter blade, it is possible to firmly fix the cutter blade in the slot in a two-surface constrained state, and to provide a rotary cutting tool for gear cutting that can easily adjust the radial position of the cutter blade. .

  In order to solve the above-mentioned problem, the invention according to claim 1 is a cutter cutting jig in which a plurality of slots are formed on the outer peripheral surface at predetermined intervals, as a rotary cutting tool for gear cutting, and the cutter mounting jig. Screws provided on the clamp ring, each having a plurality of cutter blades inserted and arranged in each slot, and a clamp ring mounted on the outer peripheral surface of the cutter mounting jig so as to surround the plurality of cutter blades It is assumed that the outer side surface of the cutter blade is pressed and fixed at the tip of a fastening screw extending through the hole and into each slot. The slots are orthogonal to the first side wall surface on the front side in the rotational direction and the second side wall surface on the rear side in the rotational direction, which are parallel to each other with a predetermined distance therebetween, on the back side between the both side wall surfaces. A plurality of units for adjusting the arrangement position of the cutter blade in each slot in the radial direction in a temporarily fixed state in which the fixing of the cutter blade by pressing the fastening screw is slightly loosened, while having a configuration having an inner wall surface positioned Adjusting means, and a wedge member disposed between the inner wall surface of the slot and the cutter blade, the thickness of which changes in the axial direction of the cutter mounting jig, and the inner wall surface of the slot of the wedge member. An adjustment screw that is partially fitted in a recess provided on the inner surface and is screwed into a screw hole provided on the cutter mounting jig so as to face the inner wall surface of the slot. Further, the wedge member is formed in a right trapezoidal shape in which the outer surface in contact with the cutter blade when viewed in the axial direction of the cutter mounting jig is an inclined side, and the outer surface of the wedge member is in relation to the second side wall surface of the slot. While making it cross | intersect at an acute angle, it is set as the structure formed so that the rear surface of each said cutter blade may contact the 2nd side wall surface of a slot, and the inner side surface of each cutter blade may contact the outer surface of the said wedge member, respectively.

  In this configuration, when the cutter blade inserted and disposed in each slot of the cutter mounting jig is pressed and fixed to the back side in the slot with the tip of the fastening screw extending into each slot through the screw hole provided in the clamp ring. The wedge member of the adjusting means disposed between the cutter blade and the inner wall surface of the slot is formed in a right trapezoidal shape with the outer surface being an inclined side when viewed in the axial direction of the cutter mounting jig, and the outer surface of the wedge member Is formed so as to intersect the second side wall surface of the slot at an acute angle, so that the inner side surface of the cutter blade not only contacts the inner wall surface of the slot via the wedge member, but the cutter blade also has an outer surface of the wedge member. Are moved to the second side wall surface side of the slot, and firmly fixed in a two-surface constrained state in which the rear surface of the cutter blade is in contact with the second side wall surface of the slot.

  Also, when adjusting the arrangement position of the cutter blade in each slot in the slot radial direction, after fixing the cutter blade by pressing the fastening screw to a temporarily loosened state, the adjustment screw of the corresponding adjusting means is used. By rotating and sliding the wedge member between the cutter blade and the slot inner wall surface in the axial direction of the cutter mounting jig, the arrangement position of the cutter blade can be adjusted in the slot radial direction. At this time, especially when adjusting the arrangement position of the cutter blade to the outside in the slot radial direction, the cutter blade and the wedge member are displaced by receiving the reaction force in the opposite direction from the mutual contact surface. When the blade is fixed in a two-surface constrained state, the fixing can be performed more reliably and firmly.

  As described above, according to the rotary cutting tool for gear cutting according to the present invention, the wedge member of the adjusting means disposed between the cutter blade and the inner wall surface of the slot has the outer surface inclined when viewed in the axial direction of the cutter mounting jig. Since the outer surface of the wedge member intersects the second side wall surface of the slot at an acute angle, the cutter blade is firmly held in the slot in a two-surface constrained state. Can be fixed. As a result, even when a load is applied in the rotational direction of the rotary cutting tool during gear cutting, it is possible to reliably prevent the cutter blade from shifting in the slot and to improve the cutting accuracy.

