JPH05277865A - Cutting tool - Google Patents

Abstract

PURPOSE:To realize a cutting tool with a high rigidity without sacrificing the cost aspect by composing a tool main body and a chucking shaft body with different members. CONSTITUTION:An end mill tool 61 has a chucking shaft body 62 in which a tool main body insertion hole 623 with a taper form is opened, and a tool main body 63 furnished with a shank 632 of a taper shank fixed to the tool main body insertion hole 623 with an adhesive layer 64, and a process solution feeding hole 66a opened toward an edge 631 of the tool main body 63 is formed on the border surface between a sleeve 627 and a sleeve housing hole 626.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting tool such as a solid end mill tool, and more particularly to a structure technology for a chucking portion and a tool body side.

[0002]

2. Description of the Related Art Generally, cutting tools such as end mill tools and drill tools are formed by processing a commercially available shaft body made of cemented carbide or high speed steel, and the base end side of the cutting machine body side. While the shank portion is formed so that it can be held by the holder or the like, the blade portion is formed on the tip side thereof. Here, like a solid end mill tool,
When a small-diameter blade is formed, the outer diameter of the shank is compared with the outer diameter of the blade in order to ensure high rigidity.
Generally, the structure is thickened by about 2 to 4 mm.

[0003]

However, since the conventional cutting tool is integrally formed by processing a commercially available shaft body, the shape of each part of the cutting tool is restricted by the dimensions of the shaft body, and the like. There is a problem that there is a limit to improving the strength and economical efficiency of the cutting tool. That is, since the outer diameter of the shank portion is limited to be equal to or smaller than the outer diameter of a commercially available shaft body, there is a limit in increasing the outer diameter of the shank portion and increasing the rigidity. On the other hand, if a cutting tool is formed from a shaft body with a large outer diameter for the purpose of increasing the outer diameter of the shank,
In addition to increasing the cost of the shaft itself, it takes a long processing time to form a blade having a small diameter, resulting in a significant increase in processing cost. Further, since the length dimension of commercially available shaft bodies is also restricted, if the amount of protrusion of the blade portion from the holder is increased, the length of the shank portion will be shortened as a result. For this reason, the chucking length becomes shorter,
The rigidity of the tool itself may be reduced, and the vibration transmitted from the tool during processing may damage the holder side.

In order to solve such a problem, the inventor of the present application constructed a tool body having a blade portion and a chucking shaft body serving as a chucking portion by separate members, and It is proposed to fix the shank portion on the tool body side inside the formed insertion hole to form a cutting tool. According to the tool having such a structure, the tool main body and the chucking shaft body can be configured into shapes corresponding to their respective functions without being restricted by the dimensions or the like on the other side. However, in the tool first devised by the inventor of the present application in accordance with this proposal, when fixing them, a set screw is screwed from the side surface portion of the chucking shaft body to insert the chucking shaft body. Since a structure for fixing the shank part of the internal tool body was adopted, there was a new problem that runout with respect to the shaft core caused a short tool life and a small holding force. Also, instead of this fixing structure, a fixing structure using a taper and a fixing structure in which the tool body is screwed from the base end side end surface of the chucking shaft were also examined, but with the former fixing structure, the holding force in the pulling direction is However, in the latter fixing structure, the processing cost for forming the screwing mechanism is high, and none of the fixing structures can be put to practical use.

In view of the above problems, the object of the present invention is to
Without causing problems in strength and cost,
By embodying the above-mentioned proposal, by fixing the tool main body and the chucking shaft body by using the fixing force of the adhesive material, mechanical strength such as rigidity can be obtained without sacrificing cost. It is to realize a cutting tool that can be improved.

[0006]

Means for Solving the Problems In order to solve the above-mentioned problems, the means taken in a cutting tool according to the present invention is a chucking shaft having a chucking portion on the outer peripheral side and a tool body insertion hole opening at the tip end surface. It has a body and a tool body having a blade portion on the tip end side and a shank portion on the base end side, and this tool body is the outer circumference of the shank portion fitted inside the tool body insertion hole of the chucking shaft body. It is fixed to the chucking shaft body by an adhesive layer formed between the surface and the inner peripheral surface of the tool body insertion hole. That is, the tool body and the chucking shaft are configured as separate members, and these are bonded and fixed to form a cutting tool.

