CN211413807U - Milling cutter - Google Patents

Abstract

The utility model discloses a milling cutter, include: the end face of one end of the cutter handle is provided with an annular mounting surface, the annular mounting surface surrounds the central axis of the cutter handle and extends outwards, and the height of the annular mounting surface is gradually reduced outwards from the central axis of the cutter handle; the blades are attached to the annular mounting surface at intervals along the surrounding direction of the annular mounting surface, each blade is provided with a first end and a second end, the first ends are close to the central axis of the cutter handle, and the second ends are connected to the first ends and extend in the direction departing from the central axis of the cutter handle; each blade is provided with a first cutting surface, the first cutting surface extends from the first end to the second end, and the first cutting surfaces are arranged in the tangential direction facing the rotating direction of the milling cutter. The number of the inserts is increased to increase the cutting efficiency of the milling cutter.

Description

Milling cutter

Technical Field

The utility model relates to a milling process technical field, in particular to milling cutter.

Background

Milling cutters are used for cutting workpieces, mainly for machining planes, steps, grooves, formed surfaces, cutting off workpieces and the like on milling machines. With the development of the times, the requirements of people on milling cutters are higher and higher, and the cutting efficiency of the milling cutter is sacrificed at the same time although the precision of the existing single-edge milling cutter is higher during cutting, particularly when a step surface or a shallow groove is machined on a horizontal milling machine, the requirements on the cutting precision are not high, but the cutting work is difficult to be quickly achieved in the single-edge milling cutter, so that the cutting efficiency is low, and the cost is increased.

The above is only for the purpose of assisting understanding of the technical solutions of the present application, and does not represent an admission that the above is prior art.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a milling cutter aims at increasing the quantity of blade to accelerate milling cutter's cutting efficiency.

In order to achieve the above object, the utility model provides a milling cutter, include:

the end face of one end of the cutter handle is provided with an annular mounting surface, the annular mounting surface surrounds the central axis of the cutter handle and extends outwards, and the height of the annular mounting surface is gradually reduced outwards from the central axis of the cutter handle;

the blades are attached to the annular mounting surface at intervals along the surrounding direction of the annular mounting surface, each blade is provided with a first end and a second end, the first ends are close to the central axis of the cutter handle, and the second ends are connected to the first ends and extend in the direction departing from the central axis of the cutter handle;

each blade is provided with a first cutting surface, the first cutting surface extends from the first end to the second end, and the first cutting surfaces are arranged in the tangential direction facing the rotating direction of the milling cutter.

Optionally, a chip discharge groove is formed in the annular mounting surface, is formed between every two adjacent blades, and is formed by extending the central axis of the cutter handle outwards.

Optionally, the chip groove includes edge first lateral wall and the second lateral wall that the chip groove extending direction set up extend, first lateral wall deviates from a side of installation face connect in the second lateral wall deviates from a side of installation face.

Optionally, an included angle between the first side wall and the central axis of the tool holder is defined as β, and β satisfies: beta is more than or equal to 5 degrees and less than or equal to 45 degrees.

Optionally, an included angle between the first cutting surface and the central axis of the tool holder is defined as α, and α satisfies: alpha is more than or equal to 10 degrees and less than or equal to 60 degrees.

Optionally, the annular mounting surface has a vertical height from the upper surface of the blade of 0.8mm to 1.0 mm.

Optionally, each blade is further provided with a second cutting surface, and the second cutting surface is arranged on the surface of the first end facing the central axis of the handle.

Optionally, each of the blades further includes a guiding plane, the guiding plane is disposed on a surface of the first end facing the central axis of the tool holder, and the guiding plane is disposed between the first cutting surface and the second cutting surface and connected to the first cutting surface and the second cutting surface.

Optionally, each blade is further provided with a top surface and a bottom surface which are arranged oppositely, and the bottom surface is attached to the annular mounting surface;

each the blade still is equipped with first lateral wall face and second lateral wall face, the second lateral wall face is located the second end deviates from the surface of first end, first lateral wall face is located the second lateral wall face with between the second cutting face, and be connected in the second lateral wall face with the second cutting face, first cutting face lead the plane the second cutting face first lateral wall face and the second lateral wall face is followed the circumference of blade encircles the setting in proper order to end connection in proper order, the second cutting face with lead the plane and be the obtuse angle setting, first lateral wall face dorsad first cutting face sets up.

