A type of casing section milling cutter

Abstract

This utility model discloses a sleeve segment milling cutter, relating to the field of sleeve segment milling technology, and solves the technical problems of low service life and low chip removal efficiency of existing segment milling cutters, which lead to a decline in overall performance. This utility model includes a cutter body and a cutter head, the cutter head being disposed on the cutter body. The cutter head includes at least one sub-cutter head, and a mounting platform is provided between two adjacent sub-cutter heads or between the sub-cutter head and the cutter body. The sidewall of the sub-cutter head has a lateral tilting portion along the length direction of the cutter body, and a segment milling component is mounted on the lateral tilting portion. The segment milling component is supported on the mounting platform. This utility model has the advantages of high segment milling efficiency and good performance.

Description

Technical Field

[0001] This utility model belongs to the field of sleeve section milling technology, and specifically relates to a sleeve section milling cutter. Background Technology

[0002] Casing section milling is a key technology in oil and gas drilling operations. It is mainly used to precisely mill a section of annular area off the casing string that has been run into the wellbore to form a casing-free window or open hole section, creating a passage for subsequent operations. The casing section milling cutter is the main component of the casing section milling device, and its main function is to cut and mill the casing.

[0003] Due to the high-frequency cutting of the casing section milling cutter, the milling cutter itself is subjected to large forces, which easily leads to accelerated tool wear. In addition, the large amount of heat generated during cutting will further exacerbate tool wear. Furthermore, the milling cutter is prone to breakage under complex loads during downhole section milling, resulting in section milling failure and reducing the efficiency of section milling operations. Utility Model Content

[0004] In view of this, the present invention aims to provide a sleeve section milling cutter to solve the technical problems of low service life and low chip removal efficiency of existing section milling cutters, which lead to a decline in overall performance.

[0005] To solve the aforementioned technical problems, the present invention adopts the following technical solution: A casing section end mill includes a cutter body and a cutter head. The cutting head is disposed on the cutting body. The cutting head includes at least one sub-cutting head. A mounting platform is provided between two adjacent sub-cutting heads or between the sub-cutting head and the cutting body. The side wall of the sub-cutting head is provided with a lateral tilting portion along the length direction of the cutting body. A segment milling component is mounted on the lateral tilting portion and the segment milling component is supported on the mounting platform.

[0006] In this utility model, the segment milling component plays the main segment milling role. The lower end and one side wall of the segment milling component are respectively connected to the mounting platform and the side tilting part, which supports both sides of the segment milling component, increases the contact area between the cutter head and the segment milling component, and allows the load on the segment milling component during segment milling to be transferred to the cutter head and the cutter body, so that the load can be distributed, which is beneficial to improving the service life of the segment milling component and the cutter head. In addition, the side tilt section is more conducive to chip removal, preventing chips from accumulating at the cutter head or even wrapping around the cutting edge, which would affect the segment milling.

[0007] Preferably, the cutting head includes a first sub-cutting head, a second sub-cutting head, and a third sub-cutting head, which are arranged sequentially from top to bottom, and the third sub-cutting head is connected to the cutting body. The mounting platform includes a first mounting platform, a second mounting platform, and a third mounting platform. The first sub-cutting head and the second sub-cutting head, the second sub-cutting head and the third sub-cutting head, and the third sub-cutting head and the cutter body are respectively provided with the first mounting platform, the second mounting platform, and the third mounting platform form angles α1, α2, and α3 with the horizontal plane, respectively.

[0008] After adopting this technical solution, it should be noted that the first, second, and third sub-cutting heads form a three-stage step, which enables the segment milling parts set on the first, second, and third mounting platforms to form a three-stage progressive segment milling. The segment milling part set on the first mounting platform plays the role of contacting and segment milling the sleeve first, and then the segment milling parts on the second and third mounting platforms perform segment milling in sequence. Through progressive segment milling, the thickness of the sleeve cut each time is thinner, which helps to reduce the vibration and cutting force of the cutting head and the cutting body, thereby increasing the segment milling efficiency, and also helps the cutting head to dissipate heat and improve the service life of the cutting head. Furthermore, the purpose of α1, α2, and α3 here is to make the segment milling part tilted after installation, so that the cutting edge of the segment milling part can better mill the sleeve.

