JP5872629B2 - Cutting tools - Google Patents

Description

  The present invention relates to a cutting tool having a cutting tool in which a breaker plate is disposed on a rake face.

  By providing a breaker consisting of grooves and barriers on the rake face of the cutting tool's cutting tool, the length and flow direction of chips that flow out when the workpiece is cut can be adjusted. It is known to improve the above. In a cutting tool equipped with a breaker, it becomes possible to cut the chip into a desired length or adjust the outflow direction by contacting the chip with the breaker when cutting the workpiece. Yes. Therefore, in order to adjust the cutting length and outflow direction of chips to an appropriate range, the positional relationship between the cutting edge of the cutting tool and the breaker, the shape of the breaker, etc. can be varied depending on the workpiece material, cutting conditions, etc. Must be set to

  In this cutting tool, as the material of the cutting tool, diamond having a relatively high hardness, a diamond sintered body, or the like is employed, thereby extending the life of the cutting tool, improving the quality of the cutting product, and the like. In order to effectively use such a material, it is preferable to regrind the cutting tool when the cutting tool has been worn and the cutting performance is reduced, so that the cutting performance is restored to a good state again. However, if the cutting tool provided with the breaker is re-polished as described above, it becomes difficult to maintain the arrangement and shape of the breaker set in advance.

  Thus, for example, Patent Document 1 proposes a cutting tool that can be re-polished and used even if a breaker is provided on the rake face. In this cutting tool, a rake face of a cutting tool made of a diamond sintered body is directly processed to form a plurality of barriers extending in parallel with each other in a stepped manner with a constant interval and a constant height difference. Among these barriers, the barrier located on the most distal side of the blade is a breaker. Then, by re-polishing the cutting tool according to the distance between the barriers, the tip side is removed from the barrier constituting the breaker of the cutting tool, and the barrier constituting the breaker is adjacent to the barrier. A new cutting edge is formed on the rake face between the barrier. As a result, the barrier adjacent to the barrier constituting the breaker before re-polishing becomes a new breaker after re-polishing. For this reason, the arrangement and shape of the breaker set in advance are maintained even after re-polishing.

  However, as described above, a material such as a diamond sintered body has a relatively high hardness, so that it is difficult to directly process it, and it is difficult to accurately provide a breaker having a desired shape on the rake face. In addition, for example, when the workpiece is made of a material that easily causes welding, such as an aluminum alloy, it is preferable to perform mirror processing on the rake face of the cutting tool by lapping or the like. On the rake face that has been mirror-finished, it is possible to reduce chip welding and chipping because it is possible to reduce the frictional resistance when scraping scrapes. In addition, it is possible to improve the chip discharging property, stabilize the machined surface roughness of the cut product, and the like. However, if a plurality of barriers are formed as breakers on the rake face as described above, the process of applying mirror finish becomes complicated.

  Therefore, it is conceivable to dispose a breaker plate made of a member separate from the cutting tool instead of directly processing the rake face of the cutting tool. At this time, the rake face and the breaker plate are brought into contact with each other so that no gap is generated therebetween, thereby avoiding the entry of chips.

JP 2012-101305 A

  As described above, in a cutting tool in which a breaker plate is disposed on a rake face, along with re-polishing the cutting tool, the breaker plate is also polished, and the re-polished cutting blade and breaker plate can maintain an appropriate positional relationship. Need to be adjusted. However, when polishing the breaker plate, for example, since a grindstone is used, the grindstone easily comes into contact with the rake face of the cutting tool disposed in contact with the breaker plate. Therefore, even if the rake face is mirror-finished, there is a concern that the rake face may become rough because the grindstone comes into contact when the breaker plate is polished. As a result, with this cutting tool, there is a concern that chip removability, cutting efficiency, quality of a cut product, and the like may be deteriorated when repolishing.

