JP2006247776A - Milling cutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a milling cutter, easily adjusting the position of an insert while the cutting edge angle of a sub-cutting edge is kept constant to attain high run-out accuracy of the cutting edge. <P>SOLUTION: In this milling cutter 31, the insert 51 having a cutting edge is mounted on the outer periphery of the tip part of a disk-like tool body 32. At least a guide part extending in the axial direction of the tool body 32 is formed on a mounting seat 35, and on the other hand, a guided part to which the guide part is fitted to slide in the extending direction is formed on the seated surface of the insert 51. The tool body 32 is provided with a cutout part 38 opened to the wall surface intersecting the extending direction of the guide part. An adjusting piece 41 is inserted in the cutout part 38, an adjusting screw 46 is inserted in the inner peripheral part of the adjusting piece 41, and at least either the inner peripheral surface of the adjusting piece 41 or the adjusting screw 46 is provided with an enlarged diameter part gradually increasing in diameter as it goes toward the outside of the adjusting piece 41. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a milling cutter 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, a milling cutter equipped with a plurality of inserts is used as a turning tool for performing planar processing on a workpiece. In this type of milling cutter, inserts made of a hard material such as cemented carbide are detachably attached to a large number of chip pockets and mounting seats formed on the outer periphery of the tip of the disk-shaped tool body, The outer peripheral cutting edge (main cutting edge) facing the outer side of the tool body in the radial direction of the above insert and the tool body tip side by rotating the tool body at a high speed around its axis and feeding in the direction intersecting the axis The material to be cut is cut by the auxiliary cutting blade directed toward the surface.

  By the way, in the milling cutter provided with many inserts, each insert must be attached so that the rotation locus which the cutting edge of each insert draws around the axis line of a tool body corresponds. That is, the above-mentioned milling cutter must have high cutting edge runout accuracy so that the amount of runout of the cutting edge is the same. In the above-mentioned milling cutter, when the amount of swinging out of the cutting edge is different, the cutting blade having a large amount of swinging out wears preferentially. There was a problem that the finished surface of the film was wavy and the surface roughness deteriorated.

In the above-mentioned milling cutter, in order to improve the surface roughness of the finished surface, means for making a part of a large number of inserts mounted on the milling cutter a wiper blade (wiping blade) is provided. The milling cutter provided with the wiper blade has a problem that only the wiper blade is cut, and the wiper blade is worn preferentially, so that the frequency of replacement of the insert is increased.
Therefore, such a milling cutter has been proposed that includes an adjustment mechanism for adjusting the amount of swing of each cutting blade by moving the position of the insert in the tool body axial direction (Patent Document 1, Patent Document 2).

19 and 20 show an example of a milling cutter provided with an adjusting mechanism for adjusting the amount of swing of the conventional cutting blade.
The milling cutter 1 includes a disk-shaped tool body 2 that is rotated around an axis O and a plurality of inserts 3. A plurality of chip pockets 4 are formed on the outer periphery of the tip of the tool body 2, and a mounting seat 5 for the insert 3 is formed on the tip pocket 4 in the tool rotation direction T rear side.

  The insert 3 is mounted on the mounting surface 5A of the mounting seat 5 with one surface facing the thickness direction of the insert 3 as a seating surface. On the front side in the tool rotation direction T of the mounting seat 5, a recess is formed on the inner wall surface of the tip pocket 4 in the radial direction of the tool body 2, and the wedge member 6 is formed in the recess. It is inserted and fixed to the tool body 2 with a clamp screw 7. The insert 3 is pressed against the mounting seat 5 by the wedge member 6, and is sandwiched between the rear side wall surface 6 </ b> A of the wedge member 6 in the tool rotation direction T and the mounting surface 5 </ b> A of the mounting seat 5.

  Further, a female screw portion 8 is formed on the wall surface of the mounting seat 5 on the rear end side of the tool body 2, and the female screw portion 8 is in contact with the surface of the insert 3 facing the rear end side of the tool main body 2, An adjustment screw 9 for adjusting the position of the insert 3 in the direction of the axis O is screwed. The adjustment screw 9 is provided with a head portion 10, and a plurality of engagement holes 11 into which a dedicated tool for rotating the adjustment screw 9 is inserted are formed on the side wall of the head portion 10 at regular intervals. .

