JP7117389B2 - Manufacturing method of cutting insert, cutting tool and cutting work - Google Patents

Description

Cross-reference to related applications

This application claims priority from Japanese Patent Application No. 2018-182046 filed on September 27, 2018, and the entire disclosure of this earlier application is incorporated herein for reference.

This aspect relates generally to cutting inserts for use in cutting work materials. Specifically, it relates to a cutting insert used for turning. More specifically, it relates to a cutting insert used in thread cutting or the like.

As a cutting insert used for threading a work material such as metal, for example, the inserts described in JP-A-2008-254164 (Patent Document 1) and JP-A-2009-539637 (Patent Document 2) are known. be done. The insert described in Patent Literature 1 has a pair of cutting edge portions that are located at common edges of the front and back surfaces of the insert body and protrude outward when viewed from the direction facing the front and back surfaces. The four protruding surfaces of the pair of cutting edge portions facing the front and back sides are rake surfaces, and thread cutting edges are formed on the edges of these protruding surfaces.

In order to increase the height of the threads during thread cutting, it is required to increase the size of the cutting edge. However, if the pair of cutting parts is simply enlarged, for example, one of the pair of cutting parts that is not used in thread cutting interferes with the work material. Restrictions may apply. Therefore, there is a demand for a cutting insert that has less processing restrictions even in thread cutting with a high thread.

A cutting insert according to one aspect comprises a base, a first cutting portion, and a second cutting portion. The base has a first surface having a first angle, a second surface opposite the first surface and having a second angle, a third surface located between the first surface and the second surface; with the second corner opposite the first corner. The first cutting portion includes a first subsurface connected to the first corner, a second subsurface connected to the third surface, and a first blade positioned at the intersection of the first subsurface and the second subsurface. , projecting outwardly from the base. The second cutting portion includes a third subsurface connected to the second corner, a fourth subsurface connected to the third surface, and a second blade positioned at the intersection of the third subsurface and the fourth subsurface. , projecting outwardly from the base. The first cutting portion separates from the second surface. The second cutting portion separates from the first surface. The first blade includes a first tip blade that is convex outward from the base, a linear first straight blade that extends from the first tip blade toward the first corner, and a first tip blade that extends from the first tip blade to the first corner. and a second linear blade extending toward one corner and having a linear shape. When the first surface is viewed in plan, the first straight blade is positioned closer to the second cutting portion than the second straight blade. The second blade includes a second tip blade that is convex outward from the base, a third straight blade that extends from the second tip blade toward the second corner, and a third straight blade that extends from the first tip blade to the second corner. and a straight fourth straight blade extending toward one corner. When the second surface is viewed in plan, the third straight blade is positioned closer to the first cutting portion than the fourth straight blade. The first straight blade and the third straight blade intersect when seen from the first surface side. The second minor surface has a flat area located along the second straight edge. The region slopes outward as it moves away from the second straight blade .
A cutting insert according to one aspect comprises a base, a first cutting portion, and a second cutting portion. The base has a first surface having a first angle, a second surface opposite the first surface and having a second angle, a third surface located between the first surface and the second surface; with the second corner opposite the first corner. The first cutting portion includes a first subsurface connected to the first corner, a second subsurface connected to the third surface, and a first blade positioned at the intersection of the first subsurface and the second subsurface. , projecting outwardly from the base. The second cutting portion includes a third subsurface connected to the second corner, a fourth subsurface connected to the third surface, and a second blade located at the intersection of the third subsurface and the fourth subsurface. , projecting outwardly from the base. The first cutting portion separates from the second surface. The second cutting portion separates from the first surface. The first blade includes a first tip blade that is convex outward from the base, a linear first straight blade that extends from the first tip blade toward the first corner, and a first tip blade that extends from the first tip blade to the first corner. and a second linear blade extending toward one corner and having a linear shape. When the first surface is viewed in plan, the first straight blade is positioned closer to the second cutting portion than the second straight blade. The second blade includes a second tip blade that is convex outward from the base, a third straight blade that extends from the second tip blade toward the second corner, and a third straight blade that extends from the first tip blade to the second corner. and a straight fourth straight blade extending toward one corner. When the second surface is viewed in plan, the third straight blade is positioned closer to the first cutting portion than the fourth straight blade. The first straight blade and the third straight blade intersect when seen from the first surface side. The second straight blade is farther from the second surface than the first straight blade.

