JP6462474B2 - CUTTING TOOL AND CUTTING PRODUCT MANUFACTURING METHOD USING THE SAME - Google Patents

Description

  This aspect relates to a cutting tool used for cutting and a method of manufacturing a cut product using the cutting tool.

  Conventionally, the cutting tool of patent documents 1-3 is known as an example of the cutting tool used for cutting. These cutting tools are so-called ball end mills. Each of the ball end mills described in Patent Documents 1 to 3 includes a rod-shaped tool body (holder) having a rotation shaft, and a cutting blade member attached to a tip portion of the tool body. The ball end mill described in Patent Document 1 has four inserts as cutting blade members. Further, the ball end mill described in Patent Document 2 has three inserts as cutting blade members. In the ball end mills described in Patent Documents 1 and 2, each insert is fixed to a holder with screws.

  Moreover, the ball end mill described in Patent Document 3 has a pair of plates as a cutting blade member. These plates have the same shape as each other and each has a slot for receiving the other. In the ball end mill described in Patent Document 3, the holder is constituted by two members, and the insert is fixed to the holder by screwing these members.

JP 2014-111286 A International Publication No.2012-118222 JP 2001-347414 A

  However, in the ball end mills described in Patent Documents 1 and 2, there are three or four cutting blade members, respectively, so that the number of parts is increased. Moreover, in the ball end mill described in Patent Document 3, a pair of plates each having a slot are engaged with each other. When cutting using a ball end mill, a load is applied from the front end side to the rear end side of the holder. Therefore, there is a problem that the plate may be cracked by the above load unless a sufficient thickness is secured between the tip portion and the slot in the plate located on the tip side.

  The present aspect has been made in view of the above problems, and an object thereof is to provide a cutting tool having good durability while suppressing the number of parts.

The cutting tool based on one aspect has the 1st slit and 2nd slit which cross | intersect each other in front-end | tip view at the front-end | tip part, the rod-shaped holder extended along a rotating shaft, and the flat plate shape inserted in the said 1st slit The first cutting blade member, a flat plate-shaped second cutting blade member inserted into the second slit, and the second screw for fixing the second cutting blade member to the holder . The first cutting blade member has a groove-shaped first cutout portion located at a tip end side and a portion intersecting with the second slit. The second cutting blade member has a groove-shaped second notch portion located at a portion intersecting the first slit on the rear end side, and the second notch portion is the first notch. It is mated with the part . Before Symbol depth of the first notch is greater than the depth of the second notch portion. Further, the second cutting blade member has a second screw hole that passes through the distal end side with respect to the second notch, and the second screw is inserted through the second screw hole.

  According to the cutting tool of the above aspect, since the cutting blade member is composed of the first cutting blade member and the second cutting blade member, the number of parts can be reduced. Moreover, the shape of the 1st cutting blade member and the 2nd cutting blade member is not the same, and the depth of a 1st notch part is larger than the depth of a 2nd notch part. Therefore, a large thickness is ensured between the tip portion and the second notch portion of the second cutting blade member located on the tip side of the cutting tool. Therefore, it becomes a cutting tool with good durability.

It is a perspective view which shows the cutting tool of one Embodiment. It is the enlarged view to which area | region A1 in the cutting tool shown in FIG. 1 was expanded. It is the front view which looked at the cutting tool shown in FIG. It is the side view which looked at the cutting tool shown in FIG. 3 from the B1 direction. It is sectional drawing which looked at the cutting tool shown in FIG. 3 in the C1-C1 cross section. It is sectional drawing which looked at the cutting tool shown in FIG. 3 in the C2-C2 cross section. It is a perspective view which shows the holder in the cutting tool shown in FIG. It is the front view which looked at the holder shown in Drawing 7 at the tip. It is the side view which looked at the holder shown in FIG. 8 from the B2 direction. It is a perspective view which shows the cutting blade member in the cutting tool shown in FIG. It is the front view which looked at the cutting-blade member shown in FIG. It is the side view which looked at the cutting blade member shown in FIG. 11 from the B3 direction. It is the side view which looked at the cutting blade member shown in FIG. 11 from the B4 direction. It is a perspective view which shows the 1st cutting blade member in the cutting blade member shown in FIG. It is the side view which looked at the 1st cutting blade member shown in FIG. It is a perspective view which shows the 2nd cutting blade member in the cutting blade member shown in FIG. It is the side view which looked at the 2nd cutting blade member shown in FIG. It is the schematic which shows 1 process of the manufacturing method of the cut workpiece of one Embodiment. It is the schematic which shows 1 process of the manufacturing method of the cut workpiece of one Embodiment. It is the schematic which shows 1 process of the manufacturing method of the cut workpiece of one Embodiment.