Optionally, the tool holder is made of tungsten steel, and the blade is a cutting piece made of superhard material or superhard composite material.

The utility model discloses technical scheme's milling cutter includes handle of a knife and blade, and the handle of a knife plays the effect of installation blade, and the blade is installed in the one end of handle of a knife for cut workpiece. Specifically, one end of the tool holder is provided with an annular mounting surface, the annular mounting surface surrounds the central axis of the tool holder and extends outwards, and the height of the annular mounting surface is gradually reduced outwards from the central axis. Specifically, the blade outwards extends along the central axis of handle of a knife and sets up and be provided with a plurality of, and annular installation face is located along the direction interval subsides of encircleing of annular installation face to a plurality of blade, and each blade has a first cutting face, and first cutting face is used for contacting with the work piece, and a plurality of first cutting faces all set up towards the tangential direction of milling cutter's direction of rotation, so that process the work piece, so the utility model discloses set up a plurality of blades, can realize when milling cutter is rotatory, a plurality of blades are processed the work piece simultaneously to improve milling cutter's cutting efficiency, reach reduction in production cost's purpose simultaneously.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic structural view of an embodiment of the milling cutter of the present invention;

FIG. 2 is a cross-sectional view of FIG. 1;

FIG. 3 is another perspective view of FIG. 1;

FIG. 4 is an enlarged view of the shank of FIG. 1;

fig. 5 is an enlarged view of the blade of fig. 1.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				100	Milling cutter	121	First end
110	Knife handle	122	Second end
				111	Annular mounting surface	123	First cutting noodles
112	Chip groove	124	Second cutting surface
				1121	First side wall	125	Guide plane
1122	Second side wall	126	First side wall surface
				120	Blade	127	Second side wall surface

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

In the present application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., "fixed" may be fixedly connected or detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout is to include three juxtapositions, exemplified by "A and/or B," including either the A or B arrangement, or both A and B satisfied arrangement. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The utility model provides a milling cutter 100.

As shown in fig. 1 to 5, in the embodiment of the present invention, the milling cutter 100 includes:

the tool holder comprises a tool holder 110, wherein an end face of one end of the tool holder 110 is provided with an annular mounting surface 111, the annular mounting surface 111 surrounds the central axis of the tool holder 110 and extends outwards, and the height of the annular mounting surface 111 is gradually reduced outwards from the central axis of the tool holder 110;

the blades 120 are provided with a plurality of blades 120, the plurality of blades 120 are attached to the annular mounting surface 111 at intervals along the surrounding direction of the annular mounting surface 111, the blades 120 are provided with a first end 121 and a second end 122, the first end 121 is arranged close to the central axis of the tool holder, and the second end 122 is connected to the first end 121 and extends along the direction departing from the central axis of the tool holder;

each of the inserts 120 has a first cutting surface 123, the first cutting surface 123 extends from the first end 121 to the second end 122, and a plurality of the first cutting surfaces 123 are disposed facing a tangential direction of a rotation direction of the milling cutter.

Handle of a knife 110 is rectangular columnar structure, and handle of a knife 110 diameter is by keeping away from annular installation face 111 one end to being close to the one end of sword annular installation face 111 and increase gradually, and blade 120 is installed in the great one end of handle of a knife 110 diameter, and the one end of handle of a knife installation blade 120 has annular installation face 111, and annular installation face 111 is by the outside extension setting of the central axis of handle of a knife, and annular installation face 111 highly reduces by the central axis is outside gradually, is promptly following the direction of height of milling cutter is downward, and follows on the radial outside direction of milling cutter, annular installation face 111 highly reduces gradually, also annular installation face 111 is the inclined plane structure setting, can provide bigger cutter space of dodging when the inclined plane setting cutting, avoids handle of a knife 110 and work piece contact, causes. The blade 120 is attached to the annular mounting surface 111, and the blade 120 extends outward from the central axis of the handle, i.e. the blade 120 extends along the radial direction of the handle, so the blade 120 is a long-strip block-shaped structure and is disposed in an inclined manner. It will be appreciated that the end of the shank receiving the blade 120 is relatively large in diameter to receive a plurality of blades 120 to ensure stability of the blade 120.

