JP2001259918A - Milling cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate forming of a cutter body, to prevent the breakage of the cutter body caused by a cutting load and the like, and to sufficiently ensure the mounting rigidity of a cutting edge block. SOLUTION: On an outer peripheral surface of a generally plate-shaped cutter body 1, a plurality of cutting edge blocks 5, etc., provided with cutting edges 14A on outer peripheral sides are detachably mounted over the whole outer peripheral surface of the cutter body 1 while spacing in a circumferential direction. A space part G defined between end surface 6B and 6C opposite to each other of the cutting edge blocks 5 adjacent to each other in the circumferential direction is gradually narrowed toward an inner peripheral side, and a wedge member 17 decreased in thickness toward the inner peripheral side is laid in the space part G.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a milling cutter for cutting a work material with a cutting blade provided on an outer peripheral portion thereof.

[0002]

2. Description of the Related Art Milling cutters of this kind include:
A plurality of chip pockets are formed at equal intervals in the circumferential direction on the outer peripheral portion of the disk-shaped cutter main body that is rotated around the axis, and the tip mounting seats formed behind these chip pockets in the cutter rotation direction are thrown. Away chip (hereafter,
Called a chip. ) Protrudes the cutting edge to the outer peripheral side,
There is known a so-called throw-away type side cutter which is detachably attached via a supporter or the like.
In particular, as a cutter for cutting an engine crankpin, a so-called pin mirror cutter, in which the above-mentioned tips are arranged in a staggered manner and the cutting edges of the cutter protrude from both side surfaces of the cutter body. It has been known.

[0003]

By the way, in such a milling cutter, the size of the milling cutter, that is, the outer diameter of the cutting blade around the axis and the rotation of each cutting blade around the axis, are determined according to the object to be machined. The width of the entire trajectory in the axial direction (cutting width) is various. For example, in the case of the above-mentioned pin mirror cutter or the like for cutting the crankpin of a ship engine, the outer diameter of the trajectory is several meters. There is. However, in such a cutter having a large outer diameter, as the depth of cut and feed during the cutting process increase, the volume of the chips generated by the cutting edge also increases, and an excessive cutting load acts on the cutting edge. And
In some cases, the cutter body together with the tip mounting seat may be damaged. There is also a problem that it is difficult to form a cutter body of such a milling cutter having a large outer diameter integrally with high accuracy.

[0004] On the other hand, even if such a large load acts, a cutting blade is provided on the outer periphery of the cutter body to prevent damage to the cutter body and to facilitate formation of the cutter body. It is conceivable that the cutting blade block provided is detachably attached to keep the outer diameter of the cutter body itself small, and that even if damage occurs, it is suppressed to the cutting blade block so as not to reach the cutter body. . However, in such a case where the cutting blade block is detachably attached to the outer periphery of the cutter body,
It is difficult to secure sufficient mounting rigidity of the cutting blade block, and there is a problem in that the cutting accuracy causes the rattling of the cutting blade block due to a cutting load, thereby impairing the processing accuracy.

The present invention has been made in view of such circumstances, and even in the case of a milling cutter having a large outer diameter as described above, the cutting blade block is detachably attached to the outer periphery of the milling cutter. An object of the present invention is to provide a milling cutter capable of easily forming a main body and preventing damage due to a cutting load or the like from reaching the cutter main body, while ensuring sufficient rigidity of mounting the cutting blade block. I have.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems and to achieve such an object, the present invention provides a cutter body having a substantially flat plate-like shape provided with a cutting blade on an outer circumferential side on an outer circumferential surface. A plurality of cutting blade blocks are attached at intervals in the circumferential direction and removably around the entire outer peripheral surface of the cutter body, between the mutually facing end faces of the cutting blade blocks adjacent in the circumferential direction. Is gradually narrowed toward the inner peripheral side, and a wedge member which becomes thinner toward the inner peripheral side is interposed in the gap.

Therefore, according to the milling cutter configured as described above, the cutting blade is provided on the cutting blade block detachably attached to the outer periphery of the cutter body.
The size of the cutter body itself is kept small to facilitate its manufacture, and even if damage is caused by a large cutting load, it can be prevented from reaching the cutter body. With the wedge member interposed therebetween, each cutting blade block can be mounted in a state of being pressed in the circumferential direction over the entire circumference of the cutter body, and its mounting rigidity can be secured.

