JP2001315014A - Cutting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and inexpensively embody regrinding a cutter chip and reducing the cost for replacing the cutter chip in a cutting tool. SOLUTION: As a cutter unit 2 formed by supporting the cutter chip 4 on a cuter supporting member 3, is mountably and demountably fastened and fixed to a cutter fastening part 13 formed on a rotated and driven cutter holder 1, the cutter chip 4 can be reground only by demounting the cutter unit 2 from the cutter holder 1 to set only the cutter unit on a predetermined position of a grinder in regrinding the cutter chip 4, and further as the shape of a set part is simple and compact, the cutter unit can be easily set on the grinder with an universal jig of a simple structure, which improves the workability in the setting work, and reduces the installation cost of the grinder. Further the fine adjustment of relative positions of the cutter chip 4 and a grinding wheel can be easily executed with high accuracy, which improves the grinding accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting tool having a blade holder detachably mounted on a blade holder.

[0002]

BACKGROUND OF THE INVENTION FIG. 7 shows a cutting tool Z ₀ of a conventional common groove machining. The cutting tool Z ₀ is gripped by an appropriate driving mechanism (not shown) and is rotatably driven in a predetermined direction. A blade holder 51 is formed by integrally forming a main body 52 provided with a pair of blade mounting tables 54 in the extended state. On the pair of blade mounts 54, 54 of the blade holder 51, substantially rectangular plate-shaped blade tips 55, 55 are fixed by brazing, respectively. In the cutting tool Z ₀ , the blade holder 5
The pair of blade tips 5 is driven by rotating the pair of blade tips 5.
The workpiece is cut by the cutting edge portions 55a and 55a.

[0003]

The cutting tool Z
_{In the case of 0} , since the cutting edge 55a of the blade tip 55 gradually wears due to long-term use and its sharpness decreases, it is necessary to re-polish the blade tip 55 in order to recover the sharpness. , The blade tip 55
The rake face 55b is polished as uniformly as possible by a predetermined thickness.

However, in the conventional cutting tool Z ₀ , the blade tip 55 is brazed and fixed to the blade mounting table 54 of the blade holder 51 and integrated therewith, so that the blade tip 55 is polished again. Sometimes the cutting tool Z ₀ itself is set in the polishing device,
In this case, the shape of the cutting tool Z ₀ is complicated because the cutting tool Z ₀ has an integral structure.
There is a problem that a dedicated jig corresponding to the shape of ₀ is required, and the equipment cost of the polishing apparatus is high.

[0005] In re-grinding, the rake angle (ie, the angle between the rake face 55b and the rotation axis) and the clearance angle (ie, the clearance face 55c) of the blade tip 55 in the cutting tool Z ₀ after the re-grinding are determined. to maintain the axis of rotation angle) and regrinding the previous proper conditions, it is necessary to finely adjust the relative position with respect to the grinding wheel of the blade material chip 55, where, in the state set with the entire cutting tool Z ₀ Since the fine adjustment must be performed, the operation is difficult to perform. In particular, in the case where a plurality of blade tips 55 are provided, it is necessary to individually perform the fine adjustment work for each of the blade tips 55 and 55. Thus, the above problem was even more remarkable.

Further, since the thickness of the blade tip 55 is reduced by re-polishing, if the re-polishing is repeated several times, the blade tip 55 can no longer be used and must be replaced with a new one. In this case, since the shape of the blade mounting table 54 of the blade holder 51 is set so as to correspond to the shape of the blade tip 55 attached thereto, the blade tip before replacement is the same as the blade tip after replacement. There is no problem in the case of the shape, but if the shape of the blade tip before replacement is different from the shape of the blade tip after replacement, it is necessary to change the shape of the main body 52 according to the shape. Depending on the shape change processing of the main body 52, it is not possible to cope with it, and it may be necessary to replace the entire blade holder 51 with a shape corresponding to the shape of the blade tip 55 after replacement,
There is also a problem that the replacement cost of the blade tip 55 is high.