1 is a perspective view of a non-limiting one-sided cutting insert of the present disclosure; FIG. 2 is a plan view of the cutting insert shown in FIG. 1 as seen from the first surface side; FIG. FIG. 2 is a plan view of the cutting insert shown in FIG. 1 as seen from the second surface side; It is the side view which looked at the cutting insert shown in FIG. 2 from A1 direction. It is the side view which looked at the cutting insert shown in FIG. 2 from A2 direction. 2 is an enlarged view of a region B1 shown in FIG. 1; FIG. 3 is an enlarged view of a region B2 shown in FIG. 2; FIG. 4 is an enlarged view of a region B3 shown in FIG. 3; FIG. 5 is an enlarged view of a region B4 shown in FIG. 4; FIG. 8 is a cross-sectional view of the cutting insert shown in FIG. 7 taken along line XX. FIG. FIG. 8 is a cross-sectional view of the XI-XI cross section of the cutting insert shown in FIG. 7; 1 is a perspective view of a non-limiting one-sided cutting tool of the present disclosure; FIG. 13 is an enlarged view of a region B5 shown in FIG. 12; FIG. 1 is a schematic diagram illustrating one step of a non-limiting one-sided machined workpiece manufacturing method in the present disclosure; FIG. 1 is a schematic diagram illustrating one step of a non-limiting one-sided machined workpiece manufacturing method in the present disclosure; FIG. 1 is a schematic diagram illustrating one step of a non-limiting one-sided machined workpiece manufacturing method in the present disclosure; FIG.

<Insert>
Hereinafter, cutting inserts 1 (hereinafter also simply referred to as inserts 1) of a plurality of embodiments will be described in detail with reference to the drawings. However, in each drawing referred to below, for convenience of explanation, only main members necessary for explaining each embodiment are shown in a simplified manner. Accordingly, the insert 1 may comprise any components not shown in the referenced figures. Also, the dimensions of the members in each drawing do not faithfully represent the dimensions of the actual constituent members, the dimensional ratios of the respective members, and the like.

The insert 1 illustrated in FIGS. 1 to 11 is a cutting insert that can be used for thread cutting. The insert 1 has a base portion 3, a first cutting portion 5 and a second cutting portion 7, and may generally have a polygonal plate shape as a whole. Specifically, as shown in FIG. 1, the insert 1 may be generally triangular plate shaped. In addition, the insert 1 is not limited to a triangular plate shape, and may be, for example, a square plate shape or a pentagonal plate shape.

The base portion 3 may be used as a portion to be restrained by the holder when the insert 1 is attached to the holder of the cutting tool. The first cutting portion 5 and the second cutting portion 7 may be used as portions that come into contact with the work material during cutting of the work material and play a major role in the cutting process. Note that the first cutting portion 5 and the second cutting portion 7 do not need to be used simultaneously in one cutting process. In other words, either one of the first cutting portion 5 and the second cutting portion 7 may be used in one cutting process.

As in the example shown in FIG. 1, the base 3 may have a first side 9, a second side 11 and a third side 13 and may be generally plate-shaped. The first surface 9 may have multiple corners including the first corner 15 and multiple sides, as in the example shown in FIG. Each corner of the first surface 9 may be sandwiched between two adjacent sides of the first surface 9 . The second surface 11 may be located opposite the first surface 9 . The second surface 11 may have multiple corners including the second corner 17 and multiple sides, as in the example shown in FIG. Each corner of the second surface 11 may be sandwiched between two adjacent sides of the second surface 11 .

The second corner 17 may be located opposite the first corner 15, as in the example shown in FIG. At this time, at least a portion of the first corner 15 may overlap at least a portion of the second corner 17 when viewed from the first surface 9 side as shown in FIG. The third surface 13 may be located between the first surface 9 and the second surface 11 . The third surface 13 may be separate from the first surface 9 and the second surface 11 or may be connected to the first surface 9 and the second surface 11 as in the example shown in FIG.

Here, an imaginary straight line passing through the center of the first surface 9 and the center of the second surface 11 is defined as the central axis L1. A virtual plane located between the first surface 9 and the second surface 11 and perpendicular to the central axis L1 is defined as a reference plane S1. The reference surface S1 may be positioned so that the distance between the first surface 9 and the second surface 11 is the same.