  The present invention has been made to solve the above-described problems, and can provide a breaker plate on the rake face easily and with high accuracy, and can polish the breaker plate while suppressing roughening of the rake face. An object of the present invention is to provide a cutting tool that can be easily adjusted so that the arrangement and shape of the breaker plate are within an appropriate range even after re-grinding of the cutting tool.

In order to achieve the above object, according to the present invention, a first cutting edge and a second cutting edge are provided at a crossing ridge line portion between a rake face and a flank face, and the first cutting edge and the second cutting edge are provided. A cutting tool that has a cutting tool that continuously forms a corner on the tip side and has a breaker plate disposed on the rake face, and of the side surfaces of the breaker plate, Along the extending direction of the dividing line that divides the cutting edge angle formed by the first cutting edge and the second cutting edge, the cutting edge is spaced from the tip of the corner at a predetermined interval, and the extending direction of the tip side surface extends to the dividing line. inclined against, among main surfaces of the breaker plate, the contact main surface facing the rake face, said at least one or more grooves extending substantially parallel to the distal end side is formed, of the contact main surface , the tip side of the groove of the last end side, characterized in that it detachably contact with the rake face To.

  In the re-grinding of the cutting tool, each of the first cutting blade side and the second cutting blade side is polished so that the size of the cutting edge angle of the cutting tool before wear is maintained. For this reason, when the blade is re-polished, the tip of the corner is apparently displaced toward the rear end of the blade. At this time, the tip of the corner is displaced along a dividing line (hereinafter, also simply referred to as a dividing line) that coincides with a tool axis such as a shank provided with a cutting tool and that divides the edge angle.

  In the cutting tool according to the present invention, the tip side surface of the breaker plate is arranged at a predetermined interval along the extending direction of the dividing line from the tip of the corner so that the length and the outflow direction of the chips can be adjusted to an appropriate range. It is separated. And the groove | channel extended substantially parallel to a front end side surface is formed in the contact main surface of a breaker board. In the following, the main surface of the breaker plate that is the back surface of the contact main surface is also referred to as a non-contact main surface.

  In this re-grinding of the cutting tool, for example, the tip of the corner of the cutting tool is displaced from the initial position by the same amount as the distance from the tip side surface of the breaker plate to the groove in the extending direction of the dividing line. Here, the initial position is a position with respect to the extending direction of the dividing line at the tip of the corner before the workpiece is cut, that is, before the cutting tool is worn. Also, the breaker plate is polished from the side surface of the tip until reaching the groove, and the tip side is removed from the groove of the breaker plate.

  At this time, polishing can be performed in a state where the grindstone for polishing the breaker plate is separated from the rake face (contact main surface) of the cutting tool by the depth of the groove, which is a space. That is, in the thickness direction of the breaker plate, the grindstone is brought into contact from the non-contact main surface until reaching the groove, and in this state, the grindstone is moved in the in-plane direction of the breaker plate. Accordingly, when the polishing is performed from the side surface of the front end until reaching the groove, the breaker plate separates the front end side and the rear end side from the groove.

  The breaker plate and the cutting tool are fixed to each other on the rear end side with respect to the groove of the breaker plate, and the tip side of the contact main surface groove is detachably in contact with the rake face. For this reason, as described above, with the grindstone spaced from the rake face, polishing is performed so that the tip side is separated from the rear end side with respect to the groove of the breaker plate, so that the tip side is removed from the rake face. It can be easily removed. In addition, the contact position of the grindstone with respect to the tip side surface of the breaker plate and the moving amount of the grindstone during polishing can be adjusted by setting the feed amount of the grindstone in the grinder.

  When the breaker plate is polished in this manner, the inner wall surface on the rear end side of the groove is exposed as a new front end side surface. This groove is formed substantially parallel to the tip side surface of the breaker plate before polishing. Therefore, the positional relationship between the corner displaced by the re-grinding of the cutting tool and the tip side surface of the newly formed breaker plate and the shape of the tip side surface can be maintained in substantially the same manner as before polishing.

