JP5882846B2 - Reamer, cutting tool, and method of manufacturing a cut product using the same - Google Patents

Description

  The present invention relates to a reamer, a cutting tool, and a manufacturing method of a cut workpiece using the reamer.

  Conventionally, the coating reamer of patent document 1 is known as a drill used for the cutting of a workpiece. The reamer described in Patent Document 1 is made of a metal member such as a cemented carbide. Moreover, in order to lengthen the tool life of such a reamer, the metal member is covered with a coating layer.

JP-A-5-345221

  When the metal member is covered with the coating layer, the tool life of the metal member constituting the reamer body can be extended. However, a coating layer made of a material such as carbide, nitride and oxide as described in Patent Document 1 generally has a lower thermal conductivity than a metal member. When the coating layer is provided, since the thermal conductivity of the coating layer is relatively smaller than the thermal conductivity of the metal member, it becomes difficult to sufficiently release the cutting heat generated during the reaming process to the outside. there is a possibility. For this reason, the wear of the cutting edge easily proceeds, and the accuracy of the reamer processing is lowered. Therefore, it becomes difficult to form a highly accurate hole.

  The present invention has been made in view of the above problems, and it is an object of the present invention to provide a reamer capable of performing reamer processing with high accuracy while having a good tool life.

Reamer according to one aspect of the present invention is a rod-shaped having an axis of rotation, the outer peripheral surface, an end surface positioned at one end side, and an inclined surface located between the end face and the outer peripheral surface, super A main body portion made of a hard alloy ; a groove portion formed from the inclined surface to the outer peripheral surface; a cutting edge formed at an intersection of the inner surface of the groove portion and the inclined surface; titanium carbide, titanium nitride, charcoal A portion made of titanium nitride or alumina, excluding a region adjacent to the inclined surface in the groove, and
And a coating layer disposed so that at least a part of the end surface is exposed from the inclined surface to the end surface.

  In the reamer of the said aspect, since the coating layer which coat | covers the inclined surface of a main-body part is provided, the cutting blade lifetime of a reamer can be lengthened. In addition, the entire surface of the main body is not covered with the coating layer, but an end face located on one end side of the main body is exposed from the coating layer. At the time of reamer processing, since this end face hardly contacts the work material, it is possible to prevent the tool life of the reamer from being lowered even if it is not covered with the coating layer. Moreover, since this end surface is in a position close to the cutting edge where cutting heat is generated during cutting, cutting heat generated during cutting is easily transmitted. Therefore, this heat is transmitted through the inside of the main body, and is easily radiated from the end face of one end to the outside of the tool.

It is a side view which shows the reamer of the 1st Embodiment of this invention. It is a front view of the reamer shown in FIG. It is the enlarged side view which expanded the area | region A in the reamer shown in FIG. It is a front view which shows the 1st modification of a reamer shown in FIG. It is the enlarged front view which expanded the area | region B in the reamer shown in FIG. FIG. 5 is an enlarged side view in which a region corresponding to FIG. 3 in the reamer shown in FIG. 4 is enlarged. It is a front view which shows the 2nd modification of the reamer shown in FIG. FIG. 8 is an enlarged side view in which a region corresponding to FIG. 3 in the reamer shown in FIG. 7 is enlarged. It is a front view which shows the reamer of the 2nd Embodiment of this invention. It is the enlarged front view which expanded the area | region C in the reamer shown in FIG. FIG. 10 is an enlarged side view in which a region corresponding to FIG. 3 in the reamer shown in FIG. 9 is enlarged. It is side sectional drawing which shows the cutting tool of one Embodiment of this invention. It is a side view which shows 1 process of the manufacturing method of the cut workpiece of one Embodiment of this invention. It is a side view which shows 1 process of the manufacturing method of the cut workpiece of one Embodiment of this invention. It is a side view which shows 1 process of the manufacturing method of the cut workpiece of one Embodiment of this invention.

