Disc milling cutter for large-plane high-speed milling

Abstract

The invention discloses a disc milling cutter for large-plane high-speed milling, which comprises a disc milling cutter body, the outer side of the disc milling cutter body is provided with a cutter groove, the inner wall of the cutter groove is provided with a blade for cutting, and the disc milling cutter body is also provided with a cutting fluid discharge unit; the cutting fluid discharging unit comprises a first fluid storage frame and a second fluid storage frame which are installed on the disc milling cutter body, cutting fluid is stored between the first fluid storage frame and the second fluid storage frame, and a plurality of sets of fluid inlet holes and fluid outlet holes are formed in the disc milling cutter body. Cutting fluid moves into the cutter groove to be in contact with each blade, a large amount of heat is taken away from a cutting area, so that the cutting temperature is reduced, the cutting fluid permeates among a cutter, cuttings and a workpiece to form a layer of lubricating film, friction between the cutter and the workpiece is reduced, cutting deformation is reduced, and growth of built-up edges and scales is restrained; and the situation that cutting fluid is difficult to make contact with the blade due to the large diameter of the disc milling cutter body is avoided.

Description

Technical Field

[0001] This invention relates to the field of milling cutter technology, specifically to a disc milling cutter for high-speed milling of large flat surfaces. Background Technology

[0002] A milling cutter is a rotary cutting tool used in milling to remove material. It rotates at high speed, contacts the workpiece, and generates cutting force to remove excess material, achieving the desired size and shape. Among milling cutters is the disc milling cutter, also known as a face milling cutter, which is widely used in milling. In the roughing of integral bladed disks, disc milling cutters need to remove a large amount of material, resulting in large slot sizes, thus requiring a longer effective cutting edge. This further highlights the advantages of disc milling cutters in material removal. For particularly large materials, larger diameter disc milling cutters are typically chosen to improve machining efficiency. A larger cutter diameter covers a larger machining area, allowing for the completion of larger areas in a single operation, significantly improving machining efficiency. Standard disc milling cutter diameters typically range from 50mm to 250mm, while special-type disc milling cutters may have even larger diameters, ranging from 300mm to 600mm or more. In practical applications, the appropriate cutter diameter can be selected based on the size of the workpiece, the capabilities of the machine tool, and the required machining accuracy and efficiency.

[0003] Because the diameter of the disc milling cutter is relatively large, and the cutting fluid cannot completely cover the cutting area, problems such as excessively high local temperatures in the cutting zone, accelerated tool wear, and decreased machining accuracy may occur. Furthermore, when the metal being cut is relatively soft, it tends to adhere to the disc milling cutter during the cutting process; this phenomenon is commonly known as "tool sticking." Tool sticking not only reduces machining efficiency but can also negatively impact machining quality and tool life. During cutting, the friction between metals generates a large amount of heat, causing the temperature in the cutting zone to rise. At high temperatures, soft metals are more likely to undergo chemical reactions or physical adhesion with the tool material. Based on this, a new disc milling cutter is proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a disc milling cutter for high-speed milling of large flat surfaces, so as to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a disc milling cutter for high-speed milling of large planes, comprising a disc milling cutter body, wherein the outer side of the disc milling cutter body has a tool groove, and the inner wall of the tool groove is fitted with a cutting insert for chip cutting, and a cutting fluid discharge unit is also installed on the disc milling cutter body;

[0006] The cutting fluid discharge unit includes a first fluid reservoir and a second fluid reservoir installed on the disc milling cutter body. The first fluid reservoir and the second fluid reservoir are used to accumulate cutting fluid. The disc milling cutter body has multiple sets of inlet holes and outlet holes. The inlet holes and outlet holes are connected. The space between the inlet holes and the first fluid reservoir and the second fluid reservoir is connected. The outlet holes are connected to the tool groove and are used to discharge the cutting fluid into the tool groove.