  The milling cutter 1 having the above-described configuration is configured such that the tool body 2 is rotated around the axis O at a high speed and sent in a direction intersecting the axis O, so that the tool of the insert 3 installed on the outer periphery of the tip end of the tool body 2 The material to be cut is cut by the outer peripheral cutting edge directed outward in the radial direction of the main body 2 and the auxiliary cutting edge directed toward the distal end side of the tool main body 2.

In the milling cutter 1 having the above configuration, the adjustment screw 9 screwed to the female screw portion 8 is rotated, and the surface of the insert 3 facing the rear end side of the tool body 2 is pressed by the head 10 of the adjustment screw 9. By adjusting the amount of swing of the cutting blade.
Japanese Patent Laid-Open No. 2001-252813 JP 2001-246515 A

  By the way, in the milling cutter 1 having the above configuration, since the moving direction of the insert 3 is not restricted, when the head 10 of the adjusting screw 9 is pressed against the surface of the insert 3 facing the rear end side of the tool body 2, There was a possibility that the insert 3 would shift in a direction other than the adjustment direction. In particular, when the insert 3 is rotated on the mounting surface 5A, the cutting angle of the auxiliary cutting edge provided at the corner of the insert 3 varies depending on each insert. was there. For this reason, it took a great deal of time and labor to adjust the amount of deflection of the cutting blade.

  Further, in the milling cutter 1 having the above-described configuration, the cutting edge runout accuracy depends on the experience and skill of the operator, and a satisfactory level cannot be stably supplied. In order to improve the surface roughness, it was necessary to attach a wiper blade. When the wiper blade is attached, an excessive load is applied to the wiper blade that exposes the cut surface, so that there is a problem that wear of the wiper blade progresses quickly and the frequency of replacement of the insert 3 increases.

  The present invention has been made in view of the above circumstances, and the position of the insert can be easily adjusted while keeping the cutting angle of the sub-cutting blade constant, and high cutting edge runout accuracy can be obtained. An object is to provide a milling cutter.

  In order to solve the above-mentioned problems, the present invention is provided with a mounting seat in a recess formed on the outer periphery of the tip of a disk-shaped tool body rotated about an axis, and an insert having a cutting edge is provided on the mounting seat. A milling cutter that is detachably mounted with its seating surface closely attached, and the mounting seat is formed with a guide portion that extends at least in the axial direction of the tool body, while the seating surface of the insert A guide portion that is slidably fitted in a direction in which the guide portion extends, and the tool body has a notch that opens in a wall surface that intersects the direction in which the guide portion of the mounting seat extends. And an adjustment piece for adjusting the position of the insert by pressing the side surface of the insert by elastic deformation is inserted into the notch, and the adjustment piece has a cylindrical shape A slit that is formed and extends along the axis of the cylindrical body is formed, and an adjustment screw having a male screw portion and a head having a larger diameter than the male screw portion is inserted through the inner peripheral portion of the cylindrical body. The male screw portion is screwed to the bottom surface of the cutout portion, and the head is brought into contact with the inner peripheral surface of the adjustment piece, and the inner peripheral surface of the adjustment piece or the head of the adjustment screw At least one of the portions is provided with a diameter-expanded portion whose diameter gradually increases toward the outside of the adjustment piece.

  In the milling cutter having the above-described configuration, a cylindrical adjustment piece is inserted into a notch provided in the wall surface that intersects with the direction in which the guide portion extends, and the adjustment piece forms an inner peripheral portion of the cylinder. Since the adjustment screw is inserted and the male screw part of the adjustment screw is screwed to the bottom of the notch, the adjustment screw head is positioned inside the adjustment piece by inserting this adjustment screw. The insert that is elastically deformed and attached to the mounting seat is pressed so that the adjustment piece it has is pushed and spread. Further, by loosening the adjustment screw, the head of the adjustment screw is positioned outside the adjustment piece, and the adjustment piece that has been spread out elastically returns to weaken the pressing force that presses the insert.