SUMMARY OF THE INVENTION The present invention has been made to provide a cutting tool that can easily and inexpensively re-polish a blade tip and that can replace or reduce the cost of the blade tip.

[0008]

Means for Solving the Problems In the present invention, the following configuration is adopted as specific means for solving such problems.

In the cutting tool according to the first invention of the present application,
The blade unit 2 in which the blade tip 4 is supported by the blade support member 3 is detachably fastened and fixed to a blade fastening portion 13 provided in the blade holder 1 which is driven to rotate. I have.

In a second aspect of the present invention, in the cutting tool according to the first aspect, the blade unit 2 is configured such that the blade tip 4 is detachably attached to the blade support member 3. Features.

In a third aspect of the present invention, in the cutting tool according to the first aspect, the blade unit 2 is configured such that the blade tip 4 is fixed to the blade support member 3 and these are integrated. Features.

According to a fourth aspect of the present invention, in the cutting tool according to the first, second or third aspect, the blade holder 1 is provided with a pair of the blade fastening portions 13 and the pair of blade fastening portions. The blade unit 2 is removably fastened and fixed to the parts 13 and 13 respectively.

According to a fifth aspect of the present invention, in the cutting tool according to the fourth aspect, the pair of blade fastening portions 13, 13 of the blade holder 1 are held with the rotation axis of the blade holder 1 interposed therebetween. It is characterized by being arranged oppositely.

According to a sixth aspect of the present invention, in the cutting tool according to the fourth aspect, the pair of blade fastening portions 13, 13 of the blade holder 1 are held with the rotation axis of the blade holder 1 interposed therebetween. It is characterized in that it is arranged in an extended state on both sides in the radial direction.

[0015]

According to the present invention, the following effects can be obtained by adopting such a configuration.

In the cutting tool according to the first aspect of the present invention, the blade unit 2 having the blade support member 3 supporting the blade tip 4 is attached to the blade fastening portion 13 provided in the rotary driven blade holder 1. It is detachably fastened and fixed.

Therefore, according to the cutting tool of the present invention, (a) When the blade tip 4 is reground, the blade unit 2 may be removed from the blade holder 1 and only the blade unit 2 may be set at a predetermined position of the polishing apparatus. Therefore, compared to, for example, the case where the entire cutting tool is set as in the conventional case, the shape of the set portion is simpler and more compact, so that the setting to the polishing apparatus is easier and the structure is simple and general-purpose. It can be performed using a jig, so that the workability in the setting operation is improved and the equipment cost of the polishing apparatus is reduced. (B) The relative position between the blade tip 4 and the grindstone when the blade tip 4 is re-ground. When fine adjustment is made, the blade unit 2 may be removed from the blade holder 1 and the relative position of the blade unit 2 with respect to the grindstone may be adjusted. Compared to the conventional case where the relative position is finely adjusted between the entire cutting tool and the grindstone, the fine adjustment operation can be performed easily and with high accuracy, and the improvement of the polishing accuracy can be expected.

(C) If the amount of polishing of the blade tip 4 increases due to re-polishing, and it becomes impossible to grind and use the same, the blade tip 4
Must be replaced with a new one. In this case, the blade holder 1 is reused and the blade unit 2 is reused.
It is sufficient to replace only the cutting tool. For example, as compared with a case where the entire cutting tool is replaced as in the case of a conventional integrated cutting tool, the replacement cost can be reduced because the blade holder 1 can be reused. Further, a further reduction in the equipment cost of the polishing apparatus can be expected.

(D) When a plurality of types of blade tips 4 having different shapes are prepared and these are selected and used, a plurality of types of blade tips 4 are provided.
A plurality of blade units 2 each of which is supported by a blade support member 3 may be prepared, and the plurality of types of blade units 2 may be selectively attached to the blade holder 1. The holder 1 can be used in common. For example, as compared with a case where a dedicated tool holder is required for each shape of a tool tip as in a conventional integrated cutting tool, the number of equipments of the tool holder 1 is reduced. Therefore, equipment costs can be reduced accordingly.

