JPH05177409A - Cutting tools - Google Patents

Abstract

(57) [Abstract] [Purpose] A hail bite type cutting tool that can adjust the mechanical rigidity of the upper region of the cutting blade according to the cutting conditions of the workpiece and can absorb and suppress the fluctuation of the cutting reaction force. Is provided. [Structure] Tool attachment hole 9 of chuck 8 for rotating main shaft of machine
It is fitted with the shaft center C aligned with the cutting edge holding part 2 at the tip.
4, the slits 28a to 28c are formed at predetermined portions above the elastic deformation fulcrums 29a to 29c to absorb the fluctuation of the cutting reaction force, and the slits 28a to 28c.
By blocking the elastic deformation performance by the forward and backward actions of the screw 32, the mechanical rigidity of the upper region of the cutting blade 40 can be adjusted to cope with changes in machining conditions.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention inserts into and mounts a tool mounting hole provided at the tip of a rotary spindle of a machine tool so as to perform a cutting action in a predetermined traveling direction and to rotate about a rotary shaft center. The structure of a cutting tool capable of changing the direction of the cutting blade by changing the direction of the cutting blade (hereinafter referred to as C-axis rotation) to change the cutting advancing direction, and in particular, the shank portion holding the cutting blade is It has at least one slit that forms a fulcrum for elastic deformation in order to prevent fluctuations in force and adverse effects such as galling and biting, and at the same time mechanical rigidity in the upper region of the cutting blade according to changes in machining conditions. Equipped with a rigidity adjustment means that can adjust and set the degree appropriately, it is possible to perform cutting processing that responds to changes in processing conditions with a single tool, and it is possible to form a precise processing surface from rough cutting of a workpiece. Cutting consistently related to that can be performed Hale byte-shaped cutting tools of up to.

[0002]

2. Description of the Related Art It is well known that a hail bite is used as a cutting tool in a machine tool, particularly a machine tool such as a lathe, a planing machine, a shaper, and the like. Types of thread cutting tools and the like are mainly well known. This type of hail bite is a cutting tool characterized in that it has a spring action portion bent in a U shape in the tool tip region near the cutting blade to prevent galling or biting during cutting action. In this type of conventional hail bite, the posture with respect to the work remains unchanged during processing, and the desired dimension can be machined by precisely determining the positional relationship between the cutting edge of the hail bite and the work before processing.

On the other hand, recently, there has been a demand for performing cutting such as grooving on a work having a flat surface to be processed by a milling machine tool. For example, in mold processing, simply
There is also a demand for precision machining of not only straight grooves but also grooves along closed curves. For such curved grooves, it has been common practice to use an end mill as a cutting tool.
In this end mill processing method, the tool itself has a rotation axis and performs cutting while rotating, so that 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 with a shape that matches the cross-sectional shape of the groove along a curved path relative to the workpiece, and the cutting edge is simply planed or die cut. Since it is not a linear trajectory as in the case of machining, it is necessary to give the cutting tool itself C-axis rotation that changes the traveling direction along with the curving of the movement trajectory. Therefore, even if the C-axis rotation function is added, the desired machining dimensional accuracy can be obtained, the machining cross section of the workpiece can be applied to both symmetrical and asymmetrical machining, and the workpiece has a fine finish surface roughness. As a result of the development and ingenuity to provide a cutting tool capable of mainly performing grooving, the present applicant has found that the elastic deformation fulcrum is used as a cutting tool that is mounted on a machine tool having a C-axis to perform cutting on the work surface Forming a hail bite type cutting tool having a slit formed in the upper region of the cutting blade, and the cutting tool has a shank having an axis coincident with the C axis, and the above-mentioned axis at the tip of the shank. A cutting blade having a desired shape is fixed to a mounting surface of the cutting blade formed as a plane including a predetermined fixing means, and the elastic deformation fulcrum is arranged in a front region of the mounting surface when viewed in a cutting advancing direction of the cutting blade. Installed to elastically absorb the cutting reaction force. By doing so, the cutting reaction force is suppressed within a certain fluctuation, and the cutting action is advanced by advancing the cutting blade relative to the workpiece along a predetermined trajectory while preventing galling and biting. At the same time, it is possible to select a cutting locus to be a curved locus by rotating the C-axis, and to provide a hail bite type cutting tool capable of cutting an arbitrary machining groove having a symmetrical or asymmetrical cross section on a work surface.

