JP2006334686A - Milling cutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a milling cutter, simply and surely adjusting the positions of two or more inserts, remarkably reducing the time and labor required for run-out adjusting work for a cutting blade, and obtaining high cutting blade run-out accuracy. <P>SOLUTION: In this milling cutter, a plurality of mounting eyes 15 are formed in the outer periphery of the tip of a tool body 2 rotated around the axis, the inserts 41 having cutting blades are removably installed on the mounting eyes, and the cutting blades of the inserts 41 are disposed to project over the tool body 12. One mounting eye 15A of the plurality of mounting eyes 15 is the reference mounting eye 15A in which when the insert 41 is mounted, the cutting blade is projected largely more than the cutting blades of the inserts 41 mounted on the other mounting eyes 15B, and the position of the cutting blade of the insert 41 is fixed. The other mounting eyes 15B are provided with an adjusting mechanism for adjusting the position of the cutting blade of the insert 41. <P>COPYRIGHT: (C)2007,JPO&INPIT

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 end of a tool body.

  Conventionally, a milling cutter equipped with a plurality of inserts having cutting edges has been used as a turning tool for performing planar processing on a workpiece. In this type of milling cutter, an insert made of a hard material such as cemented carbide is detachably attached to a plurality of chip pockets and mounting seats formed on the outer periphery of the tip of the disk-shaped tool body, Cutting the workpiece with cutting edges directed to the tool body outer peripheral side and the tool body tip side of the insert by rotating the tool body about its axis at high speed and feeding in the direction intersecting the axis. It is.

  Here, in the milling cutter with a plurality of inserts, when the cutting amount of the cutting edge of each insert is different and the fluctuation of the cutting blade (the difference between the maximum value and the minimum value of the cutting amount of the cutting blade) is large The cutting edge tool of each insert will wear preferentially and the insert will be replaced more frequently and the surface roughness of the finished surface of the workpiece will deteriorate. High cutting edge runout accuracy must be provided so that the amount of protrusion from the main body is the same. That is, the inserts must be mounted so that the rotation trajectory around the axis O of the tool body drawn by the cutting blade of each insert matches.

Accordingly, there has been proposed a milling cutter including an adjustment mechanism for adjusting the protruding amount of each cutting blade by moving the position of the insert (Patent Document 1, Patent Document 2).
As an insert position adjustment mechanism, an insert is sandwiched between a wall surface on the rear side in the tool body rotation direction of the mounting seat and a wedge member inserted on the front side in the tool rotation direction of the mounting seat. There are some which project the cutting edge of the insert from the tool body by pressing the side facing the end side with the tip of the adjustment screw or the pressing surface of the adjustment wedge.

In addition, the insert is attached to the mounting seat with a clamp screw, and the side of the insert facing the rear end side of the tool body is pressed with the tip of the adjustment screw or the pressing surface of the adjustment wedge to clamp There is also provided a mechanism for elastically deforming a screw to project a cutting blade from a tool body.
In conventional milling cutters, all the mounting seats are equipped with the adjustment mechanism as described above, and the position of all the inserts mounted on the mounting seats can be adjusted to reduce the runout of the cutting blade. It is.

A milling cutter equipped with such an adjustment mechanism is used to adjust the amount of protrusion of the cutting blade by moving the position of the insert with an adjustment screw or adjustment wedge, and then rotate the tool body around its axis O at high speed. By being sent in a direction crossing O, the workpiece is cut by a cutting blade directed toward the tool body radial direction outside of the insert and the tool body tip side.
Japanese Patent Laid-Open No. 2001-252813 JP 2001-246515 A

  By the way, in the milling cutter provided with the conventional adjustment mechanism, the runout adjustment of the cutting blade is performed in the following procedure. First, inserts are mounted on all mounting seats, and the protruding amount of the cutting blade of each insert is confirmed. After firmly fixing the insert of the mounting seat from which the cutting blade protrudes, the position of other inserts is adjusted based on the protruding amount of the cutting blade of the insert mounted on the mounting seat.

