CN216177002U

CN216177002U - Milling cutter

Info

Publication number: CN216177002U
Application number: CN202122651831.3U
Authority: CN
Inventors: 刘占海; 樊保龙; 杜振宏; 张金波; 刘宝华; 王刚; 樊浩; 段帅新
Original assignee: Great Wall Motor Co Ltd
Current assignee: Great Wall Motor Co Ltd
Priority date: 2021-11-01
Filing date: 2021-11-01
Publication date: 2022-04-05
Anticipated expiration: 2031-11-01

Abstract

The utility model provides a milling cutter, which comprises a cutter handle and a cutter body fixedly connected with the cutter handle; the cutter body is provided with at least one group of blades at the end part, each group of blades is provided with a plurality of blades arranged along the circumferential direction of the cutter body, and the cutting tracks of two adjacent blades in each blade are partially overlapped. According to the milling cutter, each group of blades is provided with the plurality of blades which are arranged in a step shape along the circumferential direction of the cutter body, cutting tracks between every two adjacent blades are partially overlapped, one-step machining forming of an ultra-long cutting piece can be achieved, and compared with the existing long-blade structure, cutting resistance and machining difficulty can be reduced.

Description

Milling cutter

Technical Field

The utility model relates to the technical field of cutters, in particular to a milling cutter.

Background

PCD (Polycrystalline Diamond) milling cutters have the characteristics of high hardness, high compressive strength, good thermal conductivity and wear resistance and the like, and can obtain very high machining precision and machining efficiency in high-speed cutting, thus having wide application. At present, a long-edge PCD (Poly Crystal Diamond) blade structure is generally adopted for processing an overlong cutting workpiece on a numerical control milling machine, the welding difficulty of the tool is high, the cutting resistance of the tool in processing is large, the PCD blade is easy to collapse and has short service life, and the batch application of the numerical control machine cannot be met.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention is directed to a milling cutter to implement one-step forming of an ultra-long cutting workpiece.

In order to achieve the purpose, the technical scheme of the utility model is realized as follows:

the end of the cutter body is provided with at least one group of blades, each group of blades is provided with a plurality of blades which are circumferentially arranged along the cutter body, and in each group of blades, the cutting tracks of two adjacent blades are partially overlapped.

Furthermore, in the plurality of blades in each group, an included angle is formed between two adjacent blades, and in all the included angles formed, the included angles have different angles.

Further, in each group of a plurality of the blades, the included angle is between 40 and 50 degrees.

Furthermore, two ends of each blade in the extension direction are respectively provided with a blade tip, the blade tip at least one end is arc-shaped, and the arc radius of the arc-shaped blade tip is between 0.1 and 0.4 mm.

Further, the extension line of each blade intersects with the axis of the cutter body.

Furthermore, the end of the cutter body, where the blades are arranged, is provided with a conical surface, the blades extend along a generatrix of the conical surface and at least partially protrude out of the conical surface, and a shearing angle of 5-10 degrees is formed between each blade and the axis of the cutter body.

Furthermore, the same side of each blade is provided with a chip groove positioned on the cutter body.

Furthermore, a cooling liquid flow channel which penetrates through the cutter handle and extends into the cutter body is arranged in the milling cutter, a cooling liquid outlet communicated with the cooling liquid flow channel is arranged in each chip groove, and the cooling liquid outlet is close to the blade.

Furthermore, a dynamic balance adjusting structure is arranged on the peripheral wall of the cutter handle.

Further, each blade adopts a PCD blade, and/or the tool holder adopts an HSK tool holder.

Compared with the prior art, the utility model has the following advantages:

according to the milling cutter, each group of blades is provided with the plurality of blades arranged along the circumferential direction of the cutter body, the cutting tracks between every two adjacent blades are partially overlapped, one-time processing and forming of an ultra-long cutting piece can be achieved, and compared with the existing long-blade structure, cutting resistance and processing difficulty can be reduced, so that the milling cutter has a good using effect.

In addition, in the utility model, the included angles formed between two adjacent blades in the plurality of blades in each group are different, so that the resonance of the cutter can be effectively prevented, and the surface smoothness of the processed workpiece can be improved. The tool nose at least one end is designed into an arc shape, the radius of the arc is set between 0.1mm and 0.4mm, the cutting force at the position of the tool nose can be effectively dispersed, thereby avoiding cutting vibration and breakage, and simultaneously effectively preventing the machined workpiece from cutting scratches. The cutting edge sharpness can be improved and the cutting resistance can be reduced by arranging the shearing angle of 5-10 degrees between each blade and the axis of the cutter body, so that the cutting deformation of a machined workpiece can be avoided.