[0007] Furthermore, the upper end of the disc milling cutter body is provided with an annular groove, and the first and second liquid reservoirs are installed in the annular groove. The upper end faces of the first and second liquid reservoirs have annular gaps. The upper ends of the first and second liquid reservoirs are provided with mating rings, and the lower end of the mating rings has an annular cavity that extends between the first and second liquid reservoirs for filling the space between the first and second liquid reservoirs. The upper end of the mating rings is provided with a liquid inlet. When the first and second liquid reservoirs rotate with the disc milling cutter body, the mating rings remain stationary.

[0008] Furthermore, the first and second liquid storage racks are respectively attached to the inner walls of the inner and outer sides of the annular groove, and a rubber sealing ring is provided at the attachment point.

[0009] Furthermore, the inlet and outlet holes are also equipped with a clearing unit, which includes an elastic metal shaft that can extend and retract along the inlet and outlet holes. The outer walls of the elastic metal shaft near both ends are respectively fitted with a limiting ring one and a limiting ring two. The outer ends of the inlet and outlet holes are respectively provided with an inlet cavity and an outlet cavity. The inlet cavity and outlet cavity are respectively opened on the inner wall of the annular groove and the inner wall of the cutter groove. The inlet cavity and outlet cavity are respectively connected to the inlet and outlet holes. The limiting ring one and the limiting ring two are respectively fixed in the inlet cavity and the outlet cavity. The lower end of the mating ring is fixed with an inclined plate for squeezing the elastic metal shaft. When the disc milling cutter body rotates, the elastic metal shaft is intermittently squeezed by the inclined plate.

[0010] Furthermore, an inner support ring is fixed to the outer side of the elastic metal shaft. The inner support ring is sleeved inside the liquid outlet hole. The inner support ring is hollow to allow the cutting fluid to pass through. A support spring is fixed between the inner support ring and the second limiting ring. The support spring is sleeved inside the liquid outlet hole and is used to reset the elastic metal shaft.

[0011] Furthermore, both the first and second limiting rings are hollowed out to allow cutting fluid to pass through, and the positions where the first and second limiting rings contact the elastic metal shaft are smooth.

[0012] Furthermore, a plurality of circumferentially distributed partitions are fixed to one end of the elastic metal shaft extending from the liquid outlet hole. When the elastic metal shaft is not compressed, the partitions are in contact with the limiting ring.

[0013] Furthermore, the liquid outlet is viewed from above and extends outward at an angle, with the outer end of the liquid outlet pointing towards the blade.

[0014] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0015] 1. The cutting fluid moves into the tool groove and comes into contact with each insert, carrying away a large amount of heat from the cutting area, thereby reducing the cutting temperature. The cutting fluid penetrates between the tool, chips and workpiece, forming a lubricating film, reducing friction between the tool and workpiece, reducing cutting deformation, inhibiting the growth of built-up edge and burrs, improving the surface finish and precision of the machined surface, and avoiding the difficulty of contact between the cutting fluid and the insert due to the large diameter of the disc milling cutter body.

[0016] 2. The fluid outlet is angled towards the blade, which allows the cutting fluid to come into contact with the blade more effectively as it moves outward, thus preventing the blade temperature from rising sharply.

[0017] 3. The system is equipped with a clearing unit. The elastic metal shaft extends and retracts at intervals to clear blockages and prevent chips from entering the fluid outlet. Furthermore, the elastic metal shaft and partitions can push the chips at the outer end outwards, preventing excessive chips from hindering the outward movement of the cutting fluid and increasing the range of movement of the cutting fluid. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a partial exploded structural diagram of the present invention;

[0021] Figure 3 This is a partial cross-sectional schematic diagram of the cutting fluid discharge unit of the present invention;

[0022] Figure 4 This is a partial cross-sectional structural diagram of the disc milling cutter body of the present invention;

[0023] Figure 5 This is a partial structural diagram of the disc milling cutter body of the present invention;

[0024] Figure 6 This is the present invention. Figure 5 A magnified schematic diagram of the structure of part A in the diagram;

[0025] Figure 7 This is a schematic diagram of the orientation of the liquid outlet hole in this invention.

