JP7416305B1 - Cutting inserts, bodies and cutting tools - Google Patents

Abstract

The present invention provides a cutting insert, a body, and a cutting tool that can be used by switching a total of four cutting edges, have a reduced thickness, can be easily attached and detached, and have sufficient strength. A cutting insert 30 mounted on an insert mounting seat 600 of a body 20 includes a pair of parallelogram-shaped first end faces 110 and second end faces 120 facing each other, and a first end face 110 and a second end face. Cutting edges 311, 312, 321, 322 formed along the sides that partition 120, and four first side surfaces 211, 212 and second side surfaces provided between the first end surface 110 and the second end surface 120. 221, 222, and a through hole 500 opened at first side surfaces 211, 212 facing each other. It opens at the first side surfaces 211 and 212 without extending over the ridgeline portion R between the side surfaces 221 and 222. [Selection diagram] Figure 3A

Description

The present invention relates to a cutting insert, a body, and a cutting tool.

For example, as a cutting tool for cutting the inner surface of a pipe or the like, there is a known one having a configuration in which a plurality of cutting inserts are arranged circumferentially on the outer circumferential side of a rotating body. Each cutting insert can be removed from the body and replaced. For example, as described in Patent Documents 1 and 2 below, one cutting insert is provided with a plurality of cutting edges, and by changing the attachment state of the cutting insert to the body, the cutting edges used for machining can be changed. There are also known devices that can be switched.

Patent No. 5779830 Japanese Patent Application Publication No. 2012-139814

In the cutting tool of Patent Document 1, for example, in a configuration in which the cutting edge used for machining can be changed by rotating the cutting insert 180 degrees around an axis perpendicular to the rotation center axis of the body, the cutting edge used for machining can be changed. The two cutting edges located at the positions can be switched and used. Furthermore, if the cutting insert is configured to be installed upside down, it is possible to switch between the four cutting edges in total.
However, in such a configuration, the cutting insert may become too thick, making it difficult to perform small diameter machining.

In the cutting tool of Patent Document 2, a through hole into which a screw for fixing the cutting insert to the body is inserted is formed along a diagonal line of the cutting insert having a diamond shape. This cutting insert includes a pair of diamond-shaped rake faces, four flank faces that intersect with the rake faces, and a large portion of the first intersecting ridge line between the adjacent first flank face and second flank face, Since the through hole is opened so as to cut out a large portion of the second intersecting ridgeline between the adjacent third and fourth flanks, the entire length of the remaining first intersecting ridgeline and second intersecting ridgeline is reduced. This may result in a reduction in the wall thickness of the corner portion of the cutting insert, which may lead to a reduction in tool life.

The present invention has been made in view of the above circumstances, and provides a cutting insert that can be used by switching between four cutting edges, has a reduced thickness, can be easily attached and detached, and has sufficient strength. The object is to provide a body to which a cutting insert is attached, and a cutting tool.

In order to achieve the above object, the cutting insert of the present invention has the following features:
A cutting insert mounted on an insert mounting seat of a body,
A pair of end faces of a parallelogram facing each other,
a cutting edge formed along a side that partitions the end surface;
four side surfaces provided between the end surfaces;
a through hole opened at the side surfaces facing each other;
has
The opening of the through hole opens at the side surface without extending over the ridgeline between the adjacent side surfaces.

According to the cutting insert having this configuration, it can be easily attached to the insert mounting seat of the body by inserting a screw into the through hole and screwing it into the screw hole of the body. In addition, by changing the direction and mounting it on the insert mounting seat of the body, one of the plurality of cutting edges can be selected and used.
Moreover, the opening of the through hole for inserting the screw for fixing to the body opens on the side without touching the ridgeline of the adjacent side, so the cutting edge is strengthened by having the opening. The decline can be suppressed. This allows for good cutting with a sufficiently strong cutting edge.

Moreover, the cutting insert of the present invention is
The through hole is formed perpendicularly to the side surface where the opening is formed.

According to the cutting insert with this configuration, the through hole is formed perpendicular to the side surface where the opening is formed, so the fastening force by the screw can be applied in a well-balanced manner, and it is firmly fixed to the body. can.

Moreover, the cutting insert of the present invention is
The side surface or the end surface has a concave portion or a convex portion that engages with a convex portion or a concave portion provided on the body.

According to the cutting insert having this configuration, since the recess or projection engages with the projection or recess of the body, it is possible to suppress the cutting insert from falling off when attached to the body. This improves the workability of fixing to the body.

In order to achieve the above object, the body of the present invention includes:
A body having an insert mounting seat on which a cutting insert is mounted,
The insert mounting seat is
having a plurality of mounting surfaces against which the outer surface of the cutting insert is abutted;
Screw holes for screwing the cutting insert are formed in the plurality of mounting surfaces.

According to the body with this configuration, screw holes are formed on the plurality of mounting surfaces that make up the insert mounting seat, so select one of the screw holes on these mounting surfaces and insert a screw for fixing the cutting insert. It can be fixed by screwing it in. Thereby, for example, the cutting insert can be fixed to the body while changing its orientation.