<Cutting insert>
Hereinafter, the reamer of each embodiment of the present invention will be described in detail with reference to the drawings. However, in the drawings referred to below, for convenience of explanation, among the constituent members of the embodiment, only the main members necessary for explaining the present invention are shown in a simplified manner. Accordingly, the reamer of the present invention may include any component not shown in the drawings to which the present specification refers. Moreover, the dimension of the member in each figure does not represent the dimension of an actual structural member, the dimension ratio of each member, etc. faithfully.

  As shown in FIGS. 1-3, the reamer 1 of 1st Embodiment has the rod-shaped main-body part 3 which has the rotating shaft S by which a rotation direction is shown by X. As shown in FIG. Specifically, the main body 3 of the present embodiment has a cylindrical shape. Therefore, when viewed from the side in a direction perpendicular to the rotation axis S, the main body 3 has an elongated shape extending along the rotation axis S. In addition, as shown in FIG. 2, when viewed from the front in a direction parallel to the rotation axis S, the outer periphery of the main body 3 is circular.

  The main body 3 is constituted by a cutting part 7 located on one end side and having a groove part 5 formed on the outer periphery, and a shank part 9 located on the other end side of the cutting part 7. Yes. The workpiece 201 can be cut using one end side of the main body 3. Specifically, the main body 3 includes an outer peripheral surface 11, an end surface located on one end side (hereinafter also referred to as a first end surface 13 for convenience), and between the first end surface 13 and the outer peripheral surface 11. Is provided with an inclined surface 15.

  As shown in FIG. 1, the shank portion 9 is located on the other end side in the direction of the rotation axis S of the main body portion 3, and is held by the holder 103 of the cutting tool 101 to hold the reamer 1 in the holder 103. It has a role to fix to. The shape of the shank portion 9 is appropriately designed according to the shape of the holder 103.

  The first end surface 13 is located on one end side of the main body 3 and is a flat surface orthogonal to the rotation axis S. As shown in FIG. 2, when the main body 3 is viewed from the front, the inclined surface 15 and the groove 5 are located outside the first end surface 13.

  The inclined surface 15 is located between the first end surface 13 and the outer peripheral surface 11 and is inclined with respect to the first end surface 13 and the outer peripheral surface 11. The inclined surface 15 is a portion that bites the work material 201 during cutting and mainly performs a cutting action, and functions as a so-called biting portion.

  The size of the main body 3 is appropriately set depending on the size of the processing hole 203 of the work material 201 during the reamer processing. For example, the outer diameter φ of the main body 3 is 0.2 mm to 20 mm, The length may be set to 2 mm to 500 mm.

  Examples of the material of the main body 3 include cemented carbide. As the composition of the cemented carbide, for example, WC-Co produced by adding cobalt (Co) powder to tungsten carbide (WC) and sintering, and WC-Co obtained by adding titanium carbide (TiC) to WC-Co. There is WC-TiC-TaC-Co in which tantalum carbide (TaC) is added to TiC-Co or WC-TiC-Co.

  A groove portion 5 is formed from the inclined surface 15 to the outer peripheral surface 11 on the outer periphery on the one end side of the main body portion 3. In addition, said outer periphery means the surface comprised by the outer peripheral surface 11 and the inclined surface 15. FIG. The groove 5 is mainly intended to discharge chips generated from the first cutting edge 17. In the reamer 1 of the present embodiment, a plurality of groove portions 5 are formed. The plurality of groove portions 5 are located at four positions so as to be 90 ° rotationally symmetric with respect to the rotation axis S of the main body portion 3. That is, the four groove portions 5 are symmetrical with respect to the rotation axis S with respect to the rotation axis S.

  One end of each of the plurality of grooves 5 in the present embodiment is open to the first end surface 13. The groove portion 5 is formed from the inclined surface 15 to the outer peripheral surface 11. The groove portion 5 is formed from one end portion to the other end portion on the inclined surface 15, and is formed on one end portion side on the outer peripheral surface 11. The portion on the other end side in the groove portion 5 is configured such that the width and the depth become smaller as approaching the other end portion of the main body portion 3.