  As described above, in this cutting tool, since the breaker plate made of a member separate from the cutting tool is disposed on the rake face of the cutting tool, the rake face is directly processed to provide a barrier, a groove, or the like serving as a breaker. There is no need to form. Therefore, for example, even a cutting tool made of a material having a relatively high hardness such as diamond or a diamond sintered body, a breaker plate having a desired shape can be easily and accurately provided on the rake face. In addition, since a breaker plate can be provided on the rake face after mirror finishing, for example, it is easier than when lapping is performed on a rake face in which a plurality of barriers are directly processed as a breaker. Can be mirror-finished.

  Further, in this cutting tool, a groove substantially parallel to the tip side surface is formed on the main contact surface of the breaker plate. Thereby, it is possible to avoid the grindstone from coming into contact with the rake face even if the breaker plate is polished along with the re-polishing of the cutting tool. That is, even when the rake face is mirror-finished, it is possible to effectively suppress the rake face from becoming rough. Moreover, the arrangement and shape of the breaker plate set in advance can be easily maintained even after re-polishing.

  As a result, even after re-polishing, it is possible to appropriately adjust the cutting length and outflow direction of the chips, effectively suppress chip welding and chipping, and improve chip discharge. As a result, it is possible to obtain a high-quality cutting product with a stable surface roughness.

In the above cutting tool, wherein the grooves that have been formed in plural at intervals along the extending direction of the dividing line. By increasing the number of grooves, the number of times that re-polishing can be performed can be increased. In other words, a plurality of grooves are formed according to the number of necessary re-polishing, and the re-polishing is performed so that the corners of the cutting tool are displaced by a size corresponding to the interval between the grooves. As a result, the same effects as described above can be obtained, and the cost required for cutting the workpiece can be effectively reduced by more effectively using the material of the blade.

  Said cutting tool WHEREIN: At least one of the 1st side surface which faces the said 1st cutting blade side among the side surfaces connected with the said front end side surface of the said breaker board, and the 2nd side surface which faces the said 2nd cutting blade side, The surface direction is a parallel side surface substantially parallel to the extending direction of the dividing line, and an interval is formed between the first side blade or the second cutting blade adjacent to the parallel side surface and the parallel side surface. Therefore, it is preferable that an escape portion capable of passing the chips is formed.

  Even if the first cutting edge and the second cutting edge are displaced toward the rear end side in the extending direction of the dividing line by re-grinding the cutting tool, the first cutting edge with respect to the extending direction of the dividing line And the inclination of each of the 2nd cutting blade does not change. Therefore, it is possible to perform re-polishing while maintaining the inclination of each of the first cutting edge and the second cutting edge substantially constant with respect to parallel side surfaces substantially parallel to the extending direction of the dividing line. That is, the clearance between the parallel side surface and the first cutting blade or the second cutting blade adjacent to the parallel side surface that allows the chips cut by contact with the tip side surface to pass through and escape is escaped. By forming in advance as a portion, the escape portion can be easily maintained even after re-polishing.

  Therefore, with this cutting tool, for example, even when inner diameter machining is performed on a workpiece, it is possible to effectively prevent chips from remaining between the workpiece and the breaker plate, and to discharge chips. Efficiency can be improved. Further, the chip discharge efficiency can be maintained well even after re-polishing.

  Said cutting tool WHEREIN: It is preferable that a said 1st side surface is the said parallel side surface, and a said 2nd side surface follows the side surface of the said cutter on the said 2nd cutting blade side. In this case, even if regrinding is performed, the escape portion can be easily maintained on the first side surface side of the breaker plate. Further, since the area of the tip side surface can be increased by extending the second side surface side of the breaker plate until it reaches the side surface on the second cutting edge side of the cutting tool, the strength and durability of the breaker plate can be improved. Can do.

  In the present invention, since the breaker plate made of a member separate from the cutting tool is disposed on the rake face of the cutting tool, it is not necessary to directly process the rake face, and the breaker board having a desired shape is provided easily and with high accuracy. It becomes possible. In addition, even if the breaker plate is polished along with the re-polishing of the cutting tool, the grindstone can be prevented from coming into contact with the rake face, so that the rake face can be prevented from being roughened. Furthermore, the arrangement and shape of the breaker plate set in advance can be easily maintained even after re-polishing.

