Disc-shaped gear milling cutter

Abstract

The utility model relates to the technical field of milling cutters, and discloses a disc-shaped gear milling cutter which comprises a mounting ring, a plurality of blades are fixedly connected to the periphery of the outer wall of the mounting ring, chamfers are formed in the outer walls of the blades, a plurality of limiting slots are formed in the periphery of the inner wall of the mounting ring, and the limiting slots are arranged in the mounting ring. Inserting plates are slidably connected into the multiple limiting inserting grooves, fixing rings are fixedly connected between the adjacent inserting plates, a first fixing piece is fixedly connected to the bottom of the inner wall of the mounting ring, and a second fixing piece is slidably connected to the top of the inner wall of the mounting ring. According to the utility model, the plurality of plug boards on the fixed ring are aligned with the limiting slots for sliding installation, the fixed ring is clamped by matching the fixed sheet I with the fixed sheet II, so that the fixed ring is arranged between the fixed sheet I and the fixed sheet II, and the connecting bolt penetrates through the fixed sheet I, the fixed sheet II and the fixed ring and is connected with the nut II; and complete reinforcement treatment is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of milling cutters, in particular to a disc-shaped gear milling cutter. Background Art

[0002] A disc-shaped gear milling cutter is a tool used for milling gears. Its shape is disc-shaped and it is mainly used for machining various types of gears. This kind of milling cutter has high machining accuracy and efficiency, and can meet the machining requirements of various precision gears. The structural design of the disc-shaped gear milling cutter is reasonable, with good cutting performance and unique design, which is convenient for machining sampling grooves.

[0003] After retrieval, the Chinese patent publication number is: CN102091817A, which discloses a composite milling cutter. This kind of cutter has high efficiency, high strength and long service life. It includes a cutter handle or a positioning hole and a cutter head. The cutter head is integrally provided with a plurality of cutting blades or cutting bodies. On each cutting blade or cutting body, there is a cutting surface. The characteristics are that on the 1 cutting surface of the composite milling cutter, a stepped composite cutting surface or a composite side cutting surface and a stepped composite rear cutting surface are convexly arranged to form a stepped composite cutting edge or a composite side cutting edge, and at least one stepped stepped edge or a splitting edge is formed; at least one notch edge is arranged on the 2 cutting edge or the side cutting edge, and the opening extends towards the cutting surface or the side cutting surface or the rear cutting surface to form at least one groove; at least one notch edge is arranged on the cutting edge or the side cutting edge or the rear cutting edge or the composite cutting edge or the composite side cutting edge or the composite rear cutting edge, and the opening extends towards the cutting surface or the side cutting surface or the rear cutting surface to form at least one groove. However, in actual use, there are still problems such as blade wear and difficulty in replacement for gear milling cutters, which increases the use cost. Therefore, a disc-shaped gear milling cutter is proposed to solve the above problems. Content of the Utility Model

[0004] In order to make up for the above deficiencies, the utility model provides a disc-shaped gear milling cutter, aiming to improve the problems of blade wear and difficulty in replacement in the prior art, which increases the use cost.

[0005] To achieve the above object, the utility model adopts the following technical solutions: a disc-shaped gear milling cutter, including an installation ring, the outer wall of the installation ring is fixedly connected with a plurality of blades around, the outer walls of the plurality of blades are all provided with cutting angles, the inner wall of the installation ring is provided with a plurality of limiting slots around, a plugging plate is slidably connected inside each of the plurality of limiting slots, a fixing ring is fixedly connected between adjacent ones of the plurality of plugging plates, a fixing piece one is fixedly connected to the bottom of the inner wall of the installation ring, a fixing piece two is slidably connected to the top of the inner wall of the installation ring, a plurality of connecting holes one are provided on the adjacent sides of the fixing piece one and the fixing piece two, a plurality of connecting holes two are provided around the top of the fixing ring, connecting bolts are threadedly connected inside the connecting holes one, the bottom end of the connecting bolt penetrates through the inner wall of the connecting hole two and is threadedly connected with a nut two, and a sealing mechanism is arranged inside the installation ring.

