JP2007130738A - Cutting tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting tool, using a generalized insert without using a thick insert even in the case of a large depth of cut, and efficiently cutting without lowering cutting speed and feed speed more than needed. <P>SOLUTION: In this cutting tool 1, a mounting eye 12 for removably mounting an insert 18 is formed at the outer periphery of the tip of a tool body rotated round the axis. In the mounting eye 12, a sheet member 15 having a wall surface made of cemented carbide, formed extending toward the tip of the tool body and pointing at the radial outside of the tool and a wall surface 16 pointing at the front side in the rotating direction T of the tool is disposed, and the insert 18 is seated on the wall surface 16 pointing at the front in the rotating direction T of the tool of the sheet member 15, and the side surface pointing at the radial inside of the tool body of the insert 19 is abutted on the wall surface pointing at the radial outside of the tool body of the sheet member 15. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cutting tool in which a plurality of inserts are detachably mounted on the outer periphery of a tip portion of a tool body.

2. Description of the Related Art Conventionally, as a cutting tool for performing planar processing on a workpiece, a face mill having a plurality of inserts mounted on a disk-shaped tool body has been used. In this type of cutting tool, an insert made of a hard material such as cemented carbide is detachably attached to a number of recesses and mounting seats formed on the outer periphery of the tip of the disc-shaped tool body. By rotating the main body around its axis at high speed and feeding it in a direction crossing the axis, the cutting material is cut by the cutting blade directed to the outer side of the tool main body in the radial direction of the insert, and the front end side of the tool main body The material to be cut is flattened with a cutting blade directed toward the surface.
Japanese Patent Laid-Open No. 2001-252813 JP 2001-246515 A

  By the way, as a material to be cut by the above-described cutting tool, for example, there is a tunnel segment used as a reinforcing material for a tunnel after excavating the tunnel. Since this tunnel segment has a substantially U-shaped plate shape and is disposed in the tunnel so that the U-shaped surfaces overlap, it is necessary to finish the U-shaped surface, that is, both end surfaces of the tunnel segment to be flat.

  However, the tunnel segment is usually a casting made of cast iron, and has an uneven surface. Therefore, when cutting the end face of this tunnel segment, it has been necessary to take a large amount of cut. Moreover, the cutting width of the tunnel segment is about several hundred mm, and accordingly, the outer diameter of the tool body is several hundred mm, resulting in heavy cutting in which the cutting speed and amount of cutting of the cutting edge located on the outer peripheral portion are large.

  For this reason, in a cutting tool that cuts the surface of a casting such as a tunnel segment, a large cutting resistance acts and the insert may be lost, resulting in a shortened insert life. It is necessary to use a thick insert so that it can sufficiently withstand this, and a general-purpose insert cannot be used, and the cost of using the insert increases.

In addition, when a general-purpose insert is used, the cutting speed and the feed speed are reduced more than necessary to reduce the cutting resistance, and cutting may not be performed efficiently.
In addition, since the cutting depth is large, the position of the insert is shifted due to cutting resistance, and there is a problem that cutting cannot be performed with high dimensional accuracy.

  Also, in castings such as tunnel segments, particularly large protruding portions such as burrs may occur locally. When using a general-purpose insert, burrs and the like cannot be cut. Burrs were removed by the work. For this reason, the surface cutting of the casting requires a great deal of labor and time.

In addition, in order to remove burrs and the like with only the cutting tool, it is necessary to use a large insert or to arrange the inserts in two rows so that the cutting edge of the insert is continuous in the tool axis direction on the rotation trajectory. There is.
However, when a large insert is used, there is a problem that the cost of using the insert becomes high.
Moreover, when the same insert is arranged in two rows, the space of the tool body is limited, so it is necessary to reduce the number of inserts located on the tip side, and the number of cutting blades that can be used for normal cutting is reduced. It will decrease. For this reason, there is a problem that it is necessary to reduce the cutting speed, and cutting cannot be performed efficiently.