According to the cutting tool according to the second invention of the present application, in the cutting tool according to the first invention, the blade unit 2 is detachably attached to the blade tip 4 with respect to the blade tip 4. Since the blade tip 4 is detached from the blade unit 2 and the blade tip 4 can be set in a single state and the position can be fine-adjusted since the blade tip 4 is attached, the above-mentioned (a) and (b) can be performed. The effects described are more remarkable.

When the blade tip 4 is replaced, only the blade tip 4 is replaced, and the blade support member 3 and the blade holder 1 can be reused as they are. Is more remarkable.

Further, it goes without saying that the effect described in the above (d) can also be obtained.

According to the cutting tool of the third aspect of the present invention, the following specific effects can be obtained in addition to the effects described above. That is, in the cutting tool according to the present invention, in the cutting tool according to the first aspect, the blade unit 2 is configured by fixing the blade tip 4 to the blade support member 3 and integrating them. For example, even if re-polishing of the blade tip 4 is repeated several times to reduce the thickness of the blade tip 4, the blade tip 4 is integrated with the blade support member 3 so that the blade support member 3 The rigidity of the blade tip 4 maintains the supporting rigidity during polishing or the strength during cutting work, and as a result,
By increasing the number of times that the blade tip 4 can be re-polished, the service life of the blade tip 4 can be lengthened, which is economical.

According to the cutting tool according to the fourth invention of the present application, in the cutting tool according to the first, second or third invention, the blade fastening portion 13 is attached to the blade holder 1.
And a pair of blade fastening portions 13, 13
The blade units 2 are detachably fastened and fixed to each other, so that each of the blade units 2, 2 is removed from each of the pair of blade fastening portions 13, 13, and set at a predetermined polishing position. The blade holder 1
Although it is a configuration provided with a pair of the blade fastening portions 13 described above,
The blade tips 4, 4 provided in each of these blade units 2, 2 can be polished simultaneously by a single polishing operation. For example, like the conventional integrated cutting tool, a set is set for each of the blade tips. The setting operation or the polishing operation is simplified as compared with the case where the operation and the polishing operation need to be performed, and the effect described above or above becomes more remarkable.

According to the cutting tool according to the fifth invention of the present application, in the cutting tool according to the fourth invention, the pair of blade fastening portions 13, 13 of the blade holder 1 are provided.
Are arranged opposite to each other with the rotation axis of the blade holder 1 interposed therebetween, so that the cutting tool is particularly suitable for a cutting tool in which the diameter of the trajectory of the blade tip 4 is small. The effects described above can be reliably obtained in a tool.

According to the cutting tool of the sixth aspect of the present invention, in the cutting tool of the fourth aspect, the pair of blade fastening portions 13, 13 of the blade holder 1 is provided.
Are arranged so as to extend to both sides in the radial direction with the rotation axis of the blade holder 1 interposed therebetween, so that it is particularly suitable for a cutting tool having a large diameter dimension of the cutting edge locus of the blade tips 4 and 4. It is a structure and the cutting tool of such a structure can reliably obtain the effects described above.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a cutting tool according to the present invention will be specifically described based on preferred embodiments.

First Embodiment FIG. 1 shows a cutting tool Z1 according to a _first embodiment of the present invention. Cutting tool Z ₁ of this embodiment is constituted by a blade holder 1 and a pair of cutter units 2 and 2 described next.

The blade holder 1 is provided with a shank portion 12 which is gripped and rotated by a suitable rotation driving means (not shown), and a tip end side of the shank portion 12 with respect to a rotation axis L of the shank portion 12. The main body 11 is provided integrally with a body 11 provided with a pair of left and right blade fastening portions 13, 13 extending to both sides in the radial direction.

