JP2007260807A - Milling cutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a milling cutter which can easily and surely adjust the position of a cutting insert, and can achieve high rotation accuracy of cutting edges. <P>SOLUTION: In the milling cutter 10, mounting seats 14 are provided in recessed portions 13 formed on the outer periphery of the tip end portion of a tool body, and cutting inserts 30 having a cutting edge 32 are dismountably mounted on the mounting seats 14. Adjusting members 40 are provided to adjust the axial position of the cutting inserts 30 by moving the cutting inserts 30. The adjusting members 40 have body portions 41 and pressing portions 42. Slits 43 are formed between the body portions 41 and the pressing portions 42. The body portions 41 are provided with set screws 45 so as to elastically deform the pressing portions 42 by making use of the root portions of the slits 43 as fulcrums. The tool body is provided with first wedge members 50 for fixing the body portions 41 of the adjusting members 40 and second wedge members 51 for fixing the cutting inserts 30 arranged thereon. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

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

  Conventionally, a milling cutter equipped with a plurality of cutting inserts has been used as a cutting tool for performing planar processing on a workpiece. In this type of milling cutter, a cutting insert made of a hard material such as cemented carbide is detachably attached to a number of recesses and mounting seats formed on the outer periphery of the tip of the disc-shaped tool body. By rotating the main body around its axis at a high speed and feeding it in a direction crossing the axis, an outer peripheral cutting edge directed to the tool body radial direction of the cutting insert and a front cutting edge directed to the tool body tip side, The material to be cut is cut by.

  By the way, in the milling cutter provided with many cutting inserts, each cutting insert must be attached so that the rotation locus which the cutting blade of each cutting insert draws around the axis line of a tool main body corresponds. That is, this milling cutter must have high cutting edge runout accuracy so that the amount of runout of the cutting edge is the same. When the amount of runout of the cutting blade is different in the milling cutter, the cutting blade with a large runout wears preferentially, so the cutting insert needs to be replaced more frequently and the work piece is finished. There was a problem that the surface was wavy and the surface roughness deteriorated.

Therefore, in the conventional 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 cutting inserts mounted on the 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 worn preferentially, so that the frequency of replacement of the cutting insert is increased.
Therefore, such a milling cutter has been proposed that includes an adjustment mechanism for moving the position of the cutting insert in the axial direction of the tool body and adjusting the amount of swing of each cutting blade (for example, a patent). Reference 1).

  In the milling cutter disclosed in Patent Document 1, a plurality of recesses and mounting seats are formed on the outer periphery of the tip of the tool body, and a rectangular flat plate shape is formed on the wall surface of the mounting seat facing the front side in the tool rotation direction. The cutting insert is seated, and the cutting insert is sandwiched and fixed by the surface of the wedge member inserted in the tool rotation direction front side of the mounting seat and the wall surface of the mounting seat facing the tool rotation direction front side. Has been.

  An adjustment wedge for adjusting the position of the cutting insert is provided on the rear end side of the tool body of the mounting seat, and a fixing screw for fixing the position of the adjustment wedge is screwed from the bottom surface of the tool body. ing. In the milling cutter of this configuration, the wedge member is pulled out and the cutting insert is moved so that the cutting insert is inserted, and the adjustment wedge is inserted to press the surface of the cutting insert facing the rear end side of the tool body to move the position of the cutting insert. Thus, the amount of deflection of the cutting blade is adjusted.

In Patent Document 2, a cutting insert and a support member that supports a side surface of the cutting insert facing the rear end side of the tool body are arranged on the mounting seat, and two wedge members are provided on the front side in the tool rotation direction of the mounting seat. Milling cutters have been proposed in which the support members and the cutting insert are fixed to each other in such a manner that they are arranged in tandem.
Utility Model Registration No. 1854538 Japanese Patent Laid-Open No. 62-287908

  By the way, when applying the adjustment mechanism of the amount of deflection of the cutting blade as disclosed in Patent Document 1 to the milling cutter in which the support member and the cutting insert are respectively fixed by the wedge members as in Patent Document 2, The support member needs to be moved together with the cutting insert, and the cutting insert is moved in a state where the two wedge members are extracted to adjust the amount of swing of the cutting blade.

  A plurality of wedge members will be extracted, and the position of the support member and the cutting insert is likely to shift, and the position adjustment of the cutting insert may not be performed accurately. It takes a lot of time and labor, and it becomes impossible to adjust accurately.

  The present invention has been made in view of the above circumstances, and provides a milling cutter capable of easily and surely adjusting the position of a cutting insert and obtaining high cutting edge runout accuracy. With the goal.

