JP2021120168A - Tool body of and cartridge for cutting tool with replaceable cutting tip - Google Patents

Abstract

To prevent wear and plastic deformation of an insert attachment seat due to pressing force when attaching a cutting insert or by a cutting load without occurrence of crack from a relief part.SOLUTION: A tool body comprises a recessed insert attachment seat 2 to which a cutting insert is detachably attached, the insert attachment seat 2 including: an attachment seat bottom surface 2a; attachment seat wall surfaces 2b, 2c; and relief parts 2d1 to 2d3 which are formed on the corner parts at which the attachment seat bottom surface 2a and the attachment seat wall surfaces 2b, 2c cross and on a corner part at which the attachment seat wall surfaces 2b, 2c cross each other, and are recessed with respect to the attachment seat bottom surface 2a and the attachment seat wall surfaces 2b, 2c. Surfaces of the attachment seat bottom surface 2a and the attachment seat wall surfaces 2b, 2c are formed from a hard layer 6 comprising a hard metal, and surfaces of the relief parts 2d1 to 2d3 are formed from a steel material.SELECTED DRAWING: Figure 4

Description

The present invention relates to a tool body of a cutting tool with a replaceable cutting edge provided with a concave insert mounting seat to which a cutting insert can be detachably attached, and a cartridge to be detachably attached to the tool body of such a cutting tool with a replaceable cutting edge. Is.

The entire tool body of such a cutting tool with a replaceable cutting edge, including the insert mounting seat, is formed of a steel material having a hardness lower than that of a hard material such as a cemented carbide that normally forms a cutting insert. However, in the tool body of such a cutting tool with a replaceable cutting edge, when the cutting insert is attached to the insert mounting seat with a clamp screw or the like, a pressing force is applied to the cutting insert so as to press it against the mounting seat wall surface of the insert mounting seat. This allows the cutting insert to be firmly fixed.

Moreover, even during cutting, a pressing force that presses the cutting insert against the mounting seat wall surface of the insert mounting seat acts due to the cutting load acting on the cutting edge. For this reason, the high hardness cutting insert causes wear and plastic deformation on the mounting seat wall surface of the insert mounting seat, and when using a new cutting edge, the cutting insert is reattached to the insert mounting seat or the cutting insert is replaced. If this happens, the mounting accuracy may be impaired, and the cutting insert may rattle or the cutting accuracy may be impaired.

Therefore, for example, in Patent Document 1, structural alloy steel is used as a constituent material in a tool body of a columnar or disc-shaped cutting tool with a replaceable cutting edge to which a flat plate-shaped throw-away tip (cutting insert) is detachably attached. It is described that a surface hardened layer of 0.01 to 0.4 mm is formed on the surface layer portion of the tool body by subjecting the tool body to be tempered and then further subjected to nitriding treatment. ..

Further, Patent Document 2 includes a rotary holder (tool body) having a plurality of insert sheets (insert mounting seats) for accommodating a cutting insert made of a hard material, and the rotary holder is partially hardened or entirely. It is described that it is made from tool steel with a hardness of 40-52 HRC and is hardened and hardened before machining the insert sheet.

Further, Patent Document 3 includes a holder body (tool body) having one or more insert mounting seats for accommodating a cutting insert made of a hard material such as cemented carbide, cermet, or ceramic. Is manufactured from steel and has a surface in which at least a portion of the holder body is deeply hardened and at least a portion of this portion of the holder body is further strain hardened.

Japanese Unexamined Patent Publication No. 2000-271813 Special Table 2000-509106 Gazette Japanese Patent Application Laid-Open No. 2008-591701

However, as described in Patent Document 1, the surface-hardened layer obtained by the nitriding treatment as described in Patent Document 1 has a hardness of about HV1000 for gas nitriding and a hardness of about HV700 to 900 for liquid nitriding. Since it can only be obtained and the depth of the surface hardened layer is as shallow as 0.01 to 0.4 mm as described above, wear and plastic deformation of the insert mounting seat due to the cutting insert made of a hard material such as cemented carbide are sufficient. Cannot be prevented.

This also applies to the tool body of the cutting tool with replaceable cutting edge described in Patent Documents 2 and 3, and the hardness of the hardened tool body in Patent Document 2 is 40 to 52 HRC as described above, and Patent Document 3 Even in the described tool body, the hardness is HRC36 or HRC40, and it is still impossible to sufficiently prevent wear and plastic deformation of the insert mounting seat due to a cutting insert made of a hard material such as cemented carbide.