  Further, the groove portion 5 of the present embodiment is formed in a state of being twisted with respect to the rotation axis S of the main body portion 3. Specifically, the groove portion 5 of the present embodiment has a so-called right blade left-handed configuration. A so-called straight blade configuration in which the extending direction of the groove portion 5 is parallel to the rotation axis S may be employed, but even if the groove portion 5 is formed in a twisted state with respect to the rotation axis S as shown in FIG. good.

  When the groove portion 5 is formed in a state twisted with respect to the rotation shaft S, when the reaming is performed, the generated chips are easily flown along the groove portion 5 and easily discharged to the outside. What is necessary is just to set suitably the twist angle of the groove part 5 with respect to the rotating shaft S according to the magnitude | size of the chip, or the rotational speed of the reamer 1. FIG. For example, the twist angle is set to about 5 ° to 45 °.

  A first cutting edge 17 is formed at the intersection of the inner surface of the groove 5 and the inclined surface 15. Specifically, a first cutting edge 17 is formed at a portion of the intersection of the inner surface of the groove portion 5 and the inclined surface 15 and facing forward in the rotational direction of the reamer 1. The reamer 1 of this embodiment includes four groove portions 5. Therefore, the first cutting edge 17 is formed in the intersection part of the inner surface of each groove part 5, and the inclined surface 15, respectively. That is, the reamer 1 of the present embodiment has four first cutting edges 17.

  As described above, the plurality of grooves 5 are positioned so as to be 90 ° rotationally symmetric with respect to the rotation axis S of the main body 3. Therefore, the four first cutting edges 17 are also positioned so as to be 90 ° rotationally symmetric with respect to the rotation axis S of the main body 3. Thus, by arrange | positioning so that the several 1st cutting blade 17 may become rotationally symmetrical, the linear advance stability of the cutting tool 101 at the time of processing the workpiece 201 can be improved.

  In the reamer 1 of the present embodiment, the first cutting edge 17 is formed at the intersection of the inner surface of the groove 5 and the inclined surface 15, but not only the first cutting edge 17 but also the groove A second cutting edge 19 may be formed at the intersection of the inner surface of 5 and the outer peripheral surface 11.

  A portion of the groove portion 5 located on one end side and continuing to the first cutting edge 17 functions as a so-called rake face. At the time of cutting, chips formed by the first cutting edge 17 are discharged to the shank portion 9 side through a portion functioning as a rake face in the groove portion 5. Chips formed by each of the plurality of blade portions including the first cutting blade 17 and the second cutting blade 19 are separately discharged to the shank portion 9 side through the corresponding groove portions 5.

  A region between the plurality of grooves 5 in the outer peripheral surface 11 is a first margin 21. The first margin 21 is a portion corresponding to the outer periphery of the main body 3 in a cross-sectional view orthogonal to the rotation axis S, and has an arc shape. In the present embodiment, the diameter (outer diameter) of the reamer 1 is the same as the size of the first margin 21. In other words, the radius of the reamer 1 is the same as the radius of curvature of the first margin 21.

  In the reamer 1 of the present embodiment, the rotation direction of the first cutting edge 17 and the twist direction of the groove portion 5 are the same. Therefore, the twisting direction of the groove 5, that is, the twisting direction of the first margin 21 is the same as the rotation direction of the first cutting edge 17. Thereby, when cutting using the first cutting edge 17, the second cutting edge 19 has an effect of smoothing by pressing the inner wall of the processing hole 203 of the work material 201, a so-called burnishing effect. Can be obtained.

  In particular, when the processing hole 203 is a through-hole penetrating the work material 201, even if chips are generated by the first cutting edge 17 as the work material 201 is processed, Of these, chips are discharged from the opening opposite to the insertion port of the reamer 1. Therefore, the burnishing effect by the first margin 21 can be more efficiently exhibited while suppressing the influence due to chip discharge.

  The main body 3 in the reamer 1 of the present embodiment is partially covered with the coating layer 25. The covering layer 25 covers at least a part of the inclined surface 15 and the first end surface 13. That is, the covering layer 25 is disposed so that at least a part of the first end face 13 is exposed.