  As a result, even after re-polishing, it is possible to appropriately adjust the cutting length and outflow direction of the chips, effectively suppress chip welding and chipping, and improve chip discharge.

It is a principal part schematic plan view of the cutting tool which concerns on 1st Embodiment of this invention. It is a principal part schematic side view of the cutting tool of FIG. 3A is a schematic explanatory view showing a state in which the cutting tool of FIG. 1 is re-polished to displace the corner of the blade, and FIG. 3B is a diagram in which a grindstone is brought into contact with the tip side surface of the breaker plate on the blade of FIG. 3A. FIG. 3C is a schematic explanatory view showing a state where the front end side and the rear end side are separated from the groove of the breaker plate of FIG. 3B, and FIG. 3D is a schematic explanatory view showing the state of FIG. It is a schematic explanatory drawing which shows the state which removed the front end side from the scoop surface rather than the groove | channel of the breaker board. It is a principal part schematic plan view of the cutting tool which concerns on 2nd Embodiment of this invention. It is a principal part schematic side view of the cutting tool of FIG.

  Hereinafter, preferred embodiments of the cutting tool according to the present invention will be described and described in detail with reference to the accompanying drawings.

<< First Embodiment >>
The configuration of the cutting tool 10 according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a schematic plan view of the main part of the cutting tool 10, and FIG. 2 is a schematic side view of the main part of the cutting tool 10. The cutting tool 10 cuts a workpiece (not shown) made of, for example, an aluminum alloy, for example, and is disposed on the cutting tool 14 provided at the tip of the shank 12 and the rake face 16 of the cutting tool 14. And the breaker plate 18. In addition, let the side which contacts the workpiece | work of the cutting tool 10 and perform a process be a front end side, and let the side fixed to the holder etc. of a machine tool not shown be a rear end side.

  The cutting tool 14 is formed of, for example, a material such as diamond or a diamond sintered body, the tip side is a substantially triangular inclined sword bite, and the rake face 16 and the flank 20 (see FIG. 2) are formed by lapping or the like. Mirror finish. In the present embodiment, the case where the blade 14 is a sword bite will be described as an example, but the present invention is not particularly limited thereto. The cutting tool 14 can be arbitrarily selected according to the material of the workpiece and the purpose of cutting. For example, various configurations such as a straight blade, a tip, a reamer, and a drill can be applied. Further, the blade 14 may be formed of a material other than diamond, a diamond sintered body, or the like, and the rake face 16 and the flank face 20 may not be mirror-finished.

  The cutting tool 14 is provided with a first cutting edge 22 (see FIG. 1) and a second cutting edge 24 at the intersecting ridge line portion between the rake face 16 and the flank face 20, and the first cutting edge 22 and the second cutting edge 24, Are connected at the tip side to form a corner 26. That is, the angle formed by the first cutting edge 22 and the second cutting edge 24 is the cutting edge angle α of the cutting tool 14 (see FIG. 1).

  The size of the blade edge angle α is kept constant even after the blade 14 is re-polished as will be described later. That is, re-polishing is performed so that the inclination of each of the first cutting edge 22 and the second cutting edge 24 with respect to the dividing line a-a ′ (see FIG. 1) dividing the cutting edge angle α is maintained. For this reason, when the blade 14 is re-polished, the tip of the corner 26 is displaced to the rear end side of the blade 14 along the dividing line a-a ′.

  In the present embodiment, the case where the axial direction of the shank 12 coincides with the direction of the dividing line a-a ′ is described, but the present invention is not particularly limited thereto. For example, in a cutting tool 14 in which the tip of the corner 26 is not disposed on the axial direction of the shank 12, such as a so-called bending tool, the direction in which the tip of the corner 26 is displaced by re-grinding coincides with the direction of the dividing line aa ′. It only has to be.

