JP2809536B2 - Cutting tools - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting tool in a predetermined advancing direction and a rotation about a rotation axis by being fitted into a tool mounting hole provided at the tip of a rotary spindle of a machine tool. (Hereinafter referred to as C-axis rotation) relates to a structure of a cutting tool capable of changing the direction of the cutting blade to change the direction of the cutting by changing the direction of the cutting blade. It has at least one slit that forms a fulcrum for elastic deformation to prevent force fluctuations and adverse effects such as galling and biting, and at the same time, mechanical stiffness in the upper region of the cutting blade according to changes in processing conditions. Equipped with rigidity adjusting means that can adjust and set the degree appropriately, a single tool can perform cutting processing that responds to fluctuations in processing conditions, and precision machining that forms a dense machining surface from rough cutting of work Cutting consistently related to that can be performed Hale byte-shaped cutting tools of up to.

[0002]

2. Description of the Related Art It has been well known that a hale bite is used as a cutting tool in a machine tool, particularly a machine tool such as a lathe, a planing machine, and a shaping machine. Types of thread cutting tools and the like are mainly known. This type of hail bite is a cutting tool characterized by having a U-shaped bent spring action portion in the tool tip region near the cutting blade to prevent galling or biting during the cutting operation. With this type of conventional hail bite, the posture of the work with respect to the work is not changed during processing, and processing of desired dimensions can be performed if the positional relationship between the cutting edge of the hail bite and the work is determined before processing.

On the other hand, recently, there has been a demand for performing a cutting process such as a grooving process on a work having a planar processing surface by a milling machine tool. For example, in mold processing, etc., simply
There is also a demand for precisely processing not only straight grooves but also grooves along closed curves. Conventionally, in such a curved groove, processing using an end mill as a cutting tool is generally performed.
In this end milling method, since the cutting is performed while the tool itself has a rotation axis and rotates, the shape of the processing groove is necessarily limited to a symmetrical cross section. When cutting a groove with an asymmetrical cross section, it is necessary to move a cutting blade of a shape that matches the cross-sectional shape of the groove relatively along the curved path between the workpiece and the cutting edge. Since the trajectory is not a straight trajectory as in the case of machining, it is necessary to give the cutting tool itself a C-axis rotation that changes the traveling direction along with the curved trajectory. Therefore, even if the C-axis rotation function is provided, a desired processing dimensional accuracy can be obtained, and the processing cross section of the work can be applied to both symmetrical and asymmetrical cutting processing, and the work can be performed with a fine finish surface roughness. As a result of the development and devising to provide a cutting tool capable of mainly performing grooving, the present applicant has developed an elastically deformable cutting tool that is mounted on a machine tool having a C-axis axis and performs cutting on a work surface. A cutting tool of a hail bite type having a slit for forming a fulcrum in an upper region of the cutting blade is constituted, and the cutting tool has a shank having an axis coincident with the axis of the C axis, and A cutting blade having a desired shape is fixed to a mounting surface of the cutting blade formed as a plane including the axis by a predetermined fixing means, and the elastic deformation fulcrum is located in a front area of the mounting surface when viewed in the cutting direction of the cutting blade. Elastically reduce the cutting reaction force By absorbing, the cutting reaction force is kept within a certain fluctuation, and the cutting action is advanced by moving the cutting blade relative to the workpiece along a predetermined trajectory while preventing galling and biting. At the same time, a hale bite cutting tool is provided which enables a cutting locus to be selected as a curved locus by rotating the C-axis, and enables arbitrary machining grooves having a symmetrical and asymmetrical cross section to be machined on the work surface. .