The base 3 may have through holes 19 that are open on the first surface 9 and the second surface 11 . The through holes 19 may be used, for example, to insert screws when fixing the insert 1 to the holder. By inserting a screw into the through hole 19 and fixing the screw to the holder, the insert 1 can be fixed to the holder. Means for fixing the insert 1 to the holder are not limited to screws. For example, a clamping member may be used to secure the insert 1 to the holder.

The through hole 19 may be opened to include the center of the first surface 9 and the center of the second surface 11 . As in the example shown in FIG. 2 , the center of the through hole 19 on the side of the first surface 9 may coincide with the center of the first surface 9 . As in the example shown in FIG. 3 , the center of the through-hole 19 on the second surface 11 side may coincide with the center of the second surface 11 .

The first cutting portion 5 may have a first minor surface 21 , a second minor surface 23 and a first blade 25 . The first cutting portion 5 may project outward from the base portion 3 . As in the example shown in FIG. 2, when the first surface 9 is viewed in plan, the first cutting portion 5 may protrude outward from the region where the first corner 15 is located.

The first minor surface 21 is a surface area corresponding to the first surface 9 of the base 3 and may be connected to the first surface 9 . The second minor surface 23 is a surface area corresponding to the third surface 13 of the base 3 and may be connected to the third surface 13 . The first blade 25 may be located at the intersection of the first minor surface 21 and the second minor surface 23 . Here, the first blade 25 may be located on the entire intersection of the first minor surface 21 and the second minor surface 23, or only a part of the intersection of the first minor surface 21 and the second minor surface 23. may be located in

The work material can be cut by bringing the first blade 25 into contact with the work material. At this time, the first subsurface 21 may function as a so-called rake surface. Moreover, the second subsurface 23 may function as a so-called flank.

The first cutting portion 5 may have a shape in which the width becomes narrower as the distance from the base portion 3 increases when the first surface 9 is viewed in plan. That is, the intersection of the first subsurface 21 and the second subsurface 23 may be V-shaped. Specifically, the first blade 25 may have a first tip blade 27, a first straight blade 29 and a second straight blade 31, as in an example shown in FIG.

As in the example shown in FIG. 7, the first cutting edge 27 may have an outwardly convex curved shape. As in the example shown in FIG. 7 , the first straight edge 29 may have a straight shape extending from the first tip edge 27 toward the first corner 15 of the base 3 . As in the example shown in FIG. 7 , the second straight edge 31 may have a straight shape extending from the first tip edge 27 toward the first corner 15 of the base 3 . Here, the bisector of the intersection of the V-shaped first subsurface 21 and the second subsurface 23 when the first surface 9 is viewed from above is defined as V1.

The first tip edge 27 may be positioned between the first straight edge 29 and the second straight edge 31 . As in the example shown in FIG. 7 , the first straight blade 29 may be positioned closer to the second cutting portion 7 than the second straight blade 31 when the first surface 9 is viewed from above. The distance between the first straight edge 29 and the second straight edge 31 may increase as the distance from the first tip edge 27 increases. Specifically, the distance between the first straight blade 29 and the second straight blade 31 in the direction orthogonal to the bisector V1 may increase as the distance from the first tip blade 27 increases.

In addition to the first tip edge 27 , the first straight edge 29 and the second straight edge 31 , the first blade 25 includes a first wiper edge 59 , a second wiper edge 61 , a first curved edge 63 and a second curved edge 65 . may further have The first curved blade 63 may be connected to the first straight blade 29 and may have a concave curved shape when the first surface 9 is viewed from above. The second curved blade 65 may be connected to the second straight blade 31 and may have a concave curved shape when the first surface 9 is viewed from above.

A first wiper edge 59 is connected to a first curvilinear edge 63 and can be used to flatten the crest of the threads in the threading process. A second wiper edge 61 is connected to a second curvilinear edge 65 and can be used to flatten the top of the thread in the threading process. When the first surface 9 is viewed in plan, the first wiper edge 59 and the second wiper edge 61 may be positioned on one straight line.

The second minor surface 23 may have a flat first region 23 a located along the first straight edge 29 . The second minor surface 23 may also have a flat second region 23b located along the second straight edge 31 . When the second minor surface 23 has the first region 23a, the durability of the first cutting portion 5 against the cutting load applied to the first straight blade 29 is high. Further, when the second subsurface 23 has the second region 23b, the durability of the first cutting portion 5 against the cutting load applied to the second straight blade 31 is high.

