Reducing spiral chip removal milling cutter disc

Abstract

The invention relates to the technical field of cutting tools, and discloses a variable-diameter spiral chip removal milling cutter disc which comprises a connecting disc, a plurality of fixing rods are fixedly connected to the bottom of the connecting disc, a cutter disc is fixedly installed at the common bottom of the connecting discs, a milling cutter body is fixedly installed at the bottom of the cutter disc, and a plurality of bottom extending cutters are arranged on the outer ring of the milling cutter body. The space between the two bottom extending cutters extends outwards to form a spiral cutter, the bottom of each spiral cutter is movably connected with a reducing cutter, a plurality of pressurizing grooves are formed in the inner bottom of the milling cutter body, and a plurality of cooling holes are formed in the outer bottom of the milling cutter body. When the cutting depth is increased, the downward cutting depth is increased, the generated cutting heat is increased, and the dispersion quantity of the air outlet of the cooling hole is increased, so that the air blowing-away area is increased, the surface area of the air cooling variable-diameter cutter at the outlet of the cooling hole is increased, the cold cutting efficiency is improved, and the conditions of metal scraps and the variable-diameter cutter are avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cutting tools, in particular to a variable-diameter spiral chip removal milling cutter head. BACKGROUND

[0002] The milling cutter is used to cut parts by rotating, and then the water cooling equipment is used to cool the surface of the mechanical parts during the milling process. During processing, the existing milling cutter can change the cutting range by changing the diameter, and a large amount of material is removed during manufacturing, and the slot size is large, so the effective cutting edge of the required cutter is long. This further reflects the advantages of the disc milling cutter in material removal. In the case of materials that need to be processed, in order to improve the processing efficiency, a disc milling cutter with a larger diameter is usually selected. A larger milling cutter diameter can cover a larger processing area, thereby completing a larger area of processing task at one time and significantly improving the processing efficiency.

[0003] For the processing environment, the machine tool generally uses air cooling or water cooling to cool the processing parts and the cutter. The existing milling cutter is generally adjusted by a nut when changing the diameter. After adjustment, the rotating diameter of the milling cutter changes. There are more than one milling cutter on the cutter head, which is more troublesome to adjust. When the diameter of the milling cutter changes, the cutting fluid cannot cover the entire cutting position, which may cause problems such as local high temperature in the cutting area, accelerated tool wear, and decreased processing accuracy. In addition, when the metal being cut is soft, it is easy to adhere to the disc milling cutter during cutting. This phenomenon is usually referred to as "sticking cutter". Sticking cutter not only reduces the processing efficiency, but also may have a negative impact on the processing quality and tool life. During the cutting process, a large amount of heat is generated due to the friction between metals, which causes the temperature in the cutting area to rise. At high temperatures, soft metals are more likely to chemically react or physically adhere to the tool material. Based on this, a new milling cutter head is proposed. Therefore, we propose a variable-diameter spiral chip removal milling cutter head. SUMMARY

[0004] The present application aims to provide a variable-diameter spiral chip removal milling cutter head to solve the problems raised in the background art.

[0005] In order to achieve the above object, the present application provides the following technical scheme: A variable-diameter spiral chip removal milling cutter head, comprising a connecting disc, a plurality of fixed rods are fixedly connected to the bottom of the connecting disc, a cutter disc is fixedly installed at the common bottom of the plurality of connecting discs, a milling cutter body is fixedly installed at the bottom of the cutter disc, a plurality of bottom extension knives are arranged at the outer circle of the milling cutter body, a spiral knife in spiral shape is formed by extending outward between two bottom extension knives, a chip removal groove is formed by extending inward between the two bottom extension knives, a variable-diameter cutter is movably connected to the bottom of each spiral knife, a cross positioning tenon rod is movably connected to the variable-diameter cutter, a plurality of pressurizing grooves are arranged at the inner bottom of the milling cutter body, a plurality of cooling holes are arranged at the outer bottom of the milling cutter body, the cooling holes and the pressurizing grooves are in communication with each other, a plurality of air holes are arranged on each spiral knife, and each air hole is in communication with the inside of the milling cutter body, an air rod is rotatably connected to the middle of the cutter disc, and a plurality of air outlets are arranged in the middle of the air rod.

[0006] Preferably, the plurality of air holes are divided into multiple layers, the distance from each air hole in the same layer to the pressurizing groove is the same, and each air hole is away from the cutting edge of the spiral knife.

[0007] Preferably, the top of the cutter disc is detachably connected to the connecting disc, the middle of the air rod is rotatably connected to a limiting disc, the limiting disc is fixedly connected to the inside of the milling cutter body, a plurality of baffle discs are sequentially installed from top to bottom and fixedly installed at the bottom of the air rod, and the outer circle of each baffle disc is in abutment with the inner circle of the milling cutter body, and the outer circle of the baffle disc is in contact with the end of the air hole after the baffle disc is driven to rotate by the air rod.

[0008] Preferably, a threaded section is arranged at the bottom of the air rod, a second lifting disc is connected to the bottom of the air rod through the threaded section, a plurality of springs are fixedly connected to the bottom of the second lifting disc, a first lifting disc is fixedly connected to the common bottom of the plurality of springs, a connecting rod is fixedly connected to the bottom of the first lifting disc, one end of each cross positioning tenon rod penetrates through the bottom of the milling cutter body, and an extension rod is fixedly connected to one end of each cross positioning tenon rod, and a butt joint is fixedly installed at one end of each extension rod.

[0009] Preferably, the second lifting disc and the butt joint are movably connected and connected together by magnetic attraction, a pair of limiting grooves are arranged in the inner wall of the milling cutter body, and the first lifting disc and the second lifting disc are slidably connected together in the limiting grooves.

[0010] Preferably, a baffle ring is rotatably connected to the bottom of the milling cutter body, a threaded cylinder is sleeved on the inner circle of the baffle ring, a bottom screw rod is fixedly installed at the bottom of the air rod, the threaded cylinder is threadedly connected together with the air rod through the bottom screw rod, and the first lifting disc is in abutment with the bottom of the baffle ring after the baffle ring is rotated by the air rod.

[0011] Preferably, a plurality of sealing discs are fixedly connected to the bottom of the second lifting disc, a plurality of pressure distribution holes are arranged on the first lifting disc, and the outer circle of the bottom of the sealing disc is matched in size with the pressure distribution hole.

[0012] Preferably, a plurality of driving rods are penetrated through the limiting disc, the bottom of each driving rod abuts against the second lifting disc, and the top of the driving rod extends to the outside of the tool disc and abuts against the connecting disc.

[0013] Preferably, a plurality of air outlets are formed in the second lifting disc, and the second lifting disc is made of metal.

[0014] Preferably, the air rod is made of high-hardness alloy steel, and the bottom screw rod makes the air rod form a blind end with the opening direction upward.

[0015] Compared with the prior art, the present application has the following beneficial effects: When the device processes parts, the air pump is turned on, so that the gas enters the air rod, and then flows into the milling cutter body from the air outlet, and then the gas is discharged from the side of the milling cutter body through a plurality of air holes, which is used to blow off the debris on the chip groove and cool the spiral cutter body. In addition, part of the gas is extruded into the outside of the cooling hole through the plurality of pressurizing grooves, and finally the gas is directly discharged to the surface of the variable-diameter cutter through the cooling hole. The side of the variable-diameter cutter only covers half of the surface area of the cooling hole, so that the gas can not only blow off the debris on the surface of the variable-diameter cutter, but also cool the cutting part. The variable-diameter cutter has a plurality of installation change modes, so that the variable-diameter cutter can cut different products by changing. When the variable-diameter cutter changes, the side of the variable-diameter cutter is far away from the cooling hole after moving, the cutting depth increases, the cutting heat increases, the separation amount of the cooling hole outlet increases, the gas blowing area increases, the surface area of the cooling hole outlet cooled by the gas increases, the cooling efficiency is improved, and the metal debris is not adhered to the variable-diameter cutter. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present application; Figure 2 It is a schematic diagram of the overall structure of the present application; Figure 1 It is a schematic diagram of the enlarged structure of position A in the present application; Figure 3 It is a schematic diagram of the overall cross-sectional structure of the present application; Figure 4 It is a schematic diagram of the enlarged structure of position B in the present application; Figure 3 It is a schematic diagram of the air rod and the threaded cylinder structure of the present application; Figure 5 It is a schematic diagram of the milling cutter body structure of the present application; Figure 6 It is a schematic diagram of the variable-diameter cutter and the cross-positioning tenon rod structure of the present application; Figure 7 Figure 8 ​The first position diagram of the variable-diameter cutter on the milling cutter body of the application; Figure 9 The second position diagram of the variable-diameter cutter on the milling cutter body of the application; Figure 10 The third position diagram of the variable-diameter cutter on the milling cutter body of the application.

[0017] In the figure: 1-connection disc; 2-cutter disc; 201-connection disc, 3-fixed rod; 4-milling cutter body; 5-helix cutter; 6-air hole; 7-cross positioning tenon rod; 8-variable-diameter cutter; 9-extension rod; 10-cooling hole; 11-bottom extension cutter; 12-chip removal groove; 13-air rod; 14-limit disc; 15-driving rod; 16-air outlet; 17-stop disc; 18-first lifting disc; 19-second lifting disc; 20-spring; 21-pressure distribution hole; 22-sealing disc; 23-connection rod; 24-abutment; 25-threaded cylinder; 26-threaded section; 27-bottom screw rod; 28-stop ring; 29-pressurizing groove; 30-limiting groove. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the application. Obviously, the described embodiments are only a part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0019] Please refer to Figures 1-10This invention provides a technical solution: a variable diameter spiral chip-removing milling cutter disc, comprising a connecting disc 1, a plurality of fixing rods 3 fixedly connected to the bottom of the connecting disc 1, a cutter disc 2 fixedly mounted on the bottom of the plurality of fixing rods 3, a milling cutter body 4 fixedly mounted on the bottom of the cutter disc 2, a plurality of bottom extension cutters 11 formed on the outer circumference of the milling cutter body 4, a spiral cutter 5 extending outward between two bottom extension cutters 11, a chip-removing groove 12 extending inward between two bottom extension cutters 11, and a variable diameter cutter 8 movably connected to the bottom of each spiral cutter 5. A cross-shaped positioning rod 7 is dynamically connected. Multiple pressure grooves 29 are formed at the bottom of the inner part of the milling cutter body 4. Multiple cooling holes 10 are formed at the bottom of the outer part of the milling cutter body 4. The cooling holes 10 and the pressure grooves 29 are interconnected. Multiple air holes 6 are formed on each spiral cutter 5, and each air hole 6 communicates with the interior of the milling cutter body 4. An air rod 13 is rotatably connected to the center of the cutter disc 2. Multiple air outlets 16 are formed in the center of the air rod 13. The multiple air holes 6 are divided into multiple layers. Each air hole 6 in the same layer is equidistant from the pressure groove 29, and each air hole 6 is far from the cutting edge of the spiral cutter 5. The cross-shaped locating shank 7 is mounted on the variable-diameter cutter 8 via a sliding mechanism. The cross-shaped locating shank 7 includes a threaded cap, a threaded rod, and a pin, with the pin moving on the variable-diameter cutter 8. First, the cutter head 2 can be selectively matched to the connected machine tool. After the cutter head 2 is mounted on the machine tool, the milling cutter body 4 is vertically oriented. The movement trajectory of the milling cutter body 4 is controlled by a background program. Before machining the mechanical parts, the top of the air rod 13 is connected to the air pump pipe (the pipe is not shown). Then, each variable-diameter cutter 8 is mounted at the bottom of the milling cutter body 4. Next, the cross-shaped locating shank 7 is rotated into the variable-diameter cutter body. On the radial cutter 8, the variable diameter cutter 8 and the milling cutter body 4 are fitted together without being locked, allowing the variable diameter cutter 8 to change diameter. When the machine is processing parts, the air pump is turned on, allowing gas to enter from the air rod 13 and flow into the milling cutter body 4 from the air outlet 16. A portion of the gas is then discharged from the side of the milling cutter body 4 through multiple air holes 6 to blow away chips from the chip removal groove 12 and to cool the spiral cutter 5 body. Another portion of the gas is forced into the cooling holes 10 through multiple pressurization grooves 29. Finally, the gas is discharged directly onto the surface of the variable diameter cutter 8 through the cooling holes 10, as shown in the attached diagram. Figure 2 As shown, the side of the variable diameter cutter 8 only covers half of the surface area of ​​the cooling hole 10. Therefore, the gas can not only blow away the debris on the surface of the variable diameter cutter 8, but also cool the cutting area. Furthermore, through the attached... Figures 7-9As shown, the variable diameter cutter 8 can be changed as shown in the drawings, so that the variable diameter cutter 8 can be cut by changing the different products, when the milling cutter body 4 bottom variable diameter cutter 8 generates movement, so that the variable diameter cutter 8 of the rotating diameter changes, when the variable diameter cutter 8 moves in the milling cutter body 4 bottom, its side and cooling hole 10 far away, the cutting depth becomes larger, the cutting heat becomes larger, and the separation amount of the cooling hole 10 outlet increases, so that the gas blowing area becomes larger, so that the surface area of the cooling hole 10 outlet of the variable diameter cutter 8 is cooled, and the cutting efficiency is improved, and the metal scraps are not adhered to the variable diameter cutter 8. When processing special workpieces, the milling cutter body 4 is also required to cut the workpiece transversely, at which time the spiral cutter 5 needs to cut the workpiece horizontally according to the design instructions, and the air from the air hole 6 can also blow the processed workpiece surface to cool it and prevent the tool from breaking.

[0020] It is worth mentioning that since the air hole 6 and the cooling hole 10 can disperse the air force inside the milling cutter body 4, during the processing process, short-term processing may not cause abnormality, and long-term processing may cause small air force, so that the heat dissipation effect is not ideal, therefore: Further, the cutter disc 2 top is detachably connected with a connecting disc 201, the air rod 13 middle part is rotationally connected with a limiting disc 14, the limiting disc 14 and the milling cutter body 4 inside are fixedly connected, the air rod 13 bottom is fixedly installed with multiple blocking discs 17 installed from top to bottom, and the outer circle of each blocking disc 17 and the inner circle of the milling cutter body 4 are in abutment, and the outer circle of the blocking disc 17 and the end of the air hole 6 are in contact after the blocking disc 17 is driven to rotate by the air rod 13, the limiting disc 14 is used to prevent the air rod 13 from shaking inside the milling cutter body 4 during processing, and the blocking disc 17 can block most of the air holes 6 by the outer edge surface during the rotation of the air rod 13, so that most of the air is prevented from going out of the air hole 6 when the spiral cutter 5 does not process the workpiece, so that the air is cut off in the milling cutter body 4, and the cooling effect of the cooling hole 10 is improved.

[0021] Further, the air rod 13 bottom is provided with a threaded section 26, the air rod 13 bottom is connected with the second lifting disc 19 through the threaded section 26, the second lifting disc 19 bottom is fixedly connected with a plurality of springs 20, the common bottom of the plurality of springs 20 is fixedly connected with the first lifting disc 18, the first lifting disc 18 bottom is fixedly connected with the connecting rod 23, one end of each of the cross positioning tenon 7 penetrates through the milling cutter body 4 bottom, and one end of each of the cross positioning tenon 7 is fixedly connected with the extension rod 9, one end of each of the extension rod 9 is fixedly installed with the butt joint 24, the connecting rod 23 and the butt joint 24 are movably connected together, a plurality of air outlets are formed in the second lifting disc 19, and the second lifting disc 19 is made of metal, the baffle disc 17 at the bottom of the air rod 13 and the second lifting disc 19 are connected together through magnetic attraction; after the connecting disc 201 is manually disassembled, the limitation of the air rod 13 is released, then the air rod 13 is manually held during rotation, the second lifting disc 19 is lifted, the spring 20 is stretched and contracted, the first lifting disc 18 is lifted at the bottom of the air rod 13, and the connecting rod 23 is lifted, wherein the connecting rod 23 and the butt joint 24 are also connected together through magnetic attraction. Therefore, the connecting rod 23 can pull the butt joint 24 to pull the extension rod 9 outside the milling cutter body 4 to pull the variable-diameter cutter 8 to displace and change the angle, so that the angle and position of the plurality of variable-diameter cutters 8 are conveniently adjusted, and the operation difficulty is reduced.

[0022] Further, the second lifting disc 19 and the butt joint 24 are movably connected together through magnetic attraction, a pair of limiting grooves 30 are formed in the inner wall of the milling cutter body 4, the first lifting disc 18 and the second lifting disc 19 are slidably connected together with the limiting grooves 30, and the limiting grooves 30 prevent the second lifting disc 19 from rotating during rotation of the air rod 13, so that the position of the spring 20 is changed to damage the spring 20.

[0023] Further, the milling cutter body 4 bottom is rotatably connected with a baffle ring 28, the baffle ring 28 inner ring is sleeved with a threaded cylinder 25, the air rod 13 bottom is fixedly installed with a bottom screw rod 27, the threaded cylinder 25 is threadedly connected together with the air rod 13 through the bottom screw rod 27, and the baffle ring 28 abuts against the first lifting disc 18 bottom after the air rod 13 is rotated; the air rod 13 is made of high-hardness alloy steel, and the bottom screw rod 27 makes the air rod 13 form a blind end with the opening direction upward; the bottom screw rod 27 intercepts the gas in the air rod 13, which is beneficial to improve the air outlet amount of the air outlet 16, the baffle ring 28 prevents the first lifting disc 18 from descending after being threadedly matched with the bottom screw rod 27 through the threaded cylinder 25, the second lifting disc 19 locks the first lifting disc 18 through descending cooperation with the spring 20, the position and angle of the variable-diameter cutter 8 are fixed, the variable-diameter precision of the variable-diameter cutter 8 is improved, and the variable-diameter cutter 8 is prevented from shaking during machining, so that the tool collision condition is prevented.

[0024] Further, the bottom of the second lifting disc 19 is fixedly connected with a plurality of sealing discs 22, a plurality of pressure distribution holes 21 are formed in the first lifting disc 18, the bottom outer ring of the sealing disc 22 and the pressure distribution hole 21 are matched in size and diameter, when the spiral cutter 5 needs to be used, at this time, the variable diameter cutter 8 of the milling cutter body 4 is not used, and can be moved according to the Figure 7 pattern to the surface of the milling cutter body 4, and then the rotating air rod 13 is rotated again to control the threaded cylinder 25 to rotate and keep the milling cutter body 4 from moving, so that the second lifting disc 19 rises, the plurality of sealing discs 22 rise, the sealing disc 22 is moved to the inside of the pressure distribution hole 21, so that the gas in the upper part of the milling cutter body 4 is blocked by the sealing disc 22 and the pressure distribution hole 21 and cannot flow downward, so that the gas is cut off on the upper part of the milling cutter body 4, the air outlet of each air hole 6 is improved, and the ability of the milling cutter body 4 to distribute gas is improved.

[0025] Further, a plurality of driving rods 15 are penetrated through the limiting disc 14, the bottom of each driving rod 15 abuts against the second lifting disc 19, and the limiting disc 14 has guide rails, as shown in the accompanying drawings. Figure 3 When designed, the length of the guide rail needs to be a little longer, the driving rod 15 and the limiting disc 14 are slidingly connected, the top of the driving rod 15 extends to the outside of the cutter disc 2 and abuts against the connecting disc 201, after the position of the variable diameter cutter 8 is fixed, the position of the driving rod 15 can also be adjusted manually, so that the air hole 6 is not completely blocked by the blocking disc 17, thereby reducing the air outlet of the air hole 6.

[0026] It should be noted that, in the present text, relational terms such as first and second and the like can only be used to distinguish one entity or operation from another entity or operation, without necessarily requiring or implying any such actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such a process, method, article or equipment.

[0027] Although the embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, replacements and variations of the embodiments can be made without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A variable diameter helical chip conveying milling cutter disc, comprising a connecting disc (1), characterized in that: The bottom of the connecting disc (1) is fixedly connected to multiple fixing rods (3). The bottom of the multiple connecting discs (1) is fixedly mounted with a tool disc (2). The bottom of the tool disc (2) is fixedly mounted with a milling cutter body (4). The outer ring of the milling cutter body (4) is provided with multiple bottom extension cutters (11). A spiral cutter (5) is formed by extending outward between two bottom extension cutters (11). A chip removal groove (12) is formed by extending inward between two bottom extension cutters (11). A variable diameter cutter (8) is movably connected to the bottom of each spiral cutter (5). The variable diameter cutter (8) is movably connected to a cross-shaped positioning rod (7). The bottom of the inner part of the milling cutter body (4) is provided with multiple pressure grooves (29). The bottom of the outer part of the milling cutter body (4) is provided with multiple cooling holes (10). The cooling holes (10) and the pressure grooves (29) are interconnected. Each spiral cutter (5) is provided with multiple air holes (6), and each air hole (6) is connected to the inside of the milling cutter body (4). The middle part of the cutter disc (2) is rotatably connected to an air rod (13), and the middle part of the air rod (13) is provided with multiple air outlets (16).

2. The variable diameter spiral chip removal milling cutter disc according to claim 1, characterized in that: The multiple air holes (6) are divided into multiple layers. Each air hole (6) located in the same layer is at the same distance from the pressure groove (29), and each air hole (6) is far away from the edge of the spiral cutter (5).

3. A variable diameter spiral chip-discharging milling cutter disc according to claim 2, characterized in that: The top of the cutter disc (2) is detachably connected to a connecting disc (201), and the middle of the air rod (13) is rotatably connected to a limiting disc (14). The limiting disc (14) is fixedly connected to the inside of the milling cutter body (4). The bottom of the air rod (13) is fixedly installed with multiple baffles (17) installed sequentially from top to bottom. The outer ring of each baffle (17) abuts against the inner ring of the milling cutter body (4), and after the baffle (17) is driven to rotate by the air rod (13), its outer ring contacts the end of the air hole (6).

4. A variable diameter spiral chip-discharging milling cutter disc according to claim 3, characterized in that: The bottom of the air rod (13) is provided with a threaded section (26). The bottom of the air rod (13) is connected to a second lifting plate (19) through the threaded section (26). The bottom of the second lifting plate (19) is fixedly connected to a plurality of springs (20). The bottom of the plurality of springs (20) is fixedly connected to a first lifting plate (18). The bottom of the first lifting plate (18) is fixedly connected to a connecting rod (23). One end of each cross positioning mortise (7) passes through the bottom of the milling cutter body (4), and one end is fixedly connected to an extension rod (9). One end of each extension rod (9) is fixedly installed with a connector (24). The connecting rod (23) and the connector (24) are movably connected together.

5. A variable diameter spiral chip-discharging milling cutter disc according to claim 4, characterized in that: The second lifting plate (19) and the connector (24) are connected together by magnetic attraction. The inner wall of the milling cutter body (4) is provided with a pair of limiting grooves (30). The first lifting plate (18) and the second lifting plate (19) are slidably connected together with the limiting grooves (30).

6. A variable diameter spiral chip-discharging milling cutter disc according to claim 5, characterized in that: The bottom of the milling cutter body (4) is rotatably connected to a retaining ring (28), and a threaded cylinder (25) is sleeved on the inner ring of the retaining ring (28). A bottom screw (27) is fixedly installed at the bottom of the air rod (13). The threaded cylinder (25) is threadedly connected to the air rod (13) through the bottom screw (27). After the retaining ring (28) rotates through the air rod (13), it abuts against the bottom of the first lifting plate (18).

7. A variable diameter spiral chip-discharging milling cutter disc according to claim 6, characterized in that: The bottom of the second lifting plate (19) is fixedly connected with multiple sealing plates (22), and the first lifting plate (18) is provided with multiple pressure dividing holes (21). The outer ring of the bottom of the sealing plate (22) and the pressure dividing holes (21) are matched in size.

8. A variable diameter spiral chip removal milling cutter disc according to claim 7, characterized in that: Multiple drive rods (15) are passed through the limiting disk (14). The bottom of each drive rod (15) abuts against the second lifting disk (19), and the top of the drive rod (15) extends to the outside of the tool disk (2) and abuts against the connecting disk (201).

9. A variable diameter spiral chip-discharging milling cutter disc according to claim 8, characterized in that: The second lifting plate (19) has multiple air outlets and is made of metal. The baffle (17) at the bottom of the air rod (13) and the second lifting plate (19) are connected together by magnetic attraction.

10. A variable diameter helical chip-discharging milling cutter disc according to claim 6, characterized in that: The gas spring (13) is made of high-hardness alloy steel, and the bottom screw (27) makes the gas spring (13) form a blind end with the opening direction facing upward.

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