[0004]

However, the above-mentioned C
There is still a need for structural improvement in a cutting tool that has a curve trajectory machining performance due to shaft rotation and that can cut any machining groove having a symmetrical or asymmetrical cross section. In other words, the processing conditions of this type of hail bite type cutting tool, for example, when the width and depth dimensions of the groove to be cut on the work surface change between works or when the machinability of the work material changes, etc. In one cutting tool, even if the cutting blade is changed variously, the elastic deformation performance based on the elastic deformation fulcrum formed by the slit provided in the upper region of the cutting blade is uniform, so the mechanical of the cutting tool is There is also a problem that the rigidity is inevitably uniform, and a proper cutting process cannot be performed. That is, for example, when the machining groove of the work is wide, the mechanical rigidity in the upper region of the cutting blade of the cutting tool needs to be relatively large, and on the other hand, the groove depth is shallow, and the narrow groove cutting is performed. In machining, etc., it is necessary that the elastic deformation function is large and the mechanical rigidity is rather small.Therefore, a plurality of cutting tools having different mechanical rigidities are prepared in advance, and the tools need to be changed according to changes in machining conditions. There is a need to do.

Similarly, with a cutting tool having the above-mentioned uniform mechanical rigidity, it is impossible to perform cutting with a single cutting tool consistently from roughing to precision machining of a work. In order to improve the finishing accuracy of the cutting surface in the precision processing stage, it is necessary to prepare a plurality of cutting tools having different mechanical stiffness in advance and exchange them according to the progress of the processing, which is cumbersome. is there.

Accordingly, an object of the present invention is to provide a means for adjusting the mechanical rigidity of a single halved tool in a simple manner each time it is mounted on the main shaft of a machine tool according to changes in cutting conditions. It is intended to provide a cutting tool having a structure having: Another object of the present invention is to provide a cutting tool having a structure capable of absorbing vibration of a cutting edge based on a cutting reaction force applied to a cutting blade at the time of cutting along with adjustment of mechanical rigidity. is there.

[0007]

SUMMARY OF THE INVENTION In view of the above-mentioned object, the present invention comprises a mounting portion held by a tool holding portion of a machine and a cutting blade holding portion extending from the mounting portion to a distal end side. A shank, a cutting blade attached to a tip of the cutting blade holding portion of the shank, and an oblique direction to an axial direction of the mounting portion from a lateral side surface of the cutting blade holding portion of the shank, and
A plurality of slits are cut in parallel to each other to an inner depth position of a predetermined depth, the plurality of slits having the inner depth position as an elastic deformation fulcrum, and intersecting with the plurality of slits, and penetrating the shank to cut the shank. A screw hole cut into the blade holding portion is screwed into the screw hole, and is screwed from the outside of the cutting blade holding portion and advanced and retracted to suppress the elastic deformation function of the slit selected from the plurality of slits. And a rigidity adjusting means comprising a bolt.

Further, according to the present invention, a shank comprising a mounting portion held by a tool holding portion of a machine and a cutting blade holding portion extending from the mounting portion to a tip end side, and the cutting blade of the shank A cutting blade attached to the tip of the holding portion, one slit cut obliquely from the lateral side surface of the cutting blade holding portion of the shank with respect to the axial direction of the mounting portion, and crossing the slit. Is attached to a hole formed in the shank by a bolt, and is fixed to the cutting blade holding portion of the shank with a bolt, and elastically expands in a radial direction in accordance with a fixing force of the bolt, and is attached to an inner wall of the hole. And a rigidity adjusting means having an elastic ring for generating a pressing force.

[0009]

According to the cutting tool of the present invention, the shank holding the cutting blade is held in a region above the cutting blade in the cutting blade holding portion of the shank, that is, the mounting portion held by the tool holding portion of the machine and the tip of the cutting blade holding portion. The mechanical stiffness in the area extending between the cutting edge and the cutting blade can be easily adjusted by a manual adjustment operation by moving the bolt forward, backward, or tightening from the outside of the shank. Cutting conditions including changes in the shape and dimensions of the processed part such as grooves to be formed, when the work material is changed, or when the processing process from rough cutting to precision cutting changes. Even if there is a change in the cutting tool, the worker adjusts the mechanical rigidity of the cutting tool while the cutting tool is mounted on the main spindle of the machine tool, and the appropriate level of mechanical rigidity is cut in the area above the cutting blade. Attached to blade holder And, with a single tool, in response to changes in the cutting conditions, it is possible to perform a proper cutting. Further, when an elastic ring is used as the mechanical rigidity adjusting means, the elastic ring can be pressed against the slit forming the elastic deformation fulcrum and arranged to have a vibration damping function. Due to the vibration absorption at the time, the surface accuracy of the cut surface can be improved.