Here, when the shack part on the tool body side is inserted into the tool body insertion hole on the chucking shaft side,
It is preferable to form a through hole in the chucking shaft body so as to penetrate from the end face on the proximal end side to the tool body insertion hole for the purpose of removing air from the insertion hole.

Further, the chucking shaft body has a sleeve accommodating hole opened at its tip end surface, and a tool body insertion hole formed inside by being inserted into the sleeve accommodating hole, the outer peripheral surface and the sleeve accommodating hole. A chucking shaft body formed at the boundary between the sleeve fixed by an adhesive layer formed between the inner peripheral surface and the outer peripheral surface of the sleeve or the inner peripheral surface of the sleeve housing hole. It is preferable to provide a machining liquid supply hole which is opened at the tip end surface of the above and communicates with the through hole. In this case, in order to efficiently supply the machining fluid to the blade portion of the tool body, the portion of the machining fluid supply hole on the tip surface side of the chucking shaft is formed toward the blade portion side of the tool body. It is preferable that

For the purpose of expanding the joint area between the shank portion on the tool body side and the tool body insertion hole on the chucking shaft body to improve the adhesive force, the tool body insertion hole is formed on the tip surface side of the chucking shaft body. It is preferable that the shank portion of the tool body is formed as a tapered shank corresponding to the taper of the tool body insertion hole while the inner diameter is expanded as a tapered hole.

[0010]

In the cutting tool according to the present invention having the above means, the shank portion of the tool body is inserted into the tool body insertion hole opened at the tip end surface of the chucking shaft,
An adhesive material layer is formed between the outer peripheral surface of the shank portion and the inner peripheral surface of the tool body insertion hole to firmly attach the chucking shaft body and the tool body, and the holder or the like chucks the chucking shaft body. Hold as a part. That is, in the cutting tool according to the present invention, the tool body and the chucking shaft body are separate members, and therefore, the tool body and the chucking shaft body have dimensional restrictions and the like when they are structured according to their functions. To the other side. Therefore, even if the tool body is formed from a shaft body of a small diameter cemented carbide or high-speed steel that corresponds to the outer diameter of the small-diameter blade part, and the material cost and processing cost are reduced, the tool body will have a small diameter. The mechanical strength such as rigidity is not sacrificed because it is not directly held via the shank portion but is held via the chucking shaft. On the contrary, without being restricted by the size of the tool body or the like, it is possible to increase the rigidity of the chucking shaft body side by making the chucking shaft body function correspondingly thicker. Further, it is also possible to extend the length of the tool body to increase the amount of protrusion of the blade portion from the holder without any trouble.

Further, since the tool body and the chucking shaft body are separate members, before fixing them, the inside of the tool body insertion hole of the chucking shaft body is processed, and the sleeve is attached to the chucking shaft body side. It is also easy to provide the cutting tool with a new function. For example, a sleeve is provided in the sleeve accommodating hole of the chucking shaft body, and a groove is formed on the outer peripheral surface of the sleeve or the inner peripheral surface of the sleeve accommodating hole. The groove secures the tool body and the chucking shaft body. It is also possible to form a machining liquid supply hole for supplying the cutting liquid or the like to the work side inside the finished cutting tool.

[0012]

Embodiments of the present invention will now be described with reference to the accompanying drawings.

[Embodiment 1] FIG. 1 is a sectional view showing the structure of an end mill tool (cutting tool) according to Embodiment 1 of the present invention.