[0006] Through the above technical solutions: the installation ring is limited through the limiting slots, the fixing ring is placed on the fixing piece one, and the whole installation ring and the fixing ring are fixed through the cooperation of the fixing piece two and the connecting bolts. In this way, not only the firmness of the blades during use can be ensured, but also the blades on the fixing ring can be replaced by removing the connecting bolts.

[0007] As a further description of the above technical solutions:

[0008] The sealing mechanism includes a plurality of bolts, a plurality of screw holes are provided around the top of the fixing ring, the bottom ends of the plurality of bolts are threadedly connected inside the screw holes, the top end of the bolt is fixedly connected with a screw head, an installation groove is provided on the outer wall of the screw head, a sealing ring one is fixedly connected inside the installation groove, the bottom end of the bolt is threadedly connected with a nut one, and a sealing ring two is fixedly connected to the outer wall of the nut one.

[0009] Through the above technical solutions: an installation groove is provided on the outer wall of the screw head, the sealing ring is installed and fixed through the installation groove. When the screw head rotates to the inner wall of the screw hole, the inner wall of the screw hole is in close fit with the sealing ring, so as to avoid moisture from penetrating into the screw hole and the surface of the bolt, resulting in rust on the surface of the bolt, and thus moisture penetration can be avoided, improving the service life of the bolt.

[0010] As a further description of the above technical solutions:

[0011] The sealing mechanism further includes a plum blossom groove, the bottom of the plum blossom groove is provided on the top of the screw head, and the outer wall of the sealing ring one is arranged on the inner wall of the fixing piece two.

[0012] Through the above technical solutions: the plum blossom groove facilitates the worker to use a special tool to rotate and reinforce it.

[0013] As a further description of the above technical solutions:

[0014] The inner wall of the fixed ring is provided with a wear-resistant layer, and the blade and the mounting ring are integrally designed.

[0015] Through the above technical solution: A wear-resistant layer is provided inside the fixed ring, and the wear-resistant layer can prevent the fixed ring from being worn and consumed during the installation process.

[0016] As a further description of the above technical solution:

[0017] The inner wall of the fixed ring is provided with a limiting groove, and the outer wall of the fixed ring is made smooth.

[0018] Through the above technical solution: The limiting groove can facilitate the installation of the fixed ring on a dedicated device for use.

[0019] As a further description of the above technical solution:

[0020] The outer wall of the blade is provided with a wear-resistant outer layer, and a hardness enhancement layer is provided inside the wear-resistant outer layer.

[0021] Through the above technical solution: The wear-resistant outer layer on the outer wall of the blade can effectively resist wear and scratches during daily use, extending the overall service life of the blade. The hardness enhancement layer can withstand greater pressure and impact during cutting and processing, thus ensuring the stable performance and efficient performance of the blade under various harsh conditions.

[0022] As a further description of the above technical solution:

[0023] A toughness transition layer is provided inside the hardness enhancement layer, and a base core layer is provided inside the toughness transition layer.

[0024] Through the above technical solution: The toughness transition layer ensures a good transition between hardness and toughness, and the base core layer provides the stability and support of the overall structure.

[0025] As a further description of the above technical solution:

[0026] The inner diameter of the first connecting hole is adapted to the diameter of the connecting bolt, and multiple first connecting holes are all symmetrically designed.

[0027] Through the above technical solution: Multiple first connecting holes are all symmetrically designed, which can ensure that the forces borne by each first connecting hole are evenly distributed during the connection process, thereby improving the reliability and durability of the overall structure.

[0028] The utility model has the following beneficial effects:

[0029] 1. In the present utility model, by aligning multiple plug-in boards on the fixing ring with the limit slots and sliding them for installation, the rapid installation and positioning of the fixing ring are achieved. The fixing ring is clamped by the first fixing piece and the second fixing piece, and the fixing ring is arranged between the first fixing piece and the second fixing piece. The connecting bolt is inserted through the second connecting hole and the first connecting hole, and by passing the connecting bolt through the first fixing piece, the second fixing piece and the fixing ring and connecting it with the second nut, the complete reinforcement treatment is realized. In this way, not only the firmness during the use of the blade can be ensured, but also the blade on the fixing ring can be replaced by removing the connecting bolt.