In the cutting tool according to the present invention, when the cutting blade advances relative to the workpiece along a predetermined trajectory, a cutting groove having a symmetrical cross-sectional shape or an asymmetrical cross-sectional shape according to the blade shape of the cutting blade is formed. Needless to say, the workpiece can be cut on the work surface, and the traveling locus of the cutting blade can follow a curved locus according to the rotation of the C-axis. And, the cutting reaction force acting on the cutting blade, in the area in front of the cutting blade mounting surface of the shank,
Since the shank at the elastic deformation fulcrum formed by the slit is always absorbed and suppressed to a constant level of reaction force by the spring elastic action of the shank, as a result, the variation of the cutting amount during cutting is suppressed, and the cutting blade is cut. Demonstrating a stable cutting force regardless of the amount is the same as the previously proposed halebite type cutting tool. Hereinafter, the present invention will be described in more detail based on embodiments shown in the accompanying drawings.

[0011]

1 is a sectional front view of a first embodiment of a cutting tool according to the present invention, FIG. 2 is a sectional view taken along line 2-2 of FIG.
FIG. 3 is a sectional front view of a second embodiment of the cutting tool according to the present invention, FIG. 4 is an explanatory view of the operation of the elastic ring body of the embodiment of FIG. 3, and FIG. It is a schematic perspective view.

Referring to FIGS. 1 and 2, a cutting tool 10 according to the present invention is provided with a tool mounting hole 9 of a chuck 8 provided at the tip of a rotating spindle of a machine tool, and an axial center at a C-axis rotation center "C" of the spindle. Is mounted as a tool that performs a cutting process by performing relative movement along a desired straight line or curved locus with a work (not shown). The shank 20, the cutting blade 40, and the shank 20 A set screw 30 forming a fixing means for fixing the cutting blade 40 to the cutting blade 40.

The shank 20 has a round bar-shaped mounting portion 22 fitted and mounted in the mounting hole 9 of the chuck 8 without play, and an extension hanging downward from the position of the chuck end 8a of the mounting portion 22. Blade holding part 24 formed as a part
The mounting portion 22 has a mounting hole 9 for the chuck 8.
A screw seat 25 is formed so as to be securely fastened with an appropriate number of lock screws 18. And this mounting part 22
Is a cylindrical body having an axis that coincides with the rotation axis C when firmly fixed to the mounting hole 9 with the lock screw 18.

On the other hand, the integrated cutting blade holding portion 24 extending downward from the mounting portion 22 has a concave portion which forms a vertically flat cutting blade mounting surface 26 for mounting the cutting blade 40 at the lower end. The blade 40 is inserted into the recess from below, and abuts the front surface 42 in close contact with the mounting reference surface 26.
It is pressed from the rear surface 44 side by a set screw 30 as fixing means and is fixed to the cutting blade mounting surface 26. That is, the cutting blade 4
Numeral 0 has a flat shape, and a cutting edge 46 having various blade shapes is provided at a lower end of the front surface 42, and a flank 47 is provided between the front surface 42 and the rear surface 44.

The cutting blade mounting surface 26 formed on the cutting blade holding portion 24 of the shank 20 forms a plane including the axis C extending from the mounting portion 22. The front surface 42 of the cutting blade 40 in contact with the mounting surface 26
, The axial center comes into the front surface 42 when the abutment is made.