The pair of blade fastening portions 13 in the main body 11 are formed as inclined planes that are inclined so as to approach the rotation axis L toward the tip end of the shank portion 12. A stopper 14 is provided which extends over the edge of the blade fastening portion 13 near the rotation axis L and the lower edge so as to bend in a substantially L-shape. Further, a pair of screw holes 23 are formed in the blade fastening portion 13 at predetermined intervals.

The blade unit 2 is provided with a blade support member 3 and a blade tip 4 described below. The blade support member 3 has a width substantially equal to the width of the blade fastening portion 13 and a rectangular thick plate having a height larger by a predetermined dimension than the height of the blade fastening portion 13. The upper surface is provided with a blade mounting surface 5 which is a flat surface one step lower than the surface. When the blade support member 3 is brought into contact with the blade fastening portion 13 of the blade holder 1, the screw holes 23, 23
, Insertion holes 25, 25, and a screw hole 24 at a portion extending upward from the blade fastening portion 13,
Each is provided.

The blade tip 4 is integrally formed of a rectangular plate-like body. A cutting edge 4a is provided on one of the long sides of the pair of cutting edges, and a surface continuous with the cutting edge of the cutting edge 4a is raked. In addition to the surface 4b, the surface opposite to the rake surface 4b is defined as an abutment surface 4c. The blade tip 4 has a fitting hole 2 at a position corresponding to the screw hole 24 when the blade tip 4 is brought into contact with the blade mounting surface 5 of the blade support member 3.
6 are provided.

The cutting tool Z ₁ is constructed by firstly arranging the blade chips 4 on the blade mounting surface 5 of the blade support member 3 and affixing them with fixing bolts 22 to form the blade unit 2. Further, the pair of blade units 2 and 2 configured as described above are brought into abutment with the respective blade fastening portions 13 and 13 of the blade holder 1 in a state of being positioned by the stopper 14, and these two are paired. By fixing with the fixing bolts 21 and 21 of FIG. Then, in the cutting tool Z _1, by said edge holder 1 is rotated, each blade unit 2,2
Cutting edge 4 of the above-mentioned blade tip 4, 4 provided respectively in
The workpiece is cut by a and 4a.

By the way, in this cutting tool Z ₁ ,
If necessary, it is necessary to re-polish the blade tip 4 to recover its sharpness. When re-polishing the blade tip 4, the blade units 2 and 2 are removed from the blade holder 1 side. And the blade support member 3
The blade tip 4 is removed from the above. Then, each of the blade tips 4, 4 in a single piece state is placed on the table of the polishing apparatus with the rake face 4b facing upward. In this state, the rake faces 4b, 4b of these two blade tips 4, 4 are simultaneously polished by a grindstone.

[0035] Thus, in this cutting tool Z _1, as described above, at the time of re-polishing of the blade tip 4,4 remove the blade unit 2 from said edge holder 1, further the blade material units 2 of the tool support member Since the blade tip 4 is detached from 3 and only the blade tips 4 and 4 are set at a predetermined position of the polishing apparatus, for example, when the entire cutting tool is integrally set in the polishing apparatus as in the related art, In comparison, the shape of the set portion is simpler and more compact, and as a result, the setting to the polishing device can be performed more easily and using a general-purpose jig having a simple structure. Thus, the polishing performance can be improved and the equipment cost of the polishing apparatus can be reduced.

When the blade tip 4 is polished with a grindstone, fine adjustment of the relative position between the blade tip 4 and the grindstone is necessary. In this case, too, the relative position of the blade tip 4 alone with respect to the grindstone is required. Since fine adjustment is performed, fine adjustment work can be performed easily and accurately compared to the case where fine adjustment of the relative position is performed between the entire cutting tool and the grindstone as in the related art. An improvement in polishing accuracy can be expected.

Further, when the blade tip 4 needs to be replaced, only the blade tip 4 is replaced, and the blade support member 3 and the blade holder 1 can reuse these as they are. For example, compared with the case where the entire cutting tool needs to be replaced like a conventional integrated cutting tool, the replacement cost can be reduced by the reuse of the blade holder 1 and the blade support member 3. it can.