Here, a flat plate may be interposed together with the wedge member in the gap, so that even if an excessive load is applied to the cutting blade block during cutting, the wedge member may be removed. Can be prevented from directly affecting the wedge member. Further, if a key is interposed between the outer peripheral surface of the cutter body and the cutting blade block, the mounting rigidity of the cutting blade block can be further improved.

[0009]

FIG. 1 to FIG. 3 show an embodiment of the present invention. In the present embodiment, the cutter main body 1 has a substantially disk-shaped flat plate shape centered on the axis O as shown in FIG. 1, and its outer peripheral surface is centered on the axis O as shown in FIG. 2. Are formed by a plurality (many) of flat surfaces 1A having the same shape and the same size that are in contact with the circle. Therefore, the cutter body 1 is strictly symmetric with respect to the axis O corresponding to the number of the flat surfaces 1A. The flat surfaces 1A, 1A adjacent to each other in the circumferential direction cross each other at an obtuse angle while having a rectangular flat plate shape. In the center of the cutter body 1 is also formed a circular mounting hole 2 centered on the axis O, and the cutter body 1 is mounted on the main spindle of the machine tool through the mounting hole 2. Then, it is rotated in the rotation direction indicated by the symbol T in the figure and is provided for cutting.

Each of the flat surfaces 1A has an axis O at a substantially central portion in the circumferential direction of the cutter body 1 for each flat surface 1A.
The keyway 3 extending in the direction of FIG.
At the center in the direction, key grooves 4 extending in the circumferential direction are formed so as to form a U-shaped cross section and open to the flat surface 1A, and cross each other crosswise as viewed from the outer peripheral side of the cutter body 1. Is formed. Of these, the key grooves 3 extending in the direction of the axis O are provided on both side surfaces 1B and 1C of the cutter body 1.
And the key grooves 4 extending in the circumferential direction are formed at both ends of each flat surface 1A in the circumferential direction, that is, at one flat surface 1A and on both sides thereof. Intersecting ridge line 1 with adjacent flat surfaces 1A, 1A
D and 1D have not reached any of them, and a slight space is left between these intersection ridges 1D and 1D.
Flat surface 1A without being continuous in the circumferential direction of cutter body 1
Each is formed separately.

On the outer peripheral surface of the cutter body 1 composed of such flat surfaces 1A, the same number of cutting blade blocks 5 as the flat surfaces 1A are detachably attached to each flat surface 2. . When the cutting block 5 is mounted on the flat surface 1A, the cutting blade block 5 has a rectangular flat mounting portion 6 that is in close contact with the flat surface 1A, and a cutting blade holding portion 7 that protrudes from the mounting portion 6 toward the outer periphery. The mounting portion 6 that is in close contact with the flat surface 1A has a width in the direction of the axis O of the bottom surface 6A equal to the width of the flat surface 1A and a circumferential length. Is shorter than the flat surface 1A and is equal to the length of the key groove 4, and the key grooves 8, 9 having the same width as the key grooves 3, 4 are formed on the bottom surface 6A. As shown in the figure, it is also formed crossing the cross. A side surface 6B of the mounting portion 6 facing the rotation direction T side and a side surface 6C facing the rotation direction T rear side are parallel to each other and also to the axis O. It is formed vertically, that is, perpendicular to the flat surface 1A.

On the other hand, as shown in FIG. 2, the cutting blade holding portion 7 of the cutting blade block 5 has a trapezoidal shape whose width in the circumferential direction becomes gradually narrower toward the outer periphery as shown in FIG. When viewed from the side, as shown in FIG. 3, the cutter body 1 is formed to be inclined with respect to the axis O from one side surface 1B to the other side surface 1C toward the rear side in the rotation direction T as shown in FIG. . An end face 7A facing the outer peripheral side of the cutting blade holding portion 7 and a side face 7 facing the rotation direction T side.
The supporter mounting seats 10 are provided at each of the ridges at the intersection with B.
The supporters 12 each having a chip mounting seat 11 are detachably mounted on the supporter mounting seats 10 by a supporter clamp screw 13. At the same time, the tip mounting seat 11 of the supporter 12 includes
The tip 14 has the one cutting edge 14A protruding outward from the end face 7A of the cutting edge holding portion 7 and toward the rotation direction T from the side face 7B, and is also detachably attached.

