JP2009107027A - Cutting tool and method of cutting using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting tool with its service life prolonged by suppressing the premature wear and sudden breakage of a cutting blade produced by the heating of the area near the cutting blade (cutting portion) by a control mechanism for easily and accurately controlling the jetting pressure of a fluid. <P>SOLUTION: This cutting tool comprises a tool body part and a cutting blade part which is positioned at the end of the tool body part and on which at least one cutting blade is formed. The tool body part comprises a first coolant hole formed therethrough. The cutting blade part comprises a second coolant hole which communicates with the first coolant hole and which is opened to the outside of the cutting blade part. A control member having a groove part formed from one end to the other end along the axis thereof is detachably fitted to the opening of the second coolant hole. The area of the control member at the cross section of the groove part generally perpendicular to the axis thereof is larger at the other end than at the one end. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cutting tool such as a face mill, an end mill, and a drill.

  In general, in rotary cutting such as face milling, end mills, and drills, fluids such as cutting oil and air are supplied to the cutting part for the purpose of cooling, lubrication, chip removal, and the like of the cutting part.

  Such a fluid supply mechanism such as cutting oil or air is roughly divided to supply the fluid from the outside of the cutting tool with the tip of the flexible hose of the cutting oil supply device provided in the external device facing the cutting site. Some have been proposed to supply fluid from the spindle of an external device through the inside of the cutting tool.

  In the former, there is a problem that some external force is applied to the flexible hose, the direction in which the fluid is ejected is shifted, and the fluid is not sufficiently supplied to the required location.In contrast, the fluid is supplied through the inside of the cutting tool. The latter has been widely used in recent years to reduce such problems.

As an example of the latter, in Patent Document 1, in a rotary tool such as a milling cutter or an end mill, when it is necessary to change the rotation speed / feed speed of a cutting tool and change the direction of ejection of a fluid such as cutting oil, it is simple. A tool that can change the cutting oil supply location in a short time by operation is disclosed. Specifically, first and second fluid passages are provided inside the cutting tool, and the flow of the second fluid passage is at the outlet side of the second fluid passage located on the cutting blade side. A cutting tool is disclosed in which a component whose direction can be changed is detachably attached. With such a configuration, it is said that the target location (fluid flow direction) for supplying the fluid in a short time can be changed by a simple operation using a spanner or a hexagon wrench.
JP 2002-46014 A

  However, not only the direction (position) in which fluid such as cutting oil should be ejected changes depending on the processing conditions such as the processing mode and the rotation speed / feed rate of the cutting tool, but also occurs in the cutting part depending on the processing mode and processing conditions. Since the magnitudes of the cutting heats are different, it has not been possible to prevent the cutting blade temperature from rising locally only by changing the direction in which the fluid such as cutting oil is ejected to change the target location. As a result, there have been problems such as rapid wear of the cutting edge and sudden loss.

  Also, with conventional cutting tools, when adjusting the jet pressure depending on the processing conditions, the jet pressure of the fluid supplied from the external device itself is adjusted at any time by adjusting the valve opening / closing of the external device. Therefore, there is a problem that work efficiency is lowered. Further, since the valve opening / closing adjustment mechanism of the external device is rough, it has been difficult to accurately adjust the fluid ejection pressure according to the processing form and processing conditions.

  The present invention has been made to solve the above-described problems of the prior art, and is generated in each part of the cutting blade without changing the jet pressure of fluid such as cutting oil supplied from an external device. By having an adjustment mechanism that easily and accurately adjusts the ejection pressure of the fluid supplied to the vicinity of each part of the cutting edge according to the cutting heat, the cutting edge rapidly generated by heat generation near the cutting edge (cutting part) An object of the present invention is to provide a cutting tool having a long tool life by suppressing excessive wear and sudden breakage.

  In order to solve the above-mentioned problems, a cutting tool of the present invention is a cutting tool having a tool main body part and a cutting blade part which is located on the tip side of the tool main body part and at least one cutting blade is formed. The tool main body has a first coolant hole provided therethrough, and the cutting edge communicates with the first coolant hole and opens to a portion where the cutting edge does not exist. A second coolant hole provided in the second coolant hole, and an adjustment member that is attached to the opening of the second coolant hole and has a groove formed from one end to the other end. An area in a cross section of the groove portion substantially perpendicular to the axis of the groove is larger at one end than at one end.

