Inner-cooling milling cutter

Abstract

The invention provides an inner-cooling milling cutter which comprises a cutter handle, a cutting section, an inner-cooling hole and a side edge water outlet hole, the cutting section is connected with the cutter handle, the inner-cooling hole extends from one end, away from the cutting section, of the cutter handle to the interior of the cutter handle and extends into the cutting section, and the side edge water outlet hole is connected with the inner-cooling hole. The cutting section is provided with an axial end far away from the cutter handle, the end, located in the cutting section, of the inner cooling hole is not communicated with the axial end of the cutting section, the side blade water outlet hole is formed in the cutting section, one end of the side blade water outlet hole is communicated with the inner cooling hole, and the other end of the side blade water outlet hole is communicated with the cutter handle. And water can be discharged from the other end of the side blade water outlet hole in the direction of the cutter handle. According to the invention, the cooling liquid can be reversely discharged, so that the cutting edge part of the whole cutter participating in cutting can be fully cooled, the service life of the milling cutter is prolonged, and the production cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of machine tools, in particular to an internally cooled milling cutter. Background Art

[0002] Aluminum profiles have the advantages of light weight, good strength, good ductility, and excellent corrosion resistance, and are used in new energy vehicles, mobile phones, aerospace and other fields. Aluminum profiles are softer than conventional steel and can be machined with large cutting depth and high feed parameters. The processing efficiency is much higher than that of steel. However, due to the low melting point of aluminum, aluminum chips are easy to melt during efficient processing and stick to the tool, reducing the service life of the tool. Therefore, aluminum tools require sharper edge structures and more adequate cooling methods.

[0003] Among them, most of the CNC machine tools produced by intelligent equipment companies are developed for the new energy vehicle industry and are mainly used for processing aluminum. They require the development of efficient aluminum processing tools to give full play to the processing performance of the machine tools.

[0004] The existing patent "CN113319348B An internally cooled tool" discloses an end through hole with water outlet on the side, an axial liquid inlet channel is provided at the central axis of the rod-shaped body, and n bottom liquid outlet channels and n circumferential liquid outlet channels are provided in the cutting part, which are the same number as the number of chip removal grooves, and the bottom liquid outlet channels and the circumferential liquid outlet channels are respectively connected to the axial liquid inlet channel. The end through hole of this patent will lose part of the flow of the side water outlet hole, and the cooling effect on the overall cutting edge is average.

[0005] The patent "CN220480346U An internally cooled bar and tool" discloses an internally cooled bar and tool. The tool has two layers of cooling: the tool internal cooling hole and the multi-layer pore structure internal cooling, which solves the problem that the existing internally cooled tools and the bar materials used to make internally cooled tools are difficult to meet the requirements of fast, accurate, comprehensive and sufficient cooling of the cutting edge under the conditions of large feed and deep side milling. The patent has a complex structure and high manufacturing cost, and it is difficult to apply it in large quantities in actual products.

[0006] The above conventional integral milling cutter mainly uses the bottom blade and side blade for milling processing. The internal cooling outlet of the internal cooling milling cutter is mainly concentrated on the bottom blade and side blade, and the coolant is discharged downward, which can meet the normal processing cooling requirements of the milling cutter. With the development of new energy vehicles, the demand for aluminum profile processing is increasing. Different from conventional steel processing, aluminum profiles have characteristics that require fast feed and full cut. This results in the conventional internal cooling tool coolant being unable to truly cool down.

[0007] Since the internally-cooled milling cutter in the prior art has technical problems such as insufficient cooling area and cooling performance to be improved, the present invention studies and designs an internally-cooled milling cutter. Summary of the invention

[0008] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the internally cooled milling cutter in the prior art, that is, the cooling area is insufficient and the cooling performance needs to be improved, thereby providing an internally cooled milling cutter.