In this embodiment, the supporter mounting seats 10, which are formed two by two on the cutting blade holder 7 of one cutting blade block 5, are the cutting blades adjacent in the circumferential direction of the cutter body 1. The blocks 5, 5 are formed so as to be displaced from each other in the direction of the axis O, that is, as shown in FIG. 3, one of the cutting blade blocks 5 (the center cutting block 5 in FIG. In the left cutting blade block 5), these supporter mounting seats 10 are formed so as to be biased toward the one side 1B side of the cutter body 1 and the other side 1C side from the center in the thickness direction. The other cutting edge block 5 adjacent to this one cutting edge block 5
(The left and right cutting blade blocks 5 in FIG. 2 and the right cutting blade block 5 in FIG. 3).
Reference numeral 10 is formed so as to be biased toward the other side surface 1C of the cutter body 1 and one side surface 1B from the center in the thickness direction. And, with this, these supporter mounting seats 10
Are also displaced in the direction of the axis O, and the rotational trajectory around the axis O of the displaced cutting edges 14A is also in the direction of the axis O. The working surface of the work material is cut entirely.

As shown in FIG. 3, the side surface 7B of the cutting blade holder 7 which faces the rotation direction T has a stepped shape which is uneven according to the inclination of the cutting blade holder 7 as viewed from the outer peripheral side. The supporter mounting seat 10 is formed in the step thus formed, and the thickness of the supporter mounting seats 10 and 10 of the one cutting blade block 5 and the thickness of the other cutting blade block 5 is formed. The supporter mounting seat 10 at the center in the direction has a wall surface 10A that faces the side surface 1B of the cutter body 1 and holds the supporter 12. The side surface 7B of the cutting blade holding portion 7 facing the rotation direction T is inclined such that the wall surface 7C facing the opposite rotation direction T rearward faces the rotation direction T at a larger inclination angle toward the outer peripheral side. On the other hand, it is formed so as to extend toward the rear side in the rotation direction T as it goes to the outer peripheral side at a smaller inclination angle, that is, to extend in the radial direction with respect to the axis O.

Further, the supporters 12... And the chips 14
Are common to each other, each of which has a flat plate shape, and is attached so that its thickness direction is directed to the radial direction of the cutter body 1. Of these, supporters 12
Has a substantially rectangular flat plate shape, and is seated on the supporter mounting seat 10 so that the longitudinal direction thereof is along the circumferential direction of the cutter body 1, and the outer peripheral portion is provided on the rear side in the rotation direction T. The supporter clamp screw 13 inserted from the side is screwed into the bottom surface of the supporter mounting seat 10 to be attached to the cutting blade holder 7. Further, the chip mounting seat 11 is provided with the supporter 1 thus mounted.
2 is formed at the corner on the side surface 1B side on the rotation direction T side. Therefore, the chip mounting seat 11 is also formed with a wall surface 11A facing the side surface 1B and holding the chip 14.

On the other hand, the tip 14 is a negative tip made of a hard material such as a cemented carbide or the like in the shape of a square flat plate, and the cutting edge 14A is provided on all eight side edges.
Are formed, and one of them is selectively protruded toward the outer peripheral side and the rotation direction T side as described above, and is subjected to cutting. It is to be noted that all of the chips 14 are arranged such that the one cutting edge 14A used for the cutting is the one side surface 1B of the cutter body 1.
Is mounted on the tip mounting seat 11 so as to be slightly inclined toward the rotation direction T from the side toward the other side surface 1C, and the one of the cutting blade blocks 5
Cutting edge 14A of tip 14 attached to side 1B
Are arranged such that their ends protrude slightly outward from the side surface 1B.