When adjusting the runout of the cutting edge in this way, it is first necessary to find the mounting seat from which the cutting edge protrudes the most, but it is easy to find the difference in the protruding amount of the cutting edge that slightly protrudes from the tool body. Rather, it took a lot of time and effort to adjust the runout.
Moreover, since the position adjustment mechanism of the insert is also provided in the reference mounting seat, the insert may move when trying to firmly fix the insert. When the insert has moved, the amount of protrusion of the cutting edge changes, so it was necessary to check the amount of protrusion of the cutting edge again. In particular, in the case where the insert is sandwiched between wedge members, the insert is easy to move.

  In addition, the reference mounting seat changes each time the insert is replaced, and it is necessary to adjust the protruding amount of multiple cutting edges. There was a risk of misunderstanding. If machining is performed while misunderstanding that the runout adjustment of the cutting edge has been completed, there is a possibility that troubles may occur such that the workpiece becomes defective or the insert is damaged.

  The present invention has been made in view of the above circumstances, and can easily and surely adjust the position of a plurality of inserts, and can significantly reduce the time and labor required for the adjustment operation of the cutting edge. An object of the present invention is to provide a milling cutter capable of obtaining high cutting edge runout accuracy.

  In order to solve the above-mentioned problems, the present invention is configured such that a plurality of mounting seats are formed on the outer periphery of the tip of a tool body rotated about an axis, and an insert having a cutting blade is detachably mounted on the mounting seat. The milling cutter is arranged such that the cutting edge of the insert protrudes from the tool body, and one of the plurality of mounting seats is mounted with the insert. The cutting blade protrudes larger than the cutting blade of the insert mounted on the remaining mounting seat, and the position of the cutting blade of the insert is a fixed mounting seat, and the remaining mounting seat Is characterized in that an adjustment mechanism for adjusting the position of the cutting edge of the insert is provided.

  The milling cutter having the above-described configuration is provided with a reference mounting seat in which the position of the cutting edge of the insert is fixed, and the amount of protrusion of the insert mounted on the reference mounting seat is the cutting amount of the insert mounted on the remaining mounting seat. Since it is set to be larger than the protruding amount of the blade, when the insert is mounted on all mounting seats, the cutting amount of the cutting edge of the reference mounting seat is always the largest, and when adjusting the runout of the cutting blade In addition, it is possible to adjust the cutting edge of the reference mounting seat as a reference, and the time and labor required for adjusting the cutting edge runout can be greatly reduced.

In addition, since the reference mounting seat is not equipped with an adjustment mechanism that adjusts the position of the cutting blade, the insert mounted on the reference mounting seat does not move, and the protruding amount of the reference cutting blade is stable. become. Therefore, the protrusion amount used as a reference does not change during the cutting edge deflection adjustment operation, and high cutting edge deflection accuracy can be obtained.
In addition, the cutting edge of the insert mounted on the reference mounting seat always protrudes the most, and the cutting edge can be adjusted with reference to this cutting edge. Therefore, it is possible to adjust the runout of the cutting blade reliably and easily. Therefore, it is possible to reduce the runout of the cutting edge of the milling cutter, so that the workpiece can be cut easily, the finished surface can be finished smoothly, and there is no insert that preferentially wears, and the replacement frequency of the insert. Can be lowered.

  Here, the amount of protrusion in the axial direction of the cutting blade of the insert attached to the reference attachment seat with respect to the cutting blade of the insert before being attached to the remaining attachment seat and performing position adjustment by the adjustment mechanism By setting P within the range of 0.01 mm to 0.1 mm, the amount of protrusion when the insert is mounted on the reference mounting seat can be set within the range suitable for cutting, and the protrusion of the cutting edge The trouble that the amount is too large and the insert is damaged during cutting, or the trouble that the cutting amount of the cutting blade is too small and the tool body slides with the workpiece can be prevented.

  In addition, by providing a display that can identify the reference mounting seat on the tool body, the reference mounting seat can be reliably identified, and the trouble that the reference mounting seat is mistaken during the runout adjustment work of the cutting blade. It can be prevented in advance. Therefore, it is possible to more reliably and easily perform the deflection adjustment operation of the cutting blade with high accuracy.

  Therefore, according to the present invention, the position adjustment of a plurality of inserts can be performed easily and reliably, the time and labor required for the cutting edge runout adjustment work can be greatly reduced, and high cutting edge runout accuracy can be obtained. It is possible to provide a milling cutter capable of performing the above.

