JP2006150491A - Milling cutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a milling cutter capable of easily carrying out positional adjustment of an insert while keeping a cutting angle of an auxiliary cutting blade constant and providing high cutting edge deflecting precision. <P>SOLUTION: A mounting seat is furnished on a recessed part 42 formed in an outer periphery of a head end part of a roughly disc type tool main body 32 to be rotated around an axis and the insert 33 having the cutting edge in detachably installed on the mounting seat by adhering its seating surface on it on the milling cutter, at least a guide part 44 extending toward the axial direction of the tool main body 32 is formed on the mounting seat, a guided part 56 to slidably fit in a direction where the guide part 44 extends is formed on the seating surface of the insert 33, a cutout part 45 to open to a wall surface crossing with the direction where the guide part 44 of the mounting seat extends is provided on the tool main body 32 and an adjusting wedge 34 to adjust the position of the insert 33 by pressurizing a side surface of the insert 33 is inserted into the cutout part 45. <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 face 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 face 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, By rotating the tool body around its axis at high speed and feeding it in a direction crossing the axis, the outer cutting edge directed to the tool outer peripheral side of the insert and the front cutting edge directed to the tool tip side The material to be cut is cut by.

  By the way, in the face 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 O of the tool body matches. That is, the above face 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 face milling cutter, when the amount of runout of the cutting edge is different, the cutting blade with a large amount of runout wears preferentially, so that the frequency of replacement of the insert increases and the workpiece is cut. There was a problem that the finished surface of the material was wavy and the surface roughness deteriorated.

In the above face milling cutter, in order to improve the surface roughness of the finished surface, a means is provided in which a part of a large number of inserts attached to the face milling cutter is a wiper blade. However, the milling cutter provided with the wiper blade has a problem that only the wiper blade cuts many parts, and the wiper blade is worn preferentially, so that the frequency of replacement of the insert is increased.
In view of this, such a face milling cutter has been proposed that includes an adjustment mechanism for moving the position of the insert in the tool axis direction and adjusting the amount of swing of each cutting edge (Patent Document 1,). Patent Document 2).

FIG. 13 and FIG. 14 show an example of a face milling cutter provided with an adjustment mechanism for adjusting the amount of swing of a conventional cutting blade.
The face milling cutter 1 includes a substantially disc-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 rear side of the chip pocket 4 in the tool rotation direction T.

  The insert 3 is mounted on the mounting surface 5A of the mounting seat 5 with one end surface facing the thickness direction of the insert 3 as a seating surface. In the front of the mounting seat 5 in the tool rotation direction T, a concave portion is formed on the inner wall surface of the tool body 2 in the radial direction of the tool pocket 2, and the wedge member 6 is formed in the concave portion. Is inserted and fixed to the tool body 2 with the mounting 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 on the tool base end side of the mounting seat 5, and the female screw portion 8 is in contact with the surface of the insert 3 facing the tool base end side, so that the tool of the insert 3 An adjusting screw 9 for adjusting the position in the axial direction is screwed. The adjustment screw 9 is provided with a head 10, and a plurality of lateral holes 11 into which a dedicated tool for rotating the adjustment screw 9 is inserted are formed on the side wall of the head 10 at regular intervals.

  The front milling cutter 1 having the above-described configuration is 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 insert 3 installed on the outer periphery of the tip end of the tool body 2 is The workpiece is cut by the outer peripheral cutting edge directed toward the tool outer peripheral side and the front cutting edge directed toward the tool distal end side.