In this figure, the end mill tool 1 of this example is shown.
Has a chucking portion 21 on the outer peripheral side thereof, and a chucking shaft body 2 made of steel having a high Young's modulus in which a straight tool body insertion hole 23 is opened in the tip end surface 22, and a blade portion 31 on the tip end side.
And a tool main body 3 having a shank portion 32 on the base end side thereof, and the chucking shaft body 2 and the tool main body 3 are formed as separate members, and then the shank portion is inserted into the tool main body insertion hole 23. In the state where 32 is fitted, the adhesive layer 4 made of a cyano-based instant adhesive is formed between the outer peripheral surface 32a of the shank portion 32 and the inner peripheral surface 23a of the tool body insertion hole 23, and the tool body 3 And the chucking shaft body 2 are in a fixed state. Here, the outer diameter dimension of the shank portion 32 is equal to the outer diameter dimension of the blade portion 31, but is several μ compared to the inner diameter dimension of the tool body insertion hole 23.
Since it is designed to be small by about m, the adhesive layer 4 can be sufficiently formed between them. Further, the chucking shaft body 2 is formed with a through hole 25 penetrating from the end face 24 on the proximal end side thereof to the tool body insertion hole 23, and when the shank portion 32 is fitted into the tool body insertion hole 23. Since the internal air escapes through the through hole 25, the shank portion 32 inserted into the tool body insertion hole 23 is prevented from being pushed out by the compressed air inside the tool body insertion hole 23. . Also,
It is also possible to insert a shaft or the like from the through hole 25 and push out the shank portion 32 inserted into the tool body insertion hole 23. Here, since the center line of the tool body insertion hole 23 is on the center axis 2a of the chucking shaft body 2, the rotation center lines of the blade portion 31 and the shank portion 32 of the tool body 3 are the center axis line of the chucking shaft body 2. 2a, and their concentricity is 0.002 mm or less. Therefore, the blade portion 31 rotates about the central axis line 2a of the chucking shaft body 2 as a rotation center line and is not in an eccentric state.
The machining accuracy for the workpiece is high, and the life of the tool body 3 is long. Furthermore, since the vibration transmitted from the tool body 3 is small, the tool body 3 is maintained in a state of being securely fixed to the chucking shaft body 2, and the holder (not shown) on the cutting device body side is also chucked. 2 is held in a stable state, and the holder side is not damaged.

An example of the manufacturing method and usage of the end mill tool 1 having such a configuration will be described below.

First, using a required processing machine, a shaft-shaped material having a predetermined outer diameter dimension is processed to form the chucking shaft body 2 and the tool body 3 as separate members.

Next, the shank portion 32 of the tool body 2 is fitted into the tool body insertion hole 23 of the chucking shaft body 2,
In this state, a cyano-based instant adhesive is injected between the outer peripheral surface 32a of the shank portion 32 and the inner peripheral surface 23a of the tool body insertion hole 23, and then cured to form the adhesive layer 4. Thereby, the tool body 3 is fixed to the chucking shaft body 2. At this time, while the tool body 3 is rotated with respect to the chucking shaft body 2, the adhesive is injected to align the shank portion 32 with the center of the tool body insertion hole 23 by utilizing the viscosity of the adhesive. You can also do it.

Then, the manufactured end mill tool 1 is set in the holder on the side of the cutting device through the chucking shaft body 2, and a working fluid such as cutting fluid is set to about 30 kgf / cm ^2.
The workpiece is processed while being supplied to the blade portion 31 of the tool body 3 with the above high pressure. Therefore, since the end mill tool 1 and the work are in a state of being cooled by the working fluid,
The adhesive strength of the adhesive layer 4 does not decrease.

As described above, in the end mill tool 1 of this example, the tool body 3 and the chucking shaft body 2 are separate members, and they have different functions. That is, since the end mill tool 1 is held via the chucking shaft body 2, the outer diameter dimension of the shank portion 32 does not affect the rigidity of the end mill tool 1. Therefore, the outer diameter of the shank portion 32 can be formed as a small diameter dimension matching the outer diameter of the blade portion 31, and it is not necessary to unnecessarily increase the thickness.
A thin shaft body such as cemented carbide or high speed steel for forming the tool body 3 is sufficient. Therefore, in addition to the low material cost, the processing amount is small, so that the processing cost is low and the end mill tool 1 can be manufactured at low cost. Further, it is possible to reduce the storage space of the tool body 3 and improve the transportation efficiency. On the other hand, the chucking shaft 2 is made thicker in accordance with its function and the rigidity thereof is increased, but the material cost and the processing cost of the end mill tool 1 are not significantly increased. Therefore, even if a plurality of end mill tools having different blade diameters are prepared, the cost is low. Further, since each member is fixed by using the adhesive layer 4, the end layer tool 1 having a concentric structure is easily manufactured, and the adhesive layer 4 exhibits a large fixing force, Depending on the type of the adhesive material and the like, the fixing force can be reduced by applying heat or dipping in a solvent, so that the tool body 3 can be easily removed from the chucking shaft body 2. Therefore, it is possible to prepare various types of tool bodies 3 having different blade diameters and exchange them for use. Also, the tool body 3
It is also possible to extend the length of the blade to lengthen the protruding amount of the blade portion 31 from the holder without any trouble.

