JP2003266207A - Turning tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently feed a coolant to a cutting edge on the flank side with out complicating the structure, in a turning tool wherein a cutting edge tip is cramped to a tip bearing surface of a holder via a shim sheet. <P>SOLUTION: In the holder 2, a coolant feeding path 18 is formed, in which an outlet 20 is opened at the tip bearing surface 12. The shim sheet 3 has a jet opening 36 so as to spurt the coolant fed through the outlet 20 via the coolant feeding path 18 from the frank side. The coolant is spurted to the vicinity of the cutting edge 63, thereby being efficiently fed. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turning tool used for turning, and more particularly to a turning tool used for outer diameter machining, end face machining, etc. (Away tip or tip) is also clamped to the tip seating surface of the tip pocket of the holder via the shim sheet.

[0002]

2. Description of the Related Art In cutting a cast iron material with a throw-away tip whose cutting edge is made of CBN (cubic boron nitride), it is essential to efficiently supply (spray) coolant (cutting oil) to the cutting edge. is there. As a means to supply the coolant to the cutting edge portion, a coolant flow path is formed in the holder, and the coolant is fed into the flow path so that it is supplied to the cutting edge from the ejection port provided at the tip of the holder or cutting tool. Various technologies have been proposed.

By the way, it is desirable to supply the coolant to the cutting edge from both the rake face side and the flank face side. However, the coolant supplied from the rake side is
Since it is blocked by the discharged chips, it is difficult to efficiently supply the cutting edge. On the other hand, the life of the cutting edge tip is usually judged on the basis of flank wear. Further, it is the wear of the flank surface rather than the rake surface that affects the finished surface roughness (accuracy) in turning. Therefore, it is effective to supply the coolant to the cutting edge from the flank side. Japanese Patent Laid-Open No. 10-76404 discloses an example of such a technique. This is a tool with an oil hole (coolant flow path) that communicates with the tip of the holder (bit body), so that coolant (cutting oil) is ejected from the flank side of the tip of the holder. Is. In this product, a plate-shaped member with a recess for creating an oil passage is attached to the flank side of the tip of the holder, and the outlet of the oil passage serves as the cutting oil ejection port. The cutting oil is supplied to the flank side of the cutting edge.

[0004]

In the technique described in the above publication, the coolant can be supplied from the flank surface side of the tip of the holder toward the cutting edge, but a separate component called a plate member is required. Further, the mounting is required and the structure becomes complicated. Therefore, there is a problem that the manufacturing cost increases. In addition, in such a cutting tool, it is common to fix the cutting edge tip to the seat surface of the tip through a shim sheet (also called an anvil). With such a structure, it is possible to prevent the holder from being damaged when the cutting edge chip is damaged. However, if the shim sheet is interposed in this way, the distance from the ejection port to the cutting edge on the flank side increases by the thickness of the shim sheet, which causes a problem that the coolant supply efficiency to the cutting edge becomes poor. It was

The present invention has been made in view of these problems, and in a cutting tool in which a cutting edge tip is clamped on a tip seat surface of a holder via a shim sheet, a separate component is required for forming a coolant passage. In other words, it is an object of the present invention to provide a cutting tool that does not complicate the structure and that can efficiently supply the coolant toward the cutting edge on the flank side.

[0006]

SUMMARY OF THE INVENTION In order to solve the above problems, the invention according to claim 1 is a tool in which a cutting edge chip is clamped on a chip seating surface of a holder through a shim sheet, and the holder is An opening is formed in the tip seat surface, and a coolant supply flow path for feeding the coolant toward the exit is formed in the tip seat surface, and the coolant fed from the exit is jetted from the flank surface to the shim sheet. As described above, the bite is characterized in that a coolant ejection passage having an ejection opening is formed on the flank of the shim sheet.