The cutting blade block 5 to which the supporter 12 and the tip 14 are attached in this manner is provided with an attachment portion such that the key grooves 8, 9 and the key grooves 3, 4 are matched via the keys 15. 6 are fixed to the flat surface 1A, and the block clamp screws 16 which are inserted into the mounting portion 6 from the outer peripheral side are screwed into the flat surface 1A. Mounted as possible. However, since the length of the mounting portion 6 in the circumferential direction is shorter than the length of the flat surface 1A as described above, the circumferential direction of the mounting portion 6 in the state where the cutting block 5 is mounted on the flat surface 1A is thus reduced. The side surface 6B of the mounting portion 6 of the cutting blade block 5 located on the rear side in the rotation direction T and the mounting of the cutting blade block 5 located on the rotation direction T side between the adjacent cutting blade blocks 5 and 5. Between the flat surface 1A and the flat surface 1A between the side surface 6C of the portion 6;
D is sandwiched therebetween, and a gap G is defined.
The adjacent flat surfaces 1A, 1A intersect each other at an obtuse angle and the side surfaces 6B, 6C are perpendicular to the flat surfaces 1A, 1A. Are formed so as to extend in an intersecting direction at an acute angle, that is, such that the circumferential width between the side surfaces 6B and 6C is gradually reduced.

In the gap G, a wedge member 17 is provided on the side surface 6B facing the rotation direction T side from the intersection ridgeline 1D, and in this embodiment, on the side surface 6C side facing the rear side in the rotation direction T. Plates 18 are interposed respectively. The wedge member 17 includes the side surface 6B,
6C is a long plate-like member having a pair of side surfaces 17A, 17B extending in a direction intersecting at an angle equal to the acute intersection angle formed by 6C, and having a trapezoidal cross section orthogonal to the axis O. In the direction where 16B crosses,
It is formed such that its thickness in the circumferential direction becomes gradually thinner.
On the other hand, the plate 18 is a plate-shaped (long plate) -shaped member having a rectangular cross section orthogonal to the axis O, and has a wall thickness of the mounting portion 6 of the cutting blade block 5 mounted on the flat surface 1A. The length is equal to the length from the side surface 6C to the intersection ridgeline 1D and has a uniform thickness.

The plate 18 thus formed has one wide side surface extending in the longitudinal direction (the direction of the axis O) in close contact with the side surface 6C of the mounting portion 6 of the cutting block 5 and also has a longitudinal direction. The extended narrow side surface 1 is brought into close contact with the flat surface 1A from the side surface 6C to the cross ridge line 1D, and the plate clamp screws 19, 19 inserted into the plate 18 are screwed vertically into the flat surface 1A. The gap G is attached to the rotation direction T side.
With the plate 18 thus attached, the portion of the gap G on the rear side in the rotation direction T is still formed so as to become narrower toward the inner peripheral side, and the wedge member 17 is attached to this portion. The direction in which the wall thickness becomes thinner is directed toward the inner peripheral side, and the side surfaces 17A and 17B are inserted into the plate 18 and the side surface 6B of the cutting blade block 5 in close contact with each other. The plate 1 is pushed inward by the wedge clamp screws 20 and 20 which are screwed vertically to the flat surface 1A.
8 together with the gap G. The wedge member 17 and the side surface of the plate 18 facing the outer periphery of the plate 18 are substantially smoothly connected to the side surfaces 7B and 7C of the cutting blade holding portions 7 of the adjacent cutting blade blocks 5 and 5 on both sides thereof. To be.

Therefore, in the milling cutter thus configured, the cutting blade 14A is provided on the cutting blade block 5 detachably attached to the outer periphery of the cutter body 1 by the block clamp screw 16. Therefore, even if the outer diameter of the milling cutter, that is, the diameter of rotation of the cutting edge 14A around the axis O is large, the volume of chips generated during cutting is large, and accordingly, an excessive load is applied around the cutting edge 14A. Even if damage is likely to occur, the damage only damages the cutting block 5 provided with the cutting edge 14A, and does not reach the cutter body 1. Therefore, even if such damage occurs, only the damaged cutting blade block 5 needs to be replaced, and the cutting operation can be continued promptly, which is efficient and economical. In addition, since the cutting blade block 5 holding the cutting blade 14A is separate from the cutter body 1, even if the outer diameter is larger than the case where these are integrated, the individual cutting blades can be formed. The size of the block 5 and the cutter body 1 itself can be kept small, which facilitates the production and improves the molding accuracy.