  Hereinafter, the cutting tool 1 of one embodiment will be described in detail with reference to the drawings. However, in the drawings referred to below, for the convenience of explanation, among the constituent members of the embodiment, only the main members necessary for explaining the present embodiment are shown in a simplified manner. Therefore, the cutting tool of the present invention may include any constituent member that is not shown in the drawings to which the present specification refers. Moreover, the dimension of the member in each figure does not faithfully represent the dimension of the actual component member, the dimension ratio of each member, or the like.

  As shown in FIG. 1, the cutting tool 1 of the present embodiment includes a rod-shaped holder 3 and two plate-shaped cutting blade members, and is suitably used as a ball end mill, for example. The cutting tool 1 includes a first cutting blade member 5 and a second cutting blade member 7 as two cutting blade members. Although the cutting tool 1 in this embodiment is a ball end mill, the cutting tool is not limited to the ball end mill. For example, an end mill such as a flat end mill or a radius end mill may be used. Further, it may be a cutting edge exchange type drill used for turning.

The holder 3 has a rod shape extending along the rotation axis O. The holder 3 rotates around the rotation axis O around the rotation axis O when the workpiece is cut to produce a cut product. The holder 3 in this embodiment has a first slit 9 and a second slit 11 at the tip. The first slit 9 and the second slit 11 intersect each other when viewed from the front end.

  The first slit 9 has a groove shape extending in a direction perpendicular to the rotation axis O, and is a space for inserting and fixing the flat plate-shaped first cutting blade member 5. The second slit 11 has a groove shape extending in a direction orthogonal to the rotation axis O, like the first slit 9, and is a space for inserting and fixing the flat plate-shaped second cutting blade member 7. Therefore, the groove width of the first slit 9 is substantially the same as the thickness of the flat plate-shaped first cutting blade member 5, and the groove width of the second slit 11 is that of the flat plate-shaped second cutting blade member 7. It is almost the same value as the thickness.

  The 1st slit 9 and the 2nd slit 11 should just cross | intersect mutually, and the inclination angle with respect to the 2nd slit 11 of the 1st slit 9 in a front end view is not specifically limited. However, as in the present embodiment, it is preferable that the first slit 9 and the second slit 11 are orthogonal to each other when viewed from the front end. This is because, as will be described later, variation in cutting resistance applied to each of the first cutting blade member 5 and the second cutting blade member 7 during cutting can be suppressed.

  Moreover, in the holder 3 of this embodiment, the 1st slit 9 and the 2nd slit 11 are located so that the rotating shaft O may be included in front end view. Thus, when the 1st slit 9 and the 2nd slit 11 are located, the dispersion | variation in cutting resistance in the 1st cutting blade member 5 and the dispersion | variation in cutting resistance in the 2nd cutting blade member 7 are demonstrated. Can be suppressed respectively.

The holder 3 in the present embodiment is gripped by a rotating spindle or the like of a machine tool (not shown) and is called a shank 13 and a body located on the tip side of the grip 13. The cutting part 15 called. The grip part 13 is a part designed according to the shape of a spindle or the like in a machine tool. The cutting part 15 is a part to which the first cutting blade member 5 and the second cutting blade member 7 are attached at the tip, and is a part having a main role in cutting of the work material.

  The arrow X1 indicates the rotation direction of the holder 3. Since the first cutting blade member 5 and the second cutting blade member 7 are attached to the cutting portion 15 in the holder 3, the first slit 9 and the second slit 11 are provided in the cutting portion 15 in the present embodiment. ing.

  Examples of the material of the holder 3 include metals such as stainless steel and titanium, or cemented carbide. The cemented carbide includes, for example, an alloy containing WC (tungsten carbide) and Co (cobalt) as a binder, and an additive such as TiC (titanium carbide) or TaC (tantalum carbide). An alloy is mentioned.

