JP5780891B2 - Cutting device and method of manufacturing cut product using the same - Google Patents

Description

  The present invention relates to a cutting tool, a cutting apparatus, and a method for manufacturing a cut product using the cutting tool.

  2. Description of the Related Art Conventionally, for example, Patent Document 1 discloses a throw-away reamer having blade portions with cutting edges formed at both ends, and the end portion of the blade portion is fixed to a shank portion that is separate from the blade portion. What has a structure is disclosed.

  However, in the reamer in which the blade portion is fixed to the separate shank portion in this way, the shape from one end to the other end is symmetrical, so when cutting the work material using the blade portion on one end side In addition, since the other end side is a fixed end, blurring of the blade portion on the one end side which is a free end is amplified, and there is a possibility that the finishing accuracy of the hole of the work material is reduced. Moreover, when the cutting force is applied to the blade portion on the other end side fixed by the shank portion, the blade portion on the other end side may be damaged.

  Therefore, there has been a demand for a cutting tool, a cutting device, and a method of manufacturing a cut product using the same, which have both excellent hole workability and excellent breakage resistance.

Japanese Utility Model Publication No. 1-84920

A cutting device according to a first embodiment of the present invention includes a cutting tool having a cylindrical main body portion that includes a first cutting portion, a second cutting portion, and a shank portion, and extends along a rotation axis direction, and the cutting tool. A holder that holds the shank portion of the first cutting portion or the second cutting portion in contact with the abutting portion and fixes the shank portion, wherein the first cutting portion is the main body portion. A first flat surface that is located at one end in the direction of the rotation axis in the direction of the rotation axis and is orthogonal to the rotation axis and located at the one end, and a first cutting edge that is positioned around the first flat surface The second cutting part is located on the other end side in the rotation axis direction of the main body part, and is located on the other end part and orthogonal to the rotation axis. A second flat surface, and a second cutting edge located around the second flat surface; The shank portion is located between the first cutting portion and the second cutting portion, passes through a midpoint in the rotation axis direction of the main body portion, and is connected to the rotation shaft. When reversing with reference to an orthogonal reference line, the first cutting edge before reversing and the second cutting edge after reversing exist at different positions, and the first cutting part and the second cutting part Either one protrudes from the holder, and the first flat surface or the second flat surface in either one of the first cutting portion and the second cutting portion comes into contact with the contact portion .

A cutting apparatus according to a second embodiment of the present invention includes a cutting tool having a cylindrical main body portion that includes a first cutting portion, a second cutting portion, and a shank portion and extends along a rotation axis direction, and the cutting tool. A holder that holds the shank portion of the first cutting portion or the second cutting portion in contact with the abutting portion and fixes the shank portion, wherein the first cutting portion is the main body portion. A first flat surface that is located at one end in the direction of the rotation axis in the direction of the rotation axis and is orthogonal to the rotation axis and located at the one end, and a first cutting edge that is positioned around the first flat surface A first reamer having a first groove corresponding to the first cutting edge, wherein the second cutting part is located on the other end side in the rotational axis direction of the main body part, and A second flat surface positioned at the other end and orthogonal to the rotation axis, and the second A second reamer having a second cutting edge located around the carrier surface and a second groove corresponding to the second cutting edge, wherein the shank part includes the first cutting part and the second cutting part. The shape of the first groove is different from the shape of the second groove in a side view, and either the first cutting part or the second cutting part protrudes from the holder. The first flat surface or the second flat surface in one of the first cutting portion and the second cutting portion is in contact with the contact portion .

  The cutting device which concerns on one Embodiment of this invention is equipped with said cutting tool, The holder which fixes the said shank part of the said cutting tool, Either one of the said 1st cutting part and the said 2nd cutting part Protrudes from the holder.

  A method for manufacturing a cut product according to an embodiment of the present invention includes: a step of rotating the cutting device around a rotation axis of the holder; and the first cutting portion of the rotating cutting device and the rotating device. A step of bringing any one of the second cutting parts into contact with the work material; and a step of relatively separating the work material and the cutting device.

