JP2006136966A - Milling cutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a milling cutter allowing an easy fine adjustment of a position in a tool axis direction of an insert in a state of a cutting angle of a sub-cutting edge kept constant to obtain high cutting edge run-out accuracy. <P>SOLUTION: In this milling cutter, a mounting seat is provided in a recessed part 42 formed on an outer periphery of a distal end part of a substantially disc-shaped tool main body 32 to be rotated around an axis, and the insert 33 having a cutting edge is attachably/detachably mounted on the mounting seat with its seating surface closely adhered thereon. In the mounting seat, a guide part 44 extending in the axis direction of at least the tool main body 32 is formed. In the seating surface of the insert 33, a part 56 to be guided, slidably fitted in the extended direction of the guide part 44, is formed. In the tool main body 32, an adjusting screw 34 is provided so that the insert 33 may be abutted in the extended direction of the guide part 44. <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.

Further, 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 mounted on the face milling cutter is a wiper blade (sweeper blade). However, the milling cutter provided with the wiper blade has a problem that only the wiper blade is cut, and the wiper blade is preferentially worn, 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).

17 and 18 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 moving 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 an adjustment screw is provided on the tool body so as to abut against the insert in the direction in which the guide portion extends. Is provided.

In the milling cutter having the above configuration, by inserting the adjusting screw, the insert moves at least in 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 axial line. As a result, the insert does not rotate on the mounting surface or shift in a direction other than the moving direction, the position of the insert can be easily adjusted, and the labor and time required for adjusting the amount of deflection of the cutting blade can be reduced. .
Further, since the position adjustment of the insert is performed by screwing an adjustment screw, it is only necessary to form a screw hole in the tool body. Therefore, there are few parts where the tool body is notched, and the rigidity of the tool body can be maintained, and the structure of the insert position adjusting mechanism is simple and the machining cost can be reduced.

  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 tool is formed so as to extend in parallel with the main cutting edge forming the outer peripheral cutting edge, the adjustment screw is inserted from a tool base end side, and one end of the adjustment screw is attached to the mounting seat. By being provided in the tool main body so as to be in contact with the side surface facing the base end side, the sub-cutting blade is arranged substantially parallel to a horizontal plane perpendicular to the tool axis when the insert is mounted on the mounting seat. Is done. In this state, when the adjustment screw is screwed in, the surface of the insert facing the tool base end side is pressed by the tip of the adjustment screw, in a direction parallel to the main cutting edge on the mounting seat and in the axial direction of the tool body. The insert is moved along a guide portion provided to extend.

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 only the position of the insert in the tool axis direction needs to be adjusted by screwing the adjusting screw, 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: The adjustment screw is inserted from the inside in the tool radial direction, and one end of the adjustment screw is attached to the mounting seat. In addition, the auxiliary cutting edge is orthogonal to the tool axis when the insert is mounted on the mounting seat by being provided in the tool main body so as to be in contact with the side surface of the insert facing the inner side in the tool radial direction. It is arranged substantially parallel to the horizontal plane. In this state, when the adjustment screw is screwed in, the surface of the insert facing inward in the tool radial direction is pressed by the tip of the adjustment screw, in a direction perpendicular to the main cutting edge on the mounting seat and in the axial direction of the tool body. The insert is moved along a guide portion provided to extend.

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, so that the finished surface when the workpiece is cut by the above-described milling cutter is adjusted. The surface roughness is improved and there is no need to provide a separate wiper blade. Further, since only the position of the insert in the tool axis direction needs to be adjusted by screwing the adjusting screw, 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 relative to the change in the amount of movement of the adjustment screw is small, the amount of cutting edge deflection can be adjusted with high accuracy.

  In addition, since the adjustment screw is provided obliquely with respect to the extending direction of the guide portion, a change in the amount of movement of the insert with respect to a change in the amount of screwing of the adjustment screw is reduced. This can be performed with higher 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 the insert used in the present embodiment.
The milling cutter 31 includes a tool body 32, an insert 33, and an adjustment screw 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 movement direction X of the insert 33 shown in FIG. 1. In the present embodiment, the tool tip side is inclined inward in the tool radial direction with respect to the tool axis O direction. It is provided in the direction.

