JPWO2018198929A1 - Slot mill insert and slot mill - Google Patents

Abstract

The slot mill insert according to one aspect includes a first surface, a second surface located on a side opposite to the first surface, a third surface located between the first surface and the second surface, a first surface and a first surface. And a through hole that opens on two surfaces. The third surface includes a plurality of rake face areas, a plurality of flank areas located between the plurality of rake face areas, and a cutting edge located on at least a part of a ridge line where the rake face area and the flank area intersect. It has. Each of the plurality of flank areas has a recess.

Description

  This aspect relates to an insert for a slot mill and a slot mill.

  2. Description of the Related Art A rotary tool provided with a cutting insert (hereinafter, referred to as an insert) is used when performing a cutting process such as grooving on a work material in order to manufacture a cut workpiece. WO 2012/173255 (Patent Document 1) describes a rotary tool (slot mill) used for slot machining, which is an example of cutting.

  The rotary tool described in Patent Literature 1 has a tool body (holder) having an insert mounting seat (pocket), an insert disposed on the insert mounting seat, and a mounting screw for fixing the insert to the insert mounting seat. I have. In the rotary tool described in Patent Literature 1, the rake face on the side surface of the insert has a flat surface area, and this flat surface area is in contact with a pocket serving as an insert mounting seat.

  In the slot mill described in Patent Literature 1, a load is applied to the insert in a direction rotating around the mounting screw. For this reason, when the slot mill described in Patent Document 1 is used for a long time, the fixing of the insert is unstable due to the load being applied to the mounting screw, the mounting screw being loosened, or the mounting screw being deteriorated. Could be.

  In view of the above, there has been a demand for an insert that can be stably fixed to a holder.

  An insert for a slot mill according to one aspect includes a first surface, a second surface located opposite to the first surface, a third surface located between the first surface and the second surface, It has a through hole that opens on the first surface and the second surface. The third surface is located at at least a part of a ridge line where the rake surface region and the flank region intersect, and a plurality of rake surface regions, a plurality of flank regions located between the plurality of rake surface regions, respectively. Cutting edge. Each of the plurality of flank areas has a recess.

It is a perspective view showing an insert of an embodiment. It is a front view of the 1st surface in the insert shown in FIG. It is a side view from the A1 direction of the insert shown in FIG. It is sectional drawing of B1-B1 of the insert shown in FIG. FIG. 3 is a side view of the insert shown in FIG. 2 as viewed from the direction A2. It is sectional drawing of B2-B2 of the insert shown in FIG. It is a perspective view showing the rotary tool of a 1st embodiment. FIG. 8 is an enlarged view of a region C1 shown in FIG. 7. It is a perspective view of the holder in the rotary tool shown in FIG. FIG. 10 is an enlarged view of a region C2 shown in FIG. 9. It is a front view in the rotary tool shown in FIG. FIG. 12 is an enlarged view of a region C3 shown in FIG. It is the side view which looked at the rotary tool shown in FIG. 7 from A3 direction. It is a perspective view showing a rotary tool of a 2nd embodiment. FIG. 15 is an enlarged view of a region C4 shown in FIG. 14. It is a perspective view of the holder in the rotary tool shown in FIG. FIG. 17 is an enlarged view of a region C5 shown in FIG. 16. It is a front view in the rotary tool shown in FIG. FIG. 19 is an enlarged view of a region C6 shown in FIG. 18. It is the side view which looked at the rotary tool shown in FIG. 14 from A4 direction. It is a schematic diagram showing one process of a manufacturing method of a cutting work of an embodiment. It is a schematic diagram showing one process of a manufacturing method of a cutting work of an embodiment. It is a schematic diagram showing one process of a manufacturing method of a cutting work of an embodiment.

  Hereinafter, an insert for a slot mill (hereinafter, simply referred to as an insert) according to an embodiment will be described in detail with reference to the drawings. However, in each drawing referred to below, for convenience of explanation, only the main members necessary for describing the embodiment are shown in a simplified manner. Accordingly, the insert may include any components not shown in the referenced figures. The dimensions of the members in the drawings do not accurately represent the dimensions, dimensional ratios, and the like of the actual constituent members.

<Insert>
The insert 1 of the embodiment is suitably used, for example, as an insert 1 in a rotary tool such as a slot mill. The insert 1 according to the present disclosure has a first surface 3, a second surface 5, a third surface 7, and a through hole 9, and for example, may be a flat plate as a whole as shown in FIG.

  Although the first surface 3 is not limited to a specific shape, in an example shown in FIG. 2, the polygon has a plurality of corners and sides, and has a shape in which some of the corners and sides are cut out. ing. Specifically, as in the example shown in FIG. 2, the first surface 3 is formed by one of each of the three corners 2 a and each of the sides forming the three corners 2 a in the triangle 2 indicated by the two-dot chain line. The portion may have a notched shape. At this time, the three sides may be positioned so as to have a rotational symmetry of 120 ° about the central axis O1 in a front view of the first surface 3.