In addition, the same side of each blade is respectively provided with the chip removal grooves on the cutter body, so that accumulated chips in the machining process can be conveniently and timely discharged. Through set up the coolant liquid passageway in milling cutter, usable coolant liquid is cooled down milling cutter to can prevent that milling cutter high temperature and reduce the processingquality to the work piece, also can prolong milling cutter's life simultaneously. The dynamic balance adjusting structure is arranged on the peripheral wall of the cutter handle, so that the cutting speed of the cutter can be improved, and the surface smoothness of a workpiece can be improved. And each blade adopts PCD blade, can make milling cutter have better machining precision and machining efficiency.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:

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

fig. 2 is a schematic structural view of a milling cutter according to an embodiment of the present invention with one of the fourth cutting inserts removed;

fig. 3 is a schematic structural view of a milling cutter according to an embodiment of the present invention from another perspective;

FIG. 4 is a left side view of FIG. 3;

FIG. 5 is a schematic view of a first blade according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a fourth blade according to an embodiment of the present invention.

Description of reference numerals:

1. a cutter body; 101. a first blade; 102. a second blade; 103. a third blade; 104. a fourth blade; 105. mounting grooves; 106. a chip groove; 107. a coolant outlet;

2. a knife handle; 201. an adjustment groove;

m, a main cutting edge; n, minor cutting edge.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it should be noted that, if terms indicating orientation or positional relationship such as "upper", "lower", "inside", "outside", etc. appear, they are based on the orientation or positional relationship shown in the drawings and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the appearances of the terms first, second, etc. in this specification are not necessarily all referring to the same item, but are instead intended to cover the same item.

In addition, in the description of the present invention, the terms "mounted," "connected," and "connecting" are to be construed broadly unless otherwise specifically limited. For example, the connection can be fixed, detachable or integrated; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. To those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in conjunction with specific situations.

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

This embodiment relates to a milling cutter, and in the global design, it includes handle of a knife 2 to and the cutter body 1 that links firmly with handle of a knife 2. Wherein, the end of the cutter body 1 is provided with at least one group of blades, each group of blades has a plurality of blades arranged along the circumference of the cutter body 1, and in each blade, the cutting tracks of two adjacent blades are partially overlapped.

The milling cutter of the embodiment can realize one-step processing forming of an ultra-long cutting piece by enabling each group of blades to be provided with a plurality of blades arranged along the circumferential direction of the cutter body 1 and enabling cutting tracks of two adjacent blades to be partially overlapped, and can reduce cutting resistance and processing difficulty compared with the existing long-blade structure.

Based on the above general description, an exemplary structure of the milling cutter of the present embodiment is shown in fig. 1 to 4, in which the end of the cutter body 1 is provided with three sets of blades, and each set of blades has the same structure and includes four blades arranged at intervals around the axial direction of the cutter body 1. Of course, instead of three sets of blades, two sets, one set, or four sets, five sets, etc. of blades may be provided. In addition, each group of blades may include three, five, etc. blades arranged at intervals, in addition to four blades arranged at intervals.

In this embodiment, as a preferred implementation manner, each of the blades is a PCD blade, which can utilize the characteristics of high wear resistance and good heat dissipation of the PCD material to ensure the dimensional accuracy of the cutter and the stability of the processing accuracy, so that the milling cutter of this embodiment has better processing accuracy and processing efficiency. Of course, other blades than PCD blades may be used.

Furthermore, the tool holder 2 of the present embodiment is also preferably an HSK tool holder. Moreover, for better use effect, the present embodiment further provides a dynamic balance adjusting structure on the outer peripheral wall of the handle 2, and as shown in fig. 3, the dynamic balance adjusting structure is obtained by removing material from the handle 2, and specifically is an adjusting groove 201 provided on the handle 2.

As shown in fig. 4 in combination with fig. 1, in order to improve the machining effect on the workpiece, the three groups of inserts on the cutter body 1 of the present embodiment are sequentially distributed along the circumferential direction of the cutter body 1. In order to arrange each insert on the cutter body 1, as an exemplary embodiment, as shown in fig. 2, an installation groove 105 adapted to each insert is formed on the cutter body 1, and each insert is fixed to the cutter body 1 by brazing after being fitted into the corresponding installation groove 105.

Still referring to fig. 1 and 2, in order to discharge accumulated chips in time, chip discharge grooves 106 are also formed on the same side of each blade, the mounting grooves 105 for mounting the blades are located at one ends of the chip discharge grooves 106 and are communicated with the chip discharge grooves 106, and the other ends of the chip discharge grooves 106 extend to the edge of the cutter body 1. In this embodiment, each insert is fitted with 1 flute 106 to facilitate reducing the effect on the amount of unbalance of the milling cutter. It should be noted that, in specific implementation, the depth of each flute 106 and the depth of the adjusting groove 201 are adjusted in a matching manner, so that the center of gravity of the milling cutter as a whole is distributed on the axis of the milling cutter, and the milling cutter has good dynamic balance performance to meet high use requirements.