The cutting blade holding portion 24 has three slits 28a, 28b, 28c cut in a direction above the cutting blade mounting surface 26 in a direction crossing the axis "C".
Is inclined from the side surface of the cutting blade holding portion 24 toward the inside,
Further, they are formed in a mutually parallel arrangement. That is, these slits 28a to 28c pass through the axis C and
a, 29b, and 29c, a predetermined gap dimension S and depth dimensions L1, L2, L3 (L1 <L2
<L3), and is provided as a kerf extending over the entire width of the shank 20, that is, a kerf penetrating in a direction perpendicular to the paper surface of FIG. These inner positions 29a, 29
The b and 29c are arranged on the front side of the cutting blade mounting surface 26 when viewed in a direction (arrow P) relatively advanced with respect to the workpiece during the cutting action of the cutting blade 40, and the slit having such a depth is provided. With the provision of 28a to 28c, the lower end region of the cutting blade holding portion 24 having the cutting blade mounting surface 26 in the shank 20 elastically moves in the direction of expanding and contracting the slit gap with the inner depth positions 29a to 29c as fulcrums. It is deformable. That is, the cutting tool 10 of the present invention has a configuration that functions as a tool having a spring action using the fulcrums 29a to 29c and the like as deformation fulcrums, like the well-known hail bite.

Further, according to the present invention, in the cutting blade holding portion 24 of the shank 20, the three slits 28a to 28c intersect in common, and each slit 28
A screw hole 31 having a predetermined screw size is provided so as to pass through a substantially central portion in the width direction such as a (see FIG. 2), and the screw hole 31 is eventually a tap hole penetrating to another side surface. It is formed as. A bolt 32 is screwed into the screw hole 31. Although the length of the bolt 32 is illustrated in FIG. 1 as having a length that passes through the slit 28c provided at the uppermost portion, the length of the bolt 28 may be changed between the slit 28c and the slit 28b at the center as necessary. Bolts of a length passing both may be engaged, and furthermore,
It is also possible to select and use a screw length in which the bolt 32 is engaged from the side opposite to the illustrated example and is engaged while passing only through the lowermost slit 28a. It should be noted here that the slit in which the bolt 32 is engaged, for example,
In the slit 28c of FIG.
A block action for suppressing the elastic deformation function with the inner depth position 29c as a fulcrum of the cutting tool 8c is performed. As a result, the mechanical rigidity in the upper region of the cutting blade 40 held by the cutting blade holding portion 24 of the cutting tool 10 changes. It is a point that can be made. In this manner, any one of the three slits 28a to 28c or any two of the slits or the like is blocked by using the bolt 32, and the mechanical rigidity in the upper region of the cutting blade 40 is determined by the operator according to each. Can be adjusted. Then, by adjusting the mechanical rigidity, as described later, 1
One cutting tool 10 can respond to changes in various cutting conditions. The inner diameter of the screw hole 31, that is, the outer diameter of the screw of the bolt 32 intersects the slit 28a and the like, and is designed and selected in advance so that the mechanical rigidity can be remarkably adjusted when the blocking action is performed. Needless to say.

On the other hand, the cutting edge 46 of the cutting blade 40 fixed to the cutting blade mounting surface 26 with the set screw 30 has a cutting edge shape corresponding to various processing shapes. , Formed to have a cutting edge shape defined by a straight or curved continuous line extending in the left-right direction with respect to the cutting progress direction P about an axis that coincides with the axis C existing in the front surface 42. ing. The cutting blade 40 has a cutting edge 4
When the front surface 42 having the lower end 6 is in contact with the cutting blade mounting surface 26, the axis C existing in the reference mounting surface 26 coincides with the center line defined by the shape of the cutting blade 46 described above. It is formed so that positioning in the left-right direction with respect to the traveling direction P can be performed. The cutting blade 40 is provided with the set screw 3 shown in the illustrated example.
Instead of a structure in which the fixing is made to be freely replaceable at 0, a structure integrally fixed by brazing or the like may be used.

Here, the overall configuration of a machine tool on which the cutting tool 10 according to the first embodiment of the present invention is mounted will be briefly described. FIG. 5 is a mechanism diagram of a machine tool that performs cutting with the cutting tool 10 of the present invention mounted thereon, and W denotes a work which is a workpiece, which is mounted and fixed on a work table 72 below the cutting tool 10. You. An X-axis and Y-axis feed mechanism 74 is provided below the column 73 of the machine tool.
The feed mechanism 74 has a cross guide surface structure so that the work table 72 on which the work W is mounted can be fed in the X-axis and Y-axis directions. An X-axis feed motor 75 and a Y-axis feed motor 76 are provided respectively. attached.