[0009] Preferably, the second sub-cutting head and the third sub-cutting head are provided with multiple tilting sections on their sidewalls. The multiple tilting sections make the second sub-cutting head and the third sub-cutting head form a tooth shape, and the tilting sections on the sidewalls of the second sub-cutting head and the third sub-cutting head correspond to each other.

[0010] After adopting this technical solution, it should be noted that the lateral tilting section gradually tilts inwards from left to right along the length of the cutter body towards the corresponding cutter head. A significant misalignment is formed between two adjacent tilting sections on the same cutter head in the thickness direction. Specifically, the cross-sectional thickness at the end (right end) of the first tilting section is lower than the cross-sectional thickness at the front end (left end) of the second tilting section, thus creating a misalignment. When there are multiple tilting sections, the cutter head appears toothed. This design serves two purposes: firstly, because of the misalignment between adjacent tilting sections on the same cutter head, chips can pass through the space created by this misalignment quickly. On the one hand, this design allows the segment milling parts with inclined sections at different positions on the same cutter head to ultimately form a progressive segment milling structure. This, in conjunction with the progressive segment milling structure formed by the first, second, and third sub-cutter heads mentioned above, enables efficient sleeve segment milling and helps reduce the torque of the segment milling, thereby increasing the lifespan of the segment milling parts and the cutter head. Furthermore, it should be noted that progressive segment milling produces shorter and more easily broken chips because the cutting material is thinner. Therefore, when combined with the multi-segment inclined sections for easy chip removal, it can further increase the lifespan of the cutter head and the segment milling parts.

[0011] Preferably, the lateral tilting portion is further provided with an inward tilting portion along the vertical direction, and the first mounting platform, the second mounting platform and the third mounting platform respectively form a first mounting angle, a second mounting angle and a third mounting angle with the adjacent inward tilting portion.

[0012] After adopting this technical solution, it should be noted that, taking the first sub-cutting head as an example, the first sub-cutting head has a side tilting part on its side, and an inward tilting part on the basis of the side tilting part. The inward tilting part is inclined from top to bottom inward towards the first sub-cutting head along the height direction of the side tilting part, so that the thickness of the upper end of the first sub-cutting head is greater than the thickness of the lower end. Therefore, when the segment milling part is installed at the first mounting angle, that is, the lower end of the segment milling part is connected to the first mounting platform and the rear end is connected to the inward tilting part of the first sub-cutting head, an inward tilting angle with the same angle is formed at the front end of the segment milling part. On the one hand, the cutting edge of the segment milling part can contact the sleeve, and on the other hand, chip removal can be performed, which is conducive to increasing the service life of the segment milling part and the cutting head.

[0013] Preferably, the sidewall of the first sub-blade head is also provided with multiple tilting sections, and the multiple tilting sections make the first sub-blade head form a tooth shape.

[0014] After adopting this technical solution, it should be noted that by setting multiple inclined sections on the side wall of the first sub-cutting head, the chip removal capability is further enhanced. The purpose is the same as that of the multiple inclined sections set on the second and third sub-cutting heads mentioned above, and will not be repeated here.

[0015] Preferably, the tilt angle γ is 3° to balance chip removal and the load-bearing capacity of the cutter head.

[0016] Preferably, α1, α2, and α3 are 19°, 22°, and 25°, respectively.

[0017] Preferably, the mounting angle β is 90°.

[0018] After adopting this technical solution, it should be noted that the β angle is set to fit the segment milling part so that the segment milling part fits more closely to both sides of the mounting angle, namely the mounting table surface and the incline surface, thereby making the force transmission more uniform and the support effect better. The sizes of angles α1, α2, and α3 reflect the service life of the cutter head. Specifically, taking α1 as an example, since the β angle is a fixed value of 90°, the smaller the angle of α1, the more vertical the segment milling part is after installation. The larger the contact area between the front end and the sleeve during cutting, the greater the resistance and the lower the cutting efficiency. On the other hand, the larger the angle of α1, the smaller and then larger the contact area between the tip of the segment milling part and the sleeve will be, and it may even make the front end of the segment milling part perpendicular to the inner wall of the sleeve. This will easily accelerate the wear of the front end of the segment milling part and reduce its service life. Therefore, if the angle of α1 is too large or too small, it will affect the contact area with the sleeve and cause torque changes. The greater the torque, the greater the resistance on the cutter body. Therefore, in this solution, α1, α2, and α3 are 19°, 22°, and 25°, respectively.