When the insert is pressed, the insert is moved along at least the axial direction of the tool body formed on the mounting seat, that is, along the guide portion extending in a direction not perpendicular to the axis, so that the insert rotates on the mounting surface. Without shifting in a direction other than the adjustment direction, and the labor and time required for adjusting the amount of deflection of the cutting blade can be reduced. Further, since the amount of swinging out of the insert can be adjusted so as to advance and retreat by screwing or loosening the adjusting screw, the position of the insert can be adjusted easily and accurately.
Also, since the adjustment screw is elastically deformed and pressed so that the adjustment screw itself can be tightened, the adjustment screw is prevented from loosening even when this milling cutter is rotated at high speed, and the runout accuracy of the cutting blade is maintained. The insert can be firmly fixed as it is.

  Further, the insert is formed in a polygonal flat plate shape, and a main cutting edge that forms an outer peripheral cutting edge when the insert is mounted on the mounting seat is provided at a side edge of the polygon. A sub-cutting blade that is inclined inwardly with respect to the main cutting edge and is positioned on a plane that is substantially perpendicular to the axis is provided on the distal end side of the main body, and the guide portion and the guided portion are the main cutting edges. By forming the insert so as to extend in parallel with the cutting edge, the sub-cutting edge is disposed substantially parallel to a horizontal plane perpendicular to the axis of the tool body when the insert is mounted on the mounting seat. In this state, when the adjustment screw is screwed in, the adjustment piece elastically deforms and presses the surface of the insert facing the rear end side of the tool body, and extends in a direction parallel to the main cutting edge and in the axial direction of the tool body. Thus, the insert is moved along the guide portion provided in the mounting seat.

Therefore, in the above-mentioned milling cutter, the position of the insert is adjusted while the sub-cutting blade is arranged substantially parallel to the horizontal plane perpendicular to the axis of the tool body. The surface roughness of the finished surface is improved and there is no need to provide a separate wiper blade. Further, since only the position of the insert in the tool body axial direction needs to be adjusted by adjusting the screwing amount of the adjusting screw, the labor and time required for adjusting the amount of swing of the cutting blade can be greatly reduced.
In addition, since the feed force acting on the inside of the tool body from the main cutting edge to the insert in the radial direction of the tool body can be received by the fitting of the guide part and the guided part, the mounting rigidity is improved and the cutting force during cutting improves the insert. It can prevent shifting.

  In addition, by providing the notch portion on the rear end side of the tool body of the mounting seat so as to open to a surface facing the outer side in the tool body radial direction, the end surface of the adjustment screw faces the outer side in the tool body radial direction. Because it is exposed, the work tool does not interfere with the tool body, etc., when rotating the adjustment screw, and the adjustment screw can be rotated more easily. Adjustments can be made.

  Further, the notch portion is provided on the rear end side of the tool body of the mounting seat so as to open to a surface facing the front side in the rotational direction of the tool body, so that it can be viewed from a position facing the rake face of the insert. Since the adjustment screw is rotated and can be adjusted while confirming the position of the insert in the axial direction of the tool body, the amount of swing of the cutting blade can be adjusted more easily and accurately.

  Further, the insert is formed in a polygonal flat plate shape, and a cutting edge is provided on each side ridge portion of the polygon, and a seating surface that comes into contact with the mounting seat when mounted on the tool body is formed on the seating surface. A plurality of convex portions are formed by providing a plurality of serration grooves of the same shape and the same size extending in at least two directions intersecting each other when viewed from the opposite side, and the serration grooves extending in at least two directions. One is selectively used as the guided portion, and the guide portion is a protruding portion into which the serration groove can be fitted. Position adjustment can be performed. In addition, since the insert is provided with a plurality of serration grooves of the same shape and the same size extending in at least two directions on the seating surface, the main cutting edge and the auxiliary blade formed on each side ridge portion of the polygon are provided. Even when the cutting blade is used with the corner changed, the serration groove and the protrusion can be fitted, and the position of the insert can be easily adjusted.