Embodiments of the present invention will be described with reference to the accompanying drawings. 1 to 5 show a milling cutter according to an embodiment of the present invention.
The milling cutter 11 has a tool main body 12 that is made of a steel material and has a substantially disk shape, and an insert 41 having a cutting edge 42 is disposed on the outer periphery on the tip side of the tool main body 12.

  An attachment hole 13 for attaching the tool main body 12 to the spindle end of the machine tool or the like via an adapter is formed at the center of the disk formed by the tool main body 12 along the axis O of the tool main body 12. A plurality of chip pockets 14 are formed on the outer peripheral surface of the tool main body 12 so as to open to the outer peripheral surface and the front end surface of the tool main body 12, and the tool rotation direction T of these chip pockets 14 is further increased. A mounting seat 15 is provided on each rear side. In the present embodiment, as shown in FIG. 2, six chip pockets 14 and mounting seats 15 are formed.

  The mounting surface 16 of the mounting seat 15 is slightly inclined toward the front side of the tool rotation direction T as it goes toward the tip end side of the tool body 12, and the mounting surface 16 is a guide that regulates the moving direction of the insert 41. A protrusion is provided as a portion along the adjustment direction X of the insert 41 shown in FIGS. 1 and 5. In the present embodiment, the tip end of the tool body 12 is the diameter of the tool body 12 with respect to the axis O direction. It is provided so as to extend in a direction inclined toward the inner side in the direction. The protrusions have a convex V-shaped cross section perpendicular to the adjustment direction X and are formed in parallel at a constant pitch in a direction perpendicular to the adjustment direction X on the mounting surface 16. A clamp screw 17 for attaching the insert 41 is screwed to the attachment surface 16 of the attachment seat 15 in a direction perpendicular to the attachment surface 16.

  Of the plurality of mounting seats 15, one mounting seat 15 serves as a reference mounting seat 15 </ b> A, and the remaining mounting seats 15 </ b> B other than the reference mounting seat 15 </ b> A are provided with an adjusting mechanism 18. Here, on the rear end side of the tool main body 12 of the remaining mounting seat 15B, a notch portion 19 in which the tool main body 12 is notched so as to open outward in the radial direction of the tool main body 12 is provided. The notch 19 has an oval cross section, and the side edge on the side of the mounting seat 15B is opened toward the mounting seat 15B. Further, a screw hole extending inward in the radial direction of the tool body 12 is formed on the bottom surface of the notch 19 facing the outer peripheral side of the tool body 12.

An adjustment piece 31 is inserted into the notch 19. The adjustment piece 31 has a cylindrical shape having an outer shape that can be inserted into an oval cross section formed by the notch 19, and a surface facing the mounting seat 15 </ b> B is a flat surface, and the flat surface is a pressing portion 32. ing. The inner surface of the cylindrical body formed by the adjustment piece 31 has a circular cross section, and the diameter gradually increases toward the side opposite to the insertion direction of the adjustment piece 31 (in the present embodiment, the outer side in the radial direction of the tool body 12). A diameter hole 33 is formed, and the insertion direction side of the diameter expansion hole 33 is a small diameter hole 34 coaxial with the diameter expansion hole 33 and having a small inner diameter, and penetrates the adjustment piece 31. The central axes of the enlarged diameter hole 33 and the small diameter hole 34 are parallel to the pressing portion 32.
The adjustment piece 31 has a slit extending in parallel with the pressing portion 32 and along the central axis of the circular cross section of the small diameter hole 34, and the pressing portion 32 from the small diameter hole 34 side to the middle of the small diameter hole 34. It is formed in the provided range.

An adjustment screw 35 is inserted into the adjustment piece 31 so as to penetrate the small diameter hole 34 and the diameter expansion hole 33. The adjustment screw 35 has a male screw portion on the front end side and a head portion having a larger diameter on the rear end side than the male screw portion. The head portion gradually increases toward the rear end side of the adjustment screw 35. It is formed in a tapered shape whose diameter increases. Then, the adjustment piece 31 is inserted into the cutout portion 19, the adjustment screw 35 is inserted into the inner peripheral portion of the adjustment piece 31, and the male screw portion is formed on the bottom surface of the cutout portion 19 facing the outer peripheral side of the tool body 12. By screwing into the hole, the head portion formed in a tapered shape and the diameter-enlarging hole 33 of the adjustment piece 31 are arranged to contact each other.
Further, a through hole 36 is formed on the rear side of the mounting seat 15B in the tool rotation direction T so that the tip of the clamp screw 17 screwed to the mounting surface 16 is exposed.