Further, the body of the present invention has
At least one of the plurality of attachment surfaces has a convex portion or a concave portion that engages with a concave portion or a convex portion provided on the cutting insert.

According to the body having this configuration, by engaging the recess or projection of the cutting insert with the projection or recess of the body, it is possible to suppress the cutting insert from falling off when the cutting insert is attached to the body. Thereby, the workability of fixing the cutting insert to the body can be improved.

In order to achieve the above object, the cutting tool of the present invention includes:
A cutting tool comprising a cutting insert and a body having an insert mounting seat on which the cutting insert is mounted,
The cutting insert is
A pair of end faces of a parallelogram facing each other,
a cutting edge formed along a side that partitions the end surface;
four side surfaces provided between the end surfaces;
a through hole opened at the side surfaces facing each other;
has
The insert mounting seat of the body is
Each mounting surface that the side surface of the cutting insert abuts has a screw hole into which a screw passed through the through hole can be screwed.

According to the cutting tool having this configuration, the cutting insert can be easily attached to the insert mounting seat of the body by inserting a screw into the through hole of the cutting insert and screwing it into the screw hole of the body. Further, by changing the direction of the cutting insert and mounting it on the insert mounting seat of the body, it is possible to select and use any one of the plurality of cutting edges.
Moreover, screw holes are formed on the multiple mounting surfaces that make up the insert mounting seat of the body, so select one of the screw holes on these mounting surfaces and screw in the screw to secure the cutting insert. can. Thereby, for example, the cutting insert can be fixed to the body while changing its orientation.

Furthermore, the cutting tool of the present invention includes:
The opening of the through hole of the cutting insert opens at the side surface without extending over the ridgeline between the adjacent side surfaces.

According to the cutting tool with this configuration, the opening of the through hole for inserting the screw for fixing the cutting insert to the body can be formed on the side surface without touching the ridge line between the adjacent side surfaces of the cutting insert. Since it is open, it is possible to suppress a decrease in the strength of the cutting edge due to the presence of the opening. This allows for good cutting with a sufficiently strong cutting edge.

Furthermore, the cutting tool of the present invention includes:
The through hole of the cutting insert is formed perpendicularly to the side surface on which the opening is formed.

According to the cutting tool with this configuration, since the through hole of the cutting insert is formed perpendicular to the side surface where the opening is formed, the fastening force by the screw can be applied in a well-balanced manner, and the fastening force can be applied to the body. The cutting insert can be firmly fixed.

Furthermore, the cutting tool of the present invention includes:
The side surface or the end surface of the cutting insert has a concave portion or a convex portion,
At least one of the plurality of attachment surfaces of the body has a convex portion or a concave portion that engages with the concave portion or the convex portion of the cutting insert.

According to the cutting tool having this configuration, by engaging the recess or projection of the cutting insert with the projection or recess of the body, it is possible to suppress the cutting insert from falling off when the cutting insert is attached to the body. Thereby, the workability of fixing the cutting insert to the body can be improved.

According to the present invention, a cutting insert that can be used by switching a total of four cutting edges, has a reduced thickness, can be easily attached and detached, and has sufficient strength, a body to which the insert is attached, and a cutting insert that can be used by switching between four cutting edges. We can provide tools.

FIG. 1 is a perspective view of a cutting tool equipped with a cutting insert according to this embodiment. FIG. 2 is a front view of a cutting tool equipped with a cutting insert according to this embodiment. FIG. 3A is a diagram showing the configuration of the cutting insert according to the present embodiment, and is a diagram viewed from a direction perpendicular to the first end surface in FIG. 4. FIG. 3B is a diagram of the cutting insert of FIG. 3A viewed from a direction perpendicular to the second end surface in FIG. 6. FIG. FIG. 4 is a diagram showing the configuration of the cutting insert according to the present embodiment, and is a perspective view of the cutting insert seen from the first side. FIG. 5 is a diagram showing the configuration of the cutting insert according to the present embodiment, as viewed from a direction perpendicular to the first side surface in FIG. 4. FIG. 6 is a diagram showing the configuration of the cutting insert according to the present embodiment, and is a perspective view of the cutting insert seen from the second side surface side. FIG. 7 is a diagram showing the configuration of the cutting insert according to the present embodiment, as viewed from a direction perpendicular to the second side surface in FIG. 6. FIG. 8 is a perspective view of the insert mounting seat portion of the body to which the cutting insert according to the present embodiment is mounted. FIG. 9 is a perspective view of the insert mounting seat portion of the body for explaining how to attach the cutting insert to the insert mounting seat of the body. FIG. 10 is a cross-sectional view along the rotation center axis of the insert mounting seat portion of the body into which the cutting insert is fitted. FIG. 11 is a perspective view of the insert mounting seat portion of the body, illustrating how to attach the cutting insert to the insert mounting seat of the body. FIG. 12 is a cross-sectional view along the rotation center axis of the insert mounting seat portion of the body into which the cutting insert is fitted. FIG. 13 is a perspective view of a cutting tool with a cutting insert attached to the body. FIG. 14 is a front view of a cutting tool with a cutting insert attached to the body.

This embodiment will be described below with reference to the accompanying drawings. In order to facilitate understanding of the description, the same components in each drawing are denoted by the same reference numerals as much as possible, and redundant description will be omitted.