Moreover, in the cutting tool provided with many inserts, each insert must be attached so that the rotation locus which the cutting blade of each insert draws around the axis line of a tool main body corresponds. That is, the cutting tool must have high cutting edge runout accuracy so that the amount of runout of the cutting edge is the same.
However, when cutting a large workpiece such as the above-described tunnel segment, a large cutting tool itself is used. Then, when adjusting the runout of the cutting blade with this cutting tool attached to a machine tool or the like, the workability is deteriorated and much labor and time are required, so that the position adjustment can be easily performed. A cutting tool was desired.

The present invention has been made in view of such circumstances, and even when the cutting depth is large, a general-purpose insert can be used without using a thick insert, and the cutting speed and feed speed can be increased more than necessary. It is a first object of the present invention to provide a cutting tool that can efficiently cut without lowering.
It is a second object of the present invention to provide a cutting tool capable of easily and accurately adjusting the position of the insert.
Furthermore, a third object is to provide a cutting tool capable of cutting using a general-purpose insert even when a large protruding burr or the like is generated on the surface of the workpiece.

  In order to solve this problem, the present invention has a tool body that is rotated around an axis, and an outer periphery of a tip portion of the tool body is opened toward the outer side in the radial direction of the tool body and toward the tip side of the tool body. A cutting tool in which a mounting seat for detachably mounting an insert having a cutting blade is formed, and the mounting seat is made of cemented carbide, A sheet member having a wall surface facing the outer side in the radial direction of the tool body and a wall surface facing the front side in the tool rotation direction formed so as to extend toward the tip end side of the tool body is disposed, and the tool rotation of the sheet member An insert having a cutting edge is seated on a wall surface facing the front side in the direction, and a side surface of the insert facing the tool body radial inner side is in contact with a wall surface of the seat member facing the tool body radial outer side Special It is set to.

In the cutting tool having this configuration, a sheet member made of cemented carbide and having a wall surface facing the tool body radial direction outer side and a wall surface facing the tool rotation direction front side is disposed, and an insert is seated on the sheet member. Therefore, the main component force of the cutting resistance when the workpiece is cut by the insert can be received by the wall surface facing the front side in the tool rotation direction of the insert and the sheet member.
Therefore, even when the cutting depth is large, it is not necessary to use a thick insert, and a general-purpose insert can be used, so that the cost of using this insert can be greatly reduced.

  In addition, since the side surface of the insert that faces the inner side of the tool body in the radial direction of the tool is in contact with the wall surface of the sheet member that faces the outer side of the tool body in the radial direction of the tool, Can be received with the wall facing outward. Therefore, since the position of the insert is stable even if the cutting resistance is large, there is no need to reduce the cutting speed and the feed speed more than necessary to reduce the cutting resistance, and the cutting can be performed efficiently and the dimensional accuracy can be reduced. It can cut well.

  Further, on the wall surface facing the tool rotation direction front side of the sheet member, the insert and a pressing member having a pressing surface abutted on a side surface facing the tool body rear end side of the insert in the axial direction. This adjustment is achieved by placing an adjustment screw for adjusting the position of the insert in the axial direction through the pressing member on the rear end side of the tool body of the pressing member while sitting in a column. By screwing the screw, the insert can be moved to the tip side of the tool body along the wall surface facing the front side in the tool rotation direction of the sheet member. Here, since the insert is pressed by a pressing member having a pressing surface that comes into contact with the surface of the insert facing the rear end side of the tool body, the insert does not rotate.

Therefore, the insert is moved toward the tip of the tool body while maintaining a constant angle between the cutting edge directed outward in the tool body radial direction and the axis, so-called corner angle, and the clearance angle of the flank of the insert. This makes it possible to easily adjust the runout of the cutting blade.
Furthermore, since a pressing member having a contact surface that is in contact with a side surface facing the rear end side of the tool body of the insert is disposed on the rear end side of the tool body of the insert, It can be received by the pressing member.

  Further, the wall surface of the sheet member facing the front side in the tool rotation direction of the sheet member that receives the main component force of the cutting force by making the thickness of the wall surface of the sheet member facing the front side in the tool rotation direction larger than the thickness of the insert. The thickness of the insert can be reliably ensured, and the position of the insert can be stabilized even when the cut amount is large.