In the front milling cutter 1 having the above-described configuration, when adjusting the swing amount of the cutting blade, the adjustment screw 9 screwed to the female screw portion 8 is rotated to face the tool proximal end side of the insert 3. Is pressed by the head 10 of the adjusting screw 9 to cause the insert 3 to protrude toward the tip of the tool, thereby adjusting the position of the insert 3 in the tool axis direction.
Japanese Patent Laid-Open No. 2001-252813 JP 2001-246515 A

  By the way, in the front milling cutter 1 having the above configuration, since the moving direction of the insert 3 is not restricted, when the head 10 of the adjustment screw 9 presses the surface of the insert 3 facing the tool base end, 3 may be displaced 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 face 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 provides an insert having a mounting seat in a recess formed on the outer periphery of the tip of a substantially disk-shaped tool body rotated about an axis, and an insert having a cutting edge in the mounting seat. A milling cutter that is detachably mounted with its seating surface in close contact, wherein the mounting seat is formed with a guide portion extending at least in the axial direction of the tool body, and on the seating surface of the insert Is formed with a guided portion that is slidably fitted in the direction in which the guide portion extends, and the tool body has a notch portion that opens in a wall surface that intersects with the direction in which the guide portion of the mounting seat extends. And an adjustment wedge for pressing the side surface of the insert to adjust the position of the insert is inserted into the notch.

  In the milling cutter having the above-described configuration, the adjustment wedge is inserted into the tool body into the notch provided in the wall surface that intersects with the direction in which the guide portion extends, and is attached to the mounting seat. Since the insert is pressed by the adjustment wedge and the insert is pushed out, the insert is moved toward 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. Does not rotate on the mounting surface or shift in a direction other than the adjustment direction, and the labor and time required for adjusting the amount of swing of the cutting edge can be reduced. Further, by adjusting the shape of the adjustment wedge, the amount of movement of the insert relative to the amount of insertion of the adjustment wedge toward the inside of the tool body can be reduced, so that the position adjustment of the insert can be performed with high accuracy. Furthermore, since the insert is pressed by the wedge, the contact area between the insert and the wedge can be secured, and the mounting stability of the insert can be maintained.

  Further, the insert is formed in a substantially polygonal flat plate shape, and a main cutting edge that forms an outer peripheral cutting edge when the insert is attached to the mounting seat is provided on the side ridge portion of the polygon. On the tool front end side of the main cutting edge, a sub cutting edge is provided that is inclined inward with respect to the main cutting edge and is positioned on a plane substantially perpendicular to the axis, and the guide portion and the guided portion are: The insert is formed so as to extend in parallel with the main cutting edge forming the outer peripheral cutting edge, and the cutout portion is provided to be opened in a surface facing the tool base end side of the mounting seat. When mounted on the seat, the auxiliary cutting edge is arranged substantially parallel to a horizontal plane perpendicular to the tool axis. In this state, when the adjustment wedge is inserted toward the inside in the tool radial direction, a part of the adjustment wedge is exposed from the surface facing the tool proximal end side of the mounting seat, and the surface facing the tool proximal end side of the insert , And the insert is moved along a guide portion provided on the mounting seat so as to extend in the direction parallel to the main cutting edge and in the axial direction of the tool body.

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 tool axis, so that the finished surface when the workpiece is cut by the above-mentioned milling cutter The surface roughness is improved, and it is not necessary to provide a separate wiper blade. Further, since it is only necessary to adjust the position of the insert in the tool axis direction by inserting the adjustment wedge, the labor and time required for adjusting the amount of deflection of the cutting blade can be greatly reduced.
Moreover, since the feed force acting on the inner side in the tool radial direction from the main cutting edge to the insert can be received by the fitting of the guide part and the guided part, the mounting rigidity is improved and the insert is displaced due to the cutting resistance during cutting. Can be prevented.

  Further, the insert is formed in a substantially polygonal flat plate shape, and a main cutting edge that forms an outer peripheral cutting edge when the insert is attached to the mounting seat is provided on the side ridge portion of the polygon. On the tool front end side of the main cutting edge, a sub cutting edge is provided that is inclined inward with respect to the main cutting edge and is positioned on a plane substantially perpendicular to the axis, and the guide portion and the guided portion are: By being formed so as to extend in a direction orthogonal to the main cutting edge forming the outer peripheral cutting edge, the notch portion is provided by being opened on a surface facing the inner side in the tool radial direction of the mounting seat, When the insert is mounted on the mounting surface, the auxiliary cutting edge is disposed substantially parallel to a horizontal plane orthogonal to the tool axis. In this state, when the adjustment wedge is inserted toward the tool proximal end side, a part of the adjustment wedge is exposed from the surface facing the tool radial inner side of the mounting seat, and the surface of the insert facing the tool radial inner side , And the insert is moved along a guide portion provided on the mounting seat so as to extend in the direction orthogonal to the main cutting edge and in the axial direction of the tool body.