  Therefore, according to the present invention, it is possible to provide a milling cutter capable of easily adjusting the position of the insert while maintaining the cutting angle of the auxiliary cutting blade constant and obtaining high cutting blade deflection accuracy. Further, according to the present invention, the amount of deflection of the cutting blade can be adjusted with high accuracy, and the position of the insert can be adjusted while keeping the cutting angle of the auxiliary cutting blade constant, so that the milling cutter according to the present invention The surface roughness of the finished surface formed when the workpiece is cut with is good, and it is not necessary to separately provide a wiper blade.

A first embodiment of the present invention will be described with reference to the accompanying drawings.
1 to 5 show a milling cutter 31 according to a first embodiment of the present invention. FIGS. 6 to 8 show an adjustment piece 41 used in the present embodiment, and FIGS. 9 to 12 show an insert 51.
The milling cutter 31 has a tool body 32 that is made of a steel material and has a disk shape, and an insert 51 having a cutting edge is disposed on the outer periphery on the tip side of the tool body 32.

  An attachment hole 33 for attaching the tool body 32 to the spindle end of the machine tool or the like via an adapter is formed along the axis O of the tool body 32 at the center of the disk formed by the tool body 32. A plurality of tip pockets 34 are formed on the outer peripheral surface of the tool main body 32 so as to open to the outer peripheral surface and the front end surface of the tool main body 32, and the tool rotation direction T of these chip pockets 34 is further increased. A mounting seat 35 is provided on each rear side.

  The mounting surface 35A of the mounting seat 35 is slightly inclined so as to go to the front side of the tool rotation direction T as it goes to the tip end side of the tool body 32, and on this mounting surface 35A, a guide that regulates the moving direction of the insert 51. The protrusions 36 are formed at equal pitches with a V-shaped cross section. This protrusion 36 is provided along the adjustment direction X of the insert 51 shown in FIGS. 1 and 2. In the present embodiment, the tip end side of the tool body 32 is the diameter of the tool body 32 with respect to the axis O direction. It is provided in a direction inclined by 15 ° toward the inner side. A clamp screw 37 for attaching the insert 51 is screwed to the attachment surface 35A in a direction perpendicular to the attachment surface 35A.

  On the rear end side of the tool main body 32 of each mounting seat 35, a notch portion 38 is provided in which the tool main body 32 is notched so as to open outward in the radial direction of the tool main body 32. The cutout 38 has an oval cross section, and a side edge on the side of the mounting seat 35 is opened toward the mounting seat 35. A screw hole extending inward in the radial direction of the tool body 32 is formed on the bottom surface of the notch 38 facing the outer periphery of the tool body 32.

The adjustment piece 41 inserted into the notch 38 has a cylindrical shape having an outer shape that can be inserted into an oval cross section formed by the notch 38, and the surface facing the mounting seat 35 is a flat surface. The surface is a pressing portion 42. The inner surface of the cylindrical body formed by the adjustment piece 41 has a circular cross section, and the portion located on the opposite side (upper side in FIGS. 7 and 8) to the insertion direction into the notch 38 is the large diameter portion 43. On the insertion direction side of the large-diameter portion 43, a diameter-expanded portion 44 whose diameter is gradually increased toward the side opposite to the insertion direction of the adjustment piece 41 (in the present embodiment, the radially outer side of the tool body 32) is formed. ing. Further, the insertion direction side of the enlarged diameter portion 44 is a small diameter portion that is coaxial with the large diameter portion 43 and has a small inner diameter, and penetrates the adjustment piece 41. The central axis of the large diameter portion 43 is parallel to the pressing portion 42.
The adjustment piece 41 includes a slit 45 extending in parallel with the pressing portion 42 and along the central axis of the circular cross section of the large diameter portion 43, from the large diameter portion 43 side to the middle of the small diameter portion. 42 is formed in the range provided.

  An adjustment screw 46 is inserted into the adjustment piece 41 so as to penetrate the large diameter portion 43 and the enlarged diameter portion 44. The adjustment screw 46 has a male screw portion 46A on the front end side and a head portion 46B having a larger diameter on the rear end side than the male screw portion 46A, and between the male screw portion 46A and the head portion 46B. A tapered portion 46 </ b> C whose diameter gradually increases toward the rear end side of the adjusting screw 46 is formed. Then, the adjustment piece 41 is inserted into the cutout portion 38, the adjustment screw 46 is inserted into the inner peripheral portion of the adjustment piece 41, and the male screw portion 46A is the bottom surface of the cutout portion 38 facing the outer peripheral side of the tool body 32 in this embodiment. The tapered portion 46 </ b> C and the enlarged diameter portion 44 of the adjustment piece 41 are disposed so as to be able to contact each other by being screwed into the screw hole formed in the inner surface of the adjustment piece 41.