[0019] Preferably, the segment milling part includes a four-cornered alloy block and an octagonal alloy block, the octagonal alloy block is provided on the side wall of the first sub-cutter head, and the four-cornered alloy block is provided on the side walls of the second sub-cutter head and the third sub-cutter head.

[0020] After adopting this technical solution, it should be noted that the alloy block can strengthen the strength of the cutter head, improve its service life and cutting efficiency. In addition, an octagonal alloy is set on the top-level first-stage cutter head because the octagonal alloy has more sharp corners, which reduces the resistance when cutting into the sleeve and mainly plays the role of cutting in. On the second-stage and third-stage cutter heads, a square alloy is set, which mainly plays the role of segment milling.

[0021] Preferably, the blade body has a first connecting part and a second connecting part at both ends.

[0022] After adopting this technical solution, it should be noted that the cutter body is connected to the sleeve section milling device through the first connecting part and the second connecting part.

[0023] The segment milling process of this utility model: The octagonal alloy on the first cutting head first contacts the sleeve wall and cuts the sleeve. The four-cornered alloy blocks on the second and third cutting heads then progressively cut the sleeve. During this process, the chips generated are discharged along the inward and side-tilted parts to prevent them from affecting the alloy blocks and to extend their service life.

[0024] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are: 1. The sleeve section milling cutter provided by this utility model has a toothed cutter head with multiple cutter heads, which is conducive to guiding the chip discharge. In addition, the multiple cutter heads can be evenly distributed on the cutting force generated during the cutting process. The multiple cutter heads can be gradually connected into the sleeve, which helps to enhance the cutting efficiency and extend the cutter head life.

[0025] 2. The sleeve section milling cutter provided by this utility model can enhance the strength of the cutter head, improve its service life and cutting efficiency by setting an octagonal alloy block on the first-stage cutter head and a quadrangular alloy block on the second-stage and third-stage cutter heads.

[0026] 3. The sleeve section milling cutter provided by this utility model, by setting an inclination angle and setting a side tilting part and an inclination part on the cutter head, during the cutting process, the inclination angle and the inclined cutter head cooperate to further enhance the chip removal effect. In addition, the inclination angle makes each stage of the cutter head form a tooth shape in the transverse direction, thereby improving the cutting efficiency.

[0027] 4. The sleeve section milling cutter provided by this utility model, by setting a second stop, restricts the movement of the cutter body as it moves upward along the first guide groove, thereby preventing the cutter body from falling off. Attached Figure Description

[0028] This utility model will be described by way of example and with reference to the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the structure of the present invention after the segment milling part is installed; Figure 3 This is a top view of the present invention; Figure 4 This utility model Figure 3 Sectional view along line AA; Figure 5 This utility model Figure 3 Sectional view along line AA; Figure 6 This is a schematic diagram of another embodiment of the present invention.

[0029] Figure label: 1-Cutter body, 2-Cutter head, 201-First sub-cutter head, 202-Second sub-cutter head, 203-Third sub-cutter head, 3-First alloy block, 4-Second alloy block, 5-First connecting part, 6-Second connecting part, 7-Mounting platform, 8-Inward tilting part, 9-Side tilting part. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the embodiments and accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The components of the embodiments of this application described and marked in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0031] In the description of the embodiments of this application, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility product is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] The following is combined with Figures 1-6 This utility model will be described in detail. Example 1

[0033] A type of casing section milling cutter, such as Figure 1 , Figure 2 As shown, it includes a blade body 1 and a blade head 2. The cutter head 2 is disposed on the cutter body 1. The cutter head 2 includes at least one sub-cutter head 2. A mounting platform 7 is provided between two adjacent sub-cutter heads 2 or between the sub-cutter head 2 and the cutter body 1. The side wall of the sub-cutter head 2 is provided with a side tilting part 9 along the length direction of the cutter body 1. A segment milling part is mounted on the side tilting part 9. The segment milling part is supported on the mounting platform 7.

