WO2018198929A1

WO2018198929A1 - Insert for slot mill, and slot mill

Info

Publication number: WO2018198929A1
Application number: PCT/JP2018/016135
Authority: WO
Inventors: 石田　琢也
Original assignee: 京セラ株式会社
Priority date: 2017-04-27
Filing date: 2018-04-19
Publication date: 2018-11-01
Also published as: CN110582365A; JPWO2018198929A1; JP6941163B2

Abstract

An insert for a slot mill according to one aspect has a first surface, a second surface positioned on the side opposite to the first surface, a third surface positioned between the first surface and the second surface, and a through-hole that opens in the first surface and the second surface. The third surface comprises a plurality of rake surface regions, a plurality of flank surface regions positioned between the plurality of rake surface regions, respectively, and a cutting blade positioned on at least part of a ridgeline where the rake surface regions and the flank surface regions intersect. Each of the plurality of flank surface regions has a recessed part.

Description

Slot mill insert and slot mill

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

Rotating tools equipped with cutting inserts (hereinafter referred to as inserts) are used when performing cutting such as grooving on a work material in order to produce a cut product. International Publication No. 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 includes 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. Yes. In the rotary tool described in Patent Document 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 as an insert mounting seat.

In the slot mill described in Patent Document 1, a load is applied to the insert in the direction of rotation around the mounting screw. Therefore, when the slot mill described in Patent Document 1 is used for a long time, the fixing of the insert is unstable due to a load being applied to the mounting screw to loosen the mounting screw or to deteriorate the mounting screw. There is a risk.

In view of the above points, an insert that can be stably fixed to a holder has been demanded.

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

It is a perspective view which shows the insert of 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. FIG. 4 is a cross-sectional view of B1-B1 of the insert shown in FIG. It is a side view from the A2 direction of the insert shown in FIG. FIG. 6 is a cross-sectional view of B2-B2 of the insert shown in FIG. It is a perspective view which shows the rotary tool of 1st Embodiment. FIG. 8 is an enlarged view of a region C1 shown in FIG. 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. It is a front view in the rotary tool shown in FIG. It is an enlarged view of area | 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 which shows the rotary tool of 2nd Embodiment. It is an enlarged view of the area | region C4 shown in FIG. It is a perspective view of the holder in the rotary tool shown in FIG. It is an enlarged view of the area | region C5 shown in FIG. It is a front view in the rotary tool shown in FIG. It is an enlarged view of the area | region C6 shown in FIG. It is the side view which looked at the rotary tool shown in FIG. 14 from A4 direction. It is the schematic which shows 1 process of the manufacturing method of the cut workpiece of embodiment. It is the schematic which shows 1 process of the manufacturing method of the cut workpiece of embodiment. It is the schematic which shows 1 process of the manufacturing method of the cut workpiece of embodiment.

Hereinafter, the slot mill insert (hereinafter also simply referred to as an insert) of the embodiment will be described in detail with reference to the drawings. However, each drawing referred to below shows only the main members necessary for explaining the embodiment in a simplified manner for convenience of explanation. Thus, the insert may comprise any component not shown in the referenced figures. Moreover, the dimension of the member in each figure does not faithfully represent the dimension, dimension ratio, etc. of an actual component member.

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

The first surface 3 is not limited to a specific shape, but in the example shown in FIG. 2, a part of a corner and a side of a polygon having a plurality of corners and sides are cut out. ing. Specifically, as in the example illustrated in FIG. 2, the first surface 3 has one of each of the three corners 2 a and each of the sides constituting the three corners 2 a in the triangle 2 indicated by a two-dot chain line. The shape by which the part was notched may be sufficient. At this time, the three sides may be positioned so as to be 120 ° rotationally symmetric about the central axis O1 in the 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, a configuration cut out in a concave curve shape that is not limited to an arc shape, or a corner 2a by one or a plurality of straight lines. It may be a configuration in which is cut out.

The first surface 3 is not limited to the shape shown in FIG. For example, the first surface 3 is an n-gon (n is an integer greater than 3), and each of n corners and a part of each of the sides constituting the n corners are cut away. 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 be substantially the same shape as the first surface 3. Although not particularly illustrated, the second surface 5 is cut out of each of the three corners 2a and a part of each of the sides constituting the three corners 2a in the triangle 2 in the same manner as the first surface 3. It may be a shape. The second surface 5 does not have to be 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 illustrated in FIG. 1, the third surface 7 may be connected to the first surface 3 and the second surface 5. In the case where 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. Also good.

When the first surface 3 and the second surface 5 are polygonal shapes each having a corner 2a cut away, 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 illustrated in FIG. 1 is a region connected to the sides of the first surface 3 and the second surface 5 of the third surface 7. The curved surface region in the example shown in FIG. 1 is a region connected to a cut-out portion of 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 in the first surface 3 and the second surface 5. Hereinafter, a portion opened in the first surface 3 is referred to as a first opening region 9a, and a portion opened in 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 the holder. For example, as will be described later, the first screw provided in the holder by inserting the first screw from the first opening region 9a of the through hole 9 and projecting the first screw from the second opening region 9b of the through hole 9 is provided. The insert 1 may be fixed to the holder by engaging the hole. The insert 1 can be removed from the holder by removing the first screw.

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 central axis O1 of the insert 1.

The third surface 7 in the example shown in FIG. 1 includes a plurality of rake face regions 11, a plurality of flank face regions 13, and a plurality of cutting edges 15. The rake face region 11 indicates a region through which chips generated by the cutting blade 15 flow during cutting. At this time, chips may or may not contact the rake face region 11. The flank region 13 is a surface that is less in contact with the finished surface during cutting in order to reduce the possibility of causing deterioration of the finished surface due to contact and an increase in frictional heat. Note that in the case of a metal member or the like in which the work material is elastically deformed, the flank region 13 may come into contact with the finished surface during cutting.

The plurality of rake face regions 11 may be located toward the front in the rotational direction from the corresponding cutting edges 15. For example, the plurality of rake face regions 11 may correspond to regions connected to portions of the first surface 3 and the second surface 5 where the corners 2a are notched. The third surface 7 in the example shown in FIG. 2 includes three rake surface regions 11.

In the example shown in FIG. 1, the first surface 3 and the second surface 5 in a front view of the first surface have a configuration in which a portion connected to the rake face region 11 is cut out in a concave curve shape, specifically, Since the structure is cut out in an arc shape, each of the plurality of rake face regions 11 has a curved concave surface.

In addition, when the 1st surface 3 and the 2nd surface 5 are the structures by which the angle | corner was notched by one or several straight lines as above-mentioned, the some rake face area | region 11 is each one or some flat surface. The shape which the surface combined may be sufficient.

However, when each of the plurality of rake face regions 11 has a curved concave curved surface shape, clogging of chips generated in the cutting process is suppressed, and chip dischargeability is high. In particular, when the first surface 3 and the second surface 5 are notched in an arc shape, the chip discharging property is even higher.

The plurality of flank areas 13 on the third surface 7 are located from the corresponding cutting edges 15 toward the rear in the rotational direction. Each flank area 13 is located between the plurality of rake face areas 11. The plurality of flank areas 13 in the embodiment correspond to areas 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 includes three flank region 13. Since the plurality of flank areas 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 plurality of flank areas 13 have a flat surface shape. .

The adjacent rake face area 11 and flank face area 13 intersect to form a ridgeline. The cutting edge 15 is located on at least a part of the ridgeline. In the example shown in FIG. 2, the third surface 7 has three rake face regions 11 and three flank face regions 13, so that there are six ridge lines. And the cutting blade 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 positioned over the entire ridgeline where the adjacent rake face area 11 and the flank face area 13 intersect, the six cutting edges 15 are located on the first face 3 side of the third face 7. In other words, it may be positioned from the end portion to the end portion on the second surface 5 side.

Note that the six cutting edges 15 do not have to be used for cutting at the same time, and any one cutting edge 15 may be used for cutting. And when the cutting edge 15 deteriorates by cutting for a long time, after removing the insert 1 from a holder once, the direction of the insert 1 may be changed and it may attach to a holder again. Thereby, the other unused cutting blade 15 can be used for the cutting of a workpiece.

The portion where the cutting edge 15 is formed on the ridgeline where the rake face area 11 and the flank face area 13 intersect may be subjected to a so-called honing process. That is, the ridge line where the rake face region 11 and the flank face region 13 intersect may not be a strict line shape due to the intersection of two surfaces. Since the strength of the cutting edge 15 may decrease if the ridgeline is linear, for example, the curved edge is formed at the portion where the cutting edge 15 is located on the ridgeline where the rake face area 11 and the flank face area 13 intersect. Honing may be performed.

The plurality of flank areas 13 in the embodiment each have a recess 17. By engaging the concave portion 17 with the convex portion of the holder, even when a force that rotates 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. The insert 1 is locked by the combination. Therefore, the insert 1 is easily fixed stably to the holder.

From the viewpoint of suppressing the rotation of the insert 1 around the first screw, the flank region 13 has a convex portion, and the holder has a concave portion engaged with the convex portion. Good. However, from the viewpoint of reducing the possibility that the flank area 13 contacts the finished surface of the work material, the flank area 13 has the concave portion 17 and the holder has a convex portion as in the embodiment. 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 include a recess and the holder may have a protrusion engaged with the recess. Good. However, from the viewpoint of suppressing clogging of chips in the rake face region 11, a configuration in which the flank face region 13 has the concave portion 17 and the holder has a 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 regions 11 adjacent to each other among the rake face regions 11 are separated from each other as the flank face region 13 located between the rake face regions 11 is separated. You may be located as follows. That is, the rake face regions 11 adjacent to each other may be closest to each other at a place connected to the flank face region 13 located between the rake face regions 11.

Further, when the first surface 3 is viewed from the front, the rake face regions 11 adjacent to each other are located away from the flank face region 13 located between these rake face regions 11 as in the example shown in FIG. May be the closest.

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

The size of the recess 17 is not limited to a specific value. For example, when the flank area 13 is viewed from the front as shown in FIG. 3, the flank area 13 in a direction perpendicular to the central axis O1. The first width W1 of the recess 17 can be set to 0.1L to 0.8L, where L is the width L and the width of the recess 17 in the direction perpendicular to the central axis O1 is the first width W1.

When the first width W1 of the concave portion 17 is 0.1 L or more, the width of the convex portion engaged with the concave portion 17 is easily increased, so that the possibility that the convex portion is broken is reduced, and the durability of the holder is reduced. high. When the first width W1 of the recess 17 is 0.8L or less, the thickness of the insert 1 between the recess 17 in the flank area 13 and the rake face area 11 adjacent to the flank area 13 is as follows. Therefore, the insert 1 has high durability.

In particular, since the flank area 13 is located between the two rake face areas 11, each of the recess 17 in the flank area 13 and the two rake face areas 11 adjacent to the flank area 13 is provided. From the viewpoint of securing the thickness of the insert 1 between them, it is effective that the recess 17 is recessed toward the through hole 9.

Further, although the depth of the recess 17 is not limited to a specific value, for example, the depth D of the recess 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 can be easily increased. Therefore, the insert 1 is rotated around the first screw by the convex portion. High suppression effect. Moreover, when the depth D of the recessed part 17 is 0.5L or less, since the thickness of the insert 1 between the recessed part 17 and the through-hole 9 is easy to ensure, durability of the insert 1 is high.

The shape of the recess 17 is not limited to a specific configuration. As in the example illustrated in FIG. 4, the concave portion 17 may have an arc shape in a cross section orthogonal to the central axis O <b> 1 of the through hole 9. In the cross section shown in FIG. 4, the rake face region 11 is also arc-shaped.

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 recess 17. When the curvature radius of the rake face region 11 is relatively large, clogging of chips is difficult to occur, and chip dischargeability is high. Moreover, when the curvature radius of the recessed part 17 is relatively small, the effect which suppresses rotation of the insert 1 around a 1st screw | thread is high.

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 and the convex portion of the holder are easily engaged, and the attachment of the insert 1 to the holder is facilitated.

Further, when the concave portion 17 extends from the first surface 3 to the second surface 5, a crack is generated in the cutting edge 15 used at the time of cutting, and the crack is along the flank region 13. Even if it progresses, it is easy to stop the progress of cracks in the recess 17.

Therefore, there is little possibility that the above-mentioned cracks will develop to another cutting edge 15 adjacent to the cutting edge 15 where the crack has occurred via the flank region 13 therebetween. As a result, it is easy to avoid that the unused cutting edge 15 becomes unusable due to the above-mentioned crack, and the cost increase due to the replacement of the insert 1 can be 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. It may also be changed. For example, as in the example shown in FIG. 3, the first width W1 of the recess 17 at the end on the first surface 3 side is larger than the first width W1 of the recess 17 at the end on the second surface 5 side. Also good.

When the first width W1 of the concave portion 17 at the end portion on the first surface 3 side is larger than the first width W1 of the concave portion 17 at the end portion on the second surface 5 side, for example, as described later, When the second screw is used in place of the convex portion of the holder as a portion 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 a part engaged with the concave part 17. Therefore, the versatility of the insert 1 is high.

Specifically, the recess 17 in the example shown in FIG. 3 includes 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 sequentially located from the first surface 3 side toward the second surface 5 side 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 the end of the recess 17 on the first surface 3 side, 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 a front view of the flank region 13. In some cases, the distance decreases toward the second surface 5.

When the concave portion 17 includes the first region 17a and the second region 17b, the screw head of the second screw is used when the second screw is used as a portion engaged with the concave portion 17. 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 recess 17 in the example shown in FIG. 3 is the first region 17a and the second region 17b. This is the maximum value at the boundary of the region 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 the front surface of the flank region 13. 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 when the flank region 13 is viewed from the front. It becomes smaller as it goes to 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 likely to come into stable contact. Therefore, the insert 1 is easily fixed stably to the holder. In particular, when the ridge line where the flat surface 13a and the third region 17c intersect in the flank region 13 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, may have a curved shape as a whole, or a portion thereof may have a linear shape and another portion may have a curved shape. For example, the cutting blade 15 may have the 1st corner blade 15a and the 1st linear blade 15b like an example shown in FIG.

In the example shown in FIG. 3, the first corner blade 15a is located at the end of the cutting blade 15 on the first surface 3 side, and has a curved shape protruding outward. Moreover, the 1st linear blade 15b is extended toward the 2nd surface 5 side from the 1st corner blade 15a, and is a linear shape. When the cutting edge 15 has the first corner edge 15a, the durability of the cutting edge 15 is high. Further, when the cutting edge 15 has the first straight edge 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, the first linear blade 15b may be parallel to the central axis O1, and, as an example shown in FIG. You may approach the central axis O1 as it goes away from the 1 corner blade 15a.

When viewed from the side of the rake face region 11, when the first straight blade 15b approaches the central axis O1 as it moves away from the first corner blade 15a, chips are not easily clogged. This is because when the first straight blade 15b is inclined as described above, the chips easily flow not in a direction perpendicular to the central axis O1 but in a direction inclined from this direction toward the first surface 3 side. Because. Thereby, since a chip tends to become spiral shape instead of spiral shape, it is hard to clog.

When the recess 17 has the first region 17a, the second region 17b, the third region 17c, and the fourth region 17d, and the cutting blade 15 has the first corner blade 15a and the first straight blade 15b, the flank region The width of the first region 17a in the direction along the central axis O1 when viewing 13 in front is defined as a second width W2. The width of the first corner blade 15a in the direction along the central axis O1 when the flank area 13 is viewed from the front 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 recess 17 in the example illustrated in FIG. 3 is the maximum value at the boundary between the first region 17a and the second region 17b. Therefore, the flank region 13 on the first surface 3 side of the boundary between the first region 17a and the second region 17b where the first width W1 of the concave portion 17 has the maximum value, that is, the portion where the first region 17a is located. It is effective from the viewpoint of durability of the insert 1 to reduce the cutting load. When the second width W2 is the same as the third width W3, the first corner blade 15a is positioned according to the width of the first region 17a in the direction along the central axis O1, and therefore the durability of the insert 1 Is expensive.

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 2nd corner blade 15c in an example shown in FIG. 3 is located in the edge part by the side of the 2nd surface 5 in the cutting blade 15, and is 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 rake face region 11 side.

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

From the viewpoint of improving the durability of the insert 1, the second corner blade 15c may have a curved shape protruding outward as in the case of 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 is simple while the second corner blade 15c can be manufactured at low cost. Is expensive.

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

As described above, the flank area 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 located between the two adjacent rake face regions 11 and the concave portion 17. You may consider that it has the two flat surfaces 13a each located.

When the flank area 13 has the flat surface 13a, the flank area 13 is less likely to come into contact with the finished surface of the work material.

The flank area 13 may be configured such that the cutting edge 15 is located on each of the ridge lines with the two adjacent rake face areas 11. Here, when the flank region 13 is viewed from the front, when the two flat surfaces 13a are line symmetric with respect to the central axis of the recess 17, any of these two cutting edges 15 may be used. There is little possibility that the flank area 13 contacts the finished surface of the work material.

Examples of the material of the insert 1 include cemented carbide and 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.

Also, cermet is a sintered composite material in which a metal is combined with a ceramic component. Specifically, the cermet includes a titanium compound mainly composed of TiC or TiN (titanium nitride).

The surface of 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 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 in which the insert 1 is attached to the pocket 105 of the holder 103 by the first screw 107. 9 to 10 show the holder 103 from which the insert 1 is removed (not attached). Note that a 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 this embodiment includes an insert 1, a holder 103, and a first screw 107. The rotary tool 101 in this embodiment is a tool used for milling for forming a thin groove.

The holder 103 in the present embodiment has a thin disk shape and has a rotation axis O2 extending in a direction perpendicular to the 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 surface 111 is located on the opposite side of the first end surface 109, and the first end surface 109 and the second end surface 111 are each generally 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 the outer peripheral portion of the disc-shaped holder 103. That is, the rotary tool 101 of the present embodiment is configured to include a holder 103 having a pocket 105 located in the outer peripheral portion and an insert 1 located in the pocket 105. The holder 103 in this embodiment has a plurality of pockets 105. An insert 1 is attached to each pocket 105. That is, the rotary tool 101 of this embodiment has a plurality of inserts 1.

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

The second pocket 105 b is located on the outer peripheral side of the second end surface 111 of the holder 103 and is open to the second end surface 111 and the outer peripheral surface 113. Further, the second pocket 105 b includes a first screw hole 115 b 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. May be.

The insert 1 is located in the first pocket 105a and the second pocket 105b so 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 so that the second surfaces abut each other.

First screw holes

115a and 115b corresponding to the 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 the first screw 107 being inserted into the through hole of the insert 1 and being fixed to the first screw hole 115.

The pocket 105 in this embodiment has a convex part 117 that is engaged with the concave part of the insert 1. Even when a force that rotates around the first screw 107 is applied to the insert 1 during cutting by engaging the convex portion 117 of the pocket 105 with the concave portion of the insert 1, The insert 1 is locked. Therefore, the insert 1 can be stably fixed to the holder 103.

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, the rotary tool 201 according to the second embodiment will be described with reference to FIGS. FIGS. 14 to 15 and FIGS. 18 to 20 show a state in which the insert 1 is attached to the pocket 205 of the holder 203 with the first screw 207. 16 to 17 show the holder 203 from which the insert 1 is removed (not attached). Note that a two-dot chain line in FIG. 14 and the like indicates the rotation axis O2 of the rotary tool 201. Moreover, about the rotary tool 201 of 2nd Embodiment, description is abbreviate | omitted about the part which is the structure similar to the rotary tool 101 of 1st Embodiment.

The rotary tool 201 of this 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 narrow 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 the 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 is constituted by a first pocket 205a and a second pocket 205b, similar to 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 face 209 in addition to the first screw hole 215a. The second pocket 205b also includes a second screw hole 219b that opens toward the second end surface 211 in addition to the first screw hole 215b.

A first screw hole 215 corresponding to the through hole of the insert 1 is formed in each of the first pocket 205a and the second pocket 205b. In the present embodiment, the insert 1 is fixed to the first pocket 205a and the second pocket 205b by the first screw 207 being inserted into the through hole of the insert 1 and being fixed to the first screw hole 215.

Also, second screw holes 219 are formed in the first pocket 205a and the second pocket 205b, respectively. The second screw hole 219 is positioned so as to correspond to the concave portion of the insert 1. A 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 so that the second screw 217 contacts the recess of the insert 1. Even when a force that rotates around the first screw 207 is applied to the insert 1 at the time of cutting by the contact of the second screw 217 with the concave portion of the insert 1, the insert 1 is moved by the second screw 217. Will be locked. Therefore, it becomes possible to stably fix the insert 1 to the holder 203. In other words, the second screw 217 in the present embodiment performs the same function as the convex portion 117 in the first embodiment.

Moreover, in the rotary tool 201 of this embodiment, since the pocket 205 does not have the convex part 117, the attachment work to the pocket 205 of the insert 1 becomes easy compared with the rotary tool 101 of 1st Embodiment.

In the example shown in FIG. 19, the pocket 205 includes a first restraining portion 221 that abuts one of the plurality of rake face regions and a second restraining portion 223 that abuts the other one of the plurality of rake face regions. Yes. Here, when the first end surface 209 is viewed from the front, when the first screw hole is eccentric rather than the through hole toward the virtual straight line connecting the first restricting portion 221 and the second restricting portion 223, the insert 1 is It is pressed toward the first restraining part 221 and the second restraining part 223. Therefore, the binding force to the pocket 205 of the insert 1 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 separated from the cutting blade, respectively, the first restraining portion 221 and It is easy to avoid damage to the cutting blade due to the second restraining portion 223 coming into contact with the cutting blade.

Further, when the first end surface 209 is viewed from the front, when the second screw hole 219 is decentered from the recessed portion toward the cutting edge protruding outward from the outer peripheral surface 213, the insert 1 is moved by the holder 203. It can be stably fixed. This is because a force is applied from the second screw 217 to the recess in the opposite direction to the rotating force around the first screw 207 applied to the cutting edge during the cutting process.

<Manufacturing method of cut product>
Next, a method for manufacturing a machined product will be described with reference to FIGS. 21 to 23 show a method for manufacturing a cut product. 21 to 23 show the rotation axis O2 of the rotary tool 101. The cut workpiece is produced by cutting the work material 301. The cutting method in the embodiment includes the following steps. That is,
(1) rotating the rotary tool 101 typified by the above embodiment;
(2) a step of bringing the insert in the rotating rotary tool 101 into contact with the work material 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 moved closer to the work material 301 while rotating around the rotation axis O2. Next, as shown in FIG. 22, the rotary tool 101 is brought into contact with the work material 301 to cut the work material 301. In the embodiment, the cutting edge of the insert 1 is brought into 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 moved 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. However, the present invention is not limited to such a form.

For example, in the step (1), the work material 301 may be brought close to the rotary tool 101. Similarly, in the step (3), the work material 301 may be moved away from the rotary tool 101. When continuing the cutting process, the state where the rotary tool 101 is rotated may be maintained, and the process of bringing the cutting edge of the insert into contact with a different part of the work material 301 may be repeated. When the cutting blade used is worn, the insert may be rotated 120 ° around the central axis of the through hole and an unused cutting blade may be used. Note that representative examples of the material of the work material 301 include carbon steel, alloy steel, stainless steel, cast iron, and non-ferrous metal.

1 ... Insert (Insert)
DESCRIPTION OF SYMBOLS 3 ... 1st surface 5 ... 2nd surface 7 ... 3rd surface 9 ... Through-hole 9a .. 1st opening area 9b .... 2nd opening area 11 ... Rake face area | region 13. ··· Flank surface region 13a ··· Flat surface 15 ··· Cutting edge 15a ··· First corner blade 15b · · First straight blade 15c · · Second corner blade 17 · · · recessed portion 17a · · · Second region 17c Third region 17d Fourth region 101 Rotary tool 103 Holder 105 Pocket 105a First pocket 105b Second pocket 107 First Screw 109 ... 1st end surface 111 ... 2nd end surface 113 ... Outer peripheral surface 115 ... 1st screw hole 117 ... Convex part 201 ... Rotary tool 203 ... Holder 205 ... Pocket 205a ... First pocket 205b ... Second pocket 207 ... 1st screw 209 ... 1st end surface 211 ... 2nd end surface 213 ... Outer peripheral surface 215 ... 1st screw hole 217 ... 2nd screw 219 ... 2nd screw hole 221 ... 1st restraint part 223 ... 2nd restraint part 301 ... Work material

Claims

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 on at least a part of a plurality of rake face areas, a plurality of flank areas located between the rake face areas, and a ridge line where the rake face area and the flank face area intersect. And a cutting blade that
The slot mill insert, wherein each of the plurality of flank areas has a recess.
The slot mill insert according to claim 1, wherein each of the plurality of rake face regions has a concave curved surface shape.
The rake face region and the recess are each arc-shaped in a cross section perpendicular to the central axis of the through hole, and the radius of curvature of the rake face region is larger than the radius of curvature of the recess. Insert for slot mill.
The slot mill insert according to any one of claims 1 to 3, wherein the flank region has two flat surfaces respectively positioned between the two adjacent rake surface regions and the recess. .
The slot mill insert according to claim 4, wherein the two flat surfaces are axisymmetric with respect to the recess when the flank region is viewed from the front.
The slot mill insert according to any one of claims 1 to 5, wherein the recess is recessed toward the through hole.
The slot mill insert according to any one of claims 1 to 6, wherein the recess extends from the first surface to the second surface.
When the flank area is viewed from the front, when the width of the recess in the direction orthogonal to the central axis of the through hole is the first width,
The slot mill insert according to claim 7, wherein the first width of the concave portion at the end portion on the first surface side is larger than the first width of the concave portion at the end portion on the second surface side. .
When the concave portion is viewed from the front of the flank area,
A first region located at an end of the first surface side, the first width increasing toward the second surface;
A second region extending from the first region toward the second surface and decreasing in the first width toward the second surface;
A third region extending from the second region toward the second surface and having a constant first width;
The slot mill insert according to claim 8, further comprising a fourth region that extends from the third region to the second surface and decreases in the first width toward the second surface.
The cutting blade is
A curved first corner blade located outward at the end of the first surface and projecting outward;
A first linear blade having a linear shape extending from the first corner blade toward the second surface;
The slot according to claim 8 or 9, wherein when the cutting edge is viewed from the side of the rake face region, the first straight edge approaches the central axis as it moves away from the first corner edge. Insert for mill.
The cutting edge is located at an end portion on the second surface side, and is a linear second corner that is inclined with respect to the first straight blade when viewed from the rake face region side. 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 that are closest to each other in the rake face regions adjacent to each other among the rake face regions passes between the through hole and the recess. The slot mill insert according to any one of claims 1 to 11.
A first end face, a second end face located on the opposite side of the first end face, an outer peripheral face located between the first end face and the second end face, and an opening to the first end face and the outer peripheral face. And a holder having a pocket having a screw hole that opens toward the first end surface;
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 slot mill, wherein the pocket has a convex portion engaged with the concave portion.
A first end face, a second end face located on the opposite side of the first end face, an outer peripheral face located between the first end face and the second end face, and an opening to the first end face and the outer peripheral face. And a holder having a pocket having a first screw hole and a second screw hole that respectively open toward the first end surface;
The insert according to any one of claims 1 to 12, wherein at least a part of the cutting edge 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 slot mill comprising: a second screw abutting on the concave portion and fixed to the second screw hole.
The pocket includes a first restraining portion that comes into contact with one of the rake face regions, and a second restraining portion that comes into contact with the other one of the rake face regions.
The first screw hole is more eccentric than a through-hole toward an imaginary straight line connecting the first restraining portion and the second restraining portion when the first end face is viewed from the front. 14. The slot mill according to 14.
The slot mill according to claim 15, wherein each of the first restraining portion and the second restraining portion is separated from the cutting blade.
The second screw hole is more eccentric than the concave portion toward the cutting blade projecting outward than the outer peripheral surface when the first end face is viewed from the front. The slot mill according to any one of 16.