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 tool axis, so that the finished surface when the workpiece is cut by the above-mentioned milling cutter The surface roughness is improved, and it is not necessary to provide a separate wiper blade. Further, since it is only necessary to adjust the position of the insert in the tool axis direction by inserting the adjustment wedge, the labor and time required for adjusting the amount of deflection of the cutting blade can be greatly reduced.
In addition, since the change in the amount of movement of the insert in the tool axis direction with respect to the change in the amount of insertion of the adjustment wedge is small, it is possible to adjust the cutting edge deflection amount with high accuracy.

  Further, the insert has a substantially polygonal flat plate shape, and a cutting edge is provided on each side ridge portion of the polygon, and the seating surface is in contact with the mounting seat when the tool body is mounted. 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 surface. One of the serration grooves extending in the direction is selectively used as the guided portion, and the guide portion is a protruding portion into which the serration groove can be fitted, thereby extending the serration groove. The position of the insert can be adjusted along. 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 changed in corners and used sequentially, 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 and accurately adjusting the position of the insert and obtaining high cutting edge runout 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.
1 to 4 show a milling cutter according to a first embodiment of the present invention. 5 to 8 show an insert used in the present embodiment.
The milling cutter 31 includes a tool body 32, an insert 33, and an adjustment wedge 34.

  The tool main body 32 is made of a steel material and has a substantially disk shape. The tool main body 32 is attached to the spindle end of the machine tool via an adapter along the axis O of the disk at the center of the disk. Mounting holes 41 are formed. A plurality of tip pockets 42 are formed on the outer peripheral portion of the tool main body 32 on the front end side 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 of these chip pockets 42 is further determined. On the rear side of T, a mounting seat 43 for the insert 33 is provided.

  The mounting surface 43A of the mounting seat 43 is slightly inclined so as to go to the tool rotation direction T side as it goes to the tool tip side, and this mounting surface 43A protrudes as a guide part that regulates the moving direction of the insert 33. The strips 44 have a V-shaped cross section and are formed at an equal pitch. The protrusion 44 is provided along the adjustment direction X of the insert 33 shown in FIG. 1. In the present embodiment, the tool tip side is inclined toward the tool radial direction inner side with respect to the tool axis O direction. It is provided in the direction.

A notch portion 45 in which the tool main body 32 is notched is provided on the tool base end side of each mounting seat 43, and a screw hole 46 is provided on a wall surface in the tool radial direction of the notch portion 45. . The screw hole 46 is formed so as to extend along a plane perpendicular to the axis O, and the notch 45 has a constant inner diameter with a cross section having a center line that is eccentric in parallel to the tool base end side from the center line of the screw hole 46. However, the side edge of the mounting seat 43 is opened to the mounting seat 43.
The adjustment wedge 34 has a substantially cylindrical shape with an outer diameter that can be inserted into a circular cross section formed by the notch 45. However, the side portion directed toward the tool tip side has a tool tip side toward the tool outer periphery side. A wedge surface is formed and protrudes toward the mounting seat 43.

  The adjustment wedge 34 has a screw hole that is twisted in the opposite direction to the screw hole 46 with an eccentric amount equal to the eccentric amount between the center line of the screw hole 46 and the center line of the notch 45, and A wedge moving screw 47, which is provided so as to be eccentric from the center line to the side opposite to the wedge surface, and in which the screw hole and the screw hole 46 are respectively screwed into the screw holes, is screwed. The adjustment wedge 34 is brought into contact with the side surface opposite to the wedge surface in close contact with the tool proximal side wall surface of the notch 45 and the wedge surface in close contact with the surface 33A of the insert 33 facing the tool proximal side. In this way, it is inserted into the notch 45.

