JP6495681B2 - Cutting insert, cutting tool, and manufacturing method of cut workpiece - Google Patents

Description

  The present embodiment relates to a throw-away type cutting insert, a cutting tool, and a manufacturing method of a cut workpiece, which are used for turning processing represented by grooving processing and thread cutting processing.

  As a cutting tool used for grooving, for example, a grooving tool described in Patent Document 1 and a cutting tool described in Patent Document 2 are known. When performing grooving, it may be required to provide a chamfered portion at the opening of the processed groove. In order to provide a chamfered portion using the grooving tool described in Patent Document 1, generally, after chamfering, chamfering is separately performed. Therefore, a plurality of processing steps are required.

  The cutting insert in the cutting tool described in Patent Document 2 has a chamfered cutting edge on the rear end side and outward of the front cutting edge located at the front end. By having such a chamfered cutting edge, grooving and chamfering can be performed in one step.

JP 2006-150584 A JP 2007-144572 A

  The cutting insert described in Patent Document 2 has a rising surface on the rear end side with respect to the front cutting edge and the chamfering cutting edge. Therefore, when the groove depth in the grooving process becomes deep, the distance from the front cutting edge to the rising surface becomes long, and the chip treatment on the rising surface of the chip generated by the front cutting edge may become unstable. On the other hand, in order to shorten the distance from the front cutting edge to the rising surface, when the chamfering cutting edge is moved forward so that the chamfering cutting edge is located on the side of the rising surface, the rising surface becomes the chamfering cutting edge. It will be continuous. In this case, since the rake angle in the chamfering cutting edge is a large negative value, the chip treatment in the chamfering cutting edge may become unstable.

  This aspect is made in view of the above-described problem, and an object thereof is to provide a cutting insert capable of stably processing chips even when the front cutting edge and the chamfering cutting edge are provided. To do.

A cutting insert for grooving according to one aspect includes a main surface extending from the rear end side toward the front end side, a first side surface adjacent to the main surface on the front end side, the main surface, and the first surface. A second side surface adjacent to the side surface; a first cutting edge located on a ridge line where the main surface and the first side surface intersect; a second cutting edge located on a ridge line where the main surface and the second side surface intersect; The cutting part which has this is comprised. The main surface is located on the front end side, and is a rake face that is inclined downward as it is away from the first cutting edge, and is located on the rear end side from the rake face and is away from the first cutting edge. And a rising surface inclined upward. The second cutting edge is inclined so as to move away from the perpendicular bisector of the first cutting edge as viewed from the rear end side in plan view, and is provided for providing a chamfered portion at the opening of the machining groove. An inclined cutting edge capable of functioning as a chamfering cutting edge is provided. The rising surface includes a central portion located on the vertical bisector and a side portion adjacent to the second side surface in plan view. Then, the side, as well located on the rear side of the inclined cutting edge, said central portion is at least partially located on the distal end side than the end portion of the rear side of the inclined cutting edge Further, the central portion is located on the rear end side with respect to the end portion on the front end side of the inclined cutting edge .

  In the cutting insert of the above aspect, since the rising surface includes the central portion and the side portion of the above configuration, in any of the first cutting blade functioning as the front cutting blade and the inclined cutting blade functioning as the chamfering cutting blade. In addition, it becomes possible to process the chips stably.

It is a perspective view which shows the cutting insert which concerns on 1st Embodiment. It is a top view of the cutting insert shown in FIG. It is an enlarged view of area | region A1 in the cutting insert shown in FIG. It is the side view which looked at the cutting insert shown in FIG. 2 from the B1 direction. It is the side view which looked at the cutting insert shown in FIG. 2 from the B2 direction. It is an enlarged view of area | region A2 in the cutting insert shown in FIG. It is the enlarged view which expanded the cutting part by seeing the cutting insert shown in FIG. 2 from the B3 direction side. It is an enlarged view which shows the same area | region as the cutting insert shown in FIG. It is sectional drawing of the C1-C1 cross section in the cutting insert shown in FIG. It is sectional drawing of the C2-C2 cross section in the cutting insert shown in FIG. It is sectional drawing of the C3-C3 cross section in the cutting insert shown in FIG. It is a top view which shows the 1st modification of the cutting insert shown in FIG. It is the schematic which shows one process in the case of manufacturing a cut workpiece using the cutting insert shown in FIG. It is a perspective view which shows the cutting insert which concerns on 2nd Embodiment. It is an enlarged view of area | region A3 in the cutting insert shown in FIG. It is the perspective view which expanded the front-end | tip part in the cutting tool which concerns on one Embodiment. It is the side view which looked at the cutting tool shown in FIG. It is a top view of the cutting tool shown in FIG. It is the side view which looked at the cutting tool shown in FIG. 17 from the B4 direction. It is a perspective view which shows 1 process in the manufacturing method of the cut workpiece of one Embodiment. It is a perspective view which shows 1 process in the manufacturing method of the cut workpiece of one Embodiment. It is a perspective view which shows 1 process in the manufacturing method of the cut workpiece of one Embodiment.