  According to the cutting tool according to each embodiment of the present invention, when reversing with reference to a reference line that passes through the midpoint of the main body portion in the rotation axis direction and is orthogonal to the rotation axis, Since the first cutting edge and the second cutting edge of the second cutting part after reversal are at different positions, amplification of blurring that may occur between the first cutting part and the second cutting part is suppressed or reduced. Therefore, it is possible to combine excellent hole workability and excellent breakage resistance.

It is a side view which shows the cutting tool which concerns on the 1st Embodiment of this invention. It is a figure which shows the cutting tool of FIG. 1, (a) is a side view which expands and shows a 1st cutting part, (b) is a front view on the 1st cutting part side, (c) is a 2nd cutting part side. Front view, (d) is a cross-sectional view taken along line XX in FIG. It is a sectional side view showing the cutting device concerning the embodiment of the present invention. It is a figure which shows the cutting tool which concerns on the 2nd Embodiment of this invention, (a) is a side view, (b) is a front end figure by the side of the 1st cutting part, (c) is a front end figure by the side of the 2nd cutting part. (D) is sectional drawing cut | disconnected by the YY line of (a), (e) is sectional drawing cut | disconnected by the ZZ line of (a). It is a figure which shows the cutting tool which concerns on other embodiment of this invention, (a) is a side view which shows the reamer from which the twist direction of a groove | channel differs in the one end part side and the other end part side, (b) is one end part side FIG. 4 is a side view showing a reamer having a different diameter on the other end side, and FIG. 5C is a side view showing a cutting tool having a drill on one end side and a reamer on the other end side. It is a figure which shows the manufacturing method of the cut workpiece which concerns on the 1st Embodiment of this invention, (a) is a figure which shows the process of rotating the cutting device around the rotating shaft of a holder, (b) It is rotating. It is a figure which shows the process of making the 1st cutting part of a cutting device contact a workpiece, (c) The figure which shows the process of separating a workpiece and a cutting tool relatively. It is a figure which shows the manufacturing method of the cut workpiece which concerns on the 2nd Embodiment of this invention, (a) is a figure which shows the process of rotating the cutting device around the rotating shaft of a holder, (b) It is rotating. It is a figure which shows the process of making the 1st cutting part of a cutting device contact a workpiece, (c) The figure which shows the process of separating a workpiece and a cutting tool relatively. It is a figure which shows the manufacturing method of the cut workpiece which concerns on the 3rd Embodiment of this invention, (a) is a figure which shows the process of rotating the cutting device around the rotating shaft of a holder, (b) It is rotating. It is a figure which shows the process of making the 1st cutting part of a cutting device contact a workpiece, (c) The figure which shows the process of separating a workpiece and a cutting tool relatively.

<Cutting tools>
(First embodiment)
Hereinafter, a first embodiment of a cutting tool according to the present invention will be described in detail with reference to FIGS. 1 and 2 by taking a reamer as an example.

  As shown in FIG. 1, the cutting tool 1 according to the present embodiment can cut the workpiece 100 by using each of the one end 1 a side and the other end 1 b side of the main body 10 as a reamer. Double-headed reamer 1 (hereinafter also simply referred to as a reamer). The reamer 1 includes a columnar main body 10, a first cutting part 11 that is positioned at one end of the main body 10 in the direction of the rotation axis S and has a first cutting edge 11 a, and rotation of the main body 10. Located at the other end in the axis S direction and located between the second cutting part 12 having the second cutting edge 12 a and the front 1 cutting part 11 and the second cutting part 12 of the main body part 10. And a shank portion 13. Moreover, as shown in FIG. 1, the length L1 of the 1st cutting part 11 and the length L2 of the 2nd cutting part 12 are the same in the rotating shaft S direction by a side view.