A Z-axis feed mechanism 7 is provided above the column 73.
The Z-axis feed mechanism 77 has a guide structure capable of cutting and feeding the cutting tool 10 in the Z-axis direction, and has a Z-axis feed motor 78. A tool spindle head 79 is attached to a movable portion of the Z-axis feed mechanism 77, and the above-described rotary tool spindle 7 is provided therein. A cutting tool 10 is fitted and mounted in a tool mounting hole below the rotary tool spindle 7 via a chuck 8, and the upper part of the rotary tool spindle 7 is C
It is connected to a shaft drive motor 81.

The rotary tool main shaft 7 is rotatably supported around its axis. This rotary feed shaft is called a C-axis, and the rotation angle is controlled by a C-axis drive motor 81. . The machine tool includes an X-axis feed motor 75, a Y-axis feed motor 7 based on numerical control information given to a control device 82 comprising a numerical control device.
6. A drive signal is appropriately issued to the Z-axis feed motor 78 and the C-axis drive motor 81 to drive the X-axis, Y-axis, Z-axis and C-axis of the machine tool, so that the workpiece W The workpiece W is relatively moved along a desired trajectory, and the workpiece W is subjected to cutting such as grooving by the cutting blade 40 of the cutting tool 10. As described above, in the conventional end mill, the cutting edge itself of the tool rotates at a high speed to perform the cutting action, so that the shape of the machining groove is limited to a symmetrical shape. However, in the cutting tool 10 of the present invention, the cutting direction is simply changed. In order to do so, the C-axis rotation is performed, and the cutting action is performed by the cutting edge 46 of the cutting blade 40 of the tool 10 progressing along the trajectory, so that the processing of an asymmetrical shape can also be performed.

Further, in the present invention, as described above, the cutting blade holding portion 24 of the shank 20 of the cutting tool 10 is provided with an elastic deformation fulcrum similar to a hale bite having the fulcrum at the inner depth positions 29a to 29c of the slits 28a to 28c. Since the positions 29a to 29c of the fulcrum of elastic deformation are present in front of the cutting blade 40 in the traveling direction P of the cutting action (see FIG. 1), the cutting reaction force during the cutting action is a slit. An integral elastic deformation of the cutting blade holder 24 and the cutting blade 40 is generated so as to expand and contract the gap width S such as 28a. Therefore, the relative positional relationship between the processing surface of the workpiece W and the cutting edge 46 of the cutting blade 40 of the tool 10 fluctuates in the cutting process due to vibration transmitted from the machine side, and the cutting reaction force fluctuates. However, the fluctuating reaction force is absorbed and suppressed by the integral elastic deformation of the region below the cutting blade holding portion 24 and the cutting blade 40.
In particular, since excessive cutting reaction force is absorbed and suppressed by elastic deformation and is maintained within a stable reaction force range, there is no danger that the cutting edge 46 of the cutting blade 40 may bite or bite with the work. In addition, the cutting amount does not fluctuate during the cutting process. This means that the cutting depth of the cutting blade 40 in the Z-axis direction (the direction normal to the workpiece) is, for example, 2
It is also possible to perform cutting without causing slip by setting a small value of 0 micron or less, and as a result, fine control of the processing dimensions and surface roughness on the processing surface such as the groove surface of the processing groove of the work Enables precise processing.

Further, according to the present invention, in addition to the above-described cutting reaction force absorbing mechanism including the slits 28a to 28c for absorbing the variation of the cutting reaction force and the elastic deformation supporting points 29a to 29c inside the slits 28a to 28c. Since the mechanism for adjusting the mechanical rigidity including the screw holes 31 and the bolts 32 described above is provided, for example, when the depth and width of the processing groove with respect to the workpiece W differ depending on the type of the workpiece, or when the workpiece material is used. When there is a change in the cutting conditions such as that there is a difference between a free-cutting type and a hard-cutting type, the conventional cutting tool is adapted to meet the respective cutting conditions by removing the entire tool from the chuck 8. According to the present invention, it is not necessary to replace the entire cutting tool 10 as long as the same cutting blade 40 can be used.
The operator can adjust to the change in the cutting condition only by adjusting the screwing amount of the bolt 32 or replacing only the bolt 32 with one having a different length.