The second region 23b may be inclined outward as it separates from the second straight blade 31 . In this case, the durability of the first cutting portion 5 against the cutting load applied to the second straight blade 31 is even higher. As in the example shown in FIG. 9 , the second region 23 b may be inclined away from the second cutting portion 7 as it separates from the second straight edge 31 .

The second cutting portion 7 may have a third minor surface 33 , a fourth minor surface 35 and a second blade 37 . The second cutting portion 7 may project outward from the base portion 3 . As in the example shown in FIG. 3, when the second surface 11 is viewed in plan, the second cutting portion 7 may protrude outward from the region where the second corner 17 is located.

The third minor surface 33 is a surface area corresponding to the second surface 11 of the base 3 and may be connected to the second surface 11 . The fourth minor surface 35 is a surface area corresponding to the third surface 13 of the base 3 and may be connected to the third surface 13 . The second blade 37 may be located at the intersection of the third minor surface 33 and the fourth minor surface 35 . Here, the second blade 37 may be located on the entire intersection of the third minor surface 33 and the fourth minor surface 35, or only a part of the intersection of the third minor surface 33 and the fourth minor surface 35. may be located in

The work material can be cut by bringing the second blade 37 into contact with the work material. At this time, the third subsurface 33 may function as a so-called rake surface. Moreover, the fourth subsurface 35 may function as a so-called flank.

The second cutting portion 7 may have a shape in which the width becomes narrower as the distance from the base portion 3 increases when the second surface 11 is viewed from above. That is, the intersection of the third subsurface 33 and the fourth subsurface 35 may be V-shaped. Specifically, the second blade 37 may have a second tip blade 39, a third straight blade 41 and a fourth straight blade 43, as in an example shown in FIG.

As in the example shown in FIG. 8, the second cutting edge 39 may have an outwardly convex curved shape. As an example shown in FIG. 8 , the third straight edge 41 may have a straight shape extending from the second tip edge 39 toward the second corner 17 of the base 3 . As an example shown in FIG. 8 , the fourth straight edge 43 may have a straight shape extending from the second tip edge 39 toward the second corner 17 of the base 3 . Here, the bisector of the intersection of the V-shaped third subsurface 33 and the fourth subsurface 35 in plan view of the second surface 11 is defined as V2.

The second tip edge 39 may be positioned between the third straight edge 41 and the fourth straight edge 43 . As in the example shown in FIG. 8 , the third straight edge 41 may be located closer to the first cutting portion 5 than the fourth straight edge 43 when the second surface 11 is viewed from above. The distance between the third straight edge 41 and the fourth straight edge 43 may increase as the distance from the second tip edge 39 increases. Specifically, the distance between the third straight blade 41 and the fourth straight blade 43 in the direction perpendicular to the bisector V2 may increase as the distance from the second tip blade 39 increases.

In addition to the second tip edge 39, the third straight edge 41 and the fourth straight edge 43, the second edge 37 includes a third wiper edge 67, a fourth wiper edge 69, a third curved edge 71 and a fourth curved edge 73. may further have The third curved blade 71 may be connected to the third straight blade 41 and may have a concave curved shape when the second surface 11 is viewed from above. The fourth curved blade 73 may be connected to the fourth straight blade 43 and may have a concave curved shape when the second surface 11 is viewed from above.

A third wiper edge 67 is connected to the third curvilinear edge 71 and can be used to flatten the top of the thread in the threading process. A fourth wiper edge 69 is connected to a fourth curvilinear edge 73 and can be used to flatten the top of the thread in the threading process. When the second surface 11 is viewed in plan, the third wiper edge 67 and the fourth wiper edge 69 may be positioned on one straight line.

The fourth minor surface 35 may have a flat third region 35 a located along the third straight edge 41 . The fourth minor surface 35 may also have a flat fourth region 35b located along the fourth straight edge 43. As shown in FIG. When the fourth subsurface 35 has the third region 35a, the durability of the second cutting portion 7 against the cutting load applied to the third straight blade 41 is high. Further, when the fourth subsurface 35 has the fourth region 35b, the durability of the second cutting portion 7 against the cutting load applied to the fourth straight edge 43 is high.

The fourth region 35b may be inclined outward as it separates from the fourth linear blade 43 . In this case, the durability of the second cutting portion 7 against the cutting load applied to the fourth straight blade 43 is even higher. As in the example shown in FIG. 6, the fourth region 35b may be inclined away from the first cutting portion 5 as it separates from the fourth linear blade 43 .