In the reamer 1 of the present embodiment, for example, the outer diameter φ of the main body portion 10 is 0.2 mm to 20 mm, the lengths L1 and L2 of the cutting portions 11 and 12 are 1 mm to 250 mm, and the length of the rotating shaft S (cutting) When the length from the blades 11 and 12 to the end of the grooves 11c and 12c) is L and the diameter (outer diameter of the cutting blades 11 and 12) is D, L / D may be 1 to 30. As the work material 100, for example, steel materials such as steel and cast iron, and non-ferrous metal materials such as aluminum alloys can be suitably used.

  As shown in FIG. 1, the shank 13 is positioned at the central portion 1 c of the main body portion 10 in the direction of the rotation axis S, and has a role of fixing the reamer 1 to the holder 21 by being gripped by the holder 21. It is. The shank portion 13 is appropriately designed according to the shape of the holder 21.

  As shown in FIG. 1 and FIG. 2, the first cutting part 11 is a part having a main role in the cutting of the work material 100, and is located at one end 1 a of the main body part 10 in the direction of the rotation axis S. The first cutting edge 11a is provided.

  Further, as shown in FIG. 2 (b), the first cutting part 11 has a flat surface 11X perpendicular to the rotation axis S in the central region in the front end view from the one end 1a side, and the periphery of the flat surface 11X. The 1st cutting edge 11a is located in this. Moreover, as shown to Fig.2 (a), the 1st groove | channel 11c is formed in the outer periphery so that it may correspond to the 1st cutting blade 11a toward the shank part 13 side from the one end part 1a. The primary purpose of the first groove 11c is to discharge chips generated from the first cutting edge 11a. The first cutting part 11 of the present embodiment as described above has a so-called right blade left-handed configuration. In the present embodiment, the first groove 11c is continuous with the first cutting edge 11a via a third configuration such as the first rake face 11b.

  In addition, the outer periphery of the 1st cutting part 11 is shown by the dotted line P in FIG.2 (b). In this embodiment, the shape of the 1st cutting part 11 is a column shape. That is, in the cross section perpendicular to the rotation axis S, the first cutting part 11 has a diameter D1a at one end 1a as shown in FIG. 2B, and other than the one end 1a as shown in FIG. 2C. When the diameter of the part is D1b, D1a and D1b have a relationship of D1a = D1b. Moreover, the diameter D1 of the 1st cutting part 11 is constant over the cross section perpendicular | vertical to the rotating shaft S from the one end part 1a to the shank part 13 side.

  As shown in FIG. 2B, the first cutting edge 11 a is formed at one end 1 a of the first cutting part 11 with four blade parts 11 a 1. The four blade portions 11a1 are positioned so as to be 90 ° rotationally symmetric with respect to the rotation axis S (axis line) of the first cutting portion 11. That is, the four blade portions 11a1 are four-fold symmetrical with respect to the rotation axis S. With such an arrangement, it is possible to improve the straight running stability when the work material 100 is processed. Moreover, at the time of a cutting process, the chip | tip formed with the 1st cutting edge 11a is discharged | emitted to the shank part 13 side through the 1st rake face 11b and the 1st groove | channel 11c. That is, the chips formed by each blade portion 11a1 are separately discharged to the shank portion 13 side through the corresponding first groove 11a. In addition, the arrow a shown by FIG. 2 has shown the rotation direction of the 1st and 2nd cutting parts 11 and 12 (it is the same below).

  Further, as shown in FIG. 2 (b), a first margin is formed in a region where the first groove 11c is not formed in the outer periphery of the first cutting portion 11 and in front of the first cutting edge 11a in the rotation direction. 11d exists. That is, the first margin 11d is a portion corresponding to the outer periphery of the first cutting part 11 in a cross-sectional view and has an arc shape. In this specification, “cross-sectional view” refers to a cross section perpendicular to the rotation axis S. In the present embodiment, the diameter (outer diameter) of the reamer 1 is the same as the size of the first margin 11d.