[0004]

However, the above-mentioned C
Even in the case of a cutting tool which has a curved locus processing performance by axial rotation and can cut an arbitrary processing groove having a symmetrical or asymmetrical cross section, structural improvement is still required. That is, if the processing conditions by this type of hail bite type cutting tool, for example, the width and depth dimensions of the groove to be machined on the work surface are changed between the works or the machinability of the work material is changed, With one cutting tool, even if various cutting blades are exchanged, the elastic deformation performance based on the elastic deformation fulcrum formed by the slits provided in the upper area of the cutting blade is uniform, so Rigidity is inevitably uniform, and there is a problem that proper cutting cannot be performed in some cases. That is, for example, when the machining groove of the workpiece is wide, the degree of mechanical rigidity of the cutting tool in the upper region of the cutting edge needs to be relatively large, while the groove depth is shallow and narrow groove cutting is performed. In machining, etc., it is necessary to have a large elastic deformation function and rather low mechanical rigidity, so prepare multiple cutting tools with different mechanical rigidity in advance and replace the tools according to changes in processing conditions. There is a need to do.

Similarly, with the above-described cutting tool having uniform mechanical rigidity, it is impossible to carry out the cutting work with a single cutting tool consistently from roughing to precision machining on the 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 with different mechanical rigidity in advance and replace them according to the progress of processing, which is troublesome. is there.

Therefore, an object of the present invention is to provide a means for simply adjusting the mechanical rigidity of a single hail bite type cutting tool while being mounted on the spindle of a machine tool in response 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 and adjusting the mechanical rigidity and absorbing the cutting edge vibration based on the cutting reaction force applied to the cutting blade during cutting. is there.

[0007]

According to the present invention, at least one slit is formed in the upper region of the cutting blade attached to the tip of the cutting blade holding portion in the shank of the cutting tool, and the innermost point thereof is formed. Formed on the elastic deformation fulcrum to configure cutting reaction force absorption means that elastically absorbs the cutting reaction force during cutting, and the elastic absorption performance of the cutting reaction force absorption means is mechanically applied from the outside of the cutting blade holding part. The cutting tool is configured so that the mechanical rigidity in the upper region of the cutting blade can be adjusted by adjusting the cutting tool.

That is, according to the present invention, a shank composed of a mounting portion held by a tool holding portion of a machine, a cutting blade holding portion extending from the mounting portion to a tip side, and a tip of the cutting blade holding portion. A cutting blade attached to the cutting blade, at least one slit formed in the upper region of the cutting blade so as to intersect with the axial direction of the mounting portion, and provided on the cutting blade holding portion of the shank, A cutting tool characterized by comprising rigidity adjusting means for adjusting and setting the mechanical rigidity of the upper region of the cutting blade to an appropriate level.

[0009]

According to the cutting tool of the present invention, the mechanical rigidity of the cutting blade holding portion of the shank holding the cutting blade in the upper region of the cutting blade is adjusted from the outside of the shank by the forward, backward movement or tightening adjustment operation of the bolt. It can be easily adjusted by manual adjustment operation, and therefore, when the shape and dimensions of the processed part such as grooves formed in the work change, when the work material is changed, or when the rough cutting process to the precision cutting process is performed. Even if there are changes in cutting conditions, including changes in conditions such as when the process changes, the operator adjusts the mechanical rigidity of the cutting tool with the cutting tool still attached to the spindle of the machine tool. By imparting a proper level of mechanical rigidity to the cutting blade holding portion in the upper region of the cutting blade, it is possible to perform appropriate cutting processing with a single tool in response to changes in cutting processing conditions.
Further, when the elastic ring is used as the mechanical rigidity adjusting means, the elastic ring can be pressed and arranged in the slit forming the elastic deformation fulcrum to have a vibration damping function. By absorbing the vibration at the time, the surface accuracy of the cut surface can be improved.