This embodiment will be described. The cutting tool 10 according to the present embodiment is a milling tool for cutting the inner surface of a pipe or the like while rotating, and is also referred to as a "pull counter boring tool." Note that the configuration of the cutting tool 10 described below is also applicable to other milling tools.

FIG. 1 is a perspective view showing the appearance of a cutting tool 10. FIG. FIG. 2 is a front view of the cutting tool 10 of FIG. 1, viewed from the tip side along the rotation center axis AX1. As shown in FIGS. 1 and 2, the cutting tool 10 includes a plurality of cutting inserts 30, which are attached to a body 20.

The body 20 is the main body portion of the cutting tool 10, and is held by a machine tool (not shown) together with the holder, for example, in a state where it is attached to a holder such as an arbor. The body 20 has a substantially cylindrical shape, and its center axis coincides with the rotation center axis AX1. During machining, the body 20 rotates around the rotation center axis AX1 due to the driving force of the machine tool. In FIGS. 1 and 2, the direction of rotation is indicated by an arrow.

The cutting insert 30 is a member in which a first cutting edge 311 and the like for cutting a workpiece are formed. As described above, a plurality of cutting inserts 30 are provided, and are arranged at equal intervals in the circumferential direction on the outer peripheral side of the body 20. The shapes of the respective cutting inserts 30 are the same. The cutting insert 30 is attached to the body 20 by a screw 50.

The configuration of the cutting insert 30 will be described with reference to FIGS. 3 to 7. The cutting insert 30 has a first end surface 110 and a second end surface 120. The first end surface 110 is the surface on the front side of the paper in FIG. 3A, and the second end surface 120 is the surface on the back side of the paper in FIG. 3A (the front side of the paper in FIG. 3B). That is, the first end surface 110 and the second end surface 120 are parallel surfaces facing each other. The first end surface 110 and the second end surface 120 are surfaces that partially function as "rake surfaces" during processing.

As will be explained later, the attachment state of the cutting insert 30 to the body 20 is not limited to that shown in FIG. 1. For example, the cutting insert 30 can be attached to the body 20 with the second end surface 120 facing forward in the rotational direction instead of the first end surface 110.

The first end surface 110 is a generally parallelogram-shaped surface and is defined by four sides 111, 112, 113, and 114. Among these, sides 111 and 113 are a pair of parallel sides, and sides 112 and 114 are also a pair of parallel sides.

Like the first end surface 110, the second end surface 120 is also a generally parallelogram-shaped surface and is partitioned by four sides 121, 122, 123, and 124. Among these, sides 121 and 123 are a pair of parallel sides, and sides 122 and 124 are also a pair of parallel sides.

A total of four cutting edges (two first cutting edges 311, 312 and two second cutting edges 321, 322) are formed in the cutting insert 30.

Of the total four cutting edges formed on the cutting insert 30, the two first cutting edges 311 and 312 are both provided along the sides that partition the first end surface 110. Specifically, the first cutting edge 311 is provided along the side 111 at the same position as the side 111, and the first cutting edge 312 is provided along the side 113 at the same position as the side 113. . The first cutting edges 311 and 312 are parallel to each other.

Similarly, among the total of four cutting edges formed on the cutting insert 30, the two second cutting edges 321 and 322 are both provided along the sides that partition the second end surface 120. Specifically, the second cutting edge 321 is provided along the side 121 at the same position as the side 121, and the second cutting edge 322 is provided along the side 123 at the same position as the side 123. . The second cutting edges 321 and 322 are parallel to each other.

Note that among the plurality of cutting edges that the cutting insert 30 has, only one actually functions as a "cutting edge" during processing. Which of the first cutting edges 311, 312 and the second cutting edges 321, 322 functions as a "cutting edge" changes depending on the attachment state of the cutting insert 30 to the body 20. For example, in the attached state shown in FIG. 1, only the first cutting edge 311 closest to the tip actually functions as a "cutting edge".

The cutting insert 30 is provided with a total of four margins (two first margins 411, 412, two second margins 421, 422). The "margin" is provided for the purpose of ensuring the straightness of the cutting tool 10, improving the circularity of the hole, etc. In this embodiment, the "margin" is provided as a flat surface that is inclined with respect to the adjacent surface. It is being

Of the four margins, two first margins 411 and 412 are both provided along the sides that partition the first end surface 110. Specifically, the first margin 411 is provided along the side 112, and the first margin 412 is provided along the side 114. The first margins 411, 412 are parallel to each other. Of the four margins, two second margins 421 and 422 are both provided along the sides that partition the second end surface 120. Specifically, the second margin 421 is provided along the side 122, and the second margin 422 is provided along the side 124. The second margins 421, 422 are parallel to each other.

Among the plurality of margins that the cutting insert 30 has, only one actually functions as a "margin" during processing. Which of the first margins 411, 412 and the second margins 421, 422 functions as a "margin" changes depending on the attachment state of the cutting insert 30 to the body 20. For example, in the attached state shown in FIG. 1, only the first margin 411 located on the outermost side actually functions as a "margin".