In the reamer 1 of this embodiment, the rotation direction of the first cutting edge 11a and the twist direction of the first groove 11c are the same. Therefore, the twist direction of the first groove 11c, that is, the twist direction of the first margin 11d is the same as the rotation direction of the first cutting edge 11a. Thereby, when cutting using the first cutting edge 11a, the first margin 11d obtains an effect of smoothing by pressing the inner wall 101a of the machining hole 101 of the work material 100, that is, a so-called burnishing effect. Is possible. In particular, when the processing hole 101 is a through-hole penetrating the work material 100, even if chips are generated by the first cutting edge 11 a as the work material 100 is processed, Of these, the chips are discharged from the opening opposite to the insertion port of the reamer 1, which is preferable because the burnishing effect by the first margin 11d can be more efficiently exhibited while suppressing the influence of the chip discharge.

  The 2nd cutting part 12 has the 2nd cutting blade 12a while being located in the other end part 1b of the rotating shaft S direction of the main-body part 10, as shown in FIG. In the present embodiment, the basic configuration of the second cutting unit 12 is the same as that of the first cutting unit 11, and the description thereof is omitted.

  The reamer 1 according to the present embodiment will be described with reference to FIG. 1 when the reamer 1 is reversed with reference to a reference line L passing through the midpoint C in the direction of the rotation axis S of the main body 10 and orthogonal to the rotation axis S. The first cutting edge 11a before reversal as shown in FIG. 2 (b) and the second cutting edge 12a after reversal as shown in FIG. 2 (c) exist at different positions. According to this, amplification of blurring that may occur between the first cutting unit 11 and the second cutting unit 12 when processing using either the first cutting unit 11 or the second cutting unit 12 is suppressed or Can be reduced. Therefore, it is possible to have both excellent hole workability and excellent breakage resistance.

  As an example of the above-mentioned different positions, as shown in FIGS. 2B and 2C, when viewed from the one end 1a side, the first cutting edge 11a before reversal and the second cutting after reversal. The blade 12a is preferably present at a rotationally symmetric position with respect to the rotation axis S. In this case, in the double-headed reamer, the first cutting part 11 and the second cutting part 12 can have the same cutting edge shape, and can have the above-described excellent hole workability and excellent breakage resistance. It becomes.

  In this regard, in the present embodiment, the first cutting edge 11a has a plurality of blade portions 11a1, and the second cutting edge 12a has a plurality of blade portions 12a1. When viewed from the one end 1a side, the plurality of blade portions 11a1 of the first cutting blade 11a before reversing and the plurality of blade portions 12a1 of the second cutting blade 12a after reversing each have a rotation axis S. It exists so that it may exist in the rotationally symmetrical position made into the reference | standard.

  On the other hand, in the present embodiment, as described above, the first cutting part 11 has the first groove 11c corresponding to the first cutting edge 11a, and the second cutting part 12 corresponds to the second cutting edge 12a. As shown in FIG. 1, the shape of the first groove 11c is different from the shape of the second groove 12c in a side view. Thus, even by designing the groove shape, it is possible to combine the above-described excellent hole workability and excellent breakage resistance.

  In the present embodiment, as shown in FIG. 1, the twist angle of the first groove 11c and the twist angle of the second groove 12c are the same. As described above, the first cutting portion 11 of the present embodiment has a so-called right-blade left-twist configuration, and the twist angle is set to, for example, 5 degrees to 15 degrees from the viewpoint of obtaining the above-described burnishing effect more efficiently. It is preferred that

  In this embodiment, as shown in FIGS. 1 and 2, when viewed from the end portions 1a and 1b in the direction of the rotation axis S, the twist direction of the first groove 11c and the twist direction of the second groove 12c Are the same.

  In the present embodiment, as shown in FIGS. 2B and 2C, the diameter D1 of the first cutting portion 11 and the diameter D2 of the second cutting portion 11 in the cross section orthogonal to the rotation axis S Are the same.

(Second Embodiment)
Next, a second embodiment of the cutting tool according to the present invention will be described with reference to FIG. The basic configuration is the same as that of the cutting tool according to the first embodiment, and will be described with reference to FIGS. 1 and 2 as appropriate.