In the cutting tool of the present invention, when the cutting blade advances along a predetermined locus relative to the workpiece, a cutting groove having a symmetrical or asymmetrical sectional shape according to the shape of the cutting blade is formed. It goes without saying that the work surface can be abraded and the cutting blade can follow the curved trajectory along the C-axis rotation. And, the cutting reaction force acting on the cutting blade, in the region in front of the cutting blade mounting surface of the shank,
The spring elastic action of the shank at the elastic deformation fulcrum formed by the slit always absorbs and suppresses to a constant reaction force level, and as a result, fluctuations in the cutting amount during cutting are suppressed, and the cutting blade is Stable cutting force is exhibited regardless of the quantity, as is the case with the already proposed cutting tool. Hereinafter, the present invention will be described in more detail based on the embodiments shown in the accompanying drawings.

[0011]

FIG. 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.
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 action of the elastic ring body of the embodiment of FIG. 3, and FIG. 5 is a machine tool to which the cutting tool is mounted. It is a schematic perspective view.

1 and 2, a cutting tool 10 according to the present invention has a tool mounting hole 9 of a chuck 8 provided at the tip of a rotary spindle of a machine tool, and has a shaft center at a C-axis rotation center "C" of the spindle. And the workpiece (not shown) are moved relative to each other along a desired straight line or curved locus to form a tool for cutting, and the shank 20, the cutting blade 40, and the shank 20 are formed. Further, a set screw 30 forming a fixing means for fixing the cutting blade 40 is provided.

The shank 20 is a round bar-shaped mounting portion 22 that is fitted and mounted in the mounting hole 9 of the chuck 8 without backlash, and an extension that extends downward from the position of the chuck end 8a of the mounting portion 22. Blade holding part 24 formed as a part
And a mounting hole 9 for the chuck 8 is provided in the mounting portion 22.
Further, a screw seat 25 is formed so as to be firmly fixed by the appropriate number of lock screws 18. And this mounting part 22
When it is firmly fixed to the mounting hole 9 with the lock screw 32, is a cylindrical body having an axis centered on the rotation axis C.

On the other hand, the integrated cutting blade holding portion 24 extending downward from the mounting portion 22 is provided with a recessed 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 recessed portion from below, and the front surface 42 is brought into close contact with the mounting reference surface 26,
It is pressed from the rear surface 44 side by a set screw 30 as a fixing means and fixed to the cutting blade mounting surface 26. That is, the cutting blade 4
Reference numeral 0 has a flat plate shape, a cutting edge 46 having various blade shapes is provided at the lower end of the front surface 42, and a flank 47 is provided between the front surface 42 and the rear surface 44.

Now, 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, and therefore, the cutting blade mounting surface 26 contacts the cutting blade mounting surface 26. The front surface 42 of the cutting blade 40 in contact also has the same mounting surface 26.
When it comes into contact with, the front surface 42 comes to have an axis center.

Further, the cutting blade holding portion 24 has three slits 28a, 28b, 28c cut in a region above the cutting blade mounting surface 26 in a direction intersecting with the axis "C".
Inclines inward from the side surface of the cutting blade holding portion 24,
In addition, they are formed in a mutually parallel arrangement. That is, these slits 28a to 28c pass through the axial center C and reach 29
a predetermined gap dimension S and depth dimensions L1, L2, L3 (L1 <L2) cut to the inner depth positions indicated by a, 29b, and 29c.
<L3), and is provided as a kerf extending over the entire width of the shank 20, that is, a kerf penetrating in the direction perpendicular to the paper surface of FIG. 1. These inner positions 29a, 29
b and 29c are arranged on the front side of the cutting blade mounting surface 26 as viewed in the direction (arrow P) which advances relative to the work during the cutting action of the cutting blade 40, and the slit having such a depth. By providing 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 made deformable. That is, the cutting tool 10 of the present invention has a structure that functions as a tool having a spring action with the fulcrums 29a to 29c as deformation fulcrums, like the well-known hail bite.