  Further, the cutting tool 14 has the back surface of the rake face 16 fixed to the tip of the shank 12 by brazing or the like.

  The breaker plate 18 comes into contact with the chips separated from the workpiece in accordance with the cutting process, and cuts the chips to a desired length, or adjusts the outflow direction of the chips to a desired direction. . The breaker plate 18 is preferably formed of a material having a high hardness that is unlikely to be worn or damaged even when chips collide, for example, cemented carbide.

  A front end side surface 28 which is a side surface on the front end side of the breaker plate 18 is inclined at an angle β (see FIG. 1) with respect to the dividing line aa ′ and extends from the front end of the corner 26 along the dividing line aa ′. At a predetermined interval L1. As described above, each of the angle β and the interval L1 is set to an appropriate size so that the chips contacting the tip side surface 28 have a desired cutting length and outflow direction.

  Of the two side surfaces connected to the tip side surface 28 of the breaker plate 18, the first side surface 29 a (see FIG. 1) facing the first cutting edge 22 extends substantially parallel to the inclination of the first cutting edge 22. doing. Further, the second side face 29 b facing the second cutting edge 24 extends substantially parallel to the inclination of the second cutting edge 24.

  Further, among the main surfaces of the breaker plate 18, the contact main surface 30 (see FIG. 2) facing the rake surface 16 is provided with a groove 32 extending substantially parallel to the tip side surface 28 in the direction of the dividing line aa ′. A plurality of lines are formed at intervals L2 along the line. That is, each of the plurality of grooves 32 is inclined by an angle β with respect to the dividing line a-a ′. Of the grooves 32 formed on the contact main surface 30, the distance along the dividing line a-a ′ between the groove 32 a disposed on the most distal side and the tip side surface 28 is also set to L <b> 2. Specifically, among the inner walls of the groove 32a, the interval between the inner wall 32b on the rear end side in the dividing line a-a ′ direction and the front end side surface 28 is set to L2.

Moreover, the depth of each of the plurality of grooves 32 is set to d (see FIG. 2) described later. Of the groove 32 formed in contact the principal surface 30, one located closest to the rear end side is also referred to as the groove 32c.

  Of the main contact surface 30, the tip side of the groove 32c and the rake face 16 are in contact with each other so as to be detachable. That is, the positions of the cutting tool 14 and the breaker plate 18 are fixed on the rear end side of the groove 32c of the main contact surface 30. In the illustration of FIG.1 and FIG.2, the adhesion surface 33 (refer FIG. 2) of the breaker board 18 is being fixed to this shank 12 by brazing etc. in the rear-end side of the blade 14 fixed to the shank 12, for example. Yes. As a result, the breaker plate 18 is disposed on the rake face 16 of the cutting tool 14 so that the main contact surface 30 is detachably contacted. Thus, by making the rake surface 16 and the contact main surface 30 contact, it can suppress that a chip | tip enters between each other.

  Note that reference numeral 34 in FIGS. 1 and 2 indicates a non-contact main surface. The non-contact main surface 34 is the back surface of the contact main surface 30.

  Basically, the cutting tool 10 configured as described above is used when cutting a predetermined workpiece made of an aluminum alloy or the like. Cutting is mainly performed by the first cutting edge 22 and the second cutting edge 24. For this reason, the 1st cutting edge 22 and the 2nd cutting edge 24 wear out with repetition of cutting. Therefore, the first cutting edge 22 and the second cutting edge 24 are regenerated by re-polishing.

  With reference to FIGS. 3A to 3D, the step of re-polishing the cutting tool 14 and the step of polishing the breaker plate 18 along with the step will be described. In FIGS. 3A to 3D, the shank 12 is not shown.