  In addition, when the angle between the cutting edge and the axis line arranged so as to face the outer side in the radial direction of the tool body when viewed from the front side in the tool rotation direction is set to 15 ° or less, the back force of cutting resistance The load on the pressing member and the adjusting screw arranged on the rear end side of the tool body of the insert can be reduced, and the position of the insert in the axial direction can be stabilized.

  Further, the insert is a positive insert with a clearance angle. However, when the clearance angle is set to 15 ° or less, the insert may be broken even if the workpiece is made of cast iron, for example. It can cut without.

  Furthermore, a second mounting seat on which a second insert is mounted is formed on the tool body, the cutting blade formed on the second insert is a second cutting blade, and the second cutting blade is moved around the axis. In the rotation locus, the second insert provided with a particularly large projecting portion such as a burr by continuously arranging in the axial direction on the tool body rear end side of the cutting edge of the insert. It can be cut with a cutting blade. Therefore, the cutting amount in the insert can be suppressed to a certain level or less, and the cutting resistance can be reduced.

  Here, by performing normal planar processing with the cutting edge of the insert, and cutting only locally generated burrs with the second cutting edge of the second insert, wear of the second cutting edge can be suppressed. The replacement frequency of the second insert can be lowered.

Further, by arranging the second cutting edge on the outer side in the tool body radial direction with respect to the cutting edge of the insert, even if a large protruding portion such as a burr is locally generated, the second cutting edge is used. With the blade, the protruding portion can be cut and removed in advance, the amount of cutting by the cutting blade of the insert can be surely suppressed below a certain level, and the cutting resistance applied to the insert can be reduced. .
In addition, since the large protruding portion such as a burr is cut and removed in advance by the second cutting edge, it is not necessary to remove the burr and the like manually as in the conventional case, and the surface of the casting or the like can be easily cut. Can be done.

Further, the second insert is a polygonal flat plate having a pair of polygonal surfaces, and one of the polygonal surfaces is arranged so as to face the outer side in the radial direction of the tool body, thereby forming an outer peripheral flank. Use a so-called vertical blade insert in which the side facing the tip of the tool body is the tip flank and the side facing the front of the tool rotation direction is the rake, and a cutting edge is formed on the side ridge of the rake. Thus, even if the amount of cutting by the second cutting blade is large, it is possible to prevent the second insert from being damaged.
In addition, since the insert is a vertical blade, the portion of the tool body notched for mounting the second insert can be reduced, the rigidity of the tool body can be secured, and even in a small space, Two inserts can be installed.

Further, by arranging a plurality of second inserts having the same shape and size on the second mounting seat so as to be arranged in the axial direction, two corner portions of one polygonal surface of these second inserts are arranged. For example, after using two corners for a cutting tool rotated to the left, the two corners of the other polygonal surface can be used for a cutting tool rotated to the right, thus reducing the cost of using this second insert. Can be made.
Here, when cutting a tunnel segment, a left-turn cutting tool is placed on one end face and a right-turn cutting tool is placed on the other end face for cutting. It is preferable that the second inserts are arranged so as to be vertically arranged in the axial direction.

  Further, the second insert is formed in at least a part of a portion between the plurality of mounts arranged in the circumferential direction without reducing the number of the inserts. Can be attached. Therefore, it is not necessary to reduce the cutting speed and the feeding speed more than necessary, and the cutting with the cutting edge of the insert can be performed efficiently.

Therefore, according to the present invention, even when the cutting depth is large, a general-purpose insert can be used without using a thick insert, and cutting can be performed efficiently without reducing the cutting speed and feed rate more than necessary. A tool can be provided.
Moreover, the cutting tool which can perform the position adjustment of insert easily and accurately can be provided.
Furthermore, it is possible to provide a cutting tool capable of cutting using a general-purpose insert even when a large protruding burr or the like is generated on the surface of the workpiece.