In the bite of the present invention, since the coolant jet passage is formed in the shim sheet with the above-mentioned structure, no separate component is required to form the coolant passage, and the structure is not complicated. In addition, because the coolant ejection passage with the ejection port opening is formed on the flank side of the shim sheet,
The coolant can be efficiently supplied toward the cutting edge on the flank side. In addition, it is preferable that the ejection port is formed so as to be present in a portion corresponding to a portion responsible for cutting among the cutting edges of the clamped cutting edge tip when viewed from the rake face side. In the case of a rectangular tip having a nose, it is preferable that the coolant is ejected toward the nose when viewed from the rake face side.

According to a second aspect of the present invention, one or a plurality of the shim sheets are stacked, and the coolant ejection passage is formed in a concave shape on the lower surface of the shim sheet which is in contact with the tip seat surface. It is the byte according to claim 1.

According to a third aspect of the present invention, one or a plurality of the shim sheets are stacked, and the coolant ejection passage is formed in a through hole shape in the shim sheet in contact with the tip seat surface. It is the byte according to claim 1.

According to a fourth aspect of the present invention, in the bite according to any one of the first to third aspects, the coolant ejection passage is branched so that a plurality of ejection ports are provided on the flank of the shim sheet. is there.

According to a fifth aspect of the present invention, the surface roughness of the tip seating surface and the lower surface of the shim sheet in contact with the tip seating surface are both Ra 0.8 μm or less. It is a byte described in any of. However, it is more preferable to set the surface roughness as in the present invention according to claim 6. That is, in the present invention according to claim 6, the surface roughness of both the tip seating surface and the bottom surface of the shim sheet in contact with the tip seating surface is Ra 0.4 μm.
The bite according to any one of claims 1 to 4, which is set to m or less.

According to a seventh aspect of the present invention, a liquid-tight packing for preventing coolant from leaking is interposed between the tip seat surface and the lower surface of the shim sheet in contact with the tip seat surface. The byte according to any one of claims 2 to 6.

The present invention according to claim 8 is the one in which a plurality of the shim sheets are stacked, and the coolant jetting passage is formed in a through hole shape in the plurality of stacked shim sheets. This is the byte described in 1.

The present invention according to claim 9 is the bite according to claim 8, wherein the coolant ejection passage is branched so that a plurality of ejection ports are provided on the flank of the shim sheet.

According to a tenth aspect of the present invention, an upper surface and a lower surface of a plurality of shim sheets that form the coolant ejection passage are in contact with each other, and the tip seat surface is in contact with the tip seat surface. The surface roughness of the lower surface of each of the shim sheets is Ra 0.8 μm or less.
Or the byte described in either 9. However, it is more preferable to set the surface roughness as in the present invention according to claim 11. That is, the present invention according to claim 11 is such that the upper surface and the lower surface of a plurality of stacked shim sheets forming the coolant ejection passage are in contact with each other, and the tip seat surface is in contact with the tip seat surface. The cutting tool according to claim 8 or 9, wherein the bottom surface of the shim sheet has a surface roughness Ra of 0.4 µm or less.

According to a twelfth aspect of the present invention, a plurality of shim sheets forming the coolant ejection passages are provided between the upper and lower surfaces in contact with each other, and between the tip seat surface and the tip seat. The bite according to any one of claims 8 to 11, wherein liquid-tight packings for preventing the coolant from leaking are interposed between the shim sheet and the lower surface of the shim sheet which are in contact with the surface.

The shim sheet is usually formed of a sintered body such as cemented carbide or a steel material such as high speed steel. On the other hand, a shim sheet made of a sintered body such as cemented carbide is manufactured by press-forming raw material powder into a shim sheet shape and sintering the press-formed press-formed body. Therefore, the flow path can be formed without forming it when the press-formed body is formed or in the calcined body, which facilitates manufacturing.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a cutting tool according to the present invention will be described in detail with reference to FIGS. In the figure,
Reference numeral 1 is a bite according to the present embodiment, and a holder (2), a shim sheet (3), a fixing screw (5), a throw-away tip (6), and a clamp (fixing) means for the throw-away tip (6) such as a presser foot (7) and a clamp screw (8). It is composed of.