[0034] The blade body 1 is provided with a first connecting part 5 and a second connecting part 6 at both ends.

[0035] In this embodiment, the cutter body 1 is connected to the sleeve segment milling device through the first connecting part 5 and the second connecting part 6. The segment milling component plays the main segment milling role. The lower end and one side wall of the segment milling component are respectively connected to the mounting platform 7 and the tilting part 9, which support both sides of the segment milling component and increase the contact area between the cutter head 2 and the segment milling component. This allows the load on the segment milling component during segment milling to be transferred to the cutter head 2 and the cutter body 1, so that the load can be distributed, which is beneficial to improving the service life of the segment milling component and the cutter head 2. In addition, the tilting part 9 is more conducive to chip removal and prevents chips from accumulating at the cutter head 2 or even wrapping around the cutting edge, affecting segment milling. Example 2

[0036] The difference between this embodiment and Embodiment 1 is that, as Figure 1 As shown, the cutter head 2 includes a first sub-cutter head 201, a second sub-cutter head 202, and a third sub-cutter head 203, which are arranged sequentially from top to bottom, and the third sub-cutter head 203 is connected to the cutter body 1. The mounting platform 7 includes a first mounting platform 701, a second mounting platform 702, and a third mounting platform 703. The first sub-cutting head 201 is provided with the first mounting platform 701, the second sub-cutting head 202, and the third sub-cutting head 203, and the third sub-cutting head 203 is provided with the cutter body 1. The first mounting platform 701, the second mounting platform 702, and the third mounting platform 703 form angles α1, α2, and α3 with the horizontal plane, respectively.

[0037] In this embodiment, the first sub-cutting head 201, the second sub-cutting head 202, and the third sub-cutting head 203 form a three-stage step, thereby enabling the segment milling components mounted on the first mounting platform 701, the second mounting platform 702, and the third mounting platform 703 to perform a three-stage progressive segment milling. The segment milling component mounted on the first mounting platform 701 is responsible for contacting and segment milling the sleeve first, and then the segment milling components on the second mounting platform 702 and the third mounting platform 703 perform segment milling in sequence. Through progressive segment milling, the thickness of the sleeve cut each time is thinner, which helps to reduce the vibration and cutting force of the cutting head 2 and the cutter body 1, thereby increasing the segment milling efficiency and facilitating heat dissipation of the cutting head 2, thus improving the service life of the cutting head 2. In addition, the purpose of α1, α2, and α3 here is to make the segment milling components tilted after installation, so that the cutting edge of the segment milling components can better segment mill the sleeve. Example 3

[0038] The difference between this embodiment and Embodiment 2 is that, as follows Figure 3 As shown, the second sub-cutting head 202 and the third sub-cutting head 203 are respectively provided with multiple tilting sections 9 on their sidewalls. The multiple tilting sections 9 make the second sub-cutting head 202 and the third sub-cutting head 203 form a tooth shape, and the positions of the tilting sections 9 on the sidewalls of the second sub-cutting head 202 and the third sub-cutting head 203 correspond to each other.

[0039] In this embodiment, the tilting part 9 gradually tilts inward from left to right along the length of the cutter body 1 towards the interior of the corresponding cutter head 2. A significant misalignment is formed between two adjacent tilting parts on the same cutter head 2 in the thickness direction of the cutter head 2. Specifically, the cross-sectional thickness at the end (right end) of the first tilting part is lower than the cross-sectional thickness at the front end (left end) of the second tilting part, thus forming a misalignment. When there are multiple tilting parts, the cutter head 2 presents a tooth shape. This setting has two purposes: first, because the adjacent two tilting parts on the same cutter head 2 form a misalignment, the chips can be quickly discharged through the space formed by this misalignment. On the other hand, this arrangement allows the segment milling parts with inclined sections at different positions on the same cutter head 2 to ultimately form a progressive segment milling structure. The progressive segment milling structure formed by the first sub-cutter head 201, the second sub-cutter head 202, and the third sub-cutter head 203 works together to achieve efficient sleeve segment milling and helps to reduce the torque of the segment milling, thereby increasing the lifespan of the segment milling parts and the cutter head 2. In addition, it should be noted that because progressive segment milling cuts thinner materials, the chips it produces are shorter and easier to break. Therefore, when combined with the multi-segment inclined section 9 for easy chip removal, it can further increase the lifespan of the cutter head 2 and the segment milling parts. Example 4