Embodiments of the present invention will be described with reference to the accompanying drawings. 1 to 8 show a cutting tool according to an embodiment of the present invention.
The cutting tool 1 which is embodiment of this invention cuts the end surface of the tunnel segment comprised with cast iron.
As shown in FIGS. 1 and 2, the cutting tool 1 has a tool body 2 having a substantially disk shape. The tool body 2 includes a cutting blade member 3 having a ring shape, and the cutting blade member 3. It is comprised from the clamping member 4 which clamps and fixes.

The clamping member 4 includes a main body portion 4A in which an attachment hole 5 for attachment to a machine tool or the like is formed, a fixing member 4B that presses and fixes the ring-shaped cutting blade member 3 against the main body portion 4A, and the fixing member It is comprised with the fastening bolt 4C for pressing 4B to the main-body part 4A. Here, the side (left side in FIG. 2) on which the main body portion 4A is disposed is the rear end side of the tool body 2, and the side (left side in FIG. 2) on which the fixing member 4B is disposed is the front end side of the tool body 2. Yes.
The main body portion 4A is provided with a key member 6, and the fixing member 4B is formed with a key groove 7 in which the key member 5 is accommodated. Further, a plurality of projecting portions 8 projecting outward in the radial direction to form an arc shape are formed on the outer periphery of the fixing member 4B at equal intervals in the circumferential direction.

  On the inner peripheral surface of the ring-shaped cutting blade member 3, receiving portions 9 projecting radially inward and notches 10 recessed radially outward are alternately arranged in the circumferential direction. . Here, the outer diameter of the portion of the fixing member 4B where the protruding portion 8 is formed is smaller than the inner diameter of the portion of the cutting blade member 3 where the notched portion 10 is formed, and the receiving portion 9 is formed. It is made larger than the internal diameter of a part, and it is set as the structure by which the cutting blade member 3 is clamped by pressing the receiving part 9 with the said protrusion part 8. FIG. When the cutting blade member 3 is removed, the ring-shaped cutting blade member 3 is slightly rotated in a state where the tightening bolt 4C is loosened so that the cutout portion 10 is positioned at the protruding portion 8 of the fixing member 4B. To the fixed member side 4B.

  The outer peripheral surface of the cutting blade member 3 is formed in a tapered surface shape that gradually decreases in diameter as it goes toward the distal end side of the tool body 2, and the distal end side of the tool body 2 is on the distal end side of the tool body 2. And the 1st recessed part 11 opened toward the tool body 2 radial direction outer side is formed with two or more by the circumferential direction. A first mounting seat 12 is formed on the rear side of the first recess 11 in the tool rotation direction T. The first mounting seat 12 is recessed further inward in the tool body 2 radial direction than the first recess 11.

  As shown in FIGS. 3 and 4, a screw hole 13 extending substantially parallel to the outer peripheral surface of the cutting blade member 3 is formed on the surface of the first mounting seat 12 facing the distal end side of the tool body 2 from the body portion 4A. Is also formed so as to open to the rear end face of the outer peripheral cutting blade member 3. Further, as shown in FIG. 4, two clamp screws 14 extending toward the inner side in the tool body 2 radial direction are provided on the front side portion of the first mounting seat 12 facing the tool body 2 in the radial direction. Are screwed so as to be vertically arranged in the direction of the axis O.

  The first mounting seat 12 is provided with a sheet member 15 made of cemented carbide. The sheet member 15 has a wall surface 16 facing the front side of the tool rotation direction T extending toward the tip end side of the tool body 2 and a wall surface 17 facing the outer side in the radial direction of the tool body 2, and as shown in FIG. The main body 2 is generally L-shaped when viewed from the front end side. A wall surface 17 of the sheet member 15 facing the outer side of the tool body 2 in the radial direction is a contact surface that contacts a side surface of a first insert 18 to be described later, and as shown in FIG. The inclined surface is adapted to the shape.

  Further, as shown in FIG. 4, the wall surface 16 facing the front side of the tool rotation direction T of the sheet member 15 is an inclined surface that gradually recedes toward the rear side of the tool main body 2 as shown in FIG. 4. . The thickness of the wall surface 16 facing the front side of the tool rotation direction T is preferably set to be thicker than the thickness of the first insert 18 described later. In this embodiment, the thickness of the first insert 18 is 1 .2 times.