<Cutting insert>
Hereinafter, the cutting insert 1 of each embodiment is demonstrated in detail using drawing. However, each drawing referred to below is a simplified illustration of only main members necessary for describing each embodiment for convenience of explanation. Therefore, the cutting insert according to the present invention may include any constituent member that is not shown in each of the referenced drawings. 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.

  The cutting insert 1 (hereinafter also simply referred to as the insert 1) of the first embodiment includes one main body portion 3 and two cutting portions 5 as shown in FIGS. The main body 3 is a part fixed to the holder when the insert 1 is mounted on the holder. The main body 3 in the present embodiment has a rod shape extending from the rear end side toward the front end side, and extends from the rear end side toward the front end side along the central axis O1.

The main body 3 has an upper side surface 7 positioned on the upper side and in contact with the holder, and a lower side surface 9 positioned on the lower side and in contact with the holder. The upper side surface 7 is formed with an upper groove portion 7a extending in the direction along the central axis O1. Similarly, a lower groove portion (not shown) extending in the direction along the central axis O1 is formed on the lower surface 9. By having such an upper groove portion 7a and a lower groove portion, the insert 1 can be stably fixed to the holder.

  Although it does not specifically limit as a magnitude | size of the main-body part 3, For example, the length along the central axis O1 can be set to about 5-80 mm. Further, the width in the direction orthogonal to the central axis O1 (left and right direction in FIG. 2) in plan view can be set to about 2 to 20 mm, for example. Further, the height in the direction (vertical direction in FIG. 5) perpendicular to the central axis O1 in a side view can be set to about 2 to 15 mm, for example.

  The insert 1 only needs to have at least one cutting portion 5. In this embodiment, the cutting part 5 is located one by one at the front end side and the rear end side of the main body part 3. Although the main-body part 3 and the cutting part 5 may be formed separately, they may be formed integrally. In insert 1 of this embodiment, body part 3 and cutting part 5 are formed in one.

  Examples of the material of the member constituting the insert 1 include cemented carbide or cermet. 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. The cermet is a sintered composite material in which a metal is combined with a ceramic component, and specifically, a sintered composite material mainly composed of a titanium compound such as titanium carbide (TiC) or titanium nitride (TiN). Is mentioned.

The surface of the member constituting the insert 1 may be coated with a film using a chemical vapor deposition (CVD) method or a physical vapor deposition (PVD) method. Examples of the composition of the coating include titanium carbide (TiC), titanium nitride (TiN), titanium carbonitride (TiCN), and alumina (Al ₂ O ₃ ).

  When performing turning using the insert 1 of this embodiment, one of the two cutting parts 5 is used. When using the cutting part 5 located on the rear end side with respect to the main body part 3, the front end side and the rear end side of the main body part 3 may be reversed and the insert 1 may be attached to the holder. The cutting part 5 positioned on the front end side of the main body part 3 and the cutting part 5 positioned on the rear end side of the main body part 3 have the same shape. Therefore, below, the thing located in the front end side with respect to the main-body part 3 as the cutting part 5 is demonstrated.

  The cutting unit 5 includes a main surface (first main surface) 11, a lower surface 13, a side surface 15, and a cutting edge 17. The first main surface 11 is positioned as the upper surface in the present embodiment, and in the present embodiment, the first main surface 11 will be described as the upper surface 11 for convenience. The upper surface 11 extends from the rear end side toward the front end side. Specifically, the upper surface 11 has a rectangular shape having a long side in a direction substantially along the central axis O1 in plan view. Therefore, the portion located on the tip side of the short side is the end portion on the tip side of the insert 1. Further, a portion of the short side located on the rear end side is a boundary portion with the main body portion 3.

  The upper surface 11 does not have to be a rectangle in a strict sense. The long side and the short side forming the outer periphery of the rectangle may not be straight lines in the strict sense, and the corners where the long side and the short side intersect may be rounded.