  Also, turn the adjustment screw of the adjustment means in the temporarily fixed state where the cutter blade is slightly loosened by pressing the fastening screw, and slide the rust member in the axial direction of the cutter mounting jig between the cutter blade and the inner wall surface of the slot. As a result, the arrangement position of the cutter blade can be adjusted in the slot radial direction, so that the usability can be improved. In addition, when adjusting the position of the cutter blade to move outward in the radial direction of the slot, the cutter blade and the wedge member are displaced by receiving the reaction force in the opposite direction from the mutual contact surface. When fixed in a two-surface constrained state, there is an effect that the fixing can be performed more reliably and firmly.

FIG. 1 is a front view of a part of a rotary cutting tool for gear cutting according to an embodiment of the present invention. FIG. 2 is a side view in which the left half of the rotary cutting tool is cut off from the center line. FIG. 3 is an enlarged view of the vicinity of X in FIG. 4 is a cross-sectional view taken along line YY of FIG. FIG. 5 is an arrow view seen from the Z direction of FIG. 6A and 6B show the wedge member of the adjusting means, where FIG. 6A is a front view, FIG. 6B is a right side view, FIG. 6C is an upper end view, and FIG.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments that are modes for carrying out the present invention will be described with reference to the drawings.

  1 and 2 show the overall configuration of a rotary cutting tool A for gear cutting according to an embodiment of the present invention. The rotary cutting tool A includes a cutter mounting jig 1 also called a cutter head, and a plurality of cutter blades 2 and 3 provided on the outer peripheral portion of the cutter mounting jig 1 at predetermined intervals in the circumferential direction. A clamp ring 4 mounted on the outer peripheral surface of the cutter mounting jig 1 is provided so as to surround the plurality of cutter blades 2 and 3. In FIG. 2, most of the plurality of cutter blades 2 and 3 are omitted for reasons of drawing creation.

  The cutter mounting jig 1 has a disk shape having a bore 11 as a mounting hole in the center, and the outer peripheral surface is formed in a stepped shape having a diameter on the front side larger than that on the rear side. A clamp ring 4 is mounted on the outer peripheral surface on the front side. Further, a plurality of slots 12, 12,... Extending in the axial direction between the front surface and the rear surface are formed on the outer peripheral surface of the cutter mounting jig 1 at predetermined intervals in the circumferential direction. The blades 2 and 3 are respectively inserted into the slots 12 and arranged.

  In the clamp ring 4, a plurality of screw holes 13, 13,... Penetrating in the radial direction are provided at predetermined intervals in the circumferential direction corresponding to the slots 12, 12,. ing. Then, a fastening screw 14 is screwed into each screw hole 13 from the outside of the clamp ring 4, and the tip of the fastening screw 14 extends into the slot 12 and is pressed against the outer side surfaces of the cutter blades 2 and 3. The blades 2 and 3 are fixed in the slot 12.

  As shown in FIGS. 3 to 5 in an enlarged manner, each of the slots 12 includes a first side wall surface 12a on the front side in the rotation direction R and a second side wall surface on the rear side in the rotation direction R, which are parallel to each other at a predetermined interval. 12b and inner wall surfaces 12c positioned orthogonally to these two side wall surfaces 12a and 12b. The both side wall surfaces 12a and 12b extend in a direction toward the substantially center when viewed in the axial direction of the cutter mounting jig 1, and are perpendicular to the side of the cutter mounting jig 1 (that is, the axis of the cutter mounting jig 1). Direction) to be slightly inclined (about 2 to 15 degrees) in front of the rotation direction R. Further, the inner wall surface 12c is on the front side (upper surface side in FIG. 4) of the cutter mounting jig 1 along the axial direction of the cutter mounting jig 1 because of the relationship with the wedge member 31 of the adjusting means 30 described later. It is formed to be slightly inclined (about 2 to 6 degrees) toward the center of the cutter mounting jig 1 as it goes.

  As the cutter blades 2 and 3, two types of inner blades and outer blades, that is, the inner blade cutter blade 2 and the outer blade cutter blade 3 are used. These two types of cutter blades 2 and 3 are alternately inserted and arranged in two adjacent slots 12 and 12 of the cutter mounting jig 1 to form one set, and the workpiece material is processed by the one set of cutter blades 2 and 3. One gear groove is cut.