By the way, in the cutting tool Z ₁ of this embodiment, tool tip 4 as described above and the cutter supporting member 3
And the blade unit 2 is configured, and the blade unit 2 is attached to and detached from the blade holder 1.
For example, when using a blade tip 4 having a different shape,
There is an advantage that facility cost can be reduced by sharing the blade holder 1.

[0039] That is, outside the blade tip 4 of the rectangular shape as shown in FIG. 1, for example, those cutting edge 4a as shown in FIG. 2 is composed of a straight portion 4a ₁ and the convexly curved portion 4a ₂ And,
When the cutting edge 4a, as shown in FIG. 3 is selected and used those composed of a straight portion 4a ₁ and the concave arc portion 4a ₂ are different with each blade tip 4 of these shapes, the respective blade tip 4 Each of the convex arc portions 31 (FIG.
Or a plurality of types of blade units 2 prepared by combining the blade tips 4 and the blade support members 3 having different shapes each having a concave arc portion (see FIG. 3).
And the plurality of types of blade units 2 may be selectively mounted on the blade holder 1 side. Therefore, the selective use of a plurality of types of blade tips 4 having different shapes can be realized by the blade holder 1 having the same shape. For example, when it is necessary to prepare a dedicated blade holder for each of the different shapes of blade tips. In comparison, the blade holder 1
Therefore, equipment costs can be reduced as much as the number of equipment can be reduced.

Second Embodiment FIG. 4 shows a cutting tool Z2 according to a _second embodiment of the present invention. Cutting tool Z ₂ of this embodiment, the first be those having the same basic configuration as the cutting tool Z ₁ embodiment, the embodiment of the first cutting tool Z ₁ is different from the above Only the configuration of the blade unit 2 is provided. That is,
In the first embodiment, whereas it constituted the said edge unit 2 by removably attaching the blade tip 4 to the tool support member 3, in the cutting tool Z ₂ in this embodiment The point is that the blade unit 2 is constituted by fixing and integrating the blade tip 4 with the blade mounting surface 5 of the blade support member 3 by brazing.

Therefore, in the cutting tool Z ₂ of this embodiment, the effect of the cutting tool Z ₁ of the first embodiment described above is of course obtained, and in addition, The effect of the present invention is also obtained. That is, the cutting tool Z ₂ in this embodiment, for example, the blade material chip 4 by regrinding said edge chip 4 is repeated several times
Even when the thickness of the blade tip 4 is reduced, since the blade tip 4 is integrated with the blade support member 3, the rigidity of the blade support member 3 causes the support rigidity or the cutting of the blade tip 4 during polishing. The strength during the operation is maintained, and as a result, the useful life of the blade tip 4 can be extended due to an increase in the number of times that the blade tip 4 can be re-polished, which is economical.

[0042] The configuration and effects other than the above is the same as that of the cutting tool Z ₁ of the first embodiment, here by incorporated the corresponding description of the first embodiment Is omitted.

Third Embodiment FIG. 5 shows a cutting tool Z3 according to a _third embodiment of the present invention. Cutting tool Z ₃ of this embodiment is constituted by a blade holder 1 and a pair of cutter units 2 and 2 described next.

The blade holder 1 has a shank portion 12 which is held and rotated by a suitable rotation driving means (not shown), and a rotation axis L of the shank portion 12 at the tip end side of the shank portion 12 having a diameter. The main body 11 is provided integrally with a pair of blade fastening portions 13, 13 opposed to each other in the direction.

The pair of blade fastening portions 13 in the main body portion 11 are formed by a squaring plane extending substantially parallel to the rotation axis L, and have one edge in the left-right direction. A stopper 14 is provided that extends in a substantially L-shape across the lower edge. Further, a pair of screw holes 23,
23 are formed.