[0040] The difference between this embodiment and embodiment 3 is that, as Figure 4 , Figure 5 As shown, the tilting part 9 is also provided with an inward tilting part 8 along the vertical direction, and the first mounting platform 701, the second mounting platform 702 and the third mounting platform 703 form a first mounting angle, a second mounting angle and a third mounting angle with the adjacent inward tilting part 8, respectively.

[0041] In this embodiment, taking the first sub-cutting head 201 as an example, the first sub-cutting head 201 has a side tilting part 9 on its side. Based on the side tilting part 9, an inward tilting part 8 is provided. The inward tilting part 8 is inclined from top to bottom in the height direction of the side tilting part 9 towards the first sub-cutting head 201, thereby making the upper end thickness of the first sub-cutting head 201 greater than the lower end thickness. Therefore, when the segment milling part is installed at the first mounting angle, that is, the lower end of the segment milling part is connected to the first mounting platform 701 and the rear end is connected to the inward tilting part 8 of the first sub-cutting head 201, an inward tilting angle with the same angle is formed at the front end of the segment milling part. On the one hand, the cutting edge of the segment milling part can contact the sleeve, and on the other hand, chip removal can be performed, which is conducive to increasing the service life of the segment milling part and the cutting head 2. Example 5

[0042] The difference between this embodiment and embodiment 4 is that, as Figure 6 As shown, the first sub-blade 201 also has multiple tilting sections 9 on its sidewall, and the multiple tilting sections 9 make the first sub-blade 201 form a tooth shape.

[0043] In this embodiment, by providing multiple inclined sections 9 on the side wall of the first sub-cutting head 201, the chip removal capability is further enhanced. The purpose is the same as that of the multiple inclined sections provided on the second sub-cutting head 202 and the third sub-cutting head 203, which will not be described in detail here. Example 6

[0044] The difference between this embodiment and embodiments 1-5 is that the angle γ of the tilting part 9 is 3°, so as to balance chip removal and the load-bearing capacity of the cutter head 2.

[0045] The angles α1, α2, and α3 are 19°, 22°, and 25°, respectively.

[0046] The installation angle β is 90°.

[0047] In this embodiment, the β angle is set to fit the segment milling part so that the segment milling part fits more closely to both sides of the mounting angle, namely the surface of the mounting platform 7 and the surface of the incline 8, thereby making the force transmission more uniform and the support effect better. The sizes of angles α1, α2, and α3 reflect the service life of the cutter head 2. Specifically, taking α1 as an example, since the β angle is a fixed value of 90°, the smaller the angle of α1, the more vertical the segment milling part is after installation, the larger the contact area between the front end and the sleeve during cutting, the greater the resistance and the lower the cutting efficiency. On the other hand, the larger the angle of α1, the smaller and then larger the contact area between the tip of the segment milling part and the sleeve, and even make the front end of the segment milling part perpendicular to the inner wall of the sleeve, which easily leads to faster wear of the front end of the segment milling part and reduced service life. Therefore, if the angle of α1 is too large or too small, it will affect the contact area with the sleeve and cause torque changes. The larger the torque, the greater the resistance of the cutter body 1. Therefore, in this scheme, α1, α2, and α3 are 19°, 22°, and 25°, respectively.

[0048] In this embodiment, the inward tilting portions 8 of the first sub-cutting head 201, the second sub-cutting head 202, and the third sub-cutting head 303 and the vertical plane of the cutter body 701 respectively form forward tilting angles δ1, δ2, and δ3, and the angles δ1, δ2, and δ3 are consistent with the angles α1, α2, and α3. Example 7

[0049] The difference between this embodiment and embodiment 6 is that, as Figure 2 As shown, the segment milling part includes a quadrangular alloy block and an octagonal alloy block. The octagonal alloy block is provided on the side wall of the first sub-cutter head 201, and the quadrangular alloy block is provided on the side wall of the second sub-cutter head 202 and the third sub-cutter head 203.