  The cutting tool 1 of the present embodiment is located at one end of the main body 10 and the main body 10 in the direction of the rotation axis S, and corresponds to the first cutting edge 11 a and the first cutting edge 11. A first cutting part 11 having a groove 11c and a second cutting edge 12a located at the other end of the main body part 10 in the direction of the rotation axis S and having a second groove 12c corresponding to the second cutting edge 12a and the second cutting edge 12a. 2 and a shank portion 13 located between the first cutting portion 11 and the second cutting portion 12 in the main body portion 10, and in the side view, the shape of the first groove 11 c and the first shape The shape of the two grooves 12c is different.

  Even in the reamer 1 having such a configuration, the same effects as those of the reamer 1 according to the first embodiment described above can be obtained. That is, when the shape of the first groove 11c is different from the shape of the second groove 12c, when the first cutting part 11 and the second cutting part 12 are used for processing, Since it is possible to suppress or reduce the amplification of blurring that may occur with the second cutting portion 12, it is possible to combine excellent hole workability and excellent breakage resistance.

  In the reamer 1 of the present embodiment, as shown in FIG. 4, the first cutting edge 11a has at least one or more blade parts 11a1, the second cutting edge 12a has at least one or more blade parts 12a1, The number of blade portions 11a1 of the first cutting edge 11a is different from the number of blade portions 12a1 of the second cutting blade 12a. Also by this, the above-mentioned blur amplification can be suppressed or reduced. Specifically, the first cutting part 11 has six blade parts 11a1 as shown in FIG. 4B, and the second cutting part 12 has four blade parts as shown in FIG. 4C. 11a1.

  Other configurations are the same as those of the reamer 1 according to the first embodiment described above, and thus the description thereof is omitted. That is, for the configuration that is not described, the same configuration as that of the reamer 1 according to the first embodiment can be adopted as appropriate.

<Cutting device>
Next, a cutting apparatus according to an embodiment of the present invention will be described with reference to FIG. The case where the reamer 1 of the first embodiment described above is used as a cutting tool will be described in detail.

  As shown in FIG. 3, the cutting device 20 of the present embodiment includes the reamer 1 according to each of the above-described embodiments and a holder 21 that fixes the shank portion 13 of the reamer 1, and includes the first cutting unit 11 and the second cutting unit 11. The reamer 1 is fixed so that one of the cutting parts 12 protrudes from the holder 21.

  That is, in the reamer 1, the first cutting part 11 and the shank part 13 are inserted into the reamer holding parts 21 a and 21 b of the holder 21. Then, the shank portion 13 is fixed using fixing means 21 b such as a collet chuck of the holder 21, and the flat surface 11 </ b> X of the first cutting portion 11 is brought into contact with the contact portion 21 a of the holder 21. By abutting the flat surface 11X of the first cutting part 11 with the abutting part 21a of the holder 21, adjustment of the protruding amount of the second cutting part 12 is unnecessary, and the tool can be easily adjusted. In this way, the cutting device 20 of the present embodiment is configured. The holder 21 is not particularly limited as long as it is one normally used by those skilled in the art. For example, various machines such as a machining center are used.

  As a modified example, as shown in FIG. 3 (b), in either one of the first cutting portion 11 and the second cutting portion 12, the end of the cutting portion 11, 12 that does not protrude from the holder 21, The parts 1 a and 1 b may not be in contact with the contact part 21 a of the holder 21. In this case, it is easy to adjust the protrusion amount of the second cutting portion 12.

  According to the cutting device 20 shown in FIGS. 3A and 3B as described above, the second cutting portion 12 protruding from the holder 21 in the cutting tool 1 is connected to the first cutting portion 12. In relation, it is possible to suppress or reduce the amplification of blur as described above.

<Manufacturing method of cut product>
Next, an embodiment of a method for manufacturing a cut product according to the present invention will be described with reference to FIG. The case where the reamer 1 according to the above-described first embodiment is used will be described in detail as an example.