On the other hand, for example, the periphery of the insert mounting seat of the tool body is made of the same cemented carbide as the cutting insert, and by attaching this cartridge to the tool body by brazing or the like, the insert mounting seat is worn or plastic. It is also possible to prevent deformation.

However, in such an insert mounting seat, generally, the mounting seat bottom surface in which the seating surface of the cutting insert is in close contact and the mounting seat wall surface extending in a direction intersecting the mounting seat bottom surface and in contact with the side surface of the cutting insert. At the corners where and the mounting seat walls intersect, on the bottom of the mounting seat and the mounting seat wall surface to avoid interference between the corners between the seating surface and the side surface of the cutting insert and the corners between the side surfaces. On the other hand, a recessed relief portion is formed.

Therefore, if the entire insert mounting seat is made of a hard material such as cemented carbide, which has high hardness but low toughness, it depends on the cutting load when mounting the cutting insert with a clamp screw or the like or during cutting. When stress is concentrated on the corners where the bottom surface of the mounting seat and the wall surface of the mounting seat intersect or the relief portions formed at the corners where the wall surfaces of the mounting seat intersect each other due to the pressing force acting on the bottom surface of the mounting seat and the wall surface of the mounting seat. , There is a risk that cracks will occur in the cartridge from the relief portion formed of cemented carbide or the like having poor toughness.

The present invention has been made under such a background, and it is possible to prevent wear and plastic deformation of the insert mounting seat when mounting a cutting insert or due to a pressing force due to a cutting load without causing a crack from a relief portion. It is an object of the present invention to provide a tool body of a possible replaceable cutting tool and a cartridge that can be detachably attached to the tool body of such a replaceable cutting tool.

In order to solve the above problems and achieve such an object, the tool body of the cutting tool with a replaceable cutting edge of the present invention has a replaceable cutting edge equipped with a concave insert mounting seat to which a cutting insert can be detachably attached. In the tool body of the tool, the insert mounting seat is a mounting where the seating surface of the cutting insert is in close contact with the bottom surface of the mounting seat and the side surface of the cutting insert is in contact with the bottom surface of the cutting insert extending in a direction intersecting the bottom surface of the mounting seat. A relief portion formed on the seat wall surface, a corner where the mounting seat bottom surface and the mounting seat wall surface intersect, and a corner portion where the mounting seat wall surfaces intersect each other, and which is recessed with respect to the mounting seat bottom surface and the mounting seat wall surface. The bottom surface of the mounting seat and the surface of the wall surface of the mounting seat are formed of a hard layer made of cemented carbide, and the surface of the relief portion is formed of a steel material.

In the tool body of the cutting tool with replaceable cutting edge configured in this way, the bottom surface of the mounting seat and the surface of the wall surface of the mounting seat that come into contact with the cutting insert are formed by a hard layer made of cemented carbide. Even if the pressing force when attaching a cutting insert made of a hard material such as cemented carbide to the insert mounting seat or the pressing force due to the cutting load during cutting acts on the bottom surface of the mounting seat and the wall surface of the mounting seat, the insert mounting seat It is possible to suppress the occurrence of wear and plastic deformation.

Therefore, when the cutting insert is reattached to the insert mounting seat when using a new cutting edge, or when the cutting insert is replaced, it is possible to prevent the mounting accuracy from being impaired, and the cutting insert rattles. It is possible to prevent the cutting accuracy from being impaired.

On the other hand, the surface of the relief portion formed at the corner where the bottom surface of the mounting seat and the wall surface of the mounting seat intersect and the corner where the wall surfaces of the mounting seat intersect each other has higher toughness than the cemented carbide, for example, the tool body. Since it is formed of the steel material which is the material of the above, even if stress is concentrated on this relief portion, it is possible to prevent cracks from being generated from the relief portion. Therefore, the life of the tool body can be extended.

Here, it is desirable that the thickness of this hard layer is 0.1 mm or more. If the thickness of the hard layer is less than 0.1 mm, the hard layer may be cracked or the like due to the pressing force as described above. However, even if the thickness of the hard layer is too thick, the effect of preventing wear and plastic deformation will not be improved. Therefore, it is desirable that the thickness of the hard layer is 5 mm or less.