In the present embodiment, the milling cutter is provided with a coolant flow path extending through the shank 2 and into the cutter body 1, and as shown in fig. 1 and 2, a coolant outlet 107 communicating with the coolant flow path is provided in each chip groove 106. At this time, in order to enhance the cooling effect on each blade, each cooling liquid outlet 107 is provided near each mounting groove 105, that is, near the blade. However, the coolant outlets 107 are not limited to the positions shown in fig. 1, and the positions of the respective coolant outlets 107 can also be adjusted according to design requirements. In addition, the coolant outlet 107 in each flute 106 may be one as shown in fig. 1, or a plurality of coolant outlets 107 may be provided at intervals, and each coolant outlet 107 may communicate with the coolant flow channel.

In addition, as shown in fig. 3, each blade in the present embodiment has a shearing angle α with the axis of the cutter body 1, and the shearing angle α is specifically 5 ° to 10 °. By setting the shearing angle alpha, the cutting resistance of the cutting edge of each blade can be effectively reduced, and the temperature of a cutting area is reduced, so that the plastic deformation of a machined workpiece caused by large cutting resistance can be prevented, and the service life of the milling cutter can be better prolonged. In this embodiment, as a preferred embodiment, the shear angle α may be 10 °. However, instead of setting the cutting angle of each blade to 10 °, it is needless to say that it may be set to 9 °, 8 °, 7 °, 6 °, 5 °, or another value within the above range.

In the present embodiment, a detailed description will be given of each group of blades by taking one of the blades as an example, and in this case, as shown in fig. 4, each group of blades includes a first blade 101, a second blade 102, a third blade 103 and a fourth blade 104 which are sequentially arranged around the direction of the axis of the cutter body 1. In a preferred embodiment, the first blade 101, the second blade 102, and the third blade 103 have the same structure, and the fourth blade 104 has a different structure.

In the first embodiment, the first blade 101 is illustrated as an example, and as shown in fig. 5, the first blade 101 is substantially shaped like a semicircle, the length of the cutting edge thereon may be 10mm, for example, and the first blade 101 has only the main cutting edge m thereon. While the fourth insert 104 has a structure as shown in fig. 6, unlike the other three inserts, the fourth insert 104 has both a main cutting edge m and a side sub-cutting edge n, the sub-cutting edge n slightly protrudes outward from the cutter body 1 in the radial direction of the cutter body 1, and the length of the main cutting edge m may be 10mm, for example.

Further, as shown in fig. 5, cutting edges are formed at both ends of the first blade 101 in the extending direction, and the cutting edges at both ends have a circular arc shape having a radius of 0.1 to 0.4 mm. As shown in fig. 6, cutting edges are formed at both ends of the top portion of the fourth blade 104, and the cutting edges at both ends are also formed in an arc shape having a radius of 0.1 to 0.4 mm. Further, the arc radius of the cutting edge of each insert is the same for the convenience of manufacturing, and as a specific embodiment, the arc radius of the cutting edge of each insert is 0.3mm in the present embodiment.

The tool nose of each blade is designed to be arc-shaped, so that the cutting force at the tool nose position can be effectively dispersed, cutting vibration and breakage can be avoided, cutting scratches on a machined workpiece can be effectively prevented, and the surface smoothness of the workpiece can be improved. In addition, the cutting edges at both ends of each blade may be formed in an arc shape, or only the cutting edge at one end may be formed in an arc shape. The arc radius of the cutting edge is not limited to 0.3mm, and can be adjusted according to design requirements, for example, 0.1mm, 0.2mm, 0.4mm, or other values.

Furthermore, as a preferred embodiment, the extension lines of the blades in the present embodiment intersect with the axis of the cutter body 1, so as to facilitate the arrangement of the blades at the end of the cutter body 1. However, it is also possible to provide, in addition to intersecting the axis of the cutter body 1, the cutting paths of the adjacent two inserts in each set of inserts so that the extension lines of the inserts do not intersect the axis of the cutter body 1, which is naturally practical.

Also as a preferred embodiment, as shown in fig. 1 to 3 in this embodiment, the end of the cutter body 1 provided with each blade may be designed to be tapered, and the end of the cutter body 1 provided with a tapered surface. At this time, the mounting grooves 105 for the insert mounting and the chip grooves 106 are formed on the tapered surface to mount the inserts on the tapered surface of the end of the cutter body 1. Meanwhile, each blade of the present embodiment extends along a generatrix of the conical surface, and each blade also at least partially protrudes from the conical surface, and the main cutting edge m is located at an end of the protruding portion of the blade.