[Embodiment 2] FIG. 2 is a sectional view showing the structure of an end mill tool (cutting tool) according to Embodiment 2 of the present invention. Since the configuration of the end mill tool of this example is substantially the same as the configuration of the end mill tool of the first embodiment, detailed description of common parts will be omitted.

In this figure, the end mill tool 1 of this example is shown.
1, the outer peripheral side is the chucking portion 121, and the tip surface 1
22 has a chucking shaft body 12 having a tool body insertion hole 123 opened therein, and a tool body 13 having a blade portion 131 on the tip end side and a shank portion 132 on the base end side. After the tool body 13 and the tool body 13 are formed as separate members, the tool body insertion hole 12
3, the outer peripheral surface 132a of the shank portion 132 fitted in
An adhesive layer 14 made of a cyano-based instant adhesive is formed between the tool body insertion hole 123 and the inner peripheral surface 123a,
The tool body 13 is fixed to the chucking shaft body 12. Here, the tool body insertion hole 123 is a tapered hole whose inner diameter is expanded toward the tip surface 122 side of the chucking shaft body 12, and the shank portion 13 of the tool body 13 is formed.
2 is a taper shank corresponding to the taper of the tool body insertion hole 123. The outer diameter of the shank portion 132 is
It is designed to be smaller than the inner diameter of the tool body insertion hole 123 in the corresponding portion, so that the adhesive layer 14 having a predetermined film thickness can be formed. Further, the chucking shaft body 12 is inserted into the tool body insertion hole 1 from the end face 124 on the base end side thereof.
A through hole 125 penetrating to 23 is formed, and the air inside the tool body insertion hole 123 can escape from the through hole 125. Furthermore, the tool body insertion hole 12
3, the center line of the chucking shaft body 12 is 3
2a and has a concentric shape, and the concentricity of the tool body 13 with respect to the chucking shaft body 12 is 0.002 mm or less.

As described above, the end mill tool 11 of this example
In the above, since the tool body insertion hole 123 is formed as a taper hole and the shank portion 132 of the tool body 13 is a tapered shank, the joining area between them is wide, so that the tool body 13 is fixed to the chucking shaft body 12. The strength is high, and the same effect as the end mill tool of the first embodiment is obtained. For example, the tool body 13 and the chucking shaft body 12 are separate members, and each has a function, so that the blade portion 131 and the shank portion 13 of the tool body 13 are not reduced in rigidity of the end mill tool 11.
Since each of the two can be manufactured to have a small diameter, the material cost is low and the processing amount is small.

On the other hand, the chucking shaft 12 is made thicker,
Even if the rigidity is increased, the material cost and processing cost of the end mill tool 11 are not significantly increased. Since the tool body 13 is fixed by the adhesive layer 14, the tool body 13 may be attached to the chucking shaft 1 if necessary.
It can also be easily removed from 2.

[Embodiment 3] FIG. 3A is a sectional view showing the structure of an end mill tool (cutting tool) according to Embodiment 3 of the present invention, and FIG. 3B is a front view seen from the tool body side. is there.