The holder (shank) 2 is made of chromium molybdenum steel (for example, SCM440) and has a rod-like shape with a square cross section, and a chip pocket 11 is recessed at the corner of the top surface of the tip (see FIG. 3). Chip pocket 1
1 is a substantially diamond shape in plan view, the bottom surface is a chip seat surface 12,
It is formed flat (flat). Around the tip seating surface 12, two wall surfaces 13 and 14 which are substantially perpendicular to each other stand up in a intersecting manner in a plan view. These two walls 13, 14
As will be described later, the shim seat 3 is mounted and fixed on the tip seating surface 12, and the side surface (flank surface 61) of the throw-away tip 6 mounted and fixed on the upper surface of the shim seat 3.
It is formed so as to restrain. In the present embodiment, a screw hole 15 for inserting the flat head screw 5 for tightening the shim sheet 3 is provided substantially in the center of the tip seat surface 12 substantially perpendicular to the tip seat surface 12. The shape and the size of the rhombus in plan view of the tip seat surface 12 are the same as the shim sheet 3 to be placed and fixed thereon and the plane of the rhombus throw-away tip 6 to be placed and fixed on the shim sheet 3. The shape and size are substantially the same as the visual shape. Further, a screw hole (not shown) for a clamp screw 8 for fixing the chip 6 with a presser foot 7 is provided on the upper surface of the holder 2. The above is the same as the conventional holder (bite body).

On the other hand, in this embodiment, the coolant supply passage (hole) 18 is formed in the shaft (stem) portion 1 of the holder 2. The coolant supply passage 18 extends from the inlet 19 opened at the rear end of the holder 2 toward the tip of the holder 2,
At the tip end portion, the direction is changed toward the tip seating surface 12 side, and it is formed so as to communicate with the outlet 20 opened in the tip seating surface 12. However, the outlet 20 is provided at the outer corner 21 of the tip seating surface 12 and the screw hole 1
It is opened between 5 and 5. Further, the inlet 19 opening at the rear end of the holder 2 is a connection port for connecting a hose that supplies a coolant from a coolant supply device (not shown). The coolant supply passage 18 is
The cross section of the channel is, for example, circular with a diameter of 2 to 5 mm.
The coolant supply flow path 18 traverses (penetrates) the holder 2 perpendicularly to the chip seating surface 12, and has an inlet at the holder 2
It may be freely set, for example, it may be provided so as to open on the lower surface 23.

A chip pocket 1 of such a holder 2
On the tip seating surface 12 formed by the bottom surface of 1, the chip seating surface 12 has substantially the same shape as the tip seating surface 12 (diamond shape in this example), the same size
One shim sheet 3 having a constant thickness (flat plate shape) is placed. As shown in FIGS. 4 and 5, the shim sheet 3 is provided with a through hole 31 having a flat surface at the substantially center thereof in a plan view, and a flat screw 5 is inserted into the through hole 31 to form a screw hole by a sinking method. The shim sheet 3 is fixed to the seat surface of the chip by being screwed in. The upper surface of the head of the flat head screw 5 is set so as not to protrude above the upper surface of the shim sheet 3.

Now, as shown in the figure, such a shim sheet 3 has a lower surface 32 in contact with the chip seating surface 12 in this example.
A concave groove is formed in the coolant discharge passage 3
3 is formed. The coolant ejection passage 33 extends from the outlet 20 opening to the tip seat surface 12 of the holder 2 toward the acute corner 34 of the shim seat 3 toward the outer corner 21 of the tip seat surface 12. That is, the coolant fed from the outlet 20 of the tip seating surface 12 passes through the coolant jetting flow passage 33 to reach the opening of the flank 35 of the shim seat 3, and this opening forms the jetting outlet 36 so as to be jetted from there. There is. In addition,
Two coolant ejection passages 33 may be provided symmetrically in FIG. By doing so, erroneous setting is prevented. The chip seating surface 12 and the lower surface 32 of the shim sheet 3 are flat (planar) and processed with a high finished surface roughness, and by screwing the flat head screws 5, the close contact between the both surfaces 12, 32 is achieved. This prevents the coolant from leaking from other than the jet port 36. The shim sheet 3 is made of cemented carbide or high speed steel.