  Similar to the upper surface 11, the lower surface 13 has a rectangular shape extending from the rear end side toward the front end side. The lower surface 13 in the present embodiment is slightly smaller than the upper surface 11. Therefore, the outer peripheral edge of the lower surface 13 is not visible when viewed in plan.

  The side surface 15 has a first side surface 19 and a second side surface 21. In the present embodiment, the lower surface 13 is smaller than the upper surface 11. Therefore, the side surface 15 is configured to be inclined inward as it goes from the upper surface side to the lower surface side. The side surface 15 in this embodiment functions as a flank surface. Since the side surface 15 is inclined as described above, the possibility that the side surface 15 contacts the processing surface of the work material can be reduced.

  The first side surface 19 is adjacent to the upper surface 11 on the distal end side. Specifically, the first side surface 19 is adjacent to the short side located on the tip side of the upper surface 11. As shown in FIG. 4, the first side surface 19 has a substantially rectangular shape when viewed from the front side.

  The second side surface 21 intersects the upper surface 11 and the first side surface 19, and is adjacent to the upper surface 11 and the first side surface 19. Specifically, the second side surface 21 is adjacent to the long side of the upper surface 11. Since the corner portion of the upper surface 11 where the long side and the short side intersect is rounded, the region where the first side surface 19 and the second side surface 21 intersect also has a rounded configuration. The insert 1 of this embodiment has two second side surfaces 21, and these two second side surfaces 21 form a pair of lateral side surfaces.

In the insert 1 of the present embodiment, the central axis O1 is positioned so as to pass through the centers of the first side surfaces 19 of the two cutting parts 5. The first side surface 19 is substantially quadrangular when viewed from the front end, and the center of the maximum width and the center of the maximum height of the first side surface 19 is the center of the first side surface 19. In the present specification, the front end view means a side view from the front end side where the first side surface 19 is located, and the B1 direction in FIG. 2 is the rear end from the front end side along the central axis O1. The direction is toward the side. Further, the B2 direction in FIG. 2 is a direction orthogonal to the B1 direction.

  The cutting edge 17 has a first cutting edge 23 and a second cutting edge 25. The first cutting edge 23 is located on a ridge line where the upper surface 11 and the first side surface 19 intersect. The second cutting edge 25 is located on a ridge line where the upper surface 11 and the second side surface 21 intersect. Since the insert 1 in this embodiment has a pair of second side surfaces 21, the cutting edge 17 has a pair of second cutting edges 25.

  At this time, at least the portion where the cutting edge 17 is formed on the ridge line where the upper surface 11 and the side surface 15 intersect is not a strict line shape due to the intersection of the two surfaces. If the ridge line where the side surface 15 and the upper surface 11 intersect is sharp at an acute angle, the durability of the cutting edge 17 is lowered. Therefore, at least a portion where the cutting edge 17 is formed on the ridge line where the upper surface 11 and the side surface 15 intersect each other is subjected to so-called honing processing, and this portion has a slightly curved surface shape.

  The first cutting edge 23 functions as a so-called front cutting edge and functions as a main cutting edge when performing grooving. The first cutting edge 23 in the present embodiment is located on the entire ridge line where the upper surface 11 and the first side surface 19 intersect. The first cutting edge 23 in the present embodiment extends in a direction parallel to the lower surface 13 and perpendicular to the central axis O1. Although the 1st cutting edge 23 in this embodiment is a linear shape, it is not necessarily limited to such a structure. For example, it may be partially curved when viewed from the front side.

  The pair of second cutting edges 25 in the present embodiment have inclined cutting edges 27 and side cutting edges 29, respectively. The pair of second cutting edges 25 in the present embodiment are line symmetric with respect to the perpendicular bisector O2 of the first cutting edge 23 when viewed in plan. Therefore, in the following description, description will be given focusing on one of the pair of second cutting edges 25.

The 2nd cutting blade 25 does not necessarily need to be formed in the whole ridgeline where the upper surface 11 and the 2nd side surface 21 cross | intersect. In the present embodiment, the second cutting edge 25 includes the upper surface 11 and the second side surface 21.
Is formed at a part of the ridgeline where the crosses.

  The inclined cutting edge 27 is inclined so as to move away from the vertical bisector O2 of the first cutting edge 23 toward the rear end side in plan view. In the present embodiment, the central axis O1 and the perpendicular bisector O2 of the first cutting edge 23 overlap in a plan view. Therefore, it can be paraphrased that the inclined cutting edge 27 is inclined so as to move away from the central axis O1 as it goes toward the rear end in a plan view.

