JP2021011005A - Cutting tool - Google Patents

Abstract

To provide a cutting tool that enables helical flutes with different leads to be machined by one tool and that can reduce a component storage cost.SOLUTION: A cutting tool 1 comprises: a head part 10 that has an insert mounting seat 102 for being fitted with a cutting insert 101; a shank 20 that is mounted on the back end side of the head part 10 and that holds the head part 10; and a bolt 103 that fixes a position of the head part 10 with respect to the shank 20 when the head part 10 is mounted on the shank 20. The head part 10 can be mounted on the shank 20 in such a manner that an angle is changed around a central axis O.SELECTED DRAWING: Figure 1

Description

The present invention relates to a cutting tool.

As a cutting tool used for cutting a work material such as metal, the cutting tool described in Patent Document 1 is known.

Patent Document 1 describes a cutting tool including a head (main body 3) and a holder 2 connected to the rear side of the main body 3. The main body 3 is provided with a seat portion 4 (insert mounting seat) for cutting inserts in the front portion. The main body 3 is provided with a male shaft 6 protruding rearward from the rear end portion. When the main body 3 is connected to the holder 2, the male shaft 6 is introduced into the seat 7 in the holder 2 and the position of the main body 3 with respect to the holder 2 is fixed.

WO 1999/039852

In the configuration of Patent Document 1, when the head is mounted on the holder, the mounting posture of the cutting insert mounted on the insert mounting seat is fixed. Therefore, for example, when a twisted groove is machined around a round bar using the cutting tool of Patent Document 1, only one type of twisted groove can be machined, and a twisted groove having a different lead (length advancing per rotation) is machined. Can not. That is, when machining a twisted groove having different leads with the cutting tool of Patent Document 1, it is necessary to use a different tool each time, which may lead to an increase in parts storage cost.

Therefore, an object of the present invention is to provide a cutting tool capable of machining twisted grooves having different leads with one tool and reducing the cost of storing parts.

The cutting tool according to one aspect of the present invention is a cutting tool having a cutting insert extending along a central axis and cutting a work material on the tip side, having an insert mounting seat on the tip side, and an insert mounting seat. A head part to which a cutting insert is mounted, a holder to be mounted on the rear end side of the head part to hold the head part, and a fixing member for fixing the position of the head part with respect to the holder when the head part is attached to the holder. The head portion is configured to be mountable to the holder by changing the angle around the central axis.

According to the above aspect, the radial rake angle of the cutting insert provided on the head portion is changed by changing the angle of the head portion around the central axis and fixing the head portion to the holder with a fixing member so that the state is maintained. can do. This makes it possible to machine with different radial rake angles with one type of cutting insert. As a result, it is possible to machine a twisted groove having different leads with one tool, and it is possible to reduce the parts storage cost.

In the above embodiment, the head portion has an engaging portion composed of a concave portion or / and a convex portion on the connecting surface of the head portion connected to the holder, and the holder is on the surface of the holder connected to the head portion. , It may have an engaged portion composed of a convex portion and / or a concave portion that fits into the engaging portion.

In the above aspect, a plurality of recesses may be formed in the circumferential direction at the peripheral edge of the connecting surface.

In the above embodiment, the concave portion and the convex portion may be formed at symmetrical positions with respect to the central axis.

In the above embodiment, at least one of the head portion and the holder may be provided with a scale so that the rotation angle of the head portion can be adjusted by adjusting the scale.

In the above embodiment, the ring portion is further provided, one end surface of the ring portion has a first engaging portion that fits into the engaging portion of the head portion, and the other end surface of the ring portion has a holder. Has a second engaging portion that engages with the engaging portion of the head portion, the head portion is configured to be engaged with the ring portion by changing the angle around the central axis, and the holder is around the central axis. It is configured to be engageable with the ring portion by changing the angle, and the unit of change in the engagement angle of the head portion with respect to the ring portion may be different from the unit of change in the engagement angle of the holder with respect to the ring portion.

In the above embodiment, the engaging portion of the holder is composed of at least one convex portion, and the second engaging portion of the ring portion is composed of a plurality of grooves to which the convex portion of the engaging portion of the holder is engaged. The first engaging portion of the ring portion is composed of at least one convex portion, and the engaging portion of the head portion is composed of a plurality of groove portions with which the convex portion of the first engaging portion of the ring portion is engaged. It may have been.