In these figures, the end mill tool 51 of this example has a chucking portion 521 on the outer peripheral side, a chucking shaft body 52 having a tool body insertion hole 523 that is tapered on the tip end surface 522, and a tip end side. Has a blade portion 531 and a tool body 53 whose proximal end side is a shank portion 532. The chucking shaft body 52 and the tool body 53 are formed as separate members, respectively, and then inserted into the tool body. An adhesive layer 54 made of a cyano-based instant adhesive is formed between the outer peripheral surface 532a of the shank portion 532 fitted in the hole 523 and the inner peripheral surface 523a of the tool body insertion hole 523, and the tool body 53 is chucked. It is in a state of being fixed to the king shaft body 52. Here, the tool body 5
The shank portion 532 of No. 3 is formed as a tapered shank, and a large bonding area is secured between them.

Also, in this example, the chucking shaft 5
2 is a sleeve housing hole 52 that opens at its tip surface 522.
6, and a sleeve 527 is fitted inside the sleeve housing hole 526. Here, the outer peripheral surface 527a of the sleeve 527 and the inner peripheral surface 526 of the sleeve housing hole 526 are
An adhesive layer 52 made of a cyano-based instant adhesive is provided between a and
8 is formed, the sleeve 527 has a sleeve receiving hole 52.
The inside of the sleeve 527 constitutes a tool body insertion hole 523 as well as being fixed to the inside of the sleeve 6. Also,
The outer peripheral surface 527a of the sleeve 527 and the inner peripheral surface 526a of the sleeve accommodating hole 526 are grooved in the axial direction thereof, and these grooves 527e and 526e form an outer peripheral surface 527a of the sleeve 527 and the sleeve accommodating hole 526. Of the chucking shaft 52 at the boundary with the inner peripheral surface 526a of the machining liquid supply hole 56a.
Are formed. Further, between the inner part 526b of the sleeve housing hole 526 and the end surface 527b of the sleeve 527,
A gap 56b communicating with the through hole 525 is partially formed, and the machining liquid supply hole 56a is formed through the gap 56b.
Communicate with the through hole 525. As a result, from the end face 524 on the base end side of the chucking shaft body 52 to the tip face 522 thereof.
Between the above, a machining liquid supply path 56 is formed by the through hole 525, the gap 56b, and the machining liquid supply hole 56a. The outer diameter of the shank portion 532 is designed to be smaller than the inner diameter of the tool body insertion hole 523 (the inner diameter of the sleeve 527) by about several μm, while the outer diameter of the sleeve 527 is smaller than the inner diameter of the sleeve housing hole 526. Since it is designed to be small by several μm, it is possible to form the adhesive layers 54 and 528 having a predetermined film thickness between them. Further, the tool body insertion hole 523, the sleeve storage hole 526
Since the center lines of the sleeve 527 and the sleeve 527 are on the center axis 52a of the chucking shaft 52, the concentricity of the tool body 53 with respect to the chucking shaft 52 is 0.0.
It is less than 02 mm.

As described above, the end mill tool 51 of this example
In the above, since the machining liquid supply path 56 is formed inside thereof, the machining liquid is supplied to the work side from the base end side of the chucking shaft body 52 at a high pressure via the machining liquid supply path 56 for machining. Therefore, it is not necessary to provide another machining liquid supply path outside the apparatus. Further, since a working fluid such as cutting fluid is sent through the inside of the end mill tool 51, it also functions as a cooling fluid, which prevents the end mill tool 51 from overheating. In particular, the working fluid is the sleeve 52.
7, outer peripheral surface 527a and sleeve housing hole 526 inner peripheral surface 5
Since the adhesive layers 54 and 528 are cooled by passing through the boundary with the adhesive layer 26a, the fixing force of the adhesive layers 54 and 528 does not decrease during processing. Moreover, since the tool body 53 and the chucking shaft body 52 are separate members, it is easy to perform groove processing on the inner peripheral surface 526a of the sleeve housing hole 526, so that the machining liquid inside the end mill tool 51 is processed. The supply path 56 can be easily formed. Further, the same effects as those of the end mill tool according to the first or second embodiment are also obtained. For example, since the tool body 53 and the chucking shaft body 52 are separate members and each has a function, the tool body 53 does not decrease in rigidity of the end mill tool 51.
Since both the blade portion 531 and the shank portion 532 can be manufactured to have a small diameter, the material cost is low and the processing amount is small. On the other hand, even if the chucking shaft body 52 is thickened to increase its rigidity, the material cost and the processing cost of the end mill tool 51 are not significantly increased.
Since the tool body 53 is fixed by the adhesive layer 54, the tool body 53 can be easily removed from the chucking shaft body 52 as necessary.