  First, as shown in FIG. 3A, the blade 14 is polished and the tip side thereof is removed. Specifically, each of the first cutting edge 22 side and the second cutting edge 24 side is polished so that the cutting edge angle α of the cutting tool 14 is maintained. As a result, the tip of the corner 26 of the blade 14 is displaced from the initial position by the same size as the distance L2 from the tip side surface 28 of the breaker plate 18 to the groove 32a in the direction of the dividing line a-a ′. The initial position is a position with respect to the direction of the dividing line a-a ′ at the tip of the corner 26 before cutting the workpiece, that is, before the cutting tool 14 is worn.

  Next, as shown in FIG. 3B, the grindstone 36 for polishing the breaker plate 18 is separated from the rake face 16 (the main contact surface 30) of the cutting tool 14 at a distance L <b> 3 on the tip side surface 28 of the breaker plate 18. Make contact. That is, in the thickness direction of the breaker plate 18, the grindstone 36 is contacted from the non-contact main surface 34, which is the back surface of the contact main surface 30, until reaching the groove 32, and in this state, the in-plane of the breaker plate 18 The grindstone 36 is moved in the direction.

  Thus, as shown in FIG. 3C, the polishing is performed until the groove reaches the groove 32a from the front end side surface 28, specifically, the inner wall 32b of the groove 32a and the non-contact main surface 34 become flat. As a result, in the breaker plate 18, the front end side and the rear end side are separated from the inner wall 32b of the groove 32a, and the front end side becomes the separation piece 38.

  As described above, the breaker plate 18 is fixed to the shank 12 (see FIGS. 1 and 2) via the adhesive surface 33 on the rear end side of the groove 32a, whereby the contact main surface 30 is fixed to the rake surface 16. It is arranged to face. That is, the main contact surface 30 and the rake face 16 on the tip side of the groove 32c of the breaker plate 18 are only detachably in contact with each other. For this reason, the separation piece 38 can be easily removed from the rake face 16. That is, as described above, the grindstone 36 is separated from the rake face 16 at the interval L3 and polished so that the separation piece 38 is formed, so that the tip side is more easily removed than the groove 32a of the breaker plate 18. be able to.

  Here, the depth d of the groove 32 is such that when the separation piece 38 is formed as described above, a gap L3 that can sufficiently avoid contact between the grindstone 36 and the rake face 16 can be secured. Is set to Therefore, even if the breaker plate 18 is polished using the grindstone 36, the grindstone 36 can be prevented from coming into contact with the rake face 16 of the cutting tool 14, so that the rake face 16 is effectively prevented from being roughened. it can.

  By performing the above steps, as shown in FIG. 3D, the inner wall 32b of the groove 32a formed substantially parallel to the tip side surface 28 of the breaker plate 18 before being removed is exposed as a new tip side surface 28. For this reason, the distance along the dividing line a-a ′ between the corner 26 displaced by the re-grinding of the cutting tool 14 and the new tip side surface 28 of the breaker plate 18 is L1. Further, the inclination angle of the new tip side surface 28 with respect to the dividing line a-a ′ is β. That is, the positional relationship between the tip side surface 28 and the corner 26 after polishing and the shape of the tip side surface 28 can be easily maintained so as to be substantially the same as before polishing.

  As described above, each of the angle β and the interval L1 is set so that the chips contacting the tip side surface 28 have an appropriate cutting length and outflow direction. For this reason, the cutting tool 10 can appropriately process chips even after re-polishing.

  Moreover, in the cutting tool 10, since the breaker board 18 which consists of a member different from the cutting tool 14 is arrange | positioned in the rake face 16 of the cutting tool 14, it processes directly to this rake face 16, and becomes a barrier used as a breaker. There is no need to form a groove or the like. As a result, for example, even if the cutting tool 14 is made of a material having a relatively high hardness such as diamond or a diamond sintered body, the breaker plate 18 having a desired shape can be easily and highly accurately provided on the rake face 16. .

  Further, the breaker plate 18 can be provided on the rake face 16 after the blade 14 is subjected to a lapping process or the like to perform a mirror finish. For this reason, in this cutting tool 10, for example, mirror finishing can be easily performed as compared with a case where lapping is performed after directly processing a plurality of barriers or the like as breakers on the rake face 16.