[0009] In order to solve the above problems, the present invention provides an internally cooled milling cutter, comprising:

[0010] A tool handle, a cutting segment, an inner cooling hole and a side edge water outlet hole, wherein the cutting segment is connected to the tool handle, the inner cooling hole extends from one end of the tool handle away from the cutting segment toward the inside of the tool handle and extends to the inside of the cutting segment, the cutting segment has an axial end away from the tool handle, one end of the inner cooling hole located inside the cutting segment is not connected to the axial end of the cutting segment, and the side edge water outlet hole is arranged on the cutting segment, one end of the side edge water outlet hole is connected to the inner cooling hole, and the other end of the side edge water outlet hole can discharge water in the direction of the tool handle.

[0011] In some embodiments,

[0012] The end of the side edge water outlet hole connected to the inner cooling hole is the first end, the water outlet end of the side edge water outlet hole is the second end, and from the first end to the second end, the side edge water outlet hole extends in the direction close to the shank.

[0013] In some embodiments,

[0014] The shank and the cutting section have the same central axis, which is the first central axis, and in the longitudinal cross-sectional plane passing through the first central axis, the side blade water outlet has a second central axis, and the first central axis intersects with the second central axis or intersects with the extension line of the second central axis, and the first central axis is a connecting line segment from the axial end of the shank to the intersection position with the second central axis or the intersection position with the extension line of the second central axis, and an acute angle is provided between the connecting line segment and the second central axis of the side blade water outlet.

[0015] In some embodiments,

[0016] The acute angle has an angle range of 45° to 90°, the inner cooling hole is located at the position of the first central axis and the extension direction of the inner cooling hole is along the direction of the first central axis.

[0017] In some embodiments,

[0018] The cutting segment includes a cutting edge and a chip groove, the chip groove is between two adjacent cutting edges, the side edge water outlet hole is arranged in the chip groove, the side edge water outlet hole is located inside the cutting segment, one end of the side edge water outlet hole is connected to the inner cooling hole, and the other end extends to the outer surface of the chip groove.

[0019] In some embodiments,

[0020] The chip removal groove has a groove bottom, which is the position closest to the inner cooling hole, and the other end of the side edge water outlet hole extends to the outer surface of the groove bottom of the chip removal groove.

[0021] In some embodiments,

[0022] There are at least two chip removal grooves in the circumferential direction of the cutting segment, and there are at least two side edge water outlet holes, and the side edge water outlet holes are arranged in a one-to-one correspondence with the chip removal grooves.

[0023] In some embodiments,

[0024] In the projection plane of the axial end face of the cutting segment, there is an angle C between the central axes of two adjacent side cutting edge water outlet holes in the circumferential direction, and the value range of C is 60° to 90°.

[0025] In some embodiments,

[0026] The cutting segment is also provided with an end cutting edge at the axial end away from the tool handle, the inner cooling hole is not connected to the end cutting edge, and a minimum distance greater than 0 is provided between one end of the inner cooling hole located inside the cutting segment and the end cutting edge.

[0027] In some embodiments,

[0028] The minimum distance between one end of the inner cooling hole located inside the cutting segment and the end cutting edge is 3 to 5 mm.

[0029] In some embodiments,

[0030] The aperture of the water outlet hole of the side blade is b, the diameter of the handle is d, and the two satisfy the relationship: b=0.08d~0.1d.

[0031] In some embodiments,

[0032] There are at least two side edge water outlet holes, and at least two side edge water outlet holes are arranged at intervals along the direction of the central axis of the cutting segment; and / or,

[0033] There are at least two side blade water outlet holes, and the central axes of at least two side blade water outlet holes are located on the same straight line and are parallel to the central axis of the handle.

[0034] In some embodiments,

[0035] There are at least two side edge water outlet holes, and the central axes of at least two of the side edge water outlet holes are parallel to the axial end face of the cutting segment, and the central axes of at least two of the side edge water outlet holes are located in the same plane, so that the central axes of at least two of the side edge water outlet holes have the same distance from the axial end face of the cutting segment.