  Each of the cutter blades 2 and 3 is made of a rod-shaped material (high-speed tool steel, superalloy, cermet, ceramic, or the like) having a substantially rectangular cross section. As shown in detail in FIG. 3, a rake face 21 is formed on the front face 2a of the inner cutter blade 2 so as to incline toward the outer side face 2d from a portion near the inner side face 2c over the entire length in the axial direction. On the other hand, on the front surface 3a of the outer cutter blade 3, there is formed a rake face 22 that is inclined from the portion near the outer side surface 3d toward the inner side surface 3c. Further, cutting edges 23 and 24 are formed at one end portions of the cutter blades 2 and 3, respectively.

  In the rotary cutting tool A, the positions of the cutter blades 2 and 3 in the slots 12 are set in the radial direction in a temporarily fixed state where the fixing of the cutter blades 2 and 3 by pressing the fastening screws 14 is slightly loosened. A plurality of adjusting means 30, 30,... For adjusting are provided. Each of the adjusting means 30 is disposed between the inner wall surface 12c of the slot 12 and the cutter blades 2 and 3, as shown in enlarged detail in FIGS. 3 and 4, and the thickness changes in the axial direction of the cutter mounting jig 1. The wedge member 31 and a screw hole 33 provided in the cutter mounting jig 1 so as to face the slot inner wall surface 12c and partly fit into the recess 32 provided on the inner surface 31a contacting the inner wall surface 12c of the slot. The adjustment screw 34 is screwed in.

  As shown in detail in FIG. 6, the wedge member 31 is formed in a right trapezoidal shape in which the outer surface 31b contacting the cutter blades 2 and 3 when viewed in the longitudinal direction, that is, the axial direction of the cutter mounting jig 1, is an inclined side. Therefore, the outer surface 31b of the wedge member 31 is formed on the second side wall surface of the slot 12 when the wedge member 31 is disposed between the slot inner wall surface 12c and the cutter blades 2 and 3, as shown in FIG. It intersects with 12b at an acute angle. The acute angle is preferably in the range of 40 to 80 degrees. In addition, the wedge member 31 is formed to be inclined in the longitudinal direction at a predetermined angle corresponding to the inclination of the slot 12 (specifically, both side wall surfaces 12a and 12b) viewed from the side of the cutter mounting jig 1. In addition, the thickness of the wedge member 31 is such that the thickness t1 of the upper end of the wedge member is smaller than the thickness t2 of the lower end of the wedge member in accordance with the inclination of the inner wall surface 12c of the slot 12 with respect to the axial direction of the cut mounting jig 1 ( t1> t2). The concave portion 32 is provided in a groove shape extending in the horizontal direction at a portion near the upper end of the inner surface 31 a of the wedge member 31.

  On the other hand, inclined surfaces 25 and 26 are formed on the inner side surfaces 2c and 3c of the cutter blades 2 and 3, respectively, corresponding to the outer surface 31b of the wedge member 31. When the cutter blades 2 and 3 are inserted and arranged in the slots 12 and the outer side surfaces 2d and 3d of the cutter blades 2 and 3 are pressed and fixed with the tips of the fastening screws 14, the rear surfaces 2b of the cutter blades 2 and 3 are fixed. , 3b are in contact with the second side wall surface 12b of the slot 12, and the inclined surfaces 25, 26 of the inner side surfaces 2c, 3c of the cutter blades 2, 3 are in contact with the outer surface 31b of the wedge member 31, respectively.

  Next, in order to explain the function and effect of the rotary cutting tool A for gear cutting, the cutter blades 2 and 3 inserted in the slots 12 of the cutter mounting jig 1 are passed through the screw holes 13 provided in the clamp ring 4. When the distal end of the fastening screw 14 extending into each slot 12 is pressed against the inner side of the slot and fixed, the wedge member 31 of the adjusting means 30 disposed between the cutter blades 2 and 3 and the slot inner wall surface 12c includes: The outer surface 31b is formed in a right trapezoidal shape having an inclined side when viewed in the axial direction of the cutter mounting jig 1, and the outer surface 31b of the wedge member 31 intersects the second side wall surface 12b of the slot 12 at an acute angle. Therefore, not only the inner side surfaces 2c and 3c of the cutter blades 2 and 3 are in contact with the inner wall surface 12c of the slot 12 via the wedge member 31, but also the cutter blade The blades 2 and 3 move along the outer surface 31b of the wedge member 31 toward the second side wall surface 12b of the slot 12, and the rear surfaces 2b and 3b of the cutter blades 2 and 3 are in contact with the second side wall surface 12b of the slot 12. It is firmly fixed in a surface constrained state. As a result, even when a load is applied in the rotational direction R of the rotary cutting tool A during gear cutting, it is possible to reliably prevent the cutter blades 2 and 3 from shifting in the slot 12 and to improve cutting accuracy. Can do.