With such a configuration, an adjustment member that has a simple structure fitted to the cutting blade portion and is easy to process allows the ejection pressure supplied to the vicinity of the cutting blade to be easily operated without opening and closing the valve of the external device. Since it can be adjusted, the cooling efficiency is increased, wear of the cutting edge and sudden chipping can be suppressed, and a cutting tool having a long tool life can be provided at low cost.
In addition, it is desirable that the second coolant hole is formed to extend toward the cutting edge because fluid is effectively ejected to the cutting edge and cooling efficiency is increased.

  Furthermore, since the area in the cross section of the groove portion substantially perpendicular to the axis of the adjustment member gradually increases from one end to the other end, the ejection pressure can be adjusted with high accuracy. desirable.

  Moreover, it is desirable that the inner surface of the groove portion of the adjusting member has a concave curved surface shape, because the pressure applied to the groove portion by the fluid can be dispersed to prevent the groove portion from being lost.

  Further, the inner surface of the groove portion of the adjustment member has an arc whose cross section substantially perpendicular to the axis of the adjustment member is an arc, so that the groove portion can be easily machined using a tool such as a drill. This is desirable because cost can be reduced.

The opening of the second coolant hole has a tapered shape with an opening diameter increasing toward the outside. The opening of the groove functions as a surface for guiding the direction of fluid ejection, and the fluid ejection This is desirable because the direction can be stabilized.

  In the cross section of the adjustment member including the axis of the adjustment member, an angle formed between the opening of the second coolant hole and the axis is substantially equal to an angle formed between the inner surface of the groove and the axis. It is the same that the opening part of the second coolant hole and the inner surface of the groove part are arranged so as to be substantially symmetrical with respect to the fluid flow direction, and the fluid ejection direction such as guiding the fluid discharge direction is stabilized. This is desirable because it increases the function of cooling and further improves the cooling efficiency.

  Furthermore, the adjustment member is attached so that the one end is located on the distal end side of the cutting blade portion and the other end is located on the proximal end side of the cutting blade portion. Since the one having a smaller opening area is arranged on the tip side of the cutting blade portion, the function of adjusting the ejection pressure is enhanced, which is desirable.

  In addition, it is desirable that a plurality of groove portions of the adjustment member be provided in order to improve cooling efficiency.

  In addition, a plurality of the second coolant holes are formed, and the openings of the plurality of second coolant holes are arranged corresponding to the cutting blades due to the cutting heat generated during cutting. The fluid can be effectively supplied to the cutting blade that tends to rise, and the cooling efficiency can be improved.

  In order to solve the above-mentioned problem, a cutting method of a work material according to the present invention is a method of cutting a work material using the cutting tool, and a proximity step of bringing the cutting tool relatively close to the work material A cutting process in which the work material or the cutting tool is rotated, the cutting tool is brought into contact with the surface of the work material to cut the work material, and the work material and the cutting tool are relatively And a separation step of moving away from each other.

  With such a configuration, since the work material is processed using a cutting tool having excellent cooling efficiency, an increase in the temperature of the work surface of the work material can be suppressed, and cutting with high finished surface accuracy can be realized.

  According to the cutting tool of the present invention, without changing the jet pressure of fluid such as cutting oil supplied from an external device, in the vicinity of each part of the cutting blade according to the cutting heat generated in each part of the cutting blade. The ejection pressure of the fluid to be supplied can be adjusted easily and accurately, and a cutting tool with a long tool life can be provided by suppressing rapid wear and sudden breakage of the cutting edge.

  In addition, according to the cutting method of the present invention, since the work material is processed using a cutting tool with excellent cooling efficiency, it is possible to suppress an increase in the temperature of the work surface of the work material, and cutting with high finished surface accuracy. Can be realized.

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

  1 to 4 show an embodiment of the present invention. FIG. 1A is an overall side view including a partial sectional view of a cutting tool 1 according to a first embodiment of the present invention, FIG. 1B is a bottom view thereof, and FIG. 2 shows the cutting tool 1 of FIG. (A) Whole perspective view, (b) Top view, (c) Bottom view, (d) Cross-sectional view including the axis L. 3A is an enlarged view of the main part of FIG. 1 when a configuration with a high ejection pressure is made, and FIG. 3B is an enlarged view of the main part of FIG. 1 when a configuration with a low ejection pressure is made.

  The cutting tool 1 by 1st embodiment of this invention is demonstrated in detail using FIG. 1 thru | or FIG.