The insert 1 may have portions other than the first cutting portion 5 and the second cutting portion 7 as cutting portions. For example, the insert 1 may have a third cutting portion 45, a fourth cutting portion 47, a fifth cutting portion 49 and a sixth cutting portion 51, as in the example shown in FIGS.

The first cutting portion 5, the third cutting portion 45, and the fourth cutting portion 47 may be positioned so as to overlap each other when the insert 1 is rotated 120° with respect to the central axis L1. The second cutting portion 7, the fifth cutting portion 49, and the sixth cutting portion 51 may be positioned so as to overlap when the insert 1 is rotated 120° with respect to the central axis L1.

The first cutting portion 5 and the second cutting portion 7 in the embodiment may not be positioned from the first surface 9 to the second surface 11 . Specifically, the first cutting portion 5 may be separated from the second surface 11 . Also, the second cutting portion 7 may be separated from the first surface 9 . In this case, when cutting is performed using the first blade 25, the second cutting portion 7 is less likely to interfere with the work material. In addition, since the first cutting portion 5 is separated from the second surface 11 , the first cutting portion 5 is less likely to interfere with the work material even when cutting is performed using the second blade 37 . Therefore, there are few processing restrictions even in thread cutting processing with a high thread.

Moreover, when the base 3 has a through hole 19 as in the example shown in FIG. It is easy to secure a wide interval between Therefore, the durability of the insert 1 is high.

The first blade 25 and the second blade 37 may be positioned so as to intersect each other when seen from the first surface 9 side. When the first blade 25 and the second blade 37 are positioned as described above, it is easy to make the first blade 25 and the second blade 37 large. Therefore, it is possible to process even higher threads.

When the first edge 25 has the first tip edge 27 and the first straight edge 29 and the second edge 37 has the second tip edge 39 and the third straight edge 41, the plane from the first surface 9 side When seen through, the first straight blade 29 and the third straight blade 41 may intersect.

When the first cutting edge 25 and the second cutting edge 37 are positioned as described above, the distance between the first tip cutting edge 27 and the second tip cutting edge 39 can be easily maintained appropriately when the first surface 9 is viewed from above. Therefore, when performing cutting using the first blade 25, the second cutting portion 7 is less likely to interfere with the work material. Also, when performing cutting using the second blade 37, the first cutting portion 5 is less likely to interfere with the work material.

The first cutting portion 5 may have a fifth minor surface 53 . The fifth minor surface 53 may be located on the opposite side of the first minor surface 21 as in the example shown in FIG. As such, the second minor surface 23 may be located between the first minor surface 21 and the fifth minor surface 53 . Since the first cutting portion 5 is separated from the second surface 11 as in the example shown in FIG. 9 , the fifth minor surface 53 may be separated from the second surface 11 .

The fifth minor surface 53 may approach the first surface 9 as it separates from the base 3 . For example, as in the cross section shown in FIG. 10 , the fifth subsurface 53 may be inclined upward where the first surface 9 is located from the right side where the base 3 is located toward the left side. In this case, the durability of the first cutting portion 5 is high when cutting is performed using the first blade 25, and the first cutting portion 5 is durable when cutting is performed using the second blade 37. Hard to interfere with the work material.

Specifically, the portion of the fifth minor surface 53 that is remote from the base 3 is located closer to the first surface 9 than the portion of the fifth minor surface 53 that is closer to the base 3, in other words , may be located away from the second surface 11 . In this case, when cutting is performed using the second blade 37, the tip portion of the first cutting portion 5 is less likely to interfere with the work material.

In addition, the portion of the fifth minor surface 53 near the base 3 is positioned farther from the first surface 9 than the portion of the fifth minor surface 53 that is farther from the base 3 , in other words, the second It may be located near surface 11 . In this case, the durability of the first cutting portion 5 when cutting is performed using the first blade 25 is high, and cracks are less likely to occur in the vicinity of the boundary between the base portion 3 and the first cutting portion 5 .

Moreover, the fifth minor surface 53 may be separated from the second surface 11 as the second cutting portion 7 is approached. In this case, when cutting is performed using the second blade 37, the first cutting portion 5 is less likely to interfere with the work material.

The second cutting portion 7 may have a sixth minor surface 55 . The sixth minor surface 55 may be located on the opposite side of the third minor surface 33 as in the example shown in FIG. As such, the fourth minor surface 35 may be located between the third minor surface 33 and the sixth minor surface 55 . Since the second cutting portion 7 is separated from the first surface 9 as in the example shown in FIG. 9 , the sixth minor surface 55 may be separated from the first surface 9 .