  Here, the 1st insert 18 has comprised the substantially square flat plate shape, and has the upper surface used as a rake face, the bottom face used as a seating surface, and four side surfaces. Cutting edges are formed on the side ridges on the upper surface, and the side surfaces connected to the cutting edges are flank surfaces. The first insert 18 is a positive insert with a clearance angle, and the clearance angle is set to 15 ° or less, and is set to 15 ° in this embodiment.

  The pressing member 19 has a rectangular flat plate shape that is substantially the same thickness as the first insert 18 and is made of a cemented carbide like the sheet member. A surface of the pressing member 19 facing the front end side of the tool body 2 is an inclined surface that comes into contact with a side surface of the first insert 18 facing the rear end side of the tool body 2. It is comprised so that the whole side surface which faces the rear-end side of the main body 2 can be pressed.

The first insert 18 and the pressing member 19 are seated on the wall surface 16 facing the front side in the tool rotation direction T of the seat member 15. An insert wedge material 20 and a press member wedge material 21 are mounted on the front side of the first insert 18 and the pressing member 19 in the tool rotation direction T by the clamp screw 14, respectively. Is inserted into the tool body 2 in the radial direction, whereby the first insert 18 and the pressing member 19 are pressed rearward in the tool rotation direction T. Therefore, as shown in FIGS. 4 and 5, the first insert 18 and the pressing member 19 include the surfaces 20 a, 21 a facing the tool rotation direction T of the wedge members 20, 21 and the tool rotation direction T of the sheet member 15. It is clamped by the wall surface 16 facing the front side.
An adjustment screw 22 is screwed into the screw hole 13, and the tip of the adjustment screw 22 is in contact with the surface of the pressing member 19 facing the rear end side of the tool body 2.

Thus, the 1st insert 18 is mounted | worn and the cutting edge of this 1st insert 18 is used as the 1st cutting edge 23, and it arrange | positions so that it may protrude in the tool main body 2 radial direction outer side and the tool main body 2 front end side. It will be.
Here, as viewed from the front side of the tool rotation direction T, the angle formed by the cutting edge directed to the outer side of the tool insert 2 in the radial direction of the first insert 18 and the axis O, the so-called corner angle, is set to be 15 ° or less. In this embodiment, the corner angle is set to 10 °.

  Furthermore, at least a part of the portions between the first recesses 11 adjacent to each other in the circumferential direction, for example, every other portion in the circumferential direction, is provided on the distal end side of the tool body 2 and on the radially outer side of the tool body 2 The 2nd recessed part 24 opened toward is formed. A second mounting seat 25 is formed on the rear side of the second recess 24 in the tool rotation direction T. The second mounting seat 25 is on the rear end side of the tool body 2 with respect to the first mounting seat 12 and the tool. The main body 2 is formed on the outer side in the radial direction. Two fixing screws 26 are screwed onto the wall surface of the second mounting seat 25 facing the outer side in the radial direction of the tool body 2 so as to be aligned in the axis O direction.

Two second inserts 27 having the same shape and the same size are mounted on the second mounting seat 25 so as to be aligned in the axis O direction.
The outer shape of the second insert 27 has a generally rhombic flat plate shape, and has a pair of rhombus surfaces and four side surfaces. A through hole 28 penetrating in the thickness direction is formed at the center of the rhomboid surface, and the fixing screw 26 is inserted into the through hole 28 and attached to the second mounting seat 25. .

  Here, the corner portion 29 intersecting the acute angle of the rhomboid surface is disposed on the tip end side of the tool body 2 and the front side in the tool rotation direction T and is used for cutting. One of the rhombus surfaces is directed outward in the radial direction of the tool body 2 to be an outer peripheral flank surface, a side surface facing the tip side of the tool body 2 is a front flank surface, and a side surface facing the tool rotation direction T front side is scooped. The cutting edge formed in the cross ridge line part of this outer periphery flank and front flank and rake face is made into the 2nd cutting edge 30, and this 2nd cutting edge 30 is the tool body 2 radial direction. It protrudes outward.