  The cutting tool 1 according to the first embodiment of the present invention shown in FIGS. 1 to 3 includes a tool main body 11 that is gripped by an external device, and at least one cutting edge that is positioned on the distal end side of the tool main body 11. And a cutting edge portion 12 formed with 2.

  The tool main body 11 has a first coolant hole 3 penetrating through the rotation center portion, and the cutting edge 12 communicates with the first coolant hole 3 and at a portion where the cutting edge 2 does not exist. And a second coolant hole 4 provided to be open. An adjusting member 5 that adjusts the ejection pressure of the fluid supplied from the second coolant hole 4 to the vicinity of the cutting edge is attached in the opening 41 of the second coolant hole 4. In the present embodiment, as shown in FIG. 1, the cutting insert in which the cutting blade 2 is formed is fixed to the cutting blade portion 12 by a fixing member.

  With such a configuration, the adjusting member 5 that can adjust the jet pressure of the fluid is attached to the main body of the cutting tool 1, so that the jet pressure can be easily adjusted and work efficiency can be improved.

  The first coolant hole 3 is connected to a nozzle of an external device to which a fluid is supplied, and is formed so as to penetrate at least the tool body 11. In the present embodiment, as shown in FIG. 1, the first coolant hole 3 is also partially formed on the rear end side of the cutting edge portion 12.

  The second coolant hole 4 is formed to extend toward the cutting edge 2. That is, the opening 41 is provided so as to be positioned in the vicinity of the cutting edge 2 so that the fluid is ejected in the vicinity of the cutting edge 2 having a large temperature rise due to cutting heat generated during cutting. For example, although depending on the diameter of the cutting edge portion 12 of the cutting tool 1, specifically, the fluid is supplied to the tip of the cutting edge 2 through the opening 41 of the second coolant hole 4 with respect to the cutting edge 2. As described above, the axial center L of the adjusting member 5 is provided so as to extend toward the tip of the cutting edge 2, specifically, toward the corner of the cutting edge 2 on the tip side and on the outer peripheral side. This is preferable. That is, by providing the second coolant hole 4 in the cutting edge portion 12 so that the axial center L of the adjusting member 5 fitted in the second coolant hole 4 extends toward the tip end side corner of the cutting edge 2, Sudden breakage and wear of the blade 2 can be suppressed, and processing accuracy can be improved.

The fluid supplied to the vicinity of the cutting blade 2 is used as a cooling medium and may be a gas or a liquid. For example, a gas such as air or nitrogen, or a liquid such as water or oil can be used. In particular, it is desirable to use compressed air. Further, the adjustment member 5 is a screw member in which a groove 51 extending from one end to the other end along the axis L is formed. Specifically, it is a screw member having an external thread formed on the outer periphery, and as shown in FIG. 2B, a hexagonal recess 52 that fits with a hexagon wrench is formed on the surface (lower surface) on one end A side. ing. A female screw that is screwed with the male screw is formed on the inner peripheral surface of the second coolant hole 4. The adjusting member 5 that is a screw member is attached to the second coolant hole 4 by a hexagon wrench or the like so as to be able to advance and retract in the direction of the axis L. At this time, the adjustment member 5 is fitted and attached to the second coolant hole 4 so that the other end B of the adjustment member 5 is positioned on the inner peripheral side of the cutting edge portion 12.

As shown in FIGS. 2B and 2C, the adjusting member 5 that forms such a screw member has an area S ₅₁ in the cross section of the groove 51 that is substantially perpendicular to the axis L of the adjusting member 5 other than one end. It is formed to be large at the end. That is, the area S _{51A at} one end A (shown in FIG. 2B) <the area S _{51B at the} other end B (shown in FIG. 2C).

  As a result, the ejection pressure can be easily adjusted by operating the adjustment member 5, the work efficiency can be improved, and the adjustment member 5 can be easily processed, so that the cost of the cutting tool can be reduced. That is, the cutting tool is excellent in work efficiency at low cost, and has high cooling efficiency and can suppress sudden damage to the cutting blade.

Incidentally, the area S ₅₁ of the substantially vertical grooves 51 cross the axis L of the adjusting member 5 here, specifically, as follows. In the cross section of the groove 51 that is substantially perpendicular to the axis L, a part of the outer peripheral surface of the adjustment member 5 is cut away by the groove 5. As shown in FIG. 2 (b), a virtual outer peripheral surface (dotted line portion) and a groove portion 51 formed by virtually extending other outer peripheral surfaces from both ends of the notched portion (both ends of the inner surface of the groove portion 51). area of a portion surrounded by the inner surface of the, and the area S _51. As a simple measuring method, it can be measured by photographing the cross-sectional shape of the groove 51 substantially perpendicular to the axis L with a CCD camera or the like and analyzing the image.