The plurality of blades 120 are attached to the annular mounting surface 111 at intervals, and when the milling cutter rotates, the plurality of blades 120 can simultaneously machine a workpiece to enhance the cutting effect. Each blade 120 is provided with a first cutting surface 123, the first cutting surface 123 directly contacts with the workpiece and processes the workpiece, and the first cutting surface 123 extends outwards from the central axis of the tool holder. The upper edge of the cutting face is a main cutting edge, and the milling cutter rotates ceaselessly in the cutting process, so that the workpieces can be processed simultaneously by the aid of a plurality of cutting faces, the plurality of cutting faces are required to be arranged in the tangential direction of the rotation direction of the milling cutter, the workpieces are conveniently processed, and meanwhile, the plurality of blades 120 are arranged, and the processing efficiency of the milling cutter can be improved.

The utility model discloses technical scheme's milling cutter includes handle of a knife and blade 120, and the handle of a knife plays the effect of installation blade 120, and blade 120 is installed in the one end of handle of a knife for cut workpiece. Specifically, one end of the tool holder has an annular mounting surface 111, and the annular mounting surface 111 surrounds the central axis of the tool holder and extends outward, and the height gradually decreases outward from the central axis, it can be understood that the annular mounting surface 111 is a bevel structure, and the blade 120 is attached on the annular mounting surface 111, so the blade 120 is also disposed obliquely. Specifically, blade 120 extends the setting and is provided with a plurality of along the central axis of handle of a knife outward, and annular installation face 111 is located along the direction interval subsides that encircle of annular installation face 111 to a plurality of blade 120, and each blade 120 has a first cutting face 123, and first cutting face 123 is used for contacting with the work piece, and a plurality of first cutting faces 123 all set up towards the tangential direction of milling cutter's direction of rotation, so that process the work piece, so the utility model discloses set up a plurality of blades 120, can realize when milling cutter is rotatory, a plurality of blades 120 process the work piece simultaneously to improve milling cutter's cutting efficiency, reach reduction in production cost's purpose simultaneously.

Optionally, the annular mounting surface 111 is provided with a chip discharge groove 112, and the chip discharge groove 112 is arranged between two adjacent blades 120 and extends outwards from the central axis of the tool holder.

The mounting surface is provided with a plurality of mounting positions for placing the blades 120, the length and the width of each mounting position are equivalent to those of the blades 120, the mounting positions are used for bearing the blades 120, the stability of the blades 120 can be further enhanced through the arrangement of the mounting positions, each mounting position corresponds to one blade 120, the mounting positions are uniformly distributed on the annular mounting surface 111, namely the blades 120 are uniformly distributed on the annular mounting surface 111, and the cutting stability of the milling cutter and the cutting uniformity of workpieces can be improved.

A chip discharge groove 112 is formed between two adjacent blades 120, the chip discharge groove 112 is used for chip breaking and discharging, the height of the chip discharge groove 112 is lower than that of the blades 120, a large amount of chips are generated when the blades 120 cut, and the chips just fall into the chip discharge groove 112 at the moment, and the chips are broken and flow out of the notch of the chip discharge groove 112 under the limitation of the chip discharge groove 112. When the cutting tool is used, the tool shank is fixed on a machine tool, and the first cutting edge of the blade 120 cuts a workpiece, so that cutting machining can be performed. Simultaneously, chip groove 112 can effectively play the effect of chip breaking, chip removal when the cutting, and when blade 120 cut the work piece, the smear metal can contact with chip groove 112, chip groove 112 can take place the friction with the smear metal when the rotatory processing work piece of milling cutter to break the smear metal under the extrusion of work piece, the smear metal of being broken simultaneously can flow through the notch of chip groove 112 both sides, adopt the utility model discloses a chip groove 112 can effectual rupture, changes the length and the shape of smear metal, makes the smear metal advance fast to discharge, avoids the smear metal overlength or stops to cause the damage to machined surface and cutter on the cutter, reaches the purpose that increases the life of cutter.