[0030] 2. In the present utility model, a number of screw holes are evenly opened at the top edge of the fixing ring. The screw holes are in close fit with the bolts, thereby realizing the firm connection between the bolts and the fixing ring. An installation groove is opened on the outer wall of the screw head. After the bolt is completely fixed, the screw head can be in close fit with the first sealing ring, thereby realizing the perfect sealing of the top position of the screw hole. The use of the first nut and the bolt, and the second sealing ring provide double sealing guarantees. Description of the Drawings

[0031] Figure 1 is a three-dimensional view of the disc-shaped gear milling cutter proposed by the present utility model;

[0032] Figure 2 is an exploded view of the disc-shaped gear milling cutter proposed by the present utility model;

[0033] Figure 3 is a split view of the disc-shaped gear milling cutter proposed by the present utility model;

[0034] Figure 4 is a structural schematic diagram of the sealing mechanism of the disc-shaped gear milling cutter proposed by the present utility model;

[0035] Figure 5 is a cross-sectional view of the disc-shaped gear milling cutter proposed by the present utility model.

[0036] Legend Explanation:

[0037] 1. Installation ring; 2. Sealing mechanism; 201. Screw hole; 202. Bolt; 203. Screw head; 204. Plum blossom groove; 205. Installation groove; 206. First sealing ring; 207. First nut; 208. Second sealing ring; 3. Blade; 4. Chamfer; 5. Limit slot; 6. Plug-in board; 7. Fixing ring; 8. First fixing piece; 9. First connecting hole; 10. Second fixing piece; 11. Wear-resistant layer; 12. Connecting bolt; 13. Second nut; 14. Limit groove; 15. Second connecting hole; 16. Wear-resistant outer layer; 17. Hardness enhancement layer; 18. Toughness transition layer; 19. Core layer. Detailed Embodiment

[0038] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0039] Referring to Figure 1 , Figure 2 and Figure 3 , an embodiment provided by the present utility model: a disc-shaped gear milling cutter, including an installation ring 1. A plurality of blades 3 are fixedly connected to the outer periphery of the outer wall of the installation ring 1. Cutting corners 4 are provided on the outer walls of the plurality of blades 3. The material of the blades 3 is a hard alloy with high hardness and high wear resistance. The cutting edges of the blades 3 are subjected to special heat treatment and coating treatment to improve their high temperature resistance and wear resistance; a plurality of limit slots 5 are provided on the inner periphery of the inner wall of the installation ring 1. A plurality of plug-in plates 6 are slidably connected to the inside of the plurality of limit slots 5. A fixing ring 7 is fixedly connected between the adjacent plurality of plug-in plates 6. By sliding and installing the plurality of plug-in plates 6 on the fixing ring 7 into the limit slots 5, the fixing ring 7 can be quickly installed and positioned, and at the same time, the firmness and stability of the blades 3 during high-speed rotation are ensured; a fixing piece one 8 is fixedly connected to the bottom of the inner wall of the installation ring 1, and a fixing piece two 10 is slidably connected to the top of the inner wall of the installation ring 1. A plurality of connection holes one 9 are provided on the adjacent sides of the fixing piece one 8 and the fixing piece two 10. A plurality of connection holes two 15 are provided on the periphery of the top of the fixing ring 7. Connection bolts 12 are threadedly connected to the inside of the connection holes one 9. The fixing ring 7 is clamped by the fixing piece one 8 and the fixing piece two 10, so that the fixing ring 7 is arranged between the fixing piece one 8 and the fixing piece two 10, and the connection bolts 12 are inserted through the connection holes two 15 and the connection holes one 9, so that the fixing piece one 8, the fixing piece two 10 and the fixing ring 7 can be tightly connected together; the bottom end of the connection bolt 12 penetrates through the inner wall of the connection hole two 15 and is threadedly connected to a nut two 13. By passing the connection bolt 12 through the fixing piece one 8, the fixing piece two 10 and the fixing ring 7 and connecting it to the nut two 13, complete reinforcement treatment is realized to improve the firmness; a sealing mechanism 2 is arranged inside the installation ring 1, a wear-resistant layer 11 is arranged on the inner wall of the fixing ring 7, the blades 3 and the installation ring 1 are integrally designed, a limit groove 14 is provided on the inner wall of the fixing ring 7, the outer wall of the fixing ring 7 is made smooth, the inner diameter size of the connection holes one 9 is matched with the diameter size of the connection bolts 12, and the plurality of connection holes one 9 are all symmetrically designed;