As described above, in the cutting insert 30, the pair of first cutting edges 311, 312 parallel to each other and the pair of first margins 411, 412 parallel to each other are both provided on the outer peripheral side of the first end surface 110. As a result, the shape of the first end surface 110 is approximately a parallelogram. Similarly, in the cutting insert 30, a pair of second cutting edges 321, 322 parallel to each other and a pair of second margins 421, 422 parallel to each other are both provided on the outer peripheral side of the second end surface 120. As a result, the shape of the second end surface 120 is approximately a parallelogram.

The cutting insert 30 is provided with four side surfaces (a pair of first side surfaces 211 and 212 and a pair of second side surfaces 221 and 222) between the first end surface 110 and the second end surface 120. The first side surfaces 211, 212 and the second side surfaces 221, 222 are surfaces that partially function as "relief surfaces" during processing.

The first side surface 211 extends from the first cutting edge 311 toward the second end surface 120 on the back side in FIG. 3A. The aforementioned second margin 421 is interposed between the first side surface 211 and the second end surface 120. That is, the first side surface 211 extends from the first cutting edge 311 toward the second margin 421 and is connected to the second end surface 120 via the second margin 421.

The first side surface 212 extends from the first cutting edge 312 toward the second end surface 120 on the back side in FIG. 3A. The aforementioned second margin 422 is interposed between the first side surface 212 and the second end surface 120. That is, the first side surface 212 extends from the first cutting edge 312 toward the second margin 422 and is connected to the second end surface 120 via the second margin 422.

The second side surface 221 extends from the second cutting edge 321 toward the first end surface 110 on the back side in FIG. 3B. The aforementioned first margin 411 is interposed between the second side surface 221 and the first end surface 110. That is, the second side surface 221 extends from the second cutting edge 321 toward the first margin 411 and is connected to the first end surface 110 via the first margin 411.

The second side surface 222 extends from the second cutting edge 322 toward the first end surface 110 on the back side of FIG. 3B. The aforementioned first margin 412 is interposed between the second side surface 222 and the first end surface 110. That is, the second side surface 222 extends from the second cutting edge 322 toward the first margin 412 and is connected to the first end surface 110 via the first margin 412.

As described above, the cutting insert 30 according to the present embodiment has a pair of first side surfaces 211, 212 extending from the first cutting edges 311, 312 toward the second margins 421, 422, and a second cutting edge 321, 322. A pair of second side surfaces 221, 222 extending from the side toward the first margins 411, 412.

Among the plurality of side surfaces (first side surface 211, etc.) that the cutting insert 30 has, only one part actually functions as a "flank surface" during processing. Which of the first side surfaces 211, 212 and the second side surfaces 221, 222 functions as a "flank surface" changes depending on the attachment state of the cutting insert 30 to the body 20. For example, in the attached state shown in FIG. 1, only the first side surface 211 adjacent to the first cutting edge 311 actually functions as a "relief surface."

Similarly, of the two end surfaces (first end surface 110, second end surface 120) that the cutting insert 30 has, only one actually partially functions as a "rake surface" during processing. Which of the first end surface 110 and the second end surface 120 functions as the "rake surface" changes depending on the attachment state of the cutting insert 30 to the body 20. For example, in the attached state shown in FIG. 1, the first end surface 110 adjacent to the first cutting edge 311 actually functions as a "rake surface."

In this embodiment, the lengths of the first cutting edges 311 and 312 are the same, and the lengths of the second cutting edges 321 and 322 are also the same. Furthermore, the lengths of the first cutting edges 311 and 312 and the lengths of the second cutting edges 321 and 322 are also the same. In other words, the lengths of the four cutting edges formed in the cutting insert 30 are all the same length. As a result, the outer shape of the cutting insert 30 when viewed as shown in FIGS. 3A and 3B is approximately rhombic.

The axis AX2 shown in FIGS. 3A and 3B is an axis perpendicular to the first end surface 110. When the cutting insert 30 is viewed from a direction perpendicular to the first end surface 110 as shown in FIGS. 3A and 3B, the axis AX2 passes through the geometric center of the entire outer shape of the cutting insert 30.

When the cutting insert 30 is rotated 180 degrees around the axis AX2, the entire shape of the cutting insert 30 after rotation overlaps with the shape of the cutting insert 30 before rotation. The axis AX2 exists because the shape of the cutting insert 30 has the symmetry described above. The axis AX2 corresponds to the "first axis of symmetry" in this embodiment. For example, when the cutting insert 30 is rotated 180 degrees around the axis AX2 and attached to the body 20 from the state shown in FIG. 1, the first cutting edge 312 functions as an actual "cutting edge". Become.

The axis AX3 shown in FIGS. 3A and 3B is an axis parallel to the first end surface 110 and passes through an intermediate position between the first end surface 110 and the second end surface 120. When the cutting insert 30 is rotated 180 degrees around the axis AX3, the outer shape of the cutting insert 30 after rotation overlaps with the outer shape of the cutting insert 30 before rotation. Note that the through holes 500 do not overlap before and after rotation, but change direction. Such an axis AX3 also exists because the shape of the cutting insert 30 has the symmetry as described above. The axis AX3 corresponds to the "second axis of symmetry" in this embodiment. For example, if the cutting insert 30 is rotated 180 degrees around the axis AX3 and attached to the body 20 from the state shown in FIG. It will function as a "blade". At this time, the screw 50 is screwed into the second screw hole 612, and the direction of the screw 50 is different from the state shown in FIG. 1 in which the screw 50 is screwed into the first screw hole 611.