  The second cutting edge 30 is continuous in the direction of the axis O on the rear end side of the tool body 2 of the cutting edge of the first insert 18 which is the first cutting edge 23 in the rotation locus around the axis O, and The tool body 2 is arranged on the outer side in the radial direction of the tool body. In the present embodiment, the rear end side of the first cutting edge 23 is 7 mm from the tip side of the tool body 2 and the outer side of the first cutting edge 23 in the radial direction of the tool body 2. It is arranged 0.5 mm outside.

  The cutting tool 1 having such a configuration is attached to the spindle end of the machine tool using the attachment hole 5 of the main body portion 4A forming the tool main body 2, is rotated about the axis O, and intersects the axis O. A feed is given in the direction, and the surface of the material to be cut is cut and subjected to planar processing.

  According to the cutting tool 1 of the present embodiment, the first insert 18 is formed on the wall surface 16 facing the front side in the tool rotation direction T of the sheet member 15 made of the same highly rigid cemented carbide as the first insert 18. Since the thickness of the wall surface 16 that is seated and faces the front side in the tool rotation direction T is 1.2 times the thickness of the first insert 18 and thicker than the thickness of the first insert 18, The main component force of the cutting resistance when the workpiece is cut by the first cutting edge 23 provided in the first insert 18 is the wall surface 16 facing the front side in the tool rotation direction T of the first insert 18 and the sheet member 15. Can receive.

  Therefore, even when the cutting depth is large, it is not necessary to use an insert with a large plate thickness to ensure rigidity, a general-purpose insert can be used, and the first insert 18 is lost. Since it can prevent, the use cost of this 1st insert 18 can be reduced significantly.

Further, since the side surface of the first insert 18 facing the inner side of the tool body 2 in the radial direction of the first insert 18 is in contact with the wall surface 17 of the sheet member 15 facing the outer side of the tool body 2 in the radial direction, The tool body 2 can be received by the wall surface 17 facing the outside in the radial direction. Similarly, a pressing member 19 having a pressing surface 19a that is in contact with the side surface of the first insert 18 facing the rear end side of the tool body 2 is disposed on the rear end side of the tool body 2 of the first insert 18. The back component force of the cutting resistance can be received by the pressing member 19.
Therefore, since the position of the insert is stable even when the cutting resistance is large, it is not necessary to reduce the cutting speed and the feeding speed more than necessary, and the cutting can be performed efficiently.

  Further, a wall surface 17 of the sheet member 15 facing the outer side in the radial direction of the tool body 2 and a wall surface 16 facing the front side of the tool rotation direction T are formed to extend toward the tip side of the tool body 2, and this sheet member Since the first insert 18 and the pressing member 19 are arranged so as to be seated on the wall surface 16 facing the front side of the tool rotation direction, the adjustment screw 22 is arranged on the rear end side of the tool body 2 of the pressing member 19, By screwing the adjusting screw 22, the first insert 18 is moved along the wall surface 16 facing the front side in the tool rotation direction T of the sheet member 15, so that the clearance angle of the first cutting edge 23 is kept constant. Thus, the position of the first insert 18 can be adjusted.

Further, since the entire side surface of the first insert 18 facing the rear end side of the tool body 2 is pressed by the pressing surface 19a of the pressing member 19, the first insert 18 rotates on the wall surface 16 facing the front side in the tool rotation direction T. Therefore, the position of the first insert 18 can be adjusted while keeping the corner angle of the first cutting edge 23 constant.
Therefore, it is only necessary to adjust the position of the first insert 18 in the direction of the axis O with the adjusting screw 22, so that the swing adjustment of the first cutting edge 23 can be easily performed.

  Further, since the first insert 18 is a positive insert with a clearance angle and the clearance angle is 15 °, the first insert 18 can be cut by cutting force even when the material to be cut is made of cast iron. Can be prevented from being lost, and cutting resistance can be suppressed.