[0036] In some embodiments,

[0037] The central axes of the plurality of side blade water outlet holes are all perpendicular to the central axis of the knife handle.

[0038] The internal cooling milling cutter provided by the present invention has the following beneficial effects:

[0039] The present invention sets an inner cooling hole inside the inner cooling milling cutter, and one end of the inner cooling hole located inside the cutting section is not connected with the axial end of the cutting section, thereby ensuring that the cooling water in the inner cooling hole will not be discharged from the axial end of the cutting section (that is, the inner cooling hole adopts a method of not having a through hole at the end to ensure the flow rate and water discharge effect of the coolant from the side edge water outlet hole), and at the same time, a side edge water outlet hole is set on the cutting section, and the side edge water outlet hole is connected with the inner cooling hole to receive cooling water, and the other end of the side edge water outlet hole discharges water in the direction of the tool handle, which can form a reverse water discharge effect, that is, the coolant is discharged in the reverse direction through the side edge reverse cooling hole, so that the cutting edge part of the entire tool involved in cutting can be fully cooled, thereby increasing the service life of the milling cutter and reducing the production cost; at the same time, due to sufficient cooling, the processing efficiency of the milling cutter can be improved. Through experimental testing, the reverse water outlet structure can achieve comprehensive cooling of the tool during the processing of drilling and reaming of aluminum profiles, and the service life of the tool is increased by 50%. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a front structural diagram of an internally cooled milling cutter according to Embodiment 1 of the present invention;

[0041] Figure 2 yes Figure 1 A diagram of the direction A;

[0042] Figure 3 is a front structural diagram of an internally cooled milling cutter according to Embodiment 2 of the present invention;

[0043] Figure 4 It is a front structural diagram of the internal cooling milling cutter of embodiment 3 of the present invention.

[0044] The reference numerals are:

[0045] 1. Tool handle; 2. Cutting edge; 3. Internal coolant hole; 4. Side edge water outlet hole; 5. End cutting edge; 6. Chip groove; 7. Cutting section. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0048] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0049] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0050] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0051] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0052] like Figure 1-4 As shown, the present invention provides an internal cooling milling cutter, which comprises:

[0053] A tool handle 1, a cutting segment 7, an inner cooling hole 3 and a side edge water outlet hole 4, wherein the cutting segment 7 is connected to the tool handle 1, the inner cooling hole 3 extends from one end of the tool handle 1 away from the cutting segment 7 toward the inside of the tool handle 1 and extends to the inside of the cutting segment 7, the cutting segment 7 has an axial end away from the tool handle 1, one end of the inner cooling hole 3 located inside the cutting segment 7 is not connected to the axial end of the cutting segment 7, and the side edge water outlet hole 4 is arranged on the cutting segment 7, one end of the side edge water outlet hole 4 is connected to the inner cooling hole 3, and the other end of the side edge water outlet hole 4 can discharge water in the direction of the tool handle 1.

[0054] The present invention sets an inner cooling hole inside the inner cooling milling cutter, and one end of the inner cooling hole located inside the cutting section is not connected with the axial end of the cutting section, thereby ensuring that the cooling water in the inner cooling hole will not be discharged from the axial end of the cutting section (that is, the inner cooling hole adopts a method of not having a through hole at the end to ensure the flow rate and water discharge effect of the coolant from the side edge water outlet hole), and at the same time, a side edge water outlet hole is set on the cutting section, and the side edge water outlet hole is connected with the inner cooling hole to receive cooling water, and the other end of the side edge water outlet hole discharges water in the direction of the tool handle, which can form a reverse water discharge effect, that is, the coolant is discharged in the reverse direction through the side edge reverse cooling hole, so that the cutting edge part of the entire tool involved in cutting can be fully cooled, thereby increasing the service life of the milling cutter and reducing the production cost; at the same time, due to sufficient cooling, the processing efficiency of the milling cutter can be improved. Through experimental testing, the reverse water outlet structure can achieve comprehensive cooling of the tool during the processing of drilling and reaming of aluminum profiles, and the service life of the tool is increased by 50%.