The axis AX4 shown in FIGS. 3A and 3B is an axis parallel to the first end surface 110 and passes through an intermediate position between the first end surface 110 and the second end surface 120. The axis AX4 is an axis similar to the axis AX3, but is oriented in a different direction from the axis AX3. Specifically, axis AX4 is an axis perpendicular to axis AX3. When the cutting insert 30 is rotated 180 degrees around the axis AX4, the outer shape of the cutting insert 30 after rotation overlaps with the outer shape of the cutting insert 30 before rotation. Note that the through holes 500 do not overlap before and after rotation, but change direction. Such an axis AX4 also exists because the shape of the cutting insert 30 has the symmetry as described above. The axis AX4 corresponds to the "third axis of symmetry" in this embodiment. For example, if the cutting insert 30 is rotated 180 degrees around the axis AX4 and attached to the body 20 from the state shown in FIG. 1, the second cutting edge 322 will function as an actual "cutting edge". Become. At this time as well, the screw 50 is screwed into the second screw hole 612, and the direction of the screw 50 is different from the state shown in FIG. 1 in which the screw 50 is screwed into the first screw hole 611.

In this embodiment, first screw holes in two different directions are provided on mutually different surfaces, a first mounting surface 601 and a second mounting surface 602, among the surfaces forming an insert mounting seat 600 of the body 20, which will be described later. 611, since the second screw hole 612 is formed, the cutting insert 30 can be attached to the body 20 in various orientations while rotating around each of the axes AX2, AX3, and AX4, This makes it possible to select and switch the "cutting edge" used for cutting from among the first cutting edges 311, 312 and the second cutting edges 321, 322. Such switching of the cutting edge can be performed on a single body 20 in which the first screw hole 611 and the second screw hole 612 are formed in two directions, without separately preparing a reverse-handled body 20. Therefore, the cost required for cutting can be reduced.

The cutting insert 30 has a through hole 500. This through hole 500 is formed from the first side surface 211 to the first side surface 212. The openings 501 and 502 of the through hole 500 are open at the first side surfaces 211 and 212. Further, one opening 501 opened at the first side surface 211 opens without touching the ridgeline R between the first side surface 211 and the second side surfaces 221 and 222, and the other opening section 501 opened at the first side surface 212 opens. The opening 502 is open without extending over the ridgeline portion R between the first side surface 212 and the second side surfaces 221 and 222. The through hole 500 is formed perpendicularly to the first side surfaces 211 and 212 on which the openings 501 and 502 are formed. Further, the through hole 500 has diameter reducing portions 501a, 502a on the opening portions 501, 502 side, the diameter of which gradually decreases toward the middle portion.
In order to increase the number of usable corners of the cutting insert 30, it is easier to use a configuration in which the holes are symmetrically penetrated, as in Patent Document 2, for example, but the present inventor has developed a method for reducing the number of used cutting inserts with such a configuration. Based on the damage state, it has been found that cutting inserts are often damaged from the corner portions, and based on this knowledge, the cutting insert 30 has a configuration in which the through hole 500 does not penetrate through the ridge line portion R corresponding to the corner portion. There is. As described above, in this embodiment, by increasing the thickness of the corner portion of the cutting insert 30, it is possible to prevent breakage and significantly improve tool life.

This through hole 500 is a hole through which the screw 50 is inserted when fixing the cutting insert 30 to the body 20, and the screw 50 is inserted through either one of the openings 501 and 502. The head 50a of the screw 50 inserted into the through hole 500 engages with either the reduced diameter portion 501a or 502a. That is, when the screw 50 is inserted through the opening 501, the head 50a of the screw 50 engages with the reduced diameter portion 501a on the opening 501 side, and when the screw 50 is inserted through the opening 502, The head 50a of the screw 50 engages with the reduced diameter portion 502a on the opening 502 side.

In addition, the cutting insert 30 has recesses 511 and 512 that can be engaged with the convex portion 621 of the first mounting surface 601 in order to prevent the cutting insert 30 from falling off due to gravity when it is fixed to the body 20, which will be described later, and to improve the fixing workability. , 521, 522. Specifically, first, first side surfaces 211 and 212 have recesses 511 and 512. The recess 511 of the first side surface 211 is located closer to the second side surface 222, which is located lower than the first screw hole 611 in the insert falling direction when the insert is fixed (lower in the right-down inclined direction of the first mounting surface 601 in FIG. 8). The recessed portion 512 of the first side surface 212 is formed closer to the second side surface 221 which is located lower than the first screw hole 611 in the falling direction when the insert is attached. Similarly, the cutting insert 30 has recesses 521 and 522 on the second side surfaces 221 and 222. The recess 521 of the second side 221 is formed closer to the first side 212 than the first screw hole 611, which is located lower in the insert removal direction when installing the insert, and the recess 522 of the second side 222 is formed closer to the first screw hole 611. The insert is also formed near the first side surface 211, which is located downward in the direction in which the insert falls off when the insert is attached.