On the tool base end side of each mounting seat 43, a screw hole 45 is provided in a direction inclined with respect to the moving direction X of the insert 33, and an adjustment screw 34 is inserted into the screw hole 45. Is in contact with a surface 33A of the insert 33 facing the tool base end side. Therefore, in the present embodiment, the adjustment screw 34 is arranged obliquely with respect to the extending direction of the protrusion 44 even when viewed from the tool rotation direction T side or when viewed from the side. The tip of the adjustment screw 34 has a convex shape such as a spherical shape or a conical shape.
A female thread portion 47 for mounting the insert 33 with the clamp screw 46 is formed on the surface of the mounting seat 43 facing the tool rotation direction T. The insert 33 is detachably attached to each mounting seat 43 by screwing a clamp screw 46 to the female screw portion 47.

  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 adjustment screw 34 and pressing the surface 33A of the insert 33 facing the tool base end side with the distal end portion of the adjustment screw 34. When the adjustment screw 34 is screwed in, the insert 33 is moved along the ridge 44 formed on the mounting surface 43A of the mounting seat 43, so that a deviation occurs in a direction other than the moving direction X of the insert 33. Therefore, the position of the insert 33 can be adjusted accurately, 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 adjusting screw 34 is provided in a direction inclined with respect to the moving direction X of the insert 33, and the movement of the insert 33 with respect to a change in the screwing amount of the adjusting screw 34. Since the change in the amount is small, the position of the insert 33 can be adjusted with higher accuracy than the pitch of the adjusting screw 34.

In the milling cutter 31 having the above-described configuration, 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 53A 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.
In addition, since the protrusion 44 and the serration groove 56 are parallel to the main cutting edge 54A forming the outer peripheral cutting edge, the feed component force acting on the insert 33 in the tool radial direction from the main cutting edge 54A to the insert 33 is serrated. 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.

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. 9, it is provided along the moving direction Y of the insert 33. In the present embodiment, the tool tip side is provided in a direction inclined toward the outer side in the tool radial direction with respect to the tool axis O direction. ing.

  Inside each tool seat 43 in the tool radial direction, a screw hole 75 is provided in a direction inclined with respect to the moving direction Y of the insert 33, and an adjustment screw 64 is inserted into the screw hole 75. Is in contact with the surface 33B of the insert 33 facing the inner side in the tool radial direction. Therefore, in the present embodiment, the adjustment screw 64 is disposed obliquely with respect to the extending direction of the protrusion 74 even when viewed from the tool tip direction or when viewed from the side. The head of the adjustment screw 64 is exposed to a notch 76 provided at the tool tip, and the tip of the adjustment screw 34 has a convex shape such as a spherical shape or a conical shape.

  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 having the above-described configuration, the position of the insert 33 is adjusted by tightening the adjustment screw 64 and pressing the surface 33B of the insert 33 facing the inside in the tool radial direction with the tip of the adjustment screw 64. When the adjusting screw 64 is screwed in, the insert 33 is moved along the ridge 74 formed on the mounting surface 43A. Therefore, the insert 33 is not displaced in a direction other than the moving direction Y of the insert 33, and the insert 33 Can be adjusted accurately, and the labor and time required for adjusting the amount of swing of the cutting blade can be greatly reduced.

  Further, in the milling cutter 61 having the above-described configuration, the adjustment screw 64 is provided in a direction inclined with respect to the moving direction Y of the insert 33, and the movement of the insert 33 with respect to a change in the screwing amount of the adjustment screw 64 is provided. Since the change in the amount becomes small, the position of the insert 33 can be adjusted with higher accuracy than the pitch of the adjusting screw 64.

In the milling cutter 61 having the above-described configuration, 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 auxiliary cutting blade 53 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. it can.
In addition, since the protrusion 74 and the serration groove 56 are orthogonal to the main cutting edge 54A forming the outer peripheral cutting edge, the change in the movement amount of the insert 33 in the tool axis O direction with respect to the change in the movement amount of the adjustment screw 64. Therefore, the adjustment of the amount of swinging out of the cutting edge can be performed with higher accuracy.