[0040] Specifically, a plurality of blades 3 are fixedly connected to the outer wall periphery of the mounting ring 1. Chamfers 4 are provided on the outer walls of these blades 3 to facilitate precise cutting operations. The material of the blades 3 is a cemented carbide with high hardness and high wear resistance, which can withstand high-intensity cutting operations without being easily damaged. To further improve the high-temperature resistance and wear resistance of the blades 3, their cutting edges have undergone special heat treatment and coating treatment; a plurality of limit slots 5 are provided on the inner wall periphery of the mounting ring 1, and plug-in plates 6 are slidably connected to the interiors of these limit slots 5. A fixing ring 7 is fixedly connected between adjacent ones of the plurality of plug-in plates 6; by sliding and installing the plurality of plug-in plates 6 on the fixing ring 7 into the limit slots 5, rapid installation and positioning of the fixing ring 7 can be achieved; this design not only facilitates the installation process but also ensures the firmness and stability of the blades 3 during high-speed rotation; a fixing piece one 8 is fixedly connected to the bottom of the inner wall of the mounting ring 1, while a fixing piece two 10 is slidably connected to the top of the inner wall of the mounting ring 1. A plurality of first connection holes 9 are provided on the adjacent sides of the fixing piece one 8 and the fixing piece two 10, and a plurality of second connection holes 15 are provided on the top periphery of the fixing ring 7. Connection bolts 12 are threadedly connected to the interiors of the first connection holes 9; by clamping the fixing ring 7 with the fixing piece one 8 and the fixing piece two 10, such that the fixing ring 7 is disposed between the fixing piece one 8 and the fixing piece two 10, and inserting the connection bolts 12 through the second connection holes 15 and the first connection holes 9, the fixing piece one 8, the fixing piece two 10, and the fixing ring 7 can be tightly connected together, thereby ensuring the stability and reliability of the entire structure; the bottom end of the connection bolt 12 penetrates the inner wall of the second connection hole 15 and is threadedly connected to a second nut 13. By passing the connection bolt 12 through the fixing piece one 8, the fixing piece two 10, and the fixing ring 7 and connecting it to the second nut 13, complete reinforcement treatment is achieved, thereby further improving the firmness of the entire device; a wear-resistant layer 11 is provided on the inner wall of the fixing ring 7 to reduce wear and extend its service life. The blades 3 and the mounting ring 1 adopt an integrated design, making the overall structure more robust and durable; a limit groove 14 is provided on the inner wall of the fixing ring 7 to ensure that the blades 3 do not displace during high-speed rotation; the outer wall of the fixing ring 7 is made smooth to reduce wind resistance and noise generated during high-speed rotation. The inner diameter of the first connection holes 9 is adapted to the diameter of the connection bolts 12, ensuring the tightness of the connection. The plurality of first connection holes 9 are all symmetrically designed to ensure the uniformity and balance of the entire device when stressed.

[0041] Refer to Figure 1 , Figure 3 and Figure 4, the sealing mechanism 2 includes a plurality of bolts 202. Thread holes 201 are provided around the top of the fixing ring 7. The bottom ends of the plurality of bolts 202 are threadedly connected to the inside of the thread holes 201. The bolts 202 are connected and fixed through the thread holes 201 provided on the fixing ring 7 to ensure the firmness of the fixing ring 7 during use; the top end of the bolt 202 is fixedly connected to a screw head 203. An installation groove 205 is provided on the outer wall of the screw head 203. A first sealing ring 206 is fixedly connected to the inside of the installation groove 205. By installing the first sealing ring 206 on the outer wall of the screw head 203, after the bolt 202 is completely fixed, the screw head 203 cooperates with the first sealing ring 206 to completely fit the top position of the thread hole 201, achieving a complete sealing effect; the bottom end of the bolt 202 is threadedly connected to a first nut 207. A second sealing ring 208 is fixedly connected to the outer wall of the first nut 207. The cooperation of the bolt 202 and the first nut 207 can make the entire fixing structure more firm. At the same time, the second sealing ring 208 also provides a good sealing effect; the sealing mechanism 2 further includes a plum blossom groove 204. The bottom of the plum blossom groove 204 is provided on the top of the screw head 203. The outer wall of the first sealing ring 206 is arranged on the inner wall of the second fixing piece 10;