The sixth minor surface 55 may approach the second surface 11 as it separates from the base 3 . For example, in the cross section shown in FIG. 11, the sixth subsurface 55 may be inclined downward where the second surface 11 is located as it goes from the right side where the base 3 is located to the left side. In this case, the durability of the second cutting portion 7 is high when cutting is performed using the second blade 37, and the second cutting portion 7 is durable when cutting is performed using the first blade 25. Hard to interfere with the work material.

Specifically, the portion of the sixth minor surface 55 away from the base 3 is located closer to the second surface 11 than the portion of the sixth minor surface 55 closer to the base 3, in other words , may be located at a distance from the first surface 9 . In this case, when cutting is performed using the first blade 25, the tip portion of the second cutting portion 7 is less likely to interfere with the work material.

In addition, the portion of the sixth minor surface 55 near the base 3 is located farther from the second surface 11 than the portion of the sixth minor surface 55 that is farther from the base 3 , in other words, the first It may be located near plane 9 . In this case, the durability of the second cutting portion 7 when cutting is performed using the second blade 37 is high, and cracks are less likely to occur near the boundary between the base portion 3 and the second cutting portion 7 .

Also, the sixth minor surface 55 may be separated from the first surface 9 as the first cutting portion 5 is approached. In this case, when cutting is performed using the first blade 25, the second cutting portion 7 is less likely to interfere with the work material.

When the first blade 25 has the first tip edge 27, the first straight blade 29 and the second straight blade 31, the second straight blade 31 may be further away from the second surface 11 than the first straight blade 29. . When performing cutting using the first blade 25, the insert 1 may be inclined with respect to the work material in order to prevent the second cutting portion 7 from interfering with the work material.

When the second straight edge 31 is farther from the second surface 11 than the first straight edge 29, even if the insert 1 is inclined as described above, the first straight edge 29 and the second straight edge 31 Small variation in cutting load applied to Therefore, the durability of the insert 1 is high, and the machining accuracy of the work material is also high.

When the second blade 37 has the second tip edge 39 , the third straight blade 41 and the fourth straight blade 43 , the fourth straight blade 43 may be farther from the first surface 9 than the third straight blade 41 . In this case, when the second blade 37 is used for cutting, variations in the cutting load applied to the third straight blade 41 and the fourth straight blade 43 are small. Therefore, the durability of the insert 1 is high, and the machining accuracy of the work material is also high.

The first surface 9 of the base 3 may consist only of a flat surface area, or may have a first inclined surface 57, as in the example shown in FIG. The first slanted surface 57 may be located along the first corner 15 and may be slanted away from the second surface 11 as the distance from the first corner 15 increases. The first inclined surface 57 may function as a so-called breaker wall surface.

When the first surface 9 is viewed in plan, the first inclined surface 57 may have a portion 57 a having a convex curved surface shape toward the first cutting portion 5 .

When the first inclined surface 57 has the portion 57a, when chips generated by the first blade 25 come into contact with the first inclined surface 57, the traveling direction of the chips is reversed on the first inclined surface 57. As a result, chips are less likely to advance toward the first blade 25 . Therefore, chips are less likely to clog. In particular, if at least a portion of the portion 57a is located on the bisector V1 when the first surface 9 is viewed in plan, chips are less likely to clog.

The size of insert 1 is not limited to a specific value. For example, if the insert 1 has a substantially polygonal shape when the first surface 9 is viewed from above, the length of one side may be about 10 to 25 mm. Also, the height from the first surface 9 to the second surface 11 may be about 2 to 8 mm.

Examples of materials for the insert 1 include cemented carbide and cermet. Compositions of cemented carbide include, for example, WC--Co, WC--TiC--Co and WC--TiC--TaC--Co. WC—Co is produced by adding cobalt (Co) powder to tungsten carbide (WC) and sintering it. WC--TiC--Co is obtained by adding titanium carbide (TiC) to WC--Co. WC--TiC--TaC--Co is obtained by adding tantalum carbide (TaC) to WC--TiC--Co.

A cermet is a sintered composite material in which a metal is combined with a ceramic component. Specifically, as a cermet, one having a titanium compound such as titanium carbide (TiC) or titanium nitride (TiN) as a main component can be mentioned.