  A female screw portion 49 for mounting the insert 33 with a clamp screw 48 is formed on the surface of the mounting seat 43 facing the tool rotation direction T. The insert 33 is detachably mounted on each mounting seat 43 by screwing a clamp screw 48 to the female screw portion 49.

  The insert 33 is made of a hard material such as cemented carbide and is formed in a substantially square flat plate shape in plan view. The insert 33 has a flat upper surface portion 51 that forms a rake face, a bottom surface portion 52 that forms a seating surface, and a relief surface. And four side portions. The four side surface portions are provided so as to be gradually inclined outward from the bottom surface portion 52 toward the upper surface portion 51, and the insert 33 is formed in an isosceles trapezoidal shape when viewed from the side surface, and the side surface portion has a clearance angle. Positive inserts.

  Main cutting edges 54 are provided on four side ridges formed by intersecting ridge lines between the upper surface 51 and the four side surfaces, and each main corner 51 of the upper surface 51 is intersected by two corners. A pair of auxiliary cutting edges 55 that are inclined inward with respect to the blade 54 are provided so as to intersect the main cutting edge 54 at an obtuse angle, and the auxiliary cutting edges 55 also intersect at an obtuse angle. The insert 33 is provided with a hole through which the clamp screw 46 for attaching the insert 33 to the attachment seat 43 is inserted so as to penetrate the bottom surface portion 52 from the center portion of the upper surface portion 51. Further, the insert 33 is 90 ° rotationally symmetric with respect to the center line of the hole, and is also formed symmetrically with respect to a plane passing through the midpoints of the two side ridges.

  The bottom surface 52 has the same shape extending parallel to each other in a direction perpendicular to the main cutting edge 54 provided on each side ridge of the square formed by the insert 33 when the insert 33 is viewed from the bottom surface 52 side. Serrated grooves 56 having the same V-shaped cross section are provided at an equal pitch. In the present embodiment, since the insert 33 is formed in a substantially square shape in plan view, the serration grooves 56 are provided in two directions orthogonal to each other, and the two orthogonal serration grooves 56 are also in the same shape. It is the same size and formed at an equal pitch. Therefore, a plurality of convex quadrilateral pyramid-shaped convex portions 53 having the same shape and size are formed on the bottom surface portion 52 by serration grooves 56 formed in the two directions, and the upper surface of the convex portion 53 is the center line of the hole portion. In other words, the convex portion 53 is formed in a regular quadrangular frustum shape.

  A protrusion 44 formed on the attachment surface 43A of the attachment seat 43 in a direction in which the tool tip side is inclined inward in the tool radial direction with respect to the tool axis direction, and a bottom cutting portion 52 of the insert 33 with respect to the main cutting edge 54 When the insert 33 is mounted on the mounting seat 43 in such a manner that the serration grooves 56 formed in the orthogonal directions are fitted to each other, when the insert 33 is mounted on the mounting seat 43, the insert 33 is located closest to the tool tip side. The sub cutting edge 55A that is positioned is positioned substantially parallel to a horizontal plane that is orthogonal to the tool axis O.

  In the milling cutter 31 configured as described above, the mounting bolt is inserted into the mounting hole 41 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 outer periphery of the insert 33 is directed to the outer peripheral side of the tool by being attached to the spindle end of the machine tool via the adapter, rotated at a high speed in the tool rotation direction T, and fed in a direction intersecting the axis O. The material to be cut is cut by the cutting edge and the front cutting edge directed to the tip side of the tool.

In the milling cutter 31 configured as described above, the position of the insert 33 is adjusted by tightening the wedge moving screw 47, inserting the adjustment wedge 34 inward in the tool radial direction, and the tool base of the insert 33 on the wedge surface of the adjustment wedge 34. This is done by pressing the surface 33A facing the end side.
When the adjustment wedge 34 is inserted on the inner side in the tool radial direction, the insert 33 is moved along the protrusion 44 formed on the attachment surface 43A of the attachment seat 43, and therefore the direction other than the adjustment direction of the insert 33 Therefore, the position of the insert 33 can be accurately adjusted, and the labor and time required for adjusting the amount of deflection of the cutting blade can be greatly reduced.