At least one of the head portion or the ring portion is provided with a scale corresponding to a unit of change in the engagement angle of the head portion with respect to the ring portion, and at least one of the ring portion or the holder is a change in the engagement angle of the holder with respect to the ring portion. A scale corresponding to the unit may be provided, and the rotation angle of the head portion may be adjusted according to the scale.

According to the present invention, it is possible to provide a cutting tool capable of machining twisted grooves having different leads with one tool and reducing parts storage cost.

Perspective view showing the cutting tool of the first embodiment Front view of the cutting tool shown in FIG. 1 as viewed from the direction of arrow A1. Top view of the cutting tool shown in FIG. 1 as viewed from the direction of arrow A2. Left side view of the cutting tool shown in FIG. 1 as viewed from the direction of arrow A3. A perspective view of the head portion shown in FIG. 1 as viewed from the rear side. Right side view of the head portion shown in FIG. 5 as viewed from the direction of arrow B1. Front view of the head portion shown in FIG. 5 as viewed from the direction of arrow B2. A perspective view of the shank shown in FIG. 1 as viewed from the tip side. Left side view of the shank shown in FIG. 8 as viewed from the direction of arrow C1. Front view of the shank shown in FIG. 8 as viewed from the direction of arrow C2. Enlarged view of the area including the concave and convex parts when the head part and the shank are connected Perspective view of the head portion of the cutting tool of the second embodiment as viewed from the rear side. Perspective view of the shank of the cutting tool of the second embodiment as viewed from the tip side. Front view showing the cutting tool of the third embodiment Right side view showing the head portion of the cutting tool of FIG. Left side view showing the shank of the cutting tool of FIG. Perspective view showing the cutting tool of the 4th embodiment An exploded perspective view showing the configuration of the cutting tool of FIG. 17 in an exploded manner. The figure which shows the structure of the ring part in the cutting tool of FIG. Sectional drawing which shows the structure around the bolt in the cutting tool of 5th Embodiment The figure which shows the structure of the cutting tool of 6th Embodiment An exploded perspective view of the disassembled configuration of the cutting tool of FIG. 21 as viewed diagonally from the rear side. An exploded perspective view of the disassembled configuration of the cutting tool of FIG. 21 as viewed diagonally from the front side.

Preferred embodiments of the present invention will be described with reference to the accompanying drawings. The dimensions, shape, angle, etc. of the drawings may differ from the actual dimensions, shape, angle, etc. Therefore, the technical scope of the present invention is not limited to the dimensions, shapes, angles, etc. of each part shown in these drawings.

[First Embodiment]
The configuration of the cutting tool 1 according to the first embodiment will be described with reference to FIGS. 1 to 10. The cutting tool 1 is a turning tool that does not rotate the tool but rotates the work material for machining. 1 to 4 are diagrams showing the configuration of the cutting tool 1. 5 to 7 are views showing the configuration of the head portion 10. 8 to 10 are views showing the configuration of the shank (holder) 20.

The cutting tool 1 includes a shank 20 extending along the central axis O and a head portion 10. The head portion 10 is connected to the tip end side (left side in FIG. 2) of the shank 20.

The head portion 10 has an insert mounting seat 102 on the tip end side thereof, and the cutting insert 101 is mounted on the insert mounting seat 102. The cutting insert 101 is detachably attached to the insert mounting seat 102. In the first embodiment, the cutting insert 101 is mounted on the insert mounting seat 102 so that the cutting edge 101a of the cutting insert 101 projects outward (left side in FIG. 2) from the tip of the head portion 10. Cutting is performed by a portion of the cutting edge 101a protruding from the head portion 10. The shank 20 and the head portion 10 are arranged so that the tip of the cutting edge 101a of the cutting insert 101 is located on the axis of the central axis O (in other words, the shank 20) when viewed from above (FIG. 3). The head portion 10 may be connected to each other (so that its central axis is coaxial). As the cutting insert 101 of the first embodiment, an insert having a substantially quadrangular shape is used in a top view (FIG. 3), but the present invention is not limited to the illustrated mode, and a twisted groove (screw shape, groove shape, etc.) to be machined is used. ) Can be selected as appropriate according to the shape.