[0042] Specifically, a number of thread holes 201 are evenly provided at the top edge of the fixing ring 7. The purpose of these thread holes 201 is to accommodate and fix the bolts 202; the bottom end of each bolt 202 has threads, and these threads are closely matched with the threads inside the thread holes 201, thus realizing the firm connection between the bolt 202 and the fixing ring 7. This connection method ensures that the fixing ring 7 can remain stable during actual use and will not loosen or fall off easily; to enhance the sealing effect, the top end of each bolt 202 is fixedly connected to a screw head 203. Installation grooves 205 are provided on the outer wall of the screw head 203. These installation grooves 205 are used to accommodate the first sealing ring 206. The first sealing ring 206 is fixedly installed inside the installation groove 205, ensuring that after the bolt 202 is completely fixed, the screw head 203 and the first sealing ring 206 can be closely attached, thus realizing the perfect sealing of the top position of the thread hole 201. This design not only ensures the fixing effect of the bolt 202 but also provides additional sealing protection through the first sealing ring 206, ensuring the sealing performance of the overall structure; in addition, the bottom end of the bolt 202 is threadedly connected to the first nut 207. A second sealing ring 208 is fixedly connected to the outer wall of the first nut 207, making the entire fixing structure more firm. The sealing effect is further enhanced through the second sealing ring 208. The cooperation of the first nut 207 and the bolt 202 ensures the stability and reliability of the connection. At the same time, the presence of the second sealing ring 208 also provides double sealing protection; the sealing mechanism 2 further includes plum blossom grooves 204. The bottoms of these plum blossom grooves 204 are provided on the top of the screw head 203. The design of the plum blossom grooves 204 not only helps with the installation and removal of the bolt 202 but also provides an additional gripping surface, making the operation more convenient.

[0043] Reference Figure 1 , Figure 2 and Figure 5 The outer wall of the blade 3 is provided with a wear-resistant outer layer 16, the inner part of the wear-resistant outer layer 16 is provided with a hardness enhancement layer 17, the inner part of the hardness enhancement layer 17 is provided with a toughness transition layer 18, and the inner part of the toughness transition layer 18 is provided with a base core layer 19;

[0044] Specifically, a wear-resistant outer layer 16 is provided on the outer wall portion of the blade 3. The main function of the wear-resistant outer layer 16 is to improve the service life and wear resistance of the blade 3. Inside the wear-resistant outer layer 16, a hardness enhancement layer 17 is further provided. The existence of the hardness enhancement layer 17 is to improve the overall hardness of the blade, making it more stable and efficient during the cutting process; immediately inside the hardness enhancement layer 17, there is a toughness transition layer 18. The function of the toughness transition layer 18 is to provide a certain buffer when the blade is impacted, so as to prevent the blade from being damaged due to brittle fracture; finally, inside the toughness transition layer 18 is the core part of the blade, the base core layer 19. The base core layer 19 not only provides the necessary support and strength for the entire blade, but also ensures the overall stability and durability of the blade during use, and ensures its high efficiency and durability in cutting operations.

[0045] Working principle: Firstly, a plurality of blades 3 are fixedly connected to the outer periphery of the outer wall of the mounting ring 1. Chamfers 4 are provided on the outer walls of these blades 3 to facilitate precise cutting operations. The material of the blades 3 is a cemented carbide with high hardness and high wear resistance, which can withstand high-intensity cutting operations and is not easily damaged. By sliding and installing the plurality of plug-in plates 6 on the fixed ring 7 into the limit slots 5, rapid installation and positioning of the fixed ring 7 can be achieved. The fixed ring 7 is clamped by the fixing piece one 8 and the fixing piece two 10, so that the fixed ring 7 is arranged between the fixing piece one 8 and the fixing piece two 10. The connecting bolt 12 is inserted through the connecting hole two 15 and the connecting hole one 9, enabling the fixing piece one 8, the fixing piece two 10 and the fixed ring 7 to be tightly connected together, thereby ensuring the stability and reliability of the entire structure; the bottom end of the connecting bolt 12 penetrates the inner wall of the connecting hole two 15 and is threadedly connected with a nut two 13. By passing the connecting bolt 12 through the fixing piece one 8, the fixing piece two 10 and the fixed ring 7 and connecting it with the nut two 13, complete reinforcement treatment is achieved. In this way, not only the firmness of the blades 3 during use can be ensured, but also the blades 3 on the fixed ring 7 can be replaced by removing the connecting bolt 12; and a plurality of screw holes 201 are evenly provided at the top edge of the fixed ring 7. The screw holes 201 are in close fit with the bolts 202, thereby realizing the firm connection between the bolts 202 and the fixed ring 7. An installation groove 205 is provided on the outer wall of the screw head 203. The sealing ring one 206 is fixedly installed inside the installation groove 205, ensuring that after the bolt 202 is completely fixed, the screw head 203 and the sealing ring one 206 can be closely attached, thereby achieving perfect sealing of the top position of the screw hole 201. The use of the nut one 207 and the bolt 202, and the sealing ring two 208 provide double sealing guarantees.