  On the other hand, on the rear end side of the tool main body 12 of the reference mounting seat 15A, an abutting surface 37 is formed directly on the tool main body 12 itself, with which the side surface of the insert 41 facing the rear end side of the tool main body 12 abuts. Also in the reference mounting seat 15A, a through-hole 36 is formed on the rear side of the mounting seat 15A in the tool rotation direction T so that the tip of the clamp screw 17 is exposed.

Here, the clamp screw 17 screwed to the mounting surface 16 of the reference mounting seat 15A is 0 closer to the distal end side of the tool body 12 than the clamp screw 17 screwed to the mounting surface 16 of the remaining mounting seat 15B. Is provided at a position deviated from 0.1 mm to 0.05 mm (0.05 mm in the present embodiment), and as shown in FIGS. 3 and 4, the through hole provided on the rear side in the tool rotation direction T of the reference mounting seat 15A The hole 36 is also arranged at a position shifted by 0.01 mm to 0.1 mm (0.05 mm in the present embodiment) on the distal end side of the tool body 12 with respect to the through hole 36 provided on the rear side in the tool rotation direction T of the mounting seat 15B. It has been done.
In addition, a marking 38 is engraved or painted on the tool body 12 on the periphery of the reference mounting seat 15A (in this embodiment, the side surface of the mounting seat 15A on the rear end side of the tool body 12).

  The insert 41 attached to the mounting seat 15 is made of a hard material such as cemented carbide, is formed in a square flat plate shape in plan view, and has a flat top surface portion that forms a rake face and a bottom surface portion that forms a seating surface. 43 and four side surfaces forming a flank. The four side surface portions are formed so as to gradually spread outward from the bottom surface portion 43 toward the upper surface portion, and the insert 41 is formed in an isosceles trapezoidal shape when viewed from the side surface, and the side surface portion has a clearance angle. It is a positive insert.

  Cutting edges 42 are provided on four side ridges formed by intersecting ridge lines between the upper surface and the four side surfaces, and the insert 41 is attached to the mounting seats 15A and 15B at the center of the upper surface of the insert 41. An insertion hole through which the clamp screw 17 for attachment is inserted is provided so as to extend in a direction perpendicular to the upper surface portion, and the insert 41 is formed so as to be rotationally symmetric by 90 ° with respect to the center line of the insertion hole. Has been.

  The bottom surface 43 has the same shape extending parallel to each other in a direction perpendicular to the cutting edge 42 provided on each side ridge of the square formed by the insert 41 when the insert 41 is viewed from the bottom surface 43 side. Serrated grooves 44 having a V-shaped cross section of the same size are provided at an equal pitch. In the present embodiment, since the insert 41 is formed in a square flat plate shape, the serration grooves 44 are provided in two directions orthogonal to each other, and the two orthogonal serration grooves 44 are also identical in shape. It is large and formed at an equal pitch.

  Cut into the mounting surface 16 of the mounting seats 15A and 15B in the direction in which the tip end side of the tool body 12 is inclined inwardly in the radial direction of the tool body 12 with respect to the direction of the axis O, and the bottom surface 43 of the insert 41 When the insert 41 is mounted on the mounting seat 15 so that the serration grooves 44 formed in a direction perpendicular to the blade 42 are fitted to each other, the insert 41 is mounted on the mounting seats 15A and 15B. In addition, the cutting blade 42 positioned on the outer side in the radial direction of the tool body 12 is disposed so as to be inclined with respect to the axis O.