On the rear end side of the head portion 10, as shown in FIGS. 5 to 7, a male shaft 105 is provided at the center thereof. The male shaft 105 is located on the rear side (hereinafter referred to as the axial direction) of the central axis O extending from the central portion of the rear end surface 11 of the head portion 10 (the connecting surface 11 of the head portion 10 connected to the shank 20). It is provided so as to project to the right in FIG. 2 or FIG. The male shaft 105 has a substantially cylindrical shape centered on the central axis O. The male shaft 105 is provided so as to be introduced into the shaft hole 205a of the female shaft 205 provided in the shank 20 when the head portion 10 is attached to the shank 20. A through hole 104 for inserting the bolt 103 is formed in the head portion 10 so as to penetrate in the axial direction. When the head portion 10 is attached to the shank 20, the position of the head portion 10 with respect to the shank 20 is adjusted by inserting the bolt 103 into the through hole 104 formed in the head portion 10 and tightening the bolt 103 into the bolt fastening hole 203 of the shank 20. It is fixed. In the first embodiment, the through hole 104 for inserting the bolt 103 has a shape in which the long axis of the elongated hole is bent in an arc shape when the head portion 10 is viewed from the rear, and the connection surface 11 has a shape. It is formed in the peripheral part along the circumferential direction. By forming the through hole 104 in this way, as will be described later, when the angle of the head portion 10 is changed around the central axis O, the bolt 103 can be inserted into the through hole 104 with the angle changed. Can be. As a result, the head portion 10 and the shank 20 can be fixed in a state where the rotation angle of the head portion 10 is adjusted. In the first embodiment, the mode of the bolt 103 and the bolt fastening hole 203 is not particularly limited. For example, the bolt 103 has a shaft portion on which a male screw is cut, and the male screw is a bolt on which a female screw is cut. It may be configured to be fastened by screwing into the fastening hole 203.

The shank 20 is a member that holds the head portion 10, and is connected to the rear end side of the head portion 10. The shank 20 is provided so that its longitudinal direction extends along the central axis O, and has a substantially rectangular parallelepiped shape. As shown in FIG. 8, the shank 20 is provided with a female shaft 205 for mounting the head portion 10 on the tip end side thereof. The female shaft 205 has a substantially cylindrical shape, and a shaft hole 205a for introducing the male shaft 105 of the head portion 10 is formed in the central portion thereof. A bolt fastening hole 203 for tightening and fixing the bolt 103 is formed at a position of the female shaft 205 corresponding to the through hole 104 of the head portion 10. As shown in FIGS. 8 and 9, a plurality of bolt fastening holes 203 are formed on the front end surface 21 of the shank 20 at equal intervals in the circumferential direction.

In the illustrated example, the shank 20 has a substantially rectangular parallelepiped shape, but the present invention is not limited to this example, and any member connected to the head portion 10 and having a function of holding the head portion 10 is, for example, a substantially cylindrical shape. It can be changed to a shape or other shape as appropriate. The male shaft 105 and the female shaft 205 are also not limited to the illustrated form, and if the head portion 10 and the shank 20 can be connected with the rotation angle of the head portion 10 adjusted, the shape, size, etc. It can be changed as appropriate.

Further, in the first embodiment, three bolts 103 (fixing members) and three bolt fastening holes 203 through which the bolts 103 are inserted are provided, but the present invention is not limited to this example, and the head portion 10 and the shank 20 are fixed. The number of bolts 103 and bolt fastening holes 203 may be one, two, or four or more. Further, although the bolt 103 is used as an example of the fixing member in the first embodiment, another member can be used as the fixing member as long as the position of the head portion 10 with respect to the shank 20 can be fixed.

In the first embodiment, the head portion 10 is configured to be mountable to the shank 20 by changing the angle around the central axis O. In other words, the head portion 10 can fix the head portion 10 to the shank 20 in a state where the rotation angle relative to the shank 20 (rotation angle around the central axis O) is adjusted. Hereinafter, the angle adjusting mechanism of the head portion 10 with respect to the shank 20 will be described.