  The 1st cutting blade member 5 and the 2nd cutting blade member 7 are members which cut a work material at the time of cutting, and are also called cutting inserts, respectively. The 1st cutting blade member 5 and the 2nd cutting blade member 7 in this embodiment are flat plate shape, and have the surrounding side surface located between a pair of flat surfaces and a pair of flat surfaces, respectively. The first cutting blade member 5 is inserted into the first slit 9 of the holder 3, and the second cutting blade member 7 is inserted into the second slit 11 of the holder 3. At this time, the first cutting blade member 5 and the second cutting blade member 7 are detachably attached to the holder 3, respectively.

The first slit 9 and the second slit 11 intersect each other when viewed from the front end. Therefore, the first cutting blade member 5 and the second cutting blade member 7 intersect each other in the front end view. As is apparent from FIG. 3, the second cutting blade member 7 is located on the front end side of the first cutting blade member 5 in the region where the first slit 9 and the second slit 11 intersect in the front end view. . However, in the present embodiment, the entire second cutting blade member 7 is not positioned on the distal end side than the entire first cutting blade member 5.

  Specifically, the first cutting blade member 5 in the present embodiment has a groove-shaped first cutout portion 17. The first notch portion 17 is located at the front end side of the first cutting blade member 5 and at a portion intersecting with the second slit 11. The second cutting blade member 7 has a groove-shaped second notch 19. The second notch 19 is located on the rear end side of the second cutting blade member 7 and at a portion intersecting the first slit 9.

  The first cutout portion 17 and the second cutout portion 19 are fitted to each other in a so-called cruciform cutout configuration. Therefore, the second cutout portion 19 is located on the front end side with respect to the first cutout portion 17 only in a portion where the first cutting blade member 5 and the second cutting blade member 7 intersect each other in the front end view.

  In the holder 3 of the present embodiment, the first slit 9 and the second slit 11 are positioned so as to include the rotation axis O in the front end view. Therefore, the portion where the first cutting blade member 5 and the second cutting blade 23 overlap is positioned so as to include the rotation axis O in the front end view. Accordingly, the first notch portion 17 and the second notch portion 19 are positioned so as to include the rotation axis O in the front end view.

  Furthermore, in this embodiment, the shape of the 1st cutting blade member 5 and the 2nd cutting blade member 7 is not the same, and the depth D1 of the 1st notch part 17 is more than the depth D2 of the 2nd notch part 19. FIG. Is also big. Therefore, a large thickness is ensured between the distal end portion of the second cutting blade member 7 located on the distal end side of the cutting tool 1 and the second notch portion 19.

  Specifically, in the present embodiment, the tip position of the first cutting blade member 5 and the tip position of the second cutting blade member 7 are substantially the same position, and the depth D1 of the first notch portion 17 is the first. The depth is larger than the depth D2 of the two notches 19. And the thickness from the 2nd notch part 19 in the 2nd cutting blade member 7 to the front-end | tip is larger than the thickness from the 1st notch part 17 in the 1st cutting blade member 5 to the rear end.

  The tip portion of the second cutting blade member 7 contacts the work material. Therefore, a load is applied to the distal end portion of the second cutting blade member 7 toward the rear end side. At this time, if the thickness between the front end portion of the second cutting blade member 7 and the second notch portion 19 is small, the second cutting blade member 7 may be cracked. However, the durability of the cutting tool 1 can be improved by ensuring a large thickness between the tip portion of the second cutting blade member 7 and the second notch 19.

  Since the cutting tool 1 in the present embodiment is a ball end mill, at least the outer peripheral edge of the first cutting blade member 5 and the second cutting blade member 7 has a convex curve shape. Specifically, when the first cutting blade member 5 and the second cutting blade member 7 are viewed from the flat surface side, respectively, as shown in FIGS. 15 and 17, at least the outer peripheral edge on the tip side is a convex curve shape. It has become. However, since the 1st cutting blade member 5 has the 1st notch part 17 located in the front end side, the outer periphery in the area | region except this 1st notch part 17 becomes convex curve shape. .