On the other hand, in the milling cutter having the above-described configuration, all the cutting blade blocks 5 and 5 attached to the outer periphery of the cutter body 1 in the circumferential direction.
A wedge member 17 is interposed in the gap G between the members, and the wedge member 17 is pushed inward by a wedge clamp screw 20 so that the cutting blade blocks 5 attached to the outer periphery of the cutter body 1. Is pressed from both sides in the circumferential direction. For this reason, even if the cutter body 1 and the cutting blade blocks 5 are formed separately as described above and the milling cutter is configured by combining them, the cutting blade blocks 5 are firmly connected. It is possible to secure high mounting rigidity by holding, and even in the case where the outer diameter of the cutting edge 14A is large and an excessive cutting load is likely to occur, it is possible to prevent the cutting edge block 5 from rattling and to achieve high cutting rigidity. Accurate processing can be achieved.
In this embodiment, the wedge members 17 are interposed between all the cutting blade blocks 5 adjacent in the circumferential direction, and the wedge members 17 are adjusted by adjusting the screwing amounts of the wedge clamp screws 20. By adjusting the amount by which the cutting blades 5 are pushed into the inner peripheral side, the pressing force with which each of the cutting blade blocks 5 is pressed in the circumferential direction can be made uniform to easily balance the mounting rigidity.

In the case where the cutter main body 1 and the cutting blade blocks 5 are formed separately and integrated with the milling cutter in this way, if the outer diameter of the milling cutter is too small, it is formed separately. Not only will the effect described above not be fully exhibited,
A screw hole for attaching a block clamp screw 16 for attaching the cutting blade block 5, a screw hole for attaching a plate clamp screw 19 and a wedge clamp screw 20, or key grooves 3 and 4 are formed. As a result, the thickness of the cutter body 1 may be deviated more than necessary compared to its size, and the rigidity of the cutter body 1 itself may be impaired. Therefore,
Such a configuration is more preferably applied to a milling cutter having a large outer diameter, and more specifically, to a milling cutter having an outer diameter of 600 mm or more.

On the other hand, in the present embodiment, a flat plate 18 together with the wedge member 17 is interposed in the gap G defined between the cutting blade blocks 5 and 5 adjacent in the circumferential direction. Thus, even when an excessive load occurs during cutting, it is possible to prevent a situation in which the load directly acts on the wedge member 17 from the cutting blade block 5 and damages the wedge member 17. . That is, in the embodiment shown in FIGS. 1 to 3, for example, if such a plate 18 is not provided, a circumferential load at the time of cutting directly acts on the individual wedge members 17 from the cutting blade block 5. Although the wedge member 17 may be damaged even if the cutting blade block 5 is not damaged, the wedge member 17 is also provided by interposing the plate 18 as in the present embodiment. The load can be prevented from being concentrated, and the damage can be prevented. However, the block clamp screws 16 and the keys 15 described below are used.
For example, when the mounting rigidity of the cutting blade block 5 is further sufficiently ensured by, for example, the above-mentioned gap 18 is provided without providing the plate 18 as shown in FIG. 5 of the mounting portion 6 of the side surface 6B, 6
Only the wedge member 17 may be interposed in the gap G so as to be defined between C.

Further, in the present embodiment, the key grooves matching with each other are formed on the flat surface 1A on the outer periphery of the cutter body 1 to which the cutting blade block 5 is mounted and the bottom surface 6A of the mounting portion 6 of the cutting blade block 5. 3, 4 and key grooves 8, 9 are formed, and the keys 15 are fitted in these key grooves 3, 4, 8, 9 so that the keys 15.
The cutting blade blocks 5 are mounted in a state of being interposed between the cutting blade blocks 5. Therefore, the mounting rigidity of the cutting blade block 5 can be more reliably ensured by the keys 15. In particular, in the present embodiment, the key grooves 3, 4, 8, and 9 are formed so as to cross each other. Therefore, not only the key 15 fitted into the key grooves 3 and 8 extending in the direction of the axis O can improve the rigidity against the load acting in the circumferential direction, but also the key grooves 4 extending in the circumferential direction.
Sufficient rigidity can be obtained even with a load acting in the direction of the axis O by the key 15 fitted to the key 9.

In this embodiment, the tip 1 attached to the cutting blade block 5 via the supporter 12 is used.
Cutting edge 14A protruding in the rotation direction T on the outer peripheral side of
Are inclined in the direction of the axis O from the one side surface 1B of the cutter body 1 toward the rotation direction T as viewed from the outer peripheral side toward the other side surface 1C, whereby the cutting edge 14A is cut. Since the cutting is performed while gradually biting into the material, it is possible to prevent an impact load from acting. On the other hand, at the time of cutting, the other side surface 1C is applied to the tip 14 and the supporter 12 due to the inclination of the cutting edge 14A. The load in the direction of the axis O toward the side acts.