The second cutting edge 25 does not necessarily have the horizontal cutting edge 29, and the cutting edge may not be formed on the ridge line between the tip side portion of the second side surface 21 and the upper surface 11. It is preferable to have. The lateral cutting edge 29 in the present embodiment is located on the distal end side with respect to the inclined cutting edge 27 and is formed up to the end portion on the distal end side in the ridge line where the upper surface 11 and the second side surface 21 intersect. Therefore, the side cutting edge 29 is connected to the first cutting edge 23. In the case of having such a horizontal cutting edge 29, it is possible to perform a process of increasing the width of the groove in the grooving process. Further, the smoothness of the inner surface 15 of the machining groove can be enhanced by the horizontal cutting edge 29. However, in order to prevent the side cutting edge 29 from excessively interfering with the inner surface 15 of the machining groove, the side cutting edge 29 is perpendicular to the first bisector of the first cutting edge 23 from the front end side toward the rear end side. It inclines so that it may approach O2.

  The inclined cutting edge 27 is located on the rear end side with respect to the horizontal cutting edge 29 and is continuous with the horizontal cutting edge 29. The inclined cutting edge 27 in the present embodiment functions as a chamfering cutting edge for providing a chamfered portion at the opening of the machining groove. Therefore, while the horizontal cutting edge 29 is inclined so as to approach the vertical bisector O2 from the front end side toward the rear end side, the inclined cutting edge 27 is arranged on the rear end side in accordance with the configuration of the chamfered portion. Inclined to move away from the vertical bisector O2 as it goes to. Specifically, it is inclined, for example, by about 20 to 70 ° with respect to the vertical bisector O2.

  The upper surface 11 in this embodiment has a rake surface 31 and a rising surface 33. The rake face 31 is located on the tip side of the upper face 11 and is continuous with the first cutting edge 23. The rake face 31 is inclined downward as the distance from the first cutting edge 23 increases. The rising surface 33 is located on the rear end side of the rake face 31 and is continuous with the rake face 31. The rising surface 33 is inclined upward as it is away from the first cutting edge 23, in other words, the rake surface 31.

  Chips generated by the cutting blade 17 flow on the rake face 31 to the rear end side. In order to reduce the cutting resistance at the cutting edge 17 and allow the chips to flow smoothly toward the rear end, the rake face 31 is configured to be inclined downward as the distance from the cutting edge 17 increases. The rising surface 33 has a function of curving chips that have traveled on the rake surface 31. Therefore, the rising surface 33 is inclined upward as the distance from the rake surface 31 increases.

  The rising surface 33 in the present embodiment is adjacent to the second side surface 21 at a center portion 35 located on the vertical bisector O2 and an end portion away from the vertical bisector O2 in plan view. And a side portion 37. The second cutting edge 25 is not formed on the ridge line where the rising surface 33 and the second side surface 21 intersect, which is the region where the side portion 37 is located.

  The side portion 37 is located on the rear end side with respect to the inclined cutting edge 27. At least a part of the central portion 35 is located on the front end side with respect to the end portion on the rear end side of the inclined cutting edge 27. In short, the rising surface 33 in the present embodiment has a convex shape protruding toward the first cutting edge 23.

  Therefore, since at least a part of the region along the inclined cutting edge 27 on the upper surface 11 can be the rake face 31 instead of the rising face 33, the rake angle at the inclined cutting edge 27 can be a positive value. Further, since the rising surface 33 has a convex shape protruding toward the first cutting edge 23, the distance D1 between the first cutting edge 23 and the central portion 35 in the direction along the central axis O1, and the center The distance D2 between the first cutting edge 23 and the side portion 37 in the direction along the axis O1 is not the same, and the distance D1 between the first cutting edge 23 and the center portion 35 in the direction along the central axis O1 is the same. It is relatively short. Thereby, the chips generated by the first cutting edge 23 can be stably processed by the rising surface 33. Therefore, it is possible to stably treat any chips generated in the first cutting edge 23 and the inclined cutting edge 27.

  In particular, the rising surface 33 in this embodiment is separated from the inclined cutting edge 27. Thereby, the whole area along the inclined cutting edge 27 on the upper surface 11 can be used as the rake face 31. Therefore, chips generated by the inclined cutting edge 27 can be more stably processed.