  In order to solve this problem, the present invention has a disk-shaped tool body rotated about an axis, and a mounting seat is provided in a recess formed on the outer periphery of the tip of the tool body. A milling cutter to which a cutting insert having a cutting edge is detachably mounted, and the mounting seat is provided with an adjusting member for adjusting the position in the axial direction by moving the cutting insert, The adjusting member has a main body portion and a pressing portion that presses the cutting insert, and a slit is formed between the main body portion and the pressing portion, and the pressing portion is provided at a base portion of the slit in the main body portion. And a first wedge member for fixing the main body portion of the adjustment member and a second wedge member for fixing the cutting insert are disposed on the tool body. It is characterized in that there.

  In the milling cutter having this configuration, an adjustment member having a pressing portion that presses the cutting insert and a main body portion is disposed on the mounting seat, and the main body portion of the adjustment member is fixed by the first wedge member, and the main body portion Since a pressing screw for elastically deforming the pressing portion is disposed in the main body portion, a slit is formed between the pressing portion and the pressing portion, so that only the pressing portion is elastic without removing the first wedge member fixing the adjusting member. It can be deformed. Therefore, in a state where only the second wedge member for fixing the cutting insert is extracted, the cutting insert can be pressed by the pressing portion to adjust the position of the cutting insert, and the vibration adjustment of the cutting edge of the milling cutter can be easily performed. And it can be performed with high accuracy.

  Here, a sheet member having an adjustment member receiving surface on which the adjustment member is seated and an insert receiving surface on which the cutting insert is seated is disposed on the mounting seat, and the adjustment member receiving surface is disposed on the cutting insert. By forming it so as to extend along the moving direction, when the pressing portion of the adjusting member is elastically deformed, the pressing portion moves along the adjusting member receiving surface, and the cutting insert is reliably moved in the moving direction. It can be pressed and moved toward

  Furthermore, when the sheet member is made of a cemented carbide, the cutting resistance can be received by the sheet member, and damage to the cutting insert due to the cutting resistance can be prevented. Moreover, it is not necessary to increase the thickness of the cutting insert in order to ensure the rigidity of the cutting insert, and the usage cost of the cutting insert can be reduced.

  ADVANTAGE OF THE INVENTION According to this invention, the position adjustment of a cutting insert can be performed easily and reliably, and the milling cutter which can obtain high cutting blade runout accuracy can be provided.

Embodiments of the present invention will be described with reference to the accompanying drawings. 1 to 4 show a milling cutter which is an embodiment of the present invention.
The milling cutter 10 has a tool main body 11 made of steel or the like and having an outer shape that is substantially disk-shaped. The tool main body 11 is attached to the center of the disk formed by the tool main body 11 via an adapter. An attachment hole 12 for attachment to the spindle end or the like is formed along the axis O of the tool body 11.

  A plurality of recesses 13 are formed on the outer peripheral surface of the tool main body 11 so as to open to the outer peripheral surface and the front end surface of the tool main body 11. Each of the mounting seats 14 is provided. In the present embodiment, as shown in FIG. 2, the eight concave portions 13 and the mounting seats 14 are provided so as to be spaced apart in the circumferential direction.

  The mounting seat 14 has a wall surface 14 </ b> A that faces the front side in the tool rotation direction T and a wall surface 14 </ b> B that faces the outer side in the radial direction of the tool body 11, and these wall surfaces 14 </ b> A and 14 </ b> B Arranged to reach up to. As shown in FIGS. 3 and 4, the wall surface 14 </ b> A facing the tool rotation direction T front side of the mounting seat 14 gradually recedes toward the rear side of the tool rotation direction T as it goes toward the tip end side of the tool body 11, and The tool body 11 is formed so as to incline so as to recede toward the rear side in the tool rotation direction T as it goes outward in the radial direction of the tool body 11.

  Further, on the front side in the tool rotation direction T of the mounting seat 14, a wedge receiving groove 15 is formed that is recessed from the wall surface 14 </ b> B facing the tool body 11 diametrically outward of the mounting seat 14 toward the inside of the one-stage tool body 11 diametrically. Similarly to the mounting seat 14, the wedge receiving groove 15 is also arranged so as to open to the front end surface of the tool body 11 and reach the rear end side. Therefore, as shown in FIG. 3 when the mounting seat 14 is viewed from the side, the mounting seat 14 and the wedge receiving groove 15 are arranged so as to be aligned in the tool rotation direction T and so as to extend in parallel to each other.