As shown in FIGS. 5 and 6, a plurality of recesses 107 are formed in the connecting surface 11 of the head portion 10 connected to the shank 20, and the recesses 107 are formed when the head portion 10 is attached to the shank 20. It fits with the convex portion 207 of the shank 20. The position of the head portion 10 with respect to the shank 20 is adjusted by fitting the concave portion 107 formed on the rear end surface 11 of the head portion 10 and the convex portion 207 formed on the front end surface 21 of the shank 20 in this way. , That posture (that is, the mounting posture of the cutting insert 101 attached to the tip of the head portion 10) is maintained. As described above, the position of the head portion 10 with respect to the shank 20 is fixed by fastening the bolt 103.

The connecting surface 11 has a substantially circular shape in a side view (when the head portion 10 is viewed from the rear end side as shown in FIG. 6), and the recess 107 is a peripheral portion of the connecting surface 11 in the circumferential direction. Multiple pieces are formed at equal intervals. By forming a plurality of recesses 107, the rotation angle of the head portion 10 with respect to the shank 20 can be adjusted in multiple stages. In the first embodiment, the recess 107 is formed at the peripheral edge of the connection surface 11 in 5 ° increments in the circumferential direction, and the recess 107 as a whole is in the range of −20 ° ≦ α ≦ 20 °, that is, the rotation angle of the head portion 10. Can be adjusted within a range of ± 20 ° around the central axis O.

In this way, the head portion 10 is provided by changing the angle of the head portion 10 around the central axis O and fixing the shank 20 and the head portion 10 by fastening bolts 103 so that the state is maintained. The radial rake angle of the cutting insert 101 can be changed. This makes it possible to machine with different radial rake angles with one type of cutting insert 101. More specifically, as shown in FIGS. 1 and 2, the head portion 10 is attached to the shank 20 so that the instruction groove S1 of the head portion 10 is located at a position indicating 0 ° of the scale S2 of the shank 20. When the position (when the concave portion 107 is fitted to the convex portion 207) is set to the reference position (the radial rake angle of the cutting insert 101 is 0 °), the radial rake angle of the cutting insert 101 is positive or negative (positive or negative) from the reference position. That is, the head portion 10 can be attached to the shank 20 to perform cutting while the head portion 10 is adjusted to −20 ° ≦ α ≦ 20 °). As described above, by enabling machining with different radial rake angles, it is possible to machine twisted grooves having different leads with one tool, and it is possible to reduce the cost of storing parts.

In the illustrated example, the recess 107 formed on the connection surface 11 of the head portion 10 is symmetrical with respect to the central axis O and is 5 in the range of −20 ° ≦ α ≦ 20 ° (FIG. 6). It is formed in ° increments. Further, the convex portion 207 fitted to the concave portion 107 is formed at a symmetrical position with the central axis O interposed therebetween. However, the present invention is not limited to the example in which the concave portion 107 and the convex portion 207 are positioned symmetrically with respect to the central axis O in this way. For example, a plurality of concave portions 107 are provided at one location on the peripheral edge of the connection surface 11, and one convex portion 207 that fits with the concave portion 107 is provided, whereby the angle of the head portion 10 can be adjusted around the central axis O. It may be configured as such. Further, for example, recesses 107 may be provided at three or more locations on the peripheral edge of the connection surface 11, and three or more convex portions 207 may be provided so as to correspond to the recess 107. That is, if the head portion 10 is configured to be attached to the shank 20 by changing the angle around the central axis O, the positions and the number of the concave portions 107 and the convex portions 207 can be appropriately changed.

In the first embodiment, on the outer peripheral surface of the female shaft 205 provided on the tip side of the shank 20, a scale S (the groove S1 for instructing the head portion 10 and the shank 20) in which the adjustment angle of the head portion 10 can be visually recognized is provided. The scale S2) is formed. By aligning the instruction groove S1 of the head portion 10 with the scale S2 of the shank 20, it is possible to set the angle accurately to an arbitrary angle as compared with the configuration without the scale, and the angle can be easily adjusted. It can be carried out. In the first embodiment, the scale S2 is formed in increments of 5 °, but the display of the scale (large or small of the scale) can be arbitrarily set according to the adjustment angle of the head portion 10.