On the other hand, in the present embodiment,
The key 15 inserted into the key grooves 4 and 9 extending in the circumferential direction as described above allows the cutting blade block 5 to have sufficient mounting rigidity even with such a load in the direction of the axis O. On the other hand, each of the chips 14 is a wall surface 11A facing the side surface 1B of the chip mounting seat 11 formed on the supporter 12.
And a part of the supporter 12 is also held on the wall surface 11A facing the side surface 1B of the supporter mounting seat 11 formed on the cutting blade holding portion 7 of the cutting blade block 5,
The chip 14 and the supporter 12 can be reliably held even under such a load in the direction of the axis O.

In this embodiment, the side surfaces 7B and 7C of the cutting blade holder 7 of the cutting blade block 5 have the side surfaces 7C facing the rotation direction T rear side more than the side surfaces 7B facing the rotation direction T side. The supporter mounting seat 1 for holding the supporter 12 to which the chip 14 is mounted has a gentle inclination.
Since it is possible to secure a greater thickness in the cutting edge holding portion 7 in the rotation direction T rear side than 0, the cutting edge 1
Higher rigidity can be secured against a circumferential load acting on the rear side in the rotation direction T from 4A. Moreover,
In this manner, the inclination of the side surface 7C facing the rear side in the rotation direction T is made gentle, and the wedge member 17 and the plate 18
Of the cutting blade block 5 is smoothly connected to the side surfaces 7B, 7C of the cutting blade holding portion 7 of the cutting blade block 5, so that the side between the side surfaces 7B, 7C on the rotation direction T side of the cutting blade 14A. Can be formed so that the inner peripheral surface thereof is smoothly connected, and even if a large volume of chips is generated by the cutting blade 14A, the chip can be reliably and smoothly processed. Becomes possible.

[0028]

As described above, according to the present invention,
Providing cutting blades on the cutting blade block detachably attached to the outer periphery of the cutter body makes it easy to manufacture these cutter bodies and cutting blade blocks with high accuracy, and also applies excessive load to this cutting blade during cutting. Can prevent damage and the like from reaching the cutter body,
While being efficient and economical, a wedge member is interposed in the gap defined between the circumferentially adjacent cutting blade blocks, so that the wedge member presses the cutting blade block in the circumferential direction. As a result, the cutting rigidity of the cutting blade block can be secured, and the cutting block can be prevented from rattling or the like, so that high-precision machining can be performed.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is an enlarged side view of the outer peripheral portion of the cutter body 1 of the embodiment shown in FIG.

FIG. 3 is an enlarged view of the cutter body 1 of the embodiment shown in FIG. 1 as viewed from an outer peripheral side.

FIG. 4 is an enlarged side view of an outer peripheral portion of a cutter body 1 showing a modification of the embodiment shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cutter main body 1A Flat surface 3,4,8,9 Keyway 5 Cutting blade block 6 Mounting part of cutting blade block 5 7 Cutting blade holding part of cutting blade block 10 Supporter mounting seat 10A Wall surface of supporter mounting seat 10 11 Chip Mounting seat 11A Wall surface of tip mounting seat 11 12 Supporter 14 Throw-away tip 14A Cutting blade 15 Key 17 Wedge member 18 Plate O Axis line of cutter body 1 T Rotation direction of cutter body 1 during cutting G Gap

Claims (3)

[Claims] 1. A plurality of cutting blade blocks each having a cutting edge on an outer peripheral side are provided on an outer peripheral surface of a substantially flat cutter main body at intervals in a circumferential direction, and are provided around the entire outer peripheral surface of the cutter main body. The gap defined between the mutually facing end faces of the cutting blade blocks adjacent in the circumferential direction is gradually narrowed toward the inner peripheral side. A milling cutter characterized in that a wedge member that becomes thinner toward the inner peripheral side is interposed in the gap. 2. The milling cutter according to claim 1, wherein a flat plate is interposed in the gap along with the wedge member. 3. The milling cutter according to claim 1, wherein a key is interposed between the outer peripheral surface of the cutter body and the cutting blade block.