The body 20 has a plurality of insert mounting seats 600 on the outer peripheral side at the tip thereof. These insert mounting seats 600 are formed so as to be lined up at equal intervals in the circumferential direction. The cutting insert 30 is mounted on each insert mounting seat 600 of the body 20 (see FIG. 1).

FIG. 8 is a perspective view of the insert mounting seat 600 of the body 20 to which the cutting insert 30 according to the present embodiment is mounted.
As shown in FIG. 8, the insert mounting seat 600 of the body 20 has a first mounting surface 601, a second mounting surface 602, and a third mounting surface 603. The first mounting surface 601 is a plane that gradually slopes outward in the radial direction toward the rear end of the body 20 with respect to the rotation center axis AX1 of the body 20. The second mounting surface 602 is a plane along the rotation center axis AX1 of the body 20. The third mounting surface 603 is a plane perpendicular to the rotation center axis AX1 of the body 20 in the radial direction.

A first screw hole 611 is formed in the first mounting surface 601 . This first screw hole 611 is formed perpendicularly to the first mounting surface 601. The screw 50 inserted into the through hole 500 of the cutting insert 30 is screwed into the first screw hole 611 . A second screw hole 612 is formed in the second mounting surface 602. This second screw hole 612 is formed perpendicularly to the second mounting surface 602. The screw 50 inserted into the through hole 500 of the cutting insert 30 is screwed into the second screw hole 612 .

The cutting insert 30 is attached to the insert mounting seat 600 with the body 20 oriented such that the rotation center axis AX1 is parallel to the vertical direction. If the body 20 is oriented in this way, the first mounting surface 601 will be inclined to the lower right as shown in FIG. The insert 30 slides along the first mounting surface 601 and falls off. Therefore, a convex portion 621 is provided on the first mounting surface 601 on the radially outer side of the body 20 than the first screw hole 611 . This convex portion 621 is made up of the end of a pin 622 fixed to the first mounting surface 601, and this pin 622 is screwed into a screw hole 623 formed in the first mounting surface 601 and fixed. . This convex portion 621 is formed in the recesses 511, 512 formed closer to the second side surfaces 222, 221 of the first side surfaces 211, 212 of the cutting insert 30 mentioned above, or in the recesses 511, 512 formed closer to the first side surfaces 212, 211 of the second side surfaces 221, 222. It is possible to engage with the formed recesses 521 and 522. The convex portion 621 engages with the recesses 511 and 512 on the first side surfaces 211 and 212 or the recesses 521 and 522 on the second side surfaces 221 and 222 when the cutting insert 30 is mounted on the insert mounting seat 600. Therefore, when the cutting insert 30 is mounted on the insert mounting seat 600, the cutting insert 30 is prevented from falling off, and smooth mounting on the insert mounting seat 600 is possible.

Next, attachment of the cutting insert 30 to the body 20 will be explained.
FIG. 9 is a perspective view of the insert mounting seat 600 of the body 20 for explaining how to attach the cutting insert 30 to the insert mounting seat 600 of the body 20. FIG. 10 is a cross-sectional view of the insert mounting seat 600 of the body 20 into which the cutting insert 30 is fitted, taken along the rotation center axis AX1. FIG. 11 is a perspective view of the insert mounting seat 600 of the body 20 for explaining how to attach the cutting insert 30 to the insert mounting seat 600 of the body 20. FIG. 12 is a cross-sectional view of the insert mounting seat 600 of the body 20 into which the cutting insert 30 is fitted, taken along the rotation center axis AX1. FIG. 13 is a perspective view of the cutting tool 10 in which the cutting insert 30 is attached to the body 20. FIG. 14 is a front view of the cutting tool 20 in which the cutting insert 30 is attached to the body 20.

(When using the first cutting edge 311)
When using the first cutting edge 311 of the cutting insert 30 as a cutting edge, as shown in FIG. 9 and FIG. The side surface 222 faces the second mounting surface 602, and the second end surface 120 faces the third mounting surface 603. In this state, the cutting insert 30 is fitted into the insert mounting seat 600. As a result, the cutting insert 30 has the first side surface 212 in contact with the first mounting surface 601, the second side surface 222 in contact with the second mounting surface 602, and the second end surface 120 in contact with the third mounting surface 603. be touched.

In this manner, when the cutting insert 30 is fitted into the insert mounting seat 600, the convex portion 621 of the first mounting surface 601 engages with the recessed portion 512 of the first side surface 212. As a result, the cutting insert 30 is held on the insert mounting seat 600, and the cutting insert 30 is prevented from falling off. Further, in this state, the through hole 500 of the cutting insert 30 communicates with the first screw hole 611 formed in the first mounting surface 601 of the insert mounting seat 600.

In this state, the screw 50 is inserted into the opening 501 of the through hole 500 of the cutting insert 30 and screwed into the first screw hole 611 of the first mounting surface 601 of the insert mounting seat 600. As a result, the cutting insert 30 is mounted on the insert mounting seat 600 of the body 20 with the first cutting edge 311 being used as a cutting edge (see FIGS. 1 and 2).