In order to form a hard layer made of cemented carbide on the bottom surface of the mounting seat and the surface of the wall surface of the mounting seat in this way, for example, a plate material of cemented carbide is brazed to the bottom surface of the mounting seat and the surface of the wall surface of the mounting seat. It may be joined by brazing or the like to form a hard layer. Alternatively, the tool body having the powder layer as the hard layer made of cemented carbide on the bottom surface of the mounting seat and the surface of the wall surface of the mounting seat is laminated and molded by the binder jet method or the inkjet method, and then degreased and sintered. A hard layer made of cemented carbide may be formed.

It should be noted that such an insert mounting seat may be formed on a cartridge that can be detachably attached to the tool body. That is, the cartridge of the present invention is a cartridge characterized in that it can be detachably attached to the tool body of such a cutting tool with a replaceable cutting edge.

By forming the insert mounting seat into a cartridge that can be detachably attached to the tool body in this way, even if the insert mounting seat is damaged, only the cartridge needs to be replaced, for example, like a cutter with a replaceable cutting edge. Even when a plurality of insert mounting seats are formed on the tool body, it is possible to avoid a situation in which the entire tool body is replaced due to damage to one insert mounting seat.

As described above, according to the present invention, it is possible to prevent wear and plastic deformation of the insert mounting seat when mounting a cutting insert or due to a pressing force due to a cutting load, and when replacing a cutting insert, a new cutting insert can be used. It is possible to prevent rattling and impaired cutting accuracy, and it is also possible to prevent cracks from being generated from the relief portion due to stress concentration due to such pressing force.

It is a perspective view of the cutting edge exchange type cutting tool which attached the cutting insert to one Embodiment of the tool body of the cutting edge exchange type cutting tool of this invention. It is a side view of the cutting tool of the cutting edge exchange type shown in FIG. It is a bottom view of the cutting tool of the cutting edge exchange type shown in FIG. It is an enlarged perspective view around the insert mounting seat of the embodiment shown in FIG. It is an enlarged bottom view around the insert mounting seat of the embodiment shown in FIG.

1 to 3 show a cutting tool with a replaceable cutting edge in which a cutting insert is attached to an embodiment of a tool body of the cutting tool with a replaceable cutting edge of the present invention, and FIGS. 4 and 5 show the one embodiment. It shows the tool body of the cutting tool with replaceable cutting edge. In the present embodiment, the cutting insert 3 is detachably attached to the insert mounting seat 2 formed on the outer periphery of the tip of the cutter body 1 which is rotated around the axis O of the tool body of the cutting tool with a replaceable cutting edge of the present invention. A case where it is applied to the cutter body 1 of a cutter having a replaceable cutting edge will be described.

The cutter body 1 which is the tool body in the present embodiment is integrally formed of a steel material such as SKD61 in a disk shape centered on the axis O, and the rear end portion of the cutter body 1 is formed with a cylindrical mounting portion 1A. Therefore, a key groove 1a for attaching the cutter body 1 is formed in the attachment portion 1A at the tip end portion of an arbor (not shown) attached to the spindle of the machine tool. Further, the tip portion of the cutter body 1 is formed in an annular shape having a diameter larger than that of the mounting portion 1A to form a cutting edge portion 1B.

In such a cutter body 1, the key at the tip of the arbor is fitted into the key groove 1a of the mounting portion 1A, and a clamp bolt (not shown) inserted through the mounting portion 1A and the inner peripheral portion of the cutting edge portion 1B is an arbor. By being screwed into the tip of the machine tool, it is attached to the tip of the arbor and attached to the spindle of the machine tool via the arbor.

The cutter body 1 mounted on the spindle of the machine tool in this way is rotated in the cutter rotation direction T around the axis O, and is normally sent out in a direction perpendicular to the axis O, and is mounted on the insert mounting seat 2. The work material is cut by the cutting edge 3a of the cutting insert 3.

On the outer peripheral portion of the cutting edge portion 1B having a diameter larger than that of the mounting portion 1A, a plurality of (four in this embodiment) concave groove-shaped tip pockets 4 are arranged at equal intervals in the circumferential direction on the tip side of the cutter body 1. It is formed so as to go toward the inner circumference side as it goes toward it. The insert mounting seat 2 is integrally formed with the cutter main body 1 at the tip of the wall surface of these tip pockets 4 facing the cutter rotation direction T so as to be recessed on the side opposite to the cutter rotation direction T.