In the cutting tool 1 of this embodiment, the throw-away tip 6 is placed and fixed on the upper surface 38 of such a shim sheet 3. For fixing, the side surface of the throw-away tip 6 is brought into contact with the wall surfaces 13 and 14 of the tip pocket 11, and is pressed onto the rake surface 62, for example, by the tip of the presser foot 7. For details, a clamp screw (not shown) is held. It is fixed by screwing from the upper surface of 2.

When turning the outer peripheral surface or the end surface of the work (work) W with the cutting tool 1 of this embodiment, the coolant supply passage 18 at the rear end of the holder 2 is used.
Connect a hose to the inlet 19 of the and feed the coolant from the coolant supply device. The supplied coolant reaches the outlet 20 of the chip seat surface 12 through the coolant supply passage 18 of the holder 2, passes through the coolant ejection passage 33 provided on the lower surface 32 of the shim seat 3, and then is ejected to the flank. It is ejected from the exit 36. Coolant supply channel 18
The arrow in the coolant ejection passage 33 indicates the flow of the coolant. The coolant ejected from the ejection port 36 is supplied from the gap between the outer peripheral surface or the end surface of the work material W and the flank 61 of the throw-away tip 6 to the cutting edge 6
3 is supplied. The coolant ejected in this way is
Since it is supplied from the ejection port 36 formed in the flank 35 of the shim sheet 3 immediately below the cutting edge 63, not from the tip end face of the holder (shank) 2 as in the conventional case, the supply portion (cutting) from the ejection port 36. The distance to the blade) is short. Therefore, in this embodiment, the coolant can be efficiently supplied toward the cutting edge 63. In addition, since a separate component is not required to form the coolant passage, the structure is not complicated.

In this embodiment, since the shim sheet 3 is made of a sintered body such as a cemented carbide, the coolant ejection passage 33 is also formed at the time of manufacturing the press-molded body (or at the time of calcination), thereby manufacturing the press-molded body. You can It should be noted that the side closer to the cutting edge tip (upper surface) at the opening edge of the ejection port 36 may be formed in an outwardly widened shape (being chamfered) as shown in FIG. 2 in a side sectional view. . If this is done, the coolant will be ejected so as to be guided by the outwardly spread shape, so the ejected coolant will be
It becomes easy to face the cutting edge 63. In the above-mentioned form, another conventional shim sheet 3 may be interposed between the shim sheet 3 and the chip 6.

FIG. 6 shows a modification of the above embodiment. This product has one shim sheet for the above-mentioned form.
Although the number of sheets is two, the difference is that the two sheets of shim sheets are embodied. Therefore, the same parts are denoted by the same reference numerals, and only different points will be described. That is, in this embodiment, between the shim sheet 3 and the throw-away tip 6 in the above-mentioned embodiment,
Another normal shim sheet 43 having a constant thickness is interposed. In this case, the cutting edge 63 from the jet port 36
This is effective when the chip breaks and the shim sheet immediately below the chip breaks even though the distance to is increased. This is because the normal shim sheet 43 can be broken.

FIG. 7 shows an embodiment of claim 3. However, only the coolant ejection passage 33 formed in the shim sheet 3 is different from the above-mentioned form.
Therefore, only the differences will be described, and the same portions will be denoted by the same reference numerals. That is, in the present embodiment, the coolant ejection passage 33 in the shim sheet 3 is formed in a penetrating shape (tunnel shape) from the lower surface 32 of the shim sheet 3 toward the flank in a side sectional view. When the coolant ejection passage 33 is provided in this way,
The distance D from the ejection port 36 to the cutting edge 63 can be further reduced. The coolant ejection passage 33 may be formed in a concave shape on the upper surface 38 of the shim sheet 3 by penetrating the shim sheet 3 in the thickness direction.