  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.

  In the insert 33 having the above-described configuration, the serration groove 56 is provided in a direction orthogonal to the substantially square side. Therefore, the corner of the insert 33 is changed, and the four main cutting edges of the insert 33 are sequentially moved to the outer periphery. Even when used as a cutting blade, the serration groove 56 can be fitted to the protrusions 44 and 74 provided on the mounting seat 43 of the front milling cutters 31 and 61, and the position of the insert 33 can be easily adjusted. .

Next, a third embodiment of the present invention will be described.
FIGS. 13 to 16 show a milling cutter according to a third embodiment of the present invention.
In the milling cutter 81 according to the third embodiment, ridges 94 as guides provided on the mounting surface 43A are formed in a V-shaped cross section at an equal pitch, and as shown in FIG. In the present embodiment, the tool tip side is provided in a direction inclined toward the inside in the tool radial direction with respect to the tool axis O direction.

  The insert 83 used in the present embodiment is made of a hard material such as cemented carbide, is formed in a substantially square flat plate shape in plan view, and a flat upper surface portion 51 that forms a rake face and a bottom surface that forms a seating surface. It has the part 52 and the four side parts 101 which make a flank. The four side surface portions 101 are provided so as to be gradually inclined outward from the bottom surface portion 52 toward the upper surface portion 51, and the insert 83 is formed in an isosceles trapezoidal shape as viewed from the side surface, and the clearance angle is formed on the side surface portion 101. It is a positive insert marked with. The side surface portion 101 is formed with a flat portion 102 in which a part of the side surface portion 101 is cut out in a semi-oval shape at the center, and this flat portion 102 is a plane formed by the upper surface portion 51 of the insert 83. And a plane parallel to the intersecting ridge line formed by the upper surface portion 51 and the side surface portion 101.

Main cutting edges 54 are provided on the four side ridges formed by the intersecting ridge lines of the upper surface portion and the four side surface portions 101, and each main corner portion of the upper surface portion 51 has two main cutting edges that intersect at the corner portion. 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.
Further, the insert 83 is provided with a hole portion through which the clamp screw 46 for attaching the insert 83 to the attachment seat 43 is inserted from the center portion of the upper surface portion 51 through the bottom surface portion 52. The insert 83 is 90 ° rotationally symmetric with respect to the center of the hole, and is also formed symmetrically with respect to a plane that passes through the midpoints of the two side ridges.

  The bottom surface 52 has the same shape extending parallel to each other in a direction orthogonal to the main cutting edge 54 provided on each side ridge of the square formed by the insert 83 when the insert 83 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 83 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 screw hole 95 is provided on the tool base end side of each mounting seat 43 along the movement direction Z of the insert 83, the adjustment screw 84 is inserted into the screw hole 95, and the tip end of the adjustment screw 84 is the insert 83. Is in contact with a flat portion 102 provided on the side surface 101A facing the tool base end side. The adjusting screw 84 is provided along a direction parallel to the upper surface portion 51 of the insert 83 and a direction orthogonal to the intersecting ridge line formed by the upper surface portion 51 and the side surface portion 101A, that is, the moving direction Z of the insert 83.

  A protrusion 94 formed on the mounting surface 43A of the mounting 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 83 with respect to the main cutting edge 54 When the insert 83 is mounted on the mounting seat 43 so that the serration grooves 56 formed in directions orthogonal to each other fit into each other, when the insert 83 is mounted on the mounting seat 43, the insert 83 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 81 configured as described above, the position of the insert 83 is adjusted by tightening the adjustment screw 84 and the flat portion 102 provided on the side surface 101A facing the tool base end side of the insert 83 at the distal end portion of the adjustment screw 84. This is done by pressing. When the adjustment screw 84 is screwed in, the insert 83 is moved along the protruding portion 94 formed on the mounting surface 43A of the mounting seat 43, so that a deviation occurs in a direction other than the moving direction Z of the insert 83. Therefore, the position of the insert 83 can be adjusted accurately, 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 81 having the above-described configuration, the adjustment screw 84 is provided along the moving direction Z of the insert 83, and its tip is perpendicular to the plane formed by the upper surface portion 51 of the insert 83 and the upper surface portion. Since the abutting portion 51 is in contact with the flat portion 102 that is parallel to the intersecting ridge line formed by the side surface portion 101 </ b> A, the insert 83 can be reliably pressed by the adjusting screw 84.