  A seat member 20 made of cemented carbide is disposed on the mounting seat 14. As shown in FIG. 3, the sheet member 20 is substantially L-shaped when viewed from the side, and is formed so that one surface has a two-step shape, and the other surface is flat. Is formed. Here, one surface of the thin portion of the sheet member 20 is an adjustment member receiving surface 21, and one surface of the portion whose thickness is one step thicker than the adjusting member receiving surface 21 is the insert receiver. The surface 22 is used.

  A cutting insert 30 is arranged on the front side in the tool rotation direction T of the insert receiving surface 22 of the sheet member 20. The cutting insert 30 in the present embodiment is made of a hard material such as cemented carbide, and has an outer shape of a substantially square flat plate, and has two square surfaces 31 and four side surfaces. The square surface 31 is a rake face, a cutting edge 32 is formed on a side ridge of the square surface 31, and a side surface connected to the cutting edge 32 is a relief surface. This is a so-called negative type cutting insert 30 that is not provided with corners and is formed so that a square surface 31 that is a rake face and a side surface that is a flank face are orthogonal to each other.

  The adjustment member 40 has a substantially flat plate shape as shown in FIGS. 3 and 4. The thickness of the adjustment member 40 is the same as the thickness of the cutting insert 30, and the adjustment member receiving surface 21 of the insert receiving surface 22 of the sheet member 20. It is said that the protruding height from is added. That is, the thickness of the adjustment member 40 is added to the thickness of the adjustment member receiving surface 21 portion of the sheet member 20 and the thickness of the cutting insert 30 is added to the thickness of the insert receiving surface 22 portion of the sheet member 20. It is formed so that the thing is substantially the same.

The adjustment member 40 is integrally formed with a main body 41 and a pressing portion 42, and a slit 43 is formed so as to divide the main body 41 and the pressing portion 42. The slit 43 is formed so as to penetrate in the thickness direction of the adjustment member 40, and is arranged so that the size of the pressing portion 42 is smaller than that of the main body portion 41. Accordingly, the pressing portion 42 is configured to bend by being elastically deformed with the base portion of the slit 43 as a fulcrum.
A screw hole 44 penetrating from the slit 43 portion to one end surface of the adjustment member 40 is formed in the main body 41, and a pressing screw 45 is screwed into the screw hole 44. The front end surface of the pressing screw 45 is in contact with the slit surface of the pressing portion 42.

The sheet member 20, the cutting insert 30, and the adjustment member 40 having such a configuration are mounted on the mounting seat 14 as follows.
First, the planar surface of the seat member 20 is disposed so as to be seated on the wall surface 14A facing the front side in the tool rotation direction T of the mounting seat 14, and as shown in FIGS. The surfaces of the surface 21 and the insert receiving surface 22 facing the front side in the tool rotation direction T are arranged so as to be parallel to the wall surface 14A of the mounting seat 14 facing the front side in the tool rotation direction T. In other words, the adjustment member receiving surface 21 of the sheet member 20 is disposed along the moving direction of the cutting insert 30.

  The adjustment member 40 is disposed on the surface of the adjustment member receiving surface 21 of the sheet member 20 facing the front side in the tool rotation direction T. In this state, the first wedge member 50 is inserted into the upper portion of the wedge receiving groove 15, and the wall surface 14 </ b> A of the first wedge member 50 facing the tool rotation direction T rear side and the mounting seat 14 facing the tool rotation direction T front side. The adjustment member 40 and the sheet member 20 are sandwiched between and fixed. The first wedge member 50 is provided with a clamp screw 52 for moving the first wedge member 50 so as to be able to advance and retract in the radial direction of the tool body 11.

  Here, the surface of the first wedge member 50 facing the rear side in the tool rotation direction T is in contact with the main body 41 of the adjustment member 40, and the slit 43 and the pressing portion 42 are not in contact with the first wedge member 50. Yes. In other words, the adjustment member 40 is fixed with only the main body portion 41 being sandwiched, and the slit 43 and the pressing portion 42 are not fixed. Moreover, the adjustment member 40 is arrange | positioned so that the slit 43 may open toward the tool main body 11 radial direction outer side.