  As described above, when the cutting tool 1 is a flat end mill, the outer peripheral edge on the tip side when the first cutting blade member 5 and the second cutting blade member 7 are viewed from the flat surface side is the rotation axis O. It becomes the linear shape extended in the orthogonal direction.

  Cutting blades are provided on the peripheral side surfaces of the first cutting blade member 5 and the second cutting blade member 7. Specifically, the peripheral side surface has a ridge line protruding in a direction away from the pair of flat surfaces between the ridge lines where the pair of flat surfaces and the peripheral side surface intersect, and this ridge line portion functions as a cutting edge. Can do.

  In the present embodiment, the peripheral side surface of the first cutting blade member 5 has a ridge line between a pair of flat surfaces, and the first cutting edge 21 is formed on this ridge line portion. The peripheral side surface of the second cutting blade member 7 also has a ridge line between the pair of flat surfaces, and the second cutting edge 23 is formed at the ridge line portion. The workpiece is cut by the first cutting edge 21 and the second cutting edge 23.

  In addition, the cutting blade does not need to be formed only on the peripheral side surfaces of the first cutting blade member 5 and the second cutting blade member 7. For example, the ridgeline provided on the peripheral side surface is connected to the ridgeline where the pair of flat surfaces and the peripheral side surface intersect, and a part of the ridgeline where the pair of flat surfaces and the peripheral side surface intersect may be used as a cutting blade. Good.

  The cutting blade formed on the peripheral side surface of the second cutting blade member 7 has a linear shape extending so as to pass through the rotation axis O in the front end view. In other words, a pair of linear second cutting blades 23 extending from the rotation axis O toward the outer peripheral surface of the cutting tool 1 in the front end view are formed.

  The first cutting blade member 5 has a first notch portion 17 located on the distal end side, and a pair of first cutting blades 21 are formed with the first notch portion 17 therebetween as viewed from the distal end. Yes. The pair of first cutting edges 21 in the present embodiment are each linear when viewed from the tip, and are positioned on one virtual straight line passing through the rotation axis O.

  As described above, the first cutting blade member 5 in the present embodiment has two first cutting blades 21, and the second cutting blade member 7 in the present embodiment has two second cutting blades 23. doing. That is, the cutting tool 1 of this embodiment has four cutting edges. That is, the cutting tool 1 of the present embodiment is not configured to have four cutting blade members each having one cutting blade, but is composed of two cutting blade members each having two cutting blades.

  In the case of a configuration having four cutting blade members, a screw for fixing each cutting blade member is required, so four screws are required. However, in the cutting tool 1 of this embodiment, since the cutting blade member is constituted by the two of the first cutting blade member 5 and the second cutting blade member 7, the number of screws necessary for the number of cutting blades. The number is small, and the number of parts can be reduced.

  In the cutting tool 1 of this embodiment, as already shown, the first slit 9 and the second slit 11 are orthogonal to each other when viewed from the front end. Therefore, the first cutting blade member 5 and the second cutting blade member 7 are also orthogonal to each other in the front end view. Furthermore, in this embodiment, the 1st cutting blade 21 and the 2nd cutting blade 23 are located so that it may mutually orthogonally cross in a front end view. Therefore, variation in cutting resistance applied to each of the first cutting blade member 5 and the second cutting blade member 7 can be suppressed.

  The first cutting edge member 5 in the present embodiment has a flat first rear end face 25 on the rear end side. Moreover, the 2nd cutting blade member 7 in this embodiment has the flat 2nd rear end surface 27 in the rear end side. When the first cutting blade member 5 is inserted into the first slit 9, the first rear end face 25 abuts on the first slit 9 on the rear end side of the first cutting blade member 5. Further, when the second cutting blade member 7 is inserted into the second slit 11, the second rear end face 27 abuts on the second slit 11 on the rear end side of the second cutting blade member 7.

  During the cutting of the work material, a cutting load is applied to the first cutting blade member 5 and the second cutting blade member 7 from the front end side toward the rear end side. At this time, the first rear end face 25 and the second rear end face 27 which are the surfaces in contact with the first slit 9 and the second slit 11 on the rear end side in the first cutting edge member 5 and the second cutting edge member 7 are respectively flat. Due to the surface shape, the first cutting blade member 5 and the second cutting blade member 7 can be stably held by the holder 3.