Then, the area S ₅₁ forms a large structure at the other end from one end of the substantially vertical grooves 51 cross the axis L of the adjusting member 5, as shown in FIG. 2 (d), the axis L of the adjusting member 5 It is preferable that the area S ₅₁ in the cross section of the groove portion 51 substantially perpendicular to is gradually increased from one end to the other end. With such a configuration, the accuracy of the mechanism for adjusting the ejection pressure is improved. Therefore, in any of different processing conditions and processing forms, the effect of suppressing the cutting edge 2 from being lost suddenly is enhanced. In addition, since the processing of the groove portion 41 is easy, the cost of the adjustment component 5 can be further reduced.

  Furthermore, as shown in FIGS. 2B and 2C, the inner surface 511 of the groove 51 of the adjustment member 5 is preferably a concave curved surface. Thereby, the pressure applied to the groove 51 by the fluid can be dispersed and the groove 51 can be prevented from being lost. At this time, as shown in FIGS. 2B and 2C, the angles α1, α2 (one of the inner surface of the groove 51 and the outer peripheral surface of the adjustment member 5 are formed on both the one end surface side and the other end surface side. It is more desirable that the end face side; FIG. 2 (b)) and β1, β2 (the other end face side; FIG. 2 (c)) have an obtuse angle. Thereby, it can suppress that stress concentrates on the boundary part of the groove part 51 and the adjustment member 5, and a loss of an adjustment member occurs.

  At this time, as shown in FIGS. 2B and 2C, the inner surface 511 of the groove 51 desirably has a circular arc in a cross-section substantially perpendicular to the axis of the adjustment member. Accordingly, the groove 51 can be formed in the adjustment member 5 using a general tool such as a ball end mill or a solid end mill. Therefore, the cost of the adjustment member 5 can be reduced.

  Next, the adjustment mechanism of the fluid ejection pressure in this embodiment will be described with reference to FIG.

Fig.3 (a) is a principal part enlarged view of the cutting tool which makes the structure with a large jet pressure. As shown in FIG. 3A, one end side 5 </ b> A in which the area S _{51 of the} groove portion 5 of the adjustment member 5 is small is positioned substantially on the same plane as a part of the opening end of the second coolant hole 4. An adjustment member 5 is fitted and attached to the second coolant hole 4. With such a configuration, the hole through which the fluid is ejected from the cutting tool 1 becomes small as shown as a D1 portion (shown in a plan view) in FIG. Therefore, the ejection pressure of the fluid ejected from the cutting tool 1 increases.

On the other hand, FIG.3 (b) is a principal part enlarged view of the cutting tool which makes a structure with small ejection pressure. As shown in FIG. 3 (b), the second portion is such that the portion where the area S _{51 of the} groove portion 5 is larger than the one end side 5 </ b> A is substantially flush with a part of the opening end of the second coolant hole 4. The adjusting member 5 is fitted and attached to the coolant hole 4. With such a configuration, the hole through which the fluid is ejected from the cutting tool 1 becomes large as shown as a D2 portion (shown in a plan view) in FIG. Therefore, the ejection pressure of the fluid ejected from the cutting tool 1 is reduced.

  Thus, by adjusting the size of the area of the hole from which the fluid is ejected from the cutting tool 1 by moving the adjusting member 5 forward and backward along the axis L in the second coolant hole 4, the cutting tool The magnitude of the ejection pressure of the fluid ejected from 1 can be adjusted.

  Therefore, according to the present embodiment, the magnitude of the fluid ejection pressure can be adjusted by a simple operation such as the operation of the adjustment member 5 that is a screw member, so that the working efficiency can be improved and different processing conditions and Fine adjustment of the jet pressure according to the processing mode is possible, and the cooling efficiency can be improved in a wide range of processing conditions and processing modes.

  In the present embodiment, as shown in FIG. 1, a plurality of cutting edges 2 are provided in the circumferential direction of the cutting edge portion 12. In such a case, the second coolant holes 4 can be formed in a number corresponding to the cutting blade 2. Thereby, since the cutting heat generated in each cutting edge 2 at the time of cutting can be suitably cooled, the effect of suppressing breakage of the sudden cutting edge 2 is enhanced.