Optionally, the junk slot 112 includes a first side wall 1121 and a second side wall 1122 that extend along an extending direction of the junk slot 112, and a side of the first side wall 1121 that faces away from the mounting surface is connected to a side of the second side wall 1122 that faces away from the mounting surface.

The first side wall 1121 extends along the circumferential direction of the tool shank, and the facing direction of the first side wall 1121 is away from the tool shank; the second side wall 1122 extends along the length direction of the tool holder, the second side wall 1122 is disposed below the first cutting surface 123 and exposed from the first side wall 1121, the first side wall 1121 is connected to the second side wall 1122 to form the chip discharge groove 112, and the first cutting surface 123 is disposed above the second side wall 1122 and is in the same vertical direction as the second side wall 1122, so that the chip discharge groove 112 can also be understood as being defined by the first side wall 1121, the second side wall 1122 and the first cutting surface 123. Specifically, the second side wall 1122 and the first cutting surface 123 are used for avoiding a workpiece, the workpiece is in contact with the first cutting surface 123 during machining, the second side wall 1122 and the first cutting surface 123 face each other, and the milling cutter machines the workpiece through continuous rotation.

It can understand, first side wall 1121 extends the setting along the circumferential direction of handle of a knife, and faces the direction and deviates from the handle of a knife setting, and first side wall 1121 is the setting of inclined plane structure, and the cutter relieving space when milling cutter cutting can be increased to the inclined plane structure, and second side wall 1122 extends the setting downwards (towards the handle of a knife direction) by first cutting surface 123 to be connected with first side wall 1121, the upper end of second side wall 1122 is connected in first cutting surface 123 promptly, and the lower extreme is connected in first side wall 1121, so the utility model discloses a chip groove 112 is enclosed to close by first side wall 1121, second side wall 1122 and first cutting surface 123 and forms, and first side wall 1121 and second side wall 1122 are the contained angle setting promptly, and chip groove 112 is the setting of "V" type structure. The plurality of flutes 112 may be provided, and the plurality of flutes 112 are spaced apart and staggered with the plurality of blades 120. Since the plurality of blades 120 are provided, the simultaneous provision of the plurality of chip flutes 112 can accelerate the chip discharge efficiency.

Optionally, an included angle between the first side wall 1121 and the central axis of the tool holder is defined as β, then α satisfies: beta is more than or equal to 5 degrees and less than or equal to 45 degrees; defining an included angle between the first cutting surface 123 and the central axis of the tool holder as α, α satisfies: alpha is more than or equal to 10 degrees and less than or equal to 60 degrees.

Specifically, the included angle between the first side wall 1121 and the vertical surface ranges from 5 ° to 45 °, the first side wall 1121 can play a role of guiding chips, and if the included angle between the first side wall 1121 and the vertical surface is too large, the chips are squeezed in the chip removal groove 112, so that a better chip removal effect cannot be achieved. Meanwhile, the first side wall 1121 and the second side wall 1122 (the first cutting surface 123) forming the chip groove 112 also have corresponding angle ranges, which may be between 80 ° and 95 °, and since the blades 120 are disposed above the second side wall 1122 and the number of the blades 120 may be multiple, the size of the included angle between the first side wall 1121 and the second side wall 1122 needs to be set according to the number and the width of the blades 120, but in order to ensure the processing efficiency, at least three blades 120 are disposed, and the three blades 120 are spaced apart from each other in the circumferential direction of the holder, and the width of the three blades 120 is smaller than one third of the circumference of the second side wall 127, so that the included angle between the first side wall 1121 and the central axis of the holder, i.e., the vertical plane, ranges from 5 ° to 45 °. In addition, because the blade 120 is obliquely arranged, the blade 120 forms an included angle with the vertical direction, namely the first cutting surface 123 forms an included angle with the central axis of the knife handle, namely the normal plane of the annular mounting surface 111, and the included angle ranges from 10 degrees to alpha 60 degrees

Optionally, the annular mounting surface 111 has a vertical height of 0.8-1.0mm from the upper surface of the blade 120.