  Further, when adjusting the arrangement position of the cutter blades 2 and 3 in each slot 12 in the radial direction of the slot, after fixing the cutter blades 2 and 3 by pressing the fastening screws 14 in a temporarily loosened state, By rotating the adjusting screw 34 of the corresponding adjusting means 30 and sliding the wedge member 31 between the cutter blades 2 and 3 and the slot inner wall surface 12c in the axial direction of the cutter mounting jig 1, the cutter blades 2 and 3 The arrangement position can be adjusted in the slot radial direction. At this time, particularly when the arrangement position of the cutter blades 2 and 3 is moved and adjusted outward in the slot radial direction, the cutter blades 2 and 3 and the wedge member 31 contact each other (inclined surfaces 25 and 26 of the cutter blades 2 and 3). Alternatively, since the displacement is received in response to the reaction force in the opposite direction from the outer surface 31b) of the wedge member 31, when the cutter blades 2 and 3 are fixed in the two-surface constrained state by the fastening screw 14 after adjustment, the fixing is more surely and firmly. It can be carried out.

  In addition, this invention is not limited to the said embodiment, A various other form is included. For example, in the above embodiment, the rotary cutting tool A for gear cutting is a type in which one set of two cutter blades 2 and 3, that is, the inner cutter blade 2 and the outer cutter blade 3 cut one gear groove in the workpiece. In addition to this type, the present invention is a type in which one gear groove is cut in a workpiece with one set of three cutter blades, only one outer cutter blade or only one inner cutter blade. The present invention can be similarly applied to a rotary cutting tool for gear cutting such as a set of types.

  Moreover, in the said embodiment, when the 1st side wall surface 12a and the 2nd side wall surface 12b of each slot 12 formed in the outer peripheral surface of the cutter attachment jig | tool 1 are seen in the axial direction of the cutter attachment jig | tool 1, it is the approximate center. Has been described so as to be slightly inclined from the vertical direction to the front side in the rotational direction R when viewed from the side of the cutter mounting jig 1, but the present invention is not limited thereto, When the first side wall surface 12 a and the second side wall surface 12 b of the slot 12 are viewed in the axial direction of the cutter mounting jig 1, the rotation direction R is more than the center of the cutter mounting jig 1 as it goes from the entrance side to the back side of the slot 12. The present invention can be similarly applied to a member that is inclined to the rear side and that extends in the vertical direction when viewed from the side of the cutter mounting jig 1.

A Rotating cutting tool for gear cutting R Rotating direction 1 Cutter mounting jig 2, 3 Cutter blade 2a, 3a Front surface 2b, 3b Rear surface 2c, 3c Inner side surface 2d, 3d Outer side surface 4 Clamp ring 12 Slot 12a First side wall surface 12b First 2 Side wall surface 12c Inner wall surface 13 Screw hole 14 Fastening screw 25, 26 Inclined surface 30 Adjustment means 31 Wedge member 31a Inner surface 31b Outer surface 32 Recessed portion 33 Screw hole 34 Adjusting screw