  The insert 51 attached to the attachment seat 35 is made of a hard material such as a cemented carbide, is formed in a square flat plate shape as shown in FIG. 9 in plan view, and is a flat upper surface portion 52 that forms a rake face. And a bottom surface portion 53 forming a seating surface and four side surface portions forming flank surfaces. The four side surface portions are formed so as to gradually spread outward from the bottom surface portion 53 toward the upper surface portion 52, and the insert 51 is formed in an isosceles trapezoidal shape as viewed from the side surface as shown in FIGS. The positive insert has a side surface with a clearance angle.

Main cutting edges 54 are provided on four side ridges formed by intersecting ridge lines of the upper surface 52 and the four side surfaces, and each main corner 52 of the upper surface 52 is provided with a chamfer portion from one main cutting edge 54. An auxiliary cutting edge 56 is provided which is connected to the main cutting edge 54 and is inclined inward (75 ° in this embodiment) with respect to the main cutting edge 54.
Further, an insertion hole 57 through which a clamp screw 37 for attaching the insert 51 to the attachment seat 35 is inserted is provided at the center of the upper surface portion 52 of the insert 51 so as to extend in a direction perpendicular to the upper surface portion 52. The insert 51 is formed so as to be 90 ° rotationally symmetric with respect to the center line of the insertion hole 57.

  The bottom portion 53 has the same extending in parallel to each other in a direction perpendicular to the main cutting edge 54 provided on each side ridge portion of the square formed by the insert 51 when the insert 51 is viewed from the bottom portion 53 side. Serrated grooves 58 having a V-shaped cross section of the same size are provided at an equal pitch. In the present embodiment, since the insert 51 is formed in a square flat plate shape, the serration grooves 58 are provided in two directions orthogonal to each other, and the two orthogonal serration grooves 58 are also identical in shape. It is large and formed at an equal pitch. Therefore, the bottom surface 53 is formed with a plurality of convex quadrilateral pyramidal projections 59 having the same shape and the same size by serration grooves 58 formed in the two directions. The projection 59 is formed in the shape of a regular quadrangular pyramid.

  A protrusion 36 formed on the mounting surface 35A of the mounting seat 35 in a direction in which the distal end side of the tool body 32 is inclined inward in the radial direction of the tool body 32 with respect to the direction of the axis O (15 ° in this embodiment), and an insert When the insert 51 is mounted on the mounting seat 35 so that the serration groove 58 formed in the direction orthogonal to the main cutting edge 54 is fitted to the bottom surface portion 53 of the 51, the insert 51 is mounted on the mounting seat. The main cutting edge 54A positioned on the outer side in the radial direction of the tool body 32 when mounted on the tool body 35 is disposed so as to be inclined by 15 ° with respect to the axis O, and is connected to the main cutting edge 54A via the chamfer portion 55. The sub cutting edge 56A is positioned substantially parallel to the horizontal plane orthogonal to the axis O.

  Then, the clamp screw 37 is inserted into the insertion hole 57 of the insert 51 and screwed to the mounting seat 35, and the insert 51 is fixed to the mounting seat 35. Here, the insert 51 is arranged so that the surface 51 </ b> A of the insert 51 facing the rear end side of the tool body 32 and the pressing portion 42 of the adjustment piece 41 inserted into the notch 38 abut.

  In the milling cutter 31 configured as described above, the mounting bolt is inserted into the mounting hole 33 of the tool body 32 and the tip of the mounting bolt is screwed into the adapter, whereby the tool body 32 is connected to the adapter. The tool 51 is attached to the spindle end of the machine tool via an adapter, rotated at a high speed in the tool rotation direction T around the axis O, and fed in a direction intersecting the axis O, whereby the diameter of the tool body 32 of the insert 51 is increased. The workpiece is cut by the outer peripheral cutting edge (main cutting edge 54A) directed outward in the direction and the auxiliary cutting edge 56A directed toward the distal end side of the tool body 32.