The vertical height of the annular mounting surface 111 from the upper surface of the blade 120 is the thickness of the blade 120, specifically, the height from the top to the bottom of the blade 120 is referred to, the thickness of the blade 120 affects the contact area between the first cutting surface 123 and the workpiece, when the blade 120 is too thin, the contact surface between the first cutting surface 123 and the workpiece is smaller, which affects the cutting effect, when the blade 120 is thicker, the radian of the first cutting surface 123 is smaller or larger, which results in a good chip removal effect, so the thickness of the blade 120 is 0.8-1.0mm, when the thickness of the blade 120 is 0.8mm, the best chip removal effect can be achieved, and simultaneously, the chip removal effect is also better, when the thickness of the blade 120 is 1.0mm, the best chip removal effect can be achieved, and simultaneously, the chip removal effect is also better. Of course, when the blade 120 is disposed obliquely, 0.8mm is a value at a position where the blade 120 is thin, and 1.0mm is a value at a position where the blade 120 is thick.

Optionally, each of the blades 120 further has a second cutting surface 124, and the second cutting surface 124 is disposed on a surface of the first end 121 facing the central axis of the tool holder.

The second cutting surface 124 is provided at the end of the first end 121 of the insert 120, and enables the milling cutter to be machined in the longitudinal direction. Since the second cutting surface 124 is chamfered from the first cutting surface 123, that is, the facing direction of the second cutting surface 124 is different from the facing direction of the first cutting surface 123, the rotational direction of the milling cutter is different from the rotational direction of the first cutting surface 123 when the second cutting surface 124 is cutting. Of course, the second cutting surface 124 may be provided in plural, and when provided in plural, the plural second cutting surfaces 124 are provided at intervals. When the milling cutter is vertically placed, the second cutting surface 124 can perform cutting work, a supporting surface is further arranged between the second cutting surface 124 and the first cutting surface 123, the supporting surface is abutted to the center of the cutter handle, and the second cutting surface 124 and the first cutting surface 123 are respectively connected to the supporting surface so as to enhance the cutting strength and stability of the blade 120. The second cutting face 124 is an inclined face structure, and the inclined face can provide a larger cutter relieving space during cutting, so that the cutter handle 110 is prevented from contacting with a workpiece to damage the workpiece, and the cutting face is an inclined face, so that the cutting edge is outwards protruded, and the cutting effect of the blade 120 is enhanced.

Optionally, each blade 120 is further provided with a top surface and a bottom surface which are oppositely arranged, and the bottom surface is attached to the annular mounting surface 111;

each of the inserts 120 is further provided with a first side wall surface 126 and a second side wall surface 127, the second side wall surface 127 is disposed on a surface of the second end 122 away from the first end 121, the first side wall surface 126 is disposed between the second side wall surface 127 and the second cutting surface 124 and is connected to the second side wall surface 127 and the second cutting surface 124, the first cutting surface 123, the guiding plane 125, the second cutting surface 124, the first side wall surface 126 and the second side wall surface 127 are sequentially arranged around along the circumferential direction of the insert 120 and are sequentially connected end to end, the second cutting surface 124 and the guiding plane 125 form an obtuse angle, and the first side wall surface 126 is disposed opposite to the first cutting surface 123.

The top surface is arranged at the first end 121, the second cutting surface 124 and the guide plane 125 are arranged on the top surface of the blade 120, the second side wall surface 127 is arranged on the bottom surface of the blade 120, the first cutting surface 123 and the first side wall surface 126 are arranged on the side wall of the blade 120 and are oppositely arranged, namely the first cutting surface 123, the guide plane 125, the second cutting surface 124, the first side wall surface 126 and the second side wall surface 127 are sequentially arranged in a surrounding manner along the circumferential direction of the blade 120 and are sequentially connected end to end, the first cutting surface 123 and the second cutting surface 124 can be used for cutting a workpiece, and the second cutting surface 124 is an inclined surface, so that the cutting effect can be enhanced. Since the insert 120 is protruded from the mounting surface, the remaining surfaces may be machined as cutting surfaces to cut the workpiece, if necessary.