  Then, the cutting insert 30 is arranged so that one square surface 31 of the cutting insert 30 is in contact with the surface of the insert receiving surface 22 of the sheet member 20 facing the front side in the tool rotation direction T, and after the tool body 11 of the cutting insert 30. The second wedge member 51 is inserted into the lower portion of the first wedge member 50 in the wedge receiving groove 15 with the side surface 33 facing the end side being in contact with the pressing portion 42 of the adjustment member 40. The cutting insert 30 and the sheet member 20 are sandwiched and fixed between the surface of the second wedge member 51 facing the tool rotation direction T rear side and the wall surface 14A of the mounting seat 14 facing the tool rotation direction T front side. The second wedge member 51 is provided with a clamp screw 52 for moving the second wedge member 51 so as to be movable forward and backward in the radial direction of the tool body 11.

  The 2nd wedge member 51 and the 1st wedge member 50 are arrange | positioned so that it may mutually contact and may be arranged in a row. A cutout portion 53 is formed in an upper portion of the surface of the second wedge member 51 facing the rear side in the tool rotation direction T so that the pressing portion 42 of the adjustment member 40 and the second wedge member 51 do not come into contact with each other. Has been. That is, the pressing portion 42 of the adjustment member 40 is not fixed by the second wedge member 51.

  In this way, the cutting insert 30 is mounted on the mounting seat 14. Here, the cutting insert 30 is a negative type cutting insert 30, and the wall surface 14 </ b> A facing the front side of the tool rotation direction T of the mounting seat 14 gradually moves backward toward the rear side of the tool rotation direction T as it goes to the tip side of the tool body 11. The surface of the insert receiving surface 22 of the seat member 20 that is inclined with respect to the axis O and faces the front side in the tool rotation direction T is disposed in parallel to the wall surface 14A. 30 is arranged so that the axial rake angle is on the negative side as shown in FIG. Similarly, the wall surface 14A of the mounting seat 14 facing the front side in the tool rotation direction T is formed so as to incline so as to gradually recede toward the rear side in the tool rotation direction T as it goes outward in the radial direction of the tool body 11. As shown in FIG. 4, the radial rake angle is also set to the negative side.

  In the milling cutter 10 configured in this way, the mounting bolt is inserted into the mounting hole 12 of the tool body 11, and the tip of the mounting bolt is screwed into the adapter, whereby the tool body 11 is connected to the adapter, and the tool body 11 is attached to the spindle end of the machine tool via an adapter, is rotated at high speed in the tool rotation direction T around the axis O, and is fed in a direction crossing the axis O, whereby the tool of the cutting insert 30 The workpiece is cut by the outer peripheral cutting edge 32 directed outward in the radial direction of the main body 11 and the front cutting edge 32 directed toward the distal end side of the tool main body 11.

In the milling cutter 10 of this configuration, the deflection adjustment of the cutting blade 32 is performed by pressing the pressure screw 45 in a state in which only the second wedge member 51 is slightly extracted while the first wedge member 50 holding the adjustment member 40 is inserted. By screwing in.
When the second wedge member 51 is pulled out slightly toward the outside in the radial direction of the tool body 11, the clamping force for clamping and fixing the cutting insert 30 is slightly reduced. When the pressing portion 42 is pressed with the tip of the pressing screw 45 by screwing 45, the pressing portion 42 elastically deforms with the base portion of the slit 43 as a fulcrum and presses the side surface 33 facing the rear end side of the tool body 11 of the cutting insert 30. Will do. Here, the cutting insert 30 is protruded toward the distal end side of the tool body 11 by pressing with a force that opposes the clamping force of the cutting insert 30.

  As described above, according to the milling cutter 10 of the present embodiment, when adjusting the deflection of the cutting blade 32, the second wedge member while firmly holding the main body portion 41 of the adjustment member 40 by the first wedge member 50. Since only 51 can be adjusted in a slightly extracted state, the deflection adjustment of the cutting edge 32 of the milling cutter 10 can be easily and accurately performed.

  Further, the seat member 20 having the adjustment member receiving surface 21 and the insert receiving surface 22 is disposed on the mounting seat 14, and the adjustment member receiving surface 21 is formed to extend along the moving direction of the cutting insert 30. Therefore, the pressing portion 42 can be elastically deformed along the adjusting member receiving surface 21 to press and move the side surface 33 facing the rear end side of the tool body 11 of the cutting insert 30, and the deflection of the cutting blade 32 can be adjusted. Furthermore, it can be performed reliably.

  Further, since the sheet member 20 is made of a cemented carbide, the rigidity of the sheet member 20 is increased, and the cutting force can be received by the sheet member 20. Therefore, even if the thickness of the cutting insert 30 is not increased in order to ensure the rigidity of the cutting insert 30, the cutting insert 30 can be prevented from being damaged or broken, and the usage cost of the cutting insert 30 can be reduced.