Further, in the milling cutter 31 configured as described above, the change in the movement amount of the insert 33 with respect to the change in the insertion amount of the adjustment wedge 34 inside the tool radial direction is changed by changing the inclination angle of the wedge surface of the adjustment wedge 34. Since it can be made small, the position adjustment of the insert 33 can be performed with high accuracy.
Further, since the protrusion 44 and the serration groove 56 are parallel to the main cutting edge 54A forming the outer peripheral cutting edge, a feed force acting on the inner side in the tool radial direction from the main cutting edge 54A to the insert 33 is serrated with the protrusion 44. It can be received by fitting with the groove 56, the mounting rigidity is improved, and the insert 33 can be prevented from being displaced due to the cutting resistance at the time of cutting.

  Further, in the milling cutter 31 configured as described above, the amount of swing of the cutting blade can be adjusted with high accuracy, and the position of the insert 33 can be adjusted while keeping the cutting angle of the sub cutting blade 55 constant. The surface roughness of the finished surface formed when the workpiece is cut by the milling cutter 31 is good, and it is not necessary to separately provide a wiper blade (wiping blade), and the replacement frequency of the insert 33 can be reduced. it can.

  Further, in the milling cutter 31 having the above-described configuration, the cutout portion 45 has a substantially circular shape with a constant inner diameter, and can be formed only by drilling the tool main body 32, so that the processing cost can be reduced. it can. In addition, the notch 45 is provided eccentrically in parallel to the tool base end side from the center line of the screw hole 46, and the adjustment wedge 34 having a substantially cylindrical shape is moved by the wedge moving screw 47 screwed into the screw hole 46. Therefore, when the wedge moving screw 47 is rotated, the adjustment wedge 34 can be prevented from being rotated in the notch 45.

Next, a second embodiment of the present invention will be described.
9 to 12 show a milling cutter according to a second embodiment of the present invention.
In the milling cutter 61 according to the second embodiment, the protrusions 74 as guide portions for restricting the moving direction of the insert 33 provided on the mounting surface 43A are formed at an equal pitch with a V-shaped cross section, As shown in FIG. 11, it is provided along the adjustment direction Y of the insert 33. In the present embodiment, the tool tip side is provided in a direction inclined toward the outside in the tool radial direction with respect to the tool axis O direction. ing.

A notch 75 in which the tool main body 32 is notched is provided on the inner side in the tool radial direction of each mounting seat 43, and a screw hole 76 is provided in a wall surface on the tool base end side of the notch 75. . The screw hole 76 is formed so as to extend in the direction of the axis O, and the notch 75 has a substantially circular shape with a constant inner diameter in cross section having a center line that is eccentric in parallel to the tool radial direction inner side from the center line of the screw hole 76. However, the side edge of the mounting seat 43 is opened to the mounting seat 43.
The adjustment wedge 64 has a substantially cylindrical shape with an outer diameter that can be inserted into a circular cross section formed by the notch 75. However, the side portion directed outward in the tool radial direction has a tool radial direction according to the direction toward the tip of the tool. A wedge surface toward the outside is formed and protrudes toward the mounting seat 43.

  The adjustment wedge 64 has a screw hole that is twisted in the opposite direction to the screw hole 76 with an eccentric amount equal to the eccentric amount between the center line of the screw hole 76 and the center line of the notch 75, and is formed of a cylinder formed by the adjustment wedge 64. A wedge moving screw 77, which is provided so as to be eccentric from the center line on the opposite side to the wedge surface and in which the screw hole and the screw hole 76 are respectively screwed into the screw holes, is screwed. The adjustment wedge 64 is attached with the side opposite to the wedge surface in close contact with the inner surface of the notch 75 in the tool radial direction and the wedge surface in contact with the surface 33B of the insert 33 facing inward in the tool radial direction. It is inserted into the notch 75 so as to contact.