Further, even in the process of progressing the same work W from the rough cutting stage to the precision cutting stage, the mechanical rigidity is set to be high in the rough cutting stage, and the same degree of precision cutting is performed. In the stage, if the cutting depth is reduced and the mechanical rigidity is also reduced, it is possible to cover all the machining steps with a single cutting tool 10.

FIGS. 3 and 4 show a cutting tool 10 according to the present invention.
14 shows another embodiment of the present invention. In this embodiment, a plurality of inclined slits 28a to 28 are formed in the cutting blade holding portion 24 of the shank 20 of the cutting tool 10 in the first embodiment described above.
A reaction force absorbing mechanism that absorbs and suppresses the variation of the cutting reaction force, which is configured by providing the elastic deformation fulcrum 29a to 29c at the inner side, and the inclined slits thereof are blocked by the bolt 32 to change the elastic deformation performance. Therefore, unlike the structure in which the mechanical rigidity in the upper region of the cutting blade 40 is adjusted, the single inclined slit 58 allows the inner deep point position 5 to be adjusted.
9 is formed as an elastic deformation fulcrum, and means is provided for changing the elastic deformation performance of this one inclined slit 58 to adjust the degree of mechanical rigidity.

That is, in this embodiment, a relatively large-diameter cylindrical hole 60 is formed in the region above the cutting blade 40 held by the cutting blade holding portion 24 so as to intersect with the above-mentioned inclined slit 58. Further, a screw hole 62 concentric with the cylindrical hole 60 is drilled from the bottom of the cylindrical hole 60 toward the side surface of the cutting blade holding portion 24, and an elastic material such as various synthetic materials is provided in the former cylindrical hole 60. An elastic ring body 61 made of a rubber material or the like is loaded,
The elastic ring body 61 is fixed to the bottom of the cylindrical hole 60 with a bolt 63. At this time, the cylindrical hole 60
Is formed as a hole that intersects with the inclined slit 58 and extends therethrough and extends inward, so that the inner end face of the elastic ring body 61 is obviously disposed across the inclined slit 58. I have. Moreover, when the elastic ring body 61 is tightened by the bolt 63, the elastic ring body 61 expands in the radially enlarged direction as shown in FIG. As a result, the elastic ring body 61 is pressed against the wall surface of the cylindrical hole 60 and the pressing force is reduced by the bolt screw 6.
3 is adjusted according to the tightening force. As described above, when the elastic ring body 61 expands and presses against the hole wall surface, the upper side and the lower side mechanically separated by the inclined slit 58 in the cutting blade holder 24 change the degree of mechanical coupling. As a result, the elastic deformation performance of the lower side deforming with the elastic deformation fulcrum 59 as a fulcrum changes with each cutting operation. As a result, the mechanical rigidity in the upper region of the cutting blade 40 can be adjusted.

When the operation of the elastic ring body 61 is examined in more detail, when the cutting process progresses while being pressed against the wall surface of the cylindrical hole 60, the elastic ring body 61
The cutting blade holder 24 is elastically deformed in a frictionally engaged state with the wall surface of the cylindrical hole 60. Therefore, this elastic ring body 6
1 is a process in which a region above the cutting blade 40 in the cutting blade holding unit 24 absorbs a reaction force fluctuation by elastic deformation according to a cutting reaction force with the elastic deformation fulcrum 59 as a fulcrum, and a vibration component during the elastic deformation operation. It also exhibits damping performance that attenuates noise.

As described above, according to the present embodiment, when the cutting tool 10 performs the cutting process, when the cutting conditions including the change of the work material change, the elastic ring 61 is inserted into the cylindrical hole 60. By adjusting the tightening amount of the bolt 63 to be fixed to the bottom of the hole, the mechanical rigidity in the upper region of the cutting blade 40 can be easily adjusted, and at the same time, the vibration component due to the cutting reaction force. Can be attenuated.
The cutting process can be more stabilized.
That is, the second embodiment is different from the first embodiment in that the mechanical rigidity adjusting means of the cutting tool including the cylindrical hole 60, the elastic ring body 61, and the bolt screw 63 also exerts vibration damping performance. Are different.