  Furthermore, it is desirable that a plurality of the groove portions 41 of the adjustment member 5 are provided in order to improve the cooling efficiency.

  Next, the cutting tool 21 by 2nd embodiment of this invention is demonstrated in detail using FIG. In FIG. 4, the same components as those in FIGS. 1 to 3 are denoted by the same reference numerals, and description thereof is omitted.

  As shown in FIG. 4, in the cutting tool 21 according to the second embodiment, the opening 41 of the second coolant hole 4 to which the adjusting member 5 is fitted and attached has an opening diameter that increases outward. The taper shape becomes. That is, the opening diameter on one end side A of the opening 41 of the second coolant hole 4 is larger than the opening diameter on the other end side B.

  With such a configuration, the opening of the groove functions as a surface that guides the fluid ejection direction, and the fluid ejection direction can be stabilized.

  As shown in FIG. 4, in the cross section including the axis L of the adjustment member 5, the angle θ41 formed by the opening 41 of the second coolant hole 4 and the axis L is such that the inner surface of the groove and the axis Is arranged so that the opening of the second coolant hole and the inner surface of the groove are substantially symmetrical with respect to the direction of fluid flow, and guides the direction of fluid discharge. This is desirable because the function of stabilizing the fluid ejection direction is enhanced, and the cooling efficiency can be further improved.

  Furthermore, the adjustment member is attached so that the one end is located on the distal end side of the cutting blade portion and the other end is located on the proximal end side of the cutting blade portion. Since the one having a smaller opening area is arranged on the tip side of the cutting blade portion, the function of adjusting the ejection pressure is enhanced, which is desirable.

  As shown in FIG. 4, the tapered shape of the opening 41 of the second coolant hole 4 is substantially the same as the inner surface of the groove 51 with respect to the axis L of the adjustment member 5 in the cross section passing through the axis L of the adjustment member 5. It is desirable to be symmetric. Thereby, the fluid can be ejected radially with respect to the axis L of the adjusting member 5, and the cooling effect is stabilized.

  Finally, a cutting method of a work material according to an embodiment of the present invention will be described by exemplifying a case where the cutting tool 1 is used.

  The cutting method of the work material by this embodiment is the proximity | contact process which brings the cutting tool 1 relatively close to a work material, the work material or the cutting tool 1 is rotated, and this cutting tool 1 is made into the surface of a work material. The cutting tool 1 provided with a cutting process for cutting the work material by bringing it into contact with and a separating process for moving the work material and the cutting tool 1 relatively away from each other is rotated to bring the work material and the cutting tool 1 into proximity. And a step of bringing the cutting edge 4 of the cutting tool 1 into contact with the surface of the work material to cut the work material, and a step of separating the cutting tool 1 from the work material.

  With such a configuration, the workpiece is cut using the cutting tool 1 having a high cooling efficiency, so that the temperature rise of the machined surface can be suppressed. As a result, it is possible to realize cutting with high finished surface accuracy. In particular, even in a machining mode in which cutting heat generated during cutting is large, such as heavy cutting, it is possible to effectively suppress an increase in the cutting edge temperature, and thus it is possible to realize cutting with excellent machining accuracy.

  In addition, in embodiment mentioned above, although the cutting tool formed by mounting | wearing with the cutting insert in which the cutting blade 2 was formed was illustrated, not only this but the cutting blade 2 was integrally formed in the cutting blade part 12. FIG. For example, the cutting blade may be brazed to the cutting blade portion.

  Moreover, although the end mill was illustrated in embodiment mentioned above, it can use suitably also for other rolling tools, such as not only this but a face mill.

  Furthermore, the cutting blade of the cutting tool is not limited to a configuration in which a plurality of cutting blades are provided in the circumferential direction on one end side of the cutting blade portion as in the above-described embodiment, and the number of cutting blades and the number of cutting blades are determined according to the processing conditions and processing forms. The arrangement in the blade portion can be selected as appropriate.

  Furthermore, in the above-described embodiment, an example in which one second coolant hole 4 is formed with respect to the cutting blade 2 is exemplified. The number of the 2nd coolant holes 4 provided corresponding to the cutting blade 2 can be selected suitably. In addition, when the some 2nd coolant hole 4 is formed with respect to the cutting blade 2, it is desirable that this some 2nd coolant hole 4 is provided corresponding to the cutting blade 2. FIG. Thereby, the fluid can be effectively supplied to the cutting blade whose temperature is likely to rise due to the cutting heat generated during cutting, and the cooling efficiency can be improved.