FIG. 11 is an enlarged view of a region including the concave portion 107 and the convex portion 207 when the head portion 10 and the shank 20 are connected. As shown in the figure, the convex portion 207 provided on the shank 20 has a mountain-shaped cross-sectional view protruding from the front end surface 21 of the shank 20 to the front side in the axial direction (left side in FIGS. 10 and 11). .. The angle θg formed by the extension lines (broken lines shown in FIG. 11) extending from the side sides of the convex portion 207 is set to, for example, 60 °. The recess 107 formed on the rear end surface 11 of the head portion 10 is provided with a gap G from the outer edge of the convex portion 207 so as to be along the outer edge of the convex portion 207, and is rearward of the head portion 10 so as to be along the gap G. It has a shape recessed from the end face 11. That is, as shown in FIG. 11, there is a gap G in the gap between the mountain portion forming the convex portion 207 and the valley portion forming the concave portion 107. When the head portion 10 and the shank 20 are mounted, the position of the head portion 10 is fixed by fastening the bolt 103 with the gap G provided in this way. With this configuration, every time the head portion 10 is attached to the shank 20 by changing the angle around the central axis O, it is suppressed that the convex portion 207 and the concave portion 107 come into contact with each other, and as a result, the convex portion 207 and the convex portion 207 It is possible to prevent the recess 107 from being worn.

In the embodiment described above, in order to adjust the angle of the head portion 10 around the central axis O, the head portion 10 is provided with a concave portion 107 (engaged portion), and the shank 20 is provided with a convex portion 207 (engaged portion). However, the opposite configuration (that is, a configuration in which a convex portion (engaged portion) is provided in the head portion 10 and a concave portion 107 (engaged portion) is provided in the shank 20) may be used.

Further, in the embodiment described above, the head portion 10 is provided with the concave portion 107, the shank 20 is provided with the convex portion 207, and the scale S (groove S1 for instructing the head portion 10) for visually recognizing the adjustment angle of the head portion 10 is provided. The shank 20 is provided with the scale S2), but for example, the scale S may not be provided and only the concave portion 107 and the convex portion 207 may be provided. As a result, the adjustment angle of the head portion 10 can be easily adjusted according to the shapes of the concave portion 107 and the convex portion 207 formed by setting the predetermined width in advance. By providing the concave portion 107 and the convex portion 207 (that is, the configuration having serrations), the workability at the time of angle adjustment is improved, and the working time can be shortened.

[Second Embodiment]
12 and 13 are perspective views showing a head portion 10B and a shank 20B in the cutting tool of the second embodiment. FIG. 12 is a perspective view of the head portion 10B viewed from the rear side, and FIG. 13 is a perspective view of the shank 20B viewed from the front side (tip side). The head portion 10B and the shank 20B shown in FIGS. 12 and 13 are obtained by changing the configurations of the head portion 10 and the shank 20 shown in the first embodiment, and other configurations and functions are the same as those of the first embodiment. is there. Therefore, the same reference numerals as those of the first embodiment are used for the same parts as the head portion 10 and the shank 20 shown in the first embodiment, and the description thereof will be omitted.

As shown in FIGS. 12 and 13, the connection portion between the head portion 10B and the shank 20B in the second embodiment (the connection surface 11b shown in FIG. 12 and the front end surface 21b shown in FIG. 13) is shown in the first embodiment. The concave portion 107 and the convex portion 207 are not provided. As a result, the angle of the head portion 10B can be arbitrarily adjusted within the operable range of the radial rake. Compared with the configuration in which the concave portion 107 and the convex portion 207 are provided as shown in the first embodiment, finer angle adjustment is possible. In the second embodiment, as in the first embodiment, the head portion 10B and the shank 20B are provided with scales (scales S1 and S2), so that the adjustment angle can be confirmed.