According to the present invention, further, in the cutting blade holding portion 24 of the shank 20, the three slits 28a to 28c are commonly intersected with each other, and each slit 28 is formed.
A screw hole 31 having a predetermined screw size is provided so as to pass through a substantially central portion such as a in the width direction (see FIG. 2), and this screw hole 31 is, after all, a tap hole penetrating to another side surface. Is formed as. A bolt 32 is screwed into the screw hole 31. In addition, the length of the bolt 32 is shown in FIG. 1 as having a length that passes through the slit 28c provided at the uppermost portion, but if necessary, the slit 28c and the slit 28b in the central portion may be combined. You may engage a bolt of a length that passes through both,
The screw length may be selected and used so that the bolt 32 is engaged from the side opposite to that shown in the drawing and only the lowermost slit 28a is passed through. The point to be noted here is that the slit in which the bolt 32 is engaged in this way, for example,
In the slit 28c of FIG. 1, the bolt 32 has the same slit 2
A block action for suppressing the elastic deformation function with the inner back position 29c of 8c as a fulcrum is performed, and 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. This is a point that can be done. In this manner, the bolt 32 is used to block any one slit or any two slits in the three slits 28a to 28c, and the mechanical rigidity in the upper region of the cutting blade 40 is changed by the operator. Can be adjusted. Then, if this mechanical rigidity is adjusted, as described later,
It is possible to deal with changes in various cutting conditions with one cutting tool 10. The inner diameter of the screw hole 31, that is, the outer diameter of the screw of the bolt 32, is designed and selected in advance so that the mechanical rigidity can be remarkably adjusted when the slit 28a or the like intersects and the block acts. Needless to say.

On the other hand, the cutting edge 46 of the cutting edge 40 fixed to the cutting edge mounting surface 26 with the set screw 30 has a cutting edge shape according to various machining shapes, and the cutting edge 46 in the mounted state. , Is 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 proceeding direction P around an axis line that coincides with the axis C existing in the front surface 42. ing. The cutting blade 40 is the cutting edge 4
When the front surface 42 having 6 at the lower end abuts on the cutting blade mounting surface 26, the axis C existing in the reference mounting surface 26 is aligned with the center line defined by the shape of the cutting edge 46. It is formed so that it can be positioned in the left-right direction with respect to the traveling direction P. Further, the cutting blade 40 is the set screw 3 of the illustrated example.
Instead of the structure in which 0 is attached so as to be exchangeable, it may be a structure integrally fixed by brazing or the like.

Here, the overall construction of the machine tool to which the cutting tool 10 according to the first embodiment of the present invention is mounted will be briefly described. FIG. 5 is a mechanical diagram of a machine tool in which the cutting tool 10 of the present invention is mounted to perform cutting. W indicates a workpiece, which is a workpiece, and is mounted and fixed below the cutting tool 10 on a work table 52. It An X-axis and Y-axis feed mechanism 54 is provided below the column 53 of the machine tool.
The feed mechanism 54 has a cross guide surface structure so that the work table 52 on which the work W is mounted can be fed in the X-axis and Y-axis directions, and an X-axis feed motor 55 and a Y-axis feed motor 56 are provided respectively. attached.

A Z-axis feed mechanism 5 is provided above the column 53.
7, the Z-axis feed mechanism 57 has a guide structure capable of feeding the cutting tool 10 by cutting in the Z-axis direction, and has a Z-axis feed motor 58. A tool spindle head 59 is attached to a movable portion of the Z-axis feed mechanism 57, and the rotary tool spindle 7 described above is provided inside the tool spindle head 59. The cutting tool 10 is fitted and mounted in the tool mounting hole in the lower part of the rotary tool spindle 7 via the chuck 8, and the upper part of the rotary tool spindle 7 is C.
It is connected to the shaft drive motor 61.

The rotary tool main shaft 7 is rotatably supported around its axis, and this rotary feed shaft is referred to as the C-axis, and the rotation angle is controlled by the C-axis drive motor 61. .. This machine tool, based on the numerical control information given to the control device 62 composed of a numerical control device, these X-axis feed motor 55, Y-axis feed motor 5
6, a drive signal is appropriately issued to the Z-axis feed motor 58 and the C-axis drive motor 61 to drive the X-axis, Y-axis, Z-axis, and C-axis of the machine tool, and between the work W and the cutting tool 10. The workpiece W is relatively moved along a desired locus, and the work W is subjected to cutting such as grooving. As described above, in the conventional end mill, since the cutting edge of the tool rotates at high speed to perform the cutting action, the shape of the machining groove is limited to a symmetrical shape, but the cutting tool 10 of the present invention simply changes the cutting advancing direction. In order to do so, the C-axis is swiveled, and the cutting action is performed by the cutting edge 46 of the cutting edge 40 of the tool 10 traveling along the locus, so that asymmetrical shape machining can also be performed.