[Embodiment 4] FIG. 4 (a) is a sectional view showing the structure of an end mill tool (cutting tool) according to Embodiment 4 of the present invention, and FIG. 4 (b) is a front view seen from the tool body side. is there. Since the configuration of the end mill tool of this example is substantially the same as the configuration of the end mill tool of the third embodiment, detailed description of common parts will be omitted.

In these figures, the end mill tool 61 of this example has a chucking portion 621 on the outer peripheral side and has a tool body insertion hole 623 that tapers into the tip end surface 622 as in the end mill tool of the third embodiment. A chucking shaft body 62 and a blade portion 631 on the tip side,
A tool body 63 having a shank portion 632 on the base end side is formed. The chucking shaft body 62 and the tool body 63 are formed as separate members, and then fitted into the tool body insertion hole 623. Outer peripheral surface 632a of shank portion 632 and inner peripheral surface 623a of tool body insertion hole 623.
An adhesive layer 64 made of a cyano-based instant adhesive is formed between and, and the tool body 63 is fixed to the chucking shaft body 62. Here, the shank portion 632 is formed as a taper shank corresponding to the taper of the tool body insertion hole 623, and a wide bonding area between them is ensured. In addition, the chucking shaft body 62 has a tip surface 6
There is a sleeve housing hole 626 that opens at 22, and a sleeve 627 is fitted inside the sleeve housing hole 626, and between the outer peripheral surface 627a of the sleeve 627 and the inner peripheral surface 626a of the sleeve housing hole 626. The adhesive layer 628 is formed, and the sleeve 627 is fixed inside the sleeve housing hole 626. In this state, the inside of the sleeve 627 constitutes the tool body insertion hole 623.

Further, the outer peripheral surface 627a of the sleeve 627 is
The groove 6 is formed on the inner peripheral surface 626a of the sleeve housing hole 626.
27e and 626e are formed, and these grooves 627 are formed.
A processing liquid supply hole 66a that opens at the tip end surface 622 of the chucking shaft body 62 is formed in the boundary portion between the sleeve 627 and the sleeve storage hole 626 by e and 626e. Here, the depths of the grooves 627e and 626e are formed so as to change in the axial direction of the end mill tool 61, and the machining liquid supply hole 66a is opened toward the tip end side of the blade portion 631 of the tool body 63. Further, a gap 66b communicating with the through hole 625 is partially formed between the inner part 626b of the sleeve housing hole 626 and the end surface 627b of the sleeve 627, and the machining liquid supply hole is provided through this gap 66b. 6
6a communicates with the through hole 625. As a result, from the end face 624 on the base end side of the chucking shaft body 62 to the tip face 6 thereof.
A processing liquid supply path 66 is formed by the through holes 625, the gap 66b, and the processing liquid supply hole 66a up to 22.

The outer diameter of the shank portion 632 is designed to be smaller than the inner diameter of the tool body insertion hole 623 (the inner diameter of the sleeve 627) by about several μm, while the sleeve 6
The outer diameter of 27 is several μ compared to the inner diameter of the sleeve housing hole 626.
Since it is designed to be small by about m, it is possible to form the adhesive layers 64 and 628 having a predetermined film thickness therebetween. The center lines of the tool body insertion hole 623, the sleeve housing hole 626, and the sleeve 627 are all on the center axis line 62 a of the chucking shaft body 62, and the tool body 63 is the same as the chucking shaft body 62. They are formed in a core shape and their concentricity is set to 0.002 mm or less.