  As in the example shown in FIG. 2, the first surface 3 may be cut out in an arc shape so as to be concave with respect to each of the three corners 2a. At this time, the first surface 3 does not need to have a configuration cut out in an arc shape. For example, the first surface 3 may be cut out in a concave curve shape that is not limited to an arc, or the corner 2a may be formed by one or more straight lines. May be cut out.

  The first surface 3 is not limited to the shape shown in FIG. For example, the first surface 3 is an n-sided polygon (n is an integer greater than 3), and each of the n corners and a part of each of the sides constituting the n corners are cut out. It may be. At this time, the n sides may be positioned so as to be 360 ° / n rotationally symmetric about the central axis O1 in the front view of the first surface 3.

  The second surface 5 is a surface located on the opposite side of the first surface 3 and may have substantially the same shape as the first surface 3. Although not particularly shown, the second surface 5 has the three corners 2a in the triangle 2 and a part of each of the sides forming the three corners 2a in the triangle 2 cut out similarly to the first surface 3. It may be shaped. The second surface 5 does not need to have exactly the same shape as the first surface 3 and may be slightly different.

  The third surface 7 is located between the first surface 3 and the second surface 5. As in the example shown in FIG. 1, the third surface 7 may be connected to the first surface 3 and the second surface 5. When the first surface 3 and the second surface 5 have substantially the same shape as in the example shown in FIG. 1, the third surface 7 is substantially orthogonal to the first surface 3 and the second surface 5, respectively. Is also good.

  When the first surface 3 and the second surface 5 each have a polygonal shape in which the corners 2a are cut out, the third surface 7 has a plurality of flat surface regions and a plurality of curved surface regions. It may be a configuration. The flat surface region in the example shown in FIG. 1 is a region connected to each side of each of the first surface 3 and the second surface 5 in the third surface 7. The curved surface region in the example shown in FIG. 1 is a region connected to a cutout portion on each of the first surface 3 and the second surface 5.

  The size of the insert 1, that is, the size of the first surface 3, the second surface 5, and the third surface 7 is not limited to a specific value. For example, the maximum width of the first surface 3 and the second surface 5 may be set to 5 to 20 mm. Further, the width of the third surface 7, that is, the thickness of the insert 1, may be set to 1 to 4 mm.

  The insert 1 of the embodiment has a through hole 9 that opens on the first surface 3 and the second surface 5. Hereinafter, the portion opened on the first surface 3 is referred to as a first opening region 9a, and the portion opened on the second surface 5 is referred to as a second opening region 9b.

  The through hole 9 may be used to fix the insert 1 to a holder. For example, as described later, a first screw provided in the holder is inserted by inserting a first screw from a first opening region 9a of the through hole 9 and projecting the first screw from a second opening region 9b of the through hole 9. The insert 1 may be fixed to the holder by engaging the hole. By removing the first screw, the insert 1 can be removed from the holder.

  In the embodiment, the first opening region 9 a is located at the center of the first surface 3, and the second opening region 9 b is located at the center of the second surface 5. Therefore, the axis of the through hole 9 coincides with the center axis O1 of the insert 1.

  The third surface 7 in the example illustrated in FIG. 1 includes a plurality of rake surface regions 11, a plurality of flank regions 13, and a plurality of cutting edges 15. The rake face area 11 refers to an area in which chips generated by the cutting edge 15 during cutting work flow. At this time, chips may or may not contact the rake face area 11. The flank region 13 is a surface that has little contact with the finished surface during cutting in order to reduce the possibility that the finished surface will deteriorate due to contact and increase friction heat. In the case where the work material is a metal member or the like that is elastically deformed, the flank surface region 13 may come into contact with the finished surface during cutting.

  The plurality of rake face regions 11 may be located forward from the corresponding cutting blades 15 in the rotational direction. For example, the plurality of rake face areas 11 may correspond to areas connected to portions of the first surface 3 and the second surface 5 where the corners 2a are cut out. The third surface 7 in the example shown in FIG. 2 has three rake face regions 11.

  In an example shown in FIG. 1, the first surface 3 and the second surface 5 in a front view of the first surface are configured such that a portion connected to the rake area 11 is cut out in a concave curve shape, specifically, Since it is configured to be cut out in an arc shape, the plurality of rake face regions 11 each have a curved concave curved surface shape.

  As described above, when the first surface 3 and the second surface 5 have a configuration in which the corners are cut off by one or more straight lines, the plurality of rake face regions 11 are each one or more flat surfaces. The shape may be a combination of surfaces.

  However, when the plurality of rake face areas 11 have curved concavely curved surfaces, clogging of chips generated in the cutting process is suppressed, and the chip dischargeability is high. In particular, in the case where the first surface 3 and the second surface 5 are cut out in an arc shape, the chip discharge performance is further enhanced.

  The plurality of flank regions 13 on the third surface 7 are located rearward in the rotational direction from the corresponding cutting blades 15. Each flank area 13 is located between the plurality of rake face areas 11. The plurality of flank regions 13 in the embodiment correspond to regions connected to the sides of each of the first surface 3 and the second surface 5. The third surface 7 in the example shown in FIG. 2 has three flank regions 13. Since the plurality of flank regions 13 in the example shown in FIG. 1 are connected to the sides of the first surface 3 and the second surface 5, respectively, the flank regions 13 have a flat surface shape. .

  The adjacent rake face area 11 and flank face area 13 intersect to form a ridge line. The cutting edge 15 is located at least partially on this ridgeline. In the example shown in FIG. 2, since the third surface 7 has three rake surface regions 11 and three flank regions 13, there are six ridge lines described above. And the cutting edge 15 may be located in at least one part in each of these six ridgelines. Therefore, the insert 1 may have six cutting edges 15.

  When the six cutting edges 15 are respectively located over the entire ridge line where the adjacent rake face region 11 and the flank area 13 intersect, the six cutting edges 15 are located on the third surface 7 on the side of the first surface 3. It may be rephrased that it is located from the end to the end on the second surface 5 side.

  Note that the six cutting edges 15 need not be used for cutting at the same time, and any one cutting edge 15 may be used for cutting. Then, when the cutting edge 15 is deteriorated by a long-time cutting process, the insert 1 may be once removed from the holder, and then the insert 1 may be changed in direction and attached to the holder again. Thereby, the other unused cutting blades 15 can be used for cutting the work material.

  A so-called honing process may be applied to the ridgeline where the rake face area 11 and the flank face area 13 intersect and where the cutting edge 15 is formed. That is, the ridge line where the rake face area 11 and the flank face area 13 intersect may not be a strict line shape due to the intersection of the two faces. If the ridgeline is linear, the strength of the cutting edge 15 may be reduced. For example, a curved surface R Honing may be applied.

  Each of the plurality of flank regions 13 in the embodiment has a concave portion 17. By engaging the concave portion 17 with the convex portion of the holder, even if a force for rotating the first screw around the first screw is applied to the insert 1 during cutting, the engagement between the convex portion and the concave portion 17 is achieved. In some cases, the insert 1 is locked. Therefore, the insert 1 is easily fixed stably to the holder.

  In addition, from the viewpoint of suppressing the rotation of the insert 1 around the first screw, the flank region 13 may have a convex portion and the holder may have a concave portion to be engaged with the convex portion. Good. However, from the viewpoint of reducing the possibility that the flank region 13 comes into contact with the finished surface of the work material, a configuration in which the flank region 13 has the concave portion 17 and the holder has the convex portion as in the embodiment is used. It is valid.

  Further, from the viewpoint of suppressing the rotation of the insert 1 around the first screw, the rake face region 11 may further have a concave portion and the holder may have a convex portion to be engaged with the concave portion. Good. However, from the viewpoint of suppressing clogging of chips in the rake face area 11, a configuration in which the flank area 13 has the concave portion 17 and the holder has the convex portion as in the embodiment is effective.

  The insert 1 in the example shown in FIG. 1 has a plurality of rake face regions 11. When the first surface 3 is viewed from the front, the rake face areas 11 adjacent to each other among the plurality of rake face areas 11 move away from each other as the rake face areas 13 located between these rake face areas 11 move away from each other. It may be located as follows. In other words, the rake face areas 11 adjacent to each other may be closest to a point where the rake face areas 11 are connected to the flank face areas 13 located between the rake face areas 11.

  In addition, when the first surface 3 is viewed from the front, the rake face areas 11 adjacent to each other are located at positions separated from the flank face 13 located between these rake face areas 11 as in the example shown in FIG. May be the closest.

  For example, in the example shown in FIG. 2, the portions of the rake face regions 11 adjacent to each other that are closest to each other are located between the through-hole 9 and the concave portion 17. Specifically, when the first surface 3 is viewed from the front, a straight line X1 connecting two closest points in the rake face region 11 adjacent to each other passes between the through-hole 9 and the concave portion 17, and It does not intersect with the through hole 9 and the concave portion 17. When the rake face areas 11 adjacent to each other are located as described above, the thickness of the insert 1 between the rake face areas 11 adjacent to each other is ensured, and the durability of the insert 1 is high.

  Although the size of the concave portion 17 is not limited to a specific value, for example, when the flank region 13 is viewed from the front as shown in FIG. 3, the flank region 13 in a direction orthogonal to the central axis O1 is provided. Is the width L, and the width of the recess 17 in the direction orthogonal to the central axis O1 is the first width W1, the first width W1 of the recess 17 can be set to 0.1L to 0.8L.

  When the first width W1 of the concave portion 17 is 0.1 L or more, the width of the convex portion to be engaged with the concave portion 17 is likely to be increased, so that there is little possibility that the convex portion is broken and the durability of the holder is reduced. high. When the first width W1 of the concave portion 17 is 0.8 L or less, the thickness of the insert 1 between the concave portion 17 in the flank region 13 and the rake surface region 11 adjacent to the flank region 13 is set. Therefore, the durability of the insert 1 is high.

  In particular, since the flank region 13 is located between the two rake surface regions 11, each of the concave portion 17 in the flank region 13 and the two rake surface regions 11 adjacent to the flank region 13 is formed. From the viewpoint of securing the thickness of the insert 1 between them, it is effective that the recess 17 is configured to be recessed toward the through hole 9.

  Further, the depth of the concave portion 17 is not limited to a specific value. For example, the depth D of the concave portion 17 can be set to 0.1 L to 0.5 L. When the depth D of the concave portion 17 is 0.1 L or more, the height of the convex portion engaged with the concave portion 17 is easily increased, so that the rotation of the insert 1 around the first screw by the convex portion is prevented. High suppression effect. Further, when the depth D of the concave portion 17 is 0.5 L or less, the thickness of the insert 1 between the concave portion 17 and the through hole 9 is easily secured, so that the durability of the insert 1 is high.

  The shape of the concave portion 17 is not limited to a specific configuration. As in the example shown in FIG. 4, in a cross section orthogonal to the central axis O1 of the through hole 9, the concave portion 17 may have an arc shape. In the cross section shown in FIG. 4, the rake face region 11 also has an arc shape.

  In the example shown in FIG. 4, the radius of curvature of the rake face region 11 is larger than the radius of curvature of the concave portion 17. When the radius of curvature of the rake face region 11 is relatively large, clogging of chips is less likely to occur, and chip dischargeability is high. When the radius of curvature of the concave portion 17 is relatively small, the effect of suppressing the rotation of the insert 1 around the first screw is high.

  In the example shown in FIG. 1, the recess 17 extends from the first surface 3 to the second surface 5. When the concave portion 17 has such a shape, the concave portion 17 of the insert 1 easily engages with the convex portion of the holder, and the attachment of the insert 1 to the holder becomes easy.

  When the concave portion 17 extends from the first surface 3 to the second surface 5, a crack is generated in the cutting blade 15 used during the cutting process, and the crack is formed along the flank region 13. Even if it progresses, the progress of the crack in the concave portion 17 is easily stopped.

  Therefore, there is little possibility that the above-mentioned crack will propagate to another cutting edge 15 adjacent to the cracked cutting edge 15 with the flank region 13 interposed therebetween. As a result, it is easy to prevent the unused cutting blade 15 from being unusable due to the crack, and the increase in cost due to replacement of the insert 1 is suppressed.

  When the concave portion 17 extends from the first surface 3 to the second surface 5 as described above, the first width W1 of the concave portion 17 is constant from the first surface 3 side to the second surface 5 side. Or it may be changing. For example, as in the example shown in FIG. 3, the first width W1 of the recess 17 at the end on the side of the first surface 3 is larger than the first width W1 of the recess 17 at the end on the side of the second surface 5. Is also good.

  When the first width W1 of the recess 17 at the end on the side of the first surface 3 is larger than the first width W1 of the recess 17 at the end on the side of the second surface 5, for example, as described later, When the second screw is used instead of the convex portion of the holder as a portion to be engaged with the concave portion 17, a space for accommodating the screw head of the second screw is easily secured in the concave portion 17. Therefore, it is possible to use either the convex part of the holder or the second screw as the part to be engaged with the concave part 17. Therefore, the versatility of the insert 1 is high.

  Specifically, the concave portion 17 in the example shown in FIG. 3 has a first region 17a, a second region 17b, a third region 17c, and a fourth region 17d. The first region 17a to the fourth region 17d are located in order from the first surface 3 toward the second surface 5 when the flank region 13 is viewed from the front.

  More specifically, the first region 17a in the example shown in FIG. 3 is located at an end of the concave portion 17 on the side of the first surface 3, and the first width W1 in the first region 17a is a flank. When the area 13 is viewed from the front, the area 13 becomes larger toward the second surface 5. The second region 17b in the example shown in FIG. 3 extends from the first region 17a toward the second surface 5, and the first width W1 in the second region 17b is such that the flank region 13 is viewed from the front. In this case, the distance becomes smaller toward the second surface 5.

  When the recess 17 has the first region 17a and the second region 17b, when the second screw is used as a portion to be engaged with the recess 17, the screw head of the second screw is used. Is easily secured in the recess 17. Since the first width W1 in the first region 17a and the second region 17b changes as described above, the first width W1 of the concave portion 17 in the example shown in FIG. It has the maximum value at the boundary of the area 17b.

  Further, the third region 17c in the example shown in FIG. 3 extends from the second region 17b toward the second surface 5, and the first width W1 in the third region 17c is such that the flank region 13 is It is constant when viewed. The fourth region 17d in the example shown in FIG. 3 is located from the third region 17c to the second surface 5, and the first width W1 in the fourth region 17d is such that when the flank region 13 is viewed from the front, It becomes smaller toward the second surface 5.

  When the concave portion 17 has the third region 17c, the concave portion 17 and the convex portion or the second screw are easily stably contacted. Therefore, the insert 1 is easily fixed stably to the holder. In particular, when the ridgeline where the flat surface 13a and the third region 17c in the flank region 13 intersect is parallel to the central axis O1, a force that rotates around the first screw is applied to the insert 1 during cutting. Even in this case, the insert 1 is easily locked in the recess 17. Therefore, the insert 1 is easily fixed stably by the holder.

  The cutting blade 15 may have a linear shape as a whole, or may have a curved shape as a whole, or may have a partially linear shape and another partially curved shape. For example, as in an example shown in FIG. 3, the cutting blade 15 may have a first corner blade 15a and a first straight blade 15b.

  In the example shown in FIG. 3, the first corner blade 15a is located at an end of the cutting blade 15 on the side of the first surface 3, and has a curved shape protruding outward. The first straight blade 15b extends from the first corner blade 15a toward the second surface 5, and has a straight shape. When the cutting blade 15 has the first corner blade 15a, the durability of the cutting blade 15 is high. When the cutting blade 15 has the first straight blade 15b, the smoothness of the finished surface of the work material is improved.

  Here, when the cutting blade 15 is viewed from the side of the rake face region 11 in front, the first straight blade 15b may be parallel to the central axis O1, and as in the example shown in FIG. The distance may be closer to the central axis O1 as the distance from the one corner blade 15a increases.

  When viewed from the front of the rake face region 11, when the first straight blade 15b approaches the central axis O1 as the distance from the first corner blade 15a increases, chips are less likely to be clogged. This is because when the first straight blade 15b is inclined as described above, the chips tend to flow not in the direction orthogonal to the central axis O1 but in the direction inclined to the first surface 3 from this direction. Because. This makes it easier for the chips to be formed into a spiral shape instead of a spiral shape, so that the chips are less likely to be clogged.

  When the concave portion 17 has a first region 17a, a second region 17b, a third region 17c, and a fourth region 17d, and the cutting blade 15 has a first corner blade 15a and a first straight blade 15b, the flank region The width of the first region 17a in the direction along the central axis O1 when the front view of the device 13 is viewed is referred to as a second width W2. When the flank region 13 is viewed from the front, the width of the first corner blade 15a in the direction along the central axis O1 is defined as a third width W3.

  At this time, the second width W2 may be the same as the third width W3, as in the example shown in FIG. As described above, the first width W1 of the concave portion 17 in the example shown in FIG. 3 has a maximum value at the boundary between the first region 17a and the second region 17b. Therefore, the flank area 13 on the side closer to the first surface 3 than the boundary between the first area 17a and the second area 17b where the first width W1 of the concave portion 17 has the maximum value, that is, in the portion where the first area 17a is located It is effective to reduce the cutting load on the insert 1 from the viewpoint of the durability of the insert 1. When the second width W2 is the same as the third width W3, since the first corner blade 15a is positioned in accordance with the width of the first region 17a in the direction along the central axis O1, the durability of the insert 1 is improved. Is high.

  Further, the cutting blade 15 may further include a second corner blade 15c in addition to the first corner blade 15a and the first straight blade 15b, as in the example shown in FIG. The second corner blade 15c in the example shown in FIG. 3 is located at the end of the cutting blade 15 on the side of the second surface 5, and has a linear shape. At this time, the second corner blade 15c may be inclined with respect to the first straight blade 15b when viewed from the front of the rake face region 11 side.

  The second cutting edge 15c is located at an end of the cutting edge 15 on the side of the second surface 5 and is inclined with respect to the first straight edge 15b when viewed from the rake face region 11 side. , The durability of the cutting blade 15 is high.

  From the viewpoint of improving the durability of the insert 1, the second corner blade 15c may have a curved shape protruding outward similarly to the first corner blade 15a. On the other hand, when the second corner blade 15c has a linear shape inclined with respect to the first straight blade 15b, the durability of the insert 1 can be improved while the second corner blade 15c has a simple structure that can be manufactured at low cost. Is high.

  This is because, as in the example shown in FIG. 3, the first width W1 of the recess 17 at the end on the side of the first surface 3 is larger than the first width W1 of the recess 17 at the end on the side of the second surface 5. In this case, the thickness of the insert 1 between the second corner blade 15c and the recess 17 is larger than the thickness between the first corner blade 15a and the recess 17.

  As described above, the flank region 13 may have a flat surface shape. Here, as shown in FIG. 1, when the concave portion 17 extends from the first surface 3 to the second surface 5, the flank region 13 is formed between two adjacent rake surface regions 11 and the concave portion 17. It may be regarded as having two flat surfaces 13a located respectively.

  When the flank region 13 has the flat surface 13a, there is little possibility that the flank region 13 comes into contact with the finished surface of the work material.

  The above-mentioned flank area 13 may have a configuration in which the cutting edge 15 is located on each of the ridge lines between two adjacent rake face areas 11. Here, when the flank region 13 is viewed from the front, when the two flat surfaces 13 a are line-symmetric with respect to the center axis of the concave portion 17, no matter which of these two cutting edges 15 is used. The possibility that the flank area 13 contacts the finished surface of the work material is small.

  Examples of the material of the insert 1 include a cemented carbide and a cermet. Examples of the composition of the cemented carbide include WC-Co, WC-TiC-Co, and WC-TiC-TaC-Co. Here, WC (tungsten carbide), TiC (titanium carbide), and TaC (tantalum carbide) are hard particles, and Co (cobalt) is a binder phase.

  Cermet is a sintered composite material in which a metal is combined with a ceramic component. Specifically, the cermet includes a titanium compound containing TiC or TiN (titanium nitride) as a main component.

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

<Rotating tool>
Next, the rotary tool 101 according to the first embodiment will be described with reference to FIGS. FIGS. 7 to 8 and FIGS. 11 to 13 show a state where the insert 1 is attached to the pocket 105 of the holder 103 by the first screw 107. 9 and 10 show the holder 103 from which the insert 1 has been removed (not attached). Note that the two-dot chain line in FIG. 7 and the like indicates the rotation axis O2 of the rotary tool 101.

  The rotary tool 101 of the present embodiment includes an insert 1, a holder 103, and a first screw 107. The rotary tool 101 in the present embodiment is a tool used for milling for forming a narrow groove.

  The holder 103 in the present embodiment has a thin disk shape, and has a rotation axis O2 extending in a direction orthogonal to a plane portion. The holder 103 has a first end surface 109, a second end surface 111, an outer peripheral surface 113, and a pocket 105.

  The second end face 111 is located on the opposite side of the first end face 109, and the first end face 109 and the second end face 111 are each substantially circular. The outer peripheral surface 113 is located between the first end surface 109 and the second end surface 111, and intersects with each of the first end surface 109 and the second end surface 111.

  A pocket 105 to which the insert 1 is attached is located on an outer peripheral portion of the disc-shaped holder 103. That is, the rotary tool 101 of the present embodiment is configured to include the holder 103 having the pocket 105 located on the outer peripheral portion and the insert 1 located in the pocket 105. The holder 103 in the present embodiment has a plurality of pockets 105. The insert 1 is attached to each pocket 105. That is, the rotary tool 101 of the present embodiment has a plurality of inserts 1.

  The plurality of pockets 105 in the present embodiment are constituted by a first pocket 105a and a second pocket 105b. The first pocket 105a is located on the outer peripheral side of the first end face 109 of the holder 103, and is open to the first end face 109 and the outer peripheral face 113. Further, the first pocket 105a has a first screw hole 115a that opens toward the first end face 109.

  The second pocket 105b is located on the outer peripheral side of the second end face 111 of the holder 103, and opens to the second end face 111 and the outer peripheral face 113. The second pocket 105b has a first screw hole 115b that opens toward the second end surface 111.

  The holder 103 in the present embodiment has a plurality of first pockets 105a and a plurality of second pockets 105b, but has a configuration having only one first pocket 105a and only one second pocket 105b. You may.

  The insert 1 is located in the first pocket 105a and the second pocket 105b such that at least a part of the cutting edge protrudes outward from the outer peripheral surface 113 of the holder 103. The insert 1 is attached to the first pocket 105a and the second pocket 105b such that the second surfaces are in contact with each other.

  First screw holes 115a and 115b corresponding to through holes of the insert 1 are formed in the first pocket 105a and the second pocket 105b, respectively. In the present embodiment, the insert 1 is fixed to the first pocket 105a and the second pocket 105b by inserting the first screw 107 into the through hole of the insert 1 and fixing the insert 1 to the first screw hole 115.

  The pocket 105 in the present embodiment has a convex portion 117 that is engaged with the concave portion of the insert 1. By engaging the convex portion 117 of the pocket 105 with the concave portion of the insert 1, even when a force for rotating the insert 1 around the first screw 107 is applied to the insert 1 during the cutting process, the convex portion 117. The insert 1 will be locked. Therefore, the insert 1 can be fixed to the holder 103 stably.

  In addition, as the holder 103, steel, cast iron, or the like can be used. In particular, it is preferable to use steel having high toughness among these materials.

  Next, a rotary tool 201 according to a second embodiment will be described with reference to FIGS. FIGS. 14 to 15 and FIGS. 18 to 20 show a state where the insert 1 is attached to the pocket 205 of the holder 203 by the first screw 207. 16 and 17 show the holder 203 from which the insert 1 has been removed (not attached). Note that the two-dot chain line in FIG. 14 and the like indicates the rotation axis O2 of the rotary tool 201. In the rotary tool 201 according to the second embodiment, a description of a portion having the same configuration as the rotary tool 101 according to the first embodiment will be omitted.

  The rotary tool 201 according to the present embodiment includes an insert 1, a holder 203, a first screw 207, and a second screw 217. The rotary tool 201 in the present embodiment is a tool used for milling for forming a thin groove, like the rotary tool 101 according to the first embodiment.

  The holder 203 in the present embodiment has a thin disk shape like the holder 103 in the rotary tool 101 of the first embodiment, and has a rotation axis O2 extending in a direction orthogonal to a plane portion. . The holder 203 has a first end surface 209, a second end surface 211, an outer peripheral surface 213, and a pocket 205.

  The pocket 205 in the present embodiment includes a first pocket 205a and a second pocket 205b, like the holder 103 in the rotary tool 101 of the first embodiment.

  The first pocket 205a in the present embodiment includes a second screw hole 219a that opens toward the first end surface 209 in addition to the first screw hole 215a. The second pocket 205b also has a second screw hole 219b that opens toward the second end surface 211 in addition to the first screw hole 215b.

  First screw holes 215 corresponding to the through holes of the insert 1 are formed in the first pocket 205a and the second pocket 205b, respectively. In the present embodiment, the insert 1 is fixed to the first pocket 205a and the second pocket 205b by inserting the first screw 207 into the through hole of the insert 1 and fixing the first screw 207 to the first screw hole 215.

  Further, a second screw hole 219 is formed in each of the first pocket 205a and the second pocket 205b. The second screw hole 219 is located so as to correspond to the concave portion of the insert 1. The second screw 217 is fixed to the second screw hole 219.

  At this time, the second screw 217 is fixed to the second screw hole 219 such that the second screw 217 comes into contact with the concave portion of the insert 1. When the second screw 217 abuts on the recess of the insert 1, even when a force for rotating the first screw 207 around the first screw 207 is applied to the insert 1 during cutting, the insert 1 is moved by the second screw 217. Will be locked. Therefore, the insert 1 can be fixed to the holder 203 stably. That is, the second screw 217 in the present embodiment has the same function as the convex portion 117 in the first embodiment.

  Further, in the rotary tool 201 of the present embodiment, since the pocket 205 does not have the convex portion 117, the work of attaching the insert 1 to the pocket 205 becomes easier as compared with the rotary tool 101 of the first embodiment.

  In the example shown in FIG. 19, the pocket 205 includes a first constraint portion 221 that contacts one of the plurality of rake face regions, and a second constraint portion 223 that contacts the other one of the plurality of rake face regions. I have. Here, when the first end face 209 is viewed from the front, when the first screw hole is eccentric toward a virtual straight line connecting the first constraint part 221 and the second constraint part 223 rather than the through hole, the insert 1 It is pressed toward the first constraint part 221 and the second constraint part 223. Therefore, the binding force of the insert 1 on the pocket 205 is increased.

  In the case where the pocket 205 includes the first restraining portion 221 and the second restraining portion 223, when the first restraining portion 221 and the second restraining portion 223 are away from the cutting edge, respectively, the first restraining portion 221 and the second restraining portion 223 are not separated. The damage of the cutting blade due to the contact of the second restraining portion 223 with the cutting blade is easily avoided.

  When the first end surface 209 is viewed from the front, when the second screw hole 219 is eccentric to the cutting edge protruding outward from the outer peripheral surface 213 than the concave portion, the insert 1 is held by the holder 203. It is possible to stably fix. This is because a force is applied to the recess from the second screw 217 in a direction opposite to the rotating force around the first screw 207 applied to the cutting blade during the cutting process.

<Manufacturing method of cut workpiece>
Next, a method for manufacturing a cut workpiece will be described with reference to FIGS. 21 to 23 show a method of manufacturing a cut product. 21 to 23 indicate the rotation axis O2 of the rotary tool 101. The cut workpiece is produced by cutting the work material 301. The cutting method according to the embodiment includes the following steps. That is,
(1) rotating the rotary tool 101 represented by the above embodiment;
(2) contacting the insert of the rotating rotary tool 101 with the workpiece 301;
(3) a step of separating the rotary tool 101 from the work material 301;
It has.

  More specifically, first, as shown in FIG. 21, the rotary tool 101 is relatively approached to the work material 301 while rotating around the rotation axis O2. Next, as shown in FIG. 22, the rotating tool 101 is brought into contact with the workpiece 301 to cut the workpiece 301. In the embodiment, the cutting blade of the insert 1 is in contact with the work material 301. Then, as shown in FIG. 23, the rotary tool 101 is relatively moved away from the work material 301.

  21 to 23 show an example in which the work material 301 is fixed and the rotary tool 101 is rotated around the rotation axis O2. Specifically, in FIG. 21, the work material 301 is fixed, and the rotary tool 101 is approached. FIG. 23 shows an example in which the rotary tool 101 is kept away from the work material 301.

  In the above description, an example in which the work material 301 is fixed and the rotary tool 101 is moved in each step has been described, but it is needless to say that the present invention is not limited to such a form.

  For example, in the step (1), the work material 301 may be brought closer to the rotary tool 101. Similarly, in the step (3), the work material 301 may be moved away from the rotary tool 101. When the cutting is continued, the step of bringing the cutting edge of the insert into contact with different portions of the work material 301 while maintaining the state in which the rotary tool 101 is rotated may be repeated. When the used cutting edge is worn, an unused cutting edge may be used by rotating the insert around the central axis of the through hole by 120 °. Note that typical examples of the material of the work material 301 include carbon steel, alloy steel, stainless steel, cast iron, and non-ferrous metals.

1 ... insert (insert)
3 1st surface 5 2nd surface 7 3rd surface 9 ... through-hole 9a 1st opening area 9b 2nd opening area 11 ... rake face area 13 ··· Flank surface 13a ··· Flat surface 15 ··· Cutting edge 15a ··· First corner blade 15b ··· First straight blade 15c ··· Second corner blade 17 ··· Recess 17a ··· First region 17b. Second region 17c third region 17d fourth region 101 rotating tool 103 holder 105 pocket 105a first pocket 105b second pocket 107 first Screw 109 first end surface 111 second end surface 113 outer peripheral surface 115 first screw hole 117 convex portion 201 rotating tool 203 holder 205 Pocket 205a-first pocket 205b-second pocket 207 1st screw 209 1st end face 211 2nd end face 213 outer peripheral face 215 1st screw hole 217 2nd screw 219 2nd screw hole 221・ First constraint part 223 ・ ・ ・ Second constraint part 301 ・ ・ ・ Work material

Claims (17)

A first surface, a second surface located on the opposite side of the first surface, a third surface located between the first surface and the second surface, and an opening in the first surface and the second surface. Having a through-hole,
The third surface is located at at least a part of a ridge line where the rake surface region and the flank region intersect, and a plurality of rake surface regions, a plurality of flank regions located between the plurality of rake surface regions, respectively. With a cutting blade
The slot mill insert, wherein each of the plurality of flank regions has a recess.   The insert for a slot mill according to claim 1, wherein each of the plurality of rake face regions has a concave curved surface shape.   3. The cross-section orthogonal to the central axis of the through-hole, wherein the rake face region and the concave portion each have an arc shape, and a radius of curvature of the rake surface region is larger than a radius of curvature of the concave portion. 4. Insert for slot mill.   4. The slot mill insert according to claim 1, wherein the flank region has two flat surfaces located between two adjacent rake surface regions and the concave portion. 5. .   The slot mill insert according to claim 4, wherein the two flat surfaces are line-symmetric with respect to the concave portion when the flank region is viewed from the front.   The insert for a slot mill according to any one of claims 1 to 5, wherein the recess is recessed toward the through hole.   The insert for a slot mill according to any one of claims 1 to 6, wherein the recess extends from the first surface to the second surface. When the flank region is viewed from the front, when the width of the concave portion in a direction orthogonal to the central axis of the through hole is a first width,
The slot mill insert according to claim 7, wherein the first width of the recess at the end on the first surface side is larger than the first width of the recess at the end on the second surface side. . The recess is, when the flank area is viewed from the front,
A first region located at an end on the side of the first surface, wherein the first width increases toward the second surface;
A second region extending from the first region toward the second surface, wherein the first width decreases toward the second surface;
A third region extending from the second region toward the second surface, wherein the first width is constant;
The insert for a slot mill according to claim 8, further comprising: a fourth region extending from the third region to the second surface, wherein the fourth region has the first width decreasing toward the second surface. The cutting blade,
A first corner blade having a curved shape protruding outward and located at an end on the side of the first surface;
A first straight blade having a linear shape extending from the first corner blade toward the side of the second surface,
The slot according to claim 8, wherein, when the cutting edge is viewed from the side of the rake face area, the first straight blade is closer to the central axis as being farther from the first corner blade. 11. Insert for mill.   The cutting edge is located at an end on the side of the second surface, and has a second straight corner that is inclined with respect to the first straight blade when viewed from the side of the rake surface region. The slot mill insert according to claim 10, further comprising a blade.   When the first surface is viewed from the front, a straight line connecting two points closest to each other in the rake face regions adjacent to each other among the plurality of rake face regions passes between the through hole and the concave portion. The insert for a slot mill according to any one of claims 1 to 11. A first end face, a second end face opposite to the first end face, an outer peripheral face located between the first end face and the second end face, and an opening with respect to the first end face and the outer peripheral face And a pocket having a screw hole opening toward the first end face;
The insert according to any one of claims 1 to 12, wherein at least a part of the cutting blade is located on the holder and protrudes outward from the outer peripheral surface.
A screw inserted into the through hole and fixed to the screw hole,
The said pocket has a convex part engaged with the said recessed part, The slot mill characterized by the above-mentioned. A first end face, a second end face located opposite to the first end face, an outer peripheral face located between the first end face and the second end face, and an opening with respect to the first end face and the outer peripheral face A holder having a first screw hole and a pocket having a second screw hole that respectively open toward the first end face;
The insert according to any one of claims 1 to 12, wherein at least a part of the cutting blade is located on the holder and protrudes outward from the outer peripheral surface.
A first screw inserted into the through hole and fixed to the first screw hole;
A second screw abutting on the concave portion and being fixed to the second screw hole. The pocket includes a first restraining portion abutting on one of the plurality of rake face regions, and a second restraining portion abutting on another one of the plurality of rake face areas,
The said 1st screw hole is eccentric rather than the said through-hole in the imaginary straight line which connects the said 1st restraint part and the said 2nd restraint part, when the said 1st end surface is front-viewed. 15. The slot mill according to 14.   The slot mill according to claim 15, wherein the first restraining portion and the second restraining portion are respectively separated from the cutting blade.   The front view of the first end surface, wherein the second screw hole is eccentric toward the cutting blade projecting outward from the outer peripheral surface more than the concave portion. A slot mill according to any one of the preceding claims.

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