In order to solve the above-mentioned problem, the invention according to claim 1 is a cutter cutting jig in which a plurality of slots are formed on the outer peripheral surface at predetermined intervals, as a rotary cutting tool for gear cutting, and the cutter mounting jig. Screws provided on the clamp ring, each having a plurality of cutter blades inserted and arranged in each slot, and a clamp ring mounted on the outer peripheral surface of the cutter mounting jig so as to surround the plurality of cutter blades It is assumed that the outer side surface of the cutter blade is pressed and fixed at the tip of a fastening screw extending through the hole and into each slot. The slots are orthogonal to the first side wall surface on the front side in the rotational direction and the second side wall surface on the rear side in the rotational direction, which are parallel to each other with a predetermined distance therebetween, on the back side between the both side wall surfaces. A plurality of units for adjusting the arrangement position of the cutter blade in each slot in the radial direction in a temporarily fixed state in which the fixing of the cutter blade by pressing the fastening screw is slightly loosened, while having a configuration having an inner wall surface positioned Adjusting means, and a wedge member disposed between the inner wall surface of the slot and the cutter blade, the thickness of which changes in the axial direction of the cutter mounting jig, and the inner wall surface of the slot of the wedge member. An adjustment screw that is partially fitted in a recess provided on the inner surface and is screwed into a screw hole provided on the cutter mounting jig so as to face the inner wall surface of the slot. Further, the wedge member is formed in a right trapezoidal shape in which the outer surface in contact with the cutter blade when viewed in the axial direction of the cutter mounting jig is an inclined side, and the outer surface of the wedge member is in relation to the second side wall surface of the slot. While making it cross | intersect at an acute angle, it is set as the structure which forms the back surface of each said cutter blade in contact with the 2nd side wall surface of a slot, and the inner side surface of each cutter blade directly touches the outer surface of the said wedge member, respectively.

As shown in detail in FIG. 6, the wedge member 31 is formed in a right trapezoidal shape in which the outer surface 31b contacting the cutter blades 2 and 3 when viewed in the longitudinal direction, that is, the axial direction of the cutter mounting jig 1, is an inclined side. Therefore, the outer surface 31b of the wedge member 31 is formed on the second side wall surface of the slot 12 when the wedge member 31 is disposed between the slot inner wall surface 12c and the cutter blades 2 and 3, as shown in FIG. It intersects with 12b at an acute angle. The acute angle is preferably in the range of 40 to 80 degrees. In addition, the wedge member 31 is formed to be inclined in the longitudinal direction at a predetermined angle corresponding to the inclination of the slot 12 (specifically, both side wall surfaces 12a and 12b) viewed from the side of the cutter mounting jig 1. together are the thickness of the wedge member 31, the inner wall surface 12c of the wedge member upper end thickness t1 wedge member the lower end slot 12 than the thickness t2 of the size depending on the degree of inclination with respect to the axial direction of the cut mounting jig 1 Kunar (T1> t2). The concave portion 32 is provided in a groove shape extending in the horizontal direction at a portion near the upper end of the inner surface 31 a of the wedge member 31.

Claims (1)

A cutter mounting jig having a plurality of slots formed on the outer peripheral surface at predetermined intervals, a plurality of cutter blades inserted and arranged in each slot of the cutter mounting jig, and surrounding the plurality of cutter blades And a clamp ring mounted on the outer peripheral surface of the cutter mounting jig, and press and fix the outer side surface of the cutter blade with the tip of a fastening screw extending into each slot through a screw hole provided in the clamp ring. In the rotary cutting tool for gear cutting configured in
Each of the slots is positioned perpendicular to the first side wall surface on the front side in the rotational direction and the second side wall surface on the rear side in the rotational direction, which face each other in parallel with a predetermined interval, and the back side between the both side wall surfaces. An inner wall surface,
A plurality of adjusting means for adjusting the arrangement position of the cutter blade in each slot in the radial direction in a temporarily fixed state where the fixing of the cutter blade by pressing the fastening screw is slightly loosened is provided. A wedge member disposed between the inner wall surface of the slot and the cutter blade, the thickness of which changes in the axial direction of the cutter mounting jig, and a part of the wedge member that fits in the concave portion provided on the inner surface of the wedge member in contact with the inner wall surface of the slot; It consists of an adjustment screw screwed into a screw hole provided on the cutter mounting jig facing the inner wall surface of the slot.
The wedge member is formed in a right trapezoidal shape in which the outer surface in contact with the cutter blade when viewed in the axial direction of the cutter mounting jig is an inclined side, and the outer surface of the wedge member is an acute angle with respect to the second side wall surface of the slot. Crossing at
A rotary cutting tool for gear cutting, characterized in that the rear surface of each cutter blade is formed in contact with the second side wall surface of the slot and the inner side surface of each cutter blade is in contact with the outer surface of the wedge member.