  In the reamer 1 of the present embodiment, the first cutting edge 17 is formed at one end, and no cutting edge is formed at the other end. However, the reamer 1 of the present invention is not limited to such a configuration, and may have a configuration in which a cutting blade different from the first cutting blade 17 is formed at the other end.

  The covering layer 25 is provided to protect the main body 3. Specifically, the entire inclined surface 15 is covered with the covering layer 25 in order to protect the inclined surface 15 that bites the work material 201 during cutting. As a result, the tool life of the reamer 1 can be extended. In particular, in order to protect the first cutting edge 17 that cuts the work material 201 during reaming, it is desirable that the region along the first cutting edge 17 on the inclined surface 15 is covered.

Examples of the material of the covering layer 25 include titanium carbide (TiC), titanium nitride (TiN), titanium carbonitride (TiCN), and alumina (Al ₂ O ₃ ). The covering layer 25 is formed, for example, by coating the main body 3 with the above-described material using a chemical vapor deposition (CVD) method or a physical vapor deposition (PVD) method.

On the other hand, these materials have a lower thermal conductivity than a metal material such as a cemented carbide constituting the main body 3. Therefore, it becomes difficult to radiate the cutting heat generated during the reamer processing to the outside through the main body portion 3 as compared with the case where the coating layer 25 is not provided. However, the covering layer 25 in the reamer 1 of the present embodiment is not covered on the entire first end face 13 and is disposed so that at least a part of the first end face 13 is exposed.

  Since the 1st end surface 13 exists in the position near the 1st cutting blade 17 in which cutting heat produces with cutting, the heat generated at the time of cutting is easy to be transmitted. Therefore, since this heat is transmitted from the one end side to the other end side in the main body 3, the heat can be radiated well to the outside. Further, at the time of the reamer processing, the first end face 13 hardly comes into contact with the work material 201, so that it is possible to prevent the tool life of the reamer 1 from being reduced even if it is not covered with the coating layer 25. .

  As shown in FIG. 2, when the entire first end face 13 is exposed from the coating layer 25, heat generated during the cutting process is easily released to the outside from the first end face 13. Therefore, heat dissipation can be further enhanced. On the other hand, the peripheral edge portion of the first end face 13 is close to the inclined surface 15 that bites the work material 201 during cutting and the first cutting edge 17 that cuts the work material 201. Therefore, in order to stably protect the inclined surface 15 and the first cutting edge 17, the peripheral edge portion of the first end surface 13 is covered with the coating layer 25 as shown in FIGS. preferable. That is, it is preferable that the central portion of the first end surface 13 including the intersection with the rotation axis S is exposed from the coating layer 25 and the peripheral portion is covered with the coating layer 25.

  In particular, in the reamer 1 of the present embodiment, the plurality of first cutting edges 17 are positioned so as to be 90 ° rotationally symmetric with respect to the rotation axis S of the main body 3. Therefore, since the central portion including the intersection with the rotation axis S in the first end face 13 is exposed from the coating layer 25, the cutting heat generated from each first cutting edge 17 is balanced with the first end face. It becomes easy to radiate heat from 13.

  Moreover, as shown in FIGS. 4-8, it is preferable that the area | region 5a adjacent to the inclined surface 15 in the groove part 5 is coat | covered with the coating layer 25 at least. This is because the first cutting edge 17 is formed at the intersecting portion of the inclined surface 15 and the groove 5, so that the first cutting edge 17 is stably protected. As shown in FIGS. 7 to 8, the entire groove portion 5 may be covered with the covering layer 25, but as shown in FIGS. 4 to 6, a region 5 a adjacent to the inclined surface 15 in the groove portion 5 is partially formed. The covering layer 25 may be covered.

  When partially covered along the inclined surface 15, a part of the groove 5 is exposed from the coating layer 25. Therefore, it becomes easy to radiate the heat generated during the reamer processing to the outside in the exposed portion.

  In addition, as shown in FIGS. 5, 6 and 8, it is preferable that the region 11 a adjacent to the inclined surface 15 in the outer peripheral surface 11 is partially covered with the coating layer 25. This is because the portion 11a of the outer peripheral surface 11 close to the inclined surface 15 is covered with the coating layer 25, whereby the inclined surface 15 can be protected more stably.