[0055] In some embodiments,

[0056] The end of the side edge water outlet hole 4 connected to the inner cooling hole 3 is the first end, the water outlet end of the side edge water outlet hole 4 is the second end, and from the first end to the second end, the side edge water outlet hole 4 extends in the direction close to the shank 1.

[0057] This is the preferred structural form of the side edge water outlet hole of the present invention, that is, the extension direction from the first end connected to the inner cooling hole to the second end of the outer surface is towards the direction close to the tool handle, thereby preferably forming a reverse water outlet mode of the side edge, so that the entire cutting edge part can be fully cooled, the cooling area is increased, and the cooling performance of the internal cooling milling cutter blade is improved.

[0058] In some embodiments,

[0059] The shank 1 and the cutting segment 7 have the same central axis, which is the first central axis, and in the longitudinal cross-sectional plane passing through the first central axis, the side blade water outlet 4 has a second central axis, and the first central axis intersects with the second central axis or intersects with the extension line of the second central axis, and the first central axis is a connecting line segment from the axial end of the shank 1 to the intersection position with the second central axis or the intersection position with the extension line of the second central axis, and an acute angle is provided between the connecting line segment and the second central axis of the side blade water outlet 4.

[0060] The present invention further preferably arranges the side blade water outlet hole in a manner such that an acute angle is provided between the central axis thereof and the central axis of the shank, thereby effectively limiting the extension direction of the side blade water outlet hole, i.e., extending obliquely toward the direction of the shank, thereby being able to effectively cool the cutting edge close to the shank, thereby improving the cooling performance of the cutting edge.

[0061] In view of the problem that in the full-cutting condition of aluminum profile processing, the tool is not cooled properly, resulting in accelerated tool wear and short tool life (conventional internally cooled milling cutters can only cool the end cutting edge but cannot cool the entire cutting edge), the present invention provides an efficient aluminum processing internally cooled milling cutter with cooling holes on the end cutting edge but no through holes and reverse water outlets on the side cutting edge, so as to achieve sufficient cooling of the tool during the processing, increase the tool life and reduce production costs.

[0062] The invention provides a high-efficiency aluminum processing internal cooling milling cutter with a cooling hole end edge without through holes and a side edge water outlet hole with reverse water outlet. The cutter is fully cooled during the aluminum profile drilling and reaming process, thereby increasing the tool life and reducing production costs. Through experimental processing comparison tests, the tool life is increased by 50% and the wear of the side edge is reduced.

[0063] In some embodiments,

[0064] The acute angle has an angle range of 45° to 90°, the inner cooling hole 3 is located at the position of the first central axis, and the extension direction of the inner cooling hole 3 is along the direction of the first central axis.

[0065] The water outlet direction of the side water outlet (side edge water outlet) of the present invention extends toward the direction of the shank, thereby forming a direction opposite to the milling cutter cutting edge and forming a certain angle a with the central axis of the shank, and the value range of a is 45° to 90° (the angle between the side edge water outlet and the central axis of the shank of the present invention is further preferably 45°), which can ensure that the coolant is better sprayed to the side when the bottom is blocked and refluxes, providing sufficient cooling effect for the entire cutting edge; if the angle is greater than 90°, the direction of the water outlet is consistent with the direction of the milling cutter cutting edge, and the coolant can only cool the part of the cutting edge below the water outlet, and the overall cooling effect is not as good as the reverse water outlet structure; if the angle is less than 45°, the difficulty of water outlet will increase, and a higher cooling hydraulic pressure will be required.