  Since the rising surface 33 is inclined upward as it is separated from the first cutting edge 23, the lower end is closer to the first cutting edge 23 than the upper end of the rising surface 33. As the chips flow along the rake face 31, the chips first contact the lower end of the rising surface 33. Therefore, in order to stably treat chips on the rising surface 33, it is required to bring at least the lower end of the rising surface 33 closer to the first cutting edge 23. Therefore, in the present embodiment, at least the lower end of the central portion 35 is located on the front end side with respect to the end portion on the rear end side of the inclined cutting edge 27.

  That is, it is required that at least a part of the central portion 35 is positioned on the front end side with respect to the end portion on the rear end side in the inclined cutting edge 27, but the entire central portion 35 is not necessarily rearward in the inclined cutting edge 27. It does not have to be located on the tip side with respect to the end portion on the end side. Of course, the whole center part 35 may be located in the front end side rather than the edge part of the rear-end side in the inclined cutting edge 27. FIG. On the other hand, in order to make the region along the inclined cutting edge 27 on the upper surface 11 the scooping surface 31, the entire side portion 37, not a part of the side portion 37, is positioned on the rear end side of the inclined cutting edge 27. Is required.

  In order to stably process the chips generated by the first cutting edge 23 on the rising surface 33, it is necessary to shorten the distance D1 between the first cutting edge 23 and the central portion 35 in the direction along the central axis O1. Although desired, if the rising surface 33 protrudes excessively toward the first cutting edge 23, the area of the rake face 31 in the area along the inclined cutting edge 27 becomes narrow. Therefore, like the rising surface 33 in the present embodiment, it is preferable that the central portion 35 of the rising surface 33 is located on the rear end side with respect to the end portion on the front end side of the inclined cutting edge 27.

  The rising surface 33 in the present embodiment has a first inclined surface 39 and a second inclined surface 41 each having a flat surface shape. The first inclined surface 39 is located behind the first cutting edge 23. The second inclined surface 41 is located behind the inclined cutting edge 27. The second inclined surface 41 is inclined with respect to the first inclined surface 39. In short, the rising surface 33 has a first inclined surface 39 as a flat surface positioned so as to face the first cutting edge 23, and a second surface as a flat surface positioned so as to face the inclined cutting edge 27. An inclined surface 41 is provided.

  Note that the position behind the first cutting edge 23 means that when the first cutting edge 23 is moved to the rear end side along the central axis O1 in plan view, the rising surface 33 is the first cutting edge 23. It means that it is located in the area that overlaps. Similarly, being located behind the inclined cutting edge 27 means that the rising surface 33 overlaps the inclined cutting edge 27 when the inclined cutting edge 27 is moved to the rear end side along the central axis O1 in plan view. It means that it is located in the area.

In the case where the rising surface 33 has the first inclined surface 39 and the second inclined surface 41, chips generated by the first cutting edge 23 can be stably curved on the first inclined surface 39. In addition, chips generated by the inclined cutting edge 27 can be stably curved on the second inclined surface 41.

  At this time, in order to bend the chips more stably on the first inclined surface 39 and the second inclined surface 41, the first inclined surface 39 is parallel to the first cutting edge 23, and the second It is desirable that the inclined surface 41 is parallel to the inclined cutting edge 27. However, the term “parallel” here does not intend to be parallel in a strict sense, but intends that there may be a deviation of about 5 °.

  Whether or not the first inclined surface 39 is parallel to the first cutting edge 23 and the second inclined surface 41 is parallel to the inclined cutting edge 27 depends on the first cutting edge 23 and In the cross section parallel to the central axis O1 and intersecting the first inclined surface 39 and the second inclined surface 41, the angle formed by the first cutting edge 23 and the first inclined surface 39 and the inclined cutting edge 27 and the second Each angle formed with the inclined surface 41 may be evaluated.

  Further, the upper surface 11 in the present embodiment has a protrusion 43 in addition to the rake surface 31 and the rising surface 33. The protrusion 43 is located behind the first cutting edge 23 and surrounded by the rake face 31. The protrusion 43 is configured to protrude upward from the rake face 31 when the rake face 31 is used as a reference. When the protrusion 43 is provided, the chips generated by the first cutting edge 23 are deformed so as to correspond to the shape of the protrusion 43 when passing over the protrusion 43. This stabilizes the flow of the chips, so that it is possible to treat the chips satisfactorily.

<Modification>
Next, a modified example of the first embodiment will be described with reference to FIGS.