  In addition, although the 2nd coolant hole 4 of the cutting tool 1 of this embodiment is arrange | positioned with respect to the cutting blade 2 at the inner peripheral side of the cutting blade part 12, it is not restricted to this, A fluid is in the cutting blade 2. FIG. What is necessary is just to arrange | position so that it may be supplied.

  In the present embodiment, the cutting insert is mounted by being screwed to the insert mounting portion formed on the cutting edge portion 12. However, the mounting method of the cutting insert to the cutting edge portion 12 is not limited to this, and other clamping methods may be used. In the present embodiment, the cutting insert is directly mounted on the insert mounting portion formed on the cutting edge portion 12, but the cutting insert is mounted on the insert mounting portion via a sheet member or the like. It doesn't matter.

  Furthermore, as shown in the present embodiment, a concave chip pocket may be formed along the insert mounting portion to which the cutting insert is mounted. With such a configuration, the chip discharging property can be further improved. In addition, when the chip pocket is formed, forming the second coolant hole 4 in the inner surface of the chip pocket of the cutting blade portion 12 improves the chip discharging property and the cooling effect. This is more preferable.

  As mentioned above, although embodiment of this invention was illustrated, this invention is not limited to embodiment, It cannot be overemphasized that it can be made arbitrary, unless it deviates from the objective of invention.

BRIEF DESCRIPTION OF THE DRAWINGS (a) Whole side view including the partial cross section of the cutting tool 1 by 1st embodiment of this invention, (b) It is a bottom view. 2A is an overall perspective view, FIG. 2B is a top view, FIG. 2C is a bottom view, and FIG. 2D is a cross-sectional view including an axis L. FIG. FIG. 2A is an enlarged view of a main part of the cutting tool 1 of FIG. 1 configured to have a high jet pressure, and FIG. 2B is an enlarged view of a main part of a configuration having a low jet pressure. It is a principal part enlarged view of the cutting tool 21 by 2nd embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cutting tool 11 by 1st embodiment Tool main-body part 12 Cutting blade part 2 Cutting blade 3 1st coolant hole 4 2nd coolant hole 41 Opening part 5 Adjustment member 51 Groove part 21 Cutting tool by 2nd embodiment

Claims (11)

A cutting tool having a tool main body, and a cutting blade portion which is located on the tip side of the tool main body and at least one cutting blade is formed,
The tool body has a first coolant hole provided therethrough,
The cutting edge portion communicates with the first coolant hole, and is attached to a second coolant hole provided to open at a portion where the cutting edge does not exist, and an opening portion of the second coolant hole. And an adjustment member having a groove formed from one end to the other end,
A cutting tool characterized in that an area in a cross section of the groove portion substantially perpendicular to the axis of the adjusting member is larger at one end than at one end.   The cutting tool according to claim 1, wherein the second coolant hole is formed to extend toward the cutting edge.   The cutting tool according to claim 1 or 2, wherein an area in a cross section of the groove portion substantially perpendicular to the axis of the adjustment member gradually increases from one end to the other end.   The cutting tool according to any one of claims 1 to 3, wherein an inner surface of the groove portion of the adjusting member has a concave curved surface shape.   5. The cutting tool according to claim 4, wherein the inner surface of the groove portion of the adjustment member has a circular arc in a cross section substantially perpendicular to the axis of the adjustment member.   The cutting tool according to any one of claims 1 to 5, wherein the opening of the second coolant hole has a tapered shape with an opening diameter increasing outward.   In the cross section of the adjustment member including the axis of the adjustment member, the angle formed between the opening of the second coolant hole and the axis is substantially the same as the angle formed between the inner surface of the groove and the axis. The cutting tool according to claim 6, wherein the cutting tool is provided.   The said adjustment member is attached so that the said one end may be located in the front end side of the said cutting blade part, and the said other end may be located in the base end side of the said cutting blade part. Cutting tools.   The cutting tool according to claim 1, wherein a plurality of groove portions of the adjustment member are provided.   The plurality of second coolant holes are formed, and openings of the plurality of second coolant holes are arranged corresponding to the cutting blades. Cutting tools. A method of cutting a work material using the cutting tool according to claim 1,
A proximity step of relatively bringing the cutting tool closer to the work material;
A cutting step of rotating the work material or the cutting tool, and cutting the work material by bringing the cutting tool into contact with the surface of the work material;
And a separation step of relatively separating the work material and the cutting tool from each other.

Images