[0066] In some embodiments,

[0067] The cutting segment 7 includes a cutting edge 2 and a chip groove 6, the chip groove 6 is between two adjacent cutting edges 2, the side edge water outlet hole 4 is arranged in the chip groove 6, the side edge water outlet hole 4 is located inside the cutting segment 7, one end of the side edge water outlet hole 4 is connected to the inner cooling hole 3, and the other end extends to the outer surface of the chip groove 6.

[0068] The present invention preferably arranges the side edge water outlet hole in the chip groove, so that the side edge water outlet hole can discharge water in the reverse direction to cool the cutting edge while cleaning the debris in the chip groove, ensuring that the milling process is continuously and effectively carried out.

[0069] In some embodiments,

[0070] The chip removal groove 6 has a groove bottom, which is the position closest to the inner cooling hole 3 , and the other end of the side edge water outlet hole 4 extends to the outer surface of the groove bottom of the chip removal groove 6 .

[0071] This is a further preferred structural form of the side edge water outlet of the present invention, that is, it extends to the outer surface of the bottom of the chip removal groove, so that the debris at the bottom of the groove can be effectively cleaned and cleared, thereby improving the cleaning effect.

[0072] In some embodiments,

[0073] There are at least two chip removal grooves 6 in the circumferential direction of the cutting segment 7 , and there are at least two side edge water outlet holes 4 , and the side edge water outlet holes 4 are arranged in a one-to-one correspondence with the chip removal grooves 6 .

[0074] The present invention arranges the side edge water outlet holes and the chip grooves in one-to-one correspondence, so that each chip groove can be effectively cleaned by water spraying, thereby improving the cleaning effect of each chip groove and the cooling effect of each cutting edge, thereby improving the working performance of the milling cutter.

[0075] In some embodiments,

[0076] In the projection plane of the axial end face of the cutting segment 7, there is an angle C between the central axes of two adjacent side cutting edge water outlet holes 4 in the circumferential direction, and the value range of C is 60° to 90°.

[0077] The present invention preferably has side edge water holes spirally distributed in the circumferential direction at each chip groove 6 of the milling cutter, and the value range of the angle C between two adjacent side edge water holes in the circumferential direction is 60° to 90°. On the one hand, it is to ensure that the side water holes can be evenly distributed on the inner side of each chip groove 6 to avoid the angle being too small or too large, so that the side water holes are distributed close to the cutting edge, thereby reducing the edge strength of the tool. The circumferential angle of each side water outlet of the present invention is further preferably 90°.

[0078] In some embodiments,

[0079] The cutting segment 7 is also provided with an end cutting edge 5 at the axial end away from the shank 1, the inner cooling hole 3 is not connected to the end cutting edge 5, and a minimum distance greater than 0 is provided between one end of the inner cooling hole 3 located inside the cutting segment 7 and the end cutting edge 5.

[0080] The present invention preferably does not connect one end of the inner cooling hole with the end cutting edge to prevent cooling water from being discharged from the end cutting edge. At the same time, it can ensure the strength of the tool and avoid the gap between the inner cooling hole and the end cutting edge being too thin, which may cause damage and affect the cooling effect. The pressure of the cooling water is very high during the processing, and the tool cutting will generate a lot of heat. Under the combination of the two, if the gap between the inner cooling hole and the end cutting edge is too thin, it will break, affecting the flow of the coolant in the side water outlet and reducing the cooling effect of the tool.

[0081] In some embodiments,

[0082] The minimum distance between one end of the inner cooling hole 3 located inside the cutting segment 7 and the end cutting edge 5 is 3 to 5 mm.

[0083] The present invention preferably sets the minimum distance between the end of the inner cooling hole and the end cutting edge to be 3 to 5 mm, which can further prevent the cooling water from being discharged from the end cutting edge. At the same time, it can ensure the strength of the tool and avoid the inner cooling hole and the end cutting edge being too thin, causing damage and affecting the cooling effect.

[0084] In some embodiments,

[0085] The diameter of the side blade water outlet hole 4 is b, the diameter of the shank 1 is d, and the two satisfy the relationship: b=0.08d~0.1d.