  A protrusion 74 formed on the attachment surface 43A of the attachment seat 43 in a direction in which the tool tip side is inclined outward in the tool radial direction with respect to the tool axis direction, and a bottom cutting portion 52 of the insert 33 with respect to the main cutting edge 54 When the insert 33 is mounted on the mounting seat 43 in such a manner that the serration grooves 56 formed in the orthogonal directions are fitted to each other, when the insert 33 is mounted on the mounting seat 43, the insert 33 is located closest to the tool tip side. The sub cutting edge 55A that is positioned is positioned substantially parallel to a horizontal plane that is orthogonal to the tool axis.

In the milling cutter 61 configured as described above, the position of the insert 33 is adjusted by tightening the wedge moving screw 77 and inserting the adjustment wedge 64 on the tool base end side, and the tool diameter of the insert 33 on the wedge surface of the adjustment wedge 64. This is done by pressing the surface 33B facing inward.
When the adjustment wedge 64 is inserted toward the tool base end side, the insert 33 is moved along the ridge 74 formed on the attachment surface 43A of the attachment seat 43. Therefore, the position of the insert 33 can be accurately adjusted, and the labor and time required for adjusting the amount of deflection of the cutting blade can be greatly reduced.

  Further, in the milling cutter 61 having the above-described configuration, by changing the inclination angle of the wedge surface of the adjustment wedge 64, the change in the movement amount of the insert 33 with respect to the change in the insertion amount of the adjustment wedge 64 toward the tool base end side is changed. Since the size can be reduced, the position of the insert 33 can be adjusted with high accuracy.

Further, in the milling cutter 61 having the above-described configuration, the amount of deflection of the cutting blade can be adjusted with high accuracy, and the position of the insert 33 can be adjusted while keeping the cutting angle of the auxiliary cutting blade constant. The surface roughness of the finished surface formed when the workpiece is cut by the milling cutter 61 is good, and it is not necessary to separately provide a wiper blade (wiping blade), and the replacement frequency of the insert 33 can be reduced. .
Moreover, since the protrusion 74 and the serration groove 56 are orthogonal to the main cutting edge 54A forming the outer peripheral cutting edge, the movement amount of the insert 33 in the tool axis O direction with respect to the movement amount of the adjustment screw 64 is reduced. It is possible to adjust the cutting edge runout amount with higher accuracy.

  Further, in the milling cutter 61 having the above-described configuration, the cutout portion 75 has a substantially circular cross section with a constant inner diameter, and can be formed only by drilling the tool body 32, so that the processing cost can be reduced. it can. Further, the notch 75 is provided eccentrically in parallel to the tool base end side from the center line of the screw hole 76, and the adjustment wedge 64 having a substantially cylindrical shape is moved by the wedge moving screw 77 screwed into the screw hole 76. Therefore, when the wedge moving screw 77 is rotated, the adjustment wedge 64 can be prevented from rotating in the notch 75.

  In the milling cutters 31 and 61 having the above-described configuration, the serration grooves 56 that can be fitted into the protrusions 44 and 74 formed on the mounting seat 43 of the front milling cutters 31 and 61 are provided in two directions in the insert 33. Since the plurality of convex portions 53 are formed on the bottom surface portion 52 forming the seating surface, the insert 33 can be firmly fixed to the mounting seat 43 by the wedge effect, and the mounting rigidity is increased. Thus, it is possible to prevent the insert 33 from being displaced due to cutting resistance during cutting. In addition, since the serrated grooves 56 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 33 is remounted between these two directions, such as during a corner change. Can do.

  Further, since the serration groove 56 is provided in the insert 33 in a direction perpendicular to the substantially square side, the corner of the insert 33 is changed, and the four main cutting edges of the insert 33 are sequentially used as outer peripheral cutting edges. Even in this case, the serration groove 56 can be fitted into the protrusions 44 and 74 provided on the mounting seat 43 of the front milling cutters 31 and 61, and the position adjustment of the insert 33 can be easily performed.