  Further, in the present embodiment, the first rear end surface 25 and the second rear end surface 27 are orthogonal to the rotation axis O, respectively. Thus, when the 1st rear end surface 25 and the 2nd rear end surface 27 are comprised, the 1st cutting blade member 5 and the 2nd cutting blade member 7 can be hold | maintained with the holder 3 more stably.

  The first cutting blade member 5 is fixed to the holder 3 with a first screw 29. Further, the second cutting blade member 7 is fixed to the holder 3 by the second screw 31. Specifically, the first cutting blade member 5 in the present embodiment has a first screw hole 33 through which the first screw 29 is inserted, and the second cutting blade member 7 in the present embodiment is the second screw 31. Has a second screw hole 35 through which is inserted.

  In addition, the holder 3 in this embodiment has a third screw hole 37 and a fourth screw hole 39. The third screw hole 37 is a hole that extends so as to be positioned on the same axis as the first screw hole 33 when the first cutting blade member 5 is attached, and through which the first screw 29 is inserted. The fourth screw hole 39 is a hole through which the second screw 31 is inserted so as to be positioned on the same axis as the second screw hole 35 when the second cutting blade member 7 is attached.

  That is, in the present embodiment, the first cutting blade member 5 is fixed to the holder 3 by the first screw 29 inserted through the first screw hole 33 of the first cutting blade member 5 and the third screw hole 37 of the holder 3. The second cutting blade member 7 is fixed to the holder 3 by the second screw 31 inserted through the second screw hole 35 of the second cutting blade member 7 and the fourth screw hole 39 of the holder 3.

  In the present embodiment, the first cutting blade member 5 is fixed to the holder 3 by the first screw 29, and the second cutting blade member 7 is fixed to the holder 3 by the second screw 31, It is not limited to such a configuration. For example, the 1st cutting blade member 5 and the 2nd cutting blade member 7 may be fixed to the holder 3 only with the 2nd screw 31, without providing the 1st screw | thread 29. FIG.

  In the present embodiment, the second notch portion 19 of the second cutting blade member 7 is located on the distal end side of the cutting tool 1 with respect to the first notch portion 17 of the first cutting blade member 5. Therefore, the first cutting blade member 5 is sandwiched between the holder 3 and the second cutting blade member 7. Therefore, if the second cutting blade member 7 is fixed to the holder 3 by the second screw 31, both the first cutting blade member 5 and the second cutting blade member 7 can be fixed to the holder 3. It is.

  In the present embodiment, the second screw hole 35 of the second cutting blade member 7 passes through the distal end side with respect to the second notch portion 19. A portion of the second cutting blade member 7 located on the rear end side of the bottom of the second notch 19 is divided into two regions by the second notch 19. Therefore, when the 2nd screw hole 35 is located in the back end side rather than the bottom of the 2nd notch part 19 in the 2nd cutting-blade member 7, a 2nd screw hole is provided in either one of the said 2 area | regions. 35 will be located.

  In such a case, since the 2nd screw hole 35 will be located in the place where it deviated, fixation of the 2nd cutting blade member 7 may become unstable. However, when the second screw hole 35 passes through the distal end side with respect to the second notch portion 19, the second cutting blade member 7 can be stably fixed to the holder 3.

  For the same reason, the first screw hole 33 of the first cutting blade member 5 in the present embodiment passes through the rear end side with respect to the first notch portion 17. Furthermore, the 1st cutting blade member 5 in this embodiment protrudes in the back end side rather than the 2nd cutting blade member 7 in the state which attached the 1st cutting blade member 5 and the 2nd cutting blade member 7 to the holder 3. A portion 41 is provided. A first screw hole 33 is provided in the protruding portion 41.

  When the first cutting blade member 5 has the protruding portion 41 described above and the first screw hole 33 is provided in the protruding portion 41, the rear end and the first notch in the first cutting blade member 5 are provided. The wall thickness with the part 17 can be ensured. Therefore, the durability of the first cutting blade member 5 can be enhanced.

  The 2nd screw hole 35 in this embodiment inclines with respect to the 2nd slit 11 in front-end | tip see-through | perspective. This is because the first cutting blade member 5 and the second cutting blade member 7 are fitted in the first cutout portion 17 and the second cutout portion 19, so that the first cutting blade member 5 is avoided. This is because the two screws 31 must be inserted into the second slit 11. In the present embodiment, like the second screw hole 35, the fourth screw hole 39 of the holder 3 is also inclined with respect to the second slit 11 in the distal end perspective.