  Furthermore, since the angle formed by the first cutting edge 23 arranged so as to face the outer side of the tool body 2 in the radial direction and the axis O, the so-called corner angle, is 10 °, the back force of the cutting force can be suppressed. The load on the pressing member 19 and the adjusting screw 22 arranged on the rear end side of the tool body 2 of the first insert 18 can be reduced. Further, the position of the first insert 18 in the direction of the axis O is stabilized, and cutting can be performed with high dimensional accuracy.

  Further, the second cutting edge 30 is 7 mm rear end side from the tip end portion of the first cutting edge 23 and 0.5 mm outside the portion of the first cutting edge 23 in the radial direction of the tool body 2. Since it is arranged, even if there is a locally protruding portion on the surface of the material to be cut, after the portion protruding with the second cutting blade 30 is cut and removed, the cutting with the first cutting edge 23 is performed. be able to. Therefore, the cutting amount of the first cutting edge 23 can be suppressed to a certain amount or less, in this embodiment, 7 mm or less, and the cutting resistance applied to the first insert 18 can be reduced.

As described above, since the locally projecting portion of the surface of the workpiece such as burrs can be removed by the second cutting blade 30, the burrs produced by manual operations conventionally performed when cutting the surface of a casting or the like are performed. Therefore, the time and labor required for cutting the surface of a casting or the like can be greatly reduced.
Further, since the cutting resistance is suppressed, the cutting speed and the feeding speed are not decreased more than necessary, and the cutting process can be performed efficiently.

  Further, as the second insert 27, the outer shape is substantially a rhombic flat plate shape, one of the rhombus surfaces is an outer peripheral flank, and a side surface disposed so as to face the front end side of the tool body 2 is a front flank, and the tool rotation direction front Since a side face facing the rake face is used as a rake face, a so-called vertical blade insert in which a cutting edge is formed at the intersection ridge line portion of the rake face and the tip flank face and the outer peripheral flank face is used. Even if the amount of cut due to is large, this loss of the second insert 27 can be prevented.

  Further, since the second insert 27 is a vertical blade insert, it can be mounted so that the thickness direction of the insert and the radial direction of the tool body 2 coincide with each other. The portion that cuts out the main body 2 is reduced, and the rigidity of the tool main body 2 can be ensured, and the second insert 27 can be mounted even in a small space between the first concave portion 11 and the first concave portion 11. it can. Here, in the present embodiment, since the material to be cut is a tunnel segment made of cast iron, granular chips are generated, and the size of the first recess 11 and the second recess 24 is reduced. Is possible.

Further, by forming the second mounting seat 25 between the first recesses 11, the second cutting blades can be formed without reducing the number of the first recesses 11, that is, without reducing the number of the first cutting blades 23. 30 can be provided, so that it is not necessary to reduce the cutting speed and the feeding speed, and cutting can be performed efficiently.
Here, since the 2nd insert 27 will be used only when cutting the burr | flash etc. which generate | occur | produce locally, the cutting amount and usage frequency are few, and there are few numbers than the 1st insert 18. FIG. There is no problem.

  Further, two second inserts 27 having a substantially rhombic flat plate shape of the same shape and the same size are mounted on the second mounting seat 25 so as to be arranged in the direction of the axis O, and a corner intersecting the acute angle of the rhombus surface. Since the portion 29 is arranged at the tip end side of the tool body 2 and the front side of the tool rotation direction T and is used for cutting, the two corner portions 29 on one rhombus surface of these second inserts 27 are rotated, for example, counterclockwise After the cutting tool 1 is used, the two corners 29 of the other rhombus surface can be used for the cutting tool 1 rotated to the right, so that the cost of using the second insert 27 can be reduced.

As mentioned above, although the cutting tool which is embodiment of this invention was demonstrated, this invention is not limited to this, It can change suitably in the range which does not deviate from the technical idea of the invention.
For example, although the first insert has been described as a square plate-shaped positive insert, the present invention is not limited to this embodiment and may have other shapes.

  Although described as a cutting tool for cutting a casting made of cast iron, it can be applied as a cutting tool for cutting a material made of other materials. However, in the case of cutting a casting made of cast iron, granular chips are generated, so the first recess and the second recess can be made small, and the rigidity of the tool body can be ensured. It is preferable because it is possible.