(When using the first cutting edge 312)
When using the first cutting edge 312 of the cutting insert 30 as a cutting edge, the first side surface 211 is opposed to the first mounting surface 601 and the second side surface 221 is opposed to the second mounting surface 602 with respect to the insert mounting seat 600. so that the second end surface 120 faces the third mounting surface 603. In this state, the cutting insert 30 is fitted into the insert mounting seat 600. As a result, the cutting insert 30 has the first side surface 211 in contact with the first mounting surface 601, the second side surface 221 in contact with the second mounting surface 602, and the second end surface 120 in contact with the third mounting surface 603. be touched.

In this manner, when the cutting insert 30 is fitted into the insert mounting seat 600, the convex portion 621 of the first mounting surface 601 engages with the recess 511 of the first side surface 211. As a result, the cutting insert 30 is held on the insert mounting seat 600, and the cutting insert 30 is prevented from falling off. Further, in this state, the through hole 500 of the cutting insert 30 communicates with the first screw hole 611 formed in the first mounting surface 601 of the insert mounting seat 600.

In this state, the screw 50 is inserted into the opening 502 of the through hole 500 of the cutting insert 30 and screwed into the first screw hole 611 of the first mounting surface 601 of the insert mounting seat 600. As a result, the cutting insert 30 is mounted on the insert mounting seat 600 of the body 20 with the first cutting edge 312 being used as a cutting edge.

(When using the second cutting edge 321)
When using the second cutting edge 321 of the cutting insert 30 as a cutting edge, as shown in FIGS. The side surface 212 faces the second mounting surface 602, and the first end surface 110 faces the third mounting surface 603. In this state, the cutting insert 30 is fitted into the insert mounting seat 600. As a result, the cutting insert 30 has the second side surface 222 in contact with the first mounting surface 601, the first side surface 212 in contact with the second mounting surface 602, and the first end surface 110 in contact with the third mounting surface 603. be touched.

In this manner, when the cutting insert 30 is fitted into the insert mounting seat 600, the convex portion 621 of the first mounting surface 601 engages with the recess 522 of the second side surface 222. As a result, the cutting insert 30 is held on the insert mounting seat 600, and the cutting insert 30 is prevented from falling off. Further, in this state, the through hole 500 of the cutting insert 30 communicates with the second screw hole 612 formed in the second mounting surface 602 of the insert mounting seat 600.

In this state, the screw 50 is inserted into the opening 501 of the through hole 500 of the cutting insert 30 and screwed into the second screw hole 612 of the second mounting surface 602 of the insert mounting seat 600. Thereby, as shown in FIG. 14, the cutting insert 30 is mounted on the insert mounting seat 600 of the body 20 with the second cutting edge 321 being used as a cutting edge.

(When using the second cutting edge 322)
When using the second cutting edge 322 of the cutting insert 30 as a cutting edge, with respect to the insert mounting seat 600, the second side surface 221 is opposed to the first mounting surface 601, and the first side surface 211 is opposed to the second mounting surface 602. so that the first end surface 110 faces the third mounting surface 603. In this state, the cutting insert 30 is fitted into the insert mounting seat 600. As a result, the cutting insert 30 has the second side surface 221 in contact with the first mounting surface 601, the first side surface 211 in contact with the second mounting surface 602, and the first end surface 110 in contact with the third mounting surface 603. be touched.

In this manner, when the cutting insert 30 is fitted into the insert mounting seat 600, the convex portion 621 of the first mounting surface 601 engages with the recess 521 of the second side surface 221. As a result, the cutting insert 30 is held on the insert mounting seat 600, and the cutting insert 30 is prevented from falling off. Further, in this state, the through hole 500 of the cutting insert 30 communicates with the second screw hole 612 formed in the second mounting surface 602 of the insert mounting seat 600.

In this state, the screw 50 is inserted into the opening 502 of the through hole 500 of the cutting insert 30 and screwed into the second screw hole 612 of the second mounting surface 602 of the insert mounting seat 600. As a result, the cutting insert 30 is mounted on the insert mounting seat 600 of the body 20 with the second cutting edge 322 being used as a cutting edge.

As described above, according to the present embodiment, the screw 50 is inserted into the through hole 500 of the cutting insert 30 and screwed into the first screw hole 611 or the second screw hole 612 of the body 20. The cutting insert 30 can be easily mounted on the insert mounting seat 600. Further, by changing the orientation of the cutting insert 30 and mounting it on the insert mounting seat 600 of the body 20, one of the plurality of cutting edges can be selected and used.

Moreover, since the first screw hole 611 and the second screw hole 612 are formed in the first mounting surface 601 and the second mounting surface 602 that constitute the insert mounting seat 600 of the body 20, the first mounting surface 601 and the second screw hole 612 are formed. Either the first screw hole 611 or the second screw hole 612 of the second mounting surface 602 can be selected and the screw 50 for fixing the cutting insert 30 can be screwed and fixed. Thereby, for example, the cutting insert 30 can be fixed to the body 20 while changing its orientation.