Then, the clamp screw 17 is inserted into the insertion hole of the insert 41 and screwed to the attachment surface 16, and the insert 41 is attached to the attachment seats 15 </ b> A and 15 </ b> B. In the reference mounting seat 15A, the side surface of the insert 41 facing the rear end side of the tool body 12 is disposed and fixed so as to contact the contact surface 37. Here, in the reference mounting seat 15A, the clamp screw 17 is screwed to the distal end side of the tool body 12 with respect to the remaining mounting seat 15B, so that the cutting edge 42 of the insert 41 mounted on the reference mounting seat 15A remains. Thus, the cutting edge 42 of the insert 41 that is just attached to the mounting seat 15B by the clamp screw 17 protrudes from the tool body 12. At this time, the protruding amount P in the axis O direction of the cutting edge 42 of the insert 41 mounted on the remaining mounting seat 15B of the cutting edge 42 of the insert 41 mounted on the reference mounting seat 15A is 0.01 mm to 0.00 mm. 1 mm (0.05 mm in this embodiment).
Further, in the remaining mounting seat 15B, the insert 41 is disposed so that the side surface of the insert 41 facing the rear end side of the tool body 12 and the pressing portion 32 of the adjustment piece 31 inserted into the notch portion 19 abut.

  In the milling cutter 11 having the above-described configuration, the mounting bolt is inserted into the mounting hole 13 of the tool body 12, and the tip of the mounting bolt is screwed into the adapter, whereby the tool body 12 is connected to the adapter, and the tool body 12 is The tool body 12 of the insert 41 is attached to the spindle end of the machine tool via an adapter, rotated at high speed in the tool rotation direction T about the axis O, and fed in a direction intersecting the axis O. The material to be cut is cut by a cutting blade 42 directed to the radially outer side and the distal end side of the tool body 12.

  In the milling cutter 11 having the above-described configuration, the deflection adjustment of the cutting blade 42 is performed as follows. First, the position in the axis O direction of the cutting edge 42 of the insert 41 to which the reference mounting seat 15A is mounted is confirmed. The position of the cutting blade 42 of the insert 41 mounted on the remaining mounting seat 15B is adjusted by screwing or loosening the adjusting screw 35 with reference to the protrusion amount P of the cutting blade 42 of the reference mounting seat 15A.

  When the adjustment screw 35 is screwed in, the head of the adjustment screw 35 that is in contact with the diameter expansion hole 33 of the adjustment piece 31 presses the diameter expansion hole 33 and is elastic so that the adjustment piece 31 is expanded by using the end point of the slit as a fulcrum. Deformed, the pressing portion 32 presses the side surface of the insert 41 facing the rear end side of the tool body 12, and the insert 41 protrudes toward the tip end side of the tool body 12 along the protrusion formed on the mounting surface 16 of the mounting seat 15B. Is done. On the other hand, when the adjustment screw 35 is loosened, the adjustment piece 31 that has been elastically deformed so as to be expanded is elastically restored, and the force of pressing the side surface of the insert 41 facing the rear end side of the tool body 12 is reduced. The insert 41 retracts toward the rear end side of the tool body 12.

  According to the milling cutter 11 according to the present embodiment, when the insert 41 is mounted on all the mounting seats 15A and 15B, the cutting edge 42 of the insert 41 mounted on the reference mounting seat 15A is mounted on the remaining mounting seat 15B. Since the protrusion 41 surely protrudes larger than the cutting edge 42 of the inserted insert 41, the deflection of the cutting edge 42 can be adjusted with reference to the cutting edge 42 of the insert 41 mounted on the reference mounting seat 15A. Can be easily and reliably performed.

  Further, the protruding amount P in the axis O direction of the cutting edge 42 of the insert 41 mounted on the remaining mounting seat 15B of the cutting edge 42 of the insert 41 to which the reference mounting seat 15A is mounted is from 0.01 mm to 0.00 mm. 1 mm, which is configured to be 0.05 mm in this embodiment, the amount of protrusion of the cutting blade 42 can be made suitable for cutting, and damage to the insert 41 and the tool body 12 and the workpiece Troubles such as contact with can be prevented in advance.

  Further, since the reference mounting seat 15A is formed with a contact surface 37 with which the side surface of the insert 41 facing the rear end side of the tool body 12 is contacted, the position of the insert 41 is securely fixed and the cutting edge 42 is fixed. The insert 41 does not move during the runout adjustment operation, and the protruding amount of the reference cutting blade 42 is stabilized. Therefore, the deflection adjustment of the cutting edge 42 can be performed accurately and reliably.