The end part of the cutter body 1 provided with the blades is set to be conical, so that the milling cutter of the embodiment can be favorably set to be in a working state, and the blades can be conveniently arranged at the end part of the cutter body 1. However, the end of the cutter body 1 provided with the insert may not be tapered, as a matter of course, instead of providing the end of the cutter body 1 with a tapered surface and arranging the insert on the tapered surface. For example, the end of the cutter body 1 where the insert is provided may be provided in a planar shape, and each cutter body is also provided on the planar surface of the end of the cutter body via the mounting groove 105, and the chip groove 106 is also provided corresponding to each cutter body.

In this embodiment, based on that the extension lines of the blades intersect with the axis of the cutter body 1, or based on that the blades are arranged on the conical surface of the end of the cutter body 1 and extend along the generatrix of the conical surface, included angles are formed between two adjacent blades in four blades of each group, and in all the included angles formed, the included angles are different from each other. The included angles of each group of blades are set to be different from each other, so that the milling cutter can be prevented from resonating to reduce the surface finish of a workpiece.

At this time, in particular, the included angle formed between the adjacent two inserts in each set of four inserts may be set to be between 40 ° and 50 °, and the cutting resistance can be reduced well in this angle range. As a specific embodiment, as shown in fig. 4, the angle between the first blade 101 and the second blade 102 may be, for example, 55 °, the angle between the second blade 102 and the third blade 103 may be, for example, 45 °, and the angle between the third blade 103 and the fourth blade 104 may be, for example, 50 °.

Through the arrangement of the angle and based on the length of the main cutting edge m on each blade, when the cutting tool is used, each group of four blades integrally form a 35mm long cutting edge, so that one-step processing and forming of the super-long cutting piece can be realized.

In this embodiment, it should be noted that, in addition to the same structure as the first blade 101, the second blade 102 and the third blade 103 may also have a structure different from that of the first blade 101, and the blade lengths of the two blades may also be designed to be different from that of the first blade 101. The fourth blade 104 may also adopt the same structure as the other three blades, and the tip of one end of the fourth blade 104 slightly protrudes out of the cutter body 1. During specific implementation, the length of the cutting edge of each blade can be correspondingly adjusted according to specific conditions, so that the four blades are spliced into long cutting edges with different lengths.

By adopting the structure, the milling cutter of the embodiment can reduce the processing difficulty and cost, prolong the service life, realize the one-step forming processing of an ultra-long cutting workpiece, reduce the cutting resistance and improve the surface finish of the workpiece, and has good practicability.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A milling cutter characterized by: the cutter comprises a cutter handle (2) and a cutter body (1) fixedly connected with the cutter handle (2), wherein at least one group of blades is arranged at the end part of the cutter body (1), each group of blades is provided with a plurality of blades which are circumferentially arranged along the cutter body (1), and in each group of blades, the cutting tracks of the two adjacent blades are partially overlapped.

2. The milling cutter according to claim 1, wherein:

in the plurality of blades in each group, an included angle is formed between every two adjacent blades, and in all the included angles formed, the included angles are different from each other.

3. The milling cutter according to claim 2, wherein:

in each group of a plurality of the blades, the included angle is between 40 and 50 degrees.

4. The milling cutter according to claim 1, wherein:

the two ends of each blade in the extending direction are respectively provided with a cutter point, the cutter point at least one end is in an arc shape, and the arc radius of the cutter point in the arc shape is between 0.1 and 0.4 mm.

5. The milling cutter according to claim 1, wherein:

the extension line of each blade is intersected with the axis of the cutter body (1).

6. The milling cutter according to claim 1, wherein:

the end, provided with the blades, of the cutter body (1) is provided with a conical surface, the blades extend along a generatrix of the conical surface and at least partially protrude out of the conical surface, and a shearing angle of 5-10 degrees is formed between each blade and the axis of the cutter body (1).

7. The milling cutter according to claim 1, wherein:

the same side of each blade is provided with a chip groove (106) positioned on the cutter body (1).

8. The milling cutter according to claim 7, wherein:

the milling cutter is characterized in that a cooling liquid flow channel which penetrates through the cutter handle (2) and extends into the cutter body (1) is arranged in the milling cutter, a cooling liquid outlet (107) communicated with the cooling liquid flow channel is arranged in each chip groove (106), and the cooling liquid outlet (107) is close to the blade.

9. The milling cutter according to claim 7, wherein:

and a dynamic balance adjusting structure is arranged on the peripheral wall of the knife handle (2).

10. The milling cutter according to any one of claims 1 to 9, wherein:

each blade adopts a PCD blade, and/or the tool holder (2) adopts an HSK tool holder.