However, in the first embodiment, if necessary, an elastic plate such as a synthetic rubber thin plate is appropriately interposed and disposed in the plurality of slits 28a, etc., as required. It is also possible to maintain the same vibration suppression performance.

The other structural parts of the second embodiment, for example, the mounting structure of the cutting blade and the like are the same as those of the above-described first embodiment. A description of the configuration and operation will be omitted.

[0031]

As is apparent from the above description of the embodiment, according to the present invention, as a cutting tool mounted on a machine tool capable of C-axis control and performing a cutting process on a work surface,
A cutting tool of a hail bite type with a slit that forms an elastic deformation fulcrum in the upper region of the cutting blade is configured to absorb and suppress the variation in the cutting reaction force, and at the same time, elastically deform by interposing a block means in the slit. By adjusting the performance and adjusting the mechanical rigidity of the cutting blade holder in the area above the cutting blade, the cutting process can be performed each time the cutting conditions change in the process of cutting the workpiece. Eliminating the complexity of exchanging tools and simply allowing the operator to manually adjust from the side of the cutting tool, it became possible to respond to changes in cutting conditions with a single cutting tool. It is.

Further, when the means for adjusting the mechanical rigidity is provided with an elastic ring body, it is possible to attenuate and dampen the vibrations of the cutting blade holder and the cutting blade itself generated during cutting. This makes it possible to further stabilize the cutting action by the hale bite cutting tool.

[Brief description of the drawings]

FIG. 1 is a sectional front view showing a state in which a cutting tool according to a first embodiment of the present invention is mounted in a tool mounting hole of a machine.

FIG. 2 is a view showing a cross section taken along line 2-2 of FIG. 1;

FIG. 3 is a sectional front view showing a state in which a cutting tool according to a second embodiment of the present invention is mounted in a tool mounting hole of a machine.

FIG. 4 is a diagram showing a configuration of an elastic ring body of the embodiment shown in FIG.

FIG. 5 is a perspective view showing a configuration of a machine tool on which the cutting tool according to the present invention is mounted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 8 ... Chuck 9 ... Tool mounting hole 10 ... Cutting tool 20 ... Shank 22 ... Mounting part 24 ... Cutting blade holding part 26 ... Cutting blade mounting surface 28a-28c ... Slit 29a-29c ... Inner depth position 31 ... Screw hole 32 ... Bolt Reference Signs List 40 cutting blade 46 cutting edge 58 slit 59 inner depth position 60 cylindrical hole 61 elastic ring body 62 screw hole 63 bolt

Claims (2)

(57) [Claims] A shank comprising: a mounting portion held by a tool holding portion of a machine; and a cutting blade holding portion extending from the mounting portion to a distal end side; The mounted cutting blade, is cut obliquely from the lateral surface of the cutting blade holding portion of the shank to the axial direction of the mounting portion, and is arranged in parallel to each other to an inner depth position of a predetermined depth. A plurality of slits having the inner depth position as a fulcrum of elastic deformation; and a plurality of slits intersecting with the plurality of slits, and penetrating through the screw holes cut into the cutting blade holding portion of the shank and the screw holes. A rigidity adjusting means comprising: a screw that is screwed in and screwed in from the outside of the cutting blade holding portion and advanced and retracted to suppress an elastic deformation function of a slit selected from the plurality of slits. A cutting tool, characterized in that: 2. A shank comprising: a mounting portion held by a tool holding portion of a machine; and a cutting blade holding portion extending from the mounting portion to a distal end side; A mounted cutting blade, one slit cut obliquely from a lateral side surface of the cutting blade holding portion of the shank with respect to an axial direction of the mounting portion, and a hole formed in the shank intersecting with the slit. Is attached to the cutting blade holding portion of the shank with a bolt and elastically expands radially in accordance with the fastening force of the bolt to generate a pressing force on the inner wall of the hole. A cutting tool characterized by comprising: a rigidity adjusting means having a ring.