  The manufacturing method of the cut workpiece according to the embodiment of the present invention includes the step of rotating the cutting device 20 around the rotation axis S of the holder 21, the first cutting unit 11 and the first cutting portion of the rotating cutting device 20. There are provided a step of bringing either one of the two cutting parts 12 into contact with the work material 100 and a step of relatively separating the work material 100 and the cutting tool 1.

  Specifically, the following steps (i) to (iv) are provided.

(I) The process of arrange | positioning the cutting device 20 above the workpiece 100 in which the processed hole 101 is formed.

    (Ii) Next, the step of rotating the reamer 1 of the cutting device 20 in the direction of the arrow a about the rotation axis S and moving the reamer 1 in the X direction to approach the work material 100.

  This step may be performed, for example, by fixing the work material 100 on the table of the cutting device 20 to which the reamer 1 is attached, and bringing the work material 100 closer to the work material 100 in a rotated state. In this step, the work material 100 and the reamer 1 need only be relatively close to each other. For example, the work material 100 may be made close to the reamer 1, contrary to the above example.

(Iii) Next, when the reamer 1 is further brought closer to the work material 100, the first cutting edge 11 a or the second cutting edge 12 a of the rotating reamer 1 is replaced with the inner wall 101 a of the machining hole 101 of the work material 100. The process of making it contact. Accordingly, it is possible to remove burrs remaining in the processed hole 101 of the work material 100 and to smooth the inner wall 101a of the processed hole 101. In this step, the reamer 1 having a diameter larger than that of the machining hole 101 of the work material 100 may be used to perform cutting so as to widen the hole diameter of the machining hole 101.

    (Iv) A step of moving the reamer 1 in the Y direction and separating it from the work material 100.

  Note that, similarly to the above-described step (ii), also in this step, the work material 100 and the reamer 1 may be separated from each other. For example, the work material 100 may be separated from the reamer 1.

By passing through the steps as described above, it is possible to suppress or reduce the amplification of blurring that may occur between the first cutting part 11 and the second cutting part 12, so that the inner wall 101a of the machining hole 101 is smoothed. That is, while being able to exhibit the outstanding hole workability, it becomes possible to combine the outstanding fold resistance. Therefore, it is possible to stably cut the inner wall 101a of the processing hole 101 of the work material 100 over a long period of time.

  In addition, when performing the cutting of the workpiece 100 as described above a plurality of times, for example, when smoothing the inner wall 101a with respect to the plurality of processed holes 101, while maintaining the state where the reamer 1 is rotated, What is necessary is just to repeat the process which makes the 1st cutting edge 11a and the 2nd cutting edge 12a of the reamer 1 contact the inner wall 101a of the processing hole 101 located in the different location of the workpiece 100. FIG.

  As mentioned above, although some embodiment which concerns on this invention was illustrated, this invention is not limited to embodiment mentioned above, It cannot be overemphasized that it can be made arbitrary, unless it deviates from the summary of this invention. . Various modifications are illustrated below, but these modifications can be combined with each other or with any of the above-described embodiments.

  For example, instead of the above-described embodiment, as shown in FIG. 5A, when viewed from the end portions 1a and 1b in the direction of the rotation axis S, the twist direction of the first groove 11c and the second groove 12c It is good also as a structure from which a twist direction differs. Thereby, for example, since it has the 1st cutting part 11 with a comparatively high chip discharge | emission property, and the 2nd cutting part 12 with a comparatively high burnishing effect, it uses properly according to the kind of the target process by one reamer 1. Can be performed. The 1st cutting part 11 here is the structure of what is called a right blade right-handed twist, and the twist angle of the 1st groove | channel 11c is set to 5-30 degree from the viewpoint of obtaining the above-mentioned burnishing effect more efficiently, for example. It is preferred that In addition, when the rotation direction of the 1st and 2nd cutting blades 11 and 12 and the twist direction of the 1st groove | channel and the 2nd groove | channels 11c and 12c are respectively the same, the work material 100 is processed and the cut workpiece is manufactured. Is as shown in FIG. According to this, the discharge property of the generated chips can be improved.