The blade unit 2 includes a blade support member 3 and a blade tip 4 described below. The blade support member 3 includes a rectangular block-shaped base 3 a having substantially the same width and height as the blade fastening portion 13, and the base 3.
a and an extension 3b having a substantially arc-shaped cross-section extending continuously upward and integrally formed at the upper end of a.
The plane side of the extension 3b is a blade mounting surface 5. The blade support member 3 is fitted at a position corresponding to the screw holes 23 on the blade fastening portion 13 in a state where the base 3a is brought into contact with the blade fastening portion 13 of the blade holder 1. In addition to providing the insertion holes 25, 25,
A screw hole 24 is provided substantially at the center of b.

The blade tip 4 is integrally formed of a rectangular plate-like body, and has a cutting edge 4a provided on one side edge thereof, and a face continuous with the cutting edge of the cutting edge 4a is defined as a rake face 4b. In addition, a surface opposite to the rake surface 4b is defined as an abutment surface 4c. In the blade tip 4, when the blade tip 4 is abutted on the blade mounting surface 5 of the blade support member 3, a fitting hole formed of a horizontally elongated hole is provided at a position corresponding to the screw hole 24. 26 are provided.

In the cutting tool Z ₃ , first, the blade tip 4 is abutted on the blade mounting surface 5 of the blade support member 3, and these are fastened and fixed by the fixing bolts 22 to form the blade unit 2. Further, the pair of blade units 2 and 2 configured as described above are brought into abutment with the respective blade fastening portions 13 and 13 of the blade holder 1 in a state of being positioned by the stopper 14, and these two are paired. By fixing with the fixing bolts 21 and 21 of FIG. Then, in the cutting tool Z _3, that said edge holder 1 is rotated, each blade unit 2,2
Cutting edge 4 of the above-mentioned blade tip 4, 4 provided respectively in
The workpiece is cut by a and 4a.

By the way, in this cutting tool Z ₃ ,
If necessary, it is necessary to re-polish the blade tip 4 to recover its sharpness. When re-polishing the blade tip 4, the blade units 2 and 2 are removed from the blade holder 1 side. And the blade support member 3
The blade tip 4 is removed from the above. Then, each of the blade tips 4, 4 in a single piece state is placed on the table of the polishing apparatus with the rake face 4b facing upward. In this state, the rake faces 4b, 4b of these two blade tips 4, 4 are simultaneously polished by a grindstone.

Therefore, in the cutting tool Z ₃ , as described above, when the blade tips 4, 4 are reground, the blade unit 2 is removed from the blade holder 1, and the blade support member of the blade unit 2 is further removed. Since the blade tip 4 is detached from 3 and only the blade tips 4 and 4 are set at a predetermined position of the polishing apparatus, for example, when the entire cutting tool is integrally set in the polishing apparatus as in the related art, In comparison, the shape of the set portion is simpler and more compact, and as a result, the setting to the polishing device can be performed more easily and using a general-purpose jig having a simple structure. Thus, the polishing performance can be improved and the equipment cost of the polishing apparatus can be reduced.

When the blade tip 4 is polished with a grindstone, fine adjustment of the relative position between the blade tip 4 and the grindstone is necessary. In this case, too, the relative position of the blade tip 4 alone with respect to the grindstone is required. Since fine adjustment is performed, fine adjustment work can be performed easily and accurately compared to the case where fine adjustment of the relative position is performed between the entire cutting tool and the grindstone as in the related art. An improvement in polishing accuracy can be expected.

Further, when the blade tip 4 needs to be replaced, only the blade tip 4 is replaced, and the blade support member 3 and the blade holder 1 can reuse these as they are. For example, compared with the case where the entire cutting tool needs to be replaced like a conventional integrated cutting tool, the replacement cost can be reduced by the reuse of the blade holder 1 and the blade support member 3. You can do it.

Incidentally, the use of the blade holder 1 in the case of selectively using the blade tips 4 having different shapes and the accompanying effect of reducing the equipment cost are the same as in the case of the first embodiment.