It is a partial front view of the cutting tool which is embodiment of this invention. It is side surface fragmentary sectional view of the cutting tool which is embodiment of this invention. It is the figure which looked at the 1st attachment seat from the tool rotation direction front. It is the figure which looked at the 1st attachment seat from the tool main body radial direction outer side. It is the figure which looked at the 1st mounting seat from the tool body tip side. It is the figure which looked at the 2nd mounting seat from the tool rotation direction front. It is the figure which looked at the 2nd mounting seat from the tool main body radial direction outer side. It is the figure which looked at the 2nd mounting seat from the tool body tip side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cutting tool 2 Tool main body 11 1st recessed part (recessed part)
12 First mounting seat (mounting seat)
15 Sheet member 16 Wall surface 17 facing the front side in the tool rotation direction Wall surface 18 facing the tool body radial direction outer side First insert (insert)
19 Pressing member 22 Adjustment screw 23 Cutting blade (first cutting blade)
25 Second mounting seat 27 Second insert 30 Second cutting edge

Claims (10)

It has a tool body that rotates about an axis, and is provided with a recess that is open toward the outer side in the radial direction of the tool body and toward the tip side of the tool body on the outer periphery of the tool body. A cutting tool having a mounting seat for detachably mounting an insert having a cutting blade,
The mounting seat is made of cemented carbide and has a wall surface facing the tool body radial direction outer side and a wall surface facing the tool rotation direction front side, which is formed to extend toward the tip end side of the tool body. Is placed,
An insert having a cutting edge is seated on a wall surface of the sheet member facing the front side in the tool rotation direction, and a side surface of the insert facing the tool body radial inner side faces the tool body radial outer side of the sheet member A cutting tool, which is in contact with the cutting tool. On the wall surface facing the front side in the tool rotation direction of the sheet member, the insert and a pressing member having a pressing surface abutting on a side surface facing the tool body rear end side of the insert are vertically arranged in the axial direction. Is seated like
The adjusting screw for adjusting the position of the axial direction of the insert via the pressing member is disposed on the rear end side of the tool body of the pressing member. Cutting tools.   The cutting tool according to claim 1 or 2, wherein the thickness of the wall surface of the sheet member facing the front side in the tool rotation direction is made thicker than the thickness of the insert.   The angle formed by the cutting edge and the axis line arranged so as to face the outer side in the radial direction of the tool body when viewed from the front side in the tool rotation direction is 15 ° or less. 4. The cutting tool according to any one of 3.   The cutting tool according to any one of claims 1 to 4, wherein the insert is a positive insert with a clearance angle, and the clearance angle is 15 ° or less. The tool body is formed with a second mounting seat on which a second insert is mounted, and the cutting blade formed on the second insert is a second cutting blade,
The said 2nd cutting blade is continuously arrange | positioned in the said axial direction at the said tool body rear end side of the said cutting blade of the said insert in the rotation locus | trajectory around the said axis line. Item 6. The cutting tool according to any one of Items 5.   The cutting tool according to claim 6, wherein the second cutting edge is disposed on the outer side in the radial direction of the tool body with respect to the cutting edge of the insert.   The second insert has a polygonal flat plate shape having a pair of polygonal surfaces, and one of the polygonal surfaces is arranged so as to face the outside in the radial direction of the tool body, and is used as an outer peripheral flank. The side face facing the front end side of the main body is a tip flank face, and the side face facing the front side in the tool rotation direction is a rake face, and a cutting edge is formed at the cross ridge line portion of the rake face, the tip flank face, and the outer peripheral flank face. The cutting tool according to claim 6 or 7, wherein: is formed.   The cutting tool according to claim 8, wherein a plurality of the second inserts having the same shape and the same size are arranged on the second mounting seat so as to be arranged in a row in the axial direction.   The said 2nd mounting seat is formed in at least one part of the part between the said mounting seats arrange | positioned in multiple numbers by the circumferential direction, The any one of Claims 6-9 characterized by the above-mentioned. Cutting tools.

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