[0086] The diameter b of the side edge water outlet hole of the present invention is related to the diameter d of the milling cutter. The value formula of b is b=0.08d~0.1d. The main reason is that when the diameter of the side edge water outlet hole is less than 0.08d, the hole diameter will be too small, and the coolant flow rate will be too small to fully cool the milling cutter. When the diameter of the side edge water outlet hole is greater than 0.1d, the hole diameter will be too large, which will reduce the overall strength of the milling cutter and easily cause the cutter to break during fast feeding and full cutting.

[0087] In some embodiments,

[0088] like Figure 1 , there are at least two side edge water outlet holes 4, and at least two side edge water outlet holes 4 are arranged at intervals along the direction of the central axis of the cutting segment 7; and / or,

[0089] like Figure 3 There are at least two side edge water outlet holes 4 , and the central axes of at least two side edge water outlet holes 4 are located on the same straight line and are parallel to the central axis of the handle 1 .

[0090] These are two different structural forms of the side blade water outlet holes of the present invention. The first is that a plurality of the side blade water outlet holes are arranged at intervals along the direction of the central axis, and the second is that the central axes of the side blade water outlet holes are all located on the same straight line and parallel to the central axis of the handle.

[0091] The invention provides a high-efficiency aluminum processing internal cooling milling cutter with a cooling hole end edge without through holes and a side edge water outlet hole with reverse water outlet. The cutter is fully cooled during the aluminum profile drilling and reaming process, thereby increasing the tool life and reducing production costs. Through experimental processing comparison tests, the tool life is increased by 50% and the wear of the side edge is reduced.

[0092] In some embodiments,

[0093] There are at least two side edge water holes 4, and the central axes of at least two of the side edge water holes 4 are parallel to the axial end face of the cutting segment 7, and the central axes of at least two of the side edge water holes 4 are located in the same plane, so that the central axes of at least two of the side edge water holes 4 have the same distance from the axial end face of the cutting segment 7.

[0094] This is the preferred structural form of the side edge water outlet holes of Example 3 of the present invention, that is, multiple side edge water outlet holes are located in the same plane, that is, in a plane that is the same distance from the axial end face of the cutting section, so that the central axis of the water outlet holes can be perpendicular to the central axis of the milling cutter, which can effectively improve the strength of the cutting section and at the same time form a reverse water outlet effect, that is, the angle between the central axis of the side edge water outlet holes and the central axis of the tool handle is 90°.

[0095] In some embodiments,

[0096] The central axes of the plurality of side edge water outlet holes 4 are all perpendicular to the central axis of the knife handle 1 .

[0097] The present invention can spray water radially outward through such side edge water outlet holes, and can be effectively combined with the solutions of embodiments 1 and 2 to improve strength while achieving reverse water outlet.

[0098] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. An internally cooled milling cutter, characterized in that: include: A tool handle (1), a cutting section (7), an inner cooling hole (3) and a side edge water outlet hole (4), wherein the cutting section (7) is connected to the tool handle (1), the inner cooling hole (3) extends from an end of the tool handle (1) away from the cutting section (7) toward the inside of the tool handle (1), and extends to the inside of the cutting section (7), the cutting section (7) has an axial end away from the tool handle (1), an end of the inner cooling hole (3) located inside the cutting section (7) is not connected to the axial end of the cutting section (7), and the side edge water outlet hole (4) is arranged on the cutting section (7), one end of the side edge water outlet hole (4) is connected to the inner cooling hole (3), and the other end of the side edge water outlet hole (4) can discharge water in the direction of the tool handle (1).

2. The internally cooled milling cutter according to claim 1, characterized in that: The end of the side edge water outlet hole (4) that is connected to the inner cooling hole (3) is the first end, the water outlet end of the side edge water outlet hole (4) is the second end, and in the direction from the first end to the second end, the side edge water outlet hole (4) extends in a direction close to the shank (1).