In addition, in the present invention, as described above, the cutting edge holding portion 24 of the shank 20 of the cutting tool 10 has the elastic deformation fulcrum similar to the hail bite with the inner positions 29a to 29c of the slits 28a to 28c as fulcrums. Since all of the positions 29a to 29c of the elastic deformation fulcrum are on the front side of the cutting blade 40 as viewed in the traveling direction P of the cutting action (see FIG. 1), the cutting reaction force during the cutting action is the slit. Integral elastic deformation of the cutting blade holding portion 24 and the cutting blade 40 is caused to expand or contract the gap width S such as 28a. Therefore, the relative positional relationship between the machining surface of the work W and the cutting edge 46 of the cutting blade 40 of the tool 10 changes due to vibrations transmitted from the machine side, and the cutting reaction force changes. However, the fluctuation reaction force is absorbed and suppressed by the elastic deformation of the lower region of the cutting blade holding portion 24 and the cutting blade 40 which is integrated.
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 of the cutting edge 46 of the cutting blade 40 biting or biting into the work. At the same time, the cutting depth does not fluctuate in the course of cutting. This means that the cutting amount of the cutting blade 40 in the Z-axis direction (direction normal to the workpiece) is, for example, 20.
It is also possible to carry out cutting without causing slippage by setting it to a small value of less than micron, and as a result, fine control of the machining dimension and surface roughness on the machined surface such as the groove surface of the workpiece groove It enables precise processing.

Further, according to the present invention, in addition to the cutting reaction force absorbing mechanism including the slits 28a to 28c for absorbing the variation of the cutting reaction force and the elastic deformation fulcrums 29a to 29c on the inner side of the slits 28a to 28c, in addition to the existing mechanism, Since the mechanical rigidity adjusting mechanism including the screw holes 31 and the bolts 32 described above is provided, for example, when the groove depth and the groove width of the machining groove with respect to the workpiece W differ depending on the type of the workpiece, or the workpiece material. When the cutting conditions such as those of free-cutting or difficult-to-cut differ, the conventional cutting tool was removed from the chuck 8 as a whole and adapted to the respective cutting conditions. Although it was necessary to replace it with one having mechanical rigidity, according to the present invention, as long as the same cutting blade 40 can be used, it is not necessary to replace the entire cutting tool 10, and each time,
It is possible for the operator to deal with the change in the cutting processing conditions by adjusting the screwing amount of the bolt 32 or exchanging only the bolt 32 with a different length.

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

3 and 4 show a cutting tool 10 according to the present invention.
7 shows another embodiment of the present invention. In this embodiment, in the first embodiment described above, a plurality of inclined slits 28a to 28a are provided in the cutting blade holding portion 24 of the shank 20 of the cutting tool 10.
28c and the elastic deformation fulcrums 29a to 29c on the inner side, the reaction force absorption mechanism configured to absorb and suppress the fluctuation of the cutting reaction force and the inclined slits thereof are blocked by the bolts 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 depth point position 5 to be increased.
9 is formed as an elastic deformation fulcrum, and means for adjusting the mechanical rigidity is adjusted by changing the elastic deformation performance of this one inclined slit 58.

That is, in this embodiment, a cylindrical hole 60 having a relatively large diameter is formed in the upper region of the cutting blade 40 held by the cutting blade holding portion 24 so as to intersect with the inclined slit 58. Further, a screw hole 62 concentric with the cylindrical hole 60 is bored from the bottom of the cylindrical hole 60 toward the side surface of the cutting blade holding portion 24, and the former cylindrical hole 60 is made of an elastic material such as various synthetic materials. An elastic ring body 61 formed 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 further extends inward through the inclined slit 58. Therefore, the inner end surface of the elastic ring body 61 is obviously disposed across the inclined slit 58. There is. Moreover, when the elastic ring 61 is tightened with the bolts 63, the elastic ring 61 expands in the radial direction as shown in FIG. As a result, the elastic ring body 61 has the cylindrical hole 6
It is pressed against the wall surface of hole 0 and the pressing force is
It is adjusted according to the tightening force. Thus, when the elastic ring body 61 is expanded and pressed against the wall surface of the hole, the mechanical coupling degree changes between the upper side and the lower side which are mechanically separated with the inclined slit 58 in the cutting blade holding portion 24 as a boundary. As a result, the elastic deformation performance of the lower side deforming with the elastic deformation fulcrum 59 as a fulcrum changes during the cutting process. As a result, the mechanical rigidity in the upper region of the cutting blade 40 can be adjusted.