The surfaces of the above members that make up the insert 1 may be coated with a coating using chemical vapor deposition (CVD) or physical vapor deposition (PVD) methods. The composition of the coating includes titanium carbide (TiC), titanium nitride (TiN), titanium carbonitride (TiCN), alumina (Al ₂ O ₃ ), and the like.

<Cutting tool>
Next, the cutting tool 101 of the embodiment will be described with reference to the drawings.

As shown in FIGS. 12 and 13, the cutting tool 101 of the embodiment is a rod-shaped body extending from a first end (lower left end in FIG. 12) toward a second end (upper right end in FIG. 12). It may comprise a holder 105 with a pocket 103 located on the edge side and the insert 1 described above located in the pocket 103 .

The pocket 103 is a portion where the insert 1 is mounted, and may have a constraining side surface 107 abutting against the third surface of the insert 1 and a seating surface 109 inclined with respect to the constraining side surface 107 . The first surface or the second surface of the insert 1 contacts the seating surface 109 . Also, the pocket 103 may be open on the first end side of the holder 105 .

The insert 1 is located in the pocket 103 . At this time, the base of the insert 1 may be in direct contact with the pocket 103 , or the sheet 111 may be sandwiched between the insert 1 and the pocket 103 .

The insert 1 is mounted so that at least a portion of the cutting portion used as a cutting edge protrudes outward from the holder 105 . The insert 1 may be secured to the holder 105 by means of clamping members 113 .

Steel, cast iron, or the like may be used as the member of the holder 105 . In particular, when steel is used among these members, the toughness of the holder 105 is high.

<Manufacturing method of machined product>
Next, a method for manufacturing a machined product according to the embodiment will be described with reference to the drawings.

The cut work is produced by cutting the work material 201 . In the embodiments, machining for forming thread grooves is exemplified as cutting. A method for manufacturing a cut product according to an embodiment may include the following steps. i.e.
(1) a step of rotating the work material 201;
(2) contacting the rotating work material 201 with the cutting tool 101 represented by the above embodiment;
(3) separating the cutting tool 101 from the work material 201;
may be provided.

More specifically, first, as shown in FIG. 14, the work material 201 is rotated around the axis D in the D1 direction. Also, by moving the cutting tool 101 in the D2 direction, the cutting tool 101 is brought relatively close to the work material 201 . Next, as shown in FIG. 15, the first blade of the cutting tool 101 is brought into contact with the work material 201 to cut the work material 201 .

At this time, the thread groove is formed by cutting the work material 201 while moving the cutting tool 1 in the D3 direction. Note that FIG. 15 shows a simplified process of forming the thread grooves. As specific methods for forming thread grooves, for example, processing methods such as radial infeed and flank infeed are known.

Then, as shown in FIG. 16, by moving the cutting tool 101 in the D4 direction, the cutting tool 101 is moved away from the work material 201 relatively.

As shown in FIG. 14, the cutting tool 101 may be approached while the shaft D is fixed and the work material 201 is rotated. Alternatively, as shown in FIG. 15, the workpiece 201 may be cut by bringing the first blade of the cutting insert into contact with the rotating workpiece 201 . Alternatively, as shown in FIG. 16, the cutting tool 101 may be moved away while the work material 201 is being rotated.

In addition, in the cutting process in the manufacturing method of the embodiment, the cutting tool 101 is brought into contact with the cut material 201 by moving the cutting tool 101 . Further, the cutting tool 101 is separated from the work piece 201 by moving the cutting tool 101 . However, the manufacturing method of the embodiment is not limited to such a form.

For example, in step (1), the work material 201 may be brought closer to the cutting tool 101 . Similarly, in step (3), the work material 201 may be kept away from the cutting tool 101 . In order to continue cutting, the cutting tool 101 is held in a rotating state, and the process of bringing the cutting insert into contact with different portions of the work material 201 may be repeated.

Representative examples of the material of the work material 201 include carbon steel, alloy steel, stainless steel, cast iron, non-ferrous metals, and the like.