3. The internally cooled milling cutter according to claim 2, characterized in that: The shank (1) and the cutting section (7) have the same central axis, which is the first central axis, and in a longitudinal section plane passing through the first central axis, the side blade water outlet (4) has a second central axis, and the first central axis intersects with the second central axis or intersects with the extension line of the second central axis, and the first central axis is a connecting line segment from the axial end of the shank (1) to the intersection position with the second central axis or the intersection position with the extension line of the second central axis, and an acute angle is provided between the connecting line segment and the second central axis of the side blade water outlet (4).

4. The internally cooled milling cutter according to claim 3, characterized in that: The acute angle has an angle range of 45° to 90°, the inner cooling hole (3) is located at the position of the first central axis and the extension direction of the inner cooling hole (3) is along the direction of the first central axis.

5. The internally cooled milling cutter according to claim 1, characterized in that: The cutting section (7) comprises a cutting edge (2) and a chip groove (6), wherein the chip groove (6) is located between two adjacent cutting edges (2), the side edge water outlet hole (4) is arranged in the chip groove (6), the side edge water outlet hole (4) is located inside the cutting section (7), one end of the side edge water outlet hole (4) is connected to the inner cooling hole (3), and the other end extends to the outer surface of the chip groove (6).

6. The internally cooled milling cutter according to claim 5, characterized in that: The chip removal groove (6) has a groove bottom, which is the position closest to the inner cooling hole (3), and the other end of the side edge water outlet hole (4) extends to the outer surface of the groove bottom of the chip removal groove (6).

7. The internally cooled milling cutter according to claim 5, characterized in that: There are at least two chip removal grooves (6) in the circumferential direction of the cutting section (7), and there are also at least two side edge water outlet holes (4), and the side edge water outlet holes (4) are arranged in a one-to-one correspondence with the chip removal grooves (6).

8. The internally cooled milling cutter according to claim 7, characterized in that: In the projection plane of the axial end face of the cutting section (7), there is an angle C between the central axes of two adjacent side cutting edge water outlet holes (4) in the circumferential direction, and the value range of C is 60° to 90°.

9. The internally cooled milling cutter according to claim 1, characterized in that: The cutting segment (7) is also provided with an end cutting edge (5) at the axial end away from the tool handle (1); the inner cooling hole (3) is not connected to the end cutting edge (5); and a minimum distance greater than 0 is provided between one end of the inner cooling hole (3) located inside the cutting segment (7) and the end cutting edge (5).

10. The internally cooled milling cutter according to claim 9, characterized in that: The minimum distance between one end of the inner cooling hole (3) located inside the cutting section (7) and the end cutting edge (5) is 3 to 5 mm.

11. The internally cooled milling cutter according to claim 1, characterized in that: The diameter of the side blade water outlet hole (4) is b, the diameter of the shank (1) is d, and the two satisfy the relationship: b=0.08d~0.1d.

12. The internally cooled milling cutter according to any one of claims 1 to 11, characterized in that: There are at least two side edge water outlet holes (4), and at least two side edge water outlet holes (4) are arranged at intervals along the direction of the central axis of the cutting segment (7); and / or, There are at least two side blade water outlet holes (4), and the central axes of at least two side blade water outlet holes (4) are located on the same straight line and are parallel to the central axis of the knife handle (1).

13. The internally cooled milling cutter according to any one of claims 1 to 12, characterized in that: There are at least two side edge water outlet holes (4), the central axes of at least two of the side edge water outlet holes (4) are parallel to the axial end face of the cutting segment (7), and the central axes of at least two of the side edge water outlet holes (4) are located in the same plane, so that the central axes of at least two of the side edge water outlet holes (4) are at the same distance from the axial end face of the cutting segment (7).

14. The internally cooled milling cutter according to claim 13, characterized in that: The central axes of the plurality of side blade water outlet holes (4) are all perpendicular to the central axis of the knife handle (1).

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