  In the first modification of the reamer 1 of the present embodiment shown in FIGS. 5 and 6, a region 11 a in which the coating layer 25 is adjacent to the inclined surface 15 on the outer peripheral surface 11 so as to have a constant width along the inclined surface 15. Is provided. Further, in the second modification of the reamer 1 of the present embodiment shown in FIG. 8, one of the outer peripheral surfaces 11 is set so that the distance from the first end surface 13 in the direction parallel to the rotation axis S is constant. A coating layer 25 is provided on the end side.

In order to protect the inclined surface 15, the entire outer peripheral surface 11 may be covered with the coating layer 25, but the region 11 a adjacent to the inclined surface 15 on the outer peripheral surface 11 is partially covered with the coating layer 25. If so, there are also the following advantages.

  When cutting is performed using the reamer 1, the first cutting edge 17 is worn with use. Therefore, in order to use the reamer 1 effectively, when the first cutting edge 17 is worn, a regenerating operation of the reamer 1 is performed. Specifically, when the first cutting edge 17 is worn, one end side of the main body 3 is ground or cut so as to include the first cutting edge 17. Next, the inclined surface 15 and the first cutting edge 17 are formed again on one end side of the remaining portion of the main body 3 to adjust the tip shape of the main body 3. Finally, the main body 3 is covered with the coating layer 25.

  When the entire outer peripheral surface 11 is covered with the covering layer 25, the outer diameter of the reamer 1 including the covering layer 25 is gradually increased because the main body 3 is covered with the covering layer 25 every time the regeneration operation is performed. Alternatively, the durability of the coating layer 25 may decrease, and the processing accuracy may decrease. Further, when the covering layer 25 is removed every time the regenerating work is performed in order to increase the processing accuracy, the regenerating work becomes complicated and the cost required for the regenerating work increases.

  On the other hand, when the region 11 a adjacent to the inclined surface 15 on the outer peripheral surface 11 is partially covered with the covering layer 25, not only the covering layer 25 but also the portion covered with the covering layer 25 in the main body 3. Can be removed at the same time, so that the reaming operation of the reamer 1 can be performed at low cost.

  At this time, in order to partially expose the first end surface 13, the inclined surface 15, and the outer peripheral surface 11 from the coating layer 25, when the coating layer 25 is coated on the main body 3 by the CVD method or the PVD method, What is necessary is just to mask the exposed part. For example, masking is performed on a region of the outer peripheral surface 11 excluding the region adjacent to the inclined surface 15, and the main body 3 is coated with the coating layer 25, and then the masking is removed, thereby adjacent to the inclined surface 15 on the outer peripheral surface 11. The region may be partially covered with the covering layer 25.

  Moreover, you may form the coating layer 25 by the method of the below-mentioned besides the method of using masking as mentioned above. Specifically, when the coating layer 25 is coated on the main body 3, the entire first end surface 13 is coated at the same time, and then a desired region on the first end surface 13 is exposed from the coating layer 25. The layer 25 may be omitted.

  4 to 8, in order to facilitate visual understanding, the boundary between the outer peripheral surface 11, the end surface 13 and the inclined surface 15 is indicated by a solid line, and the periphery of the coating layer 25 is indicated by a one-dot chain line. Yes.

  Next, the reamer 1 of 2nd Embodiment is demonstrated in detail using drawing. In addition, in each structure concerning this embodiment, about the structure which has the same function as 1st Embodiment, the same referential mark is attached and the detailed description is abbreviate | omitted. For example, in the reamer 1 of the present embodiment, the main body 3 is the same as the main body 3 in the reamer 1 of the first embodiment. Moreover, the thing of the material similar to the coating layer 25 in the reamer 1 of 1st Embodiment is used as the coating layer 25. FIG.

  As shown in FIGS. 9 to 11, the reamer 1 of the present embodiment is different from the position where the coating layer 25 is provided in the package of the first embodiment in the position where the coating layer 25 is provided. In the reamer 1 of the first embodiment, the entire inclined surface 15 is covered with the coating layer 25 in order to protect the inclined surface 15. On the other hand, in the reamer 1 of this embodiment, in order to protect the 1st cutting edge 17, the area | region 15a along the 1st cutting edge 17 in the inclined surface 15 is partially covered.