1 ... cutting insert (insert)
3... Base 5... First cutting part 7... Second cutting part 9... First surface 11... Second surface 13... Third surface 15... First corner 17 ... second corner L1 ... central axis S1 ... reference surface 19 ... through hole 21 ... first subsurface 23 ... second subsurface 23a ... first region 23b ... second 2 area 25... First edge 27... First tip edge 29... First straight edge 31... Second straight edge 33... Third secondary surface 35... Fourth secondary surface 35a Third region 35b Fourth region 37 Second blade 39 Second tip blade 41 Third straight blade 43 Fourth straight blade 45 Third cutting portion 47... 4th cutting part 49... 5th cutting part 51... 6th cutting part 53... 5th secondary surface 55... 6th secondary surface 57... 1st inclined surface 57a. Part 59 First wiper edge 61 Second wiper edge 63 First curved edge 65 Second curved edge 67 Third wiper edge 69 Fourth wiper edge 71... Third curved blade 73... Fourth curved blade

V1, V2... Bisecting line 101... Cutting tool 103... Pocket 105... Holder 107... Constrained side surface 109... Seating surface 111... Seat 113... Clamp member 201・・・Work material

Claims (8)

a first face having a first corner;
a second surface opposite the first surface and having a second corner;
a third surface located between the first surface and the second surface;
a base with the second corner located opposite the first corner;
a first minor surface connected to the first corner;
a second minor surface connected to the third surface;
a first blade located at the intersection of the first minor surface and the second minor surface;
a first cutting portion projecting outward from the base;
a third minor surface connected to the second corner;
a fourth minor surface connected to the third surface;
a second blade located at the intersection of the third minor surface and the fourth minor surface;
a second cutting portion protruding outward from the base,
The first cutting portion is separated from the second surface,
The second cutting portion is separated from the first surface ,
The first blade is
a first tip blade having a convex shape outward from the base;
a linear first straight blade extending from the first tip blade toward the first corner;
a straight second straight blade extending from the first tip blade toward the first corner;
When the first surface is viewed in plan, the first straight blade is positioned closer to the second cutting portion than the second straight blade,
The second blade is
a second tip blade having a convex shape outward from the base;
a linear third straight blade extending from the second tip blade toward the second corner;
a straight fourth straight blade extending from the first tip blade toward the first corner;
When the second surface is viewed in plan, the third straight blade is positioned closer to the first cutting portion than the fourth straight blade,
When viewed from the side of the first surface, the first straight blade and the third straight blade intersect,
the second minor surface has a flat area located along the second straight blade;
The cutting insert , wherein the region slopes outward with increasing distance from the second straight edge . a first face having a first corner;
a second surface opposite the first surface and having a second corner;
a third surface located between the first surface and the second surface;
a base with the second corner located opposite the first corner;
a first minor surface connected to the first corner;
a second minor surface connected to the third surface;
a first blade located at the intersection of the first minor surface and the second minor surface;
a first cutting portion projecting outward from the base;
a third minor surface connected to the second corner;
a fourth minor surface connected to the third surface;
a second blade located at the intersection of the third minor surface and the fourth minor surface;
a second cutting portion protruding outward from the base,
The first cutting portion is separated from the second surface,
The second cutting portion is separated from the first surface,
The first blade is
a first tip blade having a convex shape outward from the base;
a linear first straight blade extending from the first tip blade toward the first corner;
a straight second straight blade extending from the first tip blade toward the first corner;
When the first surface is viewed in plan, the first straight blade is positioned closer to the second cutting portion than the second straight blade,
The second blade is
a second tip blade having a convex shape outward from the base;
a linear third straight blade extending from the second tip blade toward the second corner;
a straight fourth straight blade extending from the first tip blade toward the first corner;
When the second surface is viewed in plan, the third straight blade is positioned closer to the first cutting portion than the fourth straight blade,
When viewed from the side of the first surface, the first straight blade and the third straight blade intersect,
The cutting insert , wherein the second straight edge is further from the second surface than the first straight edge. The cutting insert according to claim 1 or 2, wherein the first blade and the second blade intersect when seen from the side of the first surface. The first cutting portion has a fifth minor surface located on the opposite side of the first minor surface,
The cutting insert according to any one of claims 1 to 3, wherein the fifth minor surface approaches the first surface as it separates from the base. The cutting insert according to claim 4, wherein the fifth minor surface is away from the second surface as it approaches the second cutting portion. The first surface has a first inclined surface that is inclined away from the second surface as the distance from the first corner increases,
6. The method according to any one of claims 1 to 5, wherein when the first surface is viewed in plan, the first inclined surface has a curved surface portion that is convex toward the first cutting portion. Cutting insert as described. a holder having a pocket located on the side of the first end;
A cutting tool comprising a cutting insert according to any one of claims 1 to 6 located in said pocket. rotating the work material;
A step of bringing the cutting tool according to claim 7 into contact with the rotating work material;
and separating the cutting tool from the work material.

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