[Third Embodiment]
14 to 16 are views showing the configuration of the cutting tool 1C of the third embodiment. FIG. 14 is a front view of the cutting tool 1C of the third embodiment as viewed from the same direction as in FIG. FIG. 15 is a right side view of the head portion 10C as viewed from the same direction as in FIG. FIG. 16 is a left side view of the shank 20C as viewed from the same direction as in FIG. The cutting tool 1C (head portion 10C and shank 20C) shown in FIGS. 14 to 16 has a shape of a connection portion between the head portion 10 and the shank 20 shown in the first embodiment, and has other configurations and other configurations. The function is the same as that of the first embodiment. Therefore, the same reference numerals as those of the first embodiment are used for the same parts as those of the first embodiment, and the description thereof will be omitted.

As shown in FIGS. 14 to 16, in the third embodiment, the diameter of the connecting portion between the head portion 10C and the shank 20C is increased. Specifically, the outer diameter D1 of the connecting surface 11c and the front end surface 21c to which the head portion 10C and the shank 20C are connected is made larger than the outer diameter D2 (FIG. 14) of the shank 20C. As a result, the pitch of the recess 107c formed on the peripheral edge of the connection surface 11c of the head portion 10C can be made finer as compared with the configuration of the first embodiment. That is, the recess 107 in the first embodiment can be formed at the peripheral edge of the connecting surface 11 in the circumferential direction, for example, in increments of θ = 5 ° (FIG. 6), whereas the recess 107c in the third embodiment is It can be formed at an angle θc (FIG. 15) smaller than θ (FIG. 6) shown in the first embodiment. A finer angle can be adjusted by fitting the recess 107c formed in this way with the convex portion 207c of the front end surface 21c of the shank 20C to adjust the angle of the head portion 10C. ..

[Fourth Embodiment]
17 to 19 are diagrams showing the configuration of the cutting tool 1D of the fourth embodiment. FIG. 17 is a perspective view of the cutting tool 1D as viewed from the front side. FIG. 18 is an exploded perspective view showing the configuration of the cutting tool 1D in an exploded manner. FIG. 19 is a diagram showing a ring portion 30 of FIGS. 17 and 18. The cutting tool 1D shown in FIGS. 17 to 19 has the configuration of the ring portion 30 added to the head portion 10 and the shank 20 shown in the first embodiment, and other configurations and functions are the same as those of the first embodiment. Is. Therefore, the same reference numerals as those of the first embodiment are used for the same parts as the head portion 10 and the shank 20 shown in the first embodiment, and the description thereof will be omitted.

As shown in FIGS. 17 and 18, in the fourth embodiment, the ring portion 30 is provided between the head portion 10 and the shank 20 shown in the first embodiment. A left side view of the ring portion 30 viewed from the front is shown in FIG. 19 (A), a front view of the ring portion 30 viewed from the same direction as in FIG. 2 is shown in FIG. 19 (B), and the ring portion 30 is viewed from the rear. The right side view as seen is shown in FIG. 19 (C).

The ring portion 30 is formed in a substantially annular shape when viewed from the central axis O direction. A through hole 305 for inserting the male shaft 105 of the head portion 10 is formed in the central portion of the ring portion 30. Through this through hole 305, the male shaft 105 of the head portion 10 can be introduced into the shaft hole 205a of the female shaft 205 of the shank 20, and the head portion 10 and the shank 20 can be connected to each other. A through hole 304 for inserting the bolt 103 is formed in the peripheral portion of the ring portion 30 at a position corresponding to the through hole 104 of the head portion 10. By fastening the bolt 103 inserted through the through hole 104 of the head portion 10 to the bolt fastening hole 203 (see FIG. 8 and the like) of the shank 20 through the through hole 304 of the ring portion 30, the head portion is passed through the ring portion 30. The 10 and the shank 20 can be fixed.