These insert mounting seats 2 are cut by extending in the flat mounting seat bottom surface 2a in which the seating surface 3b of the cutting insert 3 is in close contact with the cutter rotation direction T and the cutter rotation direction T intersecting the mounting seat bottom surface 2a. The mounting seat wall surface 2b facing the inner peripheral side of the tip of the flat cutter body 1 with which the side surface 3c of the insert 3 abuts, the mounting seat wall surface 2c facing the outer peripheral side of the tip, and the mounting seat bottom surface 2a and the mounting seat wall surface 2b, 2c. The first to third relief portions 2d1 to 2d3, which are formed in the corners where the mounting seat walls 2b and 2c intersect with each other and are recessed with respect to the mounting seat bottom surface 2a and the mounting seat wall surfaces 2b and 2c It has.

In the present embodiment, the mounting seat bottom surface 2a is formed in a substantially square shape having diagonal lines in a direction parallel to the axis O and a direction perpendicular to the axis O when viewed from the cutter rotation direction T side, and the central portion of the mounting seat bottom surface 2a. Is formed with a mounting screw hole 2e perpendicular to the mounting seat bottom surface 2a. Further, the mounting seat wall surfaces 2b and 2c extend in a direction that intersects the mounting seat bottom surface 2a at an obtuse angle, and intersect the wall surface of the chip pocket 4 that faces the cutter rotation direction T at an obtuse angle.

Further, of the first to third relief portions 2d1 to 2d3, the first relief formed at the corner where the mounting seat bottom surface 2a and the mounting seat wall surface 2b facing the inner peripheral side of the tip of the cutter body 1 intersect. The portion 2d1 is formed so that the cross section orthogonal to the corner portion forms a concave curved shape such as a concave arc so as to be recessed with respect to the mounting seat bottom surface 2a and the mounting seat wall surface 2b.

Furthermore, the second relief portion 2d2 formed at the corner where the mounting seat bottom surface 2a and the mounting seat wall surface 2c facing the outer peripheral side of the tip of the cutter body 1 intersect, and the corner where the mounting seat wall surfaces 2b and 2c intersect with each other. The third relief portion 2d3 formed in the portion extends in a plane shape that intersects the mounting seat bottom surface 2a, the mounting seat wall surface 2c, and the mounting seat wall surface 2b, 2c at an obtuse angle, and the mounting seat bottom surface 2a and the mounting seat wall surface. It is formed so as to be recessed from 2b and 2c.

The cutting insert 3 attached to the insert mounting seat 2 is formed in a substantially square plate shape in the present embodiment by a metal material such as cemented carbide having a hardness higher than that of the steel material forming the cutter body 1. A positive type in which the four side surfaces 3c, which are the escape surfaces, are inclined toward the inside of the cutting insert 3 from one square surface, which is the rake face 3d, toward the other square surface, which is the seating surface 3b. It is said to be the cutting insert 3 of. The inclination angles of these four side surfaces 3c with respect to the seating surface 3b are equal to the inclination angles of the insert mounting seat 2 with respect to the mounting seat wall surface 2b and 2c with respect to the mounting seat bottom surface 2a.

Further, in one square surface to be the rake face 3d, the four edge portions are the main cutting blades 3a1 of the cutting blades 3a, and the four corner portions are the main cutting blades adjacent to each other in the circumferential direction. Of the cutting edges 3a that intersect at obtuse angles, the secondary cutting edge 3a2 is used. Further, a mounting hole 3e that penetrates the cutting insert 3 is opened at the center of one square surface that is the rake surface 3d and the other square surface that is the seating surface 3b.

In such a cutting insert 3, the rake face 3d is directed in the cutter rotation direction T, the seating surface 3b is brought into close contact with the mounting seat bottom surface 2a, and the two side surfaces 3c adjacent to each other in the circumferential direction are in contact with the mounting seat wall surfaces 2b and 2c. The mounting screw 5 that is brought into contact with the insert mounting seat 2 and inserted into the mounting hole 3e is screwed into the mounting screw hole 2e, so that the seating surface 3b and the two side surfaces 3c are mounted with the mounting seat bottom surface 2a. It is pressed and fixed to the seat wall surfaces 2b and 2c, and is detachably attached to the cutter body 1.