Further, in the milling cutter 81 configured as described above, the amount of swing of the cutting blade can be adjusted with high accuracy, and the position of the insert 83 can be adjusted while keeping the cutting angle of the auxiliary cutting blade 53A constant. The surface roughness of the finished surface formed when the workpiece is cut by the milling cutter 81 is good, and it is not necessary to separately provide a wiper blade (wiping blade), and the replacement frequency of the insert 83 can be reduced. it can.
In addition, since the protrusion 94 and the serration groove 56 are parallel to the main cutting edge 54A forming the outer peripheral cutting edge, the feed force acting on the inner side in the tool radial direction from the main cutting edge 54A to the insert 83 is serrated with the protrusion 94. It can be received by fitting with the groove 56, the mounting rigidity is improved, and the insert 83 can be prevented from being displaced due to the cutting resistance at the time of cutting.

    In the insert 83 having the above-described configuration, the serration groove 56 is provided in a direction orthogonal to the substantially square side, and the flat portions 102 are provided on the four side surfaces 101. Even when the corner change is performed and the four main cutting edges of the insert 83 are sequentially used as outer peripheral cutting edges, the serration groove 56 can be fitted to the protrusion 94 provided on the mounting seat 43 of the front milling cutter 81. The tip of the adjustment screw 84 can be brought into contact with the flat portion 102, and the position of the insert 83 can be easily adjusted. In the present embodiment, the side portion 101 of the insert 83 is provided with the semi-oval flat portion 102, but the shape of the flat portion is not particularly limited. For example, the bottom portion of the four side portions. A flat end portion may be formed on the entire side as long as the tip end of the adjustment screw can be brought into contact therewith.

  In addition, in order to fix the position of the adjustment screw after adjusting the cutting amount of the cutting edge, the fixing screw may be screwed into the tool body and brought into contact with the side surface of the adjustment screw. In this case, since the adjustment screw is fixed by the fixing screw, it is possible to prevent the adjustment screw from being loosened due to vibration caused by cutting.

  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. It may be a sawtooth 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 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 bottom view of the insert used in the embodiment of the present invention. It is a top view of an insert used in an 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. FIG. 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 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 side view of the insert attachment part of the milling cutter which is 3rd embodiment of this invention. It is a bottom view of the insert attachment part of the milling cutter which is 3rd embodiment of this invention. It is side surface sectional drawing of the milling cutter which is 3rd embodiment of this invention. It is a bottom view of the milling cutter which is 3rd embodiment of this invention. It is side surface sectional drawing of an example of the conventional milling cutter. It is detail drawing of the insert attaching part of an example of the conventional milling cutter.

Explanation of symbols

31, 61, 81 Milling cutter 32 Tool body 33, 83 Inserts 34, 64, 84 Adjustment screw 42 Tip pocket (recess)
43 Mounting seats 44, 74, 94 Projection part (guide part)
53 Convex part 54 Main cutting edge 55 Sub cutting edge 56 Serration groove (guided part)

Claims (5)

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 milling cutter according to claim 1, wherein an adjustment screw is provided on the tool body so as to contact the insert in a direction in which the guide portion extends. 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 adjustment screw is inserted from the tool base end side, and one end of the adjustment screw is provided on the tool main body so as to come into contact with a side surface of the insert attached to the mounting seat and facing the tool base end side. A milling cutter characterized by 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 adjustment screw is inserted from the inside in the tool radial direction, and one end of the adjustment screw is provided on the tool main body so as to be in contact with the side surface facing the inside in the tool radial direction of the insert attached to the mounting seat. A milling cutter characterized by being made. In the milling cutter in any one of Claims 1-3,
The milling cutter, wherein the adjustment screw is provided obliquely with respect to a direction in which the guide portion extends. In the milling cutter in any one of Claims 1-4,
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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