  Moreover, as shown in FIG.5 (b), in the cross section orthogonal to the rotating shaft S, it is good also as a structure from which the diameter D1 of the 1st cutting part 11 and the diameter D2 of the 2nd cutting part 11 differ. Thereby, for example, the inner wall can be smoothed with respect to two types of machining holes formed in the work material by one reamer 1. Furthermore, as another method of use, pre-processing is performed using the cutting portion with the smaller diameter, and then the diameter of the processing hole obtained by the pre-processing is increased using the cutting portion with the larger diameter. It becomes possible to smooth the inner wall of the hole.

  Moreover, in the above-mentioned embodiment, although the cutting tool 1 which can cut the workpiece 100 using each of the one end part 1a side and the other end part 1b side of the main-body part 10 as a reamer was shown, Instead, as shown in FIG. 5C, a cutting tool in which one of the first cutting part 11 and the second cutting part 12 is a reamer and the other is a drill may be used. Thereby, for example, a machining hole is formed using the first cutting part (drill) 11 with one cutting tool 1, and then the first cutting part (drill) 11 using the second cutting part (reamer) 12. It is possible to increase the diameter of the processed hole obtained in step 1 or to smooth the inner wall of the processed hole. FIG. 8 shows a method of manufacturing a cut workpiece having a processed hole (through hole) 101 by processing the workpiece 100 using the first cutting portion (drill) 11 of the cutting tool 1 according to this example. Street. In addition, about the method of smoothing the inner wall 101a of the processing hole (through-hole) 101 obtained in this way using the 2nd cutting part (reamer) 12, it is as having shown in FIG. 6 or FIG.

  Further, instead of twisting at least one of the first groove 11c of the first cutting part 11 and the second groove 12c of the second cutting part 12 in a spiral manner as in the above-described embodiment, the first groove 11c and the second groove 11c. A configuration that extends parallel to the direction of the rotation axis S without twisting at least one of the grooves 12c, that is, a so-called straight blade configuration may be employed.

The twist angle of the first groove 11c may be different from the twist angle of the second groove 12c. Thereby, it becomes possible to employ | adopt the usage method according to the main processing objectives among chip discharge | emission property and inner wall smoothness.

  Moreover, it is good also as a structure from which the length L1 of the 1st cutting part 11 and the length L2 of the 2nd cutting part 12 differ in the rotating shaft S direction by a side view. By designing the length of the cutting portion in this way, it is possible to combine the above-described excellent hole workability and excellent breakage resistance.

DESCRIPTION OF SYMBOLS 1 Cutting tool 1a One end part 1b Other end part 1c Center part 10 Main body part 11 1st cutting part 11a 1st cutting edge 11a1 Blade part 11b 1st rake face 11c 1st groove | channel 11d 1st margin 11X 1st flat surface L1 length D1 Diameter 12 Second cutting portion 12a Second cutting edge 12a1 Blade portion 12b Second rake surface 12c Second groove 12d Second margin 12X Second flat surface L2 Length D2 Diameter 13 Shank portion S Rotating shaft 20 Cutting device 21 Holder 21a Contact portion 21b Fixing means 100 Work material 101 Processing hole 101a Inner wall

Claims (13)