  Further, the marking 38 is provided on the reference mounting seat 15A so that the reference mounting seat 15A can be easily confirmed, and the reference mounting seat 15A is not mistaken during the deflection adjustment work of the cutting blade 42, and the cutting blade 42 Can be reliably and easily adjusted. Instead of marking 38 on the reference mounting seat 15A, the reference mounting seat 15A can be identified by marking all the remaining mounting seats 15B and not marking the reference mounting seat 15A. Anyway.

  Moreover, in this embodiment, since the insert 41 is moved along the protrusion formed on the mounting surface 16 of the mounting seat 15B, no deviation occurs in a direction other than the adjustment direction X of the insert 41, and the insert 41 The amount of protrusion of the cutting edge 42 can be adjusted while keeping the angle constant. Further, since it is only necessary to adjust the position of the insert 41 in the direction of the axis O, the labor and time required for adjusting the protrusion amount of the cutting blade 42 can be greatly reduced.

Further, since the position of the insert 41 in the direction of the axis O can be adjusted so as to advance and retract, the amount of protrusion of the cutting blade 42 can be easily adjusted.
Further, since the adjustment piece 31 is elastically deformed, the insert 41 is pressed and the adjustment screw 35 itself is also pressed so that the adjustment screw 35 is loosened when the milling cutter 11 is rotated at a high speed. The insert 41 can be firmly fixed while the amount of protrusion of the cutting blade 42 is reliably maintained.

  In addition, the deflection of the cutting edge 42 can be adjusted with high accuracy, and the position of the insert 41 can be adjusted while keeping the angle of the insert 41 constant. The finished surface can be finished smoothly, and there is no need to provide a wiper blade (wiping blade) separately.

In the present embodiment, the milling cutter provided with the adjustment mechanism using the cylindrical adjustment piece has been described. However, the configuration of the adjustment mechanism is not limited, and for example, adjustment is performed by pressing the side surface of the insert with an adjustment screw. It may be a milling cutter provided with an adjusting mechanism that adjusts by pressing the insert with the side surface of the wedge or wedge material.
Moreover, although the protrusion part was formed in the mounting seat of the milling cutter, and the serration groove which can be fitted to the protrusion part was provided in the bottom face part of the insert, it was explained, it is not limited to this configuration. . However, such a configuration is preferable because it is possible to accurately adjust the runout of the cutting blade while keeping the angle of the insert constant as described above.

Further, although the description has been made with the milling cutter in which the insert is fixed with the clamp screw, the insert may be sandwiched and fixed between the tool body with the wedge member. However, those fixed with a clamp screw are preferable because the insert is firmly fixed without being displaced.
In the above embodiment, the insert is described as a square in plan view made of cemented carbide, but the shape and material of the insert are not limited.

It is side surface sectional drawing of the milling cutter which is embodiment of this invention. It is a bottom view of the milling cutter of FIG. It is a side enlarged view of the reference | standard mounting seat of the milling cutter of FIG. FIG. 3 is an enlarged side view of the remaining mounting seat of the milling cutter of FIG. 1. It is an A direction arrow directional view in FIG.

Explanation of symbols

11 Milling cutter 12 Tool body 15 Mounting seat 15A Reference mounting seat 15B Remaining mounting seat 18 Adjustment mechanism 38 Marking (indication)
41 insert 42 cutting edge

Claims (3)

A plurality of mounting seats are formed on the outer periphery of the tip of the tool body rotated about the axis, and an insert having a cutting blade is detachably mounted on the mounting seat, and the cutting blade of the insert is attached to the tool body. A milling cutter arranged to protrude from the
One of the plurality of mounting seats, the mounting seat protrudes larger than the cutting blade of the insert mounted on the remaining mounting seat when the insert is mounted, A reference mounting seat in which the position of the cutting blade of the insert is fixed,
The milling cutter, wherein the remaining mounting seat is provided with an adjusting mechanism for adjusting the position of the cutting edge of the insert.   The amount of protrusion P in the axial direction of the cutting blade of the insert mounted on the reference mounting seat with respect to the cutting blade of the insert before being mounted on the remaining mounting seat and performing position adjustment by the adjustment mechanism, The milling cutter according to claim 1, wherein the milling cutter is set within a range of 0.01 mm to 0.1 mm.   The milling cutter according to claim 1 or 2, wherein the tool body is provided with a display capable of identifying the reference mounting seat.

Images