FIG. 8 shows an embodiment of claim 4, which is, so to speak, an improvement of the shim sheet. That is, as shown in FIG. 8, this has two ejection ports 36 on the flank 35 of the shim sheet 3. That is, the coolant ejection passage 33 in the shim sheet 3 is branched into two so as to sandwich the corner 34 of the shim sheet 3 when viewed from the upper surface or the lower surface side, and two flank surfaces (front flank surface and lateral flank surface) 35 side And a spout 36 is provided in each.

In the bite using the shim sheet of this embodiment,
It is suitable when embodied as a cutting tool used in a machining form such as outer peripheral surface machining and end surface machining, which is responsible for cutting at both cutting edge nose portions of the cutting tip 6 of the cutting tip 6. This is because the coolant can be reliably supplied to the cutting edge that is required to be supplied according to each processing. In addition, each spout 36
Is the nose (corner 3
4) so as to be ejected toward 4).
Set the orientation of. When branching the coolant ejection passage 33 in this manner, the lower surface 32 of the shim sheet 3 is used.
It is preferable to form a concave shape at or on the upper surface because the formation is easy.

Further, in the case where the jet port 36 is provided by branching in this way, the strength of the shim sheet 3 is improved or stabilized. A throwaway insert with a nose (corner), such as a triangular or quadrangular polygonal insert, concentrates its cutting force on the nose. Like the shim sheet 3 in FIG. 5, the jet port 3 is placed at a flat position corresponding to the nose.
When 6 is provided, the tip end portion of the shim sheet 3 is in a floating shape due to the existence of the ejection port 36. For this reason, the strength of the cutting edge or the shim sheet 3 is reduced, whereas the structure in which the ejection port 36 is branched does not have such a structure, so that the strength is improved or stabilized.

In each of the above-mentioned embodiments, the tip seat surface 12 and the shim sheet 3 in contact with the tip seat surface 12 are provided.
The surface roughness of the lower surface 32 is preferably Ra 0.3 μm or less. With such a surface roughness, it is possible to substantially prevent the coolant from leaking even when the metal surfaces are in contact with each other.

If necessary, in order to prevent the coolant from leaking between the tip seating surface 12 and the lower surface 32 of the shim sheet 3 in contact with the tip seating surface 12, as shown in FIGS.
It is also possible to interpose the liquid-tight packings 81 and 82 having a planar shape as shown in FIG. In FIG. 9, reference numeral 83 is a notch corresponding to the coolant ejection passage 33, and 84 is a hole for inserting a flat head screw. The liquid-tight packing 81 shown in FIG. 9 is of the same thickness as the lower surface of the shim sheet of the cutting tool shown in FIG. 1 and has a constant thickness (plate packing). The liquid-tight packing 81 shown in FIG. In the case of intervening in, the result is as shown in FIG. However, the tip seat surface 12
It is also possible to provide only the outlet 20 that opens to the bottom and the hole 84 through which the flat head screw is inserted.

Further, the liquid-tight packing 82 shown in FIG.
For the shim sheet of the bite shown in Fig. 4, which has the same planar shape as the lower surface and a constant thickness (plate packing)
In FIG. 12, a hole 85 corresponding to the outlet 20 opening on the tip seating surface 12 and a hole 84 for inserting a flat head screw are provided. FIG. 12 is a partially enlarged view of a cutting tool in which the liquid-tight packing 82 is interposed. is there. Note that this is basically the same as that of FIG. 11 except that it is a bite that uses one shim sheet 3 having two ejection ports 36 on the flank 35. Therefore, the same parts are designated by the same reference numerals and the description thereof is omitted. Such a liquid-tight packing is
For example, it is needless to say that it is not limited to the one shown in FIGS. 9 and 10 as long as it is made of synthetic rubber and has a shape or configuration capable of preventing the coolant from leaking from other than the ejection port.