As shown in FIG. 19, a convex portion 307a as a first engaging portion is formed on the front end surface 31a (tip surface) of the ring portion 30, and a second engagement is formed on the rear end surface 31b of the ring portion 30. A recess 307b is formed as a joint. A plurality of recesses 307b are formed at equal intervals along the circumferential direction at the peripheral edge of the rear end surface 31b. The convex portion 307a formed on the front end surface 31a of the ring portion 30 is configured to be fitted into a plurality of recesses 107 (engaging portions) formed on the connection surface 11 of the head portion 10, and the rear end surface 31b of the ring portion 30 is formed. The plurality of recesses 307b formed in the shank 20 are configured to be fitable to the convex portion 207 (engagement portion) formed in the shank 20. With this configuration, the angle (engagement angle) of the head portion 10 with respect to the ring portion 30 is adjusted by adjusting the fitting of the plurality of concave portions 107 formed in the head portion 10 and the convex portion 307a of the ring portion 30. The angle (engagement angle) of the shank 20 with respect to the ring portion 30 is adjusted by adjusting the fitting of the concave portions 307b formed in the ring portion 30 and the convex portion 207 of the shank 20. As a result, the angle of the head portion 10 with respect to the shank 20 can be adjusted via the ring portion 30. The unit of change in the engagement angle of the head portion 10 with respect to the ring portion 30 is different from the unit of change in the engagement angle of the shank 20 with respect to the ring portion 30. For example, the concave portion 107 of the head portion 10 is formed in the peripheral portion of the connecting surface 11 in the circumferential direction in steps of θ = 5 ° (FIG. 6), and the concave portion 307b of the ring portion 30 is formed in the peripheral portion of the rear end surface 31b in the circumferential direction. It is formed in increments of θd = 4 ° (FIG. 19 (C)). By adjusting each angle via the ring portion 30, the radial rake adjustment angle of the head portion 10 can be adjusted in 1 ° increments.

[Fifth Embodiment]
FIG. 20 is a cross-sectional view showing a configuration around a bolt of the cutting tool 1E of the fifth embodiment. The cutting tool 1E of the fifth embodiment has a modified configuration of the bolt 103e and the like, and other configurations and functions are the same as those of the first embodiment. Therefore, the same reference numerals as those of the first embodiment are used for the same parts as the head portion 10 and the shank 20 shown in the first embodiment, and the description thereof will be omitted.

FIG. 20 (A) shows a state in which the concave portion 107 of the head portion 10 and the convex portion 207 of the shank 20 are fitted, and FIG. 20 (B) shows the concave portion 107 of the head portion 10 and the convex portion 207 of the shank 20. Indicates a state in which the mating with is released. In the fifth embodiment, the threaded length L3 of the bolt 103e is made larger than the height L1 of the convex portion 207. As a result, the bolt 103e can maintain the fastened state with the bolt fastening hole 203 even in the state where the concave portion 107 and the convex portion 207 are released from the fitting (FIG. 20B). As a result, the radial rake of the head portion 10 can be adjusted simply by loosening the bolt 103e without completely removing the bolt 103e.

[Sixth Embodiment]
21 to 23 are views showing the configuration of the cutting tool 1F of the sixth embodiment. FIG. 21A is a front view of the cutting tool 1F of the sixth embodiment as viewed from the same direction as in FIG. 21 (B) is an enlarged view of the broken line frame a portion of FIG. 21 (A). FIG. 22 is an exploded perspective view of the configuration of the cutting tool 1F shown in FIG. 21 as viewed from an obliquely rear side. FIG. 23 is an exploded perspective view of the configuration of the cutting tool 1F shown in FIG. 21 as viewed from an obliquely front side. The cutting tool 1F of the sixth embodiment is a modification of the scale configuration shown in the cutting tool 1D (FIGS. 17 and 18) of the fourth embodiment, and the other configurations and functions are the same as those of the fourth embodiment. Is. Therefore, the same reference numerals as those of the fourth embodiment are used for the same parts as those of the fourth embodiment, and the description thereof will be omitted. The interval θ of the scale S2 of the head portion 10F (FIG. 21 (B)) is matched with the serration interval θ (FIG. 22) of the recess 107 of the head portion 10F, and the interval θ of the scale S2 is, for example, 5 °. .. The interval θd of the scale S3 of the ring portion 30F (FIG. 21 (B)) is matched with the serration interval θd (FIG. 22) of the recess 307b of the ring portion 30F, and the interval θd of the scale S3 is, for example, 4 °.