Therefore, the seating surface of the cutting insert 3 is provided on the first relief portion 2d1 formed at the intersecting ridge line portion between the mounting seat bottom surface 2a of the insert mounting seat 2 and the mounting seat wall surface 2b facing the inner peripheral side of the tip of the cutter body 1. The intersecting ridge line portion between the 3b and the side surface 3c that is brought into contact with the mounting seat wall surface 2b is accommodated. Further, the second relief portion 2d2 formed at the intersecting ridge line portion between the mounting seat bottom surface 2a and the mounting seat wall surface 2c facing the outer peripheral side of the tip of the cutter body 1 is brought into contact with the seating surface 3b and the mounting seat wall surface 2c. The intersecting ridgeline portion with the side surface 3c is accommodated. Further, the third relief portion 2d3 formed at the intersecting ridges of the mounting seat wall surfaces 2b and 2c has a side surface 3c of the cutting blades 3a connected to the secondary cutting blade 3a2 directed toward the rear end side of the cutter body 1. The intersecting ridges of each other are accommodated.

The surfaces of the mounting seat bottom surface 2a and the mounting seat wall surfaces 2b and 2c of the insert mounting seat 2 are formed of a hard layer 6 made of cemented carbide. On the other hand, in the first to third relief portions 2d1 to 2d3, the steel material forming the cutter body 1 is left exposed, and the surfaces of the first to third relief portions 2d1 to 2d3 are made of steel material. Is formed by.

In the cutter body 1 (tool body) of the blade tip exchange type cutter configured in this way, the surfaces of the mounting seat bottom surface 2a and the mounting seat wall surfaces 2b and 2c of the insert mounting seat 2 in contact with the cutting insert 3 are thus cemented carbide. Since it is formed by a hard layer 6 made of an alloy, the pressing force when attaching the cutting insert 3 made of the same hard material such as cemented carbide to the insert mounting seat 2 and the pressing force due to the cutting load during cutting are these mountings. Even if it acts on the seat bottom surface 2a and the mounting seat wall surface 2b, it is possible to prevent the insert mounting seat 2 from being worn or plastically deformed.

Therefore, when the cutting insert 3 is reattached to the insert mounting seat 2 when the new cutting edge 3a is used, or when the cutting insert 3 is replaced, the mounting accuracy is impaired due to such wear and plastic deformation. Can be prevented. Therefore, it is possible to prevent the cutting insert 3 that has been reattached or replaced from rattling or the cutting accuracy due to the new cutting edge 3a from being impaired, and stable cutting can be performed with high accuracy. It becomes possible.

On the other hand, the first and second relief portions 2d1 and 2d2 formed at the corners where the mounting seat bottom surface 2a and the mounting seat wall surfaces 2b and 2c intersect, and the corners where the mounting seat wall surfaces 2b and 2c intersect with each other. The surface of the third relief portion 2d3 formed in the portion is formed of a steel material having higher toughness than the cemented carbide. In particular, in the present embodiment, the surface of the first to third relief portions 2d1 to 2d3 is made of steel by exposing the cutter body 1 made of steel as it is.

Therefore, even if the stress is concentrated so as to expand the first to third relief portions 2d1 to 2d3 by the pressing force acting on the mounting seat bottom surface 2a and the mounting seat wall surface 2b and 2c as described above, the first to third relief portions 2d1 to 2d3 are expanded. It is possible to prevent cracks from occurring in the insert mounting seat 2 from the first to third relief portions 2d1 to 2d3. Therefore, according to the tool body of the cutting tool with the above-mentioned structure, the life of the cutter body 1 (tool body) can be extended.

Here, as shown in FIG. 5, it is desirable that the thickness t of the hard layer 6 made of this cemented carbide is 0.1 mm or more. If the thickness t of the hard layer 6 is so thin that it is less than 0.1 mm, the hard layer 6 is cracked and plastically deformed when an excessive pressing force is applied to the mounting seat bottom surface 2a and the mounting seat wall surface 2b and 2c. Etc. may not be suppressed.

However, even if the thickness t of the hard layer 6 is thicker than necessary, the effect of suppressing wear and plastic deformation is not improved, and an expensive cemented carbide is unnecessary to be used, which is inefficient. And it is uneconomical. Therefore, it is desirable that the thickness t of the hard layer 6 is 5 mm or less.

In order to form the hard layer 6 made of cemented carbide on the surfaces of the mounting seat bottom surface 2a and the mounting seat wall surface 2b and 2c of the insert mounting seat 2 in this way, for example, the mounting seat bottom surface 2a and the mounting seat wall surface 2b, A cemented carbide plate may be joined to the surface of 2c by brazing, adhesion, or the like. In this case, the hard layer 6 can be easily controlled to have a thickness t within the above range.