In the milling cutter 31 configured as described above, the position of the insert 51 is adjusted by screwing or loosening the adjusting screw 46.
When the adjustment screw 46 is screwed in, the taper portion 46C of the adjustment screw 46 that is in contact with the enlarged-diameter portion 44 of the adjustment piece 41 presses the enlarged-diameter portion 44 and uses the end point of the slit 45 as a fulcrum. The pressing portion 42 presses the surface 51A of the insert 51 facing the rear end side of the tool body 32, and the insert 51 is formed on the mounting surface 35A of the mounting seat 35. Along the tip of the tool body 32. On the other hand, when the adjustment screw 46 is loosened, the adjustment piece 41 that has been elastically deformed so as to be expanded is elastically restored, and the force for pressing the surface 51A of the insert 51 facing the rear end side of the tool body 32 is reduced. The insert 51 is retracted toward the rear end side of the tool body 32.

  Thus, since the insert 51 is moved along the protrusion 36 formed on the mounting surface 35A of the mounting seat 35, the insert 51 is not displaced in a direction other than the adjustment direction X of the insert 51, so The amount of deflection of the cutting blade can be adjusted while keeping the cutting angle of the cutting blade 56A constant. Further, since it is only necessary to adjust the position of the insert 51 in the direction of the axis O, the labor and time required for adjusting the amount of deflection of the cutting blade can be greatly reduced.

Further, since the position of the insert 51 in the direction of the axis O can be adjusted so as to advance and retreat, the amount of swing of the cutting blade can be easily adjusted.
In addition, since the adjustment piece 41 is elastically deformed to press the insert 51 and the adjustment screw 46 itself is also pressed, the adjustment screw 46 may be loosened when the milling cutter 31 is rotated at a high speed. Thus, the insert 51 can be firmly fixed while reliably maintaining the amount of swing of the cutting edge.

  Further, since the protruding portion 36 and the serration groove 58 are parallel to the main cutting edge 54A forming the outer peripheral cutting edge, the feed force acting on the insert 51 in the radial direction from the outer peripheral cutting edge (main cutting edge 54A) to the insert 51. Can be received by fitting the protruding portion 36 and the serration groove 58, the mounting rigidity can be improved, and the insert 51 can be prevented from shifting due to the cutting resistance during cutting.

In addition, the amount of deflection of the cutting blade can be adjusted with high accuracy, and the position of the insert 51 can be adjusted while keeping the cutting angle of the auxiliary cutting blade 56A constant, so that the milling cutter 31 cuts the workpiece. The surface roughness of the finished surface formed at this time is good, and it is not necessary to separately provide a wiper blade (wiping blade), and the replacement frequency of the insert 51 can be reduced.
Further, since the notch 38 is opened toward the radially outer side of the tool main body 32, the head 46B of the adjustment screw 46 is exposed to the outer peripheral surface of the tool main body 32, and when the adjustment screw 46 is rotated, a working tool, etc. Does not interfere with the tool body 32 and the like, and the adjustment screw 46 can be rotated easily.

Next, in the second embodiment of the present invention, portions common to the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only differences are described.
The milling cutter 61 which is 2nd embodiment of this invention is shown to FIGS. 13-15, and the adjustment piece 71 is shown to FIGS.
In the milling cutter 61 according to the second embodiment, a notch portion in which the tool body 32 is notched so as to open toward the front side in the tool rotation direction T on the rear end side of the tool body 32 of each mounting seat 35. 68 is provided. The notch 68 is formed in an oval cross section, and the side edge on the side of the mounting seat 35 is opened toward the mounting seat 35. In the present embodiment, a screw hole into which the male screw portion 46A of the adjustment screw 46 is screwed is formed on the bottom surface of the notch portion 68 facing the front side in the tool rotation direction T.

  The adjustment piece 71 has a cylindrical shape having an outer shape that can be inserted into an oval cross section formed by the cutout portion 38, and a surface facing the mounting seat 35 is a flat surface, and this flat surface is a pressing portion 72. Yes. The surface located on the side opposite to the insertion direction of the adjustment piece 71 into the cutout portion 38 (the upper side in FIGS. 17 and 18) is an inclined surface that retreats toward the pressing portion 72.