A cutting tool having a cylindrical main body portion that includes the first cutting portion, the second cutting portion, and the shank portion and extends along the rotation axis direction;
A cutting device comprising a holder that holds the shank portion of the cutting tool and fixes either the first cutting portion or the second cutting portion in contact with the contact portion,
The first cutting part is located on one end part side in the rotation axis direction of the main body part, and is located on the one end part and orthogonal to the rotation axis, and the first flat surface A first reamer having a first cutting edge located around
The second cutting portion is located on the other end portion side of the main body portion in the rotation axis direction, is located on the other end portion, and is perpendicular to the rotation axis, and the second A second reamer having a second cutting edge located around the flat surface,
The shank part is located between the first cutting part and the second cutting part,
The first cutting blade before reversal and the second cutting blade after reversal are different when reversing with reference to a reference line that passes through the midpoint of the main body in the rotation axis direction and is orthogonal to the rotation axis. Exists in position,
Either one of the first cutting part and the second cutting part protrudes from the holder, and the first flat surface or the second flat surface in either one of the first cutting part and the second cutting part is the Cutting device that contacts the contact portion .   The first cutting edge before the reversal and the second cutting edge after the reversal are present at rotationally symmetric positions with respect to the rotation axis when viewed from the one end side. The cutting apparatus according to 1. The first cutting blade has at least one or more blade portions, the second cutting blade has at least one or more blade portions,
The cutting device according to claim 1, wherein the number of the blade portions of the first cutting blade is different from the number of the blade portions of the second cutting blade. The first cutting portion is a first groove corresponding to the first cutting edge, and a first groove located forward of the first groove in the rotation direction of the first cutting edge and on the outer periphery of the main body. A margin, and
The second cutting portion is a second groove corresponding to the second cutting edge, and a second groove located forward of the second groove in the rotation direction of the second cutting edge and on the outer periphery of the main body. And at least one of the rotation direction of the first cutting edge and the twisting direction of the first groove, and the rotation direction of the second cutting edge and the twisting direction of the second groove are the same. The cutting apparatus in any one of Claims 1-3. The first cutting part further has a first groove corresponding to the first cutting edge, and the second cutting part further has a second groove corresponding to the second cutting edge,
The cutting device according to any one of claims 1 to 3, wherein a shape of the first groove is different from a shape of the second groove in a side view.   The first cutting part further includes a first rake face that connects the first cutting edge and the first groove, and the second cutting part connects the second cutting edge and the second groove. The cutting device according to claim 4, further comprising a second rake face.   The cutting device according to any one of claims 4 to 6, wherein a twist angle of the first groove and a twist angle of the second groove are different.   The cutting device according to any one of claims 4 to 7, wherein a twist direction of the first groove and a twist direction of the second groove are different when viewed from each end in the rotation axis direction.   The cutting device according to any one of claims 1 to 8, wherein a length of the first cutting portion and a length of the second cutting portion are different in a direction of the rotation axis in a side view.   The cutting device according to any one of claims 1 to 9, wherein a diameter of the first cutting portion and a diameter of the second cutting portion are different from each other in a cross section orthogonal to the rotation axis. A cutting tool having a cylindrical main body portion that includes the first cutting portion, the second cutting portion, and the shank portion and extends along the rotation axis direction;
A cutting device comprising a holder that holds the shank portion of the cutting tool and fixes either the first cutting portion or the second cutting portion in contact with the contact portion,
The first cutting part is located on one end part side in the rotation axis direction of the main body part, and is located on the one end part and orthogonal to the rotation axis, and the first flat surface A first reamer having a first cutting edge located around and a first groove corresponding to the first cutting edge,
The second cutting portion is located on the other end portion side of the main body portion in the rotation axis direction, is located on the other end portion, and is perpendicular to the rotation axis, and the second A second reamer having a second cutting edge located around a flat surface and a second groove corresponding to the second cutting edge;
The shank part is located between the first cutting part and the second cutting part,
In side view, the shape of the first groove is different from the shape of the second groove,
Either one of the first cutting part and the second cutting part protrudes from the holder, and the first flat surface or the second flat surface in either one of the first cutting part and the second cutting part is the Cutting device that contacts the contact portion .   The first cutting blade before reversal and the second cutting blade after reversal are the same when passing through a midpoint in the rotation axis direction of the main body and reversing with reference to a reference line orthogonal to the rotation axis The cutting device according to claim 11, wherein the cutting device is in position. The step of rotating the cutting device according to any one of claims 1 to 12 around a rotation axis of the holder;
Contacting either the first cutting part or the second cutting part of the rotating cutting device with the work material;
A step of relatively separating the work material and the cutting device;
A method for manufacturing a cut product.