[0026] In the diagram: 1. Milling cutter body; 2. Tool groove; 3. Insert; 4. Coolant discharge unit; 41. Annular groove; 42. Inlet hole; 421. Inlet cavity; 43. Outlet hole; 431. Outlet cavity; 44. Reservoir first; 45. Reservoir second; 46. Fitting ring; 47. Inlet; 5. Unblocking unit; 51. Inclined plate; 52. Limiting ring first; 53. Limiting ring second; 54. Elastic metal shaft; 55. Inner support ring; 56. Support spring; 57. Spacer. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Please see Figures 1-7 This invention provides a technical solution: When the diameter of the disc milling cutter body 1 is large and the cutting fluid cannot completely cover the cutting area, it may lead to problems such as excessively high local temperature in the cutting area, accelerated tool wear, and decreased machining accuracy. Based on this, a disc milling cutter for high-speed milling of large planes is proposed, including a disc milling cutter body 1, a tool groove 2 on the outer side of the disc milling cutter body 1, and a cutting insert 3 for chip cutting installed on the inner wall of the tool groove 2. A cutting fluid discharge unit 4 is also installed on the disc milling cutter body 1. The cutting fluid discharge unit 4 is used to discharge the cutting fluid from different positions of the disc milling cutter body 1. When cutting metal, the position of the cutting fluid spray can be adjusted. In addition, when the disc milling cutter body 1 is cutting, the cutting fluid can completely cover the cutting area.

[0029] The cutting fluid discharge unit 4 includes a first fluid reservoir 44 and a second fluid reservoir 45 installed on the disc milling cutter body 1. The space between the first fluid reservoir 44 and the second fluid reservoir 45 is used to accumulate cutting fluid. The disc milling cutter body 1 has multiple sets of inlet holes 42 and outlet holes 43. The inlet holes 42 and outlet holes 43 are connected. The space between the inlet holes 42 and the first fluid reservoir 44 and the second fluid reservoir 45 is connected. The outlet holes 43 are connected to the tool groove 2 and are used to discharge cutting fluid into the tool groove 2. The cutting fluid is accumulated between the first fluid reservoir 44 and the second fluid reservoir 45 and then moves outward from the multiple sets of inlet holes 42 and outlet holes 43, so that the cutting fluid moves to different positions on the disc milling cutter body 1 to achieve contact with the cutting position and avoid excessive local temperature. Especially when cutting soft metals, the temperature rise can easily cause soft metals to adhere to the disc milling cutter body 1, which will affect subsequent cutting.

[0030] The upper end of the disc milling cutter body 1 has an annular groove 41. A first fluid reservoir 44 and a second fluid reservoir 45 are installed within the annular groove 41. The upper surfaces of the first fluid reservoir 44 and the second fluid reservoir 45 have annular gaps. A mating ring 46 is provided at the upper end of the first fluid reservoir 44 and the second fluid reservoir 45. The lower end of the mating ring 46 has an annular cavity extending between the first fluid reservoir 44 and the second fluid reservoir 45 for filling the space between them with cutting fluid. An inlet 47 is provided at the upper end of the mating ring 46. The first fluid reservoir 44 and the second fluid reservoir 45 move together with the disc milling cutter body 1. During rotation, the mating ring 46 remains stationary. The cutting fluid moves from the transmission pipe and enters the mating ring 46. The transmission pipe for the cutting fluid needs to be rigid to prevent the mating ring 46 from rotating due to friction. After the cutting fluid moves to the mating ring 46, it moves from the mating ring 46 to between the first accumulator 44 and the second accumulator 45, and then moves out from the inlet hole 42 and the outlet hole 43, which are relatively closed. Under the impact of the transmission pipe, the cutting fluid that moves to the cutting fluid discharge unit 4 can be discharged from the outlet hole 43, improving the discharge efficiency.

[0031] It should be noted that the liquid storage rack 44 and the liquid storage rack 45 are set separately to clamp the inclined plate 51, keep the mating ring 46 stable, and prevent displacement.

[0032] It should also be noted that the cutting fluid is discharged from the outlet hole 43 and is only located in the tool groove 2, which avoids the cutting fluid from contaminating the entire piece of metal being cut, facilitates the observation of the cutting position, and reduces the occurrence of dangerous accidents such as tool collision or workpiece detachment.