  In the milling cutter 61 having the above-described configuration, the same effects as those of the first embodiment can be obtained, and the notch 68 is provided so as to open toward the front side in the tool rotation direction T. Since the adjustment screw 46 is rotated from a position facing the rake face (upper surface portion 52), the position of the insert 51 in the direction of the axis O can be easily confirmed, and the adjustment of the swing amount of the cutting blade can be performed more easily and It can be performed with high accuracy.

  In the milling cutters 31 and 61 having the above-described configuration, serration grooves 58 that can be fitted into the protrusions 36 formed on the mounting seats 35 of the milling cutters 31 and 61 are formed in the insert 51 in two directions. By doing so, since the plurality of convex portions 59 are formed on the bottom surface portion 53 that forms the seating surface, the insert 51 can be firmly fixed to the mounting seat 35 by the wedge effect, and the mounting rigidity is increased and cutting is performed. It can prevent that insert 51 shifts by cutting resistance at the time. In addition, since the serrated grooves 58 having the same shape and the same size extend in two directions intersecting each other, the same mounting rigidity is maintained even when the insert 51 is remounted between these two directions, such as during a corner change. Can do.

  In addition, since the serration groove 58 is provided in the insert 51 in a direction perpendicular to the side of the square, the corner of the insert 51 is changed, and the four main cutting edges 54 of the insert 51 are sequentially used as outer peripheral cutting edges. In addition, the serration groove 58 can be fitted into the protrusion 36 provided on the mounting seat 35 of the milling cutters 31, 61, and the position of the insert 51 can be adjusted easily.

  In the above embodiment, the guide portion formed on the mounting seat of the milling cutter has been described as a ridge portion having a V-shaped cross section. However, a cross-sectional wave shape in which a concave curve and a convex curve are continuously formed. Or a saw-tooth groove. Also, the serration groove of the insert may be a cross-sectional wave type groove constituted by a continuous concave curve and a convex curve, or may be a sawtooth groove, similarly to the guide portion described above. good.

  Moreover, although the milling cutter which fixes an insert with a clamp screw was demonstrated, an insert may be clamped between a tool main body with a wedge member, and may be fixed. Even in this case, the insert is firmly fixed by fitting the serration groove of the insert and the protrusion of the mounting seat, so that the insert is prevented from moving due to cutting resistance during cutting. it can.

  Further, the adjustment piece has an enlarged diameter portion on the inner peripheral surface and the adjustment screw has a tapered portion, and the explanation has been made with the arrangement in which the enlarged diameter portion and the tapered portion are slid. There is an enlarged diameter part on the inner peripheral surface and the adjustment screw is composed of a male screw part and a head, or the adjustment piece is not provided with an enlarged diameter part that gradually increases in diameter, for example, a large diameter part and a small diameter part And a taper portion may be provided on the adjusting screw.

Further, although the insert has been described as a square flat plate, it may be a polygon when viewed from the top. For example, in the case of a triangular insert, a triangular pyramid-shaped convex portion is formed on its seating surface, If the convex portion formed on the surface is formed in a conical shape, it can be attached to the ridge portion of the mounting seat without being limited to the shape of the insert, and the same effect as the above embodiment Can be obtained.
Moreover, although the material of insert was demonstrated as a cemented carbide alloy, it is not restrict | limited to the material of insert. Moreover, although described as a positive insert with a clearance angle, a negative insert without a clearance angle may be used.