Next, a second embodiment of the present invention will be described. 5 and 6 show a milling cutter 10 according to a second embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the member same as 1st Embodiment, and detailed description is abbreviate | omitted.
In the present embodiment, the shape of the cutting insert 30 attached to the mounting seat 14 is different. That is, in the second embodiment, a so-called positive type cutting insert 30 in which a clearance angle is given to a clearance surface continuous with the cutting blade 32 is used.

  In order to apply the positive type cutting insert 30, in the present embodiment, the wall surface 14A facing the front side in the tool rotation direction T of the mounting seat 14 is directed toward the rear end side of the tool body 11 as shown in FIG. It is inclined with respect to the axis O so as to gradually move backward in the tool rotation direction T, and the wedge housing groove 15 is also arranged so as to be inclined with respect to the axis O. Further, the pressing portion 42 of the adjustment member 40 is shaped to abut against a wall surface facing the rear end side of the tool body 11 of the cutting insert 30.

In the milling cutter 10 having this configuration, the positive type cutting insert 30 is used. However, as in the first embodiment, the runout adjustment of the cutting blade 32 can be easily and reliably performed.
Further, since the positive type cutting insert 30 is used as the cutting insert 30, the cutting insert 30 can be mounted with both the axial rake angle and the radial rake angle as the positive side as shown in FIGS. Cutting resistance at the time of cutting can be reduced and cutting can be performed satisfactorily.

As mentioned above, although the milling cutter which is embodiment of this invention was demonstrated, this invention is not limited to this, It can change suitably in the range which does not deviate from the technical idea of the invention.
For example, although the sheet member is described as being disposed, the present invention is not limited to this, and the sheet member may not be disposed.

In addition, although it has been described that the adjusting member is arranged so that the slit of the adjusting member opens toward the outer side in the tool body radial direction, the present invention is not limited to this, and the slit is directed toward the inner side in the tool body radial direction. The adjustment member may be arranged so as to open.
Further, the wedge receiving groove has been described as being formed so as to penetrate from the front end surface of the tool body to the rear end side, but the wedge member is inserted and the cutting insert, the adjustment member, etc. are sandwiched and fixed. Just do it.

Moreover, although the cutting insert was demonstrated as what makes a square flat plate shape, it is not limited to this, What is necessary is just what is clamped and fixed by the 2nd wedge member.
Moreover, although it demonstrated as what provided the recessed part and the mounting seat 8 each in the circumferential direction, there is no limitation in the number and arrangement | positioning of a recessed part and a mounting seat, and it can set suitably in consideration of a workpiece, cutting conditions, etc. preferable.

It is side surface sectional drawing of the milling cutter which is the 1st Embodiment of this invention. It is a bottom view of the milling cutter shown in FIG. It is a side enlarged view of the mounting seat of the milling cutter shown in FIG. FIG. 4 is a view in the direction of the arrow X in FIG. 3. It is a side enlarged view of the mounting seat of the milling cutter which is the 1st Embodiment of this invention. FIG. 6 is a view in the direction of arrow X in FIG. 5.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Milling cutter 11 Tool main body 13 Recessed part 14 Mounting seat 15 Wedge accommodation groove 20 Sheet member 21 Adjusting member receiving surface 22 Insert receiving surface 30 Cutting insert 32 Cutting blade 40 Adjusting member 41 Main body part 42 Pressing part 43 Slit 45 Pressing screw 50 First Wedge member 51 Second wedge member

Claims (3)

It has a disk-shaped tool body that rotates about its axis, and a mounting seat is provided in the recess formed on the outer periphery of the tip of the tool body. A cutting insert having a cutting edge is detachably mounted on the mounting seat. A milling cutter,
The mounting seat is provided with an adjusting member for adjusting the position in the axial direction by moving the cutting insert,
The adjusting member includes a main body portion and a pressing portion that presses the cutting insert, and a slit is formed between the main body portion and the pressing portion, and the pressing portion is attached to the base of the slit in the main body portion. A pressing screw that elastically deforms the part as a fulcrum is provided,
A milling cutter, wherein a first wedge member for fixing the main body portion of the adjustment member and a second wedge member for fixing the cutting insert are arranged in the tool body.   The mounting seat is provided with a sheet member having an adjustment member receiving surface on which the adjustment member is seated and an insert receiving surface on which the cutting insert is seated, and the adjustment member receiving surface is the cutting insert. The milling cutter according to claim 1, wherein the milling cutter is disposed so as to extend along a moving direction of the cutter.   The milling cutter according to claim 2, wherein the sheet member is made of cemented carbide.

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