  When it is required to protect the entire inclined surface 15, the entire inclined surface 15 is required to be covered with the coating layer 25, but the first cutting edge 17 is protected instead of the entire inclined surface 15. When this is required, the region 15a along the first cutting edge 17 on the inclined surface 15 may be partially covered. This facilitates heat radiation from the region of the inclined surface 15 exposed from the coating layer 25 to the outside, and therefore heat can be further radiated better than the reamer 1 of the first embodiment.

<Cutting tools>
Next, a cutting tool 101 according to an embodiment of the present invention will be described with reference to FIG. In addition, although the reamer 1 in any one of the above-mentioned embodiments can be used as the cutting tool 101, the case where the reamer 1 of the first embodiment is used will be described in detail here as an example.

  The cutting tool 101 of this embodiment is provided with the reamer 1 which concerns on the above-mentioned 1st Embodiment, and the holder 103 which fixes the shank part 9 of the reamer 1, as shown in FIG. The other end side of the reamer 1 is fixed so that the part side protrudes from the holder 103. Here, the other end side means a portion excluding one end side where the inclined surface 15 and the first cutting edge 17 are formed.

  In the reamer 1 of the present embodiment, the first cutting edge 17 is formed only on one end side of the reamer 1 and the other end portion is a shank portion 9, which is shown in FIG. 12. In the cutting tool 101, the other end of the reamer 1 is fixed to the holder 103. However, since the portion excluding the one end side where the inclined surface 15 and the first cutting edge 17 are formed is the other end side, for example, the main body 3 in the direction parallel to the rotation axis S In the case where the center is the shank portion 9, the reamer 1 may be fixed to the holder 103 at the center of the main body portion 3.

  That is, in the reamer 1, the shank portion 9 is inserted into the reamer holding portion of the holder 103. Then, the shank portion 9 is fixed using a fixing means 107 such as a collet chuck of the holder 103, and the end surface of the other end portion of the main body portion 3 (hereinafter also referred to as a second end surface for convenience) is the holder 103. It contacts with the contact part. By bringing the second end face into contact with the contact portion 109 of the holder 103, it is not necessary to adjust the protruding amount on the one end portion side of the reamer 1, and the tool can be easily adjusted. In this way, the cutting tool 101 of this embodiment is configured. The holder 103 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.

<Manufacturing method of cut product>
Next, one Embodiment of the manufacturing method of the cut workpiece which concerns on this invention is described with reference to FIGS. In addition, although any reamer 1 of each above-mentioned embodiment can be used, the case where the reamer 1 of 1st Embodiment is used is mentioned as an example, and it demonstrates in detail here. However, in FIGS. 13 to 15, the holder 103 of the cutting tool 101 is omitted for simplification.

  The manufacturing method of the cut workpiece according to the embodiment of the present invention includes a step of rotating the cutting tool 101 about the rotation axis S, and a first cutting edge 17 of the rotating cutting tool 101 as a work material. And a step of bringing the work material 201 away from the cutting tool 101.

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

(I) The process of arrange | positioning the cutting tool 101 so that one edge part of the reamer 1 may be located below the to-be-cut material 201 in which the machining hole 203 is formed as shown in FIG.

    (Ii) A step of rotating the reamer 1 of the cutting tool 101 in the direction of the arrow X about the rotation axis S and moving the reamer 1 in the Y direction to approach the work material 201 as shown in FIG.

  This step may be performed, for example, by fixing the work material 201 on the table of the cutting tool 101 to which the reamer 1 is attached and bringing the work piece 201 closer to the work material 201 in a rotated state. In this step, the work material 201 and the reamer 1 need only be relatively close to each other. For example, the work material 201 may be made close to the reamer 1, contrary to the above example.

(Iii) Next, as shown in FIG. 14, the first cutting edge 17 of the rotating reamer 1 is moved into the work hole 203 of the work material 201 by bringing the reamer 1 closer to the work material 201. The process of contacting the inner wall.