  Further, even if the breaker plate 18 is polished along with the re-polishing of the cutting tool 14, it is possible to avoid the grindstone 36 from coming into contact with the rake face 16 as described above. Therefore, even when the rake face 16 is mirror-finished, it is possible to effectively suppress the rake face 16 from being roughened.

  From the above, in the cutting tool 10, even after re-grinding the cutting tool 14, it is possible to appropriately adjust the cutting length and outflow direction of the chips, effectively suppress chip welding and chipping, and chips. Can be improved. As a result, it is possible to obtain a high-quality cutting product with a stable surface roughness.

  In the cutting tool 10, a plurality of grooves 32 are formed at intervals L2 along the direction of the dividing line a-a '. For this reason, when the 1st cutting edge 22 and the 2nd cutting edge 24 of the blade 14 after re-polishing wear again, the process of re-polishing the blade 14 and the process of grind | polishing the breaker board 18 similarly to the above. And can be done.

  That is, at each re-polishing, the corner 26 of the blade 14 is displaced by an interval L2 and the breaker plate 18 on the tip side is removed from the rake face 16 rather than the groove 32 arranged on the most distal side. Thus, repolishing can be performed while maintaining the positional relationship between the tip side surface 28 and the corner 26 and the shape of the tip side surface 28.

  Therefore, the number of the grooves 32 may be determined according to the number of times that the blade 14 is supposed to be repolished. As a result, since the cutting tool 10 can be effectively re-polished and used, for example, the material of the blade 14 such as a diamond sintered body can be used effectively, and the cost required for cutting the workpiece can be reduced. it can. Note that the wall between the plurality of grooves 32 of the breaker plate 18 is set to a thickness that exhibits sufficient durability even when chips collide during workpiece cutting.

<< Second Embodiment >>
Next, a cutting tool 40 according to a second embodiment of the present invention will be described with reference to FIGS. 4 and 5. 4 is a schematic plan view of the main part of the cutting tool 40, and FIG. 5 is a schematic side view of the main part of the cutting tool 40. 4 and 5, those having the same or similar functions and effects as those shown in FIGS. 1 to 3D are given the same reference numerals, and detailed description thereof is omitted. Omitted.

  The cutting tool 40 includes a cutting tool 42 and a breaker plate 44 instead of the cutting tool 14 and the breaker plate 18 among the components of the cutting tool 10 described above. First, the breaker plate 44 will be described. The main difference between the breaker plate 44 and the breaker plate 18 is that the first side surface 45a is composed of parallel side surfaces in a plane direction substantially parallel to the dividing line aa ′ direction, and the second side surface 45b is a cutting tool 42. It is the point arrange | positioned so that the 2nd cutting blade 24 side side surface may be followed.

  Between the front end side of the first side surface 45a and the first cutting edge 22, an interval L4 is formed as a relief portion along a direction orthogonal to the dividing line a-a 'direction. That is, when cutting the workpiece, the chips cut by the contact with the tip side surface 28 can be discharged from the interval L4. As a result, it is possible to effectively prevent the chips from remaining between the workpiece and the breaker plate 44, so that the chip discharge efficiency can be improved.

  Further, as described above, since the area of the tip side surface 28 of the breaker plate 44 can be increased by extending the second side surface 45b until reaching the side surface on the second cutting edge 24 side of the cutting tool 42, the breaker The strength and durability of the plate 44 can be improved.

  The cutting tool 42 is provided with a notch 46 on the rear end side of the portion where the breaker plate 44 is disposed on the rake face 16. An adhesive surface 48 (see FIG. 5) on the rear end side of the breaker plate 44 is fixed to the shank 12 through the notch 46. Further, when the breaker plate 44 is disposed in the notch 46, the rear end side of the breaker plate 44 and the rear end side of the cutting tool 42 are configured to be flush with each other.