  The insert 1 in the above embodiment has a configuration in which the second cutting edge 25 is formed on each of the pair of second side surfaces 21. However, the insert of the present invention is not limited to this configuration. The insert 1 of the present modification has a pair of second side surfaces 21, but the second cutting edge 25 is provided only on one second side surface 21. When grooving as shown in FIG. 13 is performed, the insert 1 of this modification is effective.

  In the present modification, the ridgeline where the second side surface 21 on the side where the second cutting edge 25 is not formed on the pair of second side surfaces 21 and the upper surface 11 intersects has a linear shape. At this time, in order to avoid the ridgeline from interfering with the inner surface 15 of the machining groove, the ridgeline is inclined so as to approach the central axis O1 toward the rear end side.

  In addition, in the modification shown in FIGS. 12 and 13, the configuration shown in FIGS. 1 to 11 is the same as that of the embodiment shown in FIGS. It has the same configuration. Therefore, the description of the same configuration as the embodiment shown in FIGS.

<Second Embodiment>
Next, the insert 1 of 2nd Embodiment is demonstrated using FIG.

  The insert 1 of this embodiment has the same configuration of the cutting part 5 as the insert 1 of the first embodiment, but the structure of the main body part 3 is different. Therefore, the detailed description about the cutting part 5 is abbreviate | omitted, and the main-body part 3 is demonstrated in detail below.

The cutting insert 1 (hereinafter also simply referred to as the insert 1) of this embodiment is shown in FIGS.
As shown in FIG. 1, one main body 3 and three cutting parts 5 are provided. The main body 3 is a part fixed to the holder when the insert 1 is attached to the holder, as in the first embodiment. In the insert 1 of the first embodiment, the main body portion 3 has a rod shape extending from the rear end side toward the front end side, but the main body portion 3 in the present embodiment has a flat plate shape.

  Specifically, the main body 3 in the present embodiment has a flat plate shape having a pair of polygonal second main surfaces 45 and an outer peripheral side surface 47 located between the pair of second main surfaces 45. The pair of second main surfaces 45 have the same shape, and in the present embodiment, each has a substantially triangular shape. Since the pair of second main surfaces 45 have the same shape, they are not particularly shown, but they overlap each other when viewed from one side of the pair of second main surfaces 45. When the insert 1 is fixed to the holder of the cutting tool, one of the pair of second main surfaces 45 comes into contact with the holder.

  The main body 3 is located in the center when viewed from the side of one of the pair of second main surfaces 45. Further, the cutting portion 5 is located from the main body portion 3 to the corner portion of the second main surface 45. Since the second main surface 45 in the present embodiment is substantially triangular, there are three corners of the second main surface 45. Therefore, the insert 1 of the present embodiment is configured by one main body portion 3 and three cutting portions 5. The three cutting parts 5 are formed so as to be rotationally symmetric about an axis O3 connecting the centers of the pair of second main surfaces 45.

  The first main surface 11 and the first side surface 19 in each cutting portion 5 are respectively continuous with the outer peripheral side surface 47 in the main body portion 3, and the second side surface 21 in each cutting portion 5 is respectively the second main surface in the main body portion 3. It is continuous with the surface 45. Therefore, the first cutting edge 23 is orthogonal to the second main surface 45 and extends in a direction parallel to the axis O3. The second cutting edge 25 extends in a direction substantially orthogonal to the axis O3.

  Moreover, the rear end side in each cutting part 5 means the side close to the outer peripheral side surface 47 in the first main surface 11, and the front end side in each cutting part 5 is from the outer peripheral side surface 47 in the first main surface 11. Means the far side. Furthermore, when the first main surface 11 faces upward when the first main surface 11 of one cutting portion 5 is the upper surface, like the insert 1 of the first embodiment, the first main surface 11 faces. The direction on the opposite side of the direction is the downward direction.

  The length of one side of the triangular second main surface 45 in the insert 1 of the present embodiment is set to about 15 to 25 mm, for example. Moreover, the maximum value of the thickness of the insert 1 indicated by the width between the pair of second main surfaces 45 is set to, for example, about 2 to 8 mm.

  A through hole 49 is formed in the main body 3 so as to penetrate from one of the pair of second main surfaces 45 to the other. The through hole 49 is provided for inserting a screw when the insert 1 is fixed to the holder of the cutting tool with a screw. In addition, as a method of fixing the insert 1 to the holder, a clamp structure may be adopted instead of the above-described method using screw fixing.