  Thereby, the inner wall of the processing hole 203 can be smoothed. For example, when burrs remain in the processing hole 203 of the work material 201, the burrs can be removed. At this time, the width of the first end face 13 is required to be smaller than the inner diameter of the processed hole 203 in order to reduce the possibility that the first end face 13 contacts the work material 201. In this step, the reamer 1 having a diameter larger than that of the processing hole 203 of the work material 201 may be used to perform cutting so as to widen the hole diameter of the processing hole 203.

  In the reamer 1 described above, the entire surface of the main body 3 is not covered with the covering layer 25, but the first end surface 13 located on one end side of the main body 3 is exposed from the covering layer 25. Yes. Therefore, the cutting heat generated during the above-described cutting process can be transmitted from the exposed first end surface 13 to the other end side through the inside of the main body portion 3, so that the reamer 1 can be externally connected from the rear end side. Heat can be dissipated well. Therefore, the tool life of the reamer 1 can be improved and holes can be formed with high accuracy.

    (Iv) A step of moving the reamer 1 in the Z direction to separate the cutting tool 101 from the work material 201 as shown in FIG.

  Note that, similarly to the process (ii) described above, in this process, the work material 201 and the reamer 1 may be relatively separated from each other. For example, the work material 201 may be separated from the reamer 1.

  By passing through the above processes, the inner wall of the processed hole 203 can be smoothed, that is, excellent hole workability can be exhibited, and the excellent tool life of the reamer 1 can be combined. Therefore, the inner wall of the machining hole 203 of the work material 201 can be cut stably over a long period of time.

  In addition, when performing the above-mentioned cutting of the work material 201 a plurality of times, for example, when smoothing the inner wall with respect to the plurality of processing holes 203, the reamer 1 is kept rotating while the workpiece is being rotated. What is necessary is just to repeat the process which makes the 1st cutting blade 17 of the reamer 1 contact the inner wall of the processing hole 203 located in the different location of the cutting material 201. FIG.

  Note that typical examples of the material of the work material 201 include carbon steel, alloy steel, stainless steel, cast iron, and non-ferrous metal.

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. .

DESCRIPTION OF SYMBOLS 1 ... Reamer 3 ... Main-body part 5 ... Groove part 7 ... Cutting part 9 ... Shank part 11 ... Outer peripheral surface 13 ... End surface 15 ... Inclined surface 17 ... No. 1 cutting edge 19 ... 2nd cutting edge 21 ... 1st margin 25 ... coating layer 101 ... cutting tool 103 ... holder 105 ... reamer holding part 107 ... fixing means 109 ... Present part 201 ... Work material 203 ... Processing hole

Claims (5)

A rod-shaped body having a rotation axis, comprising an outer peripheral surface, an end surface located on one end side, and an inclined surface located between the end surface and the outer peripheral surface, and a main body portion made of cemented carbide ;
A groove formed from the inclined surface to the outer peripheral surface;
A cutting edge formed at the intersection of the inner surface of the groove and the inclined surface;
It is made of titanium carbide, titanium nitride, titanium carbonitride, or alumina, and is arranged so that at least a part of the end surface is exposed from the inclined surface to the end surface except for a region adjacent to the inclined surface in the groove. reamer, characterized in that it comprises a covering layer.   2. The reamer according to claim 1, wherein a central portion including an intersection with the rotation shaft is exposed from the coating layer, and a peripheral portion of the end surface is covered with the coating layer. The outer peripheral surface, reamer according to claim 1 or 2 area adjacent to the inclined surface, characterized in that it is partially coated in the coating layer. Reamer according to any one of claims 1 to 3 ,
A cutting tool comprising: a holder that holds the other end side of the reamer so that the one end side of the reamer protrudes outward. Rotating the cutting tool according to claim 4 about the rotation axis;
A method for manufacturing a cut product, comprising: a step of bringing the cutting edge of the reamer in the rotating cutting tool into contact with a work material; and a step of separating the cutting tool from the work material.

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