[0050] In this embodiment, the alloy block can strengthen the strength of the cutter head 2, improve its service life and cutting efficiency. In addition, an octagonal alloy is set on the top-level first-stage cutter head 2 because the octagonal alloy has more sharp corners, which reduces the resistance when cutting into the sleeve and mainly plays the role of cutting in. On the second sub-cutter head 202 and the third sub-cutter head 203, a tetragonal alloy is set, which mainly plays the role of segment milling.

[0051] The segment milling process of this utility model: The octagonal alloy on the first sub-cutter head 201 first contacts the sleeve wall and cuts the sleeve. The quadrangular alloy blocks on the second sub-cutter head 202 and the third sub-cutter head 203 progressively cut the sleeve in sequence. During this process, the chips generated are discharged along the inward tilting part 8 and the side tilting part 9 to prevent them from affecting the alloy blocks and to extend their service life.

[0052] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A casing section milling cutter, characterized in that, It includes the blade body (1) and the blade tip (2). The cutter head (2) is disposed on the cutter body (1). The cutter head (2) includes at least one sub-cutter head (2). A mounting platform (7) is provided between two adjacent sub-cutter heads (2) or between the sub-cutter head (2) and the cutter body (1). The side wall of the sub-cutter head (2) is provided with a side tilting part (9) along the length direction of the cutter body (1). A segment milling part is mounted on the side tilting part (9). The segment milling part is supported on the mounting platform (7).

2. The sleeve section milling cutter according to claim 1, characterized in that, The cutting head (2) includes a first sub-cutting head (201), a second sub-cutting head (202), and a third sub-cutting head (203), which are arranged sequentially from top to bottom, and the third sub-cutting head (203) is connected to the cutting body (1). The mounting platform (7) includes a first mounting platform (7), a second mounting platform (7) and a third mounting platform (7). The first sub-cutting head (201) and the second sub-cutting head (202), the second sub-cutting head (202) and the third sub-cutting head (203), as well as the third sub-cutting head (203) and the cutter body (1) are respectively provided with the first mounting platform (7), the second mounting platform (7) and the third mounting platform (7). The first mounting platform (7), the second mounting platform (7) and the third mounting platform (7) form angles α1, α2 and α3 with the horizontal plane, respectively.

3. A sleeve section milling cutter according to claim 2, characterized in that, The second sub-cutter head (202) and the third sub-cutter head (203) are respectively provided with multiple tilting sections (9) on their sidewalls. The multiple tilting sections (9) make the second sub-cutter head (202) and the third sub-cutter head (203) form a tooth shape, and the tilting sections (9) on the sidewalls of the second sub-cutter head (202) and the third sub-cutter head (203) correspond to each other.

4. A sleeve section milling cutter according to claim 2, characterized in that, The tilting part (9) is also provided with an inward tilting part (8) along the vertical direction. The first mounting platform (7), the second mounting platform (7) and the third mounting platform (7) form a first mounting angle, a second mounting angle and a third mounting angle with the adjacent inward tilting part (8) respectively.

5. A sleeve section milling cutter according to claim 2, characterized in that, The first sub-cutting head (201) also has multiple tilting sections (9) on its sidewall, and the multiple tilting sections (9) make the first sub-cutting head (201) form a tooth shape.

6. A sleeve section milling cutter according to claim 2, characterized in that, The angle γ of the tilting part (9) is 3°.

7. A sleeve section milling cutter according to claim 2, characterized in that, The angles α1, α2, and α3 are 19°, 22°, and 25°, respectively.

8. A sleeve section milling cutter according to claim 4, characterized in that, The first mounting angle, the second mounting angle, and the third mounting angle are all β, and β has a value of 90°.

9. A sleeve section milling cutter according to claim 2, characterized in that, The segment milling part includes a quadrangular alloy block and an octagonal alloy block. The octagonal alloy block is provided on the side wall of the first sub-cutting head (201), and the quadrangular alloy block is provided on the side walls of the second sub-cutting head (202) and the third sub-cutting head (203).

10. A sleeve section milling cutter according to claim 2, characterized in that, The blade body (1) has a first connecting part (5) and a second connecting part (6) at both ends.

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