FIG. 13 shows an embodiment of claim 8. This is because the lower shim sheet 3 is formed by stacking two shim sheets, and in a state where the coolant jetting flow passage 33 is viewed in side cross-section, the two shim sheets 3 and 43 are stacked.
The shim sheet 43 is formed so as to penetrate from the lower surface 32 to the flank surface of the upper shim sheet 43. That is, it is the same as the one shown in FIG. 7 in which the shim sheet 3 is divided into two pieces so that the coolant ejection passage 33 is formed by both of the divided portions. Therefore, the same parts as those in the same embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. In the case of using the two shim sheets 3 and 43, the distance from the ejection port 36 to the cutting edge 63 can be made smaller than that of FIG. 6, so that the coolant can be more efficiently supplied to the cutting edge. You can

In this case, the plurality of shim sheets 3 and 43 are stacked, and the coolant ejection passage 33 is
Even in the case where a plurality of stacked shim sheets are formed in a through-hole shape, as shown in FIG. 8, even if the coolant ejection passage 33 is branched so that the ejection ports 36 on the flanks of the shim sheets are plural. Good.

Further, the upper surface 38 and the lower surface 32 of the plurality of shim sheets 3 and 43 forming the coolant ejection passage 33 which are in contact with each other, and the tip seat surface 12 and the tip seat surface 12 are in contact with each other. Lower surface 32 of shim sheet 3
By setting the surface roughnesses of both to Ra 0.3 μm or less, it is possible to substantially prevent the coolant from leaking.

Then, if necessary, the coolant ejection passage 3
Shim sheets 3, 43 forming a plurality of 3
Between the upper surface 38 and the lower surface 32 contacting each other, and between the tip seating surface 12 and the lower surface 32 of the shim sheet 3 contacting the tip seating surface 12, respectively, a liquid-tight seal for preventing the leakage of the coolant. You may interpose packing. A liquid-tight packing formed so as not to block the coolant ejection passage 33 may be used.

The present invention is not limited to the above-described cutting tools of various forms, and can be embodied in cutting tools of various turning forms as appropriate without departing from the scope of the invention. For example, in each of the above-described embodiments, the tool is embodied as a cutting tool with a diamond-shaped throw-away tip (cutting edge tip) fixed, but a cutting tool with a circular cutting edge fixing a throw-away tip can be similarly embodied.
The planar shape of the shim sheet is usually the same as or similar to the cutting edge tip, but the planar shape of the shim sheet of the present invention is not particularly limited to this. Further, the fixing means for fixing the shim seat to the chip seating surface has been described in the above-mentioned embodiment in the case of fixing with the countersunk screw, but is not limited thereto. It may be the same as the fixing means of the cutting edge tip. The shim sheet is not limited to the one made of cemented carbide, and may be embodied as a sintered body such as cermet or ceramic, or may be embodied as a steel material.

[0039]

As is apparent from the above description, according to the cutting tool of the present invention, in the cutting tool in which the cutting edge chip is clamped on the chip seating surface of the holder through the shim sheet, it is necessary to form the coolant passage. No parts are required and the structure is not complicated. In addition, the configuration allows the coolant to be efficiently supplied toward the cutting edge on the flank side.

Therefore, it is essential to efficiently supply (spray) the coolant to the cutting edge portion.
If it is embodied in a cutting tool that clamps a cutting edge tip such as a throw-away tip with a cutting edge made of CBN (cubic boron nitride), the supply efficiency is good, and the cutting edge life is expected to be significantly extended. To be done.

[Brief description of drawings]

FIG. 1 is a partially broken cross-sectional view and a partially enlarged view of a bite of the present invention viewed from a side flank surface side.

FIG. 2 is a partially enlarged view of the enlarged view of FIG.

FIG. 3 is a partially enlarged plan view of the tip of the holder.

FIG. 4 is a perspective view of a shim sheet.

5A is a horizontal center cross-sectional view of the shim sheet, and FIG. 5B is a view of the shim sheet as seen from the lower surface side.