  In addition, in order to fix the position of the adjustment wedge after adjusting the cutting edge deflection amount, a fixing screw may be screwed into the tool main body and brought into contact with the side surface of the adjustment wedge. In this case, since the adjustment wedge is fixed at two locations, the wedge moving screw and the fixing screw, the adjustment wedge is firmly fixed, and it is possible to prevent the adjustment wedge from moving due to vibration or the like due to cutting.

  Moreover, in said embodiment, although demonstrated as a protrusion part with a V-shaped cross section as a guide part formed in the mounting seat of a milling cutter, the cross-sectional wave type | mold which a concave curve and a convex curve comprise continuously. 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.

  In the above embodiment, the milling cutter that fixes the insert with the clamp screw has been described. However, the insert itself is also sandwiched and fixed between the tool body with the wedge member inserted on the upper surface portion 51 side. Things can be used. 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.

In the above embodiment, the insert is described as a square in plan view. However, the insert may be a polygon in plan view. For example, in the case of a triangular insert, the seating surface has a triangular pyramid-like protrusion. If the convex part formed on the seating surface is formed in a conical shape, it can be attached to the ridge part of the mounting seat without being limited to the shape of the insert. The same effect as in the 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.

It is a front view of the insert attachment part of the milling cutter which is 1st embodiment of this invention. It is a side 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 top view of an insert used in an embodiment of the present invention. It is a bottom view of the insert used in the embodiment of the present invention. It is the side view which looked at the insert used by embodiment of this invention from the A direction. It is the side view seen from the B direction of the insert used in the embodiment of the present invention. It is a front view of the insert attachment part of the milling cutter which is 2nd embodiment of this invention. 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 side surface sectional drawing of the conventional milling cutter. It is detail drawing of the insert attachment part of the conventional milling cutter.

Explanation of symbols

31, 61 Milling cutter 32 Tool body 33 Insert 34, 64 Adjustment wedge 42 Chip pocket (recess)
43 Mounting seats 44, 74 Projection part (guide part)
45, 75 Notch 53 Protrusion 54 Main cutting edge 55 Sub cutting edge 56 Serration groove (guided part)

Claims (4)

A mounting seat is provided in a recess formed in the outer periphery of the tip of the substantially disk-shaped tool body that rotates about the axis, and an insert having a cutting edge is attached to the mounting seat so that the seating surface is in close contact with the mounting seat. A milling cutter
On the mounting seat, at least a guide portion extending in the axial direction of the tool body is formed, and on the seating surface of the insert, a guided portion is slidably fitted in the extending direction of the guide portion. Is formed,
The tool body is provided with a notch that opens in a wall surface that intersects with the direction in which the guide portion of the mounting seat extends, and the notch is pressed against the side surface of the insert to adjust the position of the insert. A milling cutter, wherein an adjustment wedge is inserted. The milling cutter according to claim 1,
The insert is formed in a substantially 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 substantially perpendicular to the axis is provided on the tool front end side of the cutting edge, and the guide portion and the guided portion are arranged on the outer periphery. It is formed to extend parallel to the main cutting edge that forms the cutting edge,
The milling cutter according to claim 1, wherein the notch is provided to be opened in a surface facing the tool base end side of the mounting seat. The milling cutter according to claim 1,
The insert is formed in a substantially 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 substantially perpendicular to the axis is provided on the tool front end side of the cutting edge, and the guide portion and the guided portion are arranged on the outer periphery. It is formed to extend in a direction perpendicular to the main cutting edge forming the cutting edge,
The milling cutter, wherein the notch is provided by being opened on a surface of the mounting seat facing the inside in the tool radial direction. In the milling cutter in any one of Claims 1-3,
The insert has a substantially polygonal flat plate shape, and a cutting edge is provided on each side ridge portion of the polygon. When the insert is attached to the tool body, the seating surface is in contact with the mounting seat. 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,
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. Milling cutter to do.

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