Optionally, the tool holder is made of tungsten steel, and the blade 120 is a cutting member made of superhard material or superhard composite material.

The tool holder 110 is made of tungsten carbide (WC) materials, the blade 120 is made of superhard composite materials, the superhard materials are polycrystalline diamond (PCD), Polycrystalline Cubic Boron Nitride (PCBN), tungsten carbide and the like, or the superhard composite materials are made, the PCD and the tungsten carbide are mainly combined, the tool holder 110 and the blade 120 are connected through brazing, the tool holder becomes a tool capable of being used on a lathe or a boring machine, and the chip discharge groove 112 is formed in a processing mode on the tool holder through electric machining. The utility model discloses a handle of a knife and blade 120 are not like traditional milling cutter (be the integrated into one piece structure), the utility model discloses a handle of a knife and blade 120 are split type structure, form through the fine welding connection, so the big or small model of blade 120 can be customized as required, increases the flexibility that milling cutter cut.

The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structure changes made by the contents of the specification and the drawings under the inventive concept of the present invention, or the direct/indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims (10)

1. A milling cutter, comprising:

the end face of one end of the cutter handle is provided with an annular mounting surface, the annular mounting surface surrounds the central axis of the cutter handle and extends outwards, and the height of the annular mounting surface is gradually reduced outwards from the central axis of the cutter handle;

the blades are attached to the annular mounting surface at intervals along the surrounding direction of the annular mounting surface, each blade is provided with a first end and a second end, the first ends are close to the central axis of the cutter handle, and the second ends are connected to the first ends and extend in the direction departing from the central axis of the cutter handle;

each blade is provided with a first cutting surface, the first cutting surface extends from the first end to the second end, and the first cutting surfaces are arranged in the tangential direction facing the rotating direction of the milling cutter.

2. The milling cutter according to claim 1, wherein the annular mounting surface defines chip flutes disposed between adjacent ones of the inserts and extending outwardly from the central axis of the holder.

3. The milling cutter according to claim 2, wherein the flutes comprise first and second side walls extending in the direction of extent of the flutes, a side of the first side wall facing away from the mounting surface being connected to a side of the second side wall facing away from the mounting surface.

4. The milling cutter tool according to claim 3, wherein β, when the angle between the first side wall and the central axis of the shank is defined as β, β satisfies: beta is more than or equal to 5 degrees and less than or equal to 45 degrees.

5. The milling cutter tool according to claim 1, wherein, when the first cutting surface is defined at an angle α to the central axis of the shank, α satisfies: alpha is more than or equal to 10 degrees and less than or equal to 60 degrees.

6. The milling cutter according to claim 1, wherein the annular mounting surface has a vertical height of 0.8mm to 1.0mm from the upper surface of the insert.

7. The milling cutter tool according to claim 1, wherein each insert is further provided with a second cutting surface provided on a surface of the first end facing the central axis of the holder.

8. The milling cutter tool according to claim 7, wherein each insert further comprises a guide flat disposed on a surface of the first end facing the central axis of the holder, the guide flat being disposed between and connecting the first cutting surface and the second cutting surface.

9. The milling cutter tool according to claim 8 wherein each said insert further defines oppositely disposed top and bottom surfaces, said bottom surface abutting said annular mounting surface;

each the blade still is equipped with first lateral wall face and second lateral wall face, the second lateral wall face is located the second end deviates from the surface of first end, first lateral wall face is located the second lateral wall face with between the second cutting face, and be connected in the second lateral wall face with the second cutting face, first cutting face lead the plane the second cutting face first lateral wall face and the second lateral wall face is followed the circumference of blade encircles the setting in proper order to end connection in proper order, the second cutting face with lead the plane and be the obtuse angle setting, first lateral wall face dorsad first cutting face sets up.

10. The milling cutter according to any one of claims 1 to 9, wherein the shank is of tungsten steel and the insert is a cutting element of superhard material or a superhard composite material.

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