Further, the cutter body 1 (tool body) having a powder layer serving as a hard layer 6 made of cemented carbide on the surface of the mounting seat bottom surface 2a of the insert mounting seat 2 and the mounting seat wall surfaces 2b and 2c is subjected to a binder jet method or an inkjet method. A hard layer 6 made of a cemented carbide may be formed by laminating and molding, then degreasing and sintering. In this case, the adhesive strength of the hard layer 6 to the cutter body 1 can be ensured, and even if a larger pressing force acts, the hard layer 6 can be prevented from peeling or cracking.

By the way, in the above embodiment, the insert mounting seat 2 is integrally formed with the cutter body 1 (tool body), but as a modification of this embodiment, although not shown, it is clamped to the cutter body 1 (tool body). It may be formed on a cartridge that can be detachably attached by a screw or the like. Such a cartridge is an embodiment of the cartridge of the present invention, in which the surfaces of the mounting seat bottom surface 2a and the mounting seat wall surfaces 2b and 2c are formed of a hard layer 6 made of cemented carbide, and the relief portions 2d1 to 2d1. The surface of 2d3 is a cartridge cartridge in which an insert mounting seat 2 made of a steel material is detachably attached to a cutter body 1 (tool body).

By forming the insert mounting seat 2 into a cartridge that can be detachably attached to the tool body in this way, even if the insert mounting seat 2 is damaged, only the cartridge needs to be replaced. Therefore, even when a plurality of insert mounting seats 2 are formed on the cutter main body 1 as in the case of the blade tip exchange type cutter of the above-described embodiment, the entire cutter main body 1 is replaced due to damage to one insert mounting seat 2. It is efficient and economical because it is possible to avoid such a situation.

In the above embodiment, the cutting insert 3 can be attached to and detached from the insert mounting seat 2 formed on the outer periphery of the tip of the cutter body 1 which can rotate the tool body of the cutting tool with a replaceable cutting edge of the present invention around the axis O. Although the case where it is applied to the cutter body 1 of the cutting tool with a replaceable cutting edge, which is a turning tool to be attached, has been described, it can also be applied to the cutting tool body of a cutting tool with a replaceable cutting edge, which is a turning tool. It can also be applied to the drill body of a drill with a replaceable cutting edge, which is a drilling tool.

1 Cutter body (tool body)
1A Mounting part 1B Cutting blade part 2 Insert mounting seat 2a Mounting seat bottom surface 2b, 2c Mounting seat wall surface 2d1 to 2d3 Relief part 3 Cutting insert 3a Cutting blade 3b Seating surface 3c Side surface 3d Scooping surface 6 Hard layer O Cutter body 1 axis T Cutter rotation direction t Hard layer thickness

Claims (5)

A tool body of a cutting tool with a replaceable cutting edge that has a concave insert mounting seat to which the cutting insert can be attached and detached.
The insert mounting seat includes a mounting seat bottom surface in which the seating surface of the cutting insert is in close contact, a mounting seat wall surface extending in a direction intersecting the mounting seat bottom surface and abutting the side surface of the cutting insert, and these mounting seat bottom surfaces. It is formed in a corner where the mounting seat wall surface intersects with the mounting seat wall surface and a corner portion where the mounting seat wall surface intersects with each other, and is provided with a relief portion recessed with respect to the mounting seat bottom surface and the mounting seat wall surface.
The bottom surface of the mounting seat and the surface of the wall surface of the mounting seat are formed by a hard layer made of cemented carbide, and
The tool body of a cutting tool with a replaceable cutting edge, characterized in that the surface of the relief portion is made of a steel material. The tool body of the cutting tool with a replaceable cutting edge according to claim 1, wherein the thickness of the hard layer is in the range of 0.1 mm to 5 mm. The hard layer is formed by joining cemented carbide plates or laminating and molding the tool body having a powder layer that becomes the hard layer made of cemented carbide by a binder jet method or an inkjet method, and then degreasing and sintering. The tool body of the cutting tool with a replaceable cutting edge according to claim 1 or 2, wherein the cutting tool is formed by the above. The tool body of the cutting tool with a replaceable cutting edge according to any one of claims 1 to 3, wherein the insert mounting seat is formed on a cartridge that can be detachably attached to the tool body. A cartridge characterized in that it can be detachably attached to a tool body of the cutting tool with a replaceable cutting edge according to claim 4.

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