It is a side view of the insert attachment part of the milling cutter which is 1st embodiment of this invention. It is a front view of the insert attachment part of the milling cutter which is 1st embodiment of this invention. It is a bottom view of the insert attachment part of the milling cutter which is 1st embodiment of this invention. It is side surface sectional drawing of the milling cutter which is 1st embodiment of this invention. It is a bottom view of the milling cutter which is the first embodiment of the present invention. It is a top view of the adjustment piece used in 1st embodiment of this invention. It is the side view which looked at the adjustment piece of FIG. 6 from the A direction. It is the side view which looked at the adjustment piece of FIG. 6 from the B direction. It is a top view of the insert used for the embodiment of the present invention. FIG. 10 is a bottom view of the insert of FIG. 9. It is the side view which looked at the insert of Drawing 9 from the A direction. It is the side view which looked at the insert of Drawing 9 from the B direction. It is a side view of the insert attachment part of the milling cutter which is 2nd embodiment of this invention. It is a bottom view of the insert attachment part of the milling cutter which is 2nd embodiment of this invention. It is side surface sectional drawing of the milling cutter which is 2nd embodiment of this invention. It is a top view of the adjustment piece used in 2nd embodiment of this invention. It is the side view which looked at the adjustment piece of FIG. 16 from the A direction. It is the side view which looked at the adjustment piece of FIG. 16 from the B direction. It is detail drawing of the insert attachment part of the conventional milling cutter. It is side surface sectional drawing of the conventional milling cutter.

Explanation of symbols

31, 61 Milling cutter 32 Tool body 34 Chip pocket (recess)
35 Mounting Seat 36 Projection (Guide)
38, 68 Notch part 41, 71 Adjustment piece 44 Diameter expansion part 45 Slit 46 Adjustment screw 46A Male thread part 46B Head part 46C Taper part (diameter expansion part)
51 Insert 53 Bottom (sitting surface)
54 Main cutting edge (cutting edge)
56 Sub cutting edge 58 Serration groove (guided part)
59 Convex

Claims (5)

A mounting seat is provided in a recess formed on the outer periphery of the tip of the disk-shaped tool body that rotates about the axis, and an insert having a cutting edge is attached to the mounting seat in a detachable manner with its seating surface in close contact. A milling cutter
A guide portion that extends at least in the axial direction of the tool main body is formed on the mounting seat, and a guided portion that is slidably fitted in the seating surface of the insert in a direction in which the guide portion extends. Part is formed,
The tool body is provided with a notch that opens on a wall surface that intersects with the direction in which the guide portion of the mounting seat extends, and the insert is elastically deformed to press the side surface of the insert. An adjustment piece is inserted to adjust the position of
The adjustment piece is formed in a cylindrical shape, is formed with a slit extending along the axis of the cylindrical body, and has a male screw portion and a diameter larger than that of the male screw portion in the inner peripheral portion of the cylindrical body. An adjustment screw having a head is inserted, the male screw portion is screwed to the bottom surface of the notch, and the head is brought into contact with the inner peripheral surface of the adjustment piece. A milling cutter characterized in that a diameter-expanding portion whose diameter gradually increases toward the outside of the adjustment piece is provided on at least one of the peripheral surface or the head of the adjustment screw.   The insert is formed in a polygonal flat plate shape, and a main cutting edge that forms an outer peripheral cutting edge when the insert is mounted on the mounting seat is provided on a side ridge portion of the polygon. A secondary cutting edge that is inclined inward with respect to the main cutting edge and is positioned on a plane that is substantially perpendicular to the axis is provided on the front end side of the tool body, and the guide portion and the guided portion are provided on the outer peripheral cutting edge. The milling cutter according to claim 1, wherein the milling cutter is formed so as to extend in parallel with a main cutting edge forming the blade.   3. The milling cutter according to claim 1, wherein the notch portion is provided on the rear end side of the tool body of the mounting seat so as to be opened in a surface facing the outer side in the tool body radial direction. .   The said notch part was provided in the surface which faces the rotation direction front side of the said tool main body at the said tool body rear end side of the said mounting seat, It provided, The Claim 1 or Claim 2 characterized by the above-mentioned. Milling cutter. The insert has a polygonal flat plate shape, a cutting edge is provided on each side ridge portion of the polygon, and the seating surface that comes into contact with the mounting seat when the tool is mounted on the tool body, A plurality of convex portions are formed by providing a plurality of serrated grooves of the same shape and the same size extending in at least two directions intersecting each other when viewed from the side facing the seating surface,
One of the serration grooves extending in at least two directions is selectively used as the guided portion, and the guide portion is a protruding portion into which the serration groove can be fitted. The milling cutter according to any one of claims 1 to 4.

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