[0033] The first liquid reservoir 44 and the second liquid reservoir 45 are respectively attached to the inner and outer sides of the annular groove 41, and the two are attached to a rubber sealing ring to achieve a sealing effect and prevent the cutting fluid from moving outward through the gap under pressure.

[0034] During the cutting process, the generated chips can easily enter the groove 2 of the milling cutter body 1. When the chips are small enough, there is a possibility of clogging the liquid outlet 43. The liquid inlet 42 and the liquid outlet 43 are also provided with a clearing unit 5. The clearing unit 5 includes an elastic metal shaft 54 ​​that can extend and retract along the liquid inlet 42 and the liquid outlet 43. The outer walls of the elastic metal shaft 54 ​​near both ends are respectively fitted with a limiting ring 1 52 and a limiting ring 2 53. The outer ends of the liquid inlet 42 and the liquid outlet 43 are respectively provided with a liquid inlet cavity 421 and a liquid outlet cavity 421. The liquid outlet cavity 431, the liquid inlet cavity 421, and the liquid outlet cavity 431 are respectively opened on the inner wall of the annular groove 41 and the inner wall of the cutter groove 2. The liquid inlet cavity 421 and the liquid outlet cavity 431 are respectively connected to the liquid inlet hole 42 and the liquid outlet hole 43. The first limiting ring 52 and the second limiting ring 53 are respectively fixed in the liquid inlet cavity 421 and the liquid outlet cavity 431. The lower end of the mating ring 46 is fixed with an inclined plate 51 for squeezing the elastic metal shaft 54. When the disc milling cutter body 1 rotates, the elastic metal shaft 54 ​​is intermittently squeezed by the inclined plate 51.

[0035] An inner support ring 55 is fixed to the outer side of the elastic metal shaft 54. The inner support ring 55 is fitted into the outlet hole 43 and is hollow to allow cutting fluid to pass through. A support spring 56 is fixed between the inner support ring 55 and the second limiting ring 53. The support spring 56 is fitted into the outlet hole 43 and is used to reset the elastic metal shaft 54. The elastic metal shaft 54 ​​is limited by the first limiting ring 52 and the second limiting ring 53. When the elastic metal shaft 54 ​​is squeezed by the inclined plate 51, it can be squeezed outward and the support spring 56 is squeezed. Then, it returns to its original state under the action of the support spring 56. The elastic metal shaft 54 ​​was originally in a bent state. Because of its elasticity and the fact that it is limited, the elastic metal shaft 54 ​​can extend outward from the liquid outlet 43 and then return to its original position, thus realizing the extension and retraction of the elastic metal shaft 54 ​​during the rotation of the disc milling cutter body 1. It should be noted that the disc milling cutter body 1 has a relatively large diameter, so its rotation speed is relatively slow. The outwardly extending elastic metal shaft 54 ​​can be ensured to return to its original position under the action of the support spring 56, thus realizing the extension and retraction movement. This prevents chips from being ejected into the liquid outlet 43 during the cutting process and causing jamming, thus maintaining a clearing function. In addition, by separating the first limiting ring 52 and the second limiting ring 53, the clearing unit 5 can be removed and replaced, ensuring that the disc milling cutter body 1 is in an optimal cutting state.

[0036] Both limiting ring 1 52 and limiting ring 2 53 are hollow to allow cutting fluid to pass through. The contact points between limiting ring 1 52 and limiting ring 2 53 and the elastic metal shaft 54 ​​are smooth to ensure that the elastic metal shaft 54 ​​can achieve the extension and contraction function and reduce friction. In addition, limiting ring 1 52 and limiting ring 2 53 avoid obstructing the movement of cutting fluid.

[0037] Multiple circumferentially distributed partitions 57 are fixed to one end of the elastic metal shaft 54 ​​extending from the liquid outlet hole 43. When the elastic metal shaft 54 ​​is not compressed, the partitions 57 are in contact with the limiting ring 53. The partitions 57 can also extend and retract with the elastic metal shaft 54, thereby dispersing the cutting fluid and allowing the cutting fluid to contact the cutting tool 3 over a large area.

[0038] The liquid outlet 43 extends outward at an angle when viewed from above, with the outer end of the liquid outlet 43 pointing towards the blade 3, so that the cutting fluid can contact the blade 3 to the maximum extent.

[0039] The working principle of this invention is as follows: Cutting fluid is introduced into the inlet 47, which is transported through a pipe. The end of the pipe is locked to the inlet 47. The pipe is rigid, so the mating ring 46 is relatively fixed and will not rotate with the rotation of the disc milling cutter body 1. The cutting fluid entering the mating ring 46 moves between the first reservoir 44 and the second reservoir 45, and under the action of gravity and the centrifugal force generated by rotation, it moves from the inlet hole 42 and the outlet hole 43, causing the cutting fluid to move into the tool groove 2. During the cutting process of the disc milling cutter body 1, it interacts with each cutting tool 3. Contact with the cutting fluid effectively removes a significant amount of heat from the cutting area, thereby reducing the cutting temperature. This is crucial for reducing tool thermal wear, preventing workpiece deformation due to thermal expansion, and suppressing potential thermal cracks during the cutting process. The cutting fluid penetrates between the tool, chips, and workpiece, forming a lubricating film. This helps reduce friction between the tool and workpiece, thus lowering the cutting force. Good lubrication reduces cutting deformation, inhibits the growth of built-up edge and burrs, thereby improving the surface finish and precision of the machined surface. It also prevents the cutting fluid from being unable to contact the insert 3 due to the large diameter of the disc milling cutter body 1.

[0040] The outlet hole 43 is inclined and points towards the blade 3. When the cutting fluid moves outward, it can more effectively contact the cutting fluid with the blade 3 and avoid the temperature of the blade 3 rising sharply.

[0041] In addition, by setting up the unblocking unit 5, during the rotation of the disc milling cutter body 1, the mating ring 46 at its upper end is prevented from rotating under the action of the cutting fluid delivery pipe, thereby realizing the intermittent compression between the elastic metal shaft 54 ​​and the inclined plate 51. After compression, the elastic metal shaft 54 ​​pushes the support spring 56, causing the partition 57 to move outward. Then, the elastic metal shaft 54 ​​returns to its original position under the action of the support spring 56, realizing the intermittent extension and retraction of the elastic metal shaft 54. When chips accumulate in the tool groove 2 and are difficult to remove, there is a possibility of the fluid outlet 4 being blocked. 3. The possibility of blockage. Even if it does not block, it will reduce the discharge efficiency of the fluid outlet 43. The elastic metal shaft 54 ​​extends and retracts to clear the blockage and prevent chips from entering the fluid outlet 43. Secondly, the elastic metal shaft 54 ​​and the partition 57 can also push the chips at the outer end outward to prevent excessive chips from making it difficult for the cutting fluid to move outward. The partition 57 also has the function of dispersing the cutting fluid, which can increase the movement range of the cutting fluid moving outward. The partition 57 pushes outward at intervals, so it will not block the fluid outlet 43.

[0042] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0043] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A disc milling cutter for high-speed milling of large surfaces, comprising a disc milling cutter body (1), the outer side of the disc milling cutter body (1) having a cutter groove (2), the inner wall of the cutter groove (2) being provided with a blade (3) for chip cutting, characterized in that: The disc milling cutter body (1) is also provided with a cutting fluid discharge unit (4); The cutting fluid discharge unit (4) comprises a first liquid storage frame (44) and a second liquid storage frame (45) mounted on the disc milling cutter body (1); the first liquid storage frame (44) and the second liquid storage frame (45) are used to store cutting fluid; the disc milling cutter body (1) is provided with a plurality of groups of liquid inlet holes (42) and liquid outlet holes (43); the liquid inlet holes (42) and the liquid outlet holes (43) are connected; the liquid inlet holes (42) are connected to the space between the first liquid storage frame (44) and the second liquid storage frame (45); the liquid outlet holes (43) are connected to the tool groove (2) and are used to discharge the cutting fluid into the tool groove (2).

2. The disc milling cutter for large plane high-speed milling according to claim 1, characterized in that: The upper end of the disc milling cutter body (1) is provided with an annular groove (41) arranged in an annular shape. The first liquid storage frame (44) and the second liquid storage frame (45) are installed in the annular groove (41). The upper end surfaces of the first liquid storage frame (44) and the second liquid storage frame (45) have annular gaps. The upper ends of the first liquid storage frame (44) and the second liquid storage frame (45) are provided with matching rings (46). The lower ends of the matching rings (46) have an annular cavity, and the cavity extends between the first liquid storage frame (44) and the second liquid storage frame (45) for injecting cutting fluid between the first liquid storage frame (44) and the second liquid storage frame (45). The upper end of the matching ring (46) is provided with a liquid inlet (47). When the first liquid storage frame (44) and the second liquid storage frame (45) rotate with the disc milling cutter body (1), the matching ring (46) remains stationary.

3. The disc milling cutter for large plane high-speed milling according to claim 2, characterized in that: The first liquid storage frame (44) and the second liquid storage frame (45) are respectively fitted with the inner walls on both sides of the annular groove (41), and a layer of rubber sealing ring is provided at the position where the two are fitted.

4. The disc milling cutter for large plane high-speed milling according to claim 2, characterized in that: A dredging unit (5) is further provided in the liquid inlet hole (42) and the liquid outlet hole (43). The dredging unit (5) comprises an elastic metal shaft (54) that can be extended and retracted along the liquid inlet hole (42) and the liquid outlet hole (43). The outer walls of the elastic metal shaft (54) near both ends are respectively sleeved with a first limiting ring (52) and a second limiting ring (53). The outer ends of the liquid inlet hole (42) and the liquid outlet hole (43) are respectively provided with a liquid inlet outer cavity (421) and a liquid outlet outer cavity (431). The liquid inlet outer cavity (421) and the liquid outlet outer cavity (431) are respectively opened. The inner wall of the annular groove (41) and the inner wall of the cutter groove (2) are arranged. The liquid inlet outer cavity (421) and the liquid outlet outer cavity (431) are respectively connected to the liquid inlet hole (42) and the liquid outlet hole (43). The first limiting ring (52) and the second limiting ring (53) are respectively fixed in the liquid inlet outer cavity (421) and the liquid outlet outer cavity (431). The lower end of the matching ring (46) is fixed with an inclined plate (51) for squeezing the elastic metal shaft (54). When the disc milling cutter body (1) rotates, the elastic metal shaft (54) and the inclined plate (51) are intermittently squeezed.

5. The disc milling cutter for large plane high-speed milling according to claim 4, characterized in that: An inner support ring (55) is fixed to the outer side of the elastic metal shaft (54), and the inner support ring (55) is sleeved into the liquid outlet hole (43). The inner support ring (55) is hollow and is used for cutting fluid to pass through. A support spring (56) is fixed between the inner support ring (55) and the second limiting ring (53), and the support spring (56) is sleeved into the liquid outlet hole (43). The support spring (56) is used to reset the elastic metal shaft (54).

6. The disc milling cutter for large plane high-speed milling according to claim 4, characterized in that: The first limiting ring (52) and the second limiting ring (53) are both hollow and are used for the cutting fluid to pass through. The positions where the first limiting ring (52) and the second limiting ring (53) contact the elastic metal shaft (54) are smooth.

7. The disc milling cutter for large plane high-speed milling according to claim 4, characterized in that: A plurality of circumferentially distributed spacers (57) are fixed to one end of the elastic metal shaft (54) extending from the liquid outlet hole (43); when the elastic metal shaft (54) is not squeezed, the spacers (57) are in contact with the second limiting ring (53).

8. The disc milling cutter for large plane high-speed milling according to claim 4, characterized in that: The liquid outlet hole (43) extends outwardly in an inclined manner when viewed from above, and the outer end of the liquid outlet hole (43) points to the blade (3).

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