FIG. 6 is a partially enlarged view showing a modified example of the cutting tool of the present invention.

FIG. 7 is a partially enlarged view showing an embodiment of claim 3.

FIG. 8 is a view of another form of the shim sheet viewed from the lower surface side.

FIG. 9 is a plan view of a liquid-tight packing.

FIG. 10 is a plan view of a liquid-tight packing.

11 is a partially enlarged view of FIG. 2 with the liquid-tight packing of FIG. 9 interposed.

FIG. 12 is a partially enlarged view of the cutting tool with the liquid-tight packing of FIG. 10 interposed.

FIG. 13 is a partially enlarged view showing the embodiment of claim 8.

[Explanation of symbols]

1 byte 2 holder 3,43 sim sheet 6 Throw-away tip 12 Tip seat surface 18 Coolant supply channel 20 Coolant supply channel outlet 36 Coolant jetting outlet 33 Coolant ejection passage 81, 82 Liquid tight packing

Claims (12)

[Claims] 1. A cutting tool in which a cutting edge chip is clamped on a chip seating surface of a holder via a shim sheet, and an outlet is opened in the chip seating surface of the holder and a coolant is fed toward the outlet. A coolant supply passage for forming a coolant is formed in the shim sheet so that the coolant fed from the outlet is jetted from the flank side so that a jet outlet is opened in the flank of the shim sheet. Bytes that are characterized by. 2. The shim sheet is formed by stacking one or more sheets, and the coolant ejection passage is formed in a concave shape on a lower surface of the shim sheet in contact with the tip seat surface. Part-Time Job. 3. The shim sheet according to claim 1, wherein one or a plurality of the shim sheets are stacked, and the coolant ejection passage is formed in a through hole shape in the shim sheet in contact with the tip seat surface. Part-Time Job. 4. The cutting tool according to claim 1, wherein the coolant ejection passage is branched so that a plurality of ejection openings are provided on the flank of the shim sheet. 5. The surface roughness of the tip seating surface and the bottom surface of the shim sheet in contact with the tip seating surface are both Ra0.
The cutting tool according to any one of claims 1 to 4, which has a size of 8 µm or less. 6. The surface roughness of the tip seating surface and the bottom surface of the shim sheet in contact with the tip seating surface are both Ra0.
The cutting tool according to any one of claims 1 to 4, which has a thickness of 4 µm or less. 7. A liquid-tight packing for preventing a coolant from leaking is interposed between the tip seat surface and a lower surface of the shim sheet in contact with the tip seat surface.
The byte according to any one of to 6. 8. The cutting tool according to claim 1, wherein a plurality of the shim sheets are stacked, and the coolant ejection passage is formed in a through hole shape in the plurality of the stacked shim sheets. 9. The cutting tool according to claim 8, wherein the coolant ejection passage is branched so that a plurality of ejection openings are provided on the flank of the shim sheet. 10. A surface roughness of an upper surface and a lower surface of a plurality of shim sheets which are in contact with each other, and a tip seat surface and a lower surface of a shim sheet which is in contact with the chip seat surface, of the plurality of shim sheets forming the coolant ejection passage. Both Ra 0.8μ
The cutting tool according to claim 8, wherein the cutting tool is m or less. 11. A surface roughness of an upper surface and a lower surface of a plurality of shim sheets which are in contact with each other, and a tip seat surface and a lower surface of a shim sheet which is in contact with the chip seat surface of the shim sheets forming the coolant ejection passage. Both Ra 0.4μ
The cutting tool according to claim 8, wherein the cutting tool is m or less. 12. A plurality of shim sheets, which form the coolant ejection passage, are arranged between a top surface and a bottom surface of the shim sheets in contact with each other, and the tip seat surface and a bottom surface of the shim sheet in contact with the tip seat surface. The bite according to any one of claims 8 to 11, wherein a liquid-tight packing for preventing coolant from leaking is interposed between the tool and the tool.