As described above, the end mill tool 61 of this example
In this case as well, since the machining liquid supply path 66 is formed inside thereof, it is not necessary to provide another machining liquid supply path, and the machining liquid supply path 66 is open toward the blade portion 631. Therefore, the working liquid is efficiently supplied to the blade portion 631. Further, since the working fluid also functions as a cooling fluid for the end mill tool 61, the end mill tool 61 is prevented from being overheated. In particular, the working fluid cools the adhesive layers 64 and 628 sufficiently, and does not cause the adhesive force to decrease due to the temperature rise. Moreover, since the tool body 63 and the chucking shaft body 62 are separate members, it is easy to form a groove on the inner peripheral surface 626a of the sleeve housing hole 626. Moreover, the same effects as those of the end mill tools according to the first to third embodiments are obtained. For example, since the tool main body 63 and the chucking shaft body 62 are separate members and each has a function, the blade portion 631 and the shank portion 632 of the tool main body 63 do not decrease in rigidity of the end mill tool 61. Since any of these can be manufactured to have a small diameter, the material cost is low and the processing amount is small. On the other hand, even if the chucking shaft body 62 is thickened to increase its rigidity, the material cost and the processing cost are not significantly increased. Since the tool body 63 is fixed by the adhesive layer 64, the tool body 63 can be easily removed from the chucking shaft body 62 as necessary.

[Modification of Embodiment 4] FIG. 5A shows an end mill tool (cutting tool) according to an improvement of Embodiment 4 of the present invention.
FIG. 5B is a cross-sectional view showing the structure of FIG. 5B, and FIG. Since the configuration of the end mill tool of this example is substantially the same as the configuration of the end mill tool of the fourth embodiment, common parts are designated by the same reference numerals and their description is omitted.

In these figures, the end mill tool 61a of the present example has a chucking portion 621 on the outer peripheral side, and a tool body insertion hole 623 that tapers into the tip surface 622 is formed as in the end mill tool of the fourth embodiment. The chucking shaft body 62 and the tool body 63 having the blade portion 631 on the tip end side and the shank portion 632 on the base end side are provided, and the chucking shaft body 62 and the tool body 63 are provided.
And the outer peripheral surface 632a of the shank portion 632 fitted into the tool body insertion hole 623 and the inner peripheral surface 623 of the tool body insertion hole 623 after being formed as separate members.
An adhesive material layer 64 made of a cyano-based instant adhesive is formed between the tool body 63 and a, and the tool body 63 is fixed to the chucking shaft body 62. Here, the shank portion 632 is formed as a taper shank corresponding to the taper of the tool body insertion hole 623, and a wide bonding area between them is ensured. Further, the length dimension of the shank portion 632 of the tool body 63 is set shorter than the length dimension of the tool body insertion hole 623.

Therefore, in the end mill tool 61a of this embodiment, in addition to the same effect as the end mill tool according to the fourth embodiment, the shank portion 632 of the tool body 63 is obtained.
Is set shorter than the length dimension of the tool body insertion hole 623, and a gap 63b is formed on the base end face side of the shank portion 632. Therefore, the shank portion 632 is inserted into the tool body insertion hole 623. The outer peripheral surface 632a of the shank portion 632 and the tool body insertion hole 623.
The gap generated between the inner peripheral surface 623a and the inner peripheral surface 623a can be minimized, and the shank portion 632 can be easily centered. Therefore, it is easy to control the shape in each taper process, and moreover, the shank portion 632 can be surely centered, so that the processing accuracy is improved.

In any of the above embodiments,
Although the end mill tool has been described as an example of the cutting tool, the present invention is not limited to this, and the shape of the blade of the tool body may be replaced with a drill tool or the like, and the shape of the blade is not limited. Further, the machining liquid supply hole may be formed in a spiral shape around the outer peripheral surface of the sleeve to enhance the cooling efficiency of the machining liquid passing through the inside of the machining liquid supply hole.

[0037]

As described above, according to the present invention, cutting is performed by the chucking shaft body and the tool body in which the shank portion is fitted in the tool body insertion hole and fixed to the chucking shaft body by the adhesive layer. Since it is characterized in that the tool is formed, the following effects are achieved.

Since the tool body and the chucking shaft body are formed as separate members, the tool body and the chucking shaft body can have structures corresponding to their respective functions. Therefore, even if the outer diameter of the tool body that requires the use of cemented carbide or high-speed steel is reduced, and the chucking shaft is thickened to increase its rigidity, the cost does not increase.