  The cutting tool 40 can be re-polished in the same manner as the cutting tool 10 described above. Even if the first cutting edge 22 and the second cutting edge 24 are displaced toward the rear end side in the dividing line aa ′ direction by performing re-polishing as described above, the dividing line aa. The inclination of each of the first cutting edge 22 and the second cutting edge 24 with respect to the 'direction does not change. Accordingly, the first side surface 45a, which is a parallel side surface substantially parallel to the direction of the dividing line aa ′, is re-polished while maintaining the inclination of each of the first cutting edge 22 and the second cutting edge 24 substantially constant. It can be performed.

  Accordingly, even after re-grinding, the distance L4 can be maintained between the first side face 45a and the first cutting edge 22, so that it is effective that chips remain between the workpiece and the breaker plate 44. Suppressing and maintaining chip discharge efficiency. For this reason, for example, even when the inner diameter of the workpiece is processed by the cutting tool 40, the cut chips can be efficiently discharged, and the chip discharge efficiency can be improved by re-polishing. It can be maintained well afterwards.

  The present invention is not particularly limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

  For example, in the cutting tools 10 and 40 described above, the contact main surface 30 is provided with the plurality of grooves 32. However, the present invention is not particularly limited thereto, and at least one groove 32 is provided. Just do it.

  In the cutting tool 40 described above, the first side surface 45a of the first side surface 45a and the second side surface 45b is a parallel side surface. However, the present invention is not particularly limited thereto, and at least one of the first side surface 45a is not limited thereto. Any parallel side surface may be used. That is, the second side surface 45b may be a parallel side surface.

  Further, both the first side surface 45a and the second side surface 45b may be parallel side surfaces. In this case, the cut chips can be discharged through both between the first cutting edge 22 and the first side face 45a and between the second cutting edge 24 and the second side face 45b. Therefore, it becomes possible to improve the chip discharge efficiency more effectively.

DESCRIPTION OF SYMBOLS 10, 40 ... Cutting tool 12 ... Shank 14, 42 ... Cutting tool 16 ... Rake face 18, 44 ... Breaker board 20 ... Flank 22 ... 1st cutting edge 24 ... 2nd cutting edge 26 ... Corner 28 ... Tip side surface 29a, 45a ... 1st side surface 29b, 45b ... 2nd side surface 30 ... Contact main surface 32, 32a, 32c ... Groove 32b ... Inner wall 33, 48 ... Adhesion surface 34 ... Non-contact main surface 36 ... Grinding stone 38 ... Separation piece 46 ... Notch

Claims (3)

A first cutting edge and a second cutting edge are provided at the intersection ridge line portion between the rake face and the flank face, and the first cutting edge and the second cutting edge continuously form a corner on the tip side, and A cutting tool having a cutting tool having a breaker plate disposed on a rake face,
Of the side surfaces of the breaker plate, the front end side surface on the front end side is a predetermined distance from the front end of the corner along the extending direction of the dividing line that divides the edge angle formed by the first cutting edge and the second cutting edge. Separated by
The extending direction of the tip side surface is inclined with respect to the dividing line,
Of the main surfaces of the breaker plate, the contact main surface facing the rake surface is formed with at least one or more grooves extending substantially parallel to the tip side surface,
A cutting tool characterized in that , of the contact main surface, a tip end side of the groove on the rearmost end side is detachably in contact with the rake face. In the cutting tool according to claim 1 Symbol placement,
Of the side surfaces connected to the tip side surface of the breaker plate, at least one of the first side surface facing the first cutting edge side and the second side surface facing the second cutting edge side is such that the surface direction is the dividing line. Parallel side surfaces substantially parallel to the extending direction of
A clearance is formed between the first cutting edge or the second cutting edge adjacent to the parallel side surface and the parallel side surface, so that a relief portion through which chips can pass is formed. A cutting tool characterized by that. The cutting tool according to claim 2 , wherein
The first side surface is the parallel side surface;
The cutting tool according to claim 2, wherein the second side surface is along a side surface of the cutting tool on the second cutting edge side.

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