  As mentioned above, although the insert 1 of several embodiment was demonstrated using drawing, the insert 1 of this invention is not limited to the structure of said embodiment, In the range which does not deviate from the summary of this invention, It includes modifications that are not specifically described in detail.

For example, in the first embodiment, the pair of second cutting edges 25 are axisymmetric with respect to the perpendicular bisector O2 of the first cutting edge 23 in plan view, but the second cutting edge 25 is not limited to such a configuration. Even when the second cutting edge 25 is formed on each of the pair of second side surfaces 21, the shapes of the second cutting edges 25 may be different from each other. Moreover, when the shapes of the pair of second cutting edges 25 are different from each other, at least one of the pair of second cutting edges 25 may be configured according to the gist of the present invention.

<Cutting tools>
Next, the cutting tool of one Embodiment of this invention is demonstrated using drawing.

  In the present embodiment, the insert 1 of the first embodiment is used as a representative of the above-described embodiment. Therefore, there is no problem even if the insert 1 of the second embodiment is used as a cutting insert.

  As shown in FIGS. 16 to 19, the cutting tool 101 according to the present embodiment includes a holder 105 having an insert pocket 103 (hereinafter also simply referred to as a pocket 103) on the distal end side, and a cutting blade 17 that is removed from the distal end side of the holder 105. And the above-mentioned cutting insert 1 mounted in the pocket 103 so as to protrude in the direction. In the present embodiment, the insert 1 is mounted in the pocket 103 so that the first cutting edge and the second cutting edge protrude outward from the front end side of the holder 105.

  The holder 105 in the present embodiment has an elongated bar shape. The direction extending elongated is coincident with the direction in which the central axis O1 of the insert 1 extends. One pocket 103 is provided on the front end side of the holder 105. The pocket 103 is a portion to which the insert 1 is attached, and is open to the front end surface of the holder 105.

  The holder 105 has an upper jaw portion 107 that restrains the upper side surface of the main body portion of the insert 1 and a lower jaw portion 109 that restrains the lower side surface of the main body portion of the insert 1 at the tip portion. A pocket 103 is formed by a region where the upper jaw portion 107 and the lower jaw portion 109 face each other. The body portion of the insert 1 is inserted and fixed between the pocket 103, that is, between the upper jaw portion 107 and the lower jaw portion 109. At this time, the upper surface of the main body comes into contact with the upper jaw 107 of the holder 105. In addition, the lower side surface of the main body abuts on the lower jaw 109 of the holder 105.

  Since the upper surface of the main body portion has the upper groove portion, a protrusion that contacts the upper groove portion is provided in a region of the upper jaw portion 107 that faces the lower jaw portion 109. Further, since the lower surface of the main body portion has a lower groove portion, a protrusion that contacts the lower groove portion is provided in a region of the lower jaw portion 109 facing the upper jaw portion 107. By inserting these protrusions into the upper and lower grooves of the insert 1, the insert 1 can be stably fixed to the holder 105.

  In the present embodiment, the holder 105 includes a first screw hole (not shown) formed in the upper jaw 107 and a second screw hole (not shown) formed below the screw hole in the lower jaw 109. The insert 1 is fixed to the holder 105 by fixing screws 111 inserted into these screw holes. That is, the fixing screw 111 is inserted into the first screw hole formed in the upper jaw portion 107, and the distal end of the fixing screw 111 is inserted into the second screw hole formed in the lower jaw portion 109. The first screw hole and the second screw hole are screwed together.

  As the holder 105, steel, cast iron, or the like can be used. In particular, it is preferable to use steel having high toughness among these members.

<Manufacturing method of cut product>
Next, the manufacturing method of the cut workpiece of one Embodiment of this invention is demonstrated using drawing.

The cut workpiece is produced by cutting a work material. The manufacturing method of the cut workpiece in the present embodiment includes the following steps. That is,
(1) rotating the work material 201;
(2) a step of bringing the cutting edge 17 of the cutting tool 101 represented by the above embodiment into contact with the rotating work material 201;
(3) a step of separating the cutting tool 101 from the work material 201;
It has.

  More specifically, first, as shown in FIG. 20, the work material 201 is rotated around the axis O <b> 4, and the cutting tool 101 is relatively brought closer to the work material 201. Next, as shown in FIG. 21, the cutting edge 17 in the cutting tool 101, specifically, the first cutting edge and the second cutting edge are brought into contact with the rotating work material 201, and the work material 201 is moved. To cut. Then, as shown in FIG. 22, the cutting tool 101 is relatively moved away from the work material 201.