Fourth Embodiment FIG. 6 shows a cutting tool Z4 according to a _fourth embodiment of the present invention. Cutting tool Z ₄ in this embodiment, the third be those having the same basic configuration as the cutting tool Z ₃ embodiment, differs from the cutting tool Z ₃ embodiment the third, the above Only the configuration of the blade unit 2 is provided. That is,
In the above-described third embodiment, whereas constituted the said edge unit 2 by removably attaching the blade tip 4 to the tool support member 3, in the cutting tool Z ₄ in this embodiment The point is that the blade unit 2 is constituted by fixing and integrating the blade tip 4 with the blade mounting surface 5 of the blade support member 3 by brazing.

[0055] Therefore, in the cutting tool Z ₄ in this embodiment, the third embodiment of the cutting that the operation and effect in the tool Z ₃ is obtained as well as the above description, in addition, specific as follows The effect of the present invention is also obtained. That is, the cutting tool Z ₄ in this embodiment, for example, the blade material chip 4 by regrinding said edge chip 4 is repeated several times
Even when the thickness of the blade tip 4 is reduced, since the blade tip 4 is integrated with the blade support member 3, the rigidity of the blade support member 3 causes the support rigidity or the cutting of the blade tip 4 during polishing. The strength during the operation is maintained, and as a result, the useful life of the blade tip 4 can be extended due to an increase in the number of times that the blade tip 4 can be re-polished, which is economical.

[0056] The configuration and effects other than the above is the same as that of the cutting tool Z ₃ of the third embodiment, where by aid of appropriate description of the embodiments of the third Is omitted.

[Brief description of the drawings]

FIG. 1 is a partially exploded perspective view of a cutting tool according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a modified example of a blade tip and a blade support member.

FIG. 3 is a perspective view showing a modified example of a blade tip and a blade support member.

FIG. 4 is a partially exploded perspective view of a cutting tool according to a second embodiment of the present invention.

FIG. 5 is a partially exploded perspective view of a cutting tool according to a third embodiment of the present invention.

FIG. 6 is a partially exploded perspective view of a cutting tool according to a fourth embodiment of the present invention.

FIG. 7 is a perspective view of a conventional cutting tool.

[Explanation of symbols]

1 is a blade holder, 2 is a blade unit, 3 is a blade support member, 4 is a blade tip, 5 is a blade mounting table, 6 is a shim, 11
Is a main body part, 12 is a shank part, 13 is a blade fastening part, 14
Is a stopper, 21 and 22 are fixing bolts, 23 and 2
4 the screw holes, 25 and 26 insertion hole, Z ₁ to Z ₄ is a cutting tool.

Claims (6)

[Claims] 1. A blade tip (4) on a blade support member (3).
The blade unit (2) supporting the blade holder (1) is removably fastened and fixed to a blade fastening portion (13) provided on the blade holder (1) driven to rotate. Cutting tools. 2. The cutting device according to claim 1, wherein the blade unit (2) is configured by detachably attaching the blade tip (4) to the blade support member (3). tool. 3. The cutting device according to claim 1, wherein the blade unit (2) is configured by fixing the blade tip (4) to the blade support member (3) and integrating them. tool. 4. The blade holder (1) according to claim 1, 2, or 3, wherein the blade holder (1) includes a pair of the blade fastening portions (13), and the pair of blade fastening portions (13), (1).
3) A cutting tool wherein the blade unit (2) is detachably fastened and fixed to each of the cutting tools. 5. The blade fastening portion (1) according to claim 4, wherein the pair of blade fastening portions (1) of the blade holder (1) is provided.
3) and (13), wherein the cutting tool is disposed to face the rotary axis of the blade holder (1). 6. The blade holder (1) according to claim 4, wherein said pair of blade fastening portions (1) of said blade holder (1) is provided.
3) and (13), wherein the cutting tool is disposed so as to extend to both sides in the radial direction with respect to the rotation axis of the blade holder (1).