In the cutting tool 1F of the sixth embodiment, as shown in FIGS. 21 to 23, the shank 20F is not graduated, but the head portion 10F and the ring portion 30F are graduated, respectively. Specifically, a scale S2 having a scale interval of θ = 5 ° is formed on the head portion 10F, and a groove S1 for instructing to match the scale S2 is a ring portion 30F (head portion 10F of the ring portion 30F). Is formed on the side). Further, a scale S3 having a scale interval of θd = 4 ° is formed on the shank 20F side of the ring portion 30F, and a groove S1 for instructing to match the scale S3 is formed on the shank 20F. In this way, the head portion 10F is formed with a scale S2 in increments of θ = 5 °, and the groove S1 that matches the scale S2 is formed in the ring portion 30F, whereby the head portion 10F is formed in increments of 5 ° with respect to the ring portion 30F. Can be easily adjusted with. Further, by forming a scale S3 in increments of θd = 4 ° in the ring portion 30F and forming a groove S1 for instruction in the shank 20F, the shank 20F can be easily adjusted in increments of 4 ° with respect to the ring portion 30F. Can be done. By combining the angle adjustment of the ring portion 30F and the angle adjustment of the head portion 10 configured in this way, the radial rake adjustment angle of the head portion 10 can be adjusted in 1 ° increments, and finer angle adjustment becomes possible.

The embodiments described above are for facilitating the understanding of the present invention, and are not for limiting and interpreting the present invention. The flowchart, sequence, each element included in the embodiment, its arrangement, material, condition, shape, size, and the like described in the embodiment are not limited to those exemplified, and can be changed as appropriate. In addition, the configurations shown in different embodiments can be partially replaced or combined.

1 ... cutting tool, 10 ... head part, 11 ... connection surface, 20 ... shank (holder), 101 ... cutting insert, 102 ... insert mounting seat, 107 ... concave part, 207 ... convex part, S1, S2 ... scale

Claims (8)

A cutting tool equipped with a cutting insert that extends along the central axis and cuts the work material on the tip side.
A head portion having an insert mounting seat on the tip side and mounting the cutting insert on the insert mounting seat,
A holder mounted on the rear end side of the head portion and holding the head portion,
When the head portion is attached to the holder, a fixing member for fixing the position of the head portion with respect to the holder is provided.
The head portion is configured to be mountable to the holder by changing the angle around the central axis.
Cutting tools. The head portion has an engaging portion composed of a concave portion and / or a convex portion on a connecting surface of the head portion connected to the holder.
The holder has an engaged portion composed of a convex portion and / or a concave portion that fits into the engaging portion on a surface of the holder that is connected to the head portion.
The cutting tool according to claim 1. A plurality of the recesses are formed in the circumferential direction at the peripheral edge of the connection surface.
The cutting tool according to claim 2. The concave portion and the convex portion are formed at symmetrical positions with respect to the central axis.
The cutting tool according to claim 2 or 3. A scale is provided on at least one of the head portion and the holder.
The rotation angle of the head portion can be adjusted by adjusting the scale.
The cutting tool according to any one of claims 1 to 4. With a ring part
One end face of the ring portion has a first engaging portion that fits into the engaging portion of the head portion, and the other end face of the ring portion engages with the engaging portion of the holder. Has a second engaging part,
The head portion is configured to be engaged with the ring portion by changing the angle around the central axis.
The holder is configured to be engaged with the ring portion by changing the angle around the central axis.
The unit of change in the engagement angle of the head portion with respect to the ring portion is different from the unit of change in the engagement angle of the holder with respect to the ring portion.
The cutting tool according to claim 1. The engaging portion of the holder is composed of at least one convex portion.
The second engaging portion of the ring portion is composed of a plurality of groove portions with which the convex portion of the engaging portion of the holder is engaged.
The first engaging portion of the ring portion is composed of at least one convex portion.
The engaging portion of the head portion is composed of a plurality of groove portions with which the convex portion of the first engaging portion of the ring portion engages.
The cutting tool according to claim 6. At least one of the head portion or the ring portion includes a scale corresponding to a unit of change in the engagement angle of the head portion with respect to the ring portion.
At least one of the ring portion or the holder is provided with a scale corresponding to a unit of change in the engagement angle of the holder with respect to the ring portion.
The rotation angle of the head portion can be adjusted by adjusting the scale.
The cutting tool according to claim 6 or 7.

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