Since the tool main body and the chucking shaft body are separate members, the degree of freedom in their structural design is high. Therefore, it is possible to extend the length of the tool body and increase the amount of protrusion of the blade portion from the holder without any trouble. In addition, the tool body insertion hole is composed of a sleeve fixed inside the sleeve accommodating hole of the chucking shaft, while the machining liquid is supplied by using the groove formed on the outer peripheral surface of the sleeve or the inner peripheral surface of the sleeve accommodating hole. It is also easy to form holes. In this case, by opening the machining liquid supply hole toward the blade portion side of the tool body, the efficiency of supplying the machining liquid to the blade portion can be improved.

When a through hole that penetrates from the base end side of the chucking shaft body to the tool body insertion hole is formed, when the shank portion of the tool body is inserted into the tool body insertion hole on the chucking shaft body side, Since the air of (3) escapes through the through hole, the inserted tool body is not pushed back by the air, so that the assembly is easy.

When the tool body insertion hole is formed as a tapered hole while the shank portion of the tool body is formed as a tapered shank, the joint area between the shack portion and the tool body insertion hole is expanded to solidify the adhesive layer. The wearing power can be improved.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of an end mill tool according to a first embodiment of the present invention.

FIG. 2 is a schematic sectional view of an end mill tool according to a second embodiment of the present invention.

FIG. 3A is a schematic sectional view of an end mill tool according to a third embodiment of the present invention, and FIG. 3B is a front view from the tool body side.

4A is a schematic sectional view of an end mill tool according to a fourth embodiment of the present invention, and FIG. 4B is a front view from the tool body side.

5A is a schematic sectional view of an end mill tool according to an improved example of Embodiment 4 of the present invention, and FIG. 5B is a front view from the tool body side.

[Explanation of symbols]

1, 11, 52, 61, 61a ... End mill tool 2, 12, 52, 62 ... Chucking shaft body 3, 13, 53, 63 ... Tool body 4, 14, 54, 64, 528, 628 ... Adhesive material layer 21, 121, 521, 621 ... Chucking portion 22, 122, 522, 622 ... Tip surface 23, 123, 523, 623 ... Tool body insertion hole 25, 125, 525, 625 ... Through hole 31, 131, 531, 631 ... Blade portion 32, 132, 532, 632 ... Shank portion 56, 66 ... Machining liquid supply path 56a, 66a ... Machining liquid Supply hole 526, 626 ... Sleeve storage hole 526e, 626e, 527e, 627e ... Groove 527, 627 ... Sleeve

Claims (5)

[Claims] 1. A chucking shaft body having a chucking portion on the outer peripheral side, and a tool body insertion hole opening at a tip end surface,
A tool body having a blade portion on the tip side and a shank portion on the base end side, and the tool body has an outer periphery of the shank portion inserted into the tool body insertion hole of the chucking shaft body. A cutting tool, which is fixed to the chucking shaft body by an adhesive layer formed between a surface and an inner peripheral surface of the tool body insertion hole. 2. The cutting tool according to claim 1, wherein the chucking shaft body is formed with a through hole that penetrates from the end face on the base end side to the tool body insertion hole. 3. The chucking shaft body according to claim 2, wherein the chucking shaft body has a sleeve accommodating hole opened at a tip end surface thereof, and the inside of the chuck accommodating member is inserted into the sleeve accommodating hole to form the tool body insertion hole. A sleeve fixed by an adhesive layer formed between an outer peripheral surface and an inner peripheral surface of the sleeve accommodating hole, and formed on at least one side of the outer peripheral surface of the sleeve and the inner peripheral surface of the sleeve accommodating hole. A cutting liquid supply hole that is formed at the boundary between the two by the formed groove and opens at the tip end surface of the chucking shaft body and that communicates with the through hole. 4. The machining liquid supply hole according to claim 3, wherein at least a portion of the machining liquid supply hole on the tip surface side of the chucking shaft is formed toward the blade portion side of the tool body. A cutting tool. 5. The tool body insertion hole according to claim 1, wherein the tool body insertion hole is a taper hole whose inner diameter is expanded toward a tip end surface side of the chucking shaft body. The shank portion of the main body is a taper shank corresponding to the taper of the tool main body insertion hole.