When the action 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 holding portion 24 is elastically deformed while being in frictional engagement with the hole wall surface of the cylindrical hole 60. Therefore, this elastic ring body 6
1 is a process in which the upper region of the cutting blade 40 in the cutting blade holding unit 24 absorbs a reaction force variation due to elastic deformation according to the cutting reaction force with the elastic deformation fulcrum 59 as a fulcrum, and a vibration component during the elastic deformation operation. It also exhibits vibration damping performance that attenuates.

As described above, according to the present embodiment, when the cutting tool 10 carries out the cutting process and the cutting conditions including the change of the work material are changed, the elastic ring body 61 is moved to the cylindrical hole 60. The operator can easily adjust the mechanical rigidity in the upper region of the cutting blade 40 by adjusting the tightening amount of the bolt 63 fixed to the bottom of the hole, and at the same time, the vibration component due to the reaction force of the cutting process. It is also possible to damp, and therefore the hail bite type cutting tool 10
The cutting process can be further stabilized.
That is, in the second embodiment, the mechanical rigidity adjusting means of the cutting tool, which is composed of the cylindrical hole 60, the elastic ring body 61, and the bolt screw 63, also exhibits the vibration damping performance, compared to the first embodiment. It's different.

However, even 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 in the case of the second embodiment. It is also possible to maintain the same vibration damping performance.

Since 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 first embodiment described above, the respective elements are shown by the same reference numerals, and A description of the structure and operation will be omitted.

[0031]

As is apparent from the above description of the embodiments, according to the present invention, a cutting tool mounted on a machine tool capable of C-axis control to perform cutting on the surface of a work is
Elastic deformation is constructed by forming a hail bite type cutting tool with a slit that forms a fulcrum of fulcrum above the cutting blade, and absorbs and suppresses fluctuations in the reaction force of the cutting, while at the same time interposing block means in the slit. By adjusting the performance, it is possible to adjust the mechanical rigidity of the cutting blade holding part in the area above the cutting blade, so even if the cutting conditions change in the cutting process for the workpiece, the Eliminating the trouble of exchanging tools, it is possible for a single cutting tool to respond to changes in cutting conditions by allowing the operator to manually perform adjustment work from the side of the cutting tool. Of.

In addition, when the mechanical rigidity adjusting means is constructed by including the elastic ring body, the vibration of the cutting blade holding portion and the cutting blade itself generated during cutting can be damped and damped. Therefore, it is possible to further stabilize the cutting operation by the hail bite type cutting tool.

[Brief description of 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.

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 view showing a structure of an elastic ring body of the embodiment shown in FIG.

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

[Explanation 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 40 ... Cutting blade 46 ... Cutting edge 58 ... Slit 59 ... Inner back position 60 ... Cylindrical hole 61 ... Elastic ring body 62 ... Screw hole 63 ... Bolt

Claims (3)

[Claims] 1. A shank comprising a mounting portion held by a tool holding portion of a machine, a cutting blade holding portion extending from the mounting portion to a tip side, and a cutting attached to a tip of the cutting blade holding portion. A blade, at least one slit formed in the upper region of the cutting blade so as to intersect with the axial direction of the mounting portion, and provided in the cutting blade holding portion of the shank, in the upper region of the cutting blade. A cutting tool comprising: rigidity adjusting means for adjusting and setting mechanical rigidity to an appropriate level. 2. The slit is oblique from the lateral side surface of the cutting blade holding portion with respect to the axial direction of the mounting portion, and
Consisting of a plurality of slits cut in parallel arrangement with each other, the rigidity adjusting means intersects with the plurality of slits, and, through, a screw hole cut into the cutting blade holding portion,
The cutting tool according to claim 1, further comprising a bolt that is screwed into the screw hole and that is moved forward and backward from the outside of the cutting blade holding portion to block a selected number of slits from the plurality of slits. 3. The slit is composed of one slit cut obliquely from a lateral side surface of the cutting blade holding part with respect to an axial direction of the mounting part, and the rigidity adjusting means intersects with the slit. Elastically attached to the hole formed in the shank, fixed to the cutting blade holding portion with a bolt, and elastically expanded radially in accordance with the fastening force of the bolt to press against the inner wall of the hole. The cutting tool according to claim 1, comprising a ring.