  In the present embodiment, the cutting tool 101 is moved in the X1 direction in a state where the axis O4 is fixed and the work material 201 is rotated, thereby approaching the work material 201. In FIG. 21, the work material 201 is cut by bringing the cutting edge 17 of the cutting insert 1 into contact with the rotating work material 201. In FIG. 22, the cutting tool 101 is moved away in the X2 direction while the work material 201 is rotated.

  In the cutting in the manufacturing method of the present embodiment, the cutting tool 101 is moved to contact the work material 201 by moving the cutting tool 101 in each step, or the cutting tool 101 is separated from the work material 201. However, as a matter of course, it is not limited to such a form.

  For example, the work material 201 may be brought close to the cutting tool 101 in the step (1). Similarly, in the step (3), the work material 201 may be moved away from the cutting tool 101. In the case of continuing the cutting process, the state where the work material 201 is rotated and the cutting blade 17 in the insert 1 is brought into contact with a different part of the work material 201 may be repeated.

  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.

1. Cutting insert (insert)
DESCRIPTION OF SYMBOLS 3 ... Main-body part 5 ... Cutting part 7 ... Upper side surface 7a ... Upper side groove part 9 ... Lower side surface 11 ... 1st main surface (upper surface)
13 ... lower surface 15 ... side surface 17 ... cutting blade 19 ... first side surface 21 ... second side surface 23 ... first cutting blade 25 ... second cutting blade 27 ... Inclined cutting edge 29 ... Horizontal cutting edge 31 ... Rake face 33 ... Rising face 35 ... Central part 37 ... Side part 39 ... First inclined face 41 ... Second inclined face 43 ... Projection 45 ... Second main surface 47 ... Outer peripheral surface 49 ... Through hole 101 ... Cutting tool 103 ... Insert pocket (pocket)
105 ... Holder 107 ... Upper jaw 109 ... Lower jaw 111 ... Fixing screw 201 ... Work material

Claims (7)

A main surface extending from the rear end side toward the front end side; a first side surface adjacent to the main surface on the front end side; the main surface; a second side surface adjacent to the first side surface; Cutting for grooving including a cutting portion having a first cutting edge located on a ridge line intersecting the first side face and a second cutting edge located on a ridge line intersecting the main surface and the second side face. An insert,
The main surface is located on the front end side, and is a rake face that is inclined downward as it is away from the first cutting edge, and is located on the rear end side from the rake face and is away from the first cutting edge. And a rising surface that slopes upward according to
The second cutting edge is inclined so as to move away from the perpendicular bisector of the first cutting edge as viewed from the rear end side in plan view, and is provided for providing a chamfered portion at the opening of the machining groove. It has an inclined cutting edge that can function as a chamfering cutting edge ,
The rising surface includes a central portion located on the vertical bisector and a side portion adjacent to the second side surface in plan view,
The side portion is located on the rear end side with respect to the inclined cutting edge, and the center portion is located on the front end side with respect to the end portion on the rear end side in the inclined cutting edge , and
The center part is located in the back end side rather than the end part by the side of the tip in the above-mentioned inclined cutting edge, The cutting insert characterized by the above-mentioned. The cutting insert according to claim 1, wherein the rising surface is separated from the inclined cutting edge. The rising surface has a flat first inclined surface located behind the first cutting edge, and a flat second inclined surface located behind the inclined cutting edge, and the second inclined surface is cutting insert according to claim 1 or 2, characterized in that it is inclined with respect to the first inclined surface. Said first inclined surface is parallel to the first cutting edge and said second inclined surface, according to claim 3, characterized in that parallel to the inclined cutting edge Cutting insert. The second cutting edge is further provided with a horizontal cutting edge that is positioned closer to the front end side than the inclined cutting edge and is inclined so as to approach the vertical bisector of the first cutting edge toward the rear end side. The cutting insert as described in any one of Claims 1-4 characterized by the above-mentioned. A holder having an insert pocket on the tip side;
The cutting insert according to any one of claims 1 to 5 , wherein the first cutting edge and the second cutting edge are attached to the insert pocket so as to protrude outward from a tip side of the holder. A cutting tool characterized by comprising. A step of rotating the work material;
Contacting the first cutting edge and the second cutting edge of the cutting tool according to claim 6 with the rotating work material;
And a step of separating the cutting tool from the work material.

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