  On the other hand, the 1st screw hole 33 in this embodiment is provided in the protrusion part 41 which protrudes in the back end side rather than the 2nd cutting blade member 7. FIG. Therefore, it is possible to provide the first screw hole 33 so as to be orthogonal to the first slit 9 when seen through the tip. Since the first screw hole 33 is orthogonal to the first slit 9, the first cutting blade member 5 can be stably fixed to the holder 3.

  Since the first cutting blade member 5 is stably fixed to the holder 3, the second cutting blade member in which a load applied to the first cutting blade member 5 is fitted to the first cutting blade member 5 in some cases. The possibility of being transmitted to 7 can also be suppressed. Accordingly, it may be possible to stably fix the second cutting blade member 7 to the holder 3. In the present embodiment, similarly to the first screw hole 33, the third screw hole 37 of the holder 3 is also inclined with respect to the first slit 9 as seen through the tip.

  In order to stably fix the first cutting blade member 5 to the holder 3, it is desirable that the first screw hole 33 is orthogonal to the flat surface of the first cutting blade member 5. Further, in order to stably fix the second cutting blade member 7 to the holder 3, it is desirable that the second screw hole 35 is orthogonal to the flat surface of the second cutting blade member 7. However, since the second screw 31 must be inserted into the second slit 11 so as to avoid the first cutting blade member 5, in the cutting tool 1 of the present embodiment, the second screw hole 35 is the second slit in the distal end perspective. 11 is inclined.

  On the other hand, the cutting tool 1 according to the present embodiment stably fixes the first cutting blade member 5 and the second cutting blade member 7 to the holder 3, and therefore the first screw hole in the side view orthogonal to the front end view. 33 and the second screw hole 35 extend in a direction orthogonal to the rotation axis O, respectively. That is, simply speaking, the first screw hole 33 and the second screw hole 35 are orthogonal to the rotation axis O.

  Accordingly, the first screw hole 33 can be orthogonal to the flat surface of the first cutting blade member 5, and the second screw hole 35 can be orthogonal to the flat surface of the second cutting blade member 7. Can be approached. For this reason, the first cutting blade member 5 and the second cutting blade member 7 can be more stably fixed to the holder 3.

  As already indicated, the second screw 31 must be inserted into the second slit 11 so as to avoid the first cutting blade member 5. Therefore, in the present embodiment, the inner diameter of the second screw hole 35 is smaller than the inner diameter of the first screw hole 33. By setting the inner diameter of the second screw hole 35 to a relatively small value, the second slit 11 can be easily formed so as to avoid the first cutting blade member 5. In the present embodiment, like the second screw hole 35, the inner diameter of the fourth screw hole 39 of the holder 3 is also a relatively small value.

On the other hand, in the present embodiment, the first screw hole 33 is provided in the protruding portion 41. Therefore, it is not necessary to reduce the inner diameter of the first screw hole 33 in order to avoid the second cutting blade member 7. By setting the inner diameter of the first screw hole 33 to a relatively large value, the outer diameter of the first screw 29 can be increased. Thereby, the first cutting blade member 5 can be more stably fixed to the holder 3. In the present embodiment, similarly to the first screw hole 33, the inner diameter of the third screw hole 37 of the holder 3 is also a relatively large value.

  Next, the manufacturing method of the cut workpiece of one Embodiment is demonstrated using drawing.

The cut workpiece is produced by cutting the workpiece 101. The manufacturing method of the cut workpiece in the present embodiment includes the following steps. That is,
(1) a step of rotating the cutting tool 1 typified by the above embodiment around the rotation axis O;
(2) contacting the work material 101 with the first cutting blade member and the second cutting blade member in the rotating cutting tool 1;
(3) a step of separating the cutting tool 1 from the work material 101;
It has.

  More specifically, first, as shown in FIG. 18, the cutting tool 1 is relatively moved closer to the workpiece 101 by rotating the cutting tool 1 around the rotation axis O and moving it in the X2 direction. Next, as shown in FIG. 19, the first cutting blade member and the second cutting blade member in the cutting tool 1 are brought into contact with the work material 101 to cut the work material 101. Specifically, the first cutting blade in the first cutting blade member and the second cutting blade in the second cutting blade member are brought into contact with the work material 101 as cutting blades. Then, as shown in FIG. 20, the cutting tool 1 is moved away from the work material 101 by moving the cutting tool 1 in the X2 direction.

  In the present embodiment, the workpiece 101 is fixed and brought close to the workpiece 101 in a state where the cutting tool 1 is rotated around the rotation axis O. In FIG. 19, the work material 101 is cut by bringing the cutting blade of the rotating cutting tool into contact with the work material 101. In FIG. 20, the cutting tool 1 is rotated away from the work material 101.

  In the cutting in the manufacturing method of this embodiment, the cutting tool 1 is brought into contact with the work material 101 by moving the cutting tool 1 in each step, or the cutting tool 1 is separated from the work material 101. However, as a matter of course, it is not limited to such a form.

  For example, the work material 101 may be brought close to the cutting tool 1 in the step (1). Similarly, the work material 101 may be moved away from the cutting tool 1 in the step (3). In the case of continuing the cutting process, the state in which the cutting tool 1 is rotated may be maintained, and the process of bringing the cutting edge of the cutting tool into contact with a different part of the work material 101 may be repeated.

  Note that representative examples of the material of the work material 101 include aluminum, carbon steel, alloy steel, stainless steel, cast iron, and non-ferrous metal.

DESCRIPTION OF SYMBOLS 1 ... Cutting tool 3 ... Holder 5 ... 1st cutting blade member 7 ... 2nd cutting blade member 9 ... 1st slit 11 ... 2nd slit 13 ... Holding part 15 ... cutting part 17 ... first notch part 19 ... second notch part 21 ... first cutting edge 23 ... second cutting edge 25 ... first rear end face 27 Second rear end surface 29 ... first screw 31 ... second screw 33 ... first screw hole 35 ... second screw hole 37 ... third screw hole 39 ... fourth screw Hole 41 ... Projection 101 ... Work material

Claims (9)

A rod-shaped holder having a first slit and a second slit intersecting with each other in the front end view and extending along the rotation axis;
A flat plate-shaped first cutting blade member inserted into the first slit;
A plate-shaped second cutting blade member inserted into the second slit ;
A cutting tool comprising the second screw for fixing the second cutting blade member to the holder ,
The first cutting blade member has a first notch in a groove shape located at a tip side and a portion intersecting with the second slit,
The second cutting blade member has a groove-shaped second notch portion located at a portion intersecting the first slit on the rear end side, and the second notch portion is the first notch. Is mated with
The depth of the first notch portion much larger than the depth of the second notch,
The second cutting blade member has a second screw hole that passes through a distal end side with respect to the second notch,
The cutting tool , wherein the second screw is inserted through the second screw hole . The first cutting blade member has a protruding portion that protrudes toward the rear end side from the second cutting blade member, and a first screw hole provided in the protruding portion ,
The cutting tool according to claim 1 , wherein the first screw for fixing the first cutting blade member to the holder is inserted into the first screw hole . The second screw hole is inclined with respect to the second slit in perspective see-through,
3. The cutting tool according to claim 2 , wherein the first screw hole is orthogonal to the first slit in front end see-through. The cutting tool according to claim 2 or 3 , wherein an inner diameter of the second screw hole is smaller than an inner diameter of the first screw hole. The cutting tool according to any one of claims 2 to 4 , wherein the first screw hole and the second screw hole are orthogonal to the rotation axis. The cutting tool according to any one of claims 1 to 5 , wherein the first slit and the second slit are orthogonal to each other in a front end view. The first cutting blade member has a flat first rear end surface on the rear end side, and the second cutting blade member has a flat second rear end surface on the rear end side. The cutting tool according to any one of claims 1 to 6 . The cutting tool according to claim 7 , wherein the first rear end surface and the second rear end surface are orthogonal to the rotation axis. Rotating the cutting tool according to any one of claims 1 to 8 around the rotation axis;
Contacting the work piece with the first cutting blade member and the second cutting blade member in the rotating cutting tool;
And a step of separating the cutting tool from the work material.

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