[0046] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. Disc-shaped gear milling cutter, including an installation ring (1), characterized in that: A plurality of blades (3) are fixedly connected to the outer wall periphery of the mounting ring (1). Chamfered corners (4) are provided on the outer walls of the plurality of blades (3). A plurality of limiting slots (5) are provided on the inner wall periphery of the mounting ring (1). Plugging plates (6) are slidably connected to the interiors of the plurality of limiting slots (5). A fixing ring (7) is fixedly connected between adjacent ones of the plurality of plugging plates (6). A first fixing piece (8) is fixedly connected to the bottom of the inner wall of the mounting ring (1). A second fixing piece (10) is slidably connected to the top of the inner wall of the mounting ring (1). A plurality of first connecting holes (9) are provided on the adjacent sides of the first fixing piece (8) and the second fixing piece (10). A plurality of second connecting holes (15) are provided on the top periphery of the fixing ring (7). Connecting bolts (12) are threadedly connected to the interiors of the first connecting holes (9). The bottom ends of the connecting bolts (12) penetrate through the inner walls of the second connecting holes (15) and are threadedly connected to nuts two (13). A sealing mechanism (2) is provided inside the mounting ring (1).

2. The disc-shaped gear milling cutter according to claim 1, characterized in that: The sealing mechanism (2) includes a plurality of bolts (202). A plurality of screw holes (201) are provided on the top periphery of the fixing ring (7). The bottom ends of the plurality of bolts (202) are threadedly connected to the interiors of the screw holes (201). A screw head (203) is fixedly connected to the top end of the bolt (202). A mounting groove (205) is provided on the outer wall of the screw head (203). A first sealing ring (206) is fixedly connected to the interior of the mounting groove (205). A nut one (207) is threadedly connected to the bottom end of the bolt (202). A second sealing ring (208) is fixedly connected to the outer wall of the nut one (207).

3. The disk-shaped gear milling cutter according to claim 2, characterized in that: The sealing mechanism (2) further includes a plum blossom groove (204). The bottom of the plum blossom groove (204) is provided on the top of the screw head (203). The outer wall of the first sealing ring (206) is disposed on the inner wall of the second fixing piece (10).

4. The disc-shaped gear milling cutter according to claim 1, wherein: A wear-resistant layer (11) is provided on the inner wall of the fixing ring (7). The blade (3) and the mounting ring (1) are integrally designed.

5. The disc-shaped gear milling cutter according to claim 1, wherein: A limiting groove (14) is provided on the inner wall of the fixing ring (7). The outer wall of the fixing ring (7) is made smooth.

6. The disc-shaped gear milling cutter according to claim 1, characterized in that: A wear-resistant outer layer (16) is provided on the outer wall of the blade (3). A hardness enhancement layer (17) is provided inside the wear-resistant outer layer (16).

7. The disc-shaped gear milling cutter according to claim 6, characterized in that: A toughness transition layer (18) is provided inside the hardness enhancement layer (17). A base core layer (19) is provided inside the toughness transition layer (18).

8. The disc-shaped gear milling cutter according to claim 1, characterized in that: The inner diameter size of the first connecting hole (9) is adapted to the diameter size of the connecting bolt (12). The plurality of first connecting holes (9) are all symmetrically designed.

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