Further, the openings 501 and 502 of the through hole 500 for inserting the screw 50 for fixing the cutting insert 30 to the body 20 are located on the second side surfaces 221 and 222 of the cutting insert 30 adjacent to the first side surfaces 211 and 212. Since the openings are opened in the first side surfaces 211 and 212 without touching the ridgeline R of the cutting insert 30, a reduction in strength of the cutting edge due to a reduction in wall thickness at the corner portion of the cutting insert 30 due to the openings 501 and 502 can be suppressed. I can do it. This allows for good cutting with a sufficiently strong cutting edge.

Further, since the through hole 500 of the cutting insert 30 is formed perpendicularly to the first side surfaces 211 and 212 in which the openings 501 and 502 are formed, the fastening force by the screw 50 can be applied in a well-balanced manner. , the cutting insert 30 can be firmly fixed to the body 20.

Further, the cutting insert 30 has recesses 511, 512, 521, 522 on the first side surfaces 211, 212 and the second side surfaces 221, 222, and the body 20 is placed in any of these recesses 511, 512, 521, 522. A convex portion 621 provided on the first mounting surface 601 of the insert mounting seat 600 is engaged. Therefore, when the cutting insert 30 is attached to the body 20, falling off of the cutting insert 30 from the body 20 due to gravity can be suppressed. Thereby, the workability of fixing the cutting insert 30 to the body 20 can be improved.

Note that the convex portions that engage with the concave portions 511, 512, 521, and 522 of the cutting insert 30 may be provided on the second mounting surface 602 of the holder 20. Alternatively, a recess may be provided on the first end surface 110 and the second end surface 120 of the cutting insert 30, and a protrusion may be provided on the third mounting surface 603 for engagement.

Further, in the above embodiment, the cutting insert 30 is provided with the recesses 511, 512, 521, and 522 with which the projection 621 of the holder 20 engages. A recess may be provided in the holder 20.

10 Cutting tool 20 Body 30 Cutting insert 50 Screw 110 First end surface (end surface)
111, 112, 113, 114 Side 120 Second end surface (end surface)
121, 122, 123, 124 Side 211, 212 First side (side)
221, 222 Second side (side)
311,312 1st cutting edge (cutting edge)
321,322 Second cutting edge (cutting edge)
500 Through holes 501, 502 Openings 511, 512, 521, 522 Recess 600 Insert mounting seat 601 First mounting surface (mounting surface)
602 Second mounting surface (mounting surface)
603 Third mounting surface (mounting surface)
611 1st screw hole (screw hole)
612 2nd screw hole (screw hole)
621 Convex R ridgeline part

Claims (6)

Among the plurality of mounting surfaces constituting the insert mounting seat of the body, the mounting surfaces intersect with the outer circumferential surface of the body and gradually move outward in the radial direction from the front end side to the rear end side of the body with respect to the rotation center axis of the body. A cutting insert mounted on the insert mounting seat in contact with an inclined first mounting surface,
A pair of end faces of a parallelogram facing each other,
a cutting edge formed along a side that partitions the end surface;
four side surfaces provided between the end surfaces;
a through hole opened at the side surfaces facing each other;
has
The opening of the through hole opens at the side surface without extending over a ridgeline between the adjacent side surfaces,
The side surface includes a convex portion provided on the first mounting surface or a concave portion or a convex portion that suppresses the cutting insert from falling off along the first mounting surface by engaging with the concave portion;
cutting insert. The through hole is formed perpendicularly to the side surface on which the opening is formed.
The cutting insert according to claim 1. A body having an insert mounting seat on which a cutting insert is mounted,
The insert mounting seat is
having a plurality of mounting surfaces against which the outer surface of the cutting insert is abutted;
Screw holes for screwing the cutting insert are formed in the plurality of mounting surfaces,
One of the plurality of attachment surfaces intersects with the outer circumferential surface of the body and is gradually inclined radially outward from the front end side to the rear end side of the body with respect to the rotation center axis of the body. 1 mounting surface,
ing,
The first mounting surface has a convex part or a concave part that engages with a concave part or a convex part provided on the outer surface of the cutting insert.
body. A cutting tool comprising a cutting insert and a body having an insert mounting seat on which the cutting insert is mounted,
The cutting insert is
A pair of end faces of a parallelogram facing each other,
a cutting edge formed along a side that partitions the end surface;
four side surfaces provided between the end surfaces;
a through hole opened at the side surfaces facing each other;
a concave portion or a convex portion provided on the side surface;
has
The insert mounting seat of the body is
At least two mounting surfaces on which the side surfaces of the cutting insert come into contact have screw holes into which the screws passed through the through holes can be screwed,
A first mounting surface of the at least two mounting surfaces that intersects with the outer circumferential surface of the body is gradually inclined radially outward from the front end side to the rear end side of the body with respect to the rotation center axis of the body. and a convex portion or a concave portion that engages with the concave portion or the convex portion of the cutting insert;
Cutting tools. The opening of the through hole of the cutting insert opens at the side surface without extending over the ridgeline between the adjacent side surfaces.
The cutting tool according to claim 4. The through hole of the cutting insert is formed perpendicular to the side surface on which the